Materials

Stainless Steel A286 (UNS S66286, ASTM A453 Grade 660A, 660B, 660D)

• Material: A precipitation-hardened iron-nickel-chromium alloy stainless steel containing additions of titanium, molybdenum, and vanadium. Commonly supplied for high-strength fasteners under ASTM A453 Grade 660 conditions, providing excellent elevated-temperature mechanical properties and corrosion resistance.

• Mechanical Properties:

  • High strength: yield strengths typically range from approximately 85–150 ksi depending on the ASTM A453 Grade 660 condition (A, B, or D) and heat treatment.

  • Excellent creep rupture strength and stress relaxation resistance at temperatures up to approximately 1300°F (700°C).

  • Good fatigue resistance, toughness, and ductility compared to many other high-temperature alloys.

• Corrosion Resistance:

  • Excellent resistance to oxidation and scaling at elevated temperatures.

  • Good resistance to atmospheric corrosion, fresh water, and many industrial environments.

  • Maintains corrosion resistance and mechanical integrity under prolonged high-temperature service conditions.

  • Better resistance to stress corrosion cracking than many conventional high-strength alloy steels.

• Manufacturing Considerations:

  • Readily machined in the solution-annealed condition but exhibits work hardening during machining.

  • Requires solution annealing and precipitation hardening (aging) to achieve specified ASTM A453 Grade 660 mechanical properties.

  • Can be welded using established procedures, although post-weld heat treatment may be required to restore optimum properties.

  • Suitable for hot and cold forming operations used in the manufacture of engineered fasteners and precision components.

• Applications in Fasteners & Components:

  • High-temperature bolts, studs, nuts, and threaded fasteners manufactured to ASTM A453 Grade 660 requirements.

  • Gas turbines, steam turbines, and power generation equipment.

  • Aerospace engines, exhaust systems, and structural fastening applications.

  • Oil & gas equipment requiring high strength and elevated-temperature performance.

  • Industrial furnaces, petrochemical processing equipment, and other critical high-temperature applications.