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A method for producing thin-gauge dual-phase steel using thin-slab continuous casting and rolling process

A thin-slab continuous casting and thin-gauge technology, which is applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of excessive thickness, low hit rate of target finishing rolling temperature, and wear, so as to reduce production costs, Effects of stable production and improved dimensional accuracy

Active Publication Date: 2018-05-08
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of producing these thin-gauge dual-phase steels using this process, the following problems are still encountered: 1. The unreasonable distribution of the pressing of each stand causes a certain stand to reach the load limit, making the rolling process unstable; 2. Due to The continuous long-term production of strip steel causes serious wear and tear on the work rolls of each stand (especially the work rolls of the finishing mill), which makes it difficult to control the thickness accuracy and shape accuracy of the strip steel, and obvious thickness deviation and wave shape appear; 3. The temperature drop of thin-gauge steel strip is very fast, and the temperature of the strip steel fluctuates greatly, so that the hit rate of the target finishing temperature is low, which has an adverse effect on the mechanical properties of the strip steel

Method used

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  • A method for producing thin-gauge dual-phase steel using thin-slab continuous casting and rolling process
  • A method for producing thin-gauge dual-phase steel using thin-slab continuous casting and rolling process
  • A method for producing thin-gauge dual-phase steel using thin-slab continuous casting and rolling process

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Experimental program
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Effect test

Embodiment 1

[0050] This embodiment provides a method for producing thin-gauge dual-phase steel using the thin-slab continuous casting and rolling process, and its process route is as follows figure 1 As shown, firstly molten steel is continuously casted into a continuous casting slab with a width of 1300-1600mm and a thickness of 62-94mm, and then rough rolling, insulation cover heat preservation, induction heating, high-pressure water descaling and finish rolling are carried out in sequence to obtain a width of 1300-1600mm , Ultra-thin strip steel with a thickness of 1.5-1.8mm, and finally cooled by control, divided into coils, cut and coiled into coils. The main process steps and process parameters are as follows:

[0051] (1) Continuous casting

[0052] The chemical composition of molten steel is as follows: C 0.06%~0.12%, Si 0.3%~0.6%, Mn 1.5%~2%, Al 0.02%~0.04%, P≤0.015%, S≤0.012%, N≤0.008% , Ca≤0.002%, Cu≤0.15%, Sn≤0.02%, Ni≤0.2%, Cr≤0.12%, Mo≤0.05%, V≤0.02%, Nb≤0.025%, the rest i...

Embodiment 2

[0078] This embodiment provides a more detailed and optimized process scheme on the basis of Embodiment 1, which can make the longitudinal thickness accuracy, flatness accuracy and surface quality of the finished strip steel better, and obtain a cold-rolled strip equivalent to the same specification. Comprehensive mechanical properties.

[0079] The thickness of the continuous casting slab is 75-85mm, and the casting speed is 5.3-5.7m / min.

[0080] The reduction rate of the first roughing mill of the roughing unit is 40%-45%, the rolling temperature is controlled at 1110-1120°C, and the rolling pressure per unit width is 14-14.5KN / mm; the reduction rate of the second roughing mill is 38 %~43%, the rolling temperature is controlled at 1050~1060°C, the rolling pressure per unit width is 14~14.5KN / mm; the reduction rate of the third rough rolling mill is 40%~45%, and the rolling temperature is controlled at 990~1000 ℃, the rolling pressure per unit width is 17-18KN / mm.

[0081]...

Embodiment 3

[0090] In this embodiment, the production of a finished steel strip with a carbon content of 0.08%, a width of 1500 mm, and a thickness of 1.5 mm is taken as an example, and the specific process is as follows.

[0091] Continuous casting of molten steel into a continuous casting slab with a width of 1500mm and a thickness of 80mm, followed by rough rolling, heat preservation in a heat preservation cover, induction heating, high-pressure water descaling and finish rolling to obtain an ultra-thin strip steel with a width of 1500mm and a thickness of 1.5mm , and finally controlled cooling, coil cutting and winding into rolls. The main process steps and process parameters are as follows:

[0092] (1) Continuous casting

[0093] The chemical composition of molten steel is as follows: C 0.06%~0.12%, Si 0.1%~0.2%, Mn 0.3%~0.5%, Al 0.02%~0.04%, P≤0.015%, S≤0.012%, N≤0.008% , Ca≤0.002%, Cu≤0.15%, Sn≤0.02%, Ni≤0.2%, Cr≤0.12%, Mo≤0.05%, V≤0.02%, Nb≤0.025%, the rest is Fe and unavoidabl...

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Abstract

The invention relates to a method for producing thin-gauge dual-phase steel by applying a thin slab continuous casting and rolling process. The method comprises the steps: continuously casting molten steel to form a continuous casting slab with the width of 1300-1600mm and the thickness of 62-94mm; then, sequentially carrying out rough rolling, heat insulation by a heat insulation cover, induction heating, high-pressure water scale removal and finish rolling to obtain ultrathin strip steel with the width of 1300-1600mm and the thickness of 1.5-1.8mm; and finally, carrying out controlled cooling, coil-by-coil shearing and coil winding. A finished product of the thin-gauge dual-phase steel has the yield strength of 370-390MPa, the tensile strength of 590-630MPa and the elongation rate of larger than or equal to 15%. By using the method, hot-rolled thin-gauge dual-phase steel of which the size precision, slab shape precision and comprehensive mechanical property can meet requirements can be stably produced.

Description

technical field [0001] The invention relates to the technical field of hot rolling, and more specifically, relates to a method for producing thin-gauge dual-phase steel using a thin-slab continuous casting and rolling process. Background technique [0002] The technical route of the newly developed thin slab continuous casting and rolling process at home and abroad is: continuous casting - rough rolling - shearing - heat preservation - induction heating - descaling - finishing rolling - controlled cooling - shearing - coiling. Compared with the traditional thin slab continuous casting and rolling process, this process can produce thinner hot-rolled strip steel, and the product can realize "replacing cold with heat", thereby reducing energy consumption and production costs to a greater extent, so it has the advantages of Broad market prospects. [0003] At present, the thickness of dual-phase steel products produced by this process can reach 1.5-1.8mm. This thickness range i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B15/00B21B37/74B21B37/76B21B37/42B21B37/32B21B45/08C22C38/02C22C38/04C22C38/06C22C38/16C22C38/08C22C38/18C22C38/12
CPCB21B1/463B21B15/00B21B15/0007B21B37/32B21B37/42B21B37/74B21B37/76B21B45/08B21B2015/0057C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 陈全忠陈连龙吴有生
Owner WISDRI ENG & RES INC LTD
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