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Production method of low-cost high-flatness 650 MPa-grade steel plate

A production method and flatness technology, applied in the production field of low-cost high-flatness 650MPa grade steel plate, can solve the problems of increased production cost, narrow process window, long annealing time, etc.

Active Publication Date: 2021-04-20
HANDAN IRON & STEEL GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, there are strict requirements on the heating rate, purge gas flow, and soaking temperature range of the bell annealing furnace, and the narrow process window is not conducive to the stable implementation of large-scale production
At the same time, the annealing time is longer, resulting in increased production costs

Method used

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  • Production method of low-cost high-flatness 650 MPa-grade steel plate
  • Production method of low-cost high-flatness 650 MPa-grade steel plate
  • Production method of low-cost high-flatness 650 MPa-grade steel plate

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Experimental program
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Embodiment Construction

[0017] Below by specific embodiment 1~10, the present invention is described in further detail:

[0018] The chemical composition of continuous casting slab in specific embodiment 1~10 is as shown in table 1:

[0019] Table 1 Chemical composition (wt%)

[0020]

[0021] The control range of hot rolling process parameters, hot rolling heating temperature is 1200~1260°C, finish rolling temperature is 876~904°C, coiling temperature is 680-750°C, and crown is ≤40μm. The hot rolling process parameters are shown in Table 2:

[0022] Table 2 Hot rolling process parameters

[0023]

[0024] The use of the hot rolling coiling temperature can ensure sufficient precipitation of carbides, reduce the influence of supersaturated solid solution carbon on the increase in product strength, and avoid excessive product strength after rolling; The flatness of rolled coil shape can be improved to improve the control ability of pickled coil shape.

[0025] In the process of cold rolling, a...

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Abstract

The invention relates to a production method of a low-cost high-flatness 650 MPa-grade steel plate, and belongs to the technical field of metallurgy plate production. The method comprises the procedures of hot rolling, acid rolling, degreasing and straightening; and in the straightening procedure, a withdrawal and straightening machine and a straightening machine are adopted for straightening, the withdrawal and straightening elongation rate is 0.5-0.9%, and the straightening elongation rate is 0.3-0.5%. According to the method, the common wave shape and warping problems of a rolled hard coil can be effectively avoided, and the surface flatness of a final product can meet the surface quality requirement of a continuous annealing cold-rolled plate; the actually measured unevenness of the product is less than or equal to 2mm / m; and compared with an annealed coil, the alloy cost is reduced, the annealing procedure is omitted, and the product alloy cost and the procedure cost are effectively reduced.

Description

technical field [0001] The invention relates to a production method of a 650MPa grade steel plate with low cost and high flatness, belonging to the technical field of metallurgical plate production. Background technique [0002] In order to improve the strength of steel, it is often necessary to add a large amount of alloying elements, and through the effects of solid solution strengthening, precipitation strengthening or phase transformation strengthening caused by the addition of elements, the strength of steel can be improved. The increase in the addition of alloying elements will lead to an increase in cost and reduce the market competitiveness of the product. Work hardening, as a common material strengthening method, only needs to deform the steel by a certain amount to make the lattice distortion and dislocation entanglement, so as to improve the strength of the product, with low cost, convenient operation and repeatability. It has the advantages of good stability and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/06
CPCY02P10/20
Inventor 吕超杰王风强王田惠程帅杜艳玲张银普安亮
Owner HANDAN IRON & STEEL GROUP
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