SAE J1268 4027H Introduce
One of the most versatile types of steel is SAE J1268 4027H steel, which features a unique chemical composition, providing superior performance and protection against rust. SAE J1268 4027H steel contains up to 0.2% silicon, which is known to improve its strength and durability. As a result, the steel has a higher yield strength than other low-carbon steels and can withstand higher temperatures without becoming brittle. In addition, silicon also promotes a good surface finish and prevents corrosion by reducing the amount of oxygen that reaches the steel's surface, which can help protect it from rust and corrosion. The amount of chromium present in SAE J1268 4027H steel can also vary depending on the application. In general, the higher the chromium content, the greater the steel's corrosion resistance. Chromium is an important element for steel because it forms a thin, adherent layer on the surface of the steel that acts as a protective barrier against water and various types of corrosive agents.
Smelting temperature:1646°C - 1588°C
Application:Hardenability bands for carbon and alloy H steels
SAE J1268 4027H Material Chemical Composition
The chemical composition of the SAE J1268 4027H steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1500 | 0.3500 |
| Sulfur (S) | - | 0.0400 |
| PhOsphorus (P) | - | 0.0300 |
| Nickel (Ni) | - | 0.2500 |
| Molybdenum (Mo) | 0.2000 | 0.3000 |
| Manganese (Mn) | 0.6000 | 1.0000 |
| Copper (Cu) | - | 0.3500 |
| Chromium (Cr) | - | 0.2000 |
| Carbon (C) | 0.2400 | 0.3000 |
SAE J1268 4027H Material Mechanical Properties
The mechanical properties of the SAE J1268 4027H steel are as follows:
| YieldRp0.2 | ≤ 775 (MPa) |
| TeileRm | ≤ 597 (MPa) |
| ImpactKV/Ku | 43(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 22% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 233 |
SAE J1268 4027H Material Thermal Properties
The thermal performance parameters of the SAE J1268 4027H steel are as follows:
| Temperature (°C) | 41 | 552 | 842 |
| Modulus of elasticity (GPa) | - | 447 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 11 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 42.2 |
| Specific thermal capacity (J/kg·°C) | - | 224 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.13 | - | - |
| Deity (kg/dm³) | - | - | 243 |
| Poisson’s coefficient, ν | - | - | 324 |