50Cr - GB /T 17107-1997

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

50Cr Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.47	0.17	0.5	-	-	0.8	-	-
Maximum Value	0.54	0.37	0.8	0.035	0.035	1.1	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

50Cr 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
d≤100	Sample Direction: Longitudinal	Tempering	≥835	≥540	≥10	≥40	241~286
100＜d≤300	Sample Direction: Longitudinal	Tempering	≥785	≥490	≥10	≥40	241~286

• 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		France	Russia
GB	ISC	JIS	ASTM/AISI	UNS	NF EN/NF	GOST
50Cr	A20502	SCr445	5150	G51500	50C4	50Х

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

1	GB /T 3077-1999
	50Cr A20502
2	GB /T 17107-1997
	50Cr
3	GB /T 3077-2015
	50Cr A20502
4	JB /T 6396-2006
	50Cr
5	GB /T 37601-2019
	50Cr

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