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Straightening method for improving plate shape of thin controlled-cooling steel plate

A technology of steel plate shape and thin gauge, which is applied in the field of improving the straightening of thin-gauge cooling-controlled steel plates. It can solve the problems of impact equipment, drilling into the gap between the rollers, and re-deformation of the steel plate, so as to improve user experience and shorten the process. Cycle time and cost, the effect of improving physical quality

Inactive Publication Date: 2019-04-02
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, some high-strength and low-alloy steel plates in medium and heavy plate products need to be produced by TMCP technology. Due to the particularity of the production of medium and heavy plate products, some thin gauge controlled cooling steel plates have internal stress inside the steel plate after controlled cooling, and the steel plate before straightening The final internal stress has a release process, and the release of profit will directly lead to the re-deformation of the steel plate in the subsequent slow cooling process, especially in the head and tail areas of the steel plate. This deformation will have a significant impact on the production process, such as steel plate The buckle will cause the risk of drilling into the gap of the roller table, and the steel plate will not be cut normally if the head is tilted, and there is also a risk of hitting the equipment, and it will directly affect the online flaw detection effect. very important

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The production pipeline steel grade is L485M, and the specification is 12.5mm*2495mm*25600mm. The straightening method specifically includes the following steps:

[0018] 1) The number of straightening passes for thin-gauge controlled-cooling steel plates is 3 times, and the interval between passes is 10s;

[0019] 2) The set value of the roll gap at the entrance of the straightening machine is 12.5-3.0 = 9.5mm, and the set value of the roll gap at the exit is 12.5-0.2 = 12.3mm;

[0020] 3) The setting value of the lead-out roller of the straightening machine is +1.8mm;

[0021] 4) The setting value of the tilting of the entrance roller and the exit roller is 12.3-9.5=2.8mm;

[0022] 5) The straightening speed is set to 0.6m / s;

[0023] Before the method of embodiment 1 is implemented, the head and tail warping of the plate is transferred to the cold straightening process to reach 83%; after the implementation, the direct storage rate reaches 82%, that is, the cold st...

Embodiment 2

[0025] The production of bridge steel grade Q370qE, the specification is 12mm*2888mm*32600mm, the straightening method specifically includes the following steps:

[0026] 1) The number of straightening passes for thin-gauge controlled-cooling steel plates is 3 times, and the interval between passes is 8s;

[0027] 2) The set value of the roll gap at the entrance of the straightener is 12-3.2=8.8mm, and the set value of the roll gap at the exit is 12-0.1=11.9mm;

[0028] 3) The setting value of the lead-out roller of the straightening machine is +1.6mm;

[0029] 4) The setting value of the tilting of the entrance roller and the exit roller is 11.9-8.8=3.1mm;

[0030] 5) The straightening speed is set to 0.7m / s;

[0031] The method of embodiment 2 is implemented before the plate shape head and tail warping is transferred to the cold straightening process to reach 65%; after the implementation, the direct storage rate reaches 94%, that is, the cold straightening process is 6%, ...

Embodiment 3

[0033] The steel grade for production engineering is Q460C, and the specification is 10mm*2688mm*37600mm. The straightening method specifically includes the following steps:

[0034] 1) The number of straightening passes for thin-gauge controlled-cooling steel plates is 3 times, and the interval between passes is 10s;

[0035] 2) The set value of the roll gap at the entrance of the straightening machine is 10-3.5=6.5mm, and the set value of the roll gap at the exit is 10-0.1=9.9mm;

[0036] 3) The setting value of the lead-out roller of the straightening machine is +1.6mm;

[0037] 4) The setting value of the tilting of the entrance roller and the exit roller is 9.9-6.5=3.4mm;

[0038] 5) The straightening speed is set to 0.8m / s;

[0039] The method of embodiment 3 is implemented before the plate shape head and tail warping is transferred to the cold straightening process to reach 34%; after the implementation, the direct storage rate reaches 98%, that is to say, the cold st...

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Abstract

The invention relates to a straightening method for improving the plate shape of a thin controlled-cooling steel plate, a hot straightening method is adopted, and the plate shape of the head part andthe tail part of a steel plate are controlled through a straightener. Adjusted straightening technological parameters comprise straightening pass, pass interval time, a straightener inlet roller gap set value, an outlet roller gap set value, a straightener leading-out roller set value, inlet roller and outlet roller tilting set values and a straightening speed. The method effectively improves theplate shape of the head part and the tail part of an 8-15mm thin controlled-cooling steel plate, so that the quality of the steel plate in kind is improved, the working process is shortened, the costis saved, and finally the user experience is improved.

Description

technical field [0001] The invention relates to a hot-rolled strip technology, in particular to a straightening method for improving the shape of a thin-gauge cold-controlled steel plate. Background technique [0002] At present, some high-strength and low-alloy steel plates in medium and heavy plate products need to be produced by TMCP technology. Due to the particularity of the production of medium and heavy plate products, some thin gauge controlled cooling steel plates have internal stress inside the steel plate after controlled cooling, and the steel plate before straightening The final internal stress has a release process, and the release of profit will directly lead to the re-deformation of the steel plate in the subsequent slow cooling process, especially in the head and tail areas of the steel plate. This deformation will have a significant impact on the production process, such as steel plate The buckle will cause the risk of drilling into the gap of the roller ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D1/02
Inventor 罗军潘凯华王若钢李新玲于金洲周强张坤应传涛韩旭段江涛
Owner ANGANG STEEL CO LTD
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