Alloy 17-4 PH

Alloy 17-4 PH is a high strength stainless steel with good hardness and modest corrosion resistance properties, used widely in marine, food processing and petrochemical industries.

We offer 17-4 PH to 1150D; double aged to provide higher tensile strength properties, in sizes 19.05mm dia – 171 mm dia

  • ASTM A564 type 630
  • AMS 5604
  • UNS S17400
  • EURONORM 1.4542 X5CrNiCuNb 16-4
  • AFNOR Z5 CNU 17-4PH
  • DIN 1.4542

In addition to this specification all requirements of current edition of specification A484/A484M apply.

Fully certified material, additional testing available.

UK, US and European origin unless otherwise stated.

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Alloy 17-4 PH is a chromium-copper precipitation hardening martensitic stainless steel with Cu and Nb/Cb additions.

17-4PH Stainless Steel combines high strength, hardness (up to 572°F / 300°C), and moderate corrosion resistance. Alloy 17-4 PH withstands corrosive attacks better than any of the standard hardenable stainless steels and is comparable to Alloy 304 in most media. The alloy is subject to crevice or pitting attack if exposed to stagnant seawater for any length of time, although It is corrosion resistant in some chemical, petro- leum, paper, dairy and food processing industries (equivalent to 304L grade).

Mechanical properties can be improved (high strength and superior corrosion resistance) when precipitation hardened from Condition A to one of the Condition H tempers. We supply 17-4 PH in the H1150D condition. This is double aged at a temperature between 1140° F and 1160° F for 3.75 hours to 4.25 hours, with the second ageing being used to bring down the hardness value.

17-4 PH Chemical Composition

17-4 PH H115015.0 - 17.53.0 - - 5.00.15 - 0.45

17-4 PH Mechanical Data

ConditionUltimate Tensile Strength (PSI)0.2% Yield
Strength (PSI)
(% In 50mm.)
Reduction Of
Area (%)
Brinell HB
Hardness Rockwell
1650280 - 31129-33

For more technical information download our 17-4 PH information sheet here


Alloy 17-PH is used extensively in marine environments and in chemical, petrochemical, paper and food processing industries.

End product uses include:

  • manufacturing pump shafts
  • valve stems
  • hydraulic fittings
  • studs
  • fasteners
  • couplings
  • rollers
  • food handling equipment.

“We are not the biggest steel distributor around, but have differentiated ourselves by focusing on service, reliability and trying to find ways of helping customers rather than by just supplying metal – conversion, holding specific stock for quick delivery and consignment stock”

Mike Andrews


Proud Associates

Broder Metals Group Certified To AS9120
Broder Metals Group Certified To AS9120