SAE J1268 1340 H Introduce
Steel is one of the most commonly used metals in the world, and is the backbone of the infrastructure that makes our modern world possible. One of the most commonly used grades of steel is SAE J1268 1340 H, which is an alloy of iron, chromium and molybdenum. One of the most important characteristics of steel is its ability to retain heat, and SAE J1268 1340 H has specific values for its thermal properties. Given its specific thermal properties, SAE J1268 1340 H is ideal for applications that require heat resistance and good tensile strength. Some of the applications for this grade of steel include automobile and aircraft components, medical equipment, and systems for cryogenic storage.
Smelting temperature:1135°C - 1558°C
Application:Hardenability bands for carbon and alloy H steels
SAE J1268 1340 H Material Mechanical Properties
The mechanical properties of the SAE J1268 1340 H steel are as follows:
| YieldRp0.2 | ≤ 536 (MPa) |
| TeileRm | ≤ 991 (MPa) |
| ImpactKV/Ku | 43(J) |
| ElongationA | 12% |
| Reduction in cross section on fractureZ | 44% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 121 |
SAE J1268 1340 H Material Thermal Properties
The thermal performance parameters of the SAE J1268 1340 H steel are as follows:
| Temperature (°C) | 12 | 897 | 565 |
| Modulus of elasticity (GPa) | - | 634 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 12 |
| Thermal conductivity (W/m·°C) | - | 42.3 | 14.2 |
| Specific thermal capacity (J/kg·°C) | - | 434 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.11 | - | - |
| Deity (kg/dm³) | - | - | 334 |
| Poisson’s coefficient, ν | - | - | 114 |