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ASTM A709 Grade HPS70W steel
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ASTM A709 Grade HPS70W steel

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 ... ...

HPS70W steel heat treatment:

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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