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Rolling method of high-surface-quality marine steel plate

A marine steel plate, high surface technology, applied in the direction of metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problems of medium and thick plate iron oxide scale retention and no related reports, so as to increase investment and production costs, change Surface quality, easy-to-remove effect

Inactive Publication Date: 2021-02-12
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patents CN 101660091A, CN 101012528A, and CN 101856669A are mainly aimed at short-process continuous casting and rolling production lines for medium and thin plates, and mainly solve the problem of rolled steel plates, but there are no related reports on how to control and retain the oxide scale of medium and thick plates

Method used

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  • Rolling method of high-surface-quality marine steel plate
  • Rolling method of high-surface-quality marine steel plate
  • Rolling method of high-surface-quality marine steel plate

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0020] The steels of Example 1 and Comparative Example 1 are both high-strength ship plate AH36, and the chemical composition of the steel is the same, in terms of weight percentage: 0.15%C, 0.24%Si, 1.18%Mn, 0.016%Nb, 0.012%Ti, 0.025% Al, the balance is Fe and unavoidable impurity elements; all use 260mm×2080mm continuous casting slabs to roll 25mm×3000mm thick plates, and the specific rolling is carried out on a 5-meter wide and thick plate rolling line. The main production equipment includes Walking beam heating furnace; high-pressure water descaling box, the system pressure is 250bar; four-high reversing roughing mill with vertical rolls, the diameter of the vertical roll work roll is 900~1000mm, and the diameter of the horizontal roll work roll is 1110~1210mm; Four-high reversing finishing mill with roll bending and shifting; and accelerated cooling system.

[0021] Example 1

[0022] Heat the cast slab to 1200°C, and perform high-pressure water descaling treatment in th...

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Abstract

The invention discloses a rolling method of a high-surface-quality marine steel plate. The rolling method is mainly characterized in that for a wide and thick plate rolling mill production line, by controlling parameters such as heating, descaling, temperature and water cooling in the rolling process, secondary and tertiary oxide scales generated in the rolling process are reserved, so that a layer of uniform and compact oxide film is generated on the surface of the steel plate, and the steel plate is prevented from rusting; and after pretreatment shot blasting, the rust removal quality gradeof the surface of the steel plate can reach the Sa3 level. According to the rolling method of the high-surface-quality marine steel plate, existing equipment does not need to be modified, and the surface quality of the steel plate is improved through process optimization on the basis that investment and production cost are not increased.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a rolling method of high-surface-quality marine steel plates. [0002] technical background [0003] During the heating, conveying and rolling process of the continuous casting slab, due to contact with oxygen and water, a certain amount of iron oxide scale will inevitably be produced on the surface of the slab. If it is not handled properly, it will greatly affect the surface quality of the rolled steel plate, especially for ships. In the process of use, pretreatment and sandblasting are required. If there are defects such as iron scale pressing, steel plate corrosion pits and pitting, it will seriously affect the appearance and quality of the product. [0004] For the continuous casting slab used to produce medium and thick plates, due to the long time in the furnace, the furnace-grown oxide scale is thicker and has higher growth stress. The bonding force between the primary oxi...

Claims

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Application Information

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IPC IPC(8): B21B1/38B21B15/00B21B37/74B21B45/08
CPCB21B1/38B21B15/00B21B37/74B21B45/08
Inventor 于青郑健郑生斌罗登张勇伟姚建华
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD