540MPa grade hot-rolled pickled steel plate and manufacturing method thereof
A hot-rolled pickling and steel plate technology, which is applied in the field of metal materials, can solve problems such as non-conformity, and achieve the effects of reducing load, improving hardenability, and refining structure
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[0025] The present invention is a 540MPa grade hot-rolled pickled steel sheet. The chemical composition of the hot-rolled pickled steel sheet is calculated by mass percentage: C 0.15%~0.25%, Si 0.01%~0.06%, Mn 0.80%~1.30%, Al 0.01%~0.06%, and 0.015%~0.050% Nb and / or 0.30%~0.40% Cr, and limit P<0.010%, S<0.005%, the balance is Fe and unavoidable impurities.
[0026] The final structure of the hot-rolled pickled steel sheet is composed of ferrite, pearlite and a small amount of bainite, and its structure is 55%-65% of ferrite, 30%-40% of pearlite and shellfish in volume percentage. 5% to 15% of tensite, yield strength>440MPa, tensile strength>540MPa, longitudinal elongation>26%.
[0027] The functions of the main chemical components in a 540MPa grade hot-rolled pickled steel sheet of the present invention are:
[0028] C: Carbon is the most important solid solution strengthening element in steel, and it is the guarantee of steel strength; considering the weldability and formability, t...
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