nm500 steel used for bridges sch 40 welded pipe

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Quenching Improve the hardness of NM500 steel used for bridges steel, Annealing is refine the grain size, homogenization, reduce hardness, improve the plasticity and eliminate interna stress. Normalizing refine grain , improve the impact toughness of NM500 steel used for bridges steel and comprehensive mechanical properties.

A514 gr.E quenched and tempered alloy steel chemical composition (melting analysis)%C: 0.12-0.20, Si: 0.20-0.40, Mn: 0.40-0.70, P max.: 0.035, S max.: 0.035, Cr: 1.40-2.00, Mo: 0.40-0.60, Ti: 0.01-0.10, Cu: 0.15-0.50, B: 0.001-0.005The mechanical properties in thickness (mm)T≤65Yield strength (≥Mpa): 690Tensile strength (Mpa):760-895Elongation in ≥,%: 18

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