Low-alloy Q345E medium plate and production process thereof
A thick steel plate and low alloy technology, applied in the field of medium and heavy plate production, can solve the problems of complex process and high production cost, and achieve the effect of reducing production cost, ensuring the matching of strength and plasticity, and reducing heating temperature
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[0013] The low-alloy Q345E medium-thick steel plate of the present invention contains the following chemical components in mass percentage (unit, wt%): C: 0.13-0.19, Si: 0.20-0.50, Mn: 1.30-1.60, P≤0.020, S≤0.010, Als: 0.015~0.050, others are Fe and residual elements;
[0014] Carbon equivalent [Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15]: ≤0.46.
[0015] In the aforementioned method, the thickness of the produced steel plate is 60 mm or less.
[0016] The technological process of the present invention is: high-quality molten iron, KR molten iron pretreatment, top-bottom combined blowing converter, LF furnace refining, slab stack cooling, heating furnace, rolling, ACC laminar flow cooling, hot straightener, stack cooling, refining Refinement, external inspection, flaw detection, and storage; in the refining step, argon is blown throughout the process, and refining slag is added, the alkalinity is controlled at 4.0-6.0, and the heating time is controlled at two times, the first heating...
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