Q390D steel plate and production method thereof
A steel plate and stage technology, applied in the field of Q390D steel plate and its production, can solve the problems of easy cracks in the slab, poor surface quality of the steel plate, high alloy cost, etc., and achieve good surface quality, low cost, and good matching between strength and toughness Effect
Inactive Publication Date: 2020-06-26
BAOTOU IRON & STEEL GRP
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The invention discloses a Q390D steel plate and a production method thereof and belongs to the field of structural steel. The Q390D steel plate comprises the chemical components in percent by mass: 0.16-0.18% of C, 0.24-0.34% of Si, 0.5-0.6% of Mn, 0.06-0.07% of Ti, less than or equal to 0.015% of P, less than or equal to 0.004% of S, 0.0011-0.0002% of Ca, 0.02-0.035% of Als and the balance iron and inevitable impurities. By means of proper smelting, continuous casting, heating, rolling and controlled cooling processes, for the obtained Q390D steel plate, the yield strength is between 413 MPaand 456 MPa, the tensile strength is between 522 MPa and 573 MPa, the yield ratio is less than or equal to 0.80, the ductility is between 21.5% and 28%, and the ballistic work at 20 DEG C below zero is between 153 J and 195 J.
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