30CrMo - GB /T 17107-1997

Grade	30CrMo
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
Classification	Alloy Steel

30CrMo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.26	0.17	0.4	-	-	0.8	-	-	0.15
Maximum Value	0.34	0.37	0.7	0.035	0.035	1.1	0.3	0.3	0.25

• High-quality steel——P≤0.035；S≤0.035；Cu≤0.3；Cr≤0.3；Ni≤0.3
• Extra-quality steel （Suffix A）——P≤0.025；S≤0.025；Cu≤0.25；Cr≤0.3；Ni≤0.3
• Special High-Quality Steel (Suffix E)——P≤0.025；S≤0.015；Cu≤0.25；Cr≤0.3；Ni≤0.3

30CrMo Mechanical Properties

diameter or thickness d mm	Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
d≤100	Sample Direction: Longitudinal	Tempering	≥620	≥410	≥16	≥40	196~240	≥49
100＜d≤300	Sample Direction: Longitudinal	Tempering	≥590	≥390	≥15	≥40	196~240	≥44

• The forgings must be inspected for mechanical properties after performance heat treatment and before any surface treatment.
• After the samples are removed, no heat treatments that affect the mechanical properties or any processing that influences the test results shall be conducted.
• Mechanical property testing primarily evaluates the material\'s tensile strength, impact resistance, and hardness. When conducting tensile, impact, and hardness tests simultaneously, the hardness value is for reference only. Alternatively, one may choose to perform only one of the tensile, impact, or hardness tests.

1 Approximate Comparison Table structural alloy steel

China		Taiwan, China	Japan	South Korea	United States	France	European Standard
GB	ISC	CNS	JIS	KS	ASTM	NF EN/NF	EN
30CrMo	A30302	SCM430	SCM430	SCM430	4130	30CD4	34CrMo4

2 Approximate Comparison Table

China		Japan	International Organization for Standardization	European Standard
GB	ISC	JIS	ISO	EN	Numerical Grade
30CrMo	A30302	SCM425 SCM425H	25CrMo4	25CrMo4	1.7218

3 Approximate Comparison Table structural alloy steel

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	SAE	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
30CrMo	SCM420 SCM430	4130	25CrMo4	25CrMo4	25CD4	25CrMo4	1.7218	20KHM 30KHM 30KHMA	2225	708A25 708M25 CFS10

4 Approximate Comparison Table structural alloy steel

China	United States
GB	ASTM/AISI
30CrMo	A519 Gr4130

30CrMo Corresponding Standards(Same grade name, different standards)

1	GB /T 3077-1999
	30CrMo A30302
2	GB /T 17107-1997
	30CrMo
3	GB /T 3077-2015
	30CrMo A30302
4	GJB 1220A-2008
	30CrMo
5	GB /T 3078-2019
	30CrMo
6	NB /T 47008-2017
	30CrMo
7	GB /T 18248-2021
	30CrMo
8	GB /T 37601-2019
	30CrMo

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