ASTM A709 Grade HPS 100W steel plate is a high-performance weathering steel developed for bridge construction and structural applications requiring exceptional strength, toughness, and atmospheric corrosion resistance.
The "HPS" designation stands for High Performance Steel, which provides superior weldability, enhanced toughness at low temperatures, and extended service life compared to conventional bridge steels.
With a minimum yield strength of 690 MPa (100 ksi) and excellent Charpy V-Notch toughness, A709 Gr HPS 100W is widely used in long-span bridges, heavy load-bearing structures, and infrastructure projects exposed to harsh weather conditions.
Chemical Composition (% Maximum)
| Element | C | Mn | P | S | Si | Cr | Ni | Cu | Mo | V | Nb |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Typical Range | ≤ 0.11 | 0.50–1.65 | ≤ 0.030 | ≤ 0.010 | 0.15–0.50 | 0.40–0.65 | 0.25–0.55 | 0.25–0.45 | ≤ 0.10 | ≤ 0.06 | ≤ 0.02 |
Mechanical Properties
| Property | Metric | Imperial | Description |
|---|---|---|---|
| Yield Strength (Min) | 690 MPa | 100 ksi | Minimum specified yield strength |
| Tensile Strength | 760–895 MPa | 110–130 ksi | High tensile strength for structural reliability |
| Elongation (Min, 200mm) | 16% | 16% | Ensures ductility and toughness |
| Charpy V-Notch Toughness | ≥ 70 J @ -40°C | ≥ 52 ft·lbf @ -40°F | Excellent low-temperature impact resistance |
Applications
ASTM A709 Grade HPS 100W steel plate is primarily used in:
- Bridge Construction: Long-span, arch, and cable-stayed bridges
- Highway Infrastructure: Load-bearing girders and supports
- Marine and Coastal Structures: Resistant to atmospheric and saltwater corrosion
- Heavy Equipment & Crane Booms: High strength-to-weight ratio applications
- Railway & River Crossings: Structural components exposed to outdoor environments
