Cast iron
Ni-Hard 4
Manufacturer or standards-body identification; product values do not apply to every form or condition.
Identity / state reference
What distinguishes this material
The Nickel Institute table places Ni-Hard 4 in Class I Type D. Its EN-JN2049 comparison has a separate chemistry row and is not automatic equivalence.
- Designation in this reference
- Ni-Hard 4 / ASTM A532 Class I Type D
- Forms covered by the sources
- Abrasion-resistant white-iron castings.
- States to distinguish or confirm
- Specify supplied heat-treatment condition, section and carbide/matrix requirements.
- 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.
Nickel Institute, Nickel magazine Spring 2021
Page 12 table identifies Ni-Hard 4 as ASTM A532 Class I Type D; nearby EN grade has its own chemistry.
Nickel Institute, Nickel magazine Spring 2021 ↗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
- Correct the old ASTM A532 Class II Type D identification to Class I Type D; remove universal tensile/hardness values independent of treatment.
- Withdraw the legacy generic hardness (450–550 HB) and tensile-strength (550 MPa (80 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 Cast iron
Related references, not equivalent substitutes.