UK B.S. BS 970-4, 331S42 Specialsteel Specification for wrought steels for mechanical and allied engineering purposes. Valve steels and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Standard | Country | Application | 
|---|---|---|---|---|---|
| Steel Grades | Specialsteel | 331S42 | B.S. | UK | Specification for wrought steels for mechanical and allied engineering purposes. Valve steels | 
| C | Si | Mn | P | S | Cr | Ni | Mo | W | 
|---|---|---|---|---|---|---|---|---|
| 0.37 -0.47 | 1.00 -2.00 | 0.50 -1.00 | ≤0.040 | ≤0.030 | 13.00 -15.00 | 13.00 -15.00 | 0.40 -0.70 | 2.20 -3.00 | 
| Yield Rp0.2 (MPa) | Tensile Rm (MPa) | Impact KV/Ku (J) | Elongation A (%) | Reduction in cross section on fracture Z (%) | As-Heat-Treated Condition | Brinell hardness (HBW) | 
|---|---|---|---|---|---|---|
| 694 (≥) | 893 (≥) | 24 | 21 | 41 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 444 | 
| Temperature (°C) | Modulus of elasticity (GPa) | Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) | Specific thermal capacity (J/kg·°C) | Specific electrical resistivity (Ω mm²/m) | Density (kg/dm³) | Poisson’s coefficient, ν | 
|---|---|---|---|---|---|---|---|
| 21 | - | - | 0.13 | - | |||
| 248 | 122 | - | 23.3 | 142 | - | ||
| 186 | - | 44 | 43.2 | 412 | 222 | 
Heat treated : 1479°C - 1439°C
| BS 970-4 | Specification for wrought steels for mechanical and allied engineering purposes. Valve steels | BS-970-4.pdf | 
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