70Mn4

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#70Mn4

Description

70Mn4 Carbon Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Carbon Steel: 70Mn4

Category	Type	Steel Grade
Steel Grades	Carbon Steel	70Mn4
		4820H
		5120H
		8617H
		8620H
		9310H
		B40
		C56E
		B41
		56Mn4
		B42

Chemical composition(mass fraction)(wt.%) of the 70Mn4

C ≤	Si ≤	Mn ≤	P ≤	S ≤	Cr	Ni
0.65-0.75	0.4	0.8-1.1	0.025	0.015
Mo	Al	Cu	Nb	Ti	V	Ce
	0.05	0.3		+
N	O2	Pb	B	Other
	0.002

Mechanical Properties of steel grade 70Mn4

Yield R_p0.2 (MPa)	Tensile R_m (MPa)	Impact KV/Ku (J)	Elongation A (%)	Reduction in cross section on fracture Z (%)	As-Heat-Treated Condition	Brinell hardness (HBW)
493 (≥)	526 (≥)	32	11	34	Solution and Aging, Annealing, Ausaging, Q+T,etc	312

Physical Properties of steel grade 70Mn4

Temperature (°C)	Modulus of elasticity (GPa)	Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and	Thermal conductivity (W/m·°C)	Specific thermal capacity (J/kg·°C)	Specific electrical resistivity (Ω mm²/m)	Density (kg/dm³)	Poisson’s coefficient, ν
34	-	-			0.42	-
449	582	-	12.3	331		-
184	-	12	24.2			232	434

Heat Treatment of steel grade 70Mn4

Heat treated : 1814°C - 1949°C

Technological Curves of steel grade 70Mn4

No Curve

Available Suppliers

Jiangyou Longhai Special Steel Co.,Ltd.

Our main peoducts of steel are many kinds of special steel, like tool steel, mould steel, alloy steel, alloy constructural steel, heat-resistant steel, high speed tool steel,spring steel and bearing steel , stainless steel and so on, which have formed 12 series and more than 350 varieties with n...

Rfq.: sales@longhaisteel.com

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