Plate and strip type roll bottom type heating furnace rolls

A roller hearth heating furnace and furnace roller technology, applied in heat treatment furnaces, lighting and heating equipment, furnaces, etc., can solve problems such as slab pits, batch quality accidents, and loss of manufacturers, and achieve the effect of protecting quality

Inactive Publication Date: 2016-01-13
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During production, the furnace rolls of the CSP heating furnace will cause depressions on the lower surface of the strip during the strip travel process. Although there will be some relief after dephosphorization and then rolling, the actual surface quality of the strip will be affected. It still has a certain influence. The state of the hearth roll is the main cause of the quality defect of the lower surface of the strip. The slab contacts the furnace roll ring at the same position for a long time, which will cause a large number of

Method used

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  • Plate and strip type roll bottom type heating furnace rolls
  • Plate and strip type roll bottom type heating furnace rolls

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example one

[0018] The ring arrangement of the furnace rolls will directly affect the slab travel trajectory. For the heating furnace, the slab tracking is particularly important. In actual production, the slab tracking must be ensured and the travel trajectory is normal, otherwise it will be biased to either side during the travel. It will cause a major accident and damage the refractory and the furnace body. On January 25, 2014, the online production plan was SS400 steel grade, slab thickness 72mm, and slab width 1500mm. Through the practice of the invention, the slab traveling state has been greatly improved, and no slab tracking accident has occurred so far.

Example Embodiment

[0019] Example two

[0020] Due to the slagging of the furnace roll, the roll body is uneven. When the hot steel billet passes through, the slagging will produce indentations on the lower surface of the slab and press into the oxide scale, etc., which seriously affects the product quality of the strip surface during rolling. The characteristic of the CSP production line is that it is impossible to extract the furnace rolls online for processing. At this time, the invention can effectively solve this problem, and significantly improve the quality of the lower surface of the strip. The production plan on February 16, 2014 is the steel grade Q345B, the slab thickness is 57mm, and the slab width is 1500mm. During the production of the day, the surface quality of the lower surface of the slab was tracked, and no abnormality was found. Compared with the previous slab, the lower surface quality was significantly improved.

Example Embodiment

[0021] Example three

[0022] On April 28, 2014, SPCC was produced online. The width of the slab was 1275mm and the thickness of the slab was 72mm. Because the produced steel is low-carbon, it is easier to cause furnace roll slagging. The two pairs of slab surface quality tracking on the same day are not seen. The abnormal surface situation has been significantly improved compared to the previous situation. It can be seen that the invention has significant effects on different steel grades and different slab specifications. After a period of verification, the use and promotion of the invention has significantly increased the service life of the two-stream heating furnace rollers, which effectively reduces the slagging of the furnace rollers, thereby reducing the accident time and the insulation material when the furnace roller is replaced. The amount of usage effectively saves production costs.

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Abstract

The invention discloses plate and strip type roll bottom type heating furnace rolls which aim at achieving the technical purposes that the quality of the lower surfaces of plate blanks is guaranteed to the maximum degree under the normal production state, the manufacturing cost is the same as the cost of an original roll model, and the problem of the quality of the lower surfaces of plates and strips can be solved effectively. The furnace rolls are four in number and arranged in parallel. A roll body of each furnace roll is provided with two roll ring sets, wherein two roll rings are arranged in each set. The distance between the two roll rings in each set on each furnace roll body is the same as the distance between the two roll rings in another set. Each roll ring set on one furnace roll is staggered relative to the roll ring set on another furnace roll.

Description

technical field [0001] The invention relates to a roller hearth heating furnace roller of plate and strip type, which is applicable to all roller hearth heating furnaces of plate and strip type, and can effectively improve the quality of the lower surface of a slab. Background technique [0002] During production, the furnace rolls of the CSP heating furnace will cause depressions on the lower surface of the strip during the strip travel process. Although there will be some relief after dephosphorization and then rolling, the actual surface quality of the strip will be affected. It still has a certain influence. The state of the hearth roll is the main cause of the quality defect of the lower surface of the strip. The slab contacts the furnace roll ring at the same position for a long time, which will cause a large number of pits on the lower surface of the slab, which cannot be bridged during rolling. , resulting in batch quality accidents, causing greater losses to manufac...

Claims

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Application Information

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IPC IPC(8): C21D9/54F27D3/02
Inventor 任东升张玮曹青松张荣
Owner INNER MONGOLIA BAOTOU STEEL UNION
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