70Mn U21702 - GB /T 1222-2025

70Mn Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.67	0.17	0.9	-	-	-	-	-
Maximum Value	0.75	0.37	1.2	0.025	0.02	0.25	0.35	0.2

70Mn Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %
Normalizing at 790±30°C	≥785	ReL ≥450	≥8	≥30

1 Approximate Comparison Table High-Quality Carbon Structural Steel

China		United States	International Organization for Standardization
GB	ISC	ASTM/AISI	ISO
70Mn (GB/T 699-2015)	U21702	1572 (ASTM A29/A29M:2005)	DC (ISO 8458-3:1992)

2 Approximate Comparison Table High-Quality Carbon Structural Steel

China		Japan	United States	International Organization for Standardization	Russia	United Kingdom
GB	ISC	JIS	ASTM/AISI	ISO	GOST	BS EN/BS
70Mn	U21702	SWRH72B	1572	DM, DH Type SC	70Г	080A72

70Mn 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"!