Method for Eliminating Warping Defects at Edges of Hot Continuously Rolled Strip Steel and Strip Steel Produced by the Method

A strip edge, hot continuous rolling technology, applied in the field of steelmaking, can solve problems such as inability to obtain cast slabs, improve product competitiveness and economic benefits, improve strip edge quality, increase production rate and performance Effect

Active Publication Date: 2020-12-01
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These measures focused on the steelmaking and continuous casting processes cannot obtain 100% slabs without corner crack defects. How to eliminate or reduce the impact of slab corner crack defects in subsequent production has become the best solution in remedial measures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In the present embodiment, the production method of boron-containing steel A36 is as follows:

[0036] 1) smelt boron-containing steel A36 according to conventional methods, and cast it into a slab;

[0037] 2) After the slab is naturally cooled, check the corners of the slab and find 12 corner transverse cracks, which are distributed on the upper corners on both sides of the slab.

[0038] 3) Heat the billet in a walking heating furnace and keep it warm at 1230°C for 60 minutes; after the billet comes out of the furnace, it is descaled in a descaling box, and then enters the rough rolling mill for rolling. No rough rolling descaling water is used for the first time, and the rough rolling descaling water is used for the remaining 5 passes; then it enters the finishing rolling unit for rolling, the final rolling temperature is 870°C, and the strip thickness is 6.0mm; coiling after laminar flow cooling, the coiling temperature 620°C. There is no warped skin defect on th...

Embodiment 2

[0040] In the present embodiment, the production method of boron-containing steel SS400 is as follows:

[0041] 1) Smelt boron-containing steel SS400 according to conventional methods, and pour it into a billet;

[0042] 2) After the slab was naturally cooled, check the corners of the slab, and found 15 corner transverse cracks, distributed in the upper corners on both sides of the slab, of which 3 cracks had an opening width of 5mm.

[0043] 3) Place the cast slab in a walking heating furnace and heat it at 1250°C for 60 minutes; after the slab is released from the furnace, it is descaled in a descaling box and then rolled in a rough rolling mill. The starting temperature is 1140°C and two passes before rough rolling No rough rolling descaling water is used for the first time, and the rough rolling descaling water is used for the remaining 5 passes; then it enters the finishing rolling unit for rolling, the final rolling temperature is 870°C, and the strip thickness is 12.0mm...

Embodiment 3

[0045] In the present embodiment, the production method of boron-containing steel SS400 is as follows:

[0046] 1) Smelt boron-containing steel SS400 according to conventional methods, and pour it into a billet;

[0047] 2) The cast slab is not cooled, and the quality of the corners of the cast slab is unknown. The cast slab is directly sent to a walking heating furnace for heating, and is kept at 1240°C for 60 minutes; , the starting rolling temperature is 1130°C, the rough rolling descaling water is not used in the first 2 passes of rough rolling, and the rough rolling descaling water is used in the remaining 5 passes; then it enters the finishing rolling unit for rolling, the final rolling temperature is 870°C, and the strip thickness is 8.0 mm; coiled after laminar flow cooling, coiling temperature 630 ℃. There is no warped skin defect on the edge of the hot strip.

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Abstract

The invention belongs to the technical field of steel refining, and in particular, relates to a method for eliminating edge warp defects of hot-continuous-rolled strip steel and the strip steel produced by the method. Continuous-cast blanks are put in a stepper heating furnace for heating, and are insulated by 50-80 min at 1220-1270 DEG C; the cast blanks are discharged from the furnace for descaling by adopting a descaling box, and are rolled in a rough rolling machine at a rolling temperature of 1100-1150 DEG C by 5-7 gates; rough rolling descaling water is not fed in the previous two gates,so that higher temperatures of intermediate blanks are reached, and the temperatures of the intermediate blanks in the whole rough rolling phase are located in a plastifying area; after the second gate of rough rolling, the rough rolling descaling water is totally fed in to eliminate scales on the surfaces of the intermediate blanks; then, the intermediate blanks are fed in a fine rolling unit for rolling, and the final rolling temperature is 850-930 DEG C; the winding is performed after lamellar cooling at a winding temperature of 500-750 DEG C; and the hot-continuous-rolled strip steel withno or fewer warp defects is finally produced.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for eliminating warping defects at the edge of hot continuous rolling strip steel and the strip steel produced by the method. Background technique [0002] The warping defects at the edge of hot continuous strip steel are mainly distributed between 10 and 40 mm from the edge of the strip steel, and are mainly intermittently distributed at the edge of the upper surface of the strip steel. , the elongated direction is the rolling direction of hot rolling. When the strip thickness is less than 3.0mm, it tends to be warped. As the thickness of the strip increases, the warping is not obvious, showing a cracked state. [0003] Warped skin defects at the edge of hot continuous strip steel are mainly caused by transverse cracks in billet corners, and a small amount are caused by iron oxide scale intrusion, air bubbles in billets, and mold slag mixed in. In the h...

Claims

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Application Information

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IPC IPC(8): B21B37/28B21B37/74
Inventor 王旭生赵科黄健曲鹏康海军张楠闵洪刚姜艳菲王文澜杨得草于立伟董宝权宋涛赵亮刘琳刘克云杜洪志李沈洋兰英陈宇徐勇韩宇金世铨许学利崔宏涛田玉伟苏崇涛海超左海霞王会忠肖辉张猛程宏远左远鸿张海宾胡德威由宇邹伟赵大鹏黄亮关立凯隋鹏飞张伟何群才郭晓静孟宪涛王爱华宋博
Owner BENGANG STEEL PLATES
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