10B21 vs 1022
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.
10B21
Carbon Steel
10B21 is a boron-treated cold-heading steel: a trace of boron multiplies the hardenability of a 0.20% carbon steel, letting fasteners reach property classes 8.8–10.9 after quenching and tempering. It is supplied as wire rod and wire for high-volume bolt production.
Standards: AISI 10B21 · GB ML10B21 family (near)
1022
Carbon Steel
1022 is a low carbon, higher manganese steel with better hardenability than 1020 at the same carbon level. It is used for carburized parts and moderately loaded components where 1020 would be too soft in the core.
Standards: DIN C22 (near) · AISI 1022 · JIS S20C (near) · GB 20Mn (near)
Chemical composition compared (%)
| Element | 10B21 | 1022 |
|---|---|---|
| C | 0.18–0.23 | 0.18–0.23 |
| Mn | 0.70–1.00 | 0.70–1.00 |
| P | ≤0.035 | ≤0.040 |
| S | ≤0.035 | ≤0.050 |
| B | 0.0005–0.003 | — |
Properties compared
| Property | 10B21 | 1022 |
|---|---|---|
| Tensile strength | 800–1050 MPa (Q&T fastener duty, property class 8.8–10.9 range) | 400–480 MPa (hot rolled, typ.) |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Weldability | — | Good |
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: 10B21 · 1022. Substitution decisions for certified parts stay with the design authority.