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Method for reducing same plate difference of rolling temperature of ultra-long TMCP plate

A rolling temperature and ultra-long technology, applied in the field of iron and steel metallurgy, can solve the problems of difficult performance uniformity control, large temperature difference between the head, middle and tail of the steel plate, and low rolling production efficiency, so as to achieve uniform structure and high production efficiency , The effect of process cost reduction

Pending Publication Date: 2021-01-29
SHAGANG GROUP +1
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Problems solved by technology

[0005] Technical problem to be solved: This application mainly proposes a method to reduce the difference in rolling temperature between super-long TMCP plates and the same plate, so as to solve the large temperature difference between the head, middle and tail of the steel plate, low rolling production efficiency, and performance uniformity in the prior art. Technical problems such as difficult control
The purpose of the present invention is to solve the problems of long rolling time and difficult temperature control in the existing manufacturing method of super-long TMCP plates, and develops a method for reducing the difference between the rolling temperature of super-long TMCP plates and the same plate, which is helpful for reducing production costs , Improving rolling production efficiency, improving pass rate and controlling performance uniformity play an important role

Method used

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  • Method for reducing same plate difference of rolling temperature of ultra-long TMCP plate
  • Method for reducing same plate difference of rolling temperature of ultra-long TMCP plate
  • Method for reducing same plate difference of rolling temperature of ultra-long TMCP plate

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Embodiment

[0028] A method for reducing the difference between the rolling temperature of the super-long TMCP plate and the same plate. The process route of the method for reducing the difference between the rolling temperature of the super-long TMCP plate is: hot metal KR pre-desulfurization, converter smelting, LF refining, soft stirring, plate Continuous casting of slabs, reheating of slabs, rough rolling, cooling of intermediate slabs, finishing rolling, water cooling of steel plates, thermal straightening of steel plates, cooling of off-line stacks, cooling of stacks to 80°C on cooling beds, ultrasonic flaw detection of steel plates, shearing Cut and store.

[0029] The control parameters of the mother plate rolling process are shown in Table 1.

[0030] The final rolling and final cooling temperatures are shown in Table 2.

example 1

[0031] Example 1, the finish rolling pass is 7 passes, the thickness to be warmed is 40mm, and the temperature change curve of the finish rolling process is as follows figure 1 .

example 2

[0032] Example 2, the finish rolling pass is 5 passes, the thickness to be warmed is 35mm, and the temperature change curve of the finish rolling process is as follows figure 2 .

[0033] Table 1: Process Control Parameters of Mother Plate Rolling Process

[0034]

[0035] Table 2: Example final rolling and final cooling temperature

[0036]

[0037]

[0038] combine figure 1 with figure 2 Comparative analysis shows that the temperature drop of the three slabs in Example 2 is slow during the rolling process, the temperature difference between the head and the tail is small, and the temperature distribution is more uniform. From Table 2, the final rolling temperatures are 784, 780 and 784 ° C, respectively. Through the above comparative analysis, it can be seen that reducing the thickness of the intermediate billet to be heated and reducing the number of finishing rolling passes can not only reduce the rolling time, but also effectively reduce the difference in te...

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Abstract

The invention discloses a method for reducing the same plate difference of the rolling temperature of an ultra-long TMCP plate. The process route comprises the steps of molten iron KR pre-desulfurization, converter smelting, LF refining, soft stirring, plate blank continuous casting, plate blank reheating, rough rolling, intermediate blank temperature cooling, finish rolling, steel plate water cooling, steel plate hot straightening, offline stack cooling and discharging for cooling on a cooling bed to 80 DEG C, steel plate ultrasonic flaw detection, shot blasting, normalizing, steel plate accelerated cooling, shearing and warehousing.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for reducing the rolling temperature difference between super-long TMCP plates and the same plate. Background technique [0002] Among steel products, steel plates are an important variety of steel products. As an important part of high-end plate products, medium and heavy plates are widely used in construction engineering, machinery manufacturing, container manufacturing, shipbuilding, bridges, etc. Since the 1980s, the main process used in the rolling process of medium and heavy plates is TMCP. [0003] TMCP (Thermo Mechanical Control Process) process, that is, in the hot rolling process, on the basis of controlling the heating temperature, rolling temperature and rolling reduction, and then implementing air cooling or controlled cooling and accelerated cooling technology. A controlled process technology to improve the strength, toughness...

Claims

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Application Information

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IPC IPC(8): C21D8/02
CPCC21D8/0226C21D8/0242
Inventor 丁旭艳林涛铸聂文金李冉郭志龙
Owner SHAGANG GROUP
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