A193 B7 CrMo - ASTM A193/A193M-2020

Grade	A193 B7
Other Names
Corresponding Standard	ASTM A193/A193M-2020 Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications
Classification	Alloy Steel
Properties	High-Temperature Strength

A193 B7 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo
Minimum Value	0.38	0.15	0.75	-	-	0.8	0.15
Maximum Value	0.48	0.35	1	0.035	0.04	1.1	0.25

• The intentional addition of Bi, Se, Te, and Pb is not permitted

A193 B7 Mechanical Properties

diameter d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
d≤M64	Tempering Temperature ≥593°C	≥860	≥720	≥16	≥50	≤321
M64＜d≤M100	Tempering Temperature ≥593°C	≥795	≥655	≥16	≥50	≤321
M100＜d≤M180	Tempering Temperature ≥593°C	≥690	≥515	≥18	≥50	≤321

• d-diameter of bolt, screw, studs, double-end studs, bars and wire.

1 Approximate Comparison Table Structural Alloy Steel

2 Approximate Comparison Table Structural Alloy Steel

A193B7 Corresponding Standards(Same grade name, different standards)

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