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

A hot-rolled pickling and pickling technology, which is applied in the direction of temperature control, can solve the problems of low finish rolling temperature, lower billet temperature, and deterioration of mechanical properties, so as to achieve high hit rate of structure and performance, increase yield rate, and increase reliability. operational effect

Pending 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

[0003] At present, the setting range of the final rolling temperature in the hot rolling stage of the low-carbon hot-rolled pickling plate with a thickness of ≤1.6mm is generally 870-930°C, which is difficult to control.
The main reason is that the low-carbon hot-rolled pickled plate needs to control the scale during the hot rolling stage, and the control of the scale requires measures such as low-temperature heating, high-pressure descaling water, and multi-point descaling. Many measures directly reduce the temperature of the billet. , leading to low finish rolling temperature, it is difficult to reach the control range of 870-930°C
Control measures to reduce scale can increase the finish rolling temperature, but affect the surface quality of the steel plate; while the low finish rolling temperature will easily lead to mixed crystals in the structure of the steel plate and deteriorate the mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 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 1.6mm is: C: 0.04%, Si: 0.020%, Mn: 0.18%, P: 0.015%, S: 0.010 %, Alt (full aluminum): 0.026%, B: 0.0015%, N: 0.0040%, and the balance is iron and unavoidable impurities.

[0016] In this embodiment, the production method of boron-containing low-carbon hot-rolled pickling plate with a thickness of 1.6 mm is as follows:

[0017] 1) Molten steel is poured into billets according to conventional methods;

[0018] 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 1120°C ; After rough rolling, the intermediate billet temperature is 1050°C, and then it enters the finish rolling uni...

Embodiment 2

[0020] 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 1.5mm is: C: 0.03%, Si: 0.010%, Mn: 0.20%, P: 0.012%, S: 0.005 %, Alt (full aluminum): 0.033%, B: 0.0010%, N: 0.0042%, and the balance is iron and unavoidable impurities.

[0021] In the present embodiment, the production method of boron-containing low-carbon hot-rolled pickling plate with a thickness of 1.5mm is as follows:

[0022] 1) Melt steel is smelted according to conventional methods, and poured into billets;

[0023] 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 1040°C, and then it enters the f...

Embodiment 3

[0025] 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 1.4mm is: C: 0.02%, Si: 0.010%, Mn: 0.20%, P: 0.012%, S: 0.005 %, Alt (full aluminum): 0.033%, B: 0.0010%, N: 0.0030%, and the balance is iron and unavoidable impurities.

[0026] In this embodiment, the production method of boron-containing low-carbon hot-rolled pickling plate with a thickness of 1.4 mm is as follows:

[0027] 1) Melt steel is smelted according to conventional methods, and poured into billets;

[0028] 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 1040°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 with the thickness lower than or equal to 1.6 mm and a production method thereof. By means of the boracic low-carbon hot rolling pickling plate with the thickness lower than or equal to 1.6 mm and the production method thereof, surface quality control and structure property matching are effectively achieved, and boron is added into a low-carbon hot rolling pickling plate to reduce the transformation temperature from austenite to ferrite, so that structural transformation does not happen at the finishing 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 advantage is 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 sheets, in particular to a boron-containing low-carbon hot-rolled pickled sheet with a thickness of ≤1.6 mm and a production method thereof. Background technique [0002] Low-carbon hot-rolled pickled sheets are widely used in automobiles, home appliances and other industries due to their excellent surface quality and mechanical properties. The surface quality requirements are strict, and there are no defects such as pits and scales. It is necessary to take easy-to-remove scale controls during the hot rolling stage. Measures, such as the distribution and pressure of descaling water, heating temperature, etc., and these measures affect the final rolling temperature of the steel plate, and the final rolling temperature affects the microstructure and properties. [0003] At present, the setting range of the final rolling temperature in the hot rolling stage of the low-carbon hot-rolled pickling plat...

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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