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Precipitation Hardening SteelsPrecipitation Hardening Steels

Precipitation hardening stainless steels use nickel and chromium as their major alloying elements and are a combination of the martensitic and austenitic alloy types

In the solution annealed condition these steels have a semi-austenitic structure allowing for good machining and forming characteristics. However this is transformed after machining to a martensitic structure during heat treatment and strength is increased as a result. One of the advantages of precipitation hardening stainless steels is that full heat treatment can be achieved at relatively low temperatures minimising distortion.

Precipitation hardening stainless steels are used where high strength and good corrosion resistance are required as well as for applications requiring high fatigue strength, good resistance to galling and stress corrosion resistance. The reduced distortion during heat treatment makes these steels particularly suitable for intricate parts requiring machining and welding and where freedom from distortion is a requirement. Also known as stainless steel grade 630, 17-4PH is one of the most common steels in our product range – the 17-4 denotes 17% chromium and 4% nickel respectively. The material also includes 4% copper and 0.3% Niobium.


Precipitation hardening stainless steels are used in aerospace, defence and offshore oil & gas industries where a combination of high strength, corrosion resistance and a generally low but acceptable degree of toughness is required. Precipitation hardening stainless steels are also found in missile components, motor shafts, valve stems, gears and other mechanical components.


We stock a range of precipitation hardening stainless steels which are available for immediate supply ex-stock. Our range includes 13-8PH, 15-5PH, 15-7PH, 17-4PH, 17-7PH and A-286. Our processing operations allow us to cut your material to your specific size requirements too.

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To find out more about Smiths Metal Centres extensive range of precipitation hardening steels, click on one of our products on the side menu of this web page.

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