Grade 660 S66286 - ASTM A453/453M-2026

Grade	Grade 660
USA UNS	S66286
Corresponding Standard	ASTM A453/453M-2026 High-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless Steels
Classification	Precipitation-Hardening Stainless Steel
Properties	Corrosion Resistance

Grade 660 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

Grade 660 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、B、C	Solution Heat Treatment + Hardening	≥895	≥585	≥15	≥18	248~341
Class D (d≤63.5mm)	Solution Heat Treatment + Hardening	≥895	≥725	≥15	≥18	248~321
Class D (d＞63.5mm)	Solution Heat Treatment + Hardening	≥825	≥655	≥15	≥18	248~321

1 Approximate Comparison Table Heat-Resistant Stainless Steel

2 Approximate Comparison Table Deformed High-Temperature Alloy

3 Approximate Comparison Table Stainless Steels for Cold Heading and Cold Extruding

China		Japan	United States		International Organization for Standardization		European Standard
GB	ISC	JIS	ASTM/AISI	UNS	ISO	Numerical Grade	EN	Numerical Grade
06Cr15Ni25Ti2MoAlVB (0Cr15Ni25Ti2MoAlVB)	S51525	SUH660	660	S66286	X6NiCrTiMoVB25-15-2	4980-662-86-X	X6NiCrTiMoVB25-15-2	1.4980

Grade660 Corresponding Standards(Same grade name, different standards)

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!