B7

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Description

B7 Carbon Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Carbon Steel: B7

Category	Type	Steel Grade
Steel Grades	Carbon Steel	B7
		B2
		100CrMnSi4-4
		B3
		100CrMnSi6-4
		B4
		100CrMnSi6-6
		B5
		100CrMo7
		B6
		100CrMo7-3

Chemical composition(mass fraction)(wt.%) of the B7

C ≤	Si ≤	Mn ≤	P ≤	S ≤	Cr	Ni
0.93-1.05	0.15-0.35	0.6-0.8	0.025	0.015	1.65-1.95
Mo	Al	Cu	Nb	Ti	V	Ce
0.4-0.5	≤ 0.05	≤0.3		+
N	O2	Pb	B	Other
	≤0.015

Mechanical Properties of steel grade B7

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)
161 (≥)	593 (≥)	23	23	34	Solution and Aging, Annealing, Ausaging, Q+T,etc	132

Physical Properties of steel grade B7

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
42	-	-			0.21	-
712	651	-	43.3	114		-
685	-	42	14.2			322	421

Heat Treatment of steel grade B7

Heat treated : 1132°C - 1574°C

Technological Curves of steel grade B7

No Curve

Cross Reference Table (Equivalent Grade) of B7

Grade	Standard	Country	Application
CB7Cu-1	AISI	USA
CB7Cu-2	AISI	USA
SNB7-2		China	China Taiwan Structural steel
CB7Cu-1	ASTM	USA	Steel Castings, Stainless, Precipitation Hardening
CB7Cu-2	ASTM	USA	Steel Castings, Stainless, Precipitation Hardening
CB7Cu-1	ASTM	USA	Steel Castings, Stainless, Precipitation Hardening
CB7Cu-2	ASTM	USA	Steel Castings, Stainless, Precipitation Hardening

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B7