A kind of medium and high carbon steel 75cr hot-rolled pickling plate and its production method

A hot-rolled pickling and production method technology, which is applied in the field of steel rolling, can solve the problems affecting the yield of pickled plate products, etc., and achieve the effects of no quality defects, reduced silicon content, and reduced production

Active Publication Date: 2021-02-26
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 medium-high carbon steel 75Cr hot-rolled pickling plate and its production method, aiming at solving the technology that the yield of pickling plate products is seriously affected by surface quality problems in the current production process of medium-high carbon steel 75Cr pickling plate question

Method used

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  • A kind of medium and high carbon steel 75cr hot-rolled pickling plate and its production method
  • A kind of medium and high carbon steel 75cr hot-rolled pickling plate and its production method
  • A kind of medium and high carbon steel 75cr hot-rolled pickling plate and its production method

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Effect test

Embodiment 1

[0041] A medium-high carbon steel 75Cr hot-rolled pickling plate, according to weight percentage, its composition includes: C: 0.72%, Si: 0.10%, Mn: 0.60%, Cr: 0.3%, P: 0.015%, S: 0.010%, V: 0.02%, the rest is iron and unavoidable impurities; prepare a qualified slab with the above composition and go through 150 tons of converter vanadium extraction, 150 tons of converter smelting, LF refining, and slab continuous casting; place the slab in Heating in a heating furnace, wherein the temperature of the slab entering the heating furnace is ≥400°C, the heating temperature of the slab in the heating furnace is 1180°C, and the heating time is 130 minutes, and then the slab is taken out of the heating furnace and subjected to high-pressure water Phosphorus removal, the outlet temperature is 1020°C after 5 rough rolling passes in the rough rolling mill, and the exit temperature is 880°C after passing through the hot coil box, and then 7 passes through the finish rolling mill. After dis...

Embodiment 2

[0043] A medium-high carbon steel 75Cr hot-rolled pickling plate, according to weight percentage, its composition includes: C: 0.74%, Si: 0.12%, Mn: 0.70%, Cr: 0.4%, P: 0.013%, S: 0.009%, V: 0.03%, the rest is iron and unavoidable impurities; prepare a qualified slab with the above composition and go through 150 tons of converter vanadium extraction, 150 tons of converter smelting, LF refining, and slab continuous casting; place the slab in Heating in a heating furnace, wherein the temperature of the slab entering the heating furnace is ≥400°C, the heating time of the slab in the heating furnace is 150 minutes, and the heating temperature is 1190°C, and then the slab is taken out of the heating furnace and subjected to high-pressure water Phosphorus removal, the outlet temperature is 1030°C after 5 rough rolling passes through the rough rolling mill, and the exit temperature is 890°C after passing through the hot coil box, and then 7 passes through the finish rolling mill. Afte...

Embodiment 3

[0045] A medium-high carbon steel 75Cr hot-rolled pickling plate, according to weight percentage, its composition includes: C: 0.76%, Si: 0.13%, Mn: 0.80%, Cr: 0.5%, P: 0.012%, S: 0.008%, V: 0.04%, the rest is iron and unavoidable impurities; prepare a qualified slab with the above composition and go through 150 tons of converter vanadium extraction, 150 tons of converter smelting, LF refining, and slab continuous casting; place the slab in Heating in a heating furnace, wherein the temperature of the slab entering the heating furnace is ≥400°C, the heating time of the slab in the heating furnace is 170 minutes, and the heating temperature is 1220°C, and then the slab is taken out of the heating furnace and subjected to high-pressure water Phosphorus removal, the outlet temperature is 1050°C after 5 rough rolling passes through the rough rolling mill, and the exit temperature is 900°C after passing through the hot coil box, and then 7 passes through the finish rolling mill. Afte...

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Abstract

The invention provides a medium-high carbon steel 75Cr hot-rolled pickled plate and a production method thereof, which belong to the technical field of steel rolling. The components of the medium-high carbon steel 75Cr hot-rolled pickled plate include: C: 0.72-0.80%, Si : 0.1~0.15%, Mn: 0.60~90%, Cr: 0.30~0.60%, P≤0.015%, S≤0.010%, V: 0.02~0.05%, the rest is iron and unavoidable impurities; its production method includes The following steps are as follows: preparing a slab and placing the slab in a heating furnace for heating, then performing high-pressure water dephosphorization, and then performing rolling, cooling, coiling and slow cooling on the slab. In the present invention, a medium-high carbon steel 75Cr hot-rolled pickling plate adds vanadium to the steel to increase the strength, reduces the silicon content in the steel, and reduces the generation of scale through the control of temperature and time. After pickling, the surface quality is good and the surface is not rough. There are quality defects, which meet the production requirements of pickling boards.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and more specifically relates to a medium-high carbon steel 75Cr hot-rolled pickling plate and a production method thereof. Background technique [0002] Hot-rolled pickled sheet means that the hot-rolled coil is processed by the pickling unit to remove the oxide scale on the surface of the hot-rolled coil, and the surface is oiled to meet the use requirements of some cold-rolled sheets. The surface quality of the pickled sheet is higher , the dimensional accuracy is better controlled, and the price is lower than that of cold-rolled sheets, and the demand in the market is relatively large. [0003] Under normal conditions, the pickling plate mainly produces low-carbon steel, because the pickling plate has high requirements on the surface. Surface pickling quality of carbon steel 75Cr hot-rolled coils. After pickling of hot-rolled coils, the surface color will become dark, which will cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/24C22C38/04C22C38/02C21D8/02
CPCC21D8/0205C21D8/0247C22C38/002C22C38/02C22C38/04C22C38/24
Inventor 梁静召吴雨晨高建国杨坤周艳群李青英
Owner HEBEI IRON AND STEEL
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