ASTM A709 Grade HPS70W steel specification covers carbon and high-strength low alloy steel structural shapes, plates and bars, and quenched and tempered alloy steel for structural plates intended for use in bridges.
ASTM A709 Grade HPS70W material chemical composition:
| Grade | Mn | C | P | S | Si | Cu | Ni | |
| ≤2.5in | >2.5in | |||||||
| HPS70W | 1.10-1.35 | 1.10-1.50 | 0.11 max | 0.020max | 0.006max | 0.30-0.50 | 0.25-0.40 | 0.25-0.40 |
ASTM A709 Grade HPS70W structural steel mechanical properties
| Grade | Steel plate thickness,mm | Section steel thickness,mm | Yield strength [mpa] | Tensile strength [mpa] | Elongation min % | |||
| Steel plate | Section steel | |||||||
| 8in[200mm] | 2in[50mm] | 8in[200mm] | 2in[50mm] | |||||
| HPS70W | ≤100 | all | [485]min | 585-760 | ... | 19 | ... | ... |
For quenching and tempering treatment, the steel should be heated to not less than 1650oF [900oC], water quenching or oil quenching and tempering temperature is not lower than 1100oF [590oC].
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