30 vs 1030
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
30
Carbon Steel
30 is the GB/T 699 grade matching AISI 1030 / JIS S30C — the first GB carbon grade with useful quench-and-temper response in small sections.
Standards: DIN 1.0528 (C30) · AISI 1030 · JIS S30C · GB 30 (GB/T 699)
1030
Carbon Steel
1030 is a medium carbon steel at the lower edge of the heat-treatable range: it responds to quenching in thin sections and to induction hardening on shafts. It is a widely used forging steel for automotive and agricultural parts.
Standards: DIN 1.0528 (C30) · AISI 1030 · JIS S30C · GB 30
Chemical composition compared (%)
| Element | 30 | 1030 |
|---|---|---|
| C | 0.27–0.34 | 0.28–0.34 |
| Si | 0.17–0.37 | — |
| Mn | 0.50–0.80 | 0.60–0.90 |
| P | ≤0.035 | ≤0.040 |
| S | ≤0.035 | ≤0.050 |
| Cr | ≤0.25 | — |
Properties compared
| Property | 30 | 1030 |
|---|---|---|
| Tensile strength | ≥500 MPa (GB/T 699 reference, normalized blank) | 470–560 MPa (normalized, typ.) |
| Yield strength | ≥295 MPa (reference) | — |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Hardness | — | 50+ HRC surface by induction (thin sections) |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: 30 · 1030. Substitution decisions for certified parts stay with the design authority.