ASTM A709 is applicable to carbon steel and high-strength low-alloy structural steel, steel plates and bars for bridges, and quenched and tempered alloy steel structural steel plates. Among the nine steel grades available: A709-36, A709Gr50, A709Gr50S, A709Gr50W, A709GrHPS50W, A709GrHPS 70W, A709Gr100, A709Gr100W, A709GrHPS 100W.
Among them, the A709-50W, A709-HPS 50W, A709-HPS 70W, A709-100, A709-100W, A709-HPS 100W grades improve the resistance to atmospheric corrosion.
When steel has to be welded, it is a prerequisite for a welding process suitable for the type of steel and the intended use or intended use.
ASTM A709 steel plate manufacturing method: A709Gr36, A709Gr50 steel grades should be semi-killed steel or killed steel.
A709Gr50W, A709GrHPS 50W, A709GrHPS 70W rigid grade should be produced by fine grain process. A709GrHPS 50W, A709GrHPS 70W, A709GrHPS 100W grades should be produced by low hydrogen process, such as vacuum treatment in the steel manufacturing process, controlled heating of ingots and slabs, controlled slow cooling of ingots, slabs or steel plates.
A709Gr100, A709Gr100W, A709GrHPS 100W grades should meet the fine austenite grain size requirements.
A709GrHPS 50W, A709GrHPS 70W should be supplied in one of the following states: hot rolling, controlled rolling, TMCP, quenching and tempering.
