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Production method for improving strip steel through coil mechanical property uniformity

A production method and uniformity technology, which are applied in the production field of improving the uniformity of mechanical properties of strip steel through coils, can solve the problems of dimensional fluctuations, easy fractures, and user influences of cold-rolled products, so as to improve the coiling temperature and enhance the movement ability. , the effect of uniform performance

Active Publication Date: 2013-01-02
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, because the properties of hot-rolled steel coils are hereditary to the properties of cold-rolled steel coils, it will eventually lead to dimensional fluctuations and differences in mechanical properties of subsequent cold-rolled products. For the yield strength curve, please refer to the attached figure 1
The disadvantage of the strip steel produced under this process condition is that due to the uneven performance of the product, it is easy to break during the subsequent deep processing such as drawing and stamping, which will have a great impact on the use of users and directly affect User's Economic Benefit

Method used

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  • Production method for improving strip steel through coil mechanical property uniformity
  • Production method for improving strip steel through coil mechanical property uniformity
  • Production method for improving strip steel through coil mechanical property uniformity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The chemical composition of the slab is: C: 0.032wt%, Si: 0.02wt%, Mn: 0.26wt%, P: 0.008wt%, S: 0.008wt%, Alt: 0.041wt%, N: 0.003wt%, the rest Basically Fe and other trace elements.

[0027] Reheat the head of the slab to 1250°C, the tail to 1270°C, the heating time is 3.2 hours, the final rolling temperature is 878°C, and the coiling process is: 30 meters at the head at 730°C, 40 meters at the tail at 730°C, and the remaining sections 680°C, the specification of hot-rolled coils is: 4.0×1282mm; the hot-rolled coils are uncoiled on the pickling mill, stretched, straightened and broken, and then enter shallow groove turbulent pickling to remove the surface oxide scale, and then enter the 5-stand cold tandem mill to obtain chilled hardness. Coil, the reduction rate is 75%. Chilled coils go through the cleaning section to remove the surface oil and then enter the vertical continuous annealing furnace. The temperature in the heating section is 760°C, and the temperature in ...

Embodiment 2

[0029] The chemical composition of the slab is: C: 0.037wt%, Si: 0.02wt%, Mn: 0.27wt%, P: 0.011wt%, S: 0.004wt%, Alt: 0.052wt%, N: 0.004wt%, the rest Basically Fe and other trace elements.

[0030] Reheat the head of the slab to 1250°C and the tail to 1270°C for 3.3 hours. The final rolling temperature is 882°C. 680°C, the specification of hot-rolled coils is: 4.0×1261mm; the hot-rolled coils are uncoiled on the pickling mill, stretched, straightened and broken, and then enter the shallow groove turbulent pickling to remove the surface oxide scale, and then enter the 5-stand cold tandem rolling mill to obtain chilled hardness. Coil, the reduction rate is 75%. Chilled coils go through the cleaning section to remove the surface oil and then enter the vertical continuous annealing furnace. The temperature in the heating section is 760°C, and the temperature in the fast cooling section is 440°C. Coiling is a finished product, and the flat elongation rate is 1.1%, and the finished...

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Abstract

The invention discloses a production method for improving strip coil through-reel mechanical property uniformity. The invention belongs to the technical field of steel rolling. The method comprises the steps of slab reheating, rough cooling, fine rolling, laminar flow cooling, and reeling, such that hot-rolled coil is obtained. The hot-rolled coil is subjected to acid pickling, cold rolling, annealing, and flattening, and a finished product is reeled. According to the reeling process, a U-shape reeling process is used for controlling the reeling temperature. The reeling temperature is that: a temperature of 710-750 DEG C is applied at 30m at the head of the steel coil and 40m at the rear of the steel coil, and a temperature of 660-700 DEG C is applied at the middle part of the steel coil. According to the invention, steel strip hot rolling process parameters are optimized, such that high-quality steel strip with uniform size and performance can be obtained, and user application requirement is satisfied. Also, accidents such as drawing breakage and stamping cracking in subsequent production processes are prevented.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a production method for improving the uniformity of the mechanical properties of strip steel coils. Background technique [0002] In the hot rolling of strip steel, the strip steel is coiled to form a steel coil after laminar flow cooling. During the cooling process after coiling, the inner ring and outer ring of the steel coil are in contact with the outside world, and the cooling rate at the head and tail of the steel coil is greater than that of the steel coil. The cooling rate in the middle of the steel coil causes uneven precipitation of two-phase particles, differences in the dislocation density in the ferrite matrix, and differences in the nucleation and growth process of ferrite during the phase transformation process, resulting in the difference between the head and tail of the steel coil and the middle part. The grain size is uneven, and the grain size in the midd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02
Inventor 杜倩阳代军方圆崔阳徐芳杨孝鹤艾娇建王文广黄来情梁轩郭志飞
Owner SHOUGANG CORPORATION
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