ISO 683-4 Grade 35SPb20 quenched and tempered (+QT)
ISO 683-4 Grade 35SPb20 quenched and tempered (+QT) introduction
The free-cutting steel 35SPb20, suitable for quenching and tempering, is used for bulk parts of mean strength, especially for lower requirements to ductility in transversal direction opposite to comparable C-steels (e.g. C35). Machinability enhancement is achievable by Pb-content. Application in automotive engineering, as well as in apparatus equipment and machine engineering (e.g. screws, nuts, small-size parts).
Equivalent material: EN 1.0756, ISO 35SPb20, DIN 1.0756, DIN 35SPb20, AFNOR 35SPb20, BS 35SPb20
ISO 683-4 Grade 35SPb20 quenched and tempered (+QT) general
| Property |
Temperature |
Value |
| Density |
20.0 °C |
Density of 7.85 g/cm³ |
ISO 683-4 Grade 35SPb20 quenched and tempered (+QT) thermal
| Property |
Temperature |
Value |
Comment |
| Coefficient of thermal expansion |
100.0 °C |
Coefficient of thermal expansion of 1.1E-5 1/K |
- |
| - |
200.0 °C |
Coefficient of thermal expansion of 1.18E-5 1/K |
- |
| - |
400.0 °C |
Coefficient of thermal expansion of 1.32E-5 1/K |
- |
| Max service temperature |
- |
Max service temperature of 500 °C |
Typical for Carbon Steel |
| Melting point |
- |
Melting point of 1380 - 1514 °C |
Typical for Medium Carbon Steel |
| Specific heat capacity |
20.0 °C |
Specific heat capacity of 420 J/(kg·K) |
- |
| - |
100.0 °C |
Specific heat capacity of 490 J/(kg·K) |
- |
| - |
200.0 °C |
Specific heat capacity of 530 J/(kg·K) |
- |
| - |
400.0 °C |
Specific heat capacity of 610 J/(kg·K) |
- |
| Thermal conductivity |
20.0 °C |
Thermal conductivity of 49 W/(m·K) |
- |
ISO 683-4 Grade 35SPb20 quenched and tempered (+QT) chemical
| Property |
Value |
| Carbon |
Carbon of 0.32 - 0.39 % |
| Lead |
Lead of 0.15 - 0.35 % |
| Manganese |
Manganese of 0.7 - 1.1 % |
| Phosphorus |
Phosphorus of 0.06 % |
| Silicon |
Silicon of 0.4 % |
| Sulfur |
Sulfur of 0.15 - 0.25 % |
ISO 683-4 Grade 35SPb20 quenched and tempered (+QT) electrical
| Property |
Temperature |
Value |
| Electrical resistivity |
20.0 °C |
Electrical resistivity of 1.2E-7 Ω·m |
ISO 683-4 Grade 35SPb20 quenched and tempered (+QT) mechanical
| Property |
Temperature |
Value |
Comment |
| Elastic modulus |
20.0 °C |
Elastic modulus of 210 GPa |
- |
| - |
200.0 °C |
Elastic modulus of 193 GPa |
- |
| - |
300.0 °C |
Elastic modulus of 185 GPa |
- |
| - |
400.0 °C |
Elastic modulus of 175 GPa |
- |
| Elongation |
20.0 °C |
Elongation of 15 - 17 % |
- |
| Poisson's ratio |
23.0 °C |
Poisson's ratio of 0.29 [-] |
Typical for Medium Carbon Steel |
| Shear modulus |
20.0 °C |
Shear modulus of 81 GPa |
- |
| Tensile strength |
20.0 °C |
Tensile strength of 550 - 780 MPa |
- |
| Yield strength |
20.0 °C |
Yield strength of 320 - 430 MPa |
- |
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