UNS #S13800

13Cr-8Ni is a martensitic precipitation/age-hardening stainless steel capable of high strength and hardness along with good levels of resistance to both general corrosion and stress-corrosion cracking. In addition, the alloy exhibits good ductility and toughness in large sections in both the longitudinal and transverse directions. The excellent properties of 13-8 stainless are obtained through close control of chemical composition and microstructure plus specialized melting which reduces impurities and minimizes segregation. Compared to other ferrous-base materials, this alloy offers a high level of useful mechanical properties under severe environmental conditions, has good fabrication characteristics, and can be age-hardened by a single low temperature treatment. Cold work prior to aging increases the aging, especially for lower aging temperatures.

Type Analysis

  • Carbon (Maximum) 0.05
  • Phosphorus (Maximum) 0.01
  • Silicon (Maximum) 0.1
  • Nickel (Nominal) 7.50-8.50
  • Manganese (Maximum) 0.1
  • Sulfur (Maximum) 0.008
  • Chromium (Nominal) 12.25-13.25
  • Molybdenum (Nominal) 2.00-2.50
  • Iron (Nominal) Balance
  • Aluminum (Nominal) 0.90-1.35
  • Nitrogen (Nominal) 0.01


valve parts, fittings, cold-headed and machined fasteners, shafts, landing gear parts, pins, lockwashers, aircraft components, nuclear reactor components and petrochemical applications requiring resistance to stress-corrosion cracking

Applicable Specifications

  • AMS 5629
  • ASTM A564 (Grade XM-13)
  • ASTM A705 (Grade XM-13)
  • ASME SA705
  • ASTM A693 (Grade XM-13)
  • MIL-S-2154



Hollow Bar






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