Tool steel
S7 Tool Steel
Manufacturer or standards-body identification; product values do not apply to every form or condition.
Identity / state reference
What distinguishes this material
The ExELL S7 product is chromium-molybdenum tooling steel with a specified spheroidizing-anneal route; final hardening still depends on section and treatment.
- Designation in this reference
- S7
- Forms covered by the sources
- Ellwood forged tool-steel stock.
- States to distinguish or confirm
- Full spheroidizing anneal is part of the cited supplier route; final hardening/tempering separate.
- Temperature and exposure
- No universal service-temperature limit or room-temperature property set is assigned. Use the cited product document and the purchase certificate.
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.
Walter Metals S7
Producer ExELL S7 chromium-molybdenum product, spheroidizing anneal and separate hardening guidance.
Walter Metals S7 ↗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
- Do not equate the annealed stock condition with 54–58 HRC finished tooling; keep supplier route and base grade distinct.
- Withdraw the legacy generic hardness (185–215 HB (annealed)) and tensile-strength (1,590 MPa (230 ksi) hardened) 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.
Compare another shock-resisting grade
Read the S5 grade and treatment scope separately before comparing toughness or hardness examples.