China GB GB/T 1221 (1992) , GB/T 12773 (1991) , 4Cr10Si2Mo Specialsteel Heat-resisting steel bars and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Type | Standard | Country | Application | 
|---|---|---|---|---|---|---|
| Steel Grades | Specialsteel | 4Cr10Si2Mo | Martensite | GB | China | Heat-resisting steel bars | 
| C | Si | Mn | P | S | Cr | Mo | 
|---|---|---|---|---|---|---|
| 0.35 -0.45 | 1.90 -2.60 | ≤0.70 | ≤0.035 | ≤0.60 | 9.00 -10.50 | 0.70 -0.90 | 
| 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) | 
|---|---|---|---|---|---|---|
| 136 (≥) | 828 (≥) | 43 | 42 | 13 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 233 | 
| 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 | 
|---|---|---|---|---|---|---|---|
| 44 | - | - | 0.14 | - | |||
| 396 | 293 | - | 44.3 | 111 | - | ||
| 789 | - | 21 | 13.2 | 413 | 244 | 
Heat treated : 1768°C - 1782°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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