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