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Precipitation-hardening stainless steel

  • Overview

    Precipitation hardening stainless steel refers to stainless steel with matrix of austenitic or martensitic structure, and can be strengthened by aging hardening treatment. After proper heat treatment, it can undergo martensitic transformation and precipitate intermetallic compounds on the martensitic matrix, thus precipitating and strengthening. This type of steel is of high or ultra-high strength.

  • Properties

    1, Excellent room temperature strength

    2, Has good overall corrosion resistance, oxidation resistance, vulcanization resistance, fatigue resistance

    3, Strong, toughness with good, low temperature toughness

    4, Easy cold and hot processing performance

    5, Good welding performance

  • Classification

    According to the structure of steel, it can be divided into three categories:

    (1) Martensitic precipitation hardening stainless steel

    (2) Semi-austenitic precipitation hardening stainless steel

    (3) Austenitic precipitation hardening stainless steel

  • Typical grades

    (1) Martensite type

    17-4PH (630, UNS S17400)

    (2) Austenite-martensite type

    17-7PH (631, UNS S17700)

    PH15-7Mo (632, UNS S15700)

    AM355 (634, UNS S35500)

    (3) Austenite type



  • Application

    These steels are generally used for parts requiring corrosion resistance and high strength at room temperature, or at temperatures up to 600°F [315°C].

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