20CrMnMo - GB /T 17107-1997

Grade	20CrMnMo
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
Classification	Alloy Steel

20CrMnMo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.17	0.17	0.9	-	-	1.1	-	-	0.2
Maximum Value	0.23	0.37	1.2	0.035	0.035	1.4	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

20CrMnMo 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 %	Impact Energy Absorption KV2 J
d≤30	Sample Direction: Longitudinal	Carburizing + quenching + tempering	≥1080	≥785	≥7	≥40	-
30＜d≤100	Sample Direction: Longitudinal	Carburizing + quenching + tempering	≥835	≥490	≥15	≥40	≥31

• 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	South Korea	United States	Russia
GB	ISC	JIS	KS	ASTM/AISI	GOST
20CrMnMo	A34202	SCM421	SCM421	4119	18ХГМ

20CrMnMo Corresponding Standards(Same grade name, different standards)

1	GB /T 3077-1999
	20CrMnMo A34202
2	GB /T 17107-1997
	20CrMnMo
3	GB /T 3077-2015
	20CrMnMo A34202
4	GB /T 3078-2019
	20CrMnMo
5	Q/BQB 560-2009
	20CrMnMo
6	JB /T 6396-2006
	20CrMnMo

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