The carbon Comparison of A572 Gr.50 and SA283 Grade C carbon plate content of the pipeline steel is required to be low, and the strength of the pipeline steel is ensured by increasing the manganese content and adding trace elements such as niobium, titanium, vanadium and molybdenum. For pipeline steel, in addition to the required strength and plasticity index, the requirement for toughness index is an outstanding feature, including the impact energy of pipeline steel plate, impact transition temperature and toughness index of welding heat affected zone and welding metal. In addition, there are requirements for strain aging, weldability, stress corrosion and other indicators.
QSTE550TM cold formed hot rolled pickled automotive structural steelQSTE550TM chemical composition (melting analysis)%C: ≤0.12, Si: ≤0.35, Mn: ≤1.70, P: ≤0.03, S: ≤0.025, Ti: ≤0.22, Nb: ≤0.09, Al: ≥0.015Mechanical propertiesYield strength MPa: ≥500Tensile strength MPa: 550-700
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