1070 vs 1075
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.
1070
Carbon Steel
1070 is a high carbon steel for springs and cutting/wear applications needing more hardness than 1060/1065 deliver. It is supplied as bar, strip and wire for spring making.
Standards: DIN C70 type (near) · AISI 1070 · GB 70
1075
Carbon Steel
1075 is a high carbon steel with slightly lower manganese than 1070/1080, widely traded as spring strip and bar. It takes a keen edge and a reliable spring temper in thin sections.
Standards: DIN C75 type (near) · AISI 1075 · JIS SK5 family (near) · GB 75
Chemical composition compared (%)
| Element | 1070 | 1075 |
|---|---|---|
| C | 0.65–0.75 | 0.70–0.80 |
| Mn | 0.60–0.90 | 0.40–0.70 |
| P | ≤0.040 | ≤0.040 |
| S | ≤0.050 | ≤0.050 |
Properties compared
| Property | 1070 | 1075 |
|---|---|---|
| Tensile strength | 730–880 MPa (normalized, typ.) | 760–920 MPa (normalized, typ.) |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Hardness (spring temper) | — | 42–50 HRC typical |
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: 1070 · 1075. Substitution decisions for certified parts stay with the design authority.