UK B.S. BS 2S 111, 2S.111 Specialsteel Specification for aircraft material. Nickel-chromium-tungsten valve steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Standard | Country | Application | 
|---|---|---|---|---|---|
| Steel Grades | Specialsteel | 2S.111 | B.S. | UK | Specification for aircraft material. Nickel-chromium-tungsten valve steel | 
| C | Si | Mn | P | S | Cr | Ni | Mo | W | 
|---|---|---|---|---|---|---|---|---|
| 0.37 -0.47 | 1.00 -2.00 | 0.50 -1.00 | ≤0.035 | ≤0.025 | 13.00 -15.00 | 13.00 -15.00 | 0.40 -0.60 | 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) | 
|---|---|---|---|---|---|---|
| 453 (≥) | 278 (≥) | 34 | 43 | 14 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 124 | 
| 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 | 
|---|---|---|---|---|---|---|---|
| 22 | - | - | 0.22 | - | |||
| 231 | 943 | - | 23.3 | 223 | - | ||
| 749 | - | 11 | 44.2 | 222 | 433 | 
Heat treated : 1338°C - 1987°C
| BS 2S 111 | Specification for aircraft material. Nickel-chromium-tungsten valve steel | BS-2S-111.pdf | 
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