Chemical composition
Cast analysis, mass fraction %. Unspecified values are not zero.
| Element | Mass fraction / % |
|---|---|
| C | 0.95～1.03 |
| Si | ≤0.45 |
| Cr | 3.8～4.5 |
| V | 2.2～2.5 |
| Mn | ≤0.4 |
| P | ≤0.03 |
| S | ≤0.03 |
| Mo | 2.5～2.9 |
| W | 2.7～3 |
Properties and applicable conditions
| Property | Standard requirements and applicable conditions |
|---|---|
| Annealed hardness HBW / maximum | 255 |
| Hardening test | Austenitizing 1190±10 °C ; oil or salt bath; oil quenching in case of dispute ; minimum tempering temperature 560±10 °C ; hardness≥62 HRC; testing in accordance with B.3. |
Standard reference and ordering limitations
- Cast analysis, mass fraction %. A dash means the standard gives no separate requirement; it does not mean zero.
- Unlisted elements shall not be intentionally added without purchaser consent, except additions needed to finish steelmaking.
- Permissible product-analysis deviations do not expand the default cast-analysis limits.
- Tool-steel classification and hardness depend on application, heat treatment and test conditions; they do not establish cold-heading suitability or guarantee properties in an arbitrary condition.
- Table 8: high-speed tool steels; cast analysis, wt%; default Mn≤.40%, P and S each ≤.030%.
- Unlisted elements shall not be intentionally added without purchaser consent, except to finish steelmaking. Dashes are not entered as zero.
- Annealed and cold-drawn (+A+C) hardness may be 50 HBW higher than annealed (+A); annealed and cold-rolled (+A+CR) may be 70 HBW higher. Only HS6-5-2C and HS6-5-2-5 may use S 0.060%–0.150% with Mn≤0.80% by agreement under Table 8 note f. This exception does not apply to other grades.
Reference: BS EN ISO 4957:2018，Table 8 and notes a–f. Website information does not replace the official standard, order specifications or material certificates.
Illustrative packaging
Product and packaging images are illustrations; they do not identify a heat, stock availability, dimensions or a default delivery method. Confirm product form, delivery condition, packaging and acceptance requirements in the enquiry and order.