1.2550 vs S7
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.
1.2550
Tool Steel
1.2550 (60WCrV7) is the European tungsten shock-resisting tool steel, the close counterpart of AISI S1. It is a staple for chisels, punches and shear blades across European shops.
Standards: DIN 1.2550 · AISI S1 (close) · GB 6CrW2Si (near)
S7
Tool Steel
S7 is an air-hardening shock-resisting steel with 3.25% chromium and molybdenum, combining S-class toughness with low distortion and some hot hardness. It bridges cold work, impact tooling and light hot work.
Standards: DIN 1.2357 (close) · AISI S7 · GB 5Cr3Mn1SiMo1 (near)
Chemical composition compared (%)
| Element | 1.2550 | S7 |
|---|---|---|
| C | 0.55–0.65 | 0.45–0.55 |
| Si | 0.50–0.80 | 0.20–1.00 |
| Mn | 0.15–0.45 | 0.20–0.90 |
| Cr | 0.90–1.20 | 3.00–3.50 |
| W | 1.80–2.10 | — |
| V | 0.10–0.20 | ≤0.35 |
| Mo | — | 1.30–1.80 |
Properties compared
| Property | 1.2550 | S7 |
|---|---|---|
| Delivery condition | Annealed | Annealed |
| Hardness (hardened) | 50–58 HRC | 52–60 HRC |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Toughness | High (shock-resisting class) | Outstanding, air hardening |
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: 1.2550 · S7. Substitution decisions for certified parts stay with the design authority.