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Recoiling withdrawal and straightening method for saving yield strength of cold-rolled strip steel lower than requirement

A yield strength and cold-rolled strip technology, applied in metal rolling, metal rolling, metal processing equipment, etc., can solve the problem of lowering the yield strength of cold-rolled finished products, and achieve the goal of reducing the loss of steel mills and improving the efficiency of steel grades. Effect

Pending Publication Date: 2022-07-15
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problem that the yield strength of cold-rolled finished products decreases due to the reduction of annealing temperature and strip speed, the present invention provides a reasonable recoil stretching and leveling method. After straightening, its yield strength reaches the standard or required range

Method used

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  • Recoiling withdrawal and straightening method for saving yield strength of cold-rolled strip steel lower than requirement
  • Recoiling withdrawal and straightening method for saving yield strength of cold-rolled strip steel lower than requirement
  • Recoiling withdrawal and straightening method for saving yield strength of cold-rolled strip steel lower than requirement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The cold-rolled finished coil with the grade of DC03-X, the coil number is C21069564C10C200, and its yield strength is less than the lower limit of the standard.

[0033] Table 1 Example 1 strip steel mechanical properties and dimensions before straightening

[0034] Yield strength / MPa Tensile strength / MPa Extend A80 / % Thickness / mm width / mm 131 280 47.8 0.787 1322.6

[0035] Table 2 DC03-X mechanical properties and size requirements

[0036]

[0037] The cold-rolled finished coil is re-rolled and straightened by using a two-bend, two-straightening and straightening machine. The specific steps are as follows:

[0038] Set the unwinding tension to 20kN, the rewinding tension to 38kN, the tension and straightening tension to 98N, the yield value to be 125MPa, and the elongation to be 0.6%.

[0039] The inlet is uncoiled, the head of the coil and the tail of the upper coil are welded, and the strip speed is controlled to be 10m / min when th...

Embodiment 2

[0044] The cold-rolled finished coil with the grade of CR340 / 590DP, the coil number is 2108806710C400, and its yield strength is less than the lower limit of the standard. The actual performance and size of the product are shown in Table 4. The mechanical properties and orders specified in the national standard (GB / T 20564.2-2017) The agreed size requirements are shown in Table 5.

[0045]Table 4 embodiment 2 strip steel mechanical properties and dimensions before straightening

[0046] Yield strength / MPa Tensile strength / MPa Extend A80 / % n value Thickness / mm width / mm 331 683 22.5 0.151 1.516 1362.8

[0047] Table 5 Mechanical properties and size requirements of CR340 / 590DP

[0048]

[0049] The cold-rolled finished coil is re-rolled and straightened by a two-bend, two-straightening and straightening machine. The specific steps are as follows:

[0050] Set the unwinding tension to 35kN, the rewinding tension to 55kN, the tension and straig...

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Abstract

The invention relates to the technical field of cold-rolled strip steel withdrawal and straightening processing, in particular to a recoiling withdrawal and straightening method for saving the yield strength of cold-rolled strip steel lower than the requirement, which comprises the following steps: (1) setting the uncoiling tension to be 12-36 kN, the coiling tension to be 28-82 kN, the withdrawal and straightening tension to be 90-260 kN, the yield value to be 85%-110% of the yield strength value of the strip steel before withdrawal and straightening, and the elongation to be 0.1%-1.2%; (2) the speed of the strip steel is controlled to be smaller than or equal to 15 m / min when the strip steel is welded and a welding seam passes through a withdrawal and straightening machine, the speed of the strip steel is controlled to be 40-210 m / min after the welding seam is taken out of the withdrawal and straightening machine, the welding seam of the strip steel is cut off, and the speed of the strip steel is smaller than or equal to 15 m / min when the strip steel penetrates into a coiling block of a coiling machine; and (3) cutting the head and the tail of the strip steel by 4-7m before and after the welding seam by taking the welding seam as a reference. After the cold-rolled strip steel is recoiled, pulled and straightened through the method, the yield strength reaches the standard or required range, and other mechanical property indexes and the strip steel size specification are slightly affected.

Description

technical field [0001] The invention relates to the technical field of drawing and leveling processing of cold-rolled strip steel, in particular to a re-coiling drawing-leveling method for saving the yield strength of cold-rolled strip steel from being lower than required. Background technique [0002] The cold-rolled and re-coiled stretch leveling is to put the stretch-bending straightening equipment on the cold-rolled and re-coiled production line to form a production line with the functions of strip steel re-coiling and stretch leveling. The cold-rolled and re-rolled straightening production line can achieve the functions of trimming the cold-rolled products, improving the shape, eliminating the yield platform, and improving the yield strength of the strip, which is indispensable in the production process of cold-rolled products. [0003] In the production process of continuous annealing or hot-dip galvanizing, there will inevitably be difficulties in welding, strip devia...

Claims

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Application Information

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IPC IPC(8): B21B15/00
CPCB21B15/00B21B2015/0057
Inventor 任东陈奭刘培星王乐侯晓英胡华东曹光明郝亮金光宇殷继丽
Owner SD STEEL RIZHAO CO LTD
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