Method for smelting austenite stainless steel by using dephosphorized molten iron
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A technology for austenitic stainless steel and dephosphorized molten iron, which is applied in the field of smelting austenitic stainless steel with dephosphorized molten iron, can solve the problems of low operation rate of stainless steel converter, long smelting cycle, and long time, so as to shorten the smelting time and shorten the smelting cycle , the effect of reducing phosphorus content
Active Publication Date: 2013-11-13
SHANXI TAIGANG STAINLESS STEEL CO LTD
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Problems solved by technology
However, when dephosphorizing hot metal is smelting stainless steel in the stainless steel converter, there are mainly problems in the process of adding too much solid cold material, and the stainless steel converter takes a long time to smelt austenite, resulting in a long smelting cycle, high consumption, and low operation rate of the stainless steel converter.
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Embodiment 1
[0031] The type of steel smelted in this embodiment is SUS304.
[0032] This embodiment includes the following steps in sequence:
[0033] Ⅰ Melting nickel base alloy into pre-solution in medium frequency induction furnace
[0034] The capacity of the intermediate frequency induction furnace is 35t, and the nickel-based alloy added is 30t of chromium-nickel pig iron. The mass percentage of Ni and P in the composition is:
[0035] Ni=12.0%, P=0.021%;
[0036] The induction tapping temperature of the intermediate frequency furnace is 1628°C, and the tapping amount is 30t;
[0037] Ⅱ Hot metal pretreatment to provide dephosphorized hot metal
[0038] The mass percent of C and P in the composition of dephosphorized hot metal is:
[0039] C=3.2%, P=0.007%;
[0040] The temperature of molten iron after treatment is 1320°C, and the amount of iron tapping is 38t;
[0041] Ⅲ Dephosphorized hot metal and pre-solution are mixed into KOBMS for blowing
[0042] The pre-solutio...
Embodiment 2
[0057] The type of steel smelted in this embodiment is 316L.
[0058] This embodiment includes the following steps in sequence:
[0059] Ⅰ Medium frequency induction furnace melting nickel base alloy into pre-solution
[0060] The capacity of the intermediate frequency furnace is 35t, and the nickel-based alloy used is nickel-iron, and the mass percentage of its composition is:
[0061] Ni=40%, P=0.019%;
[0062] The rest are unavoidable impurities;
[0063] The tapping temperature of the intermediate frequency furnace is 1637°C, and the tapping amount is 30t;
[0064] Ⅱ Hot metal pretreatment to provide dephosphorized hot metal
[0065] The mass percent of C and P in the composition of dephosphorized hot metal is:
[0066] C=3.22%, P=0.005%;
[0067] The temperature of molten iron after treatment is 1332°C, and the amount of iron tapping is 31t;
[0068] Ⅲ Dephosphorized molten iron and pre-solution are mixed into KOBMS for blowing
[0069] The pre-solution melted by ...
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Abstract
The invention relates to a method for smelting austenite stainless steel by using dephosphorized molten iron. The method comprises the following steps of: (I) melting nickel-base alloy into a pre-solution by using a medium-frequency induction furnace, wherein the mass percentage of Ni in the nickel-base alloy is 4-99.5%, and the mass percentage of P in the nickel-base alloy is not higher than 0.045%; (II) pretreating molten iron so as to provide the dephosphorized molten iron, wherein the mass percentage of C in the dephosphorized molten iron is 2.5-4.0%, and the mass percentage of P in the dephosphorized molten iron is not higher than 0.01%; (III) blending the dephosphorized molten iron and the pre-solution with KOBMS and blowing, wherein the nickel-base alloy melted by the medium-frequency induction furnace and the dephosphorized molten iron are mixed, then are blended into the KOBMS and are subjected to oxygen-blowing decarburization melting in the KOBMS; (IV) carrying out VOD blowing and adjusting ingredients, wherein a VOD carries out blowing according to ingredients of outlet steel of the KOBMS and carries out alloying adjustment according to ingredients of steel types; and (V) carrying out LF refining, wherein an LF adjusts the ingredients and adjusts temperature to a target outbound temperature. The method for smelting the austenite stainless steel by using the dephosphorized molten iron has the advantages that the austenite smelting time of a stainless steel converter is shortened, and the operating efficiency of the stainless steel converter is increased.
Description
technical field [0001] The invention relates to a method for smelting austenitic stainless steel with dephosphorized molten iron. Background technique [0002] Using electric energy to melt stainless steel raw materials is the main method of smelting austenitic stainless steel, and using dephosphorized molten iron to smelt stainless steel is another major technology developed in recent years. Its main feature is to use blast furnace molten iron to smelt stainless steel in a stainless converter after dephosphorization . However, when dephosphorizing hot metal is smelted stainless steel in the stainless steel converter, the main problem is that the addition of solid cold material is too large, and the stainless steel converter takes a long time to smelt austenite, resulting in a long smelting cycle, high consumption, and low operation rate of the stainless steel converter. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the existi...
Claims
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