31CrMo12 - ISO 683-5-2017

Grade	31CrMo12
Corresponding Standard	ISO 683-5-2017 Heat-Treatable Steels, Alloy Steels and Free-Cutting Steels-- Part 5: Nitriding Steels
Classification	Alloy Steel

31CrMo12 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo
Minimum Value	0.28	-	0.4	-	-	2.8	-	0.3
Maximum Value	0.35	0.4	0.7	0.025	0.035	3.3	0.3	0.5

31CrMo12 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	1030~1230	≥835	≥10	≥25
40≤d≤100, 20≤t≤60	Quenching and Tempering	980~1180	≥785	≥11	≥30
100≤d≤160, 60≤t≤100	Quenching and Tempering	930~1130	≥735	≥12	≥30
160≤d≤250, 100≤t≤160	Quenching and Tempering	880~1080	≥675	≥12	≥30

Approximate Comparison Table Nitriding Steels

International Organization for Standardization	Germany	France	European Standard		United Kingdom
ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	BS EN/BS
31CrMo12	31CrMo12	30CD12	31CrMo12	1.8515	722M24

31CrMo12 Corresponding Standards(Same grade name, different standards)

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