1.0737 (11SMnPb37) vs 1.0718 (11SMnPb30)
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.
1.0737 (11SMnPb37)
Carbon Steel
11SMnPb37 (1.0737) pushes the EN leaded free-cutting concept furthest: sulfur raised to 0.34–0.40% and manganese to 1.00–1.50% on top of the standard lead addition, for maximum chip-breaking and cutting speed on the most demanding automatic-lathe work.
Standards: DIN 1.0737 (11SMnPb37) · AISI 12L14 (near)
1.0718 (11SMnPb30)
Carbon Steel
11SMnPb30 (1.0718) is the leaded version of 11SMn30 and one of the fastest-machining bar steels in the EN system. The lead addition (0.20–0.35%) lubricates the cutting zone, extending tool life and surface finish in mass-production turning.
Standards: DIN 1.0718 (11SMnPb30) · AISI 12L14 (near)
Chemical composition compared (%)
| Element | 1.0737 (11SMnPb37) | 1.0718 (11SMnPb30) |
|---|---|---|
| C | ≤0.14 | ≤0.14 |
| Si | ≤0.05 | ≤0.05 |
| Mn | 1.00–1.50 | 0.90–1.30 |
| P | ≤0.11 | ≤0.11 |
| S | 0.34–0.40 | 0.27–0.33 |
| Pb | 0.20–0.35 | 0.20–0.35 |
Properties compared
| Property | 1.0737 (11SMnPb37) | 1.0718 (11SMnPb30) |
|---|---|---|
| Tensile strength | 390–530 MPa (delivery-condition dependent) | 380–510 MPa (delivery-condition dependent) |
| Machinability | Outstanding (highest-sulfur EN leaded grade) | Outstanding (leaded) |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
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: 1.0737 (11SMnPb37) · 1.0718 (11SMnPb30). Substitution decisions for certified parts stay with the design authority.