Description
17- 4PH
Alloy 17-4PH (UNS S17400) is a martensitic stainless steel with chromium, nickel, and copper. Corrosion resistance is enhanced by the high strength and hardness of 17-4PH. As delivered, the alloy is in the solution annealed state (Condition A). In addition, it should not be used in cryogenic service or at temperatures greater than 572°F (300°C). Heat treatments that age the alloy can be used to achieve the best mechanical properties possible. The highest strength is achieved through heat treatment in the 900 °F (482 °C) range. When exposed to most environmental conditions, Alloy 17-4PH has corrosion resistance that is comparable to that of 304 stainless steel and is generally superior to that of the 400 series stainless steels.It is used as a reinforcement material in applications where a combination of moderate corrosion resistance and unusually high strength is required. It is simple to weld and process alloy 17-4PH according to standard shop fabrication procedures.
When exposed to most environmental conditions, Alloy 17-4PH has corrosion resistance that is comparable to that of 304 stainless steel and is generally superior to that of the 400 series stainless steels. It is used as a reinforcement material in applications where a combination of moderate corrosion resistance and unusually high strength is required. Some chemical, dairy, food, paper, and petroleum applications require corrosion resistance comparable to that of stainless steel 304L. As a general rule, alloy 17-4PH in the solution-annealed condition (Condition A) should not be used in any operational applications. As with the aged material, the alloy is prone to brittle fractures and is more susceptible to chloride stress corrosion cracking.
