Tool steel
H11 Tool Steel
Manufacturer or standards-body identification; product values do not apply to every form or condition.
Identity / state reference
What distinguishes this material
W300 ISOBLOC is an ESR H11 product. The supplier chemistry differs from H13 in more than a simple “lower carbon” label.
- Designation in this reference
- H11
- Forms covered by the sources
- W300 ISOBLOC long-product programme.
- States to distinguish or confirm
- ESR identifies melting route; delivery anneal and final hot-work treatment remain 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.
BÖHLER W300 ISOBLOC
H11 / 1.2343 ESR product; supplier-specific cleanliness route.
BÖHLER W300 ISOBLOC ↗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 oversimplified lower-carbon-than-H13 explanation and do not assign ESR properties to all H11.
- Withdraw the legacy generic hardness (192–229 HB (annealed)) and tensile-strength (1,550 MPa (225 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.
Other references in Tool steel
Related references, not equivalent substitutes.