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USA UNS G41400
ASTM
Specification or Grade		 4140
Corresponding Standard ASTM A29/A29M-2020
General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
Classification Alloy Steel
Properties Strength Impact Toughness Quench Hardness
Chemical Element Composition Content (%)
Component C Si ① Mn P S Cr Ni ② Cu ② Mo
Minimum Value 0.38 0.15 0.75 - - 0.8 - - 0.15
Maximum Value 0.43 0.35 1 0.035 0.04 1.1 0.25 0.35 0.25
1 Approximate Comparison Table Structural Alloy Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade SS14 BS EN/BS
42CrMo A30422 SCM440 SCM440
SCM440H 		SCM440 4140
4142 		G41400
G41420 		42CrMo4 42CrMo4 1.7225 42CD4 42CrMo4 1.7225 2244 708M40
2 Approximate Comparison Table Cold Heading Steel
China United States International Organization for Standardization Germany France
GB ISC ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF
ML42CrMo A30424 4140
A320ML7M 		G41400 42CrMo4E
(C32) 		42CrMo4 1.7225 42CD4
3 Approximate Comparison Table Alloy Steel for Quenching and Tempering
United States International Organization for Standardization Germany France European Standard
ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade
4140 42CrMoS4 42CrMoS4 42CD4u 42CrMoS4 1.7227
4 Approximate Comparison Table Structural Alloy Steel
China Japan United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
42CrMo SCM440H 4140
4142 		42CrMo4 42CrMo4 42CD4 42CrMo4 1.7225 35KHM
38KHM 		2244 708M40
CFS11
5 Approximate Comparison Table Structural Alloy Steel
Japan United States
JIS ASTM AISI
SNB7 A193 B7 4140
4142
4145
6 Approximate Comparison Table Structural Alloy Steel
Japan United States Germany France European Standard Russia United Kingdom
JIS ASTM/AISI UNS DIN EN/DIN W-Nr. NF EN/NF EN GOST BS EN/BS
SCM440 4140
4142
6135 		G41400 41CrMo4 1.7223 42CD4TS 41CrMo 40ХФА
40KHFA 		3111-5/1
42CrMo4
708M40

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