Case-hardening steel
18CrNiMo7-6 / 1.6587 case-hardening steel
18CrNiMo7-6 is an alloy case-hardening steel with Werkstoffnummer 1.6587 to EN 10084. Nickel, chromium and molybdenum give a hard case and a tough core in coarse cross-sections. It is not a QT shaft steel like 34CrNiMo6. Drawings may specify ZF1A or the older 17CrNiMo6; the EN designation we trade under is 18CrNiMo7-6 / 1.6587. We do not publish those names as identical chemistry. INDUSTRISTÅL supplies bar, cuts to length and ships with 3.1.
- Werkstoffnummer
- 1.6587
- Standard
- EN 10084
- Drawing names
- ZF1A, 17CrNiMo6 (older DIN)
- Typical condition
- +A / +FP depending on mill
Typical applications
- Large gears
- Planetary stages
- Case-hardened shafts in coarse Ø
Delivery conditions
- +A / +FP depending on mill
- not +QT as a shaft steel
Designations
- W.Nr.
- 1.6587
- EN standard
- 18CrNiMo7-6
- DIN
- 18CrNiMo7-6
- Group
- Alloy engineering steel
Heat treatment
Carburising and hardening. Confirm the condition on the certificate before the heat is committed.
Sawing and machining
Cutting to length. State whether ZF1A is a drawing name or a separate requirement. Forged blank when rolled bar does not cover the size.
Certificates and documentation
EN 10204/3.1 as standard. Confirm the designation (18CrNiMo7-6 / ZF1A) on the certificate.
Dimension programme
| Form | Range | Note |
|---|---|---|
| Round bar | Ø80–250 mm, above that subject to mill | Heavy gears. ZF1A is a trade alias — W.Nr. 1.6587 on the certificate. Not 34CrNiMo6. |
Parts of the range are held by European partners; other dimensions can be sourced. The range is not a current stock status in every diameter — stock is confirmed on enquiry.
Frequently asked questions
- What is 18CrNiMo7-6?
- 18CrNiMo7-6 / 1.6587 is the heavy-duty case-hardening steel to EN 10084. Hard case, tough core in large cross-sections. Drawings may specify ZF1A.
- Is ZF1A the same as 18CrNiMo7-6?
- Drawings and supplier lists often use ZF1A for W.Nr. 1.6587. We supply to the name and the certificate you can approve – not as a promise of a particular mill list. ZF1 without the A is 17CrNi6-6 / 1.5918.
- Is 17CrNiMo6 the same as 18CrNiMo7-6?
- 17CrNiMo6 is an older DIN drawing name in the same family. The EN designation is 18CrNiMo7-6 / 1.6587. We supply to the EN name and the certificate – not as a promise of identical analysis.
- Is 18CrNiMo7-6 a quenched and tempered steel?
- No. It is case-hardened. 34CrNiMo6 is the QT shaft steel at the heavy end.
- Can you supply 18CrNiMo7-6 round bar?
- Yes. State Ø, length and condition – and whether the drawing says ZF1A. Large gears may be forged.
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Looking for 18CrNiMo7-6 / 1.6587?
State Ø or cross-section, length, quantity and condition – and the designation the certificate must carry. We cut to length and ship with EN 10204/3.1.