Normalized extra-thick plate with high strength and toughness and thickness of 150mm and method for manufacturing normalized extra-thick plate

Abstract

The invention discloses a normalized extra-thick plate with high strength and toughness and the thickness of 150mm and a method for manufacturing the normalized extra-thick plate, and belongs to the field of technologies for manufacturing extra-thick plates. The method mainly includes controlling technological parameters in steps of molten steel smelting, plate slab casting, steel plate rolling, steel plate normalizing treatment, cooling and the like. The normalized extra-thick plate and the method have the advantages that reasonable composition systems and optimized 'control-rolling, normalizing and weak water cooling' technologies are designed, accordingly, the steel plate is excellent in comprehensive mechanical property and good in impact toughness at the temperatures of minus 40 DEG C and minus 60 DEG C, different positions of the steel plate in the thickness direction are low and stable in mechanical property difference, requirements of Q460-level extra-thick steel plates with the thicknesses of 150mm on the strength and the impact toughness can be completely met, and the normalized extra-thick plate and the method have excellent application prospects in the field of steel for engineering structures.

Description

technical field [0001] The invention belongs to the technical field of extra-thick plate production, in particular to a normalized high-strength toughness 150mm extra-thick plate and a production method thereof. In particular, the invention relates to a 400mm-thick continuous casting slab to produce a normalized high-strength toughness 150mm extra-thick plate and a production method thereof. Background technique [0002] In China, steel plates with a thickness between "20mm and 60mm" are generally called thick plates, and steel plates with a "thickness > 60mm" are called extra-thick plates. The use of extra thick plates is very common, mainly used in ships, boilers, pressure vessels, pressurizers, steam generators, chemical reaction synthesis towers, heavy oil high temperature and high pressure desulfurization devices, components and bridges of hydroelectric turbines, machine bases, Weapons, moulds, armor and building components, etc. Traditional high-strength and high-...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a normalized high-strength toughness 150mm extra-thick plate and its production method, through reasonable alloy composition design, strict controlled rolling and controlled cooling, normalizing + water cooling process, to solve the problem of poor low-temperature impact of extra-thick plate, Insufficient strength after normal normalizing

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