Stainless steel
17-4 PH
Manufacturer or standards-body identification; product values do not apply to every form or condition.
Identity / state reference
What distinguishes this material
A martensitic precipitation-hardening grade: solution-treated Condition A and aged H900/H1150-type conditions are different purchase/use states.
- Designation in this reference
- 17-4 PH / UNS S17400
- Forms covered by the sources
- Cliffs sheet/strip, 0.015–0.125 in.
- States to distinguish or confirm
- Cliffs supplied Condition A; any subsequent H-condition must be stated.
- Temperature and exposure
- No universal service-temperature limit or room-temperature property set is assigned. Use the cited product document and the purchase certificate.
Other search names in these sources
UNS S17400
Read the scope above: a source’s related product name is not a blanket interchangeability statement.
Property evidence for a stated condition
No condition-specific numerical table is reproduced here
The linked sources establish the identity and the stated product/state scope. Obtain the row for your actual form, section, treatment and test conditions before adopting strength, hardness or a thermal limit.
Resolve these conditions next
- What product standard, edition and complete grade are on the material certificate?
- What product form, section size and delivery/heat-treatment condition will be machined?
For machining, take the exact grade, supplied condition and measured hardness where applicable into the tool maker’s application data. A generic material-family speed is not a substitute for an operation and tool-specific recommendation.
Sources and what they establish
Reviewed 23 October 2026. A source’s publication date and the review date are different. The scope below identifies the fields checked.
Cleveland-Cliffs 17-4-ph product data
Manufacturer flat-product datasheet; condition and dimensions are product-specific, not all bar, forging or casting supply.
Cleveland-Cliffs 17-4-ph product data ↗Source identity, a named product example and a supplied-batch certificate are different evidence. Cross-standard similarity does not approve substitution.
Corrections from the previous article
- Replace the generic 28–38 HRC statement with the actual aging condition; do not pair Condition A hardness with aged tensile strength.
- Withdraw the legacy generic hardness (28–38 HRC) and tensile-strength (1,310 MPa (190 ksi)) pair: the old page does not establish a matching product, heat treatment, section and test source.
- Remove the unsupported cutting-speed table and machinability percentage; select tooling only after the actual material condition is known.
Another precipitation-strengthened stainless reference
The A286 record has a different identity and treatment scope. Use its own sources when comparing temperature or strength requirements.