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17-4 stainless is an age-hardening martensitic stainless combining high strength with the corrosion resistance of stainless steel. Hardening is achieved by a short-time, simple low-temperature treatment. Unlike conventional martensitic stainless steels, such as type 410, 17-4 is quite weldable. The strength, corrosion resistance and simplified fabrication can make 17-4 stainless a cost-effective replacement for high strength carbon steels as well as other stainless grades. 

At the solution treating temperature, 1900°F, the metal is austenitic but undergoes transformation to a low-carbon martensitic structure during cooling to room temperature. This transformation is not complete until the temperature drops to 90°F. Subsequent heating to temperatures of 900-1150°F for one to four hours precipitation strengthens the alloy. This hardening treatment also tempers the martensitic structure, increasing ductility and toughness. 


  • Gate valves

  • Chemical processing equipment

  • Pump shafts, gears, plungers

  • Valve stems, balls, bushings, seats

  • Fasteners

Property Analysis:

Carbon 0.07

Manganese 1

Silicon 1

Chromium 165-17.5

Nickel 3-5

Copper 3-5

Phosphorus 0.04

Sulfur 0.3


  • High tensile strength and hardness to 600°F

  • Corrosion resistant

  • Excellent oxidation resistance to about 1100°F

  • Creep-rupture strength to 900°F

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