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A kind of carbon steel 45mn hot-rolled pickling plate and production method thereof

A technology of hot-rolled pickling and carbon steel, which is applied in the field of steel rolling, can solve the problems of poor quality, low qualified rate of finished products, and many scales on the surface, so as to reduce the generation of scales, have good surface quality, and meet production requirements. Effect

Active Publication Date: 2021-07-20
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a carbon steel 45Mn hot-rolled pickling plate and its production method, aiming to solve the technical problems of high-quality vanadium-containing carbon steel pickling plate with many scales on the surface, poor quality and low qualified rate of finished products

Method used

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  • A kind of carbon steel 45mn hot-rolled pickling plate and production method thereof
  • A kind of carbon steel 45mn hot-rolled pickling plate and production method thereof
  • A kind of carbon steel 45mn hot-rolled pickling plate and production method thereof

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specific Embodiment approach

[0036] As a specific embodiment of the production method of a hot-rolled carbon steel 45Mn pickling plate provided by the present invention, the rolling includes: rolling the slab that has been dephosphorized by high-pressure water through a rough rolling mill and a finish rolling mill. .

[0037] In this embodiment, the slab dephosphorized by high-pressure water is sequentially subjected to rough rolling, hot coil box and finish rolling to obtain a hot-rolled plate.

[0038]As a specific embodiment of the production method of a hot-rolled carbon steel 45Mn pickling plate provided by the present invention, the outlet temperature of the roughing mill is 1020-1080°C; the outlet temperature of the finishing mill is 860-910°C; After five rolling passes in the roughing mill and seven rolling passes in the finishing mill.

[0039] In order to more specifically illustrate the technical solution of the present invention, the following examples are now used for detailed description. ...

Embodiment 1

[0041] A hot-rolled carbon steel 45Mn pickling plate is calculated by weight percentage, and its composition includes: C: 0.49%, Si: 0.17%, Mn: 0.60%, P: 0.013%, S: 0.008%, V: 0.01%, ALs: 0.02%, the rest is iron and unavoidable impurities; prepare qualified slabs with the above components and go through 150 tons of converter vanadium extraction, 150 tons of converter smelting, LF refining, and continuous casting of slabs; place the slabs in Heating in the heating furnace, the heating time is 120 minutes, and the heating time is 1240 ° C. After the slab is taken out of the heating furnace, it is dephosphorized by high-pressure water. box, and then through the finishing mill for 7 passes, the outlet temperature is 870°C, after dispersive cooling, the coiling temperature is 700°C, the thickness is 3.0mm, the width is 1250mm, the yield strength is 340MPa, the tensile strength is 620MPa, and the elongation The qualified hot-rolled high-quality carbon steel pickling plate with a rat...

Embodiment 2

[0043] A hot-rolled carbon steel 45Mn pickling plate is calculated by weight percentage, and its composition includes: C: 0.50%, Si: 0.18%, Mn: 0.62%, P: 0.015%, S: 0.010%, V: 0.01%, ALs: 0.03%, the rest is iron and unavoidable impurities; prepare qualified slabs with the above components and go through 150 tons of converter vanadium extraction, 150 tons of converter smelting, LF refining, and continuous casting of slabs; place the slabs in Heating in the heating furnace, the heating time is 130 minutes, and the heating time is 1250 ° C. After the slab is released from the heating furnace, it is dephosphorized by high-pressure water. box, and then through the finishing mill for 7 passes, the outlet temperature is 880°C, after dispersion cooling, the coiling temperature is 710°C, the thickness is 6.0mm, the width is 1250mm, the yield strength is 350MPa, the tensile strength is 630MPa, and the elongation The qualified hot-rolled high-quality carbon steel pickling plate with a ra...

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Abstract

The invention provides a carbon steel 45Mn hot-rolled pickled plate and a production method thereof, belonging to the technical field of steel rolling. The components of the carbon steel 45Mn hot-rolled pickled plate include: C: 0.49% to 0.54%, Si : 0.17% ~ 0.23%, Mn: 0.60% ~ 0.75%, P≤0.020%, S≤0.015%, ALs: 0.02% ~ 0.06%, V: 0.02% ~ 0.05%, the rest is iron and unavoidable impurities; The production method comprises the following steps: preparing a slab, heating the slab in a heating furnace, dephosphorizing with high-pressure water, rolling, cooling and coiling the slab. A carbon steel 45Mn hot-rolled pickling plate of the present invention adds vanadium to the steel to increase the strength, reduces the silicon content in the steel, and reduces the generation of scale by controlling the temperature. After pickling, the surface quality is good and meets the requirements of the pickling plate. Production requirements.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and more specifically relates to a carbon steel 45Mn hot-rolled pickling plate and a production method thereof. Background technique [0002] Hot-rolled pickled sheet is a product between cold-rolled and hot-rolled. It refers to that the hot-rolled coil is treated by a pickling unit to remove the oxide scale on the surface of the hot-rolled coil, and to oil the surface of the steel coil to prevent rust. Its high surface quality control and high dimensional accuracy control can replace some cold-rolled plates to meet the user's requirements. [0003] Under normal conditions, the pickling plate mainly produces low-carbon steel, and the surface oxide scale is removed by pickling. In the production process of high-quality carbon steel, due to the high carbon content, the composition, structural characteristics and thickness of the oxide scale in the hot-rolling process affect the surface pickl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02
CPCC21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 梁静召高建国张斯杨永波肖鹏王源硕
Owner HEBEI IRON AND STEEL
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