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
CN1952197AInactive Publication Date: 2007-04-25ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ANGANG STEEL CO LTD
Publication Date
2007-04-25
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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