50CrMo - GB /T 17107-1997

Grade	50CrMo
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
Classification	Alloy Steel

50CrMo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.46	0.17	0.5	-	-	0.9	-	-	0.15
Maximum Value	0.54	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

50CrMo 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 %
d≤100	Sample Direction: Longitudinal	Tempering	≥900	≥700	≥12	≥50
100＜d≤160	Sample Direction: Longitudinal	Tempering	≥850	≥650	≥13	≥50
160＜d≤250	Sample Direction: Longitudinal	Tempering	≥800	≥550	≥14	≥50
250＜d≤500	Sample Direction: Longitudinal	Tempering	≥740	≥540	≥14	-
500＜d≤750	Sample Direction: Longitudinal	Tempering	≥690	≥490	≥15	-

• 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	International Organization for Standardization	Germany		European Standard		United Kingdom
GB	JIS	ASTM	ISO	W-Nr.	L-Nr.	EN	Numerical Grade	BS EN/BS
50CrMo	SCM445	4150	50CrMo4	50CrMo4	1.7228	50CrMo4	1.7228	708M40 708M50

50CrMo Corresponding Standards(Same grade name, different standards)

1	GB /T 17107-1997
	50CrMo
2	GB /T 3077-2015
	50CrMo A30502
3	JB /T 6396-2006
	50CrMo
4	GB /T 37601-2019
	50CrMo

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