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Production method of aluminium deoxidation 20 Cr steel

A production method and technology for aluminum deoxidation, applied in the field of steelmaking, can solve the problems of poor pourability and difficulty of continuous casting of aluminum deoxidized 20Cr steel, and achieve the effects of increasing the pulling speed, improving the pourability and reducing the inclusions.

Inactive Publication Date: 2014-06-11
武汉钢铁有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a production method of aluminum deoxidized 20Cr steel, to solve the problems of poor castability and continuous casting difficulty of aluminum deoxidized 20Cr steel, so as to realize high efficiency and low cost production of essentially fine-grained 20Cr steel

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  • Production method of aluminium deoxidation 20 Cr steel

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Embodiment Construction

[0010] The present invention will be described in further detail below in conjunction with specific embodiments.

[0011] The production methods of the 20Cr steel in the embodiment of the present invention and the comparative example all include the steps of molten iron desulfurization, converter / electric furnace smelting, argon blowing in an argon station, LF furnace refining and billet continuous casting. The only difference lies in the process of LF furnace refining and billet continuous casting steps. Among them, the refining steps of the LF furnace in Examples 1 to 10 are as follows: argon is blown at the bottom of the LF furnace throughout the process, and the refining time is ≥ 20 minutes. The molten steel is fed into the Si-Ca line at 0.5 kg to 0.6 kg per ton of steel 3 to 5 minutes before the lifting of the LF furnace. After soft blowing for 3-4 minutes, lift the ladle to the continuous casting machine for continuous casting; the billet continuous casting steps are as...

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Abstract

The invention discloses a production method of aluminium deoxidation 20 Cr steel. The production method of the aluminium deoxidation 20 Cr steel comprises molten iron desulphurization, converter or electric furnace smelting, argon station argon blowing, LF (Ladle Furnace) refining and square billet continuous casting steps; in the LF refining step, argon is blown in the whole process by virtue of an LF, refining time is more than or equal to 20 minutes, molten steel is fed into a Si-Ca line in a ratio of 0.5-0.6kg per ton steel 3-5 minutes before the LF is lift, soft blowing is carried out for 3-4 minutes, and replacement continuous casting is carried out; in the square billet continuous casting step, degree of superheat is controlled to be 20-40 DEG C, pulling rate is 1.4-1.8m / min, and a low carbon steel crystallizer is adopted for protecting slag, electromagnetic stirring is carried out, automatic control of liquid level of the crystallizer is guaranteed; an argon sealing long nozzle is adopted for protecting pouring, and secondary oxidation of molten steel is prevented. By adopting the production method of the aluminium deoxidation 20 Cr steel, inclusions with high melting point in steel can be effectively reduced, pouring property of aluminium deoxidation 20 Cr steel can be improved, pulling rate of continuous casting of the aluminium deoxidation 20 Cr can be increased, production efficiency can be improved, production cost can be reduced, and number of continuous casting furnaces for the aluminium deoxidation 20 Cr steel is increased.

Description

technical field [0001] The invention relates to a production method of aluminum-deoxidized 20Cr steel, which belongs to the technical field of steelmaking. Background technique [0002] 20Cr steel is the most typical basic variety of chromium-based alloy structural steel, and has a huge market demand. It is widely used in manufacturing industries such as automobiles and mining machinery. The following or carburized parts with complex shapes and low load, such as gears, gear shafts, cams, piston pins, worms, etc.; or parts that require heat treatment with small deformation and high wear resistance, can be used for high frequency after carburizing Surface quenching; or quenched and tempered parts with high working speed and medium impact load, play an important role in my country's national economy and national defense construction. [0003] 20Cr, which has a simple process and low price, is an essentially coarse-grained steel. During carburizing at room temperature, the austen...

Claims

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Application Information

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IPC IPC(8): C21C7/00C22C33/04C22C38/00
Inventor 张帆范植金吴杰徐志周新龙丁礼权徐志东刘婳龙莉
Owner 武汉钢铁有限公司
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