SA453 Grade 660 Class B - ASME SA-453/SA-453M - H2ABC

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Grade	SA453 Grade 660 Class B
Corresponding Standard	ASME SA-453/SA-453M Specification for Bolting Materials, High- Temperature, 50 To120 Ksi [345 To 827 Mpa] Yield Strength with Expansion Coefficients Comparable to Austenitic Steel
Classification	Precipitation-Hardening Stainless Steel

SA453 Grade 660 Class B Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	Ti	V	B	Al
Minimum Value	-	-	-	-	-	13.5	24	1	1.9	0.1	0.001	-
Maximum Value	0.08	1	2	0.04	0.03	16	27	1.5	2.35	0.5	0.01	0.35

SA453 Grade 660 Class B Mechanical Properties

diameter d mm	Test Temperature	Mark	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
All specifications	Room Temperature	Gr 660 Class B	≥895	≥585	≥15	≥18	HBW: 248~341； HRB: ≥99①； HRC: ≤37
All specifications			≥100h, Endurance Strength: ≥385		≥5

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