1.0737 (11SMnPb37) vs 12L14
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)
12L14
Carbon Steel
12L14 is the leaded free-cutting steel: lead, sulfur and phosphorus together give the highest machinability of any standard bar steel. It dominates high-volume turned parts where cycle time rules, at the cost of weldability and environmental restrictions on lead.
Standards: DIN 11SMnPb30 family (near) · AISI 12L14 · JIS SUM24L (near) · GB Y12Pb (near)
Chemical composition compared (%)
| Element | 1.0737 (11SMnPb37) | 12L14 |
|---|---|---|
| C | ≤0.14 | ≤0.15 |
| Si | ≤0.05 | — |
| Mn | 1.00–1.50 | 0.85–1.15 |
| P | ≤0.11 | 0.04–0.09 |
| S | 0.34–0.40 | 0.26–0.35 |
| Pb | 0.20–0.35 | 0.15–0.35 |
Properties compared
| Property | 1.0737 (11SMnPb37) | 12L14 |
|---|---|---|
| Tensile strength | 390–530 MPa (delivery-condition dependent) | 390–470 MPa (hot rolled, typ.) |
| Machinability | Outstanding (highest-sulfur EN leaded grade) | ≈160–170% of 1212 (typ. rating) |
| 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) · 12L14. Substitution decisions for certified parts stay with the design authority.