Grade 660 - UNS S66286

 

High temperature bolting material, expansion coefficient comparable to Austenitic Stainless Steels.

 

Grade 660 Specification/Condition

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

Grade 660 applications

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

Grade 660 technical data

  • UTS (KSI): 145 Min
  • Yield 0.2% Offset (KSI): 105 Min
  • EL (% Min): 15
  • RA (% Min): 20
  • Hardness (HRC): 30-35
  • Charpy Impact Min. ft-lbs: 20 @-100°C

Grade 660 dimensions

  • 0.5 – 6.5 in

Grade 660 Chemical composition (Wt %)

 

Carbon
(C)
Manganes
(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)
Manganese
(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

 

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