A193 B8ML4CuN Class 1 S31730 - ASTM A193/A193M-2020

Grade	A193 B8ML4CuN Class 1
USA UNS	S31730
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	Austenitic Stainless Steel
Properties	Corrosion Resistance Forgability Weldability

A193 B8ML4CuN Class 1 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N
Minimum Value	-	-	-	-	-	17	15	4	3	-
Maximum Value	0.03	1	2	0.04	0.01	19	16.5	5	4	0.045

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

A193 B8ML4CuN Class 1 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
All Sizes	Carbide Solid Solution Treatment	≥480	≥175	≥35	≥50	HRB ≤90

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

A193B8ML4CuNClass1 Corresponding Standards(Same grade name, different standards)

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