{"id":14776,"date":"2026-04-22T16:19:53","date_gmt":"2026-04-22T08:19:53","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=14776"},"modified":"2026-06-25T10:05:23","modified_gmt":"2026-06-25T02:05:23","slug":"440c-stainless-steel-heat-treatment","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/440c-stainless-steel-heat-treatment\/","title":{"rendered":"440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \uc5f4\ucc98\ub9ac \uac00\uc774\ub4dc | \uacf5\uc815, \uacbd\ub3c4 \ubc0f \uace0\uc7a5"},"content":{"rendered":"<section class=\"aobo-440c-heat-treatment-page\">\n  <style>\n    .aobo-440c-heat-treatment-page {\n      --aobo-blue: #0c56d0;\n      --aobo-blue-dark: #073b8e;\n      --aobo-blue-soft: #eaf2ff;\n      --aobo-border: #d7e5fb;\n      --aobo-text: #203044;\n      --aobo-muted: #617087;\n      --aobo-orange: #f59b23;\n      --aobo-white: #ffffff;\n      --aobo-shadow: 0 18px 45px rgba(12, 86, 208, 0.10);\n      --aobo-page-width: 1180px;\n      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12px;\n      padding: 6px 12px;\n      border-radius: 999px;\n      background: #fff7ed;\n      border: 1px solid #fde3bd;\n      color: var(--aobo-orange);\n      font-size: 14px;\n      font-weight: 700;\n      position: relative;\n      z-index: 2;\n    }\n\n    .aobo-hero h1 {\n      margin: 0 0 16px;\n      color: #082d6f;\n      font-size: clamp(34px, 4vw, 54px);\n      line-height: 1.06;\n      letter-spacing: 0;\n      position: relative;\n      z-index: 2;\n    }\n\n    .aobo-hero p {\n      max-width: 940px;\n      margin: 0 0 12px;\n      font-size: 17px;\n      color: #314158;\n      position: relative;\n      z-index: 2;\n    }\n\n    .aobo-hero p:last-child {\n      margin-bottom: 0;\n    }\n\n    .aobo-article {\n      max-width: var(--aobo-page-width);\n      margin: 0 auto;\n    }\n\n    .aobo-article h2 {\n      margin: 44px 0 16px;\n      color: #082d6f;\n      font-size: 30px;\n      line-height: 1.25;\n      letter-spacing: 0;\n    }\n\n    .aobo-article h3 {\n     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!important;\n    }\n\n    @media (max-width: 760px) {\n      .aobo-hero {\n        padding: 30px 22px;\n        border-radius: 22px;\n      }\n\n      .aobo-article h2 {\n        font-size: 25px;\n      }\n\n      .aobo-article h3 {\n        font-size: 20px;\n      }\n\n      .aobo-final-cta {\n        padding: 26px 22px;\n        border-radius: 22px;\n      }\n\n      .aobo-cta-buttons {\n        width: 100%;\n        flex-direction: column;\n        align-items: stretch;\n      }\n\n      .aobo-supply-block {\n        grid-template-columns: 1fr;\n        gap: 18px;\n        padding: 20px;\n      }\n\n      .aobo-supply-image {\n        width: min(190px, 100%);\n        margin: 0 auto;\n      }\n\n      .aobo-supply-actions .aobo-btn {\n        width: 100%;\n      }\n\n      .aobo-related-pages {\n        padding: 24px 20px;\n      }\n\n      .aobo-related-grid {\n        grid-template-columns: 1fr;\n      }\n    }\n  <\/style>\n\n  <div class=\"aobo-wrap\">\n    <header class=\"aobo-hero\">\n      <span class=\"aobo-eyebrow\">440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \uc5f4\ucc98\ub9ac \uac00\uc774\ub4dc<\/span>\n      <h1>440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \uc5f4\ucc98\ub9ac \uac00\uc774\ub4dc<\/h1>\n      <p>\uc5f4\ucc98\ub9ac\ud558\ub2e4 <a href=\"https:\/\/aobosteel.com\/ko\/440c-stainless-steel\/\">440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15<\/a>, preheat the steel to reduce thermal stress, then austenitize at 1850\u20131950\u00b0F \/ 1008\u20131063\u00b0C. After soaking, quench in oil, air, or polymer, depending on section size and part geometry.<\/p>\n      <p>For precision parts, subzero treatment at -100\u00b0F \/ -73\u00b0C or lower helps reduce retained austenite and improve dimensional stability. Temper immediately after quenching or subzero treatment, usually below 800\u00b0F \/ 427\u00b0C, to maintain hardness and corrosion resistance.<\/p>\n      <p>Avoid tempering in the 800\u20131050\u00b0F \/ 427\u2013566\u00b0C range because it can reduce toughness and corrosion resistance.<\/p>\n    <\/header>\n\n    <main class=\"aobo-article\">\n      <section class=\"aobo-supply-block\" aria-label=\"440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \ubb38\uc758 \ubc0f \uc81c\ud488 \uc0c1\uc138 \uc815\ubcf4\">\n        <div class=\"aobo-supply-image\">\n          <img decoding=\"async\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/04\/440C.avif\" alt=\"Aobo Steel\uc5d0\uc11c \uacf5\uae09\ud558\ub294 440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15\" loading=\"lazy\">\n        <\/div>\n        <div class=\"aobo-supply-content\">\n          <h2>Need 440C stainless steel for machining before heat treatment?<\/h2>\n          <p>Aobo Steel supplies annealed 440C bar and plate to industrial buyers, ready for machining and customer heat treatment. Send your required size, quantity, surface condition, and destination port for a quote.<\/p>\n          <div class=\"aobo-supply-actions\">\n            <a class=\"aobo-btn aobo-btn-primary popmake-16052\" href=\"javascript:void(0);\">Request 440C Material Quote<\/a>\n            <a class=\"aobo-btn aobo-btn-secondary\" href=\"https:\/\/aobosteel.com\/ko\/440c-stainless-steel\/\">View 440C Supply Range<\/a>\n          <\/div>\n        <\/div>\n      <\/section>\n\n      <p>440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15\uc740 \ub192\uc740 \uacbd\ub3c4, \ub0b4\ub9c8\ubaa8\uc131 \ubc0f \ub0b4\uc2dd\uc131\uc758 \uade0\ud615\uc744 \uc815\ubc00\ud558\uac8c \ub9de\ucdb0\uc57c \ud558\ub294 \uace0\ud0c4\uc18c \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8\uacc4 \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15\uc785\ub2c8\ub2e4. \ucd5c\ub300 \uc57d 60 HRC\uc758 \uacbd\ub3c4\ub97c \ub2ec\uc131\ud560 \uc218 \uc788\uc9c0\ub9cc, \uc774\ub7ec\ud55c \uc131\ub2a5\uc740 \uc5f4\ucc98\ub9ac \uacf5\uc815\uc758 \uac01 \ub2e8\uacc4\ub97c \uc5c4\uaca9\ud558\uac8c \uc81c\uc5b4\ud560 \ub54c\ub9cc \uc548\uc815\uc801\uc73c\ub85c \uc720\uc9c0\ub429\ub2c8\ub2e4.<\/p>\n\n      <h2>440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \uc5f4\ucc98\ub9ac \uacf5\uc815 \uac1c\uc694<\/h2>\n      <p>440C\uc758 \uc5f4\ucc98\ub9ac \uacb0\uacfc\ub294 \uc5b4\ub2d0\ub9c1 \uc870\uac74, \uc608\uc5f4, \uc624\uc2a4\ud14c\ub098\uc774\uc9d5 \uc628\ub3c4, \uc720\uc9c0 \uc2dc\uac04, \ub2f4\uae08\uc9c8 \ubc29\ubc95, \uadf9\uc800\uc628 \ucc98\ub9ac, \ud15c\ud37c\ub9c1 \uc628\ub3c4 \ubc0f \ubd80\ud488 \ud615\uc0c1\uc5d0 \ub530\ub77c \ub2ec\ub77c\uc9d1\ub2c8\ub2e4.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr><th>\ud504\ub85c\uc138\uc2a4 \ub2e8\uacc4<\/th><th>\uc77c\ubc18\uc801\uc778 \ubc94\uc704 \ub610\ub294 \ubc29\ubc95<\/th><th>\ubaa9\uc801<\/th><th>\uc2e4\uc6a9\uc801\uc778 \ucc38\uace0 \uc0ac\ud56d<\/th><\/tr>\n          <\/thead>\n          <tbody>\n            <tr><td>\uc644\uc804 \uc5b4\ub2d0\ub9c1<\/td><td>1550\u20131600\u00b0F \/ 842\u2013870\u00b0C, slow furnace cool<\/td><td>\ubd80\ub4dc\ub7fd\uace0 \uac00\uacf5\ud558\uae30 \uc26c\uc6b4 \uad6c\uc870\ub97c \ub9cc\ub4e4\uc5b4\ub0c5\ub2c8\ub2e4.<\/td><td>Typical annealed hardness is about Rockwell B 92\u201397<\/td><\/tr>\n            <tr><td>\uacf5\uc815 \uc5b4\ub2d0\ub9c1<\/td><td>1250\u20131400\u00b0F \/ 676\u2013760\u00b0C, air cool<\/td><td>\uc911\uac04 \ub2e8\uacc4\uc758 \uc5f0\ud654 \ub610\ub294 \uc2a4\ud2b8\ub808\uc2a4 \ud574\uc18c<\/td><td>\uac00\uacf5, \uc131\ud615 \ub610\ub294 \uc7ac\uc791\uc5c5 \uc804\uc5d0 \uc720\uc6a9\ud569\ub2c8\ub2e4.<\/td><\/tr>\n            <tr><td>\uc608\uc5f4<\/td><td>About 1200\u00b0F \/ 650\u00b0C, sometimes 1400\u20131500\u00b0F \/ 760\u2013816\u00b0C<\/td><td>\uc5f4 \uad6c\ubc30 \ubc0f \uc751\ub825\uc744 \uc904\uc785\ub2c8\ub2e4.<\/td><td>\ubcf5\uc7a1\ud558\uac70\ub098 \ubcf5\uc7a1\ud55c \uad6c\uac04\uc5d0 \uc911\uc694\ud569\ub2c8\ub2e4.<\/td><\/tr>\n            <tr><td>\uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ud654<\/td><td>1850\u20131950\u00b0F \/ 1008\u20131063\u00b0C<\/td><td>\ud0c4\ud654\ubb3c \uc6a9\ud574 \ubc0f \uacbd\ud654 \ubc18\uc751 \uc81c\uc5b4<\/td><td>\uc77c\ubc18\uc801\uc73c\ub85c \ud3c9\ud615\ud654 \ud6c4 \uc57d 20\ubd84 \uc815\ub3c4 \ub2f4\uac00\ub461\ub2c8\ub2e4.<\/td><\/tr>\n            <tr><td>\ub2f4\uae08\uc9c8<\/td><td>\ub530\ub73b\ud55c \uc624\uc77c, \uacf5\uae30 \ub610\ub294 \ud3f4\ub9ac\uba38<\/td><td>\uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ub97c \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8\ub85c \ubcc0\ud658<\/td><td>\ub2e8\uba74 \ud06c\uae30, \ud615\uc0c1 \ubc0f \ubcc0\ud615 \uc704\ud5d8\ub3c4\ub97c \uae30\uc900\uc73c\ub85c \uc120\ud0dd\ud558\uc2ed\uc2dc\uc624.<\/td><\/tr>\n            <tr><td>\uc601\ud558\uc758 \ucc98\ub9ac<\/td><td>-100\u00b0F \/ -73\u00b0C or lower for at least two hours<\/td><td>\uc794\ub958 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ub97c \uac10\uc18c\uc2dc\ud0a4\uc2ed\uc2dc\uc624.<\/td><td>\uc815\ubc00 \ubd80\ud488\uc5d0 \uc801\ud569\ud569\ub2c8\ub2e4.<\/td><\/tr>\n            <tr><td>\ub2f4\uae08\uc9c8<\/td><td>Usually below 800\u00b0F \/ 427\u00b0C<\/td><td>\uc2a4\ud2b8\ub808\uc2a4\ub97c \ud574\uc18c\ud558\uace0 \ucd5c\uc885 \uc18d\uc131\uc744 \uc124\uc815\ud558\uc138\uc694<\/td><td>\ub2f4\uae08\uc9c8 \ub610\ub294 \uadf9\uc800\uc628 \ucc98\ub9ac \uc9c1\ud6c4\uc5d0 \ud15c\ud37c\ub9c1\uc744 \ud558\uc2ed\uc2dc\uc624.<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <h2>440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \uc5f4\ucc98\ub9ac \ubc29\ubc95 (\ub2e8\uacc4\ubcc4 \uc124\uba85)<\/h2>\n      <p>440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15\uc758 \uc8fc\uc694 \uc5f4\ucc98\ub9ac \uc21c\uc11c\ub294 \uc5f0\ud654\uac00 \ud544\uc694\ud55c \uacbd\uc6b0 \uc5b4\ub2d0\ub9c1\uc744 \ud3ec\ud568\ud558\uace0, \uadf8 \ud6c4 \uc608\uc5f4, \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ud654, \ub2f4\uae08\uc9c8, \uc120\ud0dd\uc801\uc73c\ub85c \uadf9\uc800\uc628 \ucc98\ub9ac \ubc0f \ud15c\ud37c\ub9c1\uc744 \uac70\uce69\ub2c8\ub2e4.<\/p>\n\n      <h3>1\ub2e8\uacc4: 440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15\uc744 \uc5f4\ucc98\ub9ac\ud569\ub2c8\ub2e4.<\/h3>\n      <p>The process often begins with annealing to produce a soft, machinable structure. Full annealing is typically carried out at 1550\u20131600\u00b0F \/ 842\u2013870\u00b0C, followed by slow furnace cooling at a controlled rate. This usually results in an annealed hardness of approximately Rockwell B 92\u201397.<\/p>\n      <p>For intermediate softening or stress relief, process annealing at 1250\u20131400\u00b0F \/ 676\u2013760\u00b0C with air cooling may be applied. This stage helps ensure that machining and forming operations can be completed without excessive tool wear or cracking.<\/p>\n\n      <h3>2\ub2e8\uacc4: \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15\uc744 440\u00b0C\ub85c \uc608\uc5f4 \ubc0f \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ud654<\/h3>\n      <p>Because of its high alloy content and low thermal conductivity, 440C is highly sensitive to thermal gradients. Preheating to approximately 1200\u00b0F \/ 650\u00b0C, or in some cases up to 1400\u20131500\u00b0F \/ 760\u2013816\u00b0C, helps equalize internal temperatures and reduce thermal stress.<\/p>\n      <p>The steel is then heated to the austenitizing range of 1850\u20131950\u00b0F \/ 1008\u20131063\u00b0C, typically with a soak time of around 20 minutes. This stage determines carbide dissolution and the carbon content of the austenite, both of which directly control hardness and corrosion resistance.<\/p>\n      <p>Higher temperatures up to 2000\u00b0F \/ 1095\u00b0C may improve corrosion resistance, but overheating can cause grain coarsening and reduced toughness.<\/p>\n\n      <h3>3\ub2e8\uacc4: 440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \ub2f4\uae08\uc9c8<\/h3>\n      <p>\uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ud654 \ucc98\ub9ac \ud6c4, 440C \uac15\uc740 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ub97c \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8\ub85c \ubcc0\ud0dc\uc2dc\ud0a4\uae30 \uc704\ud574 \uae09\uc18d \ub0c9\uac01\ud574\uc57c \ud569\ub2c8\ub2e4. \ub0c9\uac01 \ubc29\ubc95\uc5d0\ub294 \ub2e8\uba74 \ud06c\uae30\uc640 \ud615\uc0c1\uc5d0 \ub530\ub77c \ub530\ub73b\ud55c \uc624\uc77c, \uacf5\uae30 \ub610\ub294 \uace0\ubd84\uc790 \ub2f4\uae08\uc9c8\uc81c\uac00 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr><th>\ub2f4\uae08\uc9c8 \ubc29\ubc95<\/th><th>\ucd5c\uc801\uc758 \uc0ac\uc6a9 \uc6a9\ub3c4\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/th><th>\uc774\uc810<\/th><th>\uc8fc\uc758<\/th><\/tr>\n          <\/thead>\n          <tbody>\n            <tr><td>\ub530\ub73b\ud55c \uc624\uc77c \ub2f4\uae08\uc9c8<\/td><td>\ub450\uaebc\uc6b4 \ubd80\ubd84 \ub610\ub294 \uc644\uc804\ud55c \uacbd\ub3c4\uac00 \uc694\uad6c\ub418\ub294 \ubd80\ud488<\/td><td>\uac15\ub825\ud55c \ub0c9\uac01 \ubc18\uc751<\/td><td>\ubcc0\ud615 \ubc0f \uade0\uc5f4 \uc704\ud5d8 \uc99d\uac00<\/td><\/tr>\n            <tr><td>\uacf5\ub7ad\uc2dd<\/td><td>\uc587\uac70\ub098 \ubcf5\uc7a1\ud558\uac70\ub098 \uc815\ubc00\ud55c \ubd80\ud488<\/td><td>\uc65c\uace1 \uc704\ud5d8 \uac10\uc18c<\/td><td>\uc77c\ubd80 \uad6c\uac04\uc5d0\uc11c\ub294 \uc18d\ub3c4\uac00 \ub108\ubb34 \ub290\ub9b4 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td><\/tr>\n            <tr><td>\ud3f4\ub9ac\uba38 \ud01c\uce6d<\/td><td>\uc81c\uc5b4 \ub0c9\uac01 \uc751\uc6a9 \ubd84\uc57c<\/td><td>\uc870\uc808 \uac00\ub2a5\ud55c \ub0c9\uac01 \uac15\ub3c4<\/td><td>\ub6f0\uc5b4\ub09c \uc9d1\uc911\ub825\uacfc \uacf5\uc815 \uad00\ub9ac \ub2a5\ub825\uc774 \uc694\uad6c\ub429\ub2c8\ub2e4.<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>Heavy sections typically require oil quenching to achieve full hardness, while thinner or more complex parts are often air-cooled to minimize distortion and cracking. Despite proper quenching, retained austenite can remain at 20\u201330%, potentially leading to instability in service.<\/p>\n\n      <h3>4\ub2e8\uacc4: \uc548\uc815\uc131\uc774 \uc911\uc694\ud560 \uacbd\uc6b0 \uc601\ud558 \uc628\ub3c4 \ucc98\ub9ac\ub97c \uc801\uc6a9\ud558\uc2ed\uc2dc\uc624.<\/h3>\n      <p>To stabilize the microstructure, subzero or cryogenic treatment is frequently applied immediately after quenching. Cooling the 440C material to -100\u00b0F \/ -73\u00b0C or lower for at least two hours promotes the transformation of retained austenite into martensite.<\/p>\n      <p>\uc774 \uacf5\uc815\uc740 \ud2b9\ud788 \ubca0\uc5b4\ub9c1\uc774\ub098 \uac8c\uc774\uc9c0\uc640 \uac19\uc740 \uc815\ubc00 \ubd80\ud488\uc758 \uce58\uc218 \uc548\uc815\uc131\uacfc \uacbd\ub3c4 \uade0\uc77c\uc131\uc744 \ud06c\uac8c \ud5a5\uc0c1\uc2dc\ud0b5\ub2c8\ub2e4.<\/p>\n\n      <h3>5\ub2e8\uacc4: 440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \uc5f4\ucc98\ub9ac<\/h3>\n      <p>\ub2f4\uae08\uc9c8 \ub610\ub294 \uadf9\uc800\uc628 \ucc98\ub9ac \uc9c1\ud6c4\uc5d0 \ud15c\ud37c\ub9c1\uc744 \uc2e4\uc2dc\ud574\uc57c \ud569\ub2c8\ub2e4. \ud15c\ud37c\ub9c1\uc758 \ubaa9\uc801\uc740 \ub0b4\ubd80 \uc751\ub825\uc744 \ud574\uc18c\ud558\uace0 \uacbd\ub3c4\uc640 \uc778\uc131 \uc0ac\uc774\uc758 \uc548\uc815\uc801\uc778 \uade0\ud615\uc744 \ud655\ub9bd\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uadf9\uc800\uc628 \ucc98\ub9ac\ub97c \uc801\uc6a9\ud558\ub294 \uacbd\uc6b0, \uc0c8\ub85c \ud615\uc131\ub41c \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8\ub97c \uc548\uc815\ud654\ud558\uae30 \uc704\ud574 \uc774\uc911 \ud15c\ud37c\ub9c1\uc774 \ud544\uc218\uc801\uc785\ub2c8\ub2e4.<\/p>\n      <p>For optimal corrosion resistance, tempering temperatures are generally kept below 800\u00b0F \/ 427\u00b0C.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr><th>\ud15c\ud37c\ub9c1 \uc628\ub3c4<\/th><th>\ub300\ub7b5\uc801\uc778 \uacbd\ub3c4<\/th><th>\uc2e4\uc9c8\uc801\uc778 \uc758\ubbf8<\/th><\/tr>\n          <\/thead>\n          <tbody>\n            <tr><td>325\u00b0F \/ 163\u00b0C<\/td><td>\ucd5c\uc18c 58 HRC \uc815\ub3c4<\/td><td>\ub192\uc740 \uacbd\ub3c4\uc640 \ub0b4\uc2dd\uc131<\/td><\/tr>\n            <tr><td>450\u00b0F \/ 232\u00b0C<\/td><td>\uc57d 55 HRC<\/td><td>\uc801\ub2f9\ud55c \uc751\ub825 \uc644\ud654\uc640 \ub192\uc740 \uacbd\ub3c4 \uc720\uc9c0<\/td><\/tr>\n            <tr><td>600\u00b0F \/ 316\u00b0C<\/td><td>\uc57d 57 HRC<\/td><td>\uacbd\ub3c4\ub294 \ub300\uac1c \uc774 \uc9c0\uc810 \uadfc\ucc98\uc5d0\uc11c \uc548\uc815\ud654\ub429\ub2c8\ub2e4.<\/td><\/tr>\n            <tr><td>800\u20131050\u00b0F \/ 427\u2013566\u00b0C<\/td><td>\uc77c\ubc18\uc801\uc73c\ub85c \ud53c\ud568<\/td><td>\ucda9\uaca9 \uac15\ub3c4 \ubc0f \ub0b4\uc2dd\uc131\uc744 \uc800\ud558\uc2dc\ud0ac \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>A critical limitation exists in the 800\u20131050\u00b0F \/ 427\u2013566\u00b0C range. Tempering within this range causes chromium carbide precipitation, significantly reducing both impact toughness and corrosion resistance. This temperature range must be strictly avoided in most applications.<\/p>\n\n      <h2>AMS-H-6875 and AMS 2759\/5 for 440C Heat Treatment<\/h2>\n      <p>When 440C is specified for aerospace or other regulated work, two SAE specifications are commonly referenced, and they apply at different stages of the supply chain. AMS-H-6875 covers the heat treatment of steel raw material, meaning the condition in which bar, plate, or forging stock is supplied. AMS 2759\/5 covers the heat treatment of finished martensitic corrosion-resistant steel parts, and it lists 440C within its scope alongside grades such as 410, 416, 420, 422, and 431.<\/p>\n      <p>The distinction matters because it separates the material supplier&#8217;s responsibility from the part processor&#8217;s. AMS-H-6875, the successor to the older MIL-H-6875, governs the delivered condition of the mill product, such as annealed bar ready for machining. It does not apply to finished parts. For those, it directs the user to the appropriate AMS 2759 slash specification. AMS 2759\/5 then governs the hardening cycle applied to the machined part, covering austenitizing, quenching, subzero treatment, and tempering, all carried out under the general requirements of AMS 2759 and the furnace pyrometry controls of AMS 2750.<\/p>\n      <p>In practice a 440C component passes through two documented stages. The material is produced and supplied in a certified condition, typically annealed, consistent with raw-material requirements. The finished part is then hardened by the customer or a qualified heat treater to AMS 2759\/5, with austenitizing, subzero, and tempering parameters selected to meet the specified hardness and the process controls that specification requires. The common confusion between the two specifications resolves to a simple rule: raw-material condition follows AMS-H-6875, and finished-part heat treatment follows AMS 2759\/5.<\/p>\n      <p>Aobo Steel supplies 440C as raw material for this route. It is provided in the annealed condition with a mill certificate covering chemical composition and heat-number traceability, ready for parts that will later be machined and hardened to AMS 2759\/5 by the customer or a qualified heat-treatment provider.<\/p>\n\n      <h2>440C \uac15\ucca0 \uc5f4\ucc98\ub9ac \uc2dc \ud754\ud788 \ubc1c\uc0dd\ud558\ub294 \ubb38\uc81c \ubc0f \uace0\uc7a5 \uc6d0\uc778<\/h2>\n      <p>440C\uc758 \uc131\ub2a5 \ud55c\uacc4\ub294 \uba85\ubaa9\uc0c1\uc758 \ubb3c\uc131\uce58\ub9cc\uc73c\ub85c \uacb0\uc815\ub418\ub294 \uac83\uc774 \uc544\ub2d9\ub2c8\ub2e4. \ub300\ubd80\ubd84\uc758 \uace0\uc7a5\uc740 \uc751\ub825 \ubd84\ud3ec, \uc0c1 \uc548\uc815\uc131 \ub610\ub294 \uacb0\uc815\ub9bd \uad6c\uc870\uc5d0 \uc9c1\uc811\uc801\uc778 \uc601\ud5a5\uc744 \ubbf8\uce58\ub294 \uacf5\uc815 \uc624\ub958\uc5d0\uc11c \ube44\ub86f\ub429\ub2c8\ub2e4.<\/p>\n\n      <h3>1. \uc5f4\uc751\ub825 \ubd88\uade0\ud615\uc73c\ub85c \uc778\ud55c \ub2f4\uae08\uc9c8 \uade0\uc5f4<\/h3>\n      <p>\uade0\uc5f4 \ubc0f \ubcc0\ud615\uc740 \uc77c\ubc18\uc801\uc73c\ub85c \uac00\uc5f4 \ub610\ub294 \ub2f4\uae08\uc9c8 \uc911 \uc81c\uc5b4\ub418\uc9c0 \uc54a\uc740 \uc5f4 \uad6c\ubc30\ub85c \uc778\ud574 \ubc1c\uc0dd\ud569\ub2c8\ub2e4. \ud45c\uba74\uacfc \uc911\uc2ec\ubd80\uc758 \uc628\ub3c4\uac00 \ud06c\uac8c \ub2e4\ub97c \uacbd\uc6b0, \uc5f4 \uc751\ub825\uacfc \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8 \ud33d\ucc3d\uc758 \ubcf5\ud569\uc801\uc778 \uc601\ud5a5\uc73c\ub85c \uc7ac\ub8cc\uc758 \uc778\uc7a5 \uac15\ub3c4\ub97c \ucd08\uacfc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n      <p>\uc774\ub7ec\ud55c \uc704\ud5d8\uc740 \ub450\uaed8\uac00 \uac00\ubcc0\uc801\uc774\uac70\ub098 \ubcf5\uc7a1\ud55c \ud615\uc0c1\uc744 \uac00\uc9c4 \ubd80\ubd84\uc5d0\uc11c \ud2b9\ud788 \uc2ec\uac01\ud569\ub2c8\ub2e4. \ubcc0\ud615\uc774 \uc77c\uc5b4\ub098\uae30 \uc804\uc5d0 \uc751\ub825\uc774 \ucd95\uc801\ub418\ub294 \uac83\uc744 \ubc29\uc9c0\ud558\uae30 \uc704\ud574\uc11c\ub294 \uc608\uc5f4\uacfc \uc81c\uc5b4\ub41c \uac00\uc5f4 \uc18d\ub3c4\uac00 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n\n      <h3>2. \ubd80\uc801\uc808\ud55c \uc5f4\ucc98\ub9ac\ub85c \uc778\ud55c \ucde8\uc131 \uc99d\uac00<\/h3>\n      <p>The most critical tempering limitation lies within the 800\u20131050\u00b0F \/ 427\u2013566\u00b0C range. Exposure to this range results in a sharp reduction in impact toughness and corrosion resistance due to carbide precipitation and grain-boundary effects.<\/p>\n      <p>\uadf8 \uacb0\uacfc, \uac89\ubcf4\uae30\uc5d0\ub294 \ub2e8\ub2e8\ud574 \ubcf4\uc774\uc9c0\ub9cc \uc2e4\uc81c \uc0ac\uc6a9 \ud658\uacbd\uc5d0\uc11c\ub294 \ucde8\uc131\uc774 \uac15\ud558\uace0 \ubd88\uc548\uc815\ud55c \uad6c\uc870\ub97c \uac16\uac8c \ub429\ub2c8\ub2e4. \ud2b9\uc815 \uac15\ub3c4 \ubaa9\ud45c\ub97c \ub2ec\uc131\ud558\uae30 \uc704\ud574 \uc774 \ubc94\uc704 \uadfc\ucc98\uc5d0\uc11c \ud15c\ud37c\ub9c1 \ucc98\ub9ac\uac00 \ud544\uc694\ud55c \uacbd\uc6b0\uc5d0\ub3c4, \ucda9\uaca9 \ud558\uc911\uc774\ub098 \ubd80\uc2dd\uc5d0 \ubbfc\uac10\ud55c \ud658\uacbd\uc740 \uc801\uc6a9 \ub300\uc0c1\uc5d0\uc11c \uc81c\uc678\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n      <h3>3. \uc794\ub958 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ub85c \uc778\ud55c \uce58\uc218 \ubd88\uc548\uc815\uc131<\/h3>\n      <p>Incomplete transformation during quenching can leave 20\u201330% retained austenite in the structure. This phase is metastable and may transform under stress or over time, producing fresh martensite with a higher specific volume.<\/p>\n      <p>\uc774\ub7ec\ud55c \uce58\uc218 \ubcc0\ud654\ub294 \uacf5\ucc28 \uc190\uc2e4, \ub0b4\ubd80 \uc751\ub825 \ucd95\uc801 \ubc0f \uc9c0\uc5f0 \uade0\uc5f4\ub85c \uc774\uc5b4\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc548\uc815\uc131\uc774 \uc694\uad6c\ub418\ub294 \ubd80\ud488\uc758 \uacbd\uc6b0, \uc774\ub7ec\ud55c \uc704\ud5d8\uc744 \uc904\uc774\uae30 \uc704\ud574 \uc601\ud558 \uc5f4\ucc98\ub9ac \ud6c4 \uc5ec\ub7ec \ucc28\ub840\uc758 \ud15c\ud37c\ub9c1 \uacf5\uc815\uc774 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n\n      <h3>4. \uacfc\uc5f4\uc740 \uc778\uc131\uc744 \uc800\ud558\uc2dc\ud0a4\uace0 \ubd88\uc548\uc815\uc131\uc744 \uc99d\uac00\uc2dc\ud0b5\ub2c8\ub2e4.<\/h3>\n      <p>\uad8c\uc7a5 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ud654 \uc628\ub3c4\ub97c \ucd08\uacfc\ud558\uba74 \ubcc0\ud0dc \ud3c9\ud615\uc774 \ubc14\ub01d\ub2c8\ub2e4. \uacfc\ub3c4\ud55c \ud0c4\ud654\ubb3c \uc6a9\ud574\ub294 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\uc5d0 \ud0c4\uc18c\ub97c \ud48d\ubd80\ud558\uac8c \ud558\uace0, \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8 \ubcc0\ud0dc \uc2dc\uc791 \uc628\ub3c4\ub97c \ub0ae\ucd94\uba70, \ub2f4\uae08\uc9c8 \ud6c4 \uc794\ub958 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ub7c9\uc744 \uc99d\uac00\uc2dc\ud0b5\ub2c8\ub2e4.<\/p>\n      <p>\ub3d9\uc2dc\uc5d0, \uacb0\uc815\ub9bd \uc870\ub300\ud654\ub294 \uc778\uc131\uc744 \uac10\uc18c\uc2dc\ud0a4\uace0 \uc785\uacc4 \ud30c\uad34 \ud604\uc0c1\uc744 \ucd09\uc9c4\ud569\ub2c8\ub2e4. \uc774\ub7ec\ud55c \ud604\uc0c1\uc774 \ubcf5\ud569\uc801\uc73c\ub85c \uc791\uc6a9\ud558\uc5ec \uc608\uc0c1\ubcf4\ub2e4 \ub0ae\uc740 \uacbd\ub3c4 \uc548\uc815\uc131\uc744 \ub098\ud0c0\ub0b4\uace0 \ucde8\uc131 \ud30c\uad34 \uac00\ub2a5\uc131\uc744 \ub192\uc785\ub2c8\ub2e4.<\/p>\n\n      <h3>5. \ubbfc\uac10\ud654\ub294 \ub0b4\uc2dd\uc131\uc744 \uc800\ud558\uc2dc\ud0b5\ub2c8\ub2e4.<\/h3>\n      <p>If cooling through the range of approximately 800\u20131600\u00b0F \/ 427\u2013871\u00b0C is not properly controlled, chromium carbides can precipitate along grain boundaries.<\/p>\n      <p>\uc774\ub85c \uc778\ud574 \uc8fc\ubcc0 \ub9e4\ud2b8\ub9ad\uc2a4\uc758 \ud06c\ub86c \ud568\ub7c9\uc774 \ubd80\ub3d9\ud0dc\ud654\uc5d0 \ud544\uc694\ud55c \uc218\uc900 \uc774\ud558\ub85c \uac10\uc18c\ud558\uc5ec \uc7ac\ub8cc\uac00 \uc785\uc790\uac04 \ubd80\uc2dd \ubc0f \uc751\ub825 \ubd80\uc2dd \uade0\uc5f4\uc5d0 \ucde8\uc57d\ud574\uc9d1\ub2c8\ub2e4. \uc774\ub7ec\ud55c \ud30c\uc190 \uc720\ud615\uc740 \ub0b4\ub9c8\ubaa8\uc131\uacfc \ub0b4\uc2dd\uc131\uc774 \ubaa8\ub450 \uc694\uad6c\ub418\ub294 \uc751\uc6a9 \ubd84\uc57c\uc5d0\uc11c \ud2b9\ud788 \uc911\uc694\ud569\ub2c8\ub2e4.<\/p>\n\n      <h3>6. \uc218\uc18c \ucde8\uc131\uc740 \ud30c\uad34 \uc9c0\uc5f0\uc744 \ucd08\ub798\ud569\ub2c8\ub2e4.<\/h3>\n      <p>\uacbd\ub3c4\uac00 \ub192\uc740 440C \ud569\uae08\uc740 \uc218\uc18c\uc5d0 \uc758\ud55c \ud30c\uc190\uc5d0 \ub9e4\uc6b0 \ucde8\uc57d\ud574\uc9d1\ub2c8\ub2e4. \uac00\uacf5 \ub610\ub294 \ud45c\uba74 \ucc98\ub9ac \uacfc\uc815\uc5d0\uc11c \uc720\uc785\ub41c \uc218\uc18c\ub294 \uaca9\uc790 \ub0b4\ubd80\ub85c \ud655\uc0b0\ub418\uc5b4 \uc751\ub825 \uc9d1\uc911 \ubd80\uc704\uc5d0 \ucd95\uc801\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n      <p>\ud558\uc911\uc744 \ubc1b\uc73c\uba74 \uc0ac\uc804 \ubcc0\ud615 \uc5c6\uc774 \uac11\uc791\uc2a4\ub7ec\uc6b4 \ucde8\uc131 \ud30c\uad34\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub7ec\ud55c \uc704\ud5d8\uc744 \uc644\ud654\ud558\uae30 \uc704\ud574\uc11c\ub294 \uc218\uc18c \ubc1c\uc0dd \ud658\uacbd\uc5d0 \ub178\ucd9c\ub41c \ud6c4 \ud6c4\ucc98\ub9ac \ubca0\uc774\ud0b9 \ucc98\ub9ac\uac00 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n\n      <h2>440C \uac15\ucca0 \uc5f4\ucc98\ub9ac \uc2dc \uace0\ub824\uc0ac\ud56d<\/h2>\n      <p>440C\uc758 \uc0ac\uc6a9\uc740 \ub2ec\uc131 \uac00\ub2a5\ud55c \uacbd\ub3c4\uc5d0 \uc758\ud574 \uc81c\ud55c\ub418\ub294 \uac83\uc774 \uc544\ub2c8\ub77c, \uc124\uacc4 \ubc0f \uac00\uacf5 \uacfc\uc815\uc5d0\uc11c \ub0b4\uc7ac\ub41c \uc7a5\ub2e8\uc810\uc744 \uc5bc\ub9c8\ub098 \uc798 \uad00\ub9ac\ud560 \uc218 \uc788\ub294\uc9c0\uc5d0 \ub530\ub77c \uacb0\uc815\ub429\ub2c8\ub2e4. \uc5d4\uc9c0\ub2c8\uc5b4\ub9c1 \uacb0\uc815\uc740 \uadf9\ud55c\uc758 \ub0b4\ub9c8\ubaa8\uc131\uacfc \uc81c\ud55c\ub41c \uc778\uc131, \uce58\uc218 \ubbfc\uac10\ub3c4, \uc81c\uc870 \uc81c\uc57d \uc870\uac74 \uc0ac\uc774\uc5d0\uc11c \uade0\ud615\uc744 \uc774\ub8e8\uc5b4\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n      <h3>1. \uc801\uc6a9 \uc2dc \ub0b4\uad6c\uc131\ubcf4\ub2e4 \ub0b4\ub9c8\ubaa8\uc131\uc744 \uc6b0\uc120\uc2dc\ud574\uc57c \ud569\ub2c8\ub2e4.<\/h3>\n      <p>440C\ub294 \ucd5c\ub300 \uc57d 60 HRC\uc758 \ub9e4\uc6b0 \ub192\uc740 \uacbd\ub3c4\uc640 285 ksi\uc5d0 \uac00\uae4c\uc6b4 \uc778\uc7a5 \uac15\ub3c4\ub97c \uc81c\uacf5\ud569\ub2c8\ub2e4. \ud558\uc9c0\ub9cc \uc774\ub294 \uadf9\ub3c4\ub85c \ub0ae\uc740 \uc5f0\uc131\uacfc \ucda9\uaca9 \uc800\ud56d\uc131\uc744 \uac10\uc218\ud574\uc57c \ud558\ub294 \ub2e8\uc810\uc785\ub2c8\ub2e4. \uc5f0\uc2e0\uc728\uc740 \uc57d 2%\uae4c\uc9c0 \ub5a8\uc5b4\uc9c8 \uc218 \uc788\uc73c\uba70, \ucda9\uaca9 \uc778\uc131\uc740 \uc57d 5 ft-lb \uc815\ub3c4\uc785\ub2c8\ub2e4.<\/p>\n      <p>\uc774\ub7ec\ud55c \ud2b9\uc131\uc73c\ub85c \uc778\ud574 \ubca0\uc5b4\ub9c1, \ubc38\ube0c \ubd80\ud488 \ubc0f \uc808\uc0ad \uacf5\uad6c\uc640 \uac19\uc774 \ub0b4\ub9c8\ubaa8\uc131\uacfc \ub0a0 \uc720\uc9c0\ub825\uc774 \uc911\uc694\ud55c \ubd80\ud488\uc5d0 \uc801\ud569\ud569\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \ucda9\uaca9 \ud558\uc911, \uc555\ub825 \uc720\uc9c0 \ub610\ub294 \ucde8\uc131 \ud30c\uad34\uac00 \uc8fc\ub41c \ud30c\uc190 \uc6d0\uc778\uc778 \uad6c\uc870\uc801 \uc751\ub825\uc744 \ubc1b\ub294 \ubd80\ud488\uc5d0\ub294 \uc0ac\uc6a9\ud574\uc11c\ub294 \uc548 \ub429\ub2c8\ub2e4.<\/p>\n\n      <h3>2. \uce58\uc218 \uc548\uc815\uc131\uc744 \uc704\ud574\uc11c\ub294 \uacf5\uc815\uc0c1\uc758 \ub178\ub825\uc774 \ud544\uc694\ud569\ub2c8\ub2e4.<\/h3>\n      <p>\ud569\uae08 \ud568\ub7c9\uacfc \ud0c4\uc18c \ud568\ub7c9\uc774 \ub192\uc740 440C\ub294 \ubcf8\uc9c8\uc801\uc73c\ub85c \uc794\ub958 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\uc640 \uc9c0\uc5f0 \ubcc0\ud0dc\uac00 \ubc1c\uc0dd\ud558\uae30 \uc27d\uc2b5\ub2c8\ub2e4. \uc815\ubc00 \ubd80\ud488\uc758 \uacbd\uc6b0, \uce58\uc218 \uc548\uc815\uc131\uc740 \uc7ac\ub8cc \uc120\ud0dd\ub9cc\uc73c\ub85c \ubcf4\uc7a5\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc801\uc808\ud55c \uadf9\uc800\uc628 \ubcc0\ud0dc \ubc0f \ud6c4\uc18d \uc751\ub825 \uc644\ud654\ub97c \ud3ec\ud568\ud558\ub294 \uc5f4\ucc98\ub9ac \uacf5\uc815\uc774 \ud544\uc218\uc801\uc785\ub2c8\ub2e4.<\/p>\n      <p>\uc774\ub7ec\ud55c \ub2e8\uacc4\ub97c \uc77c\uad00\ub418\uac8c \uc81c\uc5b4\ud560 \uc218 \uc5c6\ub2e4\uba74 \uce58\uc218 \ubcc0\ud654, \ubcc0\ud615 \ub610\ub294 \uc9c0\uc5f0 \uade0\uc5f4\uc758 \uc704\ud5d8\uc774 \uc5ec\uc804\ud788 \ud07d\ub2c8\ub2e4.<\/p>\n\n      <h3>3. \uc628\ub3c4 \uc870\uc808 \ubc94\uc704\uac00 \uc131\ub2a5 \uade0\ud615\uc744 \uc5c4\uaca9\ud558\uac8c \uc81c\ud55c\ud569\ub2c8\ub2e4.<\/h3>\n      <p>440\u00b0C\uc5d0\uc11c \uc0ac\uc6a9 \uac00\ub2a5\ud55c \uc5f4\ucc98\ub9ac \ubc94\uc704\ub294 \uc881\uc544\uc11c \uc131\ub2a5 \ud55c\uacc4\uac00 \uc9c1\uc811\uc801\uc73c\ub85c \uc81c\ud55c\ub429\ub2c8\ub2e4. \uc800\uc628 \uc5f4\ucc98\ub9ac\ub294 \uacbd\ub3c4\uc640 \ub0b4\uc2dd\uc131\uc744 \uc720\uc9c0\ud558\ub294 \ubc18\uba74, \uc911\uac04 \uc628\ub3c4\uc5d0 \ub178\ucd9c\ub418\uba74 \uc778\uc131\uacfc \ud654\ud559\uc801 \uc548\uc815\uc131\uc774 \uae09\uaca9\ud788 \uc800\ud558\ub429\ub2c8\ub2e4.<\/p>\n      <p>\uc774\ub7ec\ud55c \ud55c\uacc4\ub85c \uc778\ud574 440C\ub294 \uad11\ubc94\uc704\ud55c \ud2b9\uc131 \ubc94\uc704\uc5d0 \uac78\uccd0 \uc27d\uac8c \uc870\uc815\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4. \ub530\ub77c\uc11c \uc5c4\uaca9\ud558\uac8c \uc815\uc758\ub41c \uc791\ub3d9 \ubc94\uc704 \ub0b4\uc5d0\uc11c \uc0ac\uc6a9\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n      <h3>4. \uc81c\uc870 \ube44\uc6a9 \ubc0f \uac00\uacf5 \ub09c\uc774\ub3c4\ub97c \uace0\ub824\ud574\uc57c \ud569\ub2c8\ub2e4.<\/h3>\n      <p>440C\ub294 \uc5b4\ub2d0\ub9c1 \ucc98\ub9ac\ub41c \uc0c1\ud0dc\uc5d0\uc11c\ub3c4 \ub192\uc740 \uacbd\ub3c4\ub97c \uac00\uc9c0\uba70, \ub2e8\ub2e8\ud55c \ud06c\ub86c \uce74\ubc14\uc774\ub4dc\uac00 \ud568\uc720\ub418\uc5b4 \uc788\uc5b4 \uc81c\uc870\uc5d0 \uc0c1\ub2f9\ud55c \uc5b4\ub824\uc6c0\uc744 \ucd08\ub798\ud569\ub2c8\ub2e4. \uac00\uacf5\uc131\uc774 \uc77c\ubc18 \ud0c4\uc18c\uac15\ubcf4\ub2e4 \ud604\uc800\ud788 \ub5a8\uc5b4\uc838 \uacf5\uad6c \ub9c8\ubaa8\uac00 \uc99d\uac00\ud558\uace0 \uac00\uacf5 \uc18d\ub3c4\uac00 \ub290\ub824\uc9c0\uba70 \uc0dd\uc0b0 \ube44\uc6a9\uc774 \uc0c1\uc2b9\ud569\ub2c8\ub2e4.<\/p>\n      <p>\ucd5c\uc885 \uacbd\ud654 \uc804\uc5d0 \ubaa8\ub4e0 \uc131\ud615 \ubc0f \uac00\uacf5 \uc791\uc5c5\uc744 \uc644\ub8cc\ud574\uc57c \ud569\ub2c8\ub2e4. \uacbd\ud654 \ud6c4 \uacf5\uc815\uc740 \ub9e4\uc6b0 \uc81c\ud55c\uc801\uc774\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/p>\n\n      <h3>5. \ucca8\ub2e8 \uc81c\uc870 \uacf5\uc815\uc5d0\uc11c \ucc98\ub9ac \uac00\ub2a5 \uae30\uac04\uc740 \ub9e4\uc6b0 \uc9e7\uc2b5\ub2c8\ub2e4.<\/h3>\n      <p>\uae08\uc18d \uc0ac\ucd9c \uc131\ud615\uacfc \uac19\uc740 \uacf5\uc815\uc5d0\uc11c 440C\ub294 \uc870\uc131 \ubc0f \uc5f4 \uc0ac\uc774\ud074\uc5d0 \ub300\ud55c \ub9e4\uc6b0 \uc5c4\uaca9\ud55c \uc81c\uc5b4\uac00 \ud544\uc694\ud569\ub2c8\ub2e4. \uae09\uaca9\ud55c \ubc00\ub3c4 \uc99d\uac00\uc640 \uc0c1\ubcc0\ud654\ub85c \uc778\ud574 \uacf5\uc815 \uc81c\uc5b4\uac00 \uc815\ubc00\ud558\uc9c0 \uc54a\uc73c\uba74 \ubcc0\ud615\uc774 \ubc1c\uc0dd\ud558\uae30 \uc27d\uc2b5\ub2c8\ub2e4.<\/p>\n      <p>\uc774 \ub54c\ubb38\uc5d0 440C\ub294 \uc800\ud569\uae08\uac15\uc5d0 \ube44\ud574 \uacf5\uc815 \ubcc0\ub3d9\uc5d0 \ub300\ud55c \ub0b4\uc131\uc774 \ub5a8\uc5b4\uc9d1\ub2c8\ub2e4.<\/p>\n\n      <div class=\"aobo-note-box\">\n        <p>\uc544\uc624\ubcf4 \uc2a4\ud2f8\uc740 \ucd5c\uc885 \uacbd\ud654 \ub610\ub294 \uc5f4\ucc98\ub9ac \uacf5\uc815\uc744 \uc81c\uacf5\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ub2f9\uc0ac\ub294 440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \uc18c\uc7ac\ub97c \uacf5\uae09\ud558\uba70, \uace0\uac1d \ub610\ub294 \uc790\uaca9\uc744 \uac16\ucd98 \uc5f4\ucc98\ub9ac \uc5c5\uccb4\uc5d0\uc11c \uac00\uacf5 \ubc0f \ud6c4\uc18d \uc5f4\ucc98\ub9ac\ub97c \uc218\ud589\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n        <p>\ubcf8 \uc548\ub0b4\uc11c\uc758 \uc5f4\ucc98\ub9ac \ub370\uc774\ud130\ub294 \uace0\uac1d, \uacf5\uad6c \uc81c\uc791\uc790 \ubc0f \uc5f4\ucc98\ub9ac \uc804\ubb38\uac00\ub97c \uc704\ud55c \uae30\uc220 \ucc38\uace0 \uc790\ub8cc\ub85c \uc81c\uacf5\ub429\ub2c8\ub2e4.<\/p>\n      <\/div>\n    <\/main>\n\n    <section class=\"aobo-related-pages\" aria-label=\"440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \uad00\ub828 \ud398\uc774\uc9c0\">\n      <h2>\uad00\ub828 \ud398\uc774\uc9c0<\/h2>\n      <div class=\"aobo-related-grid\">\n        <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/ko\/440c-stainless-steel-applications\/\">\n          <strong>440C \uc801\uc6a9 \ubd84\uc57c<\/strong>\n          <span>440C\ub294 \ubca0\uc5b4\ub9c1\ubd80\ud130 \ubc38\ube0c \ubd80\ud488\uae4c\uc9c0 \ub2e4\uc591\ud55c \ubd80\ud488 \uc720\ud615\uc5d0 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/span>\n        <\/a>\n        <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/ko\/440c-stainless-steel-properties\/\">\n          <strong>440C \uc18d\uc131<\/strong>\n          <span>\uad6c\uc131, \uacbd\ub3c4, \uae30\uacc4\uc801 \ud2b9\uc131 \ub370\uc774\ud130 \ubc0f \ub3d9\ub4f1 \ub4f1\uae09<\/span>\n        <\/a>\n        <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/ko\/440c-stainless-steel-hardened-hardness\/\">\n          <strong>440C \uacbd\ud654 \uacbd\ub3c4<\/strong>\n          <span>\ub2f4\uae08\uc9c8 \uc9c1\ud6c4 \uac12\uacfc \ud15c\ud37c\ub9c1 \ud6c4 \uac12\uc758 \ucc28\uc774 \ubc0f \ubcf4\uace0\ub41c HRC \uac12\uc774 \ub2e4\ub978 \uc774\uc720<\/span>\n        <\/a>\n      <\/div>\n    <\/section>\n\n    <section class=\"aobo-final-cta\">\n      <div>\n        <h2>\uacbd\ud654 \ubd80\ud488\uc5d0 440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15\uc774 \ud544\uc694\ud558\uc2e0\uac00\uc694?<\/h2>\n        <p>\uc544\uc624\ubcf4 \uc2a4\ud2f8\uc740 \ubca0\uc5b4\ub9c1, \ubc38\ube0c, \uc808\uc0ad \uacf5\uad6c, \ub9c8\ubaa8 \ubd80\ud488, \uacc4\uce21\uae30 \ubc0f \uc815\ubc00 \ubd80\ud488\uc6a9 440C \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15\uc744 \uacf5\uae09\ud569\ub2c8\ub2e4. \ub300\ub7c9 \uacf5\uae09\uc744 \uc6d0\ud558\uc2dc\uba74 \ud544\uc694\ud55c \ud06c\uae30, \uc218\ub7c9 \ubc0f \ud45c\uba74 \ucc98\ub9ac \uc870\uac74\uc744 \uc54c\ub824\uc8fc\uc2ed\uc2dc\uc624.<\/p>\n      <\/div>\n      <div class=\"aobo-cta-buttons\">\n        <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/ko\/440c-stainless-steel\/\">440C \uc2a4\ud14c\uc778\ub9ac\uc2a4 \uc2a4\ud2f8 \ubcf4\uae30<\/a>\n        <a class=\"aobo-btn popmake-16052\" href=\"javascript:void(0);\">\ubb38\uc758 \ubcf4\ub0b4\uae30<\/a>\n      <\/div>\n    <\/section>\n  <\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>440C Stainless Steel Heat Treatment Guide 440C Stainless Steel Heat Treatment Guide To heat treat 440C stainless steel, preheat the steel to reduce thermal stress, then austenitize at 1850\u20131950\u00b0F \/ 1008\u20131063\u00b0C. After soaking, quench in oil, air, or polymer, depending on section size and part geometry. For precision parts, subzero treatment at -100\u00b0F \/ -73\u00b0C [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15763,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"normal-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-14776","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.1 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>440C Stainless Steel Heat Treatment Guide | Process, Hardness &amp; Failures<\/title>\n<meta name=\"description\" content=\"440C heat treatment explained: austenitizing, quenching, subzero, tempering, and how AMS-H-6875 and AMS 2759\/5 apply. 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