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) | 
|---|---|---|---|---|---|---|
| 193 (≥) | 453 (≥) | 24 | 22 | 44 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 214 | 
| 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 | 
|---|---|---|---|---|---|---|---|
| 32 | - | - | 0.23 | - | |||
| 315 | 738 | - | 11.3 | 423 | - | ||
| 287 | - | 12 | 11.2 | 434 | 243 | 
Heat treated : 1897°C - 1316°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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