SAE J1268 15B21H Introduce
SAE J1268 15B21H Steel is a high-strength, medium-carbon, low-alloy steel that is often used for general and structural engineering applications. The low-alloy composition of the steel allows for a high strength-to-weight ratio and the medium-carbon content provides good strength at elevated temperatures. This steel is also resistant to corrosion and is frequently used in applications where weathering or corrosion is an issue.
SAE J1268 15B21H steel is available in sheet, plate, and bar forms, with a range of thicknesses. This steel can also be cold-drawn or hot-formed to achieve the desired shape and size. It is also machinable and can be cut, punched, and drilled easily. The steel is also highly weldable and can be arc-welded with a variety of electrodes.
Smelting temperature:1394°C - 1996°C
Application:Hardenability bands for carbon and alloy H steels
SAE J1268 15B21H Material Chemical Composition
The chemical composition of the SAE J1268 15B21H steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1500 | 0.3500 |
| Sulfur (S) | - | 0.0500 |
| PhOsphorus (P) | - | 0.0300 |
| Manganese (Mn) | 0.7000 | 1.2000 |
| Carbon (C) | 0.1700 | 0.2400 |
| Boron (B) | 0.0005 | 0.0030 |
SAE J1268 15B21H Material Mechanical Properties
The mechanical properties of the SAE J1268 15B21H steel are as follows:
| YieldRp0.2 | ≤ 515 (MPa) |
| TeileRm | ≤ 266 (MPa) |
| ImpactKV/Ku | 13(J) |
| ElongationA | 13% |
| Reduction in cross section on fractureZ | 11% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 113 |
SAE J1268 15B21H Material Thermal Properties
The thermal performance parameters of the SAE J1268 15B21H steel are as follows:
| Temperature (°C) | 42 | 351 | 256 |
| Modulus of elasticity (GPa) | - | 692 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 21.3 | 34.2 |
| Specific thermal capacity (J/kg·°C) | - | 442 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 214 |
| Poisson’s coefficient, ν | - | - | 141 |