Production method for smelting F55 dual-phase steel in intermediate frequency furnace
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A production method and technology of an intermediate frequency furnace, which are applied in the field of steelmaking, can solve the problems of low power consumption and investment in smelting time, difficulty in deoxidation, and high inclusion content, and achieve the effects of good power saving, improved smelting efficiency and high purity.
Active Publication Date: 2022-01-28
JIANGXI BAOSHUNCHANG SPECIAL ALLOY CO LTD
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[0003] The working frequency of the intermediate frequency induction melting furnace is between 50Hz-10kHz, which needs to be adjusted by frequency converter. It has high electrical efficiency, high thermal efficiency, short melting time, low power consumption, less land occupation, low investment, flexible production and easy Implementation of process automation and other advantages, but the intermediate frequency furnace smelting F55 dual-phase steel in the prior art has technical problems such as difficult deoxidation and high inclusion content
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Embodiment 1
[0027] The production method of intermediate frequency furnace smelting F55 dual-phase steel comprises the following steps:
[0028] S1. Prepare molten steel according to the following mass fractions in the intermediate frequency furnace: 0.022% C, 0.5% Si, 0.45% Mn, 0.0197% P, 0.014% S, 25.0% Cr, 7.0% Ni , 3.5% Mo, 0.273% N, and the balance is Fe;
[0029] S2. Add 20kg of molten steel bottom slag into the intermediate frequency furnace and melt it; the bottom slag is composed of CaO and CaF 2 Composition, CaO and CaF 2 The mass ratio is 7:3;
[0030] S3, adding 0.5kg of Si-Ca wire after melting to carry out deoxidation;
[0031] S4. After adding the Si-Ca wire for 10 minutes, remove the slag, and then add the slag material, which is high alumina refractory brick fragments and CaF 2 Create new slag; among them, the composition of high alumina refractory bricks is Al 2 o 3 and SiO 2 , Al 2 o 3 The mass fraction is 60%, SiO 2 The quality score is 40%;
[0032] S5. Add...
Embodiment 2
[0037] The production method of intermediate frequency furnace smelting F55 dual-phase steel comprises the following steps
[0038] S1. Prepare molten steel according to the following mass fractions in the intermediate frequency furnace: 0.022% C, 0.5% Si, 0.45% Mn, 0.0197% P, 0.014% S, 25.0% Cr, 7.0% Ni , 3.5% Mo, 0.273% N, and the balance is Fe;
[0039] S2. Add 30kg of bottom slag to the intermediate frequency furnace and melt it; the bottom slag is composed of CaO and CaF 2 Composition, CaO and CaF 2 The mass ratio is 7:3;
[0040] S3, adding 2kg of Si-Ca wire after melting to carry out deoxidation;
[0041] S4. After adding the Si-Ca wire for 10 minutes, remove the slag, and then add the slag material, which is high alumina refractory brick fragments and CaF 2 Create new slag; among them, the composition of high alumina refractory bricks is Al 2 o 3 and SiO 2 , Al 2 o 3 The mass fraction is 60%, SiO 2 The quality score is 40%;
[0042] S5. Add the deoxidizer of 2...
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Abstract
The invention provides a production method for smelting F55 dual-phase steel in an intermediate frequency furnace. The production method comprises the following steps that S1, molten steel is prepared in the intermediate frequency furnace according to the following ingredients in percentage by mass: less than or equal to 0.03% of C, less than or equal to 1.00% of Si, less than or equal to 1.00% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 24.0%-26.0% of Cr, 6.0%-8.0% of Ni, 3.0%-4.0% of Mo, 0.2%-0.3% of N and the balance of Fe; S2, abottom slag accounting for 2% of the weight of the molten steel is added into the intermediate frequency furnace, and melting is conducted; S3, after melting down, a Si-Ca wire is added for deoxidation; S4, slagging off is conducted after adding Si-Ca wires for 10 minutes, and high-aluminum refractory brick fragments and CaF2 are added to make new slag; S5, a deoxidizing agent is added into the slag layer in batches for first diffusion deoxidation; S6, components in front of the furnace are sampled and analyzed, FeCrNi alloy and alloy elements of Si, Mn, Mo and N are supplemented, and then diffusion deoxidation for the second time is conducted; and S7, the slag amount is adjusted, and tapping is conducted after white slag is kept for 15 minutes. Compared with the prior art, the oxygen content and the inclusion content in the intermediat requency smelting duplex stainless steel are reduced through reasonable intermediate frequency smelting burdening, deoxidation and slagging processes.
Description
technical field [0001] The invention relates to the technical field of steelmaking, in particular to a production method for smelting F55 dual-phase steel in an intermediate frequency furnace. Background technique [0002] F55 duplex steel is a high-alloy super duplex stainless steel with strong chloride corrosion resistance, high thermal conductivity and low thermal expansion coefficient. At the same time, the high content of chromium, molybdenum and nitrogen in F55 dual-phase steel makes it have high resistance to spot corrosion, crevice corrosion and other corrosion. It is mainly used in various strong corrosion environments such as chemical processing, petrochemical and submarine equipment. . [0003] The working frequency of the intermediate frequency induction melting furnace is between 50Hz-10kHz, which needs to be adjusted by frequency converter. It has high electrical efficiency, high thermal efficiency, short melting time, low power consumption, less land occupati...
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