Stainless Steel 15-5 PH

Your guide to 15-5 PH Stainless Steel Machining



Optimal combination of high strength and corrosion resistance

A modification of 17-4 PH

Reasonable machinability

15-5 PH has the high strength from martensitic grades of stainless steel (gained through heat treatment) and the corrosion resistance of austenitic grades.

This guide will take you through the main attributes, common applications, notes for designers and suitable finishing and treatments, as well as UK stock sizes and property tables. Don't forget to bookmark the page so you can refer back later.

If you are interested in 15-5 PH stainless machined parts, please scroll to the bottom of the page for more information about our service and to request a quote.

15-5 PH Guide: Properties, Applications and Design Considerations


What is 15-5 PH Stainless Steel?

15-5 PH is a modification of 17-4 PH, a precipitation hardening stainless steel with the optimal combination of the properties of martensitic and austenitic grades. It has the high strength from martensitic grades (gained through heat treatment) and the corrosion resistance of austenitic grades.

Heat treated conditions:

  • Condition H900 (900°F)
  • Condition H925 (925°F)
  • Condition H1025 (1025°F)
  • Condition H1075 (1075°F)
  • Condition H1100 (1100°F)
  • Condition H1150 (1150°F)

15-5 PH has reasonable machinability. It can be machined in the solution-annealed state or in final heat treated condition.


Industry Examples: Aerospace | Nuclear | Oil & Gas | Renewable energy | Food processing | Petrochemical | Marine


Typical Components & Applications: Gears | Valves | Shafts | Fitting & fasteners | Pump parts | Structural components | Engine parts | Instrumentation

Main Attributes:
  • High strength after heat treatment
  • Good corrosion resistance
  • Good mechanical properties at temperatures up to 316°C
  • Excellent mechanical properties
  • Good welding characteristics
Can we meet your stainless steel 15-5 PH machining needs? Contact us now
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Further Reading & Resources

British Stainless Steel Association


15-5 PH Machining Stainless Steel Machined Parts


Penta Precision provides the following 15-5 PH machining services: 
  • CNC milling
  • CNC turning
  • Prototypes and batch runs
  • Insert installation
  • Part marking
  • Manual milling
  • Manual turning
  • Machining design advice
  • Design for manufacture service

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