Grade 665 S66545 - ASTM A453/453M-2017

Grade	Grade 665
USA UNS	S66545
Corresponding Standard	ASTM A453/453M-2017 High-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless Steels
Classification	Alloy Steel

Grade 665 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	Ti	B	Al
Minimum Value	-	0.1	1.25	-	-	12	24	-	1.25	2.7	0.01	-
Maximum Value	0.08	0.8	2	0.04	0.03	15	28	0.25	2.25	3.3	0.07	0.25

Grade 665 Mechanical Properties

	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
Class A	Solution Heat Treatment + Hardening	≥1170	≥830	≥12	≥15	311~388
Class B	Solution Heat Treatment + Hardening	≥1070	≥830	≥12	≥15	311~388

New and Old Grade Replacement List

Grade665 Corresponding Standards(Same grade name, different standards)

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