Method for producing wide and thick superfine-grain hot-rolled plate

Abstract

The invention discloses a method for producing hot-rolled coils with wide and thick specifications and ultrafine grains. : ≤0.02%, S: ≤0.015%, the balance is Fe and unavoidable impurities, and the thickness of the coil is 8-14mm. The present invention appropriately increases the finishing rolling inlet temperature, increases the cooling capacity of the finishing rolling stand, and reasonably allocates the finishing rolling mill The amount of deformation in each pass of the frame is carried out in the non-recrystallized area of ​​austenite; rapid cooling after rolling and coiling at a lower temperature can obtain ultra-fine ferrite and bainite multi-phase structure, iron The grain size of the element body is 3-6μm, and its mechanical properties are that the yield strength reaches more than 400Mpa, the tensile strength exceeds 520Mpa, and the elongation is greater than 28%. The steel does not contain special alloying elements, which can replace the low alloy steel of the same level, save alloy resources, and bring huge economic and social benefits to enterprises.

Description

technical field [0001] The invention relates to a hot continuous rolling steel plate and a production method thereof, in particular to a production method of a wide and thick ultrafine grain hot continuous rolling coil. Background technique [0002] At present, iron and steel materials are still the main body of engineering structural materials. However, with the rapid development of modern industry, the iron and steel industry is under increasing pressure to save resources, save energy, and protect the environment. Materials are required to be economical, environmentally friendly, and have superior performance. Higher requirements are put forward for the strength, service life and reliability of steel materials to meet the needs of light-weight energy-saving vehicles, long-span load-bearing bridges, high-rise buildings, large-scale construction machinery, deep well oil production pipes and Large-diameter oil (gas) pipelines, large-scale high-performance ships, etc. The ul...

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Problems solved by technology

Now, researchers from the Rolling Technology and Continuous Rolling Automation Laboratory of Northeastern University and Baoshan Iron and Steel Group Corporation, Anshan Iron and Steel Group Corporation, Panzhihua Iron and Steel Group Corporation, and the General Iron and Steel Research Institute have formed a Q235 common carbon steel Composition-based, the production technology of hot-rolled steel sheets with ultra-fine grains that doubles the strength of thinner specifications (≤8mm), and hot-rolled coils with ultra-fine grains with wide and thick specifications (≥8mm), due to There are considerable difficulties in the limitation of the rolling capacity and coiling capacity of the rolling mill

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