25CrMo - GB /T 17107-1997

Grade	25CrMo
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
Classification	Alloy Steel

25CrMo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.22	0.17	0.5	-	-	0.9	-	-	0.15
Maximum Value	0.29	0.37	0.8	0.035	0.035	1.2	0.3	0.3	0.3

• 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

25CrMo 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 %
17≤d≤40	Sample Direction: Longitudinal	Tempering	≥780	≥600	≥14	≥55
40＜d≤100	Sample Direction: Longitudinal	Tempering	≥690	≥450	≥15	≥60
100＜d≤160	Sample Direction: Longitudinal	Tempering	≥640	≥400	≥16	≥60

• 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.

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

25CrMo Corresponding Standards(Same grade name, different standards)

1	GB /T 17107-1997
	25CrMo
2	GB /T 3077-2015
	25CrMo A30252
3	JB /T 6396-2006
	25CrMo
4	GB /T 37601-2019
	25CrMo

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