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.

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 Max2.0 Max0.040 Max0.030 Max1.0 Max24.0-27.0–
Chromium(Cr)Molybdenum(Mo)Niobium + Tantalum(Nb (Cb) + Ta)Titanium(Ti)Copper(Cu)Aluminum(Al)Iron (Fe) & Others
13.5-16.01.0-1.5–1.9-2.35–0.35Fe– Balance, V– 0.10-0.50,
B– 0.001-0.010
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