Products Description
A709GrHPS 70W steel plate owned the minimum yield strength at 485 Mpa and tensile strength between 585Mpa and 760Mpa.So steel plate A709Gr.HPS 70W is mainly used under high strength situiations outside or bad weathering owned its weathering resistance property.
Now Gnee Steel offer the maximum thickness of A709 Gr.HPS 70W till 350mm with DNV approved which can be also used in oil and offshore platforms.
Mechnical property for A709 Grade HPS 70 steel plate
| Yield strength (≥Mpa) | Tensile strength (Mpa) | Elongation in ≥,% | |
| 485 | 585-760 | 200mm | 50mm |
| ... | 19 | ||
Chemical composition for A709 Grade HPS 70 steel plate (Heat Analysis Max%)
| Main chemical elements composition of A709 Grade HPS 70 steel plate | |||||||||||
| C | Si | Mn | P | S | Ni | Cr | Cu | V | Mo | Al | N |
| 0.11 | 0.30-0.50 | 1.10-1.35 | 0.02 | 0.006 | 0.25-0.40 | 0.45-0.70 | 0.25-0.40 | 0.04-0.08 | 0.02-0.08 | 0.01-0.04 | 0.015 |
Products Applications
These carbon and high-strength low alloy (HSLA) steel plates, structural shapes, and bars-along with quenched and tempered alloy steel plates-are primarily designed for bridge construction and other demanding structural applications. Their excellent strength-to-weight ratio, toughness, and weldability make them essential materials for modern infrastructure projects.
In bridge engineering, these steels are used to manufacture main girders, truss members, deck plates, stiffeners, and connection plates that carry both static and dynamic loads. Due to their high yield strength (typically between 345–690 MPa) and superior fatigue resistance, they ensure the long-term safety and stability of highway bridges, railway bridges, suspension bridges, and cable-stayed structures.
The HSLA and quenched & tempered steel plates are especially suitable for long-span bridges where reducing structural weight is critical to improving efficiency and lowering construction costs. Their excellent impact toughness at low temperatures also enables safe use in cold or marine environments, such as coastal bridges, river crossings, and elevated viaducts.
Beyond bridges, these steels are also widely used in high-rise buildings, cranes, transmission towers, and offshore platforms, where high strength, corrosion resistance, and weldability are equally important. By combining mechanical performance with economic value, they contribute to more durable, lightweight, and sustainable structural designs across multiple engineering sectors.
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