GCr15
Data verifiedGCr15 is China’s standard bearing steel (GB/T 18254), the domestic designation of the 52100/100Cr6/SUJ2 family. Chinese mills produce it in very large tonnage for bearing rings, rolling elements and precision parts.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.95–1.05 |
| Si | 0.15–0.35 |
| Mn | 0.25–0.45 |
| P | ≤0.025 |
| S | ≤0.025 |
| Cr | 1.40–1.65 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Spheroidize annealed |
| Hardness (hardened) | 61–65 HRC |
| Density | 7.85 g/cm³ |
Heat treatment
Spheroidize anneal per GB/T 18254; harden 835–860 °C oil; temper 150–180 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.3505 (100Cr6) |
| aisi | 52100 |
| jis | SUJ2 |
| gb | GCr15 (GB/T 18254) |
Compare side by side: GCr15 vs 52100 · GCr15 vs 100Cr6
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Bearing rings and rolling elements, precision shafts, cold rolls, gauges.
Processing: As 52100; specify the GB/T 18254 quality level (inclusion/spheroidization class) on the order for fatigue-critical parts.
Need GCr15 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 18254 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.