Q345-serie super-thick steel plate having low cost and guaranteeing performances and flaw detection, and production technology thereof
A technology of extra-thick steel plate and production process, which is applied in the field of steel, can solve the problems of not meeting market demand, high energy consumption, and poor quality of flaw detection
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[0011] The invention adopts the method of KR molten iron pretreatment, converter smelting, LF+VD, continuous casting, and 3800m wide and thick plate rolling mill to produce Q345 series extra-thick steel plates. Its technological process is: KR molten iron pretreatment, converter smelting, LF refining, vacuum refining (optional), continuous casting, slab heating, rolling, ACC laminar cooling, 11-roll hot straightening machine, slow cooling, heat treatment ( Optional), finishing, external inspection, flaw detection, storage.
[0012] The implementation is as follows:
[0013] Composition Design:
[0014] In the technical proposal, the P460NL1 (L2) extra-thick steel plate for pressure vessels with a thickness of 250 mm and guaranteed performance and flaw detection contains the following chemical composition in mass percentage (unit, wt%):
[0015] element C Si mn P S als Ti Cr Nb Novel ingredients 0.08~0.17 0.15~0.40 1.00~1.30 ≤0.020 ≤0.020 0.0...
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