USA SAE A 646/A 646M (2011), A 646 Grade Nit. 135 Specialsteel Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Type | Standard | Country | Application | 
|---|---|---|---|---|---|---|
| Steel Grades | Specialsteel | A 646 Grade Nit. 135 | Precipitation-Hardening | SAE | USA | Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings | 
| C | Si | Mn | Cr | Ni | Mo | Co | W | Al | Cu | Ti | Fe | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.38 -0.43 | 0.20 -0.40 | 0.50 -0.70 | ≤ ≥ | 0.30 -0.40 | ≤ ≥ | ≤ ≥ | 0.95 -1.30 | ≤ ≥ | ≤ ≥ | ≤ ≥ | ≤ ≥ | 
| 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) | 
|---|---|---|---|---|---|---|
| 336 (≥) | 667 (≥) | 31 | 11 | 13 | 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 | 
|---|---|---|---|---|---|---|---|
| 13 | - | - | 0.32 | - | |||
| 198 | 184 | - | 34.3 | 132 | - | ||
| 179 | - | 42 | 44.2 | 313 | 221 | 
Heat treated : 1899°C - 1359°C
| A 646/A 646M (2011) | Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings | A-646-A-646M-(2011).pdf | 
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