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Method for producing ultrathin low-carbon steel by use of thin slab casting and rolling process

A thin slab continuous casting, low carbon steel technology, applied in the direction of rolls, metal rolling, manufacturing tools, etc., can solve the problems of wear, excessive thickness, low target finishing temperature hit rate, etc., to improve dimensional accuracy, reduce Production cost, effect of stable production

Active Publication Date: 2017-04-26
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the following problems are still encountered in the process of producing these thin-gauge low-carbon steels by using this process: 1. The unreasonable distribution of the pressing of each frame causes a certain frame 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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  • Method for producing ultrathin low-carbon steel by use of thin slab casting and rolling process
  • Method for producing ultrathin low-carbon steel by use of thin slab casting and rolling process
  • Method for producing ultrathin low-carbon steel by use of thin slab casting and rolling process

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Embodiment 1

[0050] This embodiment provides a method for producing ultra-thin low-carbon steel using thin slab continuous casting and rolling technology, 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 60-100mm, 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 0.8 ~ 1mm, 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 the molten steel is: C 0.05%-0.1%, Si 0.01%-0.04%, Mn 0.08%-0.2%, Al 0.02%-0.04%, P≤0.015%, S≤0.01%, N ≤0.006%, Ca≤0.0012%, Cu≤0.15%, Sn≤0.02%, Ni≤0.2%, Cr≤0.12%, Mo≤0.05%, V≤0.01%, the rest is Fe and unavo...

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 75-85 mm, and the casting speed is 5.8-6.2 m / min.

[0080] The reduction ratio of the first rough rolling mill of the rough rolling unit is 48% to 52%, the rolling temperature is controlled at 1140 to 1160°C, and the rolling pressure per unit width is 14.1 to 16KN / mm; the reduction ratio of the second rough rolling mill is 50%-55%, the rolling temperature is controlled at 1075-1095°C, the rolling pressure per unit width is 15-16.5KN / mm; the reduction rate of the third roughing mill is 45%-50%, and the rolling temperature is controlled at 1010- 1030°C, the rolling pressure per unit width ...

Embodiment 3

[0090] In this embodiment, the production of a finished steel strip with a carbon content of 0.06%, a width of 1600 mm, and a thickness of 0.8 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 1600mm 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 1600mm and a thickness of 0.8mm , 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 the molten steel is: C 0.06%, Si 0.01%-0.04%, Mn 0.08%-0.2%, Al 0.02%-0.04%, P≤0.015%, S≤0.01%, N≤0.006%, Ca≤0.0012%, Cu≤0.15%, Sn≤0.02%, Ni≤0.2%, Cr≤0.12%, Mo≤0.05%, V≤0.01%, and the rest are Fe and unavoidable trace elements....

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Abstract

The invention relates to a method for producing ultrathin low-carbon steel by use of a thin slab casting and rolling process. The method comprises the following steps: continuously casting molten steel into a continuous cast billet with the width of 1,300-1,600 mm and the thickness of 60-100 mm; then sequentially conducting rough rolling, heat preservation by a heat holding cover, induction heating, high-pressure water phosphorus removal and finish rolling to obtain ultrathin strip steel with the width of 1,300-1,600 mm and the thickness of 0.8-1 mm; and finally, performing controlled cooling, roll-dividing cutting and roll take-up. A produced ultrathin low-carbon steel end product has the yield strength of 250-310 MPa, the tensile strength of 350-400 MPa and the ductility of larger than or equal to 35%. By adoption of the method, stable production of hot-rolled ultrathin low-carbon steel with the thickness of 0.8-1 mm can be realized, the dimensional accuracy, the flatness accuracy and the comprehensive mechanical property can be improved, the demand for 'replacement of cold product by hot product' is met and the production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of hot rolling, and more specifically relates to a method for producing ultra-thin low-carbon 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 low-carbon steel products produced by this process can reach 0.8 ~ 1mm. This thickness range is...

Claims

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Application Information

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IPC IPC(8): B21B1/46B21B1/26B21B45/08B21B45/00B21B37/74B21B45/02B21B37/58B21B37/62B21B37/16B21B37/22B21B15/00B21B27/10C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46
CPCB21B1/26B21B1/463B21B15/0007B21B37/16B21B37/22B21B37/58B21B37/62B21B37/74B21B45/004B21B45/0203B21B45/08B21B2027/103C22C38/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46
Inventor 陈全忠陈连龙吴有生
Owner WISDRI ENG & RES INC LTD
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