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Method for preparing low-stress hot-rolling high-strength steel with steel plate thickness of 8-20 mm

A low-stress, high-strength steel technology, which is applied in the field of low-stress hot-rolled high-strength steel with a steel plate thickness of 8-20 mm, can solve the problems of limited regulation, weak residual stress control, and inconspicuous apparent shape. Achieve the effect of flat and stable steel plate shape and improve straightening effect

Active Publication Date: 2015-09-30
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that it needs special electric pulse equipment, the investment cost is high, and it is not suitable for large-scale batch production in steel mills.
The problem is that it is only suitable for thin-gauge hot-rolled products, and bell annealing is required, which complicates the process and significantly increases the cost
The problem is that it is only suitable for thin-gauge hot-rolled products, and the effect of tension is not obvious for thick-gauge products
The problem is that for thick high-strength steel, the apparent plate shape is not obvious during the cooling process, so its regulating effect is limited
The problem is that it is mainly aimed at the apparent shape of the plate, and the control effect on the residual stress is weak

Method used

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  • Method for preparing low-stress hot-rolling high-strength steel with steel plate thickness of 8-20 mm
  • Method for preparing low-stress hot-rolling high-strength steel with steel plate thickness of 8-20 mm
  • Method for preparing low-stress hot-rolling high-strength steel with steel plate thickness of 8-20 mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A prepared steel plate specification: thickness is 8mm, width is 1800mm, yield strength is 700MPa, its preparation process:

[0029] Continuous casting slab heating→rough rolling→finish rolling→cooling after rolling→coiling→air cooling to room temperature→recoiling→rough straightening→crosscutting→finish straightening→steel stacking;

[0030] in:

[0031] After the continuous casting slab is heated to 1250-1300°C, hot rolling is carried out with micro-medium waves, and the exit temperature of rough rolling is 1050-1100°C, the exit temperature of finish rolling is 860-880°C, and the middle part of the steel plate is controlled to be straight The degree value is 15IU;

[0032] The dense laminar flow cooling method is adopted, the pressure of the cooling water is 1.2bar, the ratio of the cooling water on the upper and lower surfaces of the strip is 1:1.3, and the high-pressure water jet direction of the side nozzle is 95° to the rolling direction;

[0033] Coiling at a t...

Embodiment 2

[0038] A prepared steel plate specification: the thickness is 10mm, the width is 1750mm, the yield strength is 650MPa, and its preparation process:

[0039] Continuous casting slab heating→rough rolling→finish rolling→cooling after rolling→coiling→air cooling to room temperature→recoiling→rough straightening→crosscutting→finish straightening→steel stacking;

[0040] in:

[0041]After the continuous casting slab is heated to 1250-1300°C, hot rolling is carried out with micro-medium waves, and the exit temperature of rough rolling is 1080-1120°C, the exit temperature of finish rolling is 880-900°C, and the middle part of the steel plate is controlled to be straight The degree value is 10IU;

[0042] The dense laminar flow cooling method is adopted, the pressure of the cooling water is 1.2bar, the ratio of the cooling water on the upper and lower surfaces of the strip is 1:1.2, and the high-pressure water jet direction of the side nozzle is 96° to the rolling direction;

[0043...

Embodiment 3

[0048] A prepared steel plate specification: thickness 12mm, width 1700mm, yield strength 600MPa, its preparation process:

[0049] Continuous casting slab heating→rough rolling→finish rolling→cooling after rolling→coiling→air cooling to room temperature→recoiling→rough straightening→crosscutting→finish straightening→steel stacking;

[0050] in:

[0051] After the continuous casting slab is heated to 1250-1300°C, hot rolling is carried out with micro-medium waves, and the exit temperature of rough rolling is 1080-1120°C, the exit temperature of finish rolling is 880-900°C, and the middle part of the steel plate is controlled to be straight The degree value is 20IU;

[0052] The dense laminar flow cooling method is adopted, the pressure of the cooling water is 1.2bar, the cooling water ratio of the upper and lower surfaces of the strip is 1:1.4, and the high-pressure water jet direction of the side nozzle is 96° to the rolling direction;

[0053] A 7-roller straightening mach...

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Abstract

A method for preparing low-stress hot-rolling high-strength steel with the steel plate thickness of 8-20 mm comprises the steps as follows: heating continuous casting slabs, carrying out rough rolling, carrying out finish rolling, cooling after rolling, reeling, air-cooling to the room temperature, uncoiling again, rectifying roughly, cutting transversely, rectifying finely and stacking steel plates. In the hot rolling process, a slight center wave rolling method is adopted; the steel plates are cooled by adopting an encryption type laminar cooling way; during rough rectifying, the warping value of the two ends of the steel plates is 100-300 mm; during fine rectifying, the warping value of two ends of the steel plates is 0-2 mm; the value range of the overload ratio is 3-10; and the plastic deformation proportion in the thickness direction of the steel plates is controlled to be not lower than 80%. According to the method, on the premise that the mechanical property of the steel plates is guaranteed, the absolute value of the difference between residual stresses of any two points of the steel plates in a transverse direction is no more than 75 MPa; and the steel plates are flat, straight and stable in shape, and requirements of higher-end users can be completely met.

Description

technical field [0001] The invention relates to a production method of high-strength steel, in particular to a production method of low-stress thick-gauge high-strength steel, and is especially suitable for a production method with reduced yield strength greater than 500MPa, thickness of 8.0-20mm, and low internal stress. Background technique [0002] The shape of hot-rolled strip is a quality index that users require more and more. The quality of its plate shape will affect the processing efficiency of strip steel flattening, strip cutting and subsequent welding process and the final product quality, especially high-strength engineering machinery steel, ship plate, boiler container steel and automobile girder plate, etc. High-strength thick-gauge hot-rolled products that require subsequent processing impose strict requirements on the shape of the product. The residual stress existing inside the steel plate has a very close relationship with the shape of the plate. The exi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02
Inventor 汪水泽韩斌宋平陈丽娟王珩皞周银波魏兵刘洋梁文
Owner 武汉钢铁有限公司