What is specification of ASTM A709 Grade HPS 50W Weahtering Steel Plate

ASTM A709 Grade HPS 50W is a high-performance, low-alloy structural steel designed specifically for bridge construction. It provides a minimum yield strength of 345 MPa and delivers outstanding atmospheric corrosion resistance, making it suitable for long-service bridge structures without frequent maintenance.

This grade can be supplied in multiple delivery conditions, including as-rolled, controlled rolled, TMCP (with or without accelerated cooling), or quenched and tempered, depending on project requirements.

A709 Grade HPS 50W products are available as structural shapes, plates, bars, and quenched and tempered alloy steel intended for critical structural components in bridge applications. Heat analysis is conducted to determine the required levels of carbon, manganese, phosphorus, sulfur, silicon, copper, and other alloying elements.

Standard: ASTM A709

Grade: HPS 50W

Thickness: 8–300 mm

Width: 1500–4020 mm

Length: 3000–27000 mm

Forms Available:
Coils, foils, rolls, plain sheets, shim sheets, flats, bars

Surface Finish:
Hot Rolled (HR), Cold Rolled (CR), 2B, 2D, BA, No. 8, Satin (with optional PVC coating)

Hardness Options:
Soft, Half Hard, Hard, Quarter Hard, Spring Hard

Primary Application:
Bridge structural steel

For quenched and tempered A709 Grade HPS 50W steel:

Heat to ≥1600°F (≈900°C)

Quench in water or oil

Temper at ≥1100°F (≈590°C)

All heat-treatment parameters must be listed on the test certificate

Steel plates supplied under this specification must comply with the applicable requirements of ASTM A6/A6M for the ordered product type. In any case of conflicting requirements, ASTM A709 takes precedence.

High performance & high strength

Superior atmospheric corrosion resistance

Extended service life with minimal maintenance

Ideal for bridges where durability, weathering resistance, and structural reliability are essential

Excellent for applications where unpainted steel is preferred

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