UK B.S. BS S 126, S.126 Specialsteel Specification for aircraft material. 23/14 chromium-nickel heat-resisting steel (niobium stabilized) (35 tonf/sq in: limiting ruling section 6 in) and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Standard | Country | Application | 
|---|---|---|---|---|---|
| Steel Grades | Specialsteel | S.126 | B.S. | UK | Specification for aircraft material. 23/14 chromium-nickel heat-resisting steel (niobium stabilized) (35 tonf/sq in: limiting ruling section 6 in) | 
| C | Si | Mn | P | S | Cr | Ni | Mo | Nb | 
|---|---|---|---|---|---|---|---|---|
| ≤0.15 | 0.20 -1.00 | 0.50 -2.00 | ≤0.035 | ≤0.025 | 22.00 -25.00 | 13.00 -16.00 | ≤ ≥ | ≤8×C | 
| 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) | 
|---|---|---|---|---|---|---|
| 283 (≥) | 236 (≥) | 13 | 14 | 13 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 343 | 
| 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 | 
|---|---|---|---|---|---|---|---|
| 34 | - | - | 0.41 | - | |||
| 861 | 294 | - | 41.3 | 242 | - | ||
| 417 | - | 21 | 41.2 | 424 | 122 | 
Heat treated : 1757°C - 1639°C
| BS S 126 | Specification for aircraft material. 23/14 chromium-nickel heat-resisting steel (niobium stabilized) (35 tonf/sq in: limiting ruling section 6 in) | BS-S-126.pdf | 
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