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Manufacturing method of high-surface-quality extra-thick plate

A manufacturing method and a technology of extra-thick plates, which are applied in the field of steel rolling production, can solve problems such as difficult to meet the size requirements, achieve uniform performance, improve surface quality, and prevent corrosion

Pending Publication Date: 2021-08-20
MINMETALS YINGKOU MEDIUM PLATE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, due to the improvement of the dimensional accuracy of the medium-thick plate and the pressure of cost reduction, the thickness of the steel plate is generally controlled by the deviation. Once the surface defect of the steel plate appears, the size is difficult to meet the requirements after grinding

Method used

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  • Manufacturing method of high-surface-quality extra-thick plate
  • Manufacturing method of high-surface-quality extra-thick plate
  • Manufacturing method of high-surface-quality extra-thick plate

Examples

Experimental program
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Effect test

Embodiment

[0032] In this embodiment, 250mm / 350mm*2000mm*2400-4800mm Q345R and Q345qE billets are selected, and the rolling of steel plates with a thickness specification ≥ 50 mm is completed in a 5000mm wide and thick plate double-stand rolling mill production line. The specific rolling process control is as follows:

[0033] Select a representative component system that is prone to watermarks for rolling, and the components are shown in Table 1:

[0034]

[0035] The billet heating process is used to produce low-alloy steels with different composition systems. The process execution is shown in Table 2:

[0036]

[0037] The actual value of the descaling pressure during the descaling process is between 20.5-21.5MPa.

[0038] Process control: the thickness of the rolled steel plate is 50-120mm, the rough rolling temperature is 980-1020°C, the rough rolling is descaled 3-4 times, the thickness of the intermediate billet after the rough rolling is ≥1.5, it is rolled after being warme...

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Abstract

The invention discloses a manufacturing method of a high-surface-quality extra-thick plate. The method comprises a blank heating step, a rough rolling step, a finish rolling step and a cooling step, and the method is characterized in that in the blank heating step, the temperature of a soaking zone is 1180-1260 DEG C, the descaling is greater than or equal to one time, and the descaling pressure is greater than or equal to 20MPa; a blank is cooled to 980-1020 DEG C after being descaled, and rolling is carried out; in the rough rolling step, descaling is carried out for greater than or equal to 2 times in the rough rolling process, and the descaling pressure is greater than or equal 20MPa; the time from rough rolling to finish rolling is less than or equal to 8 min; in the finish rolling step, the initial rolling temperature is less than or equal to 950 DEG C, the finish rolling temperature is 760-920 DEG C, descaling is carried out for greater than or equal to 2 times in the finish rolling process, and the descaling pressure is greater than or equal to 20 MPa; in the cooling step, cooling is conducted immediately after rolling, the steel polishing speed is greater than or equal to 5 m / s, and the temperature of the cooled steel plate is less than or equal to 700 DEG C; and the stacking temperature is 400-570 DEG C. According to the method, the surface quality of the extra-thick plate with the thickness specification greater than or equal to 50 mm can be improved, the surface of the steel plate is free of watermarks or piebaldness, and the surface quality is good; and meanwhile, the temperature after rough rolling can be effectively reduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling production, and relates to an extra-thick plate with high surface quality and a manufacturing method thereof, in particular to a method for improving and controlling the surface quality of a steel plate with a thickness specification ≥ 50 mm under the rolling mode of a double-stand rolling mill for a 5000 mm wide and thick plate. Background technique [0002] With the development of large-scale, modern and intelligent equipment in domestic iron and steel enterprises, the problem of poor mechanical properties of thick-gauge steel plates has been basically improved, but surface defects of steel plates, such as water marks or mottled defects after shot blasting, have gradually emerged. The poor surface quality of the steel plate has a great impact on the subsequent painting process. Since such defects need to be found after shot blasting, the light can only be illuminated obliquely on the surfa...

Claims

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Application Information

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IPC IPC(8): B21B45/00B21B45/06B21B45/02B21B1/22
CPCB21B45/004B21B45/06B21B45/0203B21B45/0218B21B1/22
Inventor 李伟杨福新宋欣于涛毕建伟马鑫杨志强李新宇邴纯曹宝杰杨清山冯仰峰
Owner MINMETALS YINGKOU MEDIUM PLATE
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