About Smiths

We are a world-class supplier of engineering raw materials. Our objective is to provide all our customers, from the small machine shop to the large multi-national corporation, a supply path that continuously delivers the highest levels of service, quality and value.

15 5PH (AMS 5659, UNS S15500)

Precipitation Hardening Stainless Steel

15 5PH Precipitation Hardening Stainless Steel

15/5 PH VAR is a martensitic, precipitation hardening stainless steel containing 4% copper.


It possesses all the advantages of 17/4 PH, including single low-temperature thermal treatment. It also offers excellent transverse notch toughness and ductility and very good uniformity of properties. The mechanical properties in larger sections and forgeability are superior to that of 17/4 PH. 15/5 PH VAR is produced by the consumable electrode, vacuum arc re-melted route which enhances ductility and toughness and gives an essentially ferrite-free microstructure. This alloy has a typical density of 7.8 kg/dmĀ³ and magnetic permeability of 95.

Typical Applications

Commercial applications for this engineering material include:

  • Intricate machined parts
  • Aircraft construction
  • Missile systems
  • Instrumentation
  • Valves, shafts and gears
  • Chemical process equipment
  • Nuclear reactor components

We stock 15 5PH in flats, round bar, plate, sheet, hollow bar and square bar.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.

Additional Info

A technical datasheet for 15 5PH is available in PDF file format. To view and download, please click here.

We offer in-house processing options - for more information, please refer to our processing services.

Read our corporate brochure by clicking here.

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