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Alloy 15-5

A precipitation hardenable Chromium-Nickel-Copper stainless, Alloy 15-5 offers an outstanding combination of high strength and excellent corrosion resistance.

15-5 Stainless Steel is a martensitic precipitation-hardening stainless steel that provides an outstanding combination of high strength, good corrosion resistance and good mechanical properties at temperatures up to 316°C.


Product formSize range fromSize range to
Alloy 15-5 round bar10 mm241.3 mm GET A QUOTE
Alloy 15-5 sheet & plate6.35 mm63.5 mm GET A QUOTE

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Sheet & Plate

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Round Bar

Chemical Analysis



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Perfect for applications in the Aerospace industry

Alloy 15-5 can be used in a variety of applications, here are just a few examples:

  • Aerospace applications
  • Oil and gas applications

About Alloy 15-5

Alloy 15-5 was designed to have high strength with superior toughness than 17-4 PH. Alloy 15-5 is martensitic in structure in the annealed condition (ferrite free) and it is further strengthened by a relatively low temperature heat treatment which precipitates a copper containing phase in the alloy. Alloy 15-5 is also referred to as XM-12 in some specifications.

To find out more about 15-5 stainless steel then contact us, or fill in our online quote form and we’ll get right back to you!


7.75 g/cm³
Poisson's ratio:
Electrical resistivity:


UNS Number:
ASTM A564, A693, A705
Download the Alloy 15-5 Data Sheet Download

FAQs & Resources

15-5 has high strength with greater toughness than 17-4. 15-5 alloy is martensitic in structure in the annealed condition and is further strengthened by a relatively low temperature heat treatment, which precipitates a copper containing phase in the alloy.

A type of stainless steel based on chromium and only small additions of other elements. Carbon levels can be high, allowing the quenching and tempering of the steel to very high strength.

The austenitic/higher Chromium, Nickel stainless steels, usually required in very high or very low temperatures, are generally more corrosion resistant than the lower Chromium ferritic or martensitic stainless. Martensitic stainless can be high- or low-Carbon steels built around the typical 400 stainless composition of Iron, 12% Chromium, and up to 1.2% Carbon.
Formation of martensite involves a transformation from a body-centered cubic structure to body-centered tetragonal structure. The large increase in volume that results creates a highly stressed structure. This is why martensitic stainless grades have a higher hardness and toughness than austenitic stainless grades.

This alloy finds extensive use in aircraft and missile construction, ranging from parts for instrumentation to landing gear components.
In addition, 15-5 can be used for valve parts, shafts, fittings, fasteners and gears.

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Fill in our online form to get a fast quote. Got a technical question? Contact us on techsales@neonickel.com or for more general enquiries please email us at enquiries@neonickel.com