Project Description

15-7 PH (UNS S15700 / W.Nr. 1.4532)

15-7 PH (UNS S15700 / W.Nr. 1.4532) is martensitic precipitation hardening stainless steel, also known as controlled phase change stainless steel. After solution treatment, it is an unstable austenite structure with good plastic toughness and workability. After adjustment, the austenite precipitated carbide composition changes, and after martensite transformation treatment, most of the structure is transformed into toughness Good low carbon tempered martensite, this state is the state of use of steel, and has good mechanical properties at medium temperature. Corrosion resistance is better than general martensitic stainless steel.

Equivalent Grades

15-7 PH0Cr15Ni7Mo2Al632S15700X8CrNiMoAl15-7-21.4532

Chemical Composition, %

15-7 PH≤0.1≤0.7≤1.2≤0.04≤0.01514.0-16.06.5-7.82.0-3.00.7-1.5Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM A564, 705, SAE AMS 5669
Plate, Sheet and StripASTM A693, SAE AMS 5862
Pipe and Tube
Welding Product


  • Minimum distortion on heat treatment Good corrosion resistance
  • High strength
  • Easy formed once annealed


15-7 PH precipitation hardened steel can be used at high temperature of 500 °C. It is both austenitic stainless steel and austenitic heat-strength steel, which is widely used, but the working temperature should not exceed 540 °C. Usually 15-7 PH precipitation hardening steel is similar to 17-7 PH, which can be used in the form of steel belts, and also used as springs, hot coils, gauge accessories, medical tools, oil drilling and other mechanical accessories.