{"id":24959,"date":"2026-11-04T12:23:01","date_gmt":"2026-11-04T04:23:01","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=24959"},"modified":"2026-11-04T13:17:46","modified_gmt":"2026-11-04T05:17:46","slug":"4140-steel-properties","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/4140-steel-properties\/","title":{"rendered":"4140 \uac15: \ud2b9\uc131, \uacbd\ub3c4 \ubc0f \uc5f4\ucc98\ub9ac"},"content":{"rendered":"<h1 id=\"h-4140-steel-properties\" class=\"wp-block-heading has-large-font-size\">4140 \uac15: \ud2b9\uc131, \uacbd\ub3c4 \ubc0f \uc5f4\ucc98\ub9ac<\/h1>\n\n\n\n<h2 id=\"h-what-is-4140-steel\" class=\"wp-block-heading\">4140\uac15\uc774\ub780 \ubb34\uc5c7\uc778\uac00\uc694?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">4140\uc740 \uc911\ud0c4\uc18c \ud06c\ub86c-\ubab0\ub9ac\ube0c\ub374 \ud569\uae08\uac15(AISI\/SAE 4140)\uc73c\ub85c \uac00\uc7a5 \ub110\ub9ac \uc0ac\uc6a9\ub418\ub294 \uae30\uacc4\uad6c\uc870\uc6a9 \uac15 \uc911 \ud558\ub098\uc785\ub2c8\ub2e4. \uc57d 0.40% \ud0c4\uc18c, 1% \ud06c\ub86c, 0.2% \ubab0\ub9ac\ube0c\ub374\uc774 \uac15\ub3c4, \uc778\uc131 \ubc0f \uacbd\ud654\ub2a5\uc758 \uade0\ud615\uc744 \uc81c\uacf5\ud558\ubbc0\ub85c, \ub2e8\uc77c \uac15\uc885\uc73c\ub85c \uc5f4\ucc98\ub9ac\ub97c \ud1b5\ud574 \ub2e4\uc591\ud55c \uac15\ub3c4 \uc218\uc900\uc744 \uad6c\ud604\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uad6d\uc81c\uc801\uc73c\ub85c \ub3d9\uc77c\ud55c \uac15\uc7ac\ub294 EN\/DIN \uaddc\uaca9\uc758 42CrMo4(1.7225), JIS \uaddc\uaca9\uc758 SCM440, GB \uaddc\uaca9\uc758 42CrMo, UNS \uaddc\uaca9\uc758 G41400\uc73c\ub85c \ud310\ub9e4\ub429\ub2c8\ub2e4. \ud654\ud559 \uc131\ubd84 \ud55c\ub3c4\ub294 \uc720\uc0ac\ud558\uc9c0\ub9cc \ub3d9\uc77c\ud558\uc9c0\ub294 \uc54a\uc73c\uba70, \uadf8 \ucc28\uc774\ub294 \uc544\ub798\uc758 \ub300\uc751 \uac15\uc885 \ud45c\uc5d0 \uc815\ub9ac\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc18c\uc7ac \uc120\uc815\uc5d0\uc11c \uc911\uc694\ud55c \uc810\uc774 \ud558\ub098 \uc788\uc2b5\ub2c8\ub2e4. 4140\uc740 \ud569\uae08 \uad6c\uc870\uc6a9 \uac15\uc774\uc9c0 \uacf5\uad6c\uac15\uc774 \uc544\ub2d9\ub2c8\ub2e4. \uc8fc \uc6a9\ub3c4\ub294 \ud558\uc911\uc744 \ubc1b\uace0 \ud53c\ub85c\uc5d0 \uc800\ud56d\ud558\ub294 \uc0e4\ud504\ud2b8, \uae30\uc5b4, \uc561\uc2ac, \ubcfc\ud2b8, \ucee4\ud50c\ub9c1 \ubc0f \uae30\uacc4 \ubd80\ud488\uc785\ub2c8\ub2e4. \ub0b4\ub9c8\ubaa8\uc131\uacfc \ub192\uc740 \uc791\uc5c5 \uacbd\ub3c4\uac00 \uc911\uc694\ud55c \uc808\ub2e8, \ube14\ub7ad\ud0b9, \uc131\ud615 \uacf5\uad6c\uc6a9\uc73c\ub85c\ub294 \uc124\uacc4\ub418\uc9c0 \uc54a\uc558\uc2b5\ub2c8\ub2e4. \uc774 \uacbd\uacc4\ub97c \uc544\ub294 \uac83\uc774 \uc624\ub798\uac00\ub294 \ubd80\ud488\uacfc \uc870\uae30\uc5d0 \ud30c\uc190\ub418\ub294 \ubd80\ud488\uc744 \uac00\ub974\ub294 \ucc28\uc774\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/11\/AISI-4140-Reference-Card.pdf\" download>4140 \uce74\ub4dc \ub2e4\uc6b4\ub85c\ub4dc, 414 KB<\/a><\/div>\n<\/div>\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 4140 (\uc911\ub7c9 %)<\/td><td>42CrMo4 \/ EN (\uc911\ub7c9 %)<\/td><td>GB 42CrMo (\uc911\ub7c9 %)<\/td><\/tr><tr><td>Carbon (C)<\/td><td>0.38\u20130.43<\/td><td>0.38\u20130.45<\/td><td>0.38\u20130.45<\/td><\/tr><tr><td>\ub9dd\uac04 (Mn)<\/td><td>0.75\u20131.00<\/td><td>0.60\u20130.90<\/td><td>0.50\u20130.80<\/td><\/tr><tr><td>\uaddc\uc18c (Si)<\/td><td>0.15\u20130.35<\/td><td>\ucd5c\ub300 0.40<\/td><td>0.17\u20130.37<\/td><\/tr><tr><td>\ud06c\ub86c (Cr)<\/td><td>0.80\u20131.10<\/td><td>0.90\u20131.20<\/td><td>0.90\u20131.20<\/td><\/tr><tr><td>\ubab0\ub9ac\ube0c\ub374 (Mo)<\/td><td>0.15\u20130.25<\/td><td>0.15\u20130.30<\/td><td>0.15\u20130.25<\/td><\/tr><tr><td>\uc778(P)<\/td><td>\ucd5c\ub300 0.035<\/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><td>\ucd5c\ub300 0.035<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud06c\ub86c\uacfc \ubab0\ub9ac\ube0c\ub374\uc774 4140\uc744 1045\uc640 \uac19\uc740 \ud0c4\uc18c\uac15\uacfc \uad6c\ubcc4\ud558\ub294 \uc694\uc18c\uc785\ub2c8\ub2e4. \ud06c\ub86c\uc740 \uacbd\ud654\ub2a5\uacfc \ub0b4\ub9c8\ubaa8\uc131\uc744 \ub192\uc774\uace0, \ubab0\ub9ac\ube0c\ub374\uc740 \uacbd\ud654\ub2a5\uc744 \ub354\uc6b1 \ud5a5\uc0c1\uc2dc\ud0a4\uba70 \uc911\uac04 \uc628\ub3c4\uc5d0\uc11c \uac15\ub3c4\ub97c \uc720\uc9c0\ud558\uace0 \uac00\uc5ed\uc801 \ud15c\ud37c \ucde8\uc131\uc744 \uc5b5\uc81c\ud569\ub2c8\ub2e4. \ub450 \uc6d0\uc18c\uc758 \uc870\ud569\uc73c\ub85c \ud0c4\uc18c\uac15\ubcf4\ub2e4 \ub450\uaebc\uc6b4 \ub2e8\uba74\ub3c4 \ub354 \uade0\uc77c\ud558\uac8c \uacbd\ud654\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 id=\"h-tempering-response\" class=\"wp-block-heading\">\ud15c\ud37c\ub9c1 \ubc18\uc751 \ubc0f \uae30\uacc4\uc801 \ud2b9\uc131<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">4140\uc740 \ub2e8\uc77c \uace0\uc815 \uc0c1\ud0dc\ub85c \uc0ac\uc6a9\ub418\ub294 \uacbd\uc6b0\uac00 \ub4dc\ubb45\ub2c8\ub2e4. \ub3d9\uc77c\ud55c \ubd09\uc7ac\uac00 30 HRC \ubd80\uadfc\uc758 \uc778\uc131 \uc788\ub294 \uc0e4\ud504\ud2b8\uac00 \ub420 \uc218\ub3c4 \uc788\uace0 50 HRC \uc774\uc0c1\uc758 \uacbd\uc9c8 \ub0b4\ub9c8\ubaa8 \ud45c\uba74\uc774 \ub420 \uc218\ub3c4 \uc788\uc73c\uba70, \uc774\ub97c \uacb0\uc815\ud558\ub294 \uac83\uc740 \ud15c\ud37c\ub9c1 \uc628\ub3c4\ubfd0\uc785\ub2c8\ub2e4. \uc544\ub798 \ud45c\ub294 845\u2013870 \u00b0C\uc5d0\uc11c \uc720\ub0c9\ud55c 25 mm \ubd09\uc7ac\uc758 \ud45c\uc900 \ud15c\ud37c\ub9c1 \ubc18\uc751\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>\ub728\uc784<\/td><td>\uc778\uc7a5 \uac15\ub3c4<\/td><td>\ud56d\ubcf5 \uac15\ub3c4<\/td><td>\uacbd\ub3c4 HB (~HRC)<\/td><\/tr><tr><td>205 \u00b0C<\/td><td>1965 MPa<\/td><td>1740 MPa<\/td><td>578 (55)<\/td><\/tr><tr><td>260 \u00b0C<\/td><td>1860 MPa<\/td><td>1650 MPa<\/td><td>534 (53)<\/td><\/tr><tr><td>315 \u00b0C<\/td><td>1720 MPa<\/td><td>1570 MPa<\/td><td>495 (50)<\/td><\/tr><tr><td>370 \u00b0C<\/td><td>1590 MPa<\/td><td>1460 MPa<\/td><td>461 (47)<\/td><\/tr><tr><td>425 \u00b0C<\/td><td>1450 MPa<\/td><td>1340 MPa<\/td><td>429 (45)<\/td><\/tr><tr><td>480 \u00b0C<\/td><td>1300 MPa<\/td><td>1210 MPa<\/td><td>388 (41)<\/td><\/tr><tr><td>540 \u00b0C<\/td><td>1150 MPa<\/td><td>1050 MPa<\/td><td>341 (37)<\/td><\/tr><tr><td>595 \u00b0C<\/td><td>1020 MPa<\/td><td>910 MPa<\/td><td>311 (34)<\/td><\/tr><tr><td>650 \u00b0C<\/td><td>900 MPa<\/td><td>790 MPa<\/td><td>277 (30)<\/td><\/tr><tr><td>705 \u00b0C<\/td><td>810 MPa<\/td><td>690 MPa<\/td><td>235 (22)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\uac12\uc740 \ub300\ud45c\uac12\uc774\uba70 \ubcf4\uc99d \ucd5c\uc18c\uac12\uc774 \uc544\ub2d9\ub2c8\ub2e4. \uacbd\ub3c4\ub294 \uc6d0\uc790\ub8cc\uc5d0 HB\ub85c \ud45c\uae30\ub418\uc5b4 \uc788\uc73c\uba70, \uad04\ud638 \uc548\uc758 HRC \uac12\uc740 \ud658\uc0b0\uac12\uc785\ub2c8\ub2e4. \uc778\uc99d\ub41c \ud2b9\uc131\uc740 \ud56d\uc0c1 \uaddc\uc815\ub41c \ub2e8\uba74 \uce58\uc218\uc640 \uba85\uc2dc\ub41c \uc2dc\ud5d8 \uc704\uce58\uc5d0 \uc5f0\uacc4\ub418\uc5b4\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 id=\"h-hardness-by-section\" class=\"wp-block-heading\">\ub2e8\uba74 \uce58\uc218\ubcc4 \uacbd\ub3c4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uc624\uc77c \ub2f4\uae08\uc9c8 \ud6c4 \ud45c\uba74 \uacbd\ub3c4\ub294 \ubd09\uc7ac \ud06c\uae30\uac00 \ucee4\uc9c8\uc218\ub85d \ub0ae\uc544\uc9d1\ub2c8\ub2e4. 4140\uc740 \uacbd\ud654\ub2a5\uc774 \ubcf4\ud1b5 \uc218\uc900\uc774\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. \uc587\uc740 \ub2e8\uba74\uc5d0\uc11c\ub294 \ub2f4\uae08\uc9c8\ub85c \uac70\uc758 \uc644\uc804\ud55c \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8\uac00 \ud615\uc131\ub418\uc9c0\ub9cc, \ub300\ub7b5 75\u2013100 mm\ub97c \ub118\uc73c\uba74 \uc911\uc2ec\ubd80\ub294 \ub3c4\ub2ec\ud558\uc9c0 \ubabb\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>\ubd09\uc7ac \uc9c1\uacbd<\/td><td>HRC<\/td><td>HB (\uc57d)<\/td><td>\uc0c1\ud0dc<\/td><\/tr><tr><td>13 mm (0.5 in)<\/td><td>57<\/td><td>596<\/td><td>\ub2f4\uae08\uc9c8 \uc9c1\ud6c4<\/td><\/tr><tr><td>25 mm (1 in)<\/td><td>55<\/td><td>560<\/td><td>\ub2f4\uae08\uc9c8 \uc9c1\ud6c4<\/td><\/tr><tr><td>50 mm (2 in)<\/td><td>49<\/td><td>469<\/td><td>\ub2f4\uae08\uc9c8 \uc9c1\ud6c4<\/td><\/tr><tr><td>25 mm (1 in)<\/td><td>\u2014<\/td><td>335<\/td><td>540 \u00b0C \ud15c\ud37c\ub9c1<\/td><\/tr><tr><td>50 mm (2 in)<\/td><td>\u2014<\/td><td>202<\/td><td>540 \u00b0C \ud15c\ud37c\ub9c1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ub9c8\uc9c0\ub9c9 \ub450 \ud589\uc774 \ud575\uc2ec\uc785\ub2c8\ub2e4. \ub3d9\uc77c\ud55c \ud15c\ud37c\ub9c1 \uc628\ub3c4\uc5d0\uc11c 25 mm \ubd09\uc7ac\ub294 335 HB, 50 mm \ubd09\uc7ac\ub294 202 HB\uac00 \ub098\uc635\ub2c8\ub2e4. \ub2e8\uba74 \uc804\uccb4\uac00 \uacbd\ud654\ub418\uc5b4\uc57c \ud558\ub294 \ubd80\ud488\uc5d0\uc11c\ub294 \uc774 \uc218\uce58\uac00 \uac15\uc885\uc774\ub098 \uacf5\uc815\uc744 \uacb0\uc815\ud569\ub2c8\ub2e4. \ud15c\ud37c\ub9c1 \uc2dc\uac04\uc744 \ub298\ub824\ub3c4 \uc774 \ucc28\uc774\ub294 \uc881\ud600\uc9c0\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc0c1\ud0dc\ubcc4 \uacbd\ub3c4:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\uc5b4\ub2d0\ub9c1 \ucc98\ub9ac\ub428:<\/strong> 197 HB. \uc5f0\ud558\uace0 \uc808\uc0ad \uac00\uacf5\uc774 \uac00\ub2a5\ud558\uba70, \ubd09\uc7ac\uac00 \ud1b5\uc0c1 \uacf5\uae09\ub418\ub294 \uc0c1\ud0dc\uc785\ub2c8\ub2e4.<\/li>\n\n<li><strong>\ub178\uba40\ub77c\uc774\uc9d5:<\/strong> 241\u2013302 HB.<\/li>\n\n<li><strong>\uc624\uc77c \ub2f4\uae08\uc9c8 \ubc0f \ud15c\ud37c\ub9c1:<\/strong> 229\u2013341 HB, \ud15c\ud37c\ub9c1 \uc628\ub3c4\uc640 \ub2e8\uba74\uc5d0 \ub530\ub77c \uacb0\uc815\ub429\ub2c8\ub2e4.<\/li>\n\n<li><strong>\uc608\ube44 \uacbd\ud654 \uacf5\uae09:<\/strong> \ud15c\ud37c\ub9c1 \ubc94\uc704\uc758 \uc0c1\ud55c, \ub300\ub7b5 300 HB (\uc57d 30 HRC).<\/li>\n\n<li><strong>\uc720\ub3c4, \ud654\uc5fc \ub610\ub294 \uc9c8\ud654 \ud45c\uba74:<\/strong> \uacbd\ud654\uce35\uc740 \uc2ec\ubd80\ubcf4\ub2e4 \ud6e8\uc52c \ub2e8\ub2e8\ud558\uc9c0\ub9cc, \ud558\uc911 \uc6a9\ub7c9\uc740 \uc5ec\uc804\ud788 \uc2ec\ubd80\uac00 \uacb0\uc815\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-equivalent-grades\" class=\"wp-block-heading\">\uc0c1\uc751 \uac15\uc885<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ub3d9\uc77c\ud55c \uac15\uc7ac\uac00 \ub2e4\ub978 \uba85\uce6d\uc73c\ub85c \uc720\ud1b5\ub418\uba70, \ud654\ud559 \uc131\ubd84 \ud55c\uacc4\ub3c4 \ub3d9\uc77c\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uac00\uc7a5 \ub9ce\uc774 \ub2ec\ub77c\uc9c0\ub294 \ubc94\uc704\ub294 \ub9dd\uac04\uc785\ub2c8\ub2e4. AISI 4140\uc740 0.75\u20131.00%, SCM440\uc740 0.60\u20130.85%, GB 42CrMo\ub294 0.50\u20130.80%\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>\ud45c\uc900<\/td><td>\ub4f1\uae09<\/td><td>\ud654\ud559 \uc131\ubd84 (wt %)<\/td><\/tr><tr><td>ASTM A29\/A29M-03<\/td><td>4140 (G41400)<\/td><td>C 0.38\u20130.43 \u00b7 Mn 0.75\u20131.00 \u00b7 Si 0.15\u20130.35 \u00b7 Cr 0.80\u20131.10 \u00b7 Mo 0.15\u20130.25 \u00b7 P 0.035 \u00b7 S 0.040<\/td><\/tr><tr><td>SAE J404 JUN00<\/td><td>4140 (G41400)<\/td><td>C 0.38\u20130.43 \u00b7 Mn 0.75\u20131.00 \u00b7 Si 0.15\u20130.35 \u00b7 Cr 0.80\u20131.10 \u00b7 Mo 0.15\u20130.25 \u00b7 P 0.030 \u00b7 S 0.040<\/td><\/tr><tr><td>JIS G4053:2003<\/td><td>SCM 440<\/td><td>C 0.38\u20130.43 \u00b7 Mn 0.60\u20130.85 \u00b7 Si 0.15\u20130.35 \u00b7 Cr 0.90\u20131.20 \u00b7 Mo 0.15\u20130.30 \u00b7 P 0.030 \u00b7 S 0.030<\/td><\/tr><tr><td>EN 10083-1:1991<\/td><td>42CrMo4 (1.7225)<\/td><td>C 0.38\u20130.45 \u00b7 Mn 0.60\u20130.90 \u00b7 Si 0.40 max \u00b7 Cr 0.90\u20131.20 \u00b7 Mo 0.15\u20130.30 \u00b7 P 0.035 \u00b7 S 0.035<\/td><\/tr><tr><td>EN 10083-1:1991<\/td><td>42CrMoS4 (1.7227)<\/td><td>C 0.38\u20130.45 \u00b7 Mn 0.60\u20130.90 \u00b7 Si 0.40 max \u00b7 Cr 0.90\u20131.20 \u00b7 Mo 0.15\u20130.30 \u00b7 S 0.020\u20130.040<\/td><\/tr><tr><td>GB(\uc911\uad6d)<\/td><td>42CrMo<\/td><td>C 0.38\u20130.45 \u00b7 Mn 0.50\u20130.80 \u00b7 Si 0.17\u20130.37 \u00b7 Cr 0.90\u20131.20 \u00b7 Mo 0.15\u20130.25<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub294 \uac00\uc7a5 \uadfc\uc811\ud55c \uac15\uc885\uc774\uba70 \ud638\ud658 \ubd80\ud488\uc774 \uc544\ub2d9\ub2c8\ub2e4. \ub9dd\uac04\uacfc \ud669 \ubc94\uc704\uac00 \ub2e4\ub974\uace0, \uac01 \uaddc\uaca9\uc774 \ud5c8\uc6a9\ud558\ub294 \uacbd\ud654\ub2a5 \ubc94\uc704\ub3c4 \ub2e4\ub985\ub2c8\ub2e4. \ud55c \uac15\uc885\uc744 \ub2e4\ub978 \uac15\uc885\uc73c\ub85c \ub300\uccb4\ud558\uae30 \uc804\uc5d0 \uad6c\ub9e4 \uaddc\uaca9\uc758 \ud654\ud559 \uc131\ubd84 \ud5c8\uc6a9 \uc624\ucc28\uc640 \ud574\ub2f9 \ub2e8\uba74 \ud06c\uae30\uc5d0\uc11c \ubd80\ud488\uc774 \ub3c4\ub2ec\ud574\uc57c \ud558\ub294 \uacbd\ub3c4\ub97c \ud655\uc778\ud558\uc2ed\uc2dc\uc624. \ud654\ud559 \uc131\ubd84\uc744 \ucda9\uc871\ud558\ub294 \uac15\uc885\ub3c4 \uacbd\ub3c4\uc5d0\ub294 \ubbf8\ub2ec\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 id=\"h-heat-treatment\" class=\"wp-block-heading\">\uc5f4\ucc98\ub9ac<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\uc815\uaddc\ud654:<\/strong> 845\u2013925 \u00b0C\ub85c \uac00\uc5f4\ud558\uace0 \uacf5\ub7ad\ud569\ub2c8\ub2e4. \uc774\ub294 \uacbd\ud654 \ub610\ub294 \uae30\uacc4 \uac00\uacf5 \uc804\uc5d0 \uacb0\uc815\ub9bd\uc744 \ubbf8\uc138\ud654\ud558\uace0 \uc870\uc9c1\uc744 \uade0\uc77c\ud558\uac8c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\uac00\uc5f4 \ub0c9\uac01:<\/strong> 830\u2013870 \u00b0C\ub85c \uac00\uc5f4\ud558\uc5ec \uc720\uc9c0\ud55c \ud6c4 \uc57d 15 \u00b0C\/h\ub85c 480 \u00b0C\uae4c\uc9c0 \ub178\ub0c9\ud558\uace0 \uacf5\ub7ad\ud569\ub2c8\ub2e4. \uacb0\uacfc\ub294 197 HB \ubd80\uadfc\uc758 \uc5f0\ud558\uace0 \uc808\uc0ad \uac00\uacf5\uc774 \uac00\ub2a5\ud55c \uc870\uc9c1\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\uacbd\ud654:<\/strong> 830\u2013870 \u00b0C\uc5d0\uc11c \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ud654\ud558\uace0 \uc624\uc77c\uc5d0\uc11c \ub2f4\uae08\uc9c8\ud569\ub2c8\ub2e4. \uc624\uc77c\uc774 \ud45c\uc900\uc785\ub2c8\ub2e4. \uc218\ub0c9\uc740 \ubcf5\uc7a1\ud55c \ud615\uc0c1\uc5d0\uc11c \uade0\uc5f4 \uc704\ud5d8\uc744 \ub192\uc5ec \uac70\uc758 \uc0ac\uc6a9\ub418\uc9c0 \uc54a\uc73c\uba70, \uc0ac\uc6a9\ud560 \uacbd\uc6b0 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ud654 \uc628\ub3c4\ub97c 815\u2013845 \u00b0C\ub85c \ub0ae\ucda5\ub2c8\ub2e4. \ucd5c\uc18c 1\uc2dc\uac04 \ub610\ub294 \ub2e8\uba74 25 mm\ub2f9 15\u201320\ubd84 \uc720\uc9c0\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ub2f4\uae08\uc9c8:<\/strong> \ub450 \uac00\uc9c0 \ubc94\uc704\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \ucd5c\ub300 \uac15\ub3c4\ub97c \uc704\ud574\uc11c\ub294 175\u2013230 \u00b0C, \uadf8 \uc678\uc5d0\ub294 385\u2013705 \u00b0C\ub85c \ud56d\ubcf5\uac15\ub3c4 1380 MPa \ubbf8\ub9cc\uae4c\uc9c0 \uac00\ub2a5\ud569\ub2c8\ub2e4. \ucd5c\uc885 \ud2b9\uc131\uc740 \ub2f4\uae08\uc9c8\uc774 \uc544\ub2c8\ub77c \ud15c\ud37c\ub9c1 \uc628\ub3c4\uac00 \uacb0\uc815\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ucde8\uc131\ud654 \ud6a8\uacfc \uc911 \ub450 \uac00\uc9c0\ub294 \uc8fc\ubaa9\ud560 \ub9cc\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\uac15\ud654\ub41c \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8 \ucde8\uc131<\/strong> \u2014 4140\uc740 \ud1b5\uc0c1 230\u2013370 \u00b0C(\uccad\uc5f4\ucde8\uc131 \uad6c\uac04)\uc5d0\uc11c \ud15c\ud37c\ub9c1\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc774 \uad6c\uac04\uc5d0\uc11c\ub294 \ucda9\uaca9 \uc778\uc131\uc774 \uae09\uaca9\ud788 \ub5a8\uc5b4\uc9c0\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/li>\n\n<li><strong>\uac00\uc5ed\uc801 \ud15c\ud37c \ucde8\uc131<\/strong> \u2014 \uace0\uc628 \ud15c\ud37c\ub9c1 \ud6c4 375\u2013575 \u00b0C\ub97c \uac70\uce58\uba70 \uc11c\uc11c\ud788 \ub0c9\uac01\ub418\ub294 \ub450\uaebc\uc6b4 \ub2e8\uba74\uc5d0\uc11c \ubc1c\uc0dd\ud560 \uc218 \uc788\uc73c\uba70, \uc778 \ubc0f \uc720\uc0ac \ubd88\uc21c\ubb3c\uacfc \uad00\ub828\uc774 \uc788\uc2b5\ub2c8\ub2e4. 4140\uc758 \ubab0\ub9ac\ube0c\ub374\uc740 \uc774\ub7ec\ud55c \uacbd\ud5a5\uc744 \uac10\uc18c\uc2dc\ud0a4\uba70, \ud15c\ud37c\ub9c1 \uc628\ub3c4\uc5d0\uc11c\uc758 \ub354 \ube60\ub978 \ub0c9\uac01\uc740 \uc774\ub97c \ucd94\uac00\ub85c \uc5b5\uc81c\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-welding-4140\" class=\"wp-block-heading\">4140\uc758 \uc6a9\uc811<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">4140\uc740 \uc0ac\uc804 \uc778\uc99d\ub41c \uc6a9\uc811\uc6a9 \uac15\uc7ac\uac00 \uc544\ub2d9\ub2c8\ub2e4. \uc811\ud569\ubd80\uc5d0 \ub300\ud55c \uc6a9\uc811 \uc808\ucc28\uc11c\ub97c \uc791\uc131\ud558\uace0 \uc778\uc99d\ud574\uc57c \ud558\uba70, \uc544\ub798 \ub124 \uac00\uc9c0 \uc81c\uc5b4 \uc0ac\ud56d\uc740 \uc120\ud0dd \uc0ac\ud56d\uc774 \uc544\ub2d9\ub2c8\ub2e4.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ub9c8\ub974\ud150\uc0ac\uc774\ud2b8 \uc2dc\uc791 \uc628\ub3c4 \uc774\uc0c1\uc73c\ub85c \uc608\uc5f4: <strong>290 \u00b0C (550 \u00b0F)<\/strong>. \ud574\ub2f9 \uc218\uc900 \uc774\uc0c1\uc5d0\uc11c\ub294 \uc5f4\uc601\ud5a5\ubd80\uac00 \ubbf8\ud15c\ud37c\ub9c1 \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8 \ub300\uc2e0 \ubca0\uc774\ub098\uc774\ud2b8\ub85c \ubcc0\ud0dc\ud558\uba70, \uc774\uac83\uc774 \uade0\uc5f4\uc758 \uc6d0\uc778\uc785\ub2c8\ub2e4.<\/li>\n\n<li>\uc608\uc5f4 \uc628\ub3c4\ub97c \uce35\uac04 \uc628\ub3c4\ub85c \uc720\uc9c0\ud558\uc2ed\uc2dc\uc624. \ubd80\ud488\uc774 \uc774 \uc628\ub3c4 \uc544\ub798\ub85c \ub5a8\uc5b4\uc9c0\uba74 \uc911\ub2e8\ud558\uace0 \uc7ac\uac00\uc5f4\ud558\uc2ed\uc2dc\uc624.<\/li>\n\n<li>\uc800\uc218\uc18c \uacf5\uc815\uacfc \uc800\uc218\uc18c \uc6a9\uc811 \uc7ac\ub8cc\ub294 \ud544\uc218\uc785\ub2c8\ub2e4. \uc218\uc18c\ub294 \uc800\uc628 \uade0\uc5f4\uc758 \ub610 \ub2e4\ub978 \uc6d0\uc778\uc785\ub2c8\ub2e4.<\/li>\n\n<li>\ud6c4\uc5f4\uc740 \ubd80\ud488\uc5d0 \uc801\uc6a9\ub41c \ud15c\ud37c\ub9c1 \uc628\ub3c4\ubcf4\ub2e4 28 \u00b0C (50 \u00b0F) \uc774\uc0c1 \ub192\uc9c0 \uc54a\uac8c \ud558\uc2ed\uc2dc\uc624. \ubbf8\ud15c\ud37c\ub9c1 \uc5f4\uc601\ud5a5\ubd80\ub97c \uc2e4\uc628\uc73c\ub85c \ub0c9\uac01\ud558\ub294 \uac83\uc774 \ubc14\ub85c \ubcf4\uc218\ub97c \uade0\uc5f4\ub85c \ubc14\uafb8\ub294 \uc6d0\uc778\uc785\ub2c8\ub2e4.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-machining-4140\" class=\"wp-block-heading\">4140\uc758 \uc808\uc0ad \uac00\uacf5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">187\u2013229 HB\uc758 \uc5b4\ub2d0\ub9c1 \uc0c1\ud0dc\uc5d0\uc11c 4140\uc740 AISI 1212\ub97c 100%\ub85c \ubcfc \ub54c \uc57d <strong>65%<\/strong> \uc758 \uc808\uc0ad \uc18d\ub3c4\ub85c \uac00\uacf5\ub429\ub2c8\ub2e4. \uc774\ub294 \uc77c\ubc18\uc801\uc778 \ud569\uae08\uac15 \ub4f1\uae09\uc774\uba70 \uc5b4\ub824\uc6b4 \ub4f1\uae09\uc774 \uc544\ub2d9\ub2c8\ub2e4 \u2014 \uacbd\ub3c4 \uc0c1\ud0dc\uac00 \uc218\uce58\ub97c \ubcc0\ud654\uc2dc\ud0b5\ub2c8\ub2e4.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\uc5b4\ub2d0\ub9c1 (187\u2013229 HB): \uac00\uc7a5 \ube60\ub978 \uc0c1\ud0dc\uc774\uba70, \uc774\ud6c4 \uc5f4\ucc98\ub9ac\ub418\ub294 \ubd80\ud488\uc758 \uacbd\uc6b0 \uc774 \uc0c1\ud0dc\uc5d0\uc11c \uac00\uacf5\ud558\uc2ed\uc2dc\uc624.<\/li>\n\n<li>\ub2f4\uae08\uc9c8 \ubc0f \ud15c\ud37c\ub9c1 (229\u2013341 HB): \ub0ae\uc740 \uc18d\ub3c4, \ub354 \uac15\uc131\uc778 \uc14b\uc5c5, \ub354 \ub9ce\uc740 \uacf5\uad6c \ub9c8\ubaa8. \uc608\ube44 \uacbd\ud654 \uc0c1\ud0dc\uc5d0\uc11c \uac00\uacf5\ud558\uba74 \uc774\ud6c4 \uc5f4\ucc98\ub9ac\ub85c \uc778\ud55c \ubcc0\ud615\uacfc \uc2a4\ucf00\uc77c\uc744 \ud53c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n\n<li>4140\uc73c\ub85c \uc808\uc0ad \uac00\uacf5\ub418\ub294 \uc77c\ubc18\uc801\uc778 \ubd80\ud488: \ucee4\ub125\ud305 \ub85c\ub4dc, \ud06c\ub7ad\ud06c\uc0e4\ud504\ud2b8, \uc2a4\ud2f0\uc5b4\ub9c1 \ub108\ud074, \uc561\uc2ac, \uae30\uc5b4, \uc2a4\ud130\ub4dc, \uace0\uac15\ub3c4 \ubcfc\ud2b8, \uacf5\uad6c \ud640\ub354 \ubc0f \uc0dd\ud06c.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-4140-or-a-tool-steel\" class=\"wp-block-heading\">4140 \ub610\ub294 \uacf5\uad6c\uac15? \uc6a9\ub3c4\uc5d0 \ub9de\ub294 \uc7ac\uc9c8 \uc120\ud0dd\ud558\uae30<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">4140\uacfc \uacf5\uad6c\uac15\uc740 \uc77c\ubd80 \uacbd\ub3c4 \ubc94\uc704\uc5d0\uc11c \uacb9\uce58\ubbc0\ub85c \uac00\uaca9\ub9cc\uc73c\ub85c \uc11c\ub85c \ub300\uccb4\ud558\ub824\ub294 \uc720\ud639\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc62c\ubc14\ub978 \uc120\ud0dd\uc740 \ubd80\ud488\uc774 \uacac\ub38c\uc57c \ud558\ub294 \uc870\uac74\uc5d0\uc11c \ube44\ub86f\ub429\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4140\uc740 \ubd80\ud488\uc774 \uc808\uc0ad\uc774\ub098 \ub9c8\ubaa8\ubcf4\ub2e4 \ud558\uc911\uacfc \ud53c\ub85c\ub97c \ubc1b\ub294 \uacbd\uc6b0 \ub354 \ub098\uc740 \uc120\ud0dd\uc785\ub2c8\ub2e4: \uc0e4\ud504\ud2b8, \uae30\uc5b4, \uc544\ubc84, \ud640\ub354, \ubcfc\uc2a4\ud130 \ubc0f \uad6c\uc870\uc6a9 \uae30\uacc4 \ubd80\ud488. \uacf5\uad6c\uac15\ubcf4\ub2e4 \uc778\uc131\uc774 \ub192\uace0 \ud6e8\uc52c \uc800\ub834\ud558\uba70, \uc6a9\uc811\uc774 \ub354 \uc6a9\uc774\ud558\uace0, \ub354 \ub2e4\uc591\ud55c \ud06c\uae30\uc640 \ud615\ud0dc\ub85c \uacf5\uae09\ub429\ub2c8\ub2e4. \uadf9\ud55c\uc758 \ub9c8\ubaa8 \uc218\uba85\uacfc 58+ HRC\uac00 \uc694\uad6c\ub418\uc9c0 \uc54a\ub294\ub2e4\uba74 \uacf5\uad6c\uac15\uc5d0 \ube44\uc6a9\uc744 \uc9c0\ubd88\ud558\ub294 \uac83\uc740 \uc544\ubb34 \uc774\ub4dd\uc774 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uacf5\uad6c\uac15\uc740 \ud30c\uc190 \ubaa8\ub4dc\uac00 \ub9c8\ubaa8, \ub0a0 \uc720\uc9c0\ub825 \ub610\ub294 \uc5f4\uc778 \uacbd\uc6b0 \uc62c\ubc14\ub978 \uc120\ud0dd\uc785\ub2c8\ub2e4. 4140\uc740 \uace0\ud0c4\ud654\ubb3c \ub4f1\uae09\ub9cc\ud07c \uc808\uc0ad \ub0a0\uc744 \uc720\uc9c0\ud558\uac70\ub098 \uc5f0\ub9c8\uc131 \ub2e4\uc774 \ub9c8\ubaa8\uc5d0 \uc800\ud56d\ud558\uc9c0 \ubabb\ud558\uba70, \uc57d 400 \u00b0C \uc774\uc0c1\uc5d0\uc11c \uac15\ub3c4\uac00 \ube60\ub974\uac8c \uc800\ud558\ub429\ub2c8\ub2e4. \uc138 \uac00\uc9c0 \uacbd\uacc4\ub97c \uba85\ud655\ud788 \uadf8\uc744 \uac00\uce58\uac00 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\uc808\uc0ad \ubc0f \ube14\ub7ad\ud0b9 \uacf5\uad6c<\/strong> 4140\uc774 \uac16\uc9c0 \ubabb\ud55c \uacbd\ub3c4 (60+ HRC)\uc640 \ud0c4\ud654\ubb3c \ubd80\ud53c\uac00 \ud544\uc694\ud569\ub2c8\ub2e4. D2 \ub610\ub294 A2\ub294 \ub9c8\ubaa8 \ub2e4\uc774\uc5d0\uc11c \ud6e8\uc52c \uc624\ub798 \uc9c0\uc18d\ub429\ub2c8\ub2e4.<\/li>\n\n<li><strong>~400 \u00b0C \uc774\uc0c1\uc758 \uc5f4\uac04 \uac00\uacf5 \uacf5\uad6c<\/strong> 4140\uc774 \uac16\uc9c0 \ubabb\ud55c H13\uc758 \uace0\uc628 \uacbd\ub3c4\uac00 \ud544\uc694\ud569\ub2c8\ub2e4.<\/li>\n\n<li><strong>58HRC \uc774\uc0c1\uc758 \uacbd\ub3c4\ub97c \uacac\ub38c\uc57c \ud558\ub294 \ubaa8\ub4e0 \ubd80\ud488<\/strong> \uc2e4\uc81c \ub2e8\uba74\uc5d0\uc11c\uc758 \uc774\ub294 4140\uc5d0\uac8c \ubd88\uac00\ub2a5\ud55c\ub370, \ud574\ub2f9 \ub2e8\uba74 \ud06c\uae30\uc5d0\uc11c \uc548\uc815\uc801\uc73c\ub85c \ub3c4\ub2ec\ud560 \uc218 \uc5c6\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>\uc131\uc9c8<\/td><td>4140<\/td><td>D2<\/td><td>H13<\/td><td>A2<\/td><\/tr><tr><td>\ucd5c\ub300 \uacbd\ub3c4(\uc2e4\uc81c)<\/td><td>~50\u201355 HRC<\/td><td>58\u201362 HRC<\/td><td>44\u201352 HRC<\/td><td>57\u201362 HRC<\/td><\/tr><tr><td>\ub0b4\ub9c8\ubaa8\uc131<\/td><td>\ub0ae\uc740<\/td><td>\ud6cc\ub96d\ud55c<\/td><td>\ubcf4\ud1b5\uc758<\/td><td>\uc88b\uc740<\/td><\/tr><tr><td>\uace0\uc628 \uacbd\ub3c4<\/td><td>\ub0ae\uc74c (400 \u00b0C \ubbf8\ub9cc)<\/td><td>\ub0ae\uc740<\/td><td>\uc6b0\uc218 (~600 \u00b0C\uae4c\uc9c0)<\/td><td>\ub0ae\uc740<\/td><\/tr><tr><td>\uc778\uc131<\/td><td>\uc88b\uc740<\/td><td>\ubcf4\ud1b5\uc758<\/td><td>\uc88b\uc740<\/td><td>\ubcf4\ud1b5\uc758<\/td><\/tr><tr><td>\uc0c1\ub300\uc801 \ube44\uc6a9<\/td><td>\ub0ae\uc740<\/td><td>\ub192\uc740<\/td><td>\ub192\uc740<\/td><td>\uc911\uc0c1<\/td><\/tr><tr><td>\ucd08\uacbd \ud569\uae08 \ubd80\ud53c<\/td><td>\uc5c6\uc74c<\/td><td>\ub192\uc740 (\ud06c\ub86c \ud0c4\ud654\ubb3c)<\/td><td>\ub0ae\uc74c(\ud569\uae08 \ud0c4\ud654\ubb3c)<\/td><td>\uc911\uac04 \uc815\ub3c4 (\ud06c\ub86c \ud0c4\ud654\ubb3c)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 id=\"h-standards-and-references\" class=\"wp-block-heading\">\ud45c\uc900 \ubc0f \ucc38\uace0 \uc790\ub8cc<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">4140 \ubc0f \uadf8 \ub4f1\uac00\uc7ac\ub294 ASTM A29\/A29M \ubc0f SAE J404 (\ubd09\uc7ac\uc758 \ud654\ud559 \uc870\uc131), ASTM A322 (\ube4c\ub9bf \ubc0f \ubd09\uc7ac), EN 10083-1 (42CrMo4), JIS G4053 (SCM440) \ubc0f GB\/T 3077 (42CrMo)\uc5d0 \uaddc\uc815\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. \uc778\uc99d\ub41c \uae30\uacc4\uc801 \uc131\uc9c8\uc740 \ud56d\uc0c1 \uba85\uc2dc\ub41c \ud45c\uc900, \ub2e8\uba74 \ud06c\uae30 \ubc0f \uc2dc\ud5d8 \uc704\uce58\uc640 \uc5f0\uacc4\ub418\uc5b4\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \ud398\uc774\uc9c0\uc758 \ub370\uc774\ud130:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\uae30\uacc4\uc801 \uc131\uc9c8 \ubc0f \uc5f4\ucc98\ub9ac \uc2e4\ubb34 \u2014 ASM Handbook Vol. 4, Heat Treating, 4140 \ud56d\ubaa9.<\/li>\n\n<li>\ub2e8\uba74 \ud06c\uae30\ubcc4 \uacbd\ub3c4, \uc5b4\ub2d0\ub9c1 \/ \ub178\uba40\ub77c\uc774\uc9d5 \/ \ud15c\ud37c\ub9c1 \ubc94\uc704, \uc808\uc0ad\uc131 \ub4f1\uae09 \u2014 Cutting Data for Turning of Steel, AISI 4140 \uc7a5.<\/li>\n\n<li>\ub4f1\uac00 \ub4f1\uae09 \ubc0f \ud654\ud559 \uc870\uc131 \u2014 Handbook of Comparative World Steel Standards (ASTM DS 67B), Cr-Mo \uac15 \ud45c.<\/li>\n\n<li>\uc6a9\uc811 \uc2e4\ubb34 \u2014 ASM Handbook Vol. 6, Welding, Brazing and Soldering.<\/li>\n\n<li>AISI 4140 \ucc38\uace0 \uce74\ub4dc, PDF 2\ud398\uc774\uc9c0, 414 KB. PDF\ub294 \uc601\uc5b4\ub85c \uc81c\uacf5\ub429\ub2c8\ub2e4. \ub3d9\uc77c\ud55c \ud45c\ub97c \uc778\uc1c4\uc6a9\uc73c\ub85c \uc81c\uacf5\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\uad00\ub828 \uc790\ub8cc:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/aobosteel.com\/ko\/4140-vs-h13\/\">4140 \uacf5\uad6c\uac15 vs H13 \uacf5\uad6c\uac15<\/a><\/li>\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/d2-steel-vs-4140\/\">4140 vs D2 \uacf5\uad6c\uac15<\/a><\/li>\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/4140-vs-a2-tool-steel\/\">4140 vs A2 \uacf5\uad6c\uac15<\/a><\/li>\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/scm415-alloy-steel\/\">SCM415 \ud569\uae08\uac15<\/a><\/li>\n\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/4340-steel-properties\/\">4340 \uac15\uc7ac \ud2b9\uc131 \ubc0f \uc5f4\ucc98\ub9ac<\/a><\/li>\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<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>4140 (42CrMo4 \/ SCM440) chromium-molybdenum steel: tempering response to 705 \u00b0C, hardness by section size, equivalent grades, welding and machinability.<\/p>","protected":false},"author":1,"featured_media":0,"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":"","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":"default","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-24959","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - 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