UK B.S. BS 3S 61 (1964), 3S.61 Specialsteel Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (35/45 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 | 3S.61 | B.S. | UK | Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (35/45 tonf/sq in: limiting ruling section 6 in) | 
| C | Si | Mn | P | S | Cr | Ni | Mo | Nb/Ti | 
|---|---|---|---|---|---|---|---|---|
| ≤0.12 | ≤0.80 | ≤1.00 | ≤0.030 | ≤0.025 | 11.50 -13.50 | ≤1.00 | ≤ ≥ | ≤ ≥ | 
| 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) | 
|---|---|---|---|---|---|---|
| 937 (≥) | 158 (≥) | 42 | 14 | 12 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 243 | 
| 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 | 
|---|---|---|---|---|---|---|---|
| 23 | - | - | 0.21 | - | |||
| 395 | 159 | - | 11.3 | 413 | - | ||
| 796 | - | 44 | 32.2 | 142 | 111 | 
Heat treated : 1864°C - 1381°C
| BS 3S 61 (1964) | Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (35/45 tonf/sq in: limiting ruling section 6 in) | BS-3S-61-(1964).pdf | 
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