Stainless steel
AISI 440C
Manufacturer or standards-body identification; product values do not apply to every form or condition.
Identity / state reference
What distinguishes this material
N695 is the cited 440C product; the grade requires a specific hardening and tempering state before its wear/hardness performance can be used.
- Designation in this reference
- 440C / UNS S44004
- Forms covered by the sources
- N695 bars, wire, forgings and forging stock.
- States to distinguish or confirm
- Delivery and final hardened state must be distinguished.
- 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 S44004
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.
BÖHLER N695
440C / S44004 long-product identity and product shapes; heat-treatment-dependent hardness.
BÖHLER N695 ↗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
- Remove the page-wide annealed tensile value paired with a hardened HRC range.
- Withdraw the legacy generic hardness (56–60 HRC hardened) and tensile-strength (1,970 MPa (285 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.
Other references in Stainless steel
Related references, not equivalent substitutes.