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 15-5PH, UNS S51500, W.Nr. 1.4545


15-5PH is a martensitic precipitation-hardening stainless steel that provides high strength, good corrosion resistance, good mechanical properties at temperatures up to 600°F (316°C) and good toughness in both the longitudinal and transverse directions in both base metal and welds. 15-5 PH stainless steel is the ferrite-free version of 17-4PH stainless steel. Both materials widely used in the aerospace, chemical, petrochemical, food processing, paper and general metalworking industries.

  • Aerospace Industry: Aircraft structural parts, landing gear, fittings, and engine parts
  • Chemical Processing: Pumps, valves, fittings, and heat exchangers that come into contact with corrosive chemicals
  • Nuclear Industry: Reactor components, control rod mechanisms, and storage containers
  • Marine Applications: Propeller shafts, pump shafts, fasteners, and other marine hardware
  • Oil and Gas Industry: Downhole tools, valves, and fittings
  • Medical and Pharmaceutical Equipment: Surgical instruments, orthopedic implants, and pharmaceutical processing equipment
  • Firearms and Defense: Barrels, receivers, and action parts
Chemical Composition (%)
Material C Mn P S Si Cr Ni Cu
15-5PH 0.07 max 1.00 max 0.04 max 0.03 max 1.00 max 14.0-15.5 3.50-5.50 2.50-4.50
Mechanical Property
Material Tensile strength Yield strength 0,2 Elongation Hardness HB30
15-5PH 930-1310 N/mm² 700-1170 N/mm² 10-16% 277-444HB
Corrosion Resistance

In both strongly oxidizing and reducing media, as well as by atmospheric exposures, The corrosion resistance of 15-5PH stainless steel exceeds types 410 and 431, and is approximately equal to 17-4PH. The general corrosion resistance of this material is best in the fully hardened condition, and decreases slightly as the aging temperature is increased. Also, 15-5PH can get good resistance to stress-corrosion cracking is gained by hardening at temperatures of 1025ºF (551ºC) and higher.

Heat Treatment

15-5PH stainless steel is normally supplied in the solution-treated condition (Condition A). It can be hardened by heating solution-treated material to a temperature of 900ºF (482ºC) to 1150ºF (621ºC) for one to four hours, depending on the temperature, then air cooling or oil quenched. Sections under 3" (76 mm) can be oil quenched and sections over 3" (76 mm) should be rapidly air cooled. Do not use in this condition without age hardening due to low toughness, poor impact strength and susceptibility to stress-corrosion cracking.

Heating and Pickling

Heating of 15-5PH is commonly performed for heat treatment purposes. The process involves heating the material to specific temperatures and holding it for a certain duration in controlled atmospheres, and air cooling or quenching, to prevent oxidation and achieve desired mechanical propertie, improve strength and hardness. Post-treatment processes may be necessary to meet the final product specifications. 


Pickling is a common process used to remove surface impurities and oxide layers from 15-5PH. It involves immersing the material in a pickling solution, typically an acid-based solution, to dissolve contaminants and restore the material's corrosion resistance.

Hot and Cold Forming

15-5PH stainless steel can be formed through both hot forming and cold forming processes, each offering distinct advantage.


Hot forming of 15-5PH stainless steel takes advantage of the material's increased ductility and reduced resistance to plastic deformation when heated, enable the material to be easily shaped into complex forms with reduced risk of cracking in high temperatures. Hot forming methods such as hot rolling, forging, and hot extrusion are commonly employed, particularly suitable for larger and more intricate components that require extensive deformation.


Cold forming of 15-5PH stainless steel takes advantage of the alloy's inherent ductility and allows for precise shaping, tight tolerances, and improved surface finish. Cold forming methods include cold rolling, cold drawing, bending, and deep drawing, its often preferred for smaller, simpler components or those that require high dimensional accuracy and surface quality. Also, It improves the strength and hardness of this material due to work hardening during the process.


15-5PH stainless steel is readily machined in both the solution-treated and various age-hardened conditions. In the solution-treated condition, it machines similarly to stainless Types 302 and 304. In age-hardened conditions, the machinability will improve as the hardening temperature is increased.


15-5PH stainless steel is weldable by the common shielded fusion and resistance welding processes, it has equivalent weldability of 17-4PH. When a filler metal is required, AWS E/ER630 welding consumables should be considered to provide welds with properties matching those of the base metal. Oxyacetylene welding is not recommended, since carbon pickup in the weld may occur. Normally, welding in the solution-treated condition, the material can be directly aged to the desired strength level after welding.

Product Forms
  • Bar & Rod
  • Plate & Sheet
  • Coil & Strip
  • Pipe & Tube
  • Fitting: Flange, Tee, Elbow, Reducer etc.
  • Forging: Ring, Shaft, Circle, Block etc.

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