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USA UNS G41400
SAE
Steel Number		 4140
Corresponding Standard SAE J404-2000
Chemical Compositions of SAE Alloy Steels
Brand/Supplier
-> POSCO
-> BAOSTEEL
Classification Alloy Steel
Chemical Element Composition Content (%)
  Component C Si Mn P S Cr Mo
本标准 Minimum Value 0.38 0.15 0.75 - - 0.8 0.15
Maximum Value 0.43 0.35 1 0.03 0.04 1.1 0.25
Mechanical Properties
product form Heat Treatment or Condition
Hardness
HBW
Hot-rolled steel plate (Baosteel) Hot Rolling HV
≤320
Hot-rolled steel plate (Baosteel) Annealing HV
≤180
Hot-rolled steel plate (Baosteel) Water Quenching 800~880℃ HRC
≥52
Hot-rolled steel plate (Baosteel) Oil Quenching 830~890℃ HRC
≥50
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 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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