概述
2017A-T451 is a European designation (EN AW-2017A) heat-treatable aluminum-copper alloy (2xxx series) supplied in the T451 temper. The T451 temper indicates the material has been solution heat-treated, stress-relieved by controlled stretching (permanent set 1.5–3%), and then naturally aged to a substantially stable condition.
描述（英文）
2017A-T451 aluminum alloy offers a balanced combination of high static strength, excellent machinability, good fatigue performance, and adequate corrosion resistance when properly protected. The T451 temper (solution heat-treated + stress-relieved by stretching + naturally aged) provides improved dimensional stability during and after machining, making it particularly suitable for thick plate, bar, and forged parts used in aerospace structural applications, mechanical assemblies, and precision machined components. The alloy is weldable only by specialized techniques (friction or flash welding) and is typically protected by alodine or anodizing for corrosion resistance.
尺寸范围
- Sheet: thickness 0.5–6 mm, width up to 2000 mm, length up to 6000 mm
- Plate: thickness 6–150 mm, width up to 2500 mm, length up to 6000 mm
牌号标准
| 标准体系 | 数值 |
|---|---|
| European | EN 485-2008 |
| American | ASTM B209 |
化学成分
| 元素 | 数值 |
|---|---|
| Si | 0.20–0.8 |
| Fe | ≤0.7 |
| Cu | 3.5–4.5 |
| Mn | 0.4–1.0 |
| Mg | 0.4–1.0 |
| Cr | ≤0.10 |
| Ni | - |
| Zn | ≤0.25 |
| Ti | ≤0.15 (Ti+Zr ≤0.20) |
| Others | each—≤0.05 |
| Others | total—≤0.15 |
| Al | Balance |
机械性能
| productCenter.property | 数值 |
|---|---|
| Tensile strength (Rm)(Typical, T451, sheet & plate per EN 485-2) | 390–425 MPa |
| Yield strength (Rp0.2)(Typical, T451, sheet & plate per EN 485-2) | ≥270 MPa |
| Elongation at break (A50mm) | ≥12 % |
| Brinell hardness | 110 HB |
物理性能
| 性能 | 单位 | 数值 |
|---|---|---|
| Density | g/cm³ | 2.80 g/cm³ |
应用场景
- Aerospace structural components (wing ribs, fuselage frames, fittings)
- Aircraft high-strength machined parts
- Defense and military equipment
- Gears, shafts, couplings, hydraulic manifolds
- Truck and bus body structures
- High-stress mechanical components
- Missile and rocket components
- Racing and high-performance automotive parts
- Forgings for landing gear and structural assemblies