Y40Mn vs 1141
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.
Y40Mn
Carbon Steel
Y40Mn is the top-strength grade of China’s GB/T 8731 free-cutting family: 0.40% carbon with 1.20–1.55% manganese (the concept of AISI 1141/1144) plus 0.15–0.25% sulfur for chip control. It is used where turned parts must carry real loads after heat treatment.
Standards: AISI 1141 (near) · GB Y40Mn (GB/T 8731)
1141
Carbon Steel
1141 pairs 1040-class carbon with 1.35–1.65% manganese and resulfurization, giving free-machining bar with better hardenability than 1140. It is a popular cold drawn grade for machined shafts and studs.
Standards: AISI 1141
Chemical composition compared (%)
| Element | Y40Mn | 1141 |
|---|---|---|
| C | 0.37–0.44 | 0.37–0.45 |
| Si | 0.15–0.35 | — |
| Mn | 1.20–1.55 | 1.35–1.65 |
| P | ≤0.06 | ≤0.040 |
| S | 0.15–0.25 | 0.08–0.13 |
Properties compared
| Property | Y40Mn | 1141 |
|---|---|---|
| Tensile strength | 590–740 MPa (hot rolled, typ.) | 560–670 MPa (hot rolled, typ.) |
| 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: Y40Mn · 1141. Substitution decisions for certified parts stay with the design authority.