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Hot-rolled pickled plate and production method thereof

A hot-rolled pickling and production method technology, applied in the field of steel rolling, can solve the problems that low-carbon steel is difficult to obtain quasi-acicular ferrite structure, etc., to eliminate scratches and roll marks defects, reduce work hardening, and improve surface quality effect

Active Publication Date: 2015-04-01
ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only applicable to structural steel with a carbon content of 0.13-0.19%, and is not suitable for low-carbon hot-rolled pickled coils with a carbon content in the range of 0.02-0.06%. This is mainly due to the fact that low-carbon steel is difficult to obtain. The "quasi-acicular ferrite structure" described

Method used

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  • Hot-rolled pickled plate and production method thereof
  • Hot-rolled pickled plate and production method thereof
  • Hot-rolled pickled plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The main components of the hot-rolled pickled sheet in this example are shown in Table 1. The preparation method is as follows: heat the continuous casting slab of the composition to 1220°C, rough roll it into a 35mm intermediate slab through R1 and R2 stands, and The hot coil box is kept warm before finishing rolling. The rough rolling reduction rate is 85%, and the rough rolling exit temperature is 1050°C. Then the intermediate billet is continuously rolled into 4mm strip steel by F1~F7 seven stands. The final rolling temperature of the strip is 880°C. The strip is air-cooled at the exit of the finishing mill for 8s, and then cooled in the rear section of the laminar flow cooling section, and the coiling temperature is 668°C. The steel coils cooled to room temperature are uncoiled and straightened on the push-pull pickling production line, then pickled, rinsed and dried, and cut and oiled to the final product. The concentrations of the four acid tanks during the pi...

Embodiment 2

[0040]The main components of the hot-rolled pickled sheet in this example are shown in Table 1. The preparation method is as follows: heating the continuous casting slab of the composition to 1180°C, rough rolling it into a 35mm intermediate slab through R1 and R2 stands, and The hot coil box is kept warm before finishing rolling. The rough rolling reduction rate is 85%, and the rough rolling exit temperature is 1000°C. Then the intermediate billet is continuously rolled into 3.6mm strip steel by F1~F7 seven stands. The final rolling temperature of the strip is 870°C. The strip is air-cooled at the exit of the finishing mill for 6s, and then cooled in the latter section of the laminar flow cooling section, and the coiling temperature is 670°C. The steel coils cooled to room temperature are uncoiled and straightened on the push-pull pickling production line, then pickled, rinsed and dried, and cut and oiled to the final product. The concentrations of the four acid tanks duri...

Embodiment 3

[0042] The main components of the hot-rolled pickled sheet in this example are shown in Table 1. The preparation method is as follows: heating the continuous casting slab of the composition to 1200°C, rough rolling it into a 35mm intermediate slab by R1 and R2 stands, and The hot coil box is kept warm before finishing rolling. The rough rolling reduction rate is 85%, and the rough rolling exit temperature is 1050°C. Then the intermediate billet is continuously rolled into 3mm strip steel by F1~F7 seven stands. The final rolling temperature of the strip is 870°C. The strip is air-cooled at the exit of the finishing mill for 6s, and then cooled in the latter section of the laminar flow cooling section, and the coiling temperature is 660°C. The steel coils cooled to room temperature are uncoiled and straightened on the push-pull pickling production line, then pickled, rinsed and dried, and cut and oiled to the final product. The concentrations of the four acid tanks during the...

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Abstract

The invention discloses a hot-rolled pickled plate and a production method thereof. According to the hot-rolled pickled plate, based on a common low carbon steel component system, by reasonably adding microalloy elements B and Ti and combining insulation of a coilbox before finish rolling and relaxation and cooling after finish rolling, the effects of controlling structures and a precipitated phase as well as reducing KESHI gas mass in the low carbon steel are achieved, so that the stress difference of upper and lower yield points of a hot rolled strip is reduced to below 5MPa and the defect of surface cross breaks of the hot rolled strip in a pickling, uncoiling and straightening process is eliminated. Not only is the defect of surface cross breaks of the hot rolled strip solved, but also the conventional production process of eliminating cross breaks by temper rolling is further avoided, thereby shortening the time and lowering the cost for actual production of a steel mill. The production method is an economical and effective production method of the hot-rolled pickled plate. The hot-rolled pickled plate disclosed by the invention can be widely applied to industries of household appliances, automobiles and hardware mechanical and electrical products.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a hot-rolled pickled plate and a production method thereof. Background technique [0002] Hot-rolled pickled plate is an intermediate product between hot-rolled plate and cold-rolled plate. The hot-rolled pickled plate is made of high-quality hot-rolled coils. The steel surface is oxidized, and then the hot-rolled pickled coil is obtained by trimming, smoothing and oiling. Compared with hot-rolled coils, hot-rolled pickled sheets have good surface quality and are easy to weld, oil and paint. With its high performance and low cost, hot-rolled pickled sheet is widely used in household appliances, automobiles, hardware, electromechanical and other industries, realizing the purpose of replacing cold-rolled sheet with hot-rolled sheet, and has a good market application prospect. [0003] However, in the production process of low-carbon hot-rolled pickled plate, cro...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
CPCC21D8/0205C21D8/0221C22C38/02C22C38/04C22C38/06C22C38/14C22C38/32
Inventor 吴圣杰岳重祥李化龙
Owner ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD
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