4130 - ASTM A 646/A646M-2024

Grade	4130
ASTM Specification or Grade	Grade 11
Corresponding Standard	ASTM A646/A646M-2024 Standard Specification for Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings
Classification	Alloy Steel

4130 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo
Minimum Value	0.28	0.2	0.4	-	-	0.8	0.15
Maximum Value	0.33	0.35	0.6	0.015	0.012	1.1	0.25

* If any of the following elements are not specified, the following maximum limits shall apply: Nickel 0.35 %; Chromium 0.20 %; Molybdenum 0.06 %; Copper 0.35 %

4130 Mechanical Properties

Heat Treatment or Condition	Hardness HBW
Annealing	≤235

1 Approximate Comparison Table Structural Alloy Steel

China		Japan	United States	Germany			France	European Standard		Russia	Sweden
YB	ISC	JIS	ASTM	DIN EN/DIN	W-Nr.	L-Nr.	NF EN/NF	EN	Numerical Grade	GOST	SS₁₄
25CrMo	A30252	SCM430	4130	25CrMo4	1.7218	1.7214	25CD4	25CrMo4	1.7218	30ХМ	2225

2 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

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

4130 Corresponding Standards(Same grade name, different standards)

1	ASTM A29/A29M-2012
	4130 G41300
2	ASTM A29/A29M-2005
	4130 G41300
3	SAE J404-2000
	4130 G41300
4	ASTM A29/A29M-2020
	4130 G41300
5	ASTM A866-2014
	4130
6	ASTM A646/A646M-2024
	4130 Grade 11

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