Grade 660 (A-286)

Grade 660 (A-286)

Grade 660 (A-286). High temperature bolting material, expansion coefficient comparable to Austenitic Stainless Steels. vSM stocks A-286 Stainless Steel bar between 0.5 – 6.5 in.

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Grade 660 Specification/Condition

• ASTM A453 Gr 660 B+D/ ASTM A638 Gr 660 Type 2/ NACE MR0175 / UNS S66286

Grade 660 Applications

• bolting for piping and special purpose applications
• boiler and pressure vessels

Grade 660 Technical Data

• UTS (KSI): Min 120 KSI
• Yield 0.2% Offset (KSI): Min 95 KSI
• EL (% Min): 15%
• RA (% Min): 35%
• Hardness (HRC): 24-35 HRC
• Charpy Impact Min. ft-lbs: 20 @-100°C

Grade 660 Stocking Dimensions

• Bar: 0.5 – 6.5 in
• Bored Bar with bespoke internal diameters via vSM’s in-house deep hole drilling and honing capabilities

 

Grade 660 Chemical Composition (Wt %)

 

Carbon (C)	Manganese (Mn)	Phosphorus (P)	Sulfur (S)	Silicon (Si)	Nickel (Ni)	Cobalt (Co)
0.08 Max	2.0 Max	0.040 Max	0.030 Max	1.0 Max	24.0-27.0	–

 

Chromium (Cr)	Molybdenum (Mo)	Niobium + Tantalum (Nb (Cb) + Ta)	Titanium (Ti)	Copper (Cu)	Aluminum (Al)	Iron (Fe) & Others
13.5-16.0	1.0-1.5	–	1.9-2.35	–	0.35	Fe– Balance, V– 0.10-0.50, B– 0.001-0.010