Custom 455®

UNS #S45500

Custom 455® is a martensitic age-hardenable stainless steel with a single-step aging treatment that develops exceptionally high yield strength, good ductility, good toughness, and a hardness capability of approximately HRC 50. This stainless can be machined in the annealed condition and welded in much the same manner as other precipitation hardenable stainless steels. Because of its low work-hardening rate, it can be extensively cold formed and has minimal dimensional change during hardening to permit close-tolerance finish machining in the annealed state. It should be considered where simplicity of heat treatment, ease of fabrication, high strength and corrosion resistance are required in combination.

Type Analysis

  • Carbon (Maximum) 0.05
  • Phosphorus (Maximum) 0.04
  • Silicon (Maximum) 0.5
  • Nickel (Nominal) 7.50-9.50
  • Titanium (Nominal) 0.80-1.40
  • Manganese (Maximum) 0.5
  • Sulfur (Maximum) 0.03
  • Chromium (Nominal) 11.00-12.50
  • Cobalt (Nominal) RPT
  • Molybdenum (Nominal) 0.5
  • Iron (Nominal) Balance
  • Copper (Nominal) 1.50-2.50
  • Columbium + Tantalum0.10-0.50


Aerospace: landing gear components, flap and slat track components, torque tubes, pneumatic cylinders, braces, struts, fuse pins, gimbals, and other structural elements Automotive: suspension coil springs, engine valve springs, torsion bars and instrumented wheel sensors- Medical: endoscopic instruments, scrapers, cutters, and suture needles Oil field: drive shafts, mud motors, and other downhole drilling tools Sporting goods: golf club faceplates, wire face shields for field sports, and big-bore firearms cylinders- High performance racing: speed boat propellers

Applicable Specifications

  • AMS 5617
  • ASME SA564
  • ASTM A693 (XM-16)
  • AMS 5860 (Strip)
  • ASTM A564 (XM-16)








Technical Information


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