EN ISO 4957 — Tool steels
Scope
Non-alloy and alloy cold-work, hot-work and high-speed tool steels supplied as bar, rod, wire, forgings, plate and strip: C45U–C120U, 1.2842 (90MnCrV8), 1.2379 (X153CrMoV12), 1.2363 (X100CrMoV5), 1.2344 (X40CrMoV5-1), 1.2343, 1.2767, HS6-5-2 and others. Specifies chemistry, annealed hardness, hardening temperatures and hardness after hardening as reference values.
Grades covered by EN ISO 4957
| Grade | No. | Type | C % | Yield MPa | Tensile MPa | Nearest equivalents |
|---|---|---|---|---|---|---|
| 1.2379 | 1.2379 | Cold-work tool steel, 12 % Cr ledeburitic | 1.45 – 1.6 | — | ≈ 750–850 (typ.) | D2, SKD11, Cr12Mo1V1 |
Revision history and superseded standards
| Year | Change |
|---|---|
| 1999 | EN ISO 4957:1999 — replaced DIN 17350 and national tool-steel standards |
| 2018 | EN ISO 4957:2018 — current; grade list and reference heat-treatment data updated |
Supersedes: DIN 17350:1980; EN ISO 4957:1999.
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Related standards
ASTM A681JIS G4404