CrWMn
Data verifiedCrWMn is the classic Chinese gauge and die steel (GB/T 1299): a Cr-W-Mn oil-hardening grade famous for minimal size change on hardening, used across China for precision gauges and intricate dies.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.90–1.05 |
| Si | ≤0.40 |
| Mn | 0.80–1.10 |
| Cr | 0.90–1.20 |
| W | 1.20–1.60 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Annealed |
| Hardness (hardened) | 58–62 HRC |
| Density | 7.85 g/cm³ |
| Distortion | Very low (oil hardening) |
Heat treatment
Oil quench 800–830 °C; temper 150–200 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | O1 family (near) |
| jis | SKS2 (near) |
| gb | CrWMn (GB/T 1299) |
Compare side by side: CrWMn vs O1
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Gauges, intricate blanking dies, thread rolling dies, broaches, long taps and reamers.
Processing: Very low distortion makes it the default for precision tools that cannot be finish-ground after hardening.
FAQ
- CrWMn vs 9CrWMn?
- Different GB/T 1299 grades: CrWMn carries more chromium (0.90–1.20%) and tungsten (1.20–1.60%) than 9CrWMn (the O1 counterpart, Cr 0.50–0.80%, W 0.50–0.80%), giving CrWMn better wear resistance and hardenability.
Need CrWMn from stock?
Steel.Wiki is sponsored by Shenzhen NewAsia Special Steel (Nasteel), a special-steel stockholder in Shenzhen stocking mold, tool and alloy steels with EN 10204 3.1 certification.
Ask for a quotationVisit NasteelSource: GB/T 1299 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.