42CrMo - GB /T 18248-2021

Grade	42CrMo
Corresponding Standard	GB /T 18248-2021 Seamless steel tubes for gas cylinder
Classification	Alloy Steel

42CrMo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	More
Minimum Value	0.38	0.17	0.5	-	-	0.9	-	-	0.15	P+S≤0.025；V+Nb+Ti+B+Zr≤0.15ⓐ
Maximum Value	0.45	0.37	0.8	0.02	0.01	1.2	0.3	0.2	0.25	P+S≤0.025；V+Nb+Ti+B+Zr≤0.15ⓐ

42CrMo Mechanical Properties

condition	Test Temperature	Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
Steel pipe specimen	Room Temperature	Ⅰ	830~870°C Quenching (Normalizing), Oil Cooling + 510~610°C Tempering, Water, Oil Cooling	≥1080	≥930	≥12	≥27(-50°C)
Steel pipe specimen	Room Temperature	Ⅱ	Tempering	≥930	≥760	≥14②
Steel pipe outer diameter D＞140mm; t=3*~5, Transverse		Ⅱ	Tempering				≥30③；≥24④
Steel pipe outer diameter D＞140mm; t=5~7.5, Transverse		Ⅱ	Tempering				≥35③；≥28④
Steel pipe outer diameter D＞140mm; t=7.5~10, Transverse		Ⅱ	Tempering				≥40③；≥32④
Steel pipe outer diameter D≤140mm; t=3~10, Longitudinal		Ⅱ	Tempering				≥60③；≥48④

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

ISC

CNS

JIS

ASTM/AISI

UNS

ISO

DIN EN/DIN

W-Nr.

NF EN/NF

Numerical Grade

SS₁₄

BS EN/BS

42CrMo

A30422

SCM440

SCM440
SCM440H

SCM440

4140
4142

G41400
G41420

42CrMo4

1.7225

42CD4

42CrMo4

1.7225

2244

708M40

2 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

3 Approximate Comparison Table Structural Alloy Steel

China	United States
GB	ASTM
42CrMo	A193 B7

42CrMo Corresponding Standards(Same grade name, different standards)

1	GB /T 3077-1999
	42CrMo A30422
2	GB /T 17107-1997
	42CrMo
3	GB /T 3077-2015
	42CrMo A30422
4	Q/BQB 517-2018
	42CrMo
5	GB /T 3078-2019
	42CrMo
6	JB /T 6396-2006
	42CrMo
7	GB /T 18248-2021
	42CrMo
8	GB /T 41157.1-2022
	42CrMo 42CM
9	GB /T 41157.2-2022
	42CrMo 42CM
10	JB /T 6908-2020
	42CrMo A30422
11	GB /T 37601-2019
	42CrMo

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!