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Alloy 17-4

A precipitation hardenable chromium-nickel-copper grade, Alloy 17-4 offers excellent corrosion resistance, high creep rupture strength and high tensile strength.

Most commonly used in the oil and gas, aerospace and motorsport markets, Alloy 17-4 offers excellent corrosion resistance, high creep rupture strength, high tensile strength and hardness.


Product form Size range from Size range to
Alloy 17-4 round bar 6.35 mm 304.8 mm
Alloy 17-4 sheet & plate 3.048 mm 76.2 mm

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    Sheet & Plate

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    Round Bar

Chemical Analysis

% Ni Cr Mo Mn Cu Si C Cb+Ta S P Fe
Min 3 15 - - 3 - - 5 x c - - -
Max 5 17.5 0.05 1 4 1 0.07 0.45 0.03 0.04 Balance


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Ideal for the motorsport industry

Alloy 17-4 can be used in a variety of applications including:

  • Gate valves
  • Pump shafts, gears and plungers
  • Valve stems, balls, bushings and seats
  • Fasteners

About Alloy 17-4

Alloy 17-4 is an age-hardening martensitic stainless combining high strength with the corrosion resistance of stainless steel.

The alloy maintains high tensile strength and hardness up to 316°C and excellent oxidation resistance up to 593°C. Alloy 17-4 has good creep-stress rupture properties up to 482°C.

Hardening is achieved by a short-time, simple low-temperature treatments. Unlike conventional martensitic stainless steels, such as type 410, Alloy 17-4 is more weldable.

The strength, corrosion resistance and simplified fabrication can make Alloy 17-4 stainless a cost-effective replacement for high strength carbon steels as well as other stainless grades.

For more information on 17-4 Stainless, or to enquire about our inventory then please contact us, alternatively fill in our online quote form and we’ll get right back to you.



7.81 g/cm³
Poisson's ratio :
Melting range:
1404.4 – 1440.6 °C
Electrical resistivity:
7.7 x 10^-7 Ωm


UNS Number:
Werkstoff Number:
1.4542, 1.4548
ASTM A693, A564, A705, AMS 5604, 5622, 5643, 5825
Download the Alloy 17-4 Data Sheet Download

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