Wide and thick superfine-grain hot-rolled plate and method for producing same

An ultra-fine grain, hot-rolled coil technology, used in metal rolling, metal rolling, rolling mill control devices, etc., to achieve the effects of easy smelting, simple chemical composition, and reasonable yield-strength ratio

Inactive Publication Date: 2007-04-25
ANGANG STEEL CO LTD
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  • Claims
  • Application Information

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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-bas

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  • Wide and thick superfine-grain hot-rolled plate and method for producing same
  • Wide and thick superfine-grain hot-rolled plate and method for producing same
  • Wide and thick superfine-grain hot-rolled plate and method for producing same

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Embodiment Construction

[0023] In order to reduce production costs and improve economic benefits, the invention adjusts and optimizes the chemical composition of common SS400, so that the strength of the steel plate is greatly improved. In order to reduce processing and welding deterioration, and at the same time properly achieve the purpose of solid solution strengthening, adjust C to 0.12-0.18%. In order to make Si play a role of solid solution strengthening and avoid deterioration of the surface properties of the steel plate, Si is adjusted to 0.12-0.25%. Mn can reduce Ar 3 The transformation point and the effect of expanding the austenite phase region are helpful for grain refinement and increased strength. At the same time, considering that it can improve the strength-ductility balance, the Mn is adjusted to 0.70-1.30%. According to the requirements of ultra-fine grain steel, the content of P and S is appropriately reduced, and the economical cleanliness of steel is achieved.

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PUM

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Abstract

The invention discloses a generous specification ultra-fine grain hot rolling plate and its production methods. Its chemical composition (by weight percentage) is: C:0.12-0.18%,Si:0.12-0.25%,Mn: 0.70-1.30%,P:<=0.02%,S:<=0.015%, and Fe as the rest and inevitable impurities, plate thickness 8~14mm. In the invention through raising appropriately the mill inlet temperature, increasing the cooling capacity of the finishing mill , allocating the deflection of each finishing mill pass, to make it process in the non-recrystallization area of the austenite; rapid cooling after rolling and reeling at a low temperature, to obtain ultra-fined ferrite and multiphase of bainite, ferrite grain size3-6 mum, the mechanical properties of yield strength up to 400Mpa, over 520Mpa tensile strength, specific elongation over 28%. The invention can save alloy sources and bring great economic and social benefits for enterprises as there are no special steel alloy elements in the steel to substitute micro-alloyed steel with the same grade.

Description

technical field [0001] The invention relates to a hot continuous rolling steel plate and a production method thereof, in particular to a hot continuous rolling coil plate with wide and thick specifications and ultrafine grains and a production method thereof. 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-sc...

Claims

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Application Information

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IPC IPC(8): C22C38/04B21B37/00C21D8/04
Inventor 孙建伦张万山郝森关菊孙群王科强刘立群陈克东
Owner ANGANG STEEL CO LTD
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