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Anti-nodulation high-sulfur non-quenched and tempered steel smelting technology

A non-quenched and tempered steel, anti-nodulation technology, applied in the improvement of process efficiency, furnace type, furnace and other directions, 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. The effect of product scrapping, stable pouring curve and no fluctuation of liquid level

Active Publication Date: 2020-09-15
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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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, particularly relates to an anti-nodulation high-sulfur non-quenched and tempered steel smelting technology, and aims to solve the problem that during the smelting process of specific steel composition, inclusion in steel finally wraps calcium sulfide in the form of high-melting-point magnesium aluminate spinel type inclusion to form composite inclusion. Control over refining slag in the key operating process is clear-cut, for example, during refining, the furnace clinker binary alkalinity (CaO / SiO2) 2.5-3.5 is controlled to improve the adsorption performance of the furnace clinker to the inclusions; through controlling the ternary alkalinity, the furnace clinker liquidity is improved, and the nodulation key factor can be ensured to be controlled during the continuous casting process through mutual collaboration. According to the anti-nodulation high-sulfur non-quenched and tempered steel smeltingtechnology, the wire feeding sequence and the time requirement after VD vacuum treatment are defined, conversion of oxide inclusion to low-melting-point inclusion is effectively controlled, at the same time, generation of plenty of high-melting-point sulfide inclusion is prevented, and finally, during the continuous casting process of molten steel, the pouring curve is steady, and the liquid surface 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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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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