USA AMS SA-437/SA-437M, SA-437 Grade B4D Specialsteel Alloy Steel Turbine-Type Bolting Material Specially Heat Treated for High-Temperature Service and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Type | Standard | Country | Application | 
|---|---|---|---|---|---|---|
| Steel Grades | Specialsteel | SA-437 Grade B4D | Precipitation-Hardening | AMS | USA | Alloy Steel Turbine-Type Bolting Material Specially Heat Treated for High-Temperature Service | 
| C | Si | Mn | P | S | Ni | Cr | Al | Cu | Ti | Fe | Mo | Co | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ≤0.01 | ≤0.05 | ≤1.50 | ≤0.04 | ≤0.01 | ≤remaining | 0.50 -1.50 | 0.10 -0.50 | ≤0.50 | ≤ ≥ | 1.00 -6.00 | 26.00 -30.00 | ≤2.50 | 
| 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) | 
|---|---|---|---|---|---|---|
| 466 (≥) | 872 (≥) | 32 | 23 | 34 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 221 | 
| 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 | 
|---|---|---|---|---|---|---|---|
| 14 | - | - | 0.14 | - | |||
| 645 | 169 | - | 12.3 | 441 | - | ||
| 485 | - | 41 | 43.2 | 122 | 132 | 
Heat treated : 1714°C - 1923°C
| SA-437/SA-437M | Alloy Steel Turbine-Type Bolting Material Specially Heat Treated for High-Temperature Service | SA-437-SA-437M.pdf | 
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