UK B.S. BS HR 251 (1974), HR251 Specialsteel Specification for heat-resisting alloy plate, sheet and strip (Ni 25.5, Cr 14.7, Ti 1.8, Mn 1.5, Mo 1.2, V 0.3, Fe remainder) and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
Category | Class | Grade | Standard | Country | Application |
---|---|---|---|---|---|
Steel Grades | Specialsteel | HR251 | B.S. | UK | Specification for heat-resisting alloy plate, sheet and strip (Ni 25.5, Cr 14.7, Ti 1.8, Mn 1.5, Mo 1.2, V 0.3, Fe remainder) |
C | Si | Mn | P | S | Cr | Ni | Mo | Co | Ti | Fe | Al | V | B | Pb |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
≤0.06 | ≤0.50 | ≤2.00 | ≤0.020 | ≤0.015 | 13.50 -16.00 | 24.00 -27.00 | 1.00 -1.50 | ≤ ≥ | 1.70 -2.00 | ≤remaining | ≤0.35 | 1.70 -2.00 | 0.003 -0.010 | ≤0.005 |
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) |
---|---|---|---|---|---|---|
573 (≥) | 172 (≥) | 42 | 33 | 21 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 232 |
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 |
---|---|---|---|---|---|---|---|
42 | - | - | 0.24 | - | |||
355 | 555 | - | 22.3 | 444 | - | ||
855 | - | 24 | 24.2 | 232 | 212 |
Heat treated : 1562°C - 1554°C
BS HR 251 (1974) | Specification for heat-resisting alloy plate, sheet and strip (Ni 25.5, Cr 14.7, Ti 1.8, Mn 1.5, Mo 1.2, V 0.3, Fe remainder) | BS-HR-251-(1974).pdf |
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