Grade 651 S63198 - ASTM A453/453M-2026

Grade	Grade 651
USA UNS	S63198
Corresponding Standard	ASTM A453/453M-2026 High-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless Steels
Classification	Alloy Steel

Grade 651 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	Ti	W	Cb ^①
Minimum Value	0.28	0.3	0.75	-	-	18	8	-	1	0.1	1	0.25
Maximum Value	0.35	0.8	1.5	0.04	0.03	21	11	0.5	1.75	0.35	1.75	0.6

Grade 651 Mechanical Properties

	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
Class A (d≤76mm)	Hardening Treatment	≥690	≥485	≥18	≥35	217~277
Class A (d＞76mm)	Hardening Treatment	≥690	≥415	≥18	≥35	217~277
Class B (d≤76mm)	Hardening Treatment	≥655	≥415	≥18	≥35	212~269
Class B (d＞76mm)	Hardening Treatment	≥655	≥345	≥18	≥35	212~269

Grade651 Corresponding Standards(Same grade name, different standards)

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