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钢材成分表

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Chapter 5- Selected Steels in Three Countries [US(AISI/SAE), Japan(JIS) and China(GB)] USA Japan China

SAE JIS GB C

P S Si Ni Cr Mo 1015 S15C 15 0.13/.18 0.30/.60 0.04max 0.04max 0.07max - - - 1045 S45C 45 0.43/.50 0.50/.80 0.04max 0.04max 0.17/0.37 - - 1050 S50C 50

0.47/.55 0.50/.80 0.04max 0.04max 0.17/0.37 - - -

1212 SUM21 Y12 0.08/.16 0.70/1.0 0.04max 0.16/.23 0.15max - - - 1213 SUM22 Y12 0.13max 0.70/1.0 0.04max 0.16/.23 0.15max - - - 12L14 - Y12Pb 0.15max 0.85/1.15 0.04/.09 0.26/.35 0.15max Pb0.15/0.35 - - 1144

fatigue-

proof

- Y40Mn 0.40/.48 1.35/1.65 0.04max 0.24/.33 0.15/0.30

4120 SCM420 20CrMo 0.18/.23 0.60/.85 0.04max 0.04max 0.15/0.35 - 0.80/1.10 0.15/.30 4135 SCM435 35CrMo 0.33/.38 0.60/.85 0.04max 0.04max 0.15/0.35 - 0.80/1.10 0.15/.30 4140 SCM440 42CrMo 0.38/.43 0.60/.85 0.04max 0.04max 0.15/0.35 - 0.80/1.10 0.15/.30

4150 SCM445

50CrMo**

0.40/.50 0.60/.85 0.04max 0.04max 0.15/0.35 - 0.80/1.10 0.15/.30

SAE JIS GB C Mn P S Si Ni Cr Mo 5120 SCR420 20Cr 0.18/.23 0.60/.85 0.04max 0.04max 0.15/0.35 - 0.70/.90 - 5140 SCR440 40Cr 0.38/.43 0.60/.85 0.04max 0.04max 0.15/0.35 - 0.70/.90 - 8620 SCNM220 20CrNiMo 0.18/.23 0.60/.85 0.04max 0.04max 0.15/0.35 0.40/.70 0.40/.65 0.15/.30 8630 SCNM230 30CrNiMo 0.28/.33 0.60/.85 0.04max 0.04max 0.15/0.35 0.40/.70 0.40/.65 0.15/.30 8640 SCNM240 40CrNiMo 0.38/.43 0.75/1.0 0.04max 0.04max 0.15/0.35 0.40/.70 0.40/.65 0.15/.30 4320 SCNM419 -- 0.18/.23 0.60/.85 0.03max 0.03max 0.15/0.35 1.60/2.00 0.60/1.00 0.15/.30 4330 SCNM431 -- 0.28/.33 0.60/.85 0.03max 0.03max 0.15/0.35 1.60/2.00 0.60/1.00 0.15/.30 4340 SCNM439 -- 0.38/.43 0.60/.85 0.03max 0.03max 0.15/0.35 1.60/2.00 0.60/1.00 0.15/.30

6150 SUP10 50CrVA 0.48/.53 0.60/.85 0.03max 0.03max 0.15/0.35 - 0.80/1.10 V

0.15Min

52100 SUJ2 GCr15 0.98/1.10 0.25/.45 0.03max 0.03max 0.15/0.35 - 1.35/1.65

W1-0.7C

or 1070

SK7 T7 0.70/.80 <0.50 0.03max 0.03max <0.35 - - -

W1-0.9C

or 1090

SK5 T8 or T9 0.80/.90 <0.50 0.03max 0.03max <0.35 - - - W1-1.0C SK3 T10 1.00/1.10 <0.50 0.03max 0.03max <0.35 - - -

* SAE does not have 4115, closest one is 4118, with a little higher carbon content of 0.18%.

** GB does not have 50CrMo, closest one is 42CrMo, with a little lower carbon content of 0.42%.

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