Method for controlling shape of X80 pipeline steel hot rolling middle plate

A pipeline steel and plate shape technology, which is applied in the field of pipeline steel rolling, can solve the problems affecting the production rhythm and efficiency, the flatness of the steel plate exceeds the standard, and the failure to deliver, so as to prolong the service life of the equipment, improve the shape of the steel plate, and improve the quality of the steel plate. The effect of production efficiency

Active Publication Date: 2009-04-22
SHAGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the application of the above-mentioned technology, in the production process of pipeline steel, the phenomenon of buckling and deformation of the steel plate after rolling and cooling often occurs, which in turn causes: 1. The flatness of the steel plate exceeds the standard and cannot be delivered; 2. Seriously affects The production rhythm and efficiency will increase the production cost; 3. The curved steel plate will cause great damage to the output roller table, cooling bed, conveyor chain, cutting blade, pinch roller, sprayer and typewriter during the conveying process. , which seriously affects the service life of the equipment
In particular, it should be pointed out that the curvature of the plate shape also indicates that the internal residual stress distribution is uneven, which will directly affect the performance of the steel plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment relates to the production of X80 grade pipeline steel plates with a thickness of 19.5 mm. The size of the continuous casting slab used is 2202420×3686mm, and the size of the finished plate after rolling is 19.5×3885×25520mm.

[0027]In the process of heating the slab, the temperature of the heating furnace is within the process control range, the secondary heating is controlled between 1190-1210°C, the soaking section is controlled between 1180-1200°C, and the upper limit of the soaking is conducive to rough descaling , because No. 1 heating furnace is 18.5 meters farther from the rolling mill than No. 2 heating furnace, so the temperature of No. The slab out of the furnace does not appear arched, and it is easy to turn steel, which is beneficial to the control of rolling temperature. The casting time in the furnace is 330-380min.

[0028] In the rolling process, the body length of the working rolls used is 5050mm, and the length of the back-up rolls is...

Embodiment 2

[0038] This embodiment relates to the production of X80 grade pipeline steel plates with a thickness of 22.41mm. The size of the billet used is 220×2420×4210mm, and the size of the rolled steel plate is 22.41×3875×25280mm.

[0039] And used back-up roll and production cycle are all identical with embodiment 1.

[0040] The billet heating process is the same as in Example 1.

[0041] The roll diameter of the upper and lower work rolls is <1180mm, and the crown of the upper and lower work rolls is 0.1mm. In order to ensure the crown of the rolls, the roll bending force is selected to be 500t.

[0042] The rolling temperature of the rolling mill is controlled within the range shown in the table below:

[0043] temperature Rolling temperature Second rolling temperature Finishing temperature final cooling temperature process temperature 1035～1055℃ 888～924℃ 762～806℃ 485～549℃

[0044] The rolling passes used and the reduction rate of each pass are sho...

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Abstract

The invention relates to a method for controlling a plate shape of an X80 pipeline steel hot-rolled medium plate, which comprises a heating process, a roll crown matching process, a reduction schedule selecting process, a cooling control process and a straightening process. In the heating process, secondary heating temperature and soaking zone temperature are controlled; in the roll crown matching process, a working roll has a sinusoidal structure; the diameter of an upper roll is larger than that of a lower roll; period of a grinding roller and the crown of the working roll are determined by rolling capacity and plate width; in the reduction schedule selecting process, rolling pass and reduction ratio of each pass are distributed according to the thickness of a plate material during the process of precision rolling; in the cooling control process, water volume and pressure forming four cooling zones of a cooling bed, sheltering range of a controlled cooling edge part, proportion of upper surface cooling water and lower surface cooling water of a steel plate, distance from the steel plate surface are adjusted; and in the straightening process, positions of a guide-in roll and a delivery roll are reduced by positive and negative bowed roll straightening process. The method can greatly reduce the buckling rate of a high steel grade steel plate, improve the plate shape, improve production efficiency, and prolong service life of equipment.

Description

technical field [0001] The invention relates to a method for controlling the shape of a hot-rolled pipeline steel plate in the technical field of pipeline steel rolling, in particular to a method for controlling the shape of a hot-rolled X80 pipeline steel plate. Background technique [0002] At present, energy materials such as oil and natural gas are mainly transported through pipelines. Due to the long transmission distance, the transmission pressure must be increased to increase the transmission flow rate, and the geographical environment through which the transmission pipeline passes is complex, so the pipeline steel constituting the transmission pipeline must have great strength and toughness. From the 1950s to the beginning of this century, the pressure involved in the transmission pipeline has gradually increased from 6.3MPa to more than 20MPa, and with the continuous increase in the transmission pressure of the gas pipeline, the transmission steel pipe has also rapi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/28B21B37/30B21B29/00B21B37/58B21B37/44
Inventor 钱洪建何文斌杨怀永赖家福马毅
Owner SHAGANG GROUP
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