Properties
Through mid-1999, over 2,000 tons of HPS-70W steel have been used in bridge fabrication. The mechanical properties for 240 plates ranging in thicknesses from 0.5 to 3.1 in. (13-80 mm) are summarized in Figures 1-3. The excellent Charpy V-Notch impact properties are demonstrated in Figure 3. Furthermore, the calculated weathering index of HPS-70W for 28 production heats are shown in Figure 4. The goal of HPS-70W is to meet a minimum 6.5 weathering index according to G101. A minimum index of 6.0 is considered by G101 to provide a level of atmospheric corrosion resistance.

Figure 1: Production Results A709 HPS-70W Tensile Strength Data

Yield Strength Ultimate Tensile Strength

Figure 2: Production Results A709 HPS-70W Yield/Tensile Ratio

Plate Thicknesses 0.5 - 3.1in. (13-80 mm)

Figure 3: Production Results A709 HPS-70W CVN Impact Data @ -10ºF (23ºC)

Plate Thicknesses 0.5 - 3.1in. (13-80 mm)

Figure 4: ASTM G101 Weathering Index First 28 Heats of HPS-70W

Weathering Index