40CrNi - GB /T 17107-1997

Grade	40CrNi
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
Classification	Alloy Steel

40CrNi Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.37	0.17	0.5	-	-	0.45	1	-
Maximum Value	0.44	0.37	0.8	0.035	0.035	0.75	1.4	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

40CrNi 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	Impact Energy Absorption KV2 J
d≤100	Sample Direction: Longitudinal	Tempering	≥735	≥590	≥14	≥45	223~277	≥47
100＜d≤300	Sample Direction: Longitudinal	Tempering	≥685	≥540	≥13	≥40	207~262	≥39
300＜d≤500	Sample Direction: Longitudinal	Tempering	≥635	≥440	≥13	≥35	197~235	≥39
500＜d≤800	Sample Direction: Longitudinal	Tempering	≥615	≥395	≥11	≥30	187~229	≥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.

1 Approximate Comparison Table structural alloy steel

China		United States		Germany		Russia	United Kingdom
GB	ISC	ASTM/AISI	UNS	DIN EN/DIN	W-Nr.	GOST	BS EN/BS
20CrNi 40CrNi 50CrNi	A40202 A40402 A40502	3140	G31400	40NiCr6	1.5711	20ХН 40ХН 50ХН	640M40

2 Approximate Comparison Table structural alloy steel

China	Japan	Russia
GB	JIS	GOST
40CrNi 40CrNiA 40CrNiE	SNC236	40XH 40XHA 40XHШ

40CrNi Corresponding Standards(Same grade name, different standards)

1	GB /T 3077-1999
	40CrNi A40402
2	GB /T 17107-1997
	40CrNi
3	GB /T 3077-2015
	40CrNi A40402
4	GJB 1220A-2008
	40CrNi
5	GB /T 3078-2019
	40CrNi

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