{"id":16026,"date":"2026-06-23T09:59:46","date_gmt":"2026-06-23T01:59:46","guid":{"rendered":"https:\/\/aobosteel.com\/?p=16026"},"modified":"2026-06-23T09:59:47","modified_gmt":"2026-06-23T01:59:47","slug":"4340-steel-properties","status":"publish","type":"post","link":"https:\/\/aobosteel.com\/ko\/blog\/4340-steel-properties\/","title":{"rendered":"4340\uac15\uc758 \ud2b9\uc131: \uad6c\uc131 \ubc0f \uc5f4\ucc98\ub9ac"},"content":{"rendered":"<h1 class=\"wp-block-heading has-text-align-center\" id=\"h-4340-steel-properties\">4340 \uac15\ucca0 \ud2b9\uc131<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">4340\uc740 \uc911\ud0c4\uc18c \ub2c8\ucf08-\ud06c\ub86c-\ubab0\ub9ac\ube0c\ub374 \ud569\uae08\uac15(AISI\/SAE 4340)\uc785\ub2c8\ub2e4. \ucd08\uace0\uac15\ub3c4 \uad6c\uc870\uc6a9\uac15\uc5d0 \uc18d\ud558\uba70, \uc2ec\uacbd\ud654\uc131, \uace0\uac15\ub3c4\uc5d0\uc11c\uc758 \ub192\uc740 \uc778\uc131, \uadf8\ub9ac\uace0 \uc6b0\uc218\ud55c \ud53c\ub85c \uc131\ub2a5\uc774 \ud2b9\uc9d5\uc785\ub2c8\ub2e4. \ub300\ud45c\uc801\uc778 \uc6a9\ub3c4\ub85c\ub294 \ud56d\uacf5\uae30 \ucc29\ub959\uc7a5\uce58, \uace0\ud558\uc911 \ucd95 \ubc0f \ucc28\ucd95, \uae30\uc5b4, \ud06c\ub7ad\ud06c\ucd95, \uadf8\ub9ac\uace0 \ub450\uaebc\uc6b4 \ub2e8\uba74\uc5d0\uc11c \ub192\uc740 \uc751\ub825\uc744 \ubc1b\ub294 \uae30\ud0c0 \ubd80\ud488\ub4e4\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ubbf8\ub9ac \uae30\ub300\uce58\ub97c \uc124\uc815\ud558\ub294 \uac83\uc774 \uc911\uc694\ud569\ub2c8\ub2e4. 4340\uc740 \uacf5\uad6c\uac15\uc774 \uc544\ub2d9\ub2c8\ub2e4. \uad6c\uc870\uc6a9 \ud569\uae08\uac15\uc73c\ub85c, \uae08\ud615 \ubc0f \uc808\uc0ad \uc791\uc5c5\uc5d0 \ud544\uc694\ud55c \ub0b4\ub9c8\ubaa8\uc131\uc774\ub098 \uace0\uc628 \uacbd\ub3c4\ub97c \uc704\ud574 \uc124\uacc4\ub41c \uac15\uc885\uc774 \uc544\ub2d9\ub2c8\ub2e4. \uae08\ud615, \ud380\uce58 \ub610\ub294 \uace0\uc628 \uac00\uacf5 \uacf5\uad6c\uc6a9 \uc7ac\ub8cc\ub97c \uc120\ud0dd\ud558\ub294 \uacbd\uc6b0, \uc544\ub798\uc758 \uacf5\uad6c\uac15\uacfc\uc758 \ube44\uad50 \ub0b4\uc6a9\uc744 \ucc38\uc870\ud558\uc2ed\uc2dc\uc624.<\/p>\n\n\n\n<h2 id=\"h-international-equivalents\" class=\"wp-block-heading\">\uad6d\uc81c\uc801 \ub4f1\uac00\ubb3c<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>\uae30\uc900<\/td><td>\uc9c0\uc815<\/td><\/tr><tr><td>AISI\/SAE(\ubbf8\uad6d)<\/td><td>4340<\/td><\/tr><tr><td>GB(\uc911\uad6d)<\/td><td>40CrNiMoA<\/td><\/tr><tr><td>JIS(\uc77c\ubcf8)<\/td><td>SNCM439<\/td><\/tr><tr><td>DIN\/EN (\ub3c5\uc77c\uc5b4)<\/td><td>1.6565 (40NiCrMo6)<\/td><\/tr><tr><td>BS(\uc601\uad6d)<\/td><td>817M40 (EN24)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \ub450 \uc7ac\uc9c8\uc740 \uc815\ud655\ud788 \uc77c\uce58\ud558\ub294 \uac83\uc740 \uc544\ub2c8\uc9c0\ub9cc \uc720\uc0ac\ud55c \uc7ac\uc9c8\uc785\ub2c8\ub2e4. SNCM439\ub294 \ub2c8\ucf08 \ud568\ub7c9 \uba74\uc5d0\uc11c AISI 4340\uacfc \uac00\uc7a5 \uc720\uc0ac\ud569\ub2c8\ub2e4. GB 40CrNiMoA\ub294 \ub2c8\ucf08 \ud568\ub7c9\uc774 1.25~1.65%\ub85c AISI 4340(1.65~2.00%)\ubcf4\ub2e4 \ub0ae\uc73c\uba70, 817M40\uc740 \ud06c\ub86c \ud568\ub7c9\uc774 \ub354 \ub192\uc2b5\ub2c8\ub2e4. \uc7ac\uc9c8\uc744 \uc11c\ub85c \ub300\uccb4\ud560 \ub54c\ub294 \uc815\ud655\ud55c \uc0ac\uc591\uc744 \ud655\uc778\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 id=\"h-chemical-composition\" class=\"wp-block-heading\">\ud654\ud559\uc801 \uc870\uc131<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>\uc694\uc18c<\/td><td>AISI 4340<\/td><td>GB 40CrNiMoA<\/td><\/tr><tr><td>\ud0c4\uc18c \u00a9<\/td><td>0.38\uc5d0\uc11c 0.43\uae4c\uc9c0<\/td><td>0.37\uc5d0\uc11c 0.44\uae4c\uc9c0<\/td><\/tr><tr><td>\ub9dd\uac04(Mn)<\/td><td>0.60\uc5d0\uc11c 0.80\uae4c\uc9c0<\/td><td>0.50\uc5d0\uc11c 0.80\uae4c\uc9c0<\/td><\/tr><tr><td>\uc2e4\ub9ac\ucf58(Si)<\/td><td>0.15\uc5d0\uc11c 0.35\uae4c\uc9c0<\/td><td>0.17\uc5d0\uc11c 0.37\uae4c\uc9c0<\/td><\/tr><tr><td>\ub2c8\ucf08(Ni)<\/td><td>1.65\uc5d0\uc11c 2.00\uae4c\uc9c0<\/td><td>1.25\uc5d0\uc11c 1.65\uae4c\uc9c0<\/td><\/tr><tr><td>\ud06c\ub86c(Cr)<\/td><td>0.70\uc5d0\uc11c 0.90\uae4c\uc9c0<\/td><td>0.60\uc5d0\uc11c 0.90\uae4c\uc9c0<\/td><\/tr><tr><td>\ubab0\ub9ac\ube0c\ub374(Mo)<\/td><td>0.20\uc5d0\uc11c 0.30\uae4c\uc9c0<\/td><td>0.15\uc5d0\uc11c 0.25\uae4c\uc9c0<\/td><\/tr><tr><td>\uc778(P)<\/td><td>\ucd5c\ub300 0.035<\/td><td>\ucd5c\ub300 0.035<\/td><\/tr><tr><td>\ud669(S)<\/td><td>\ucd5c\ub300 0.040<\/td><td>\ucd5c\ub300 0.035<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\uc218\uce58\ub294 \ubc31\ubd84\uc728\ub85c \ud45c\uc2dc\ub429\ub2c8\ub2e4. \ub2c8\ucf08, \ud06c\ub86c, \ubab0\ub9ac\ube0c\ub374\uc758 \uc870\ud569\uc774 4340\uac15\uc758 \ud2b9\uc131\uc744 \uacb0\uc815\ud569\ub2c8\ub2e4. \ub2c8\ucf08\uc740 \ud2b9\ud788 \uc800\uc628\uc5d0\uc11c \uc778\uc131\uc744 \ub192\uc774\uace0 \ud06c\ub86c \ubc0f \ubab0\ub9ac\ube0c\ub374\uacfc \ud568\uaed8 \uc791\uc6a9\ud558\uc5ec \uacbd\ud654\uc131\uc744 \ub2e8\uba74 \uae4a\uc219\uc774\uae4c\uc9c0 \ud5a5\uc0c1\uc2dc\ud0b5\ub2c8\ub2e4. \ub610\ud55c \ubab0\ub9ac\ube0c\ub374\uc740 \ud15c\ud37c\ub9c1 \ucde8\uc131\uc5d0 \ub300\ud55c \ubbfc\uac10\ub3c4\ub97c \uac10\uc18c\uc2dc\ud0a4\uace0 \ud15c\ud37c\ub9c1 \uacfc\uc815\uc5d0\uc11c \uac15\uc7ac\uc758 \uac15\ub3c4\ub97c \uc720\uc9c0\ud558\ub294 \ub370 \ub3c4\uc6c0\uc744 \uc90d\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 id=\"h-mechanical-properties-and-heat-treatment-response\" class=\"wp-block-heading\">\uae30\uacc4\uc801 \ud2b9\uc131 \ubc0f \uc5f4\ucc98\ub9ac \ubc18\uc751<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">4340\uac15\uc740 \ub9e4\uc6b0 \ub192\uc740 \uac15\ub3c4\ub97c \uac00\uc9c0\uba74\uc11c\ub3c4 \uc801\uc808\ud55c \uc778\uc131\uc744 \uc720\uc9c0\ud558\ub294\ub370, \uc774\ub7ec\ud55c \uade0\ud615\uc774 4340\uac15\uc758 \ud575\uc2ec\uc801\uc778 \ud2b9\uc131\uc785\ub2c8\ub2e4. \uc544\ub798 \uc218\uce58\ub294 \uc624\uc77c \ub2f4\uae08\uc9c8 \ud6c4 \ud15c\ud37c\ub9c1 \ucc98\ub9ac \uc2dc\uc758 \uc77c\ubc18\uc801\uc778 \ubc94\uc704\uc785\ub2c8\ub2e4. \uc2e4\uc81c \uac12\uc740 \ub2e8\uba74 \ud06c\uae30, \uc815\ud655\ud55c \ud15c\ud37c\ub9c1 \uc628\ub3c4 \ubc0f \uc2dc\ud5d8 \uae30\uc900\uc5d0 \ub530\ub77c \ub2ec\ub77c\uc9d1\ub2c8\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>\uc0c1\ud0dc<\/td><td>\uc778\uc7a5\ub825<\/td><td>\uc0dd\uc0b0\ud558\ub2e4<\/td><td>\uc5f0\uc7a5<\/td><td>\uacbd\ub3c4<\/td><\/tr><tr><td>\uc5b4\ub2d0\ub9c1\ub41c<\/td><td>\uc57d 745 MPa<\/td><td>\uc57d 470 MPa<\/td><td>~22%<\/td><td>~217 HB<\/td><\/tr><tr><td>Q&amp;T, \uc800\uc628(~200\u00b0C)<\/td><td>1800~2000 MPa<\/td><td>1500~1700 MPa<\/td><td>8~12%<\/td><td>50~54 HRC<\/td><\/tr><tr><td>Q&amp;T, \uc911\uac04 \uc628\ub3c4(~400\u00b0C)<\/td><td>1300~1500 MPa<\/td><td>1150~1350 MPa<\/td><td>10\uc5d0\uc11c 14%\uae4c\uc9c0<\/td><td>40~45 HRC<\/td><\/tr><tr><td>Q&amp;T, \uace0\uc628(~600\u00b0C)<\/td><td>1000~1200 MPa<\/td><td>850~1000 MPa<\/td><td>14\uc5d0\uc11c 20%\uae4c\uc9c0<\/td><td>32~38 HRC<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2f4\uae08\uc9c8 \uc9c1\ud6c4\uc758 \uacbd\ub3c4\ub294 \ud15c\ud37c\ub9c1 \uc804 \uc57d 55~57 HRC\uc785\ub2c8\ub2e4. \ud15c\ud37c\ub9c1\uc740 \uacbd\ub3c4\uc640 \uac15\ub3c4\ub97c \ud76c\uc0dd\ud558\uc5ec \uc778\uc131\uacfc \uc5f0\uc131\uc744 \ud5a5\uc0c1\uc2dc\ud0a4\ub294 \uacfc\uc815\uc774\ubbc0\ub85c, \ud15c\ud37c\ub9c1 \uc628\ub3c4\ub294 \ud558\uc911 \uc870\uac74\uc5d0 \ub9de\ucdb0 \uc120\ud0dd\ub429\ub2c8\ub2e4.<\/p>\n\n\n\n<h3 id=\"h-tempering-ranges-to-watch\" class=\"wp-block-heading\">\uc8fc\uc758 \uae4a\uac8c \uc0b4\ud3b4\ubd10\uc57c \ud560 \ub2f4\uae08\uc9c8 \ubc94\uc704<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">4340\uac15\uc744 \ud15c\ud37c\ub9c1\ud560 \ub54c \uc911\uc694\ud55c \ub450 \uac00\uc9c0 \ud615\ud0dc\uc758 \ucde8\uc131 \ud604\uc0c1\uc774 \uc788\uc2b5\ub2c8\ub2e4. 230\u00b0C\uc5d0\uc11c 370\u00b0C \ubc94\uc704\uc5d0\uc11c \ud15c\ud37c\ub9c1\ud558\uba74 \ud15c\ud37c\ub9c1\ub41c \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8\uac00 \ucde8\uc131\ud654\ub418\uc5b4 \uacbd\ub3c4\ub294 \ub192\uac8c \uc720\uc9c0\ub418\ub354\ub77c\ub3c4 \ucda9\uaca9 \uc778\uc131\uc774 \uc800\ud558\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub610\ud55c, \uc57d 375\u00b0C\uc5d0\uc11c 575\u00b0C \uc0ac\uc774\uc758 \uc628\ub3c4\uc5d0\uc11c \uc11c\uc11c\ud788 \ub0c9\uac01\ud558\uba74 \uc774\uc804 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8 \uacb0\uc815\ub9bd\uacc4\uc5d0 \uc778\uc774 \ud3b8\uc11d\ub418\uc5b4 \uac00\uc5ed\uc801\uc778 \ud15c\ud37c\ub9c1 \ucde8\uc131\uc774 \ubc1c\uc0dd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ucda9\uaca9 \ud558\uc911\uc744 \ubc1b\ub294 \ubd80\ud488\uc758 \uacbd\uc6b0, \uc81c\uc870\uc5c5\uccb4\ub294 \uc77c\ubc18\uc801\uc73c\ub85c \ud15c\ud37c\ub9c1 \uc628\ub3c4\ub97c \uc57d 230\u00b0C \uc774\ud558 \ub610\ub294 \uc57d 425\u00b0C \uc774\uc0c1\uc73c\ub85c \uc720\uc9c0\ud558\uace0 \uace0\uc628 \ubc94\uc704\uc5d0\uc11c \uae09\uc18d \ub0c9\uac01\ud569\ub2c8\ub2e4. 4340\uac15\uc5d0 \ud568\uc720\ub41c \ubab0\ub9ac\ube0c\ub374\uc740 \uc774\ub7ec\ud55c \ubbfc\uac10\uc131\uc744 \uac10\uc18c\uc2dc\ud0a4\uc9c0\ub9cc \uc644\uc804\ud788 \uc81c\uac70\ud558\uc9c0\ub294 \ubabb\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 id=\"h-hardenability-the-main-advantage\" class=\"wp-block-heading\">\uac15\ud654\uc131: \uc8fc\uc694 \uc7a5\uc810<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5d4\uc9c0\ub2c8\uc5b4\ub4e4\uc774 4340\uac15\uc744 \uc120\ud638\ud558\ub294 \uc774\uc720\ub294 \ubc14\ub85c \ub6f0\uc5b4\ub09c \uacbd\ud654\uc131 \ub54c\ubb38\uc785\ub2c8\ub2e4. \ub2c8\ucf08-\ud06c\ub86c-\ubab0\ub9ac\ube0c\ub374 \ud569\uae08\uacc4 \ub355\ubd84\uc5d0 4340\uac15\uc740 \uc624\uc77c \ub2f4\uae08\uc9c8 \uc2dc \ub450\uaebc\uc6b4 \ub2e8\uba74 \uc804\uccb4\uc5d0 \uac78\uccd0 \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8 \ubcc0\ud0dc\ub97c \uc77c\uc73c\ud0a4\ubbc0\ub85c, \ub300\ud615 \ucd95\uc774\ub098 \ub79c\ub529 \uae30\uc5b4 \ubd80\ud488\uc740 \ud45c\uba74\uc5d0\uc11c \uc911\uc2ec\ubd80\uae4c\uc9c0 \uac70\uc758 \uade0\uc77c\ud55c \uacbd\ub3c4\ub97c \uc5bb\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. 4140\uacfc \uac19\uc740 \uc800\ud569\uae08\uac15\uc740 \uac00\ub294 \ubd09\uc5d0\uc11c\ub294 \uacbd\ud654\uac00 \uc798 \ub418\uc9c0\ub9cc, \ub450\uaebc\uc6b4 \ub2e8\uba74\uc5d0\uc11c\ub294 \uc911\uc2ec\ubd80\uac00 \uc5f0\ud654\ub418\uc5b4 \uac15\ub3c4\uac00 \uc57d\ud574\uc9c0\ub294 \uacbd\ud5a5\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc57d 75~100mm \uc774\uc0c1\uc758 \ub2e8\uba74\uc5d0\uc11c \ubaa8\ub4e0 \ud2b9\uc131\uc774 \uc694\uad6c\ub420 \uacbd\uc6b0, 4340\uac15\uc774 \uc2e4\uc6a9\uc801\uc778 \uc120\ud0dd\uc774 \ub418\ub294 \uacbd\uc6b0\uac00 \ub9ce\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 id=\"h-4340-vs-4140\" class=\"wp-block-heading\">4340 \ub300 4140<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/aobosteel.com\/ko\/blog\/4140-steel-properties\/\">4140<\/a> 4140\uacfc 4340\uc740 \ud06c\ub86c-\ubab0\ub9ac\ube0c\ub374\uc744 \uae30\ubcf8 \uc6d0\uc18c\ub85c \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \ucc28\uc774\uc810\uc740 \ub2c8\ucf08 \ud568\ub7c9\uc785\ub2c8\ub2e4. 4140\uc5d0\ub294 \ub2c8\ucf08\uc774 \uac70\uc758 \uc5c6\uc9c0\ub9cc, 4340\uc5d0\ub294 1.65~2.00%\uac00 \ud568\uc720\ub418\uc5b4 \uc788\uc73c\uba70, \uc774 \ub2c8\ucf08 \ud568\ub7c9\uc774 \uc2e4\uc81c \uc0ac\uc6a9\uc5d0\uc11c \ub450 \uae08\uc18d\uc744 \uad6c\ubd84\ud558\ub294 \uc8fc\uc694 \uc694\uc778\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>\uc7ac\uc0b0<\/td><td>4340<\/td><td>4140<\/td><\/tr><tr><td>\uc2ec\uce35 \uacbd\ud654\uc131<\/td><td>\ud5d8\uc900\ud55c \uc9c0\ud615\uc5d0\uc11c \ud0c1\uc6d4\ud55c \uc131\ub2a5\uc744 \ubc1c\ud718\ud569\ub2c8\ub2e4.<\/td><td>\ubcf4\ud1b5\uc758<\/td><\/tr><tr><td>\uace0\uac15\ub3c4\uc5d0\uc11c\uc758 \uc778\uc131<\/td><td>\ud6cc\ub96d\ud55c<\/td><td>\uc88b\uc740<\/td><\/tr><tr><td>\ud53c\ub85c\ub3c4<\/td><td>\ub354 \ub192\uc740<\/td><td>\uc88b\uc740<\/td><\/tr><tr><td>\uc800\uc628 \uc778\uc131<\/td><td>\uc88b\uc740<\/td><td>\uc801\uc808\ud55c<\/td><\/tr><tr><td>\uc0c1\ub300\uc801 \ube44\uc6a9<\/td><td>\ub354 \ub192\uc740 (\ub2c8\ucf08 \ud568\ub7c9)<\/td><td>\ub0ae\ucd94\ub2e4<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">4140\uac15\uc73c\ub85c\ub294 \uacbd\ud654\uac00 \ubd88\uac00\ub2a5\ud55c \ub450\uaebc\uc6b4 \ub2e8\uba74\uc5d0\uc11c \uc644\uc804\ud55c \uacbd\ub3c4\uac00 \ud544\uc694\ud560 \ub54c, \ub192\uc740 \uac15\ub3c4\uc5d0\uc11c \ucd5c\ub300 \uc778\uc131\uc774 \uc694\uad6c\ub420 \ub54c, \ud56d\uacf5\uae30 \ubd80\ud488\uc774\ub098 \uace0\ud558\uc911 \uc0e4\ud504\ud2b8\uc640 \uac19\uc774 \ud53c\ub85c \ud558\uc911\uc744 \ubc1b\ub294 \ubd80\ud488\uc77c \ub54c, \ub610\ub294 \uc800\uc628 \uc778\uc131\uc774 \uc911\uc694\ud55c \uacbd\uc6b0\uc5d0\ub294 4340\uac15\uc744 \uc120\ud0dd\ud558\ub294 \uac83\uc774 \uc88b\uc2b5\ub2c8\ub2e4. \uc911\uac04 \uac15\ub3c4\uc758 \uc587\uc740 \ub2e8\uba74\uc5d0\ub294 \uc77c\ubc18\uc801\uc73c\ub85c 4140\uac15\uc774 \ub354 \uacbd\uc81c\uc801\uc778 \uc120\ud0dd\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 id=\"h-4340-vs-tool-steel\" class=\"wp-block-heading\">4340 vs \uacf5\uad6c\uac15<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ub9ce\uc740 \uad6c\ub9e4\uc790\ub4e4\uc774 \uc774 \ud398\uc774\uc9c0\ub97c \ucc3e\ub294 \uc774\uc720\uac00 \ubc14\ub85c \uc774 \uc810 \ub54c\ubb38\uc774\ubbc0\ub85c, \uba85\ud655\ud558\uac8c \uc124\uba85\ud558\ub294 \uac83\uc774 \uc911\uc694\ud569\ub2c8\ub2e4. 4340\uac15\uc740 \uae08\ud615 \ubc0f \uc808\uc0ad \uac00\uacf5 \uc791\uc5c5\uc5d0\uc11c \uacf5\uad6c\uac15\uc744 \ub300\uccb4\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>\uc694\uad6c \uc0ac\ud56d<\/td><td>4340<\/td><td>\uacf5\uad6c\uac15(D2\/H13)<\/td><\/tr><tr><td>\ub0b4\ub9c8\ubaa8\uc131<\/td><td>\ub0ae\uc740<\/td><td>\ud0c4\ud654\ubb3c \ubd80\ud53c\ub85c \uc778\ud574 \ub192\uc74c<\/td><\/tr><tr><td>\uace0\uc628 \uacbd\ub3c4<\/td><td>\uac00\ub09c\ud55c<\/td><td>\uc88b\uc74c(H13)<\/td><\/tr><tr><td>\uc5e3\uc9c0 \uc720\uc9c0<\/td><td>\uac00\ub09c\ud55c<\/td><td>\uc88b\uc740<\/td><\/tr><tr><td>\ucd5c\ub300 \uc2e4\uc81c \uacbd\ub3c4<\/td><td>\uacbd\ub3c4 50~55 HRC<\/td><td>58~64 HRC<\/td><\/tr><tr><td>\uad6c\uc870\uc801 \uac15\ub3c4\uc640 \uc778\uc131<\/td><td>\ud6cc\ub96d\ud55c<\/td><td>\ubcf4\ud1b5\uc758<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">4340\uac15\uc740 \ubd80\ud488\uc774 \uad6c\uc870\uc801\uc774\uba70 \uc0c1\uc628 \ub610\ub294 \uc801\ub2f9\ud55c \uc628\ub3c4\uc5d0\uc11c \uadf9\ud55c\uc758 \uac15\ub3c4\uc640 \uc778\uc131\uc774 \uc694\uad6c\ub418\ub294 \uacbd\uc6b0\uc5d0 \uc801\ud569\ud569\ub2c8\ub2e4. \uacf5\uad6c\uac15\uc740 \ubd80\ud488\uc774 \ub9c8\ubaa8\uc5d0 \uac15\ud574\uc57c \ud558\uace0, \uc808\uc0ad\ub0a0\uc744 \uc720\uc9c0\ud574\uc57c \ud558\uba70, \uace0\uc628\uc5d0\uc11c\ub3c4 \uacbd\ub3c4\ub97c \uc720\uc9c0\ud574\uc57c \ud558\ub294 \uacbd\uc6b0\uc5d0 \uc801\ud569\ud569\ub2c8\ub2e4. \ub0c9\uac04 \uac00\uacf5 \uae08\ud615\uc5d0\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uc7ac\uc9c8\uc774 \ud544\uc694\ud569\ub2c8\ub2e4. <a href=\"https:\/\/aobosteel.com\/ko\/d2-tool-steel\/\">\ub5142<\/a> \ub610\ub294 <a href=\"https:\/\/aobosteel.com\/ko\/a2-tool-steel\/\">A2<\/a>. \uace0\uc628 \uc791\uc5c5\uc6a9 \uae08\ud615 \ub610\ub294 \uc555\ucd9c \uacf5\uad6c\uc5d0\ub294 \ub2e4\uc74c\uc774 \ud544\uc694\ud569\ub2c8\ub2e4. <a href=\"https:\/\/aobosteel.com\/ko\/h13-tool-steel\/\">H13<\/a> \ub610\ub294 H11. \uc774\ub7ec\ud55c \uc6a9\ub3c4\ub85c 4340\uc744 \uc0ac\uc6a9\ud558\uba74 \uc870\uae30 \ub9c8\ubaa8 \ubc0f \ubcc0\ud615\uc774 \ubc1c\uc0dd\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 id=\"h-common-applications\" class=\"wp-block-heading\">\uc77c\ubc18\uc801\uc778 \uc751\uc6a9 \ubd84\uc57c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">4340\uac15\uc740 \ud56d\uacf5\uae30 \ucc29\ub959 \uc7a5\uce58 \ubc0f \uad6c\uc870 \ubd80\ud488, \ud5ec\ub9ac\ucf65\ud130 \ubc0f \ub3d9\ub825 \uc804\ub2ec \uc7a5\uce58 \ucd95, \uc911\ud558\uc911 \ucc28\ucd95 \ubc0f \uad6c\ub3d9\ucd95, \uae30\uc5b4, \ud06c\ub7ad\ud06c\ucd95, \uace0\uac15\ub3c4 \ubcfc\ud2b8, \ucd1d\uc5f4 \ub4f1\uc5d0 \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \ud53c\ub85c\uc5d0 \ubbfc\uac10\ud55c \ud56d\uacf5\uc6b0\uc8fc \ubd80\ud488\uc740 \uac1c\uc7ac\ubb3c\uc744 \uc904\uc774\uace0 \ud53c\ub85c \uc218\uba85\uc744 \uc5f0\uc7a5\ud558\uae30 \uc704\ud574 \uc9c4\uacf5 \uc7ac\uc6a9\uc735(VAR \ub610\ub294 ESR) 4340\uac15\uc73c\ub85c \uc81c\uc791\ub418\ub294 \uacbd\uc6b0\uac00 \ub9ce\uc2b5\ub2c8\ub2e4. \uae68\ub057\ud55c \uac15\uc7ac\ub294 \ubc18\ubcf5 \ud558\uc911 \ud558\uc5d0\uc11c \uade0\uc5f4 \ubc1c\uc0dd\uc744 \uc5b5\uc81c\ud558\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/aobosteel.com\/ko\/blog\/4140-steel-properties\/\">4140\uac15\uc758 \ud2b9\uc131<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/d2-steel-vs-4140\/\">4140 vs D2 \uacf5\uad6c\uac15<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/4140-vs-h13\/\">4140 \uacf5\uad6c\uac15 vs H13 \uacf5\uad6c\uac15<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/what-is-tool-steel\/\">\uacf5\uad6c\uac15\uc774\ub780 \ubb34\uc5c7\uc778\uac00<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/how-to-select-tool-steels\/\">\uacf5\uad6c\uac15 \ub4f1\uae09 \uc120\ud0dd \uac00\uc774\ub4dc<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>4340 Steel Properties 4340 is a medium-carbon nickel-chromium-molybdenum alloy steel (AISI\/SAE 4340). It belongs to the ultra-high-strength structural steels and is valued for deep hardenability, high toughness at high strength, and strong fatigue performance. Typical uses are aircraft landing gear, heavy-duty shafts and axles, gears, crankshafts, and other parts that carry high stress in thick [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16027,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":""},"categories":[22],"tags":[],"class_list":["post-16026","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>4340 Steel Properties: Composition and Heat Treatment - AoboSteel<\/title>\n<meta name=\"description\" content=\"4340 (40CrNiMoA) is a Ni-Cr-Mo alloy steel with deep hardenability and high toughness. 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