50
Data verified50 is the GB/T 699 grade matching AISI 1050 and JIS S50C, a higher-carbon machinery steel for parts needing spring-like hardness response without alloying.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.47–0.55 |
| Si | 0.17–0.37 |
| Mn | 0.50–0.80 |
| P | ≤0.035 |
| S | ≤0.035 |
| Cr | ≤0.25 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Tensile strength | ≥630 MPa (GB/T 699 reference, normalized blank) |
| Yield strength | ≥375 MPa (reference) |
| Density | 7.85 g/cm³ |
Heat treatment
Normalize 830–860 °C; flame/induction hardening for wear surfaces; water quench only in simple, thin shapes.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.0540 (C50) |
| aisi | 1050 |
| jis | S50C |
| gb | 50 (GB/T 699) |
Compare side by side: 50 vs 1050 · 50 vs S50C
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Shafts, gears, machine bases, mold plates, springs (light), wear parts.
Processing: As 1050/S50C; welding is difficult at this carbon level — preheat and post-heat are mandatory.
Need 50 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 699-2015 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.