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Boracic low-carbon hot rolling pickling plate and production method thereof

A hot-rolled pickling and pickling technology, applied in the direction of temperature control, etc., can solve problems such as low finish rolling temperature, mixed crystal defects at the finish rolling temperature, and mixed crystal defects at the rolling edge of the steel plate, so as to improve the performance of the steel plate and improve the Manipulability, tissue uniform effect

Inactive Publication Date: 2018-09-11
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Surface quality control requires easy-to-remove scale control measures in the hot rolling stage, such as the distribution and pressure of descaling water, heating temperature, etc., and these measures will lead to low final rolling temperature of the steel plate, especially the rolling edge temperature of the steel plate If the temperature is too low, mixed crystal defects will appear when the final rolling temperature is too low, and mixed crystal defects often appear on the rolling edge of the steel plate
[0004] At present, the setting range of the final rolling temperature in the hot rolling stage of low-carbon hot-rolled pickled plate is generally 870-930°C, but for low-carbon hot-rolled pickled plate, the final rolling temperature is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In this example, in terms of weight percentage, the alloy composition of the boron-containing low-carbon hot-rolled pickling plate with a thickness of 2.0mm is: C: 0.027%, Si: 0.01%, Mn: 0.25%, P: 0.014%, S: 0.006 %, Alt (full aluminum): 0.030%, B: 0.0011%, N: 0.0036%, and the balance is iron and unavoidable impurities.

[0015] In this embodiment, the production method of boron-containing low-carbon hot-rolled pickling plate with a thickness of 2.0 mm is as follows:

[0016] 1) Molten steel is poured into billets according to conventional methods;

[0017] 2) Place the billet in a walking heating furnace and heat it at 1180°C for 60 minutes; after the billet comes out of the furnace, it is descaled by high-pressure water, and then enters the rough rolling mill for rolling, and the rough rolling descaling water is put in, and the rolling temperature is 1110°C ; After rough rolling, the intermediate billet temperature is 1060°C, and then enters the finish rolling unit f...

Embodiment 2

[0019] In this example, in terms of weight percentage, the alloy composition of the boron-containing low-carbon hot-rolled pickling plate with a thickness of 4.0mm is: C: 0.04%, Si: 0.012%, Mn: 0.21%, P: 0.013%, S: 0.008 %, Alt (full aluminum): 0.040%, B: 0.0016%, N: 0.0048%, and the balance is iron and unavoidable impurities.

[0020] In this embodiment, the production method of boron-containing low-carbon hot-rolled pickling plate with a thickness of 4.0 mm is as follows:

[0021] 1) Melt steel is smelted according to conventional methods, and poured into billets;

[0022] 2) Place the billet in a walking heating furnace and heat it at 1200°C for 60 minutes; after the billet comes out of the furnace, it is descaled by high-pressure water, and then enters the rough rolling mill for rolling, and the rough rolling descaling water is put in, and the rolling temperature is 1130°C ; After rough rolling, the intermediate billet temperature is 1050°C, and then it enters the finish ...

Embodiment 3

[0024] In this example, in terms of weight percentage, the alloy composition of the boron-containing low-carbon hot-rolled pickling plate with a thickness of 3.0 mm is: C: 0.038%, Si: 0.02%, Mn: 0.23%, P: 0.010%, S: 0.010 %, Alt (full aluminum): 0.020%, B: 0.0020%, N: 0.0038%, and the balance is iron and unavoidable impurities.

[0025] In this embodiment, the production method of boron-containing low-carbon hot-rolled pickling plate with a thickness of 3.0mm is as follows:

[0026] 1) Melt steel is smelted according to conventional methods, and poured into billets;

[0027] 2) Place the billet in a walking heating furnace and heat it at 1210°C for 60 minutes; after the billet comes out of the furnace, it is descaled by high-pressure water, and then enters the rough rolling mill for rolling, and the rough rolling descaling water is put in, and the rolling temperature is 1130°C ; After rough rolling, the intermediate billet temperature is 1050°C, and then it enters the finish ...

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Abstract

The invention relates to the field of hot rolling pickling plates, in particular to a boracic low-carbon hot rolling pickling plate and a preparation method thereof. Boron with the content of 0.0010-0.0030% is added into a low-carbon hot rolling pickling plate, wherein the thickness is larger than or equal to 2.0 mm and less than or equal to 6.0 mm, and thus based on the ideal structural performance, multiple kinds of measures for controlling the surface quality can be taken, so that steel plate mixed crystals are effectively avoided, and the problem of rolled edge mixed crystals is especiallysolved. The boron is added into the low-carbon hot rolling pickling plate to reduce the transformation temperature from austenite to ferrite, so that structural transformation does not happen at thefinishing rolling temperature of 840-860 DEG C at a hot rolling stage, that is to say, no mixed crystal defects exist, finally, the even structural performance is obtained, and meanwhile, an advantageis created for inputting a large amount of descaling water to overcome scale defects at the hot rolling stage.

Description

technical field [0001] The invention relates to the field of hot-rolled pickled plates, in particular to a boron-containing low-carbon hot-rolled pickled plate and a production method thereof. Background technique [0002] With the continuous improvement of steel rolling technology, the performance of hot-rolled pickled sheet is approaching that of cold-rolled sheet, so that "replacing cold with heat" can be realized technically. Hot-rolled pickled sheet is a product with high cost performance between cold-rolled sheet and hot-rolled sheet, and has a good market development prospect. Low-carbon hot-rolled pickled plates are the most widely used, and are mainly used in the automotive industry, compressor industry, machinery manufacturing industry, spare parts processing industry and stamping parts of various shapes. [0003] During the production of low-carbon hot-rolled pickled sheets, it is necessary to control both the surface quality and the microstructure properties. Bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C33/04B21B37/74C23G1/08
CPCC22C38/02B21B37/74C22C33/04C22C38/002C22C38/04C22C38/06C23G1/08
Inventor 康海军刘明辉曲鹏黄健王溪刚王旭生杨得草于立伟詹恒科王会忠薛文辉肖辉张猛程宏远左远鸿张海宾胡德威由宇王文澜邹伟赵大鹏黄亮关立凯隋鹏飞孙忠斌李铁张伟
Owner BENGANG STEEL PLATES
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