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The effect of nitrogen on steel performance is similar to that of carbon and phosphorus. With the increase of ASTM A709 bridge steel plate nitrogen content, the strength of steel can be improved, plasticity especially toughness can be significantly reduced, weldability becomes worse, and cold brittleness is intensified. Nitrogen with aluminum, niobium, vanadium and other elements can reduce its adverse effects, improve the performance of ASTM A709 bridge steel plate steel, can be used as an alloying element of low alloy steel.
