Grade 660 (A-286)

UNS S66286 : ASTM A638 (VO1.03), A453 (VO1.01)
Trade Name A-286

General scope

Grade 660 is a precipitation hardening austenitic stainless steel widely used for high temperature fastening and bolting materials. Its relatively high nickel content for a stainless steel means that is sometimes categorized as a nickel alloy. The grade is commonly used for operating temperatures up to 7007°C (13007°F).

Chemical composition

 

 
 CSiMnPSCrNiMoTiAlVBFe
Min 13.50 24.00 1.00 1.90 0.10 0.00
Max 0.08 1.00 2.00 0.040 0.030 16.00 27.00 1.50 2.35 0.35 0.50 0.01 0.00

Mechanical properties

Condition: Solution Annealed and Water Quenched.

NACE MR0175 limits the supply hardness to 35 HRC max.
U.T.S 130 KSI Min (895 N/mm2)
0.2% Proof Stress 85 KSI Min (585 N/mm2)
Elongation 15 %  
Red of Area 18 %  
CVN Impacts @ -60°C (-75°F) 57 Joules (42 ft-lbf)
Size range: 2”∅ - 12”∅

Primarily manufactured in:

  • Dubai, UAE
  • Edmonton, Canada
  • Houston, Texas
  • Sheffield, England
  • Singapore