Vacuum smelting process for high-manganese high-aluminum high-titanium steel
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A vacuum smelting, high-aluminum technology, applied in the field of metallurgy, can solve the problems of aluminum and titanium oxidation loss, manganese volatilization and oxidation loss, and achieve the effect of ensuring volatility
Inactive Publication Date: 2019-05-21
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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[0004] The purpose of the present invention is to provide a vacuum smelting process for high manganese, high aluminum and high titanium steel. Through the design of the smelting process, a large amount of volatilization and oxidation
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Embodiment 1
[0020] The target composition requirements of high manganese, high aluminum and high titanium steel are: C 0.18% (wt.), Mn 6% (wt.), Ti 8% (wt.), Al 4.5% (wt.), B 4% (wt.) .), the balance is Fe and unavoidable impurity elements.
[0021] (1) Initial melting stage: The entire initial melting stage is carried out under vacuum conditions, the pressure in the furnace is ≤30Pa, the initial charge is 48% of the total industrial pure iron and carbon particles, and the melting speed is 0.5-1kg / min. After the initial charge is completely melted and lasted for 5 minutes, Al particles are added. After the Al particles are completely melted, the content is 0.2% (wt.). The Al melting process maintains a high power of 130kW within 3 minutes to the end of full melting.
[0022] (2) Refining stage: After the initial melting, the remaining carbon particles are added to enter the refining stage. The refining temperature is 1280-1300°C, the refining time is 14 min, and the refining vacuum is 50-60 Pa...
Embodiment 2
[0028] The target composition requirements of high manganese, high aluminum, high titanium and high boron steel are: C 0.12% (wt.), Mn 6.5% (wt.), Ti 8.5% (wt.), Al 5% (wt.), B 4 % (Wt.), the balance is Fe and unavoidable impurity elements.
[0029] (1) Initial melting stage: The entire initial melting stage is carried out under vacuum conditions, the pressure in the furnace is ≤30Pa, the initial charge is 51% of the total industrial pure iron and carbon particles, and the melting speed is 0.5-1kg / min. After the initial charge is completely melted and lasted for 5 minutes, Al particles are added. After the Al particles are completely melted, the content is 0.2% (wt.). The Al melting process maintains a high power of 130kW within 3 minutes to the end of full melting.
[0030] (2) Refining stage: After the initial melting, add the remaining carbon particles to enter the refining stage, the refining temperature is 1260-1880°C, the refining time is 14min, and the refining vacuum is 50-...
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Abstract
The invention discloses a vacuum smelting process for high-manganese high-aluminum high-titanium steel. The whole process mainly comprises a primary smelting stage, a refining stage, an alloying stageand an electrified pouring stage. Carbon particles are added at the primary smelting stage, melting speed is defined, a little Al is added, large-power stirring is performed, and dissolved oxygen inmolten steel is reduced; an adding sequence, a melting rate, a molten steel temperature and heat preservation time of the alloy are combined with in-furnace pressure, a smelting rate, a molten steel temperature and heat preservation time of the alloying stage, so that minimal volatility of Mn and component uniformity of molten steel can be guaranteed. The vacuum smelting process solves manganese,aluminum and titanium oxidization loss, in a production process, of the high-manganese high-aluminum high-titanium steel, and achieves the purpose of precisely controlling chemical components of the high-manganese high-aluminum high-titanium steel. According to the smelting process disclosed by the invention, the Mn yield can be 93% or higher, and the yield of Al and Ti can be 97% or higher.
Description
Technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a vacuum smelting process of high manganese, high aluminum and high titanium steel. Background technique [0002] In pilot production, vacuum induction furnace is often used as the main melting equipment. Because Mn has strong volatilization and easy oxidation, Al and Ti have strong oxidation. Therefore, when high-manganese, high-aluminum, high-titanium steel is vacuum-melted, the combination of Mn, Al and Ti Control is a difficult point. At present, the prior art introduces a method for controlling one or two of these three elements during vacuum induction smelting. Patent CN108715971A discloses an iron-chromium-aluminum alloy vacuum smelting process, which only introduces Al and Ti. Element control method, and the content of Ti element is low. [0003] In order to improve the comprehensive yield of Mn, Al, and Ti during vacuum melting of high manganese, high aluminum a...
Claims
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