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Continuous casting method of aluminum-containing peritectic high-strength automobile steel

A high-strength technology for automobile steel, which is applied in the field of continuous casting of aluminum-containing peritectic high-strength automobile steel, and can solve problems such as water blocking, unstable pouring, and cracks in the billet

Active Publication Date: 2020-08-04
SHOUGANG CORPORATION
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Problems solved by technology

[0004] The invention provides a continuous casting method of aluminum-containing peritectic high-strength automobile steel to solve or partly solve the problem that the high-strength automobile steel containing more aluminum peritectic is prone to cracks and water blocking during continuous casting, and cannot be poured stably technical problem

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  • Continuous casting method of aluminum-containing peritectic high-strength automobile steel

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Embodiment Construction

[0028] In order to enable those skilled in the technical field to which the application belongs to understand the application more clearly, the technical solutions of the application will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0029] During slab continuous casting, the tundish receives the molten steel transferred from the ladle, and then distributes it to each crystallizer through the tundish nozzle; the molten steel forms a certain thickness in the crystallizer through the cooling process control of the cooling water in the crystallizer. The casting slab of the primary slab shell; then the slab is stably pulled out from the crystallizer according to a certain pulling speed, and the slab is further cooled when passing through the secondary cooling section of the continuous casting machine to solidify the inside of the slab; then it is drawn and straightened , cutting, and finally obtain the finished slab.

[...

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Abstract

The invention discloses a continuous casting method of aluminum-containing peritectic high-strength automobile steel. The method comprises the following steps that in the molten steel pouring processof the aluminum-containing peritectic high-strength automobile steel, a stopper rod, an upper nozzle and an inter-sheet device are opened in a tundish for three-way argon blowing; crystallizer covering slag is used for casting protection, and the crystallizer covering slag comprises the chemical components of, in percentage by weight, 1.2 %-1.6 % of Al2O3, 35 %-45 % of CaO, 30 %-35 % of SiO2, 8 %-12 % of F, 1.0 %-2.0 % of (Na2O + K2O), 0.8 %-1.0 % of MgO and 4 %-6 % of C; a crystallizer adopts a first preset weak cooling process and a high-frequency small-amplitude process is put into use, wherein the first preset weak cooling process is used for controlling the heat flux density of a meniscus area of the crystallizer to be 1.0-2.0 MW.m <-2>; a casting blank of the aluminum-containing peritectic high-strength automobile steel is cast by a continuous casting machine at a preset casting speed; and a continuous casting secondary cooling section adopts a second preset weak cooling process.According to the scheme, surface cracks and bonding defects of the casting blank are remarkably reduced.

Description

technical field [0001] The application relates to the technical field of high-strength automobile steel smelting, in particular to a continuous casting method for aluminum-containing peritectic high-strength automobile steel. Background technique [0002] The development trend of modern automobiles is light weight, energy saving, anti-corrosion, safety and comfort. Reducing energy consumption, reducing environmental pollution and saving limited resources is a very important and urgent problem that people are facing today. Reducing the weight of automobiles is one of the important measures to improve the fuel economy and save energy consumption of automobiles. Data show that for every 10% reduction in vehicle mass, fuel consumption will drop by 6-8%, and emissions will drop by 4%. Aluminum-containing peritectic high-strength automotive steel is based on the traditional dual-phase steel ferrite plus martensite dual-phase structure, introducing a certain amount of retained aus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111B22D11/117B22D11/053B22D11/055B22D11/07B22D11/22
CPCB22D11/053B22D11/055B22D11/07B22D11/111B22D11/117B22D11/22B22D11/225
Inventor 罗衍昭季晨曦何文远关顺宽张志敏杨晓山王胜东刘延强杨敬铭王宝动杨春宝曾智安泽秋赵长亮
Owner SHOUGANG CORPORATION
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