Stainless Steel, Precipitation HardeningAMS 5629 (13-8)

A precipitation hardenable chromium-nickel-molybdenum martensitic stainless grade.

Precipitation hardening steels are characterised into one of three groups based on their final microstructures after heat treatment. The three types are: martensitic, semi-austenitic and austenitic.

Martensitic precipitation hardening stainless steels have a predominantly austenitic structure at annealing temperatures of around 1040 to 1065°C. Upon cooling to room temperature, they undergo a transformation that changes the austenite to martensite.

AMS5629 (13-8) is a martensitic precipitation hardening stainless steel. Heat treatment provides 13-8 with high strength. It comes in various conditions offering an array of properties. Good transverse toughness properties are achieved by tight chemical composition control, low carbon content, and vacuum melting.

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Related Specifications

  • AISI 632
  • AMS 5629
  • AMS 5864
  • ASTM A564 (XM-13)
  • ASTM A693 (XM-13)
  • ASTM A705 (XM-13)
  • DIN 1.4534
  • UNS S13800


Chemical Composition


  • Landing gear and aircraft structural parts
  • Valves
  • Shafts
  • Components in the petrochemical and nuclear industries
  • Motorsport components
  • Injection moulding equipment
  • Fittings and fasteners


  • Excellent strength
  • High hardness
  • Superior toughness
  • Excellent weldability
  • Good corrosion resistance
  • Excellent machinability

Additional Information

Mechanical Properties

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