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A kind of anti-nodulation high-sulfur non-quenched and tempered steel smelting process

A non-quenched and tempered steel, anti-nodulation technology, used in the improvement of process efficiency, furnace, electric furnace, etc., can solve the problems of poor stability of the pouring curve, fluctuation of the liquid level of the mold, slag inclusion under the skin of the rolled material, etc., to reduce the product The effect of scrapping, smooth pouring curve and no fluctuation of liquid level

Active Publication Date: 2021-05-28
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the high-sulfur non-quenched and tempered steel is an important variety of S-containing and Al-containing free-cutting non-quenched and tempered steel. Since the non-quenched and tempered steel contains high sulfur and aluminum, it is easy to generate high melting point composite inclusions during the casting process, that is, in The inclusions accumulated on the inner wall of the nozzle, which have the characteristics of high melting point and no deformation, are easy to accumulate and grow on the inner wall of the nozzle, causing nodules and blockages, resulting in fluctuations in the liquid level of the crystallizer, and poor stability of the pouring curve, resulting in a large amount of waste. At the same time, it is very easy to cause defects such as slag inclusion under the skin of subsequent rolling products.

Method used

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  • A kind of anti-nodulation high-sulfur non-quenched and tempered steel smelting process
  • A kind of anti-nodulation high-sulfur non-quenched and tempered steel smelting process
  • A kind of anti-nodulation high-sulfur non-quenched and tempered steel smelting process

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Embodiment 1

[0030] An anti-nodulation high-sulfur non-quenched and tempered steel, the smelted steel components are carbon 0.40%-0.45%, silicon 0.30%-0.50%, manganese 1.20%-1.50%, phosphorus ≤ 0.030%, sulfur 0.035%-0.075%, Chromium ≤0.25%, Nickel ≤0.25%, Copper ≤0.20%, Aluminum 0.010%-0.040%, Vanadium 0.06%-0.10%, Molybdenum ≤0.25%, Niobium 0.02%-0.04%, Nitrogen 0.0100%-0.0150%, and the rest iron;

[0031] The smelting process is;

[0032] (1) Electric furnace smelting controls the carbon content of the tapped steel, the carbon is controlled at 0.08% to 0.25%, and the tapped temperature is required to be greater than 1600° C. (the tapped temperature of embodiment 1 is between 1610-1622° C.). The phosphorus requirement at the end of electric furnace smelting is ≤0.018%, and slag is strictly prohibited in the tapping process to ensure that the finished product phosphorus is ≤0.020%.

[0033] Add 120kg of aluminum block / furnace to the deoxidation process of electric furnace tapping, add al...

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Abstract

The invention belongs to the technical field of non-quenched and tempered steel smelting, and in particular relates to a nodulation-preventing high-sulfur non-quenched and tempered steel smelting process. In order to solve the problem that in the smelting process of the specific steel composition of the present invention, the inclusions in the steel are finally composite inclusions formed by wrapping calcium sulfide with high melting point magnesium-aluminum spinel inclusions, the key operation process refining slag is clarified control, such as controlling the binary basicity of slag (CaO / SiO 2 ) 2.5-3.5 is to increase the adsorption performance of slag to this type of inclusions; adjust the fluidity of slag by controlling the ternary alkalinity, the key factor for controlling the nodulation in the continuous casting pouring process can be guaranteed after the two cooperate with each other, the present invention It also clarifies the line feeding sequence and time requirements after VD vacuum treatment, effectively controls the transition from oxide inclusions to low melting point inclusions, and at the same time prevents a large number of high melting point sulfide inclusions, and finally makes the pouring curve of molten steel stable during continuous casting. The liquid level does not fluctuate.

Description

technical field [0001] The invention belongs to the technical field of non-quenched and tempered steel smelting, and in particular relates to a nodulation-preventing high-sulfur non-quenched and tempered steel smelting process. Background technique [0002] Non-quenched and tempered steel is a green and energy-saving steel developed in the 1970s with the international energy shortage. Non-quenched and tempered steel eliminates the quenching and high-temperature tempering processes, which simplifies the production process and reduces energy consumption. It is widely used in auto parts. Among them, the high-sulfur non-quenched and tempered steel is an important variety of S-containing and Al-containing free-cutting non-quenched and tempered steel. Since the non-quenched and tempered steel contains high sulfur and aluminum, it is easy to generate high melting point composite inclusions during the casting process, that is, in The inclusions accumulated on the inner wall of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/06C22C38/60C22C38/12C22C38/42C22C38/46C22C38/48C22C38/44C21C7/06C21C7/076C21C7/10C21C5/52
CPCC21C5/52C21C7/0056C21C7/06C21C7/076C21C7/10C22C33/06C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/42C22C38/44C22C38/46C22C38/48C22C38/60Y02P10/20
Inventor 徐必靖任振海陈占领朱富强赵阳李亚刘泽
Owner ZENITH STEEL GROUP CORP
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