A Controlled Rolling Method for Eliminating Chromatic Defects on the Surface of Hot-rolled Strip Steel

A technology for controlling rolling and hot-rolled steel strips, applied in rolling mill control devices, metal rolling, metal rolling, etc. Avoid and improve the effect of descaling rate

Active Publication Date: 2016-10-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of chromatic aberration defects on the surface of hot-rolled strip steel, the invention provides a controlled rolling method for eliminating chromatic aberration defects on the surface of hot-rolled strip steel

Method used

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  • A Controlled Rolling Method for Eliminating Chromatic Defects on the Surface of Hot-rolled Strip Steel
  • A Controlled Rolling Method for Eliminating Chromatic Defects on the Surface of Hot-rolled Strip Steel
  • A Controlled Rolling Method for Eliminating Chromatic Defects on the Surface of Hot-rolled Strip Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Taking the low-carbon steel DC04 as the target steel grade, the purer molten steel is obtained through smelting, and then continuously cast into a billet through a continuous casting machine. The composition weight percentage is: C: 0.039%, Si: 0.025%, Mn: 0.23%, P: 0.017%, S: 0.0045%, Al: 0.022%, and the balance is iron.

[0041] The thickness of the cast slab is 200mm, and the cast slab is heated in a heating furnace for 180min. In the process of descaling in 1, 3 and 5 passes, the hydraulic pressure of rough rolling and descaling is 18MPa, and the temperature of rough rolling and final rolling is controlled at 1040°C;

[0042] Dephosphorize the slab entering the finishing mill once, and the dephosphorization water pressure is 18MPa, and then carry out the finish rolling with 7 stands. The starting temperature of the finish rolling stage is 1030°C. The cooling water volume between the racks is 60%, the cooling water volume between the second and third racks is 50%, t...

Embodiment 2

[0046] Taking low-carbon steel SPHC as the target steel grade, pure molten steel is obtained through smelting, and then continuously cast into billets through continuous casting machines. The composition weight percentages are: C: 0.05%, Si: 0.03%, Mn: 0.33%, P: 0.015%, S: 0.004%, Al: 0.02%, and the balance is iron.

[0047] The thickness of the cast slab is 220mm, and the cast slab is heated in a heating furnace for 200min. In the process of descaling in 1, 3 and 5 passes, the water pressure for rough rolling and descaling is 20MPa, and the temperature for rough rolling and final rolling is controlled at 1080°C;

[0048] Dephosphorize the slab entering the finishing mill once, the water pressure of the finishing mill is 20MPa, and then carry out the finish rolling of 7 stands. The cooling water volume between the second rack is 65%, the cooling water volume between the second and third racks is 55%, the cooling water volume between the third and fourth racks is 45%, and the ...

Embodiment 3

[0052] Taking alloy steel 510L as the target steel type, pure molten steel is obtained through smelting, and then cast into slabs through continuous casting machines. The composition weight percentages are: C: 0.08%, Si: 0.15%, Mn: 1.3%, P : 0.018%, S: 0.005%, Al: 0.02%, Nb: 0.024%, and the balance is iron.

[0053] The thickness of the cast slab is 240mm, and the cast slab is heated in a heating furnace for 220min. In the process of descaling in 1, 3 and 5 passes, the water pressure of rough rolling and descaling is 22MPa, and the temperature of rough rolling and final rolling is controlled at 1100°C;

[0054] Dephosphorize the slab entering the finishing mill once, and the dephosphorization water pressure of the finishing mill is 22MPa, and then carry out the finish rolling of 7 stands. The cooling water volume between the second rack is 70%, the cooling water volume between the second and third racks is 60%, the cooling water volume between the third and fourth racks is 40...

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Abstract

The invention provides a rolling controlling method for eliminating the surface chromatic aberration defect of hot-rolled strip steel in order to solve the problem of the surface chromatic aberration defect of the hot-rolled strip steel and belongs to the technical field of metallurgy. The rolling controlling method for eliminating the surface chromatic aberration defect of the hot-rolled strip steel comprises the steps that continuous casting formed slabs are placed in a heating furnace for heating processing, high-pressure water descaling is performed on the slabs after being discharged from the furnace, and one-time scale is cleaned up; 3-5 times of rough rolling is performed on the slab, and odd-number times of the descaling is adopted; then finishing rolling of the slabs entering into a finishing rolling machine is performed on a seventh rack after one-time descaling, and meanwhile hot rolling lubrication oil is injected into from the second rack to the sixth rack according to thickness and speed requirement of strip steel; the finishing rolled strip steel is rolled and taken after being cooled by the adoption of a front section type laminar cooling pattern. By the application of the rolling controlling method for eliminating the surface chromatic aberration defect of the hot-rolled strip steel, compared with traditional technology, the transverse uniformity of the scale of the hot-rolled strip steel can be remarkably improved, the scale structure is more reasonable, the surface chromatic aberration defect of the hot-rolled strip steel is effectively eliminated, and the surface quality of the hot-rolled strip steel is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, in particular to a controlled rolling method for eliminating color difference defects on the surface of hot-rolled strip steel. Background technique [0002] my country is a big country in steel production and consumption, and its steel output ranks first in the world for many years in a row. Hot-rolled coils have the largest proportion among hot-rolled products, and can be sold directly or used as raw materials for subsequent cold-rolled production. Due to the long-term lack of attention to the surface quality of hot-rolled products, it is difficult to remove the iron scale on the surface of hot-rolled strip steel. Among them, color difference defects are an important representative of the surface defects of strip steel, which not only affects the appearance of hot-rolled products, but also easily causes subsequent problems. The phenomenon of "under-pickling" and "over-pickling" in the pi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/00
CPCB21B37/00
Inventor 曹光明刘振宇李志峰王福祥何永全李成刚
Owner NORTHEASTERN UNIV LIAONING
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