31CrMoV9 - ISO 683-5-2017

Grade	31CrMoV9
Corresponding Standard	ISO 683-5-2017 Heat-Treatable Steels, Alloy Steels and Free-Cutting Steels-- Part 5: Nitriding Steels
Classification	Alloy Steel

31CrMoV9 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo	V
Minimum Value	0.27	-	0.4	-	-	2.3	0.15	0.1
Maximum Value	0.34	0.4	0.7	0.025	0.035	2.7	0.25	0.2

31CrMoV9 Mechanical Properties

	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
16≤d≤40, 8≤t≤20	Quenching and Tempering	1100~1300	≥900	≥9	≥25
40≤d≤100, 20≤t≤60	Quenching and Tempering	1000~1200	≥800	≥10	≥30
100≤d≤160, 60≤t≤100	Quenching and Tempering	900~1100	≥700	≥11	≥35
160≤d≤250, 100≤t≤160	Quenching and Tempering	850~1050	≥650	≥12	≥40

1 Approximate Comparison Table Nitriding Steels

International Organization for Standardization	European Standard
ISO	EN	Numerical Grade
31CrMoV9	31CrMoV9	1.8519

2 Approximate Comparison Table Structural Alloy Steel

China	International Organization for Standardization
GB	ISO
31Cr3MoV	31CrMoV9

31CrMoV9 Corresponding Standards(Same grade name, different standards)

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