China GB GB/T 1221 (1992) , GB/T 12773 (1991) , 5Cr21Mn9Ni4N Specialsteel Heat-resisting steel bars and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
Category | Class | Grade | Type | Standard | Country | Application |
---|---|---|---|---|---|---|
Steel Grades | Specialsteel | 5Cr21Mn9Ni4N | Austenite | GB | China | Heat-resisting steel bars |
C | Si | Mn | P | S | Ni | Cr | N |
---|---|---|---|---|---|---|---|
0.48 -0.58 | ≤0.35 | 8.00 -10.00 | ≤0.04 | ≤0.03 | 3.25 -4.50 | 20.00 -22.00 | 0.35 -0.50 |
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) |
---|---|---|---|---|---|---|
748 (≥) | 528 (≥) | 11 | 44 | 14 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 414 |
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 |
---|---|---|---|---|---|---|---|
12 | - | - | 0.33 | - | |||
764 | 644 | - | 41.3 | 234 | - | ||
774 | - | 14 | 43.2 | 424 | 242 |
Heat treated : 1749°C - 1369°C
GB/T 1221 (1992) | Heat-resisting steel bars | GB-T-1221--(1992)-.pdf |
GB/T 12773 (1991) | Valve steel bars for internal combustion engines - Technical requirements | GB-T-12773--(1991)-.pdf |
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