Method for manufacturing of low-cost super-thick steel plate by short process

Abstract

The invention provides a method for manufacturing of a low-cost super-thick steel plate by a short process. The method includes: conducting smelting, continuous casting, and cutting, then performing stacking slow cooling for 20-30h, cleaning the surfaces and lateral sides of blanks, and maintaining the roughness at 6.3 micrometers; subjecting the two blanks to involution, then performing vacuum pumping and welding to maintain the thickness of the combined blank at 200-300mm; sending the combined blank into a walking beam type heating furnace, conducting preheating at a slow heating speed, controlling cold charging at 12-13min/cm, employing a normal speed at a heating section, prolonging the heat preservation time of a soaking section by 0-30min, and keeping the tapping temperature higher than or equal to 1100DEG C; after phosphorus removal, employing direct rolling or TMCP rolling, controlling the initial rolling temperature of rough rolling higher than or equal to 1050DEG C, keeping a first pass reduction rate higher than or equal to 10% and a cumulative reduction rate higher than or equal to 30%; and controlling the initial rolling temperature and the final rolling temperature of finish rolling at technological parameter lower limits, controlling a compression ratio at 1.8-2.5, and carrying out air cooling or controlled cooling after rolling as well as a heat treatment. The super-thick steel plate product produced at a small compression ratio has good quality and uniform performance. And the method provided in the invention has low energy consumption and fast rolling pace, is suitable for industrial mass production, and has significant economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a production method of an extra-thick steel plate with a thickness of 80-150 mm, in particular a production method using a short process and low energy consumption. Background technique [0002] As a high-end and high-value-added steel product, extra-thick steel plate has been the focus of research by personnel engaged in the metallurgical industry and the hot pursuit of metallurgical enterprises for many years due to its wide application fields and difficult production technology. In our country, the research on extra-thick plates started relatively late, especially for steel plates with a finished thickness of more than 80mm. Due to the rapid development of various industries in my country, such as large-scale machinery and structure manufacturing, military industry, shipbuilding, boiler containers, deep-sea oil development equipment, nuclear power and other fields, the demand...

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Problems solved by technology

[0007] "Vacuum Electron Beam Welding Method" patent (publication number CN 101590596A) adopts vacuum seal welding of two continuous casting slabs with a thickness of 300mm to produce a...

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