Temper Tough®

UNS #K63835

Temper Tough® is an air melted, cobalt-free, high-strength, high-toughness quenched and tempered alloy. It attains a typical 290 ksi (1999 MPa) UTS combined with a typical range of 60-65 ksi sqrt(in.) (66-71 MP sqrt(m)) fracture toughness. Temper Tough® is not a stainless alloy and may require plating or coating with a rust preventative or oil to prevent corrosion. The KIscc (as measured in a Rising Step Load Test) of Temper Tough alloy is 11.0 ksi sqrt(in.) (12.1 MPa sqrt(m)) in a 3.5% NaCl solution.

Type Analysis

  • Carbon (Nominal) 0.4
  • Silicon (Nominal) 1.5
  • Nickel (Nominal) 3.8
  • Manganese (Nominal) 0.85
  • Chromium (Nominal) 1.25
  • Molybdenum (Nominal) 0.5
  • Iron (Nominal) Balance
  • Copper (Nominal) 0.5
  • Vanadium (Nominal) 0.3


fasteners, landing gear, actuators, ordnance, shafts, structural components, Structural tubing, bearing components

Applicable Specifications



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