Production method for solving strip breakage of P-containing high-strength IF (Intermediate Frequency) hot rolling strip steel while withdrawal and straightening

A production method and technology of hot-rolled strip steel, applied in the field of steel rolling, can solve problems such as difficult smelting and not very ideal, and achieve the effect of simple method, remarkable effect, and high cost efficiency

Active Publication Date: 2014-02-05
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the smelting of B-containing steel is more difficult; on the other hand, the effect of solving the brittleness of strip steel is not very satisfactory

Method used

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  • Production method for solving strip breakage of P-containing high-strength IF (Intermediate Frequency) hot rolling strip steel while withdrawal and straightening
  • Production method for solving strip breakage of P-containing high-strength IF (Intermediate Frequency) hot rolling strip steel while withdrawal and straightening
  • Production method for solving strip breakage of P-containing high-strength IF (Intermediate Frequency) hot rolling strip steel while withdrawal and straightening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The hot-rolled high-Si, high-P, high-strength IF steel whose chemical composition meets the chemical composition shown in Example 1 in Table 3 is produced according to the following production process: continuous casting slab heating→rough rolling→finish rolling→laminar flow cooling →Coiled into hot-rolled raw material coils→Uncoiled from cold-rolled line→Stretching and straightening scale breaking→Pickling→Cold rolling→Continuous annealing→Coiled into finished steel coils. Among them, the temperature of the continuous casting slab entering the heating furnace is 700°C, the heating temperature in the heating furnace is 1280°C, the rough rolling pass is 1+5 mode, the temperature of RT2 is 1080°C, and the final rolling temperature is 920°C °C, the cooling rate of laminar cooling is 50 °C / s, and the temperature for coiling into hot-rolled raw material coils is 710 °C. The control of each process parameter of hot rolling is shown in Table 4. The chemical composition of the ...

Embodiment 2

[0048] The hot-rolled high-Si, high-P, high-strength IF steel whose chemical composition meets the chemical composition shown in Example 2 in Table 3 is produced according to the following production process: continuous casting slab heating→rough rolling→finish rolling→laminar cooling →Coiled into hot-rolled raw material coils→Uncoiled from cold-rolled line→Stretching and straightening scale breaking→Pickling→Cold rolling→Continuous annealing→Coiled into finished steel coils. Among them, the temperature of the continuous casting slab entering the heating furnace is 630°C, the heating temperature in the heating furnace is 1290°C, the rough rolling pass is 1+5 mode, the temperature of RT2 is 1090°C, and the final rolling temperature is 930°C °C, the cooling rate of laminar cooling is 45 °C / s, and the temperature for coiling into hot-rolled raw material coils is 700 °C. The control of various process parameters of hot rolling is shown in Table 4. The chemical composition of the s...

Embodiment 3

[0050] The hot-rolled high-Si, high-P, high-strength IF steel whose chemical composition meets the chemical composition shown in Example 3 in Table 3 is produced according to the following production process: continuous casting slab heating→rough rolling→finish rolling→laminar cooling →Coiled into hot-rolled raw material coils→Uncoiled from cold-rolled line→Stretching and straightening scale breaking→Pickling→Cold rolling→Continuous annealing→Coiled into finished steel coils. Among them, the temperature of the continuous casting slab entering the heating furnace is 670°C, the heating temperature in the heating furnace is 1270°C, the rough rolling pass is 1+5 mode, the temperature of RT2 is 1070°C, and the final rolling temperature is 930°C °C, the cooling rate of laminar cooling is 40 °C / s, and the temperature for coiling into hot-rolled raw material coils is 700 °C. The control of each process parameter of hot rolling is shown in Table 4. The chemical composition of the steel...

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Abstract

The invention provides a production method for solving strip breakage of a P-containing high-strength IF (Intermediate Frequency) hot rolling strip steel while withdrawal and straightening and relates to the technical field of steel rolling. In the hot-rolling process, a continuous casting sheet billet is heated by adopting a hot charging system, the hot-charging temperature is controlled to be 600-700DEG C, so that the segregation of an element P in the continuous casting process and the grain-boundary segregation of the element P in the cooling process of the sheet billet are avoided; the laminar flow cooling after finish rolling adopts a forepart intensive cooling mode and the cooling speed of strip steel is controlled to be 30-50DEG C / s; the coiling temperature is controlled to be 700+ / -10DEG C, so that the grain-boundary segregation of the element P is suppressed by high-temperature coiling. According to the production method for solving the strip breakage of the P-containing high-strength IF hot rolling strip steel while withdrawal and straightening, which is provided by the invention, under the conditions of not increasing the alloy cost, not influencing the production and not influencing the performances of the strip steel, the withdrawal and straightening and the strip breakage of the strip steel can be prevented by finely tuning the hot charging temperature, the coiling temperature, the cooling speed of the steel strip and other parameters in the rolling process. The method is simple and remarkable effects are realized.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a production method for solving the problem of tension and straightening strips of P-containing high-strength IF hot-rolled strip steel. Background technique [0002] P element generally exists as a harmful element in steel materials. Its easy grain boundary segregation will increase the ductile-brittle transition temperature of steel and increase the brittleness of steel materials. Therefore, most steel types have strict upper limit control on P content. However, due to the low solubility of P element in the Fe matrix, P element also has a certain strengthening effect. The strengthening effect of P element has been widely used in IF steel. IF steel is suitable for deep drawing and ultra-deep drawing because of its extremely low carbon content and soft steel quality. The characteristic of high-strength ultra-deep drawing IF steel is that it adopts ultra-low carbon design....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/26B21B37/74
Inventor 王畅于洋王林陈瑾徐海卫李飞李树森
Owner SHOUGANG CORPORATION
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