Method for smelting stainless steel by top and bottom combined blown converter
A top-bottom combined blowing and converter smelting technology, which is applied in the field of top-bottom combined blowing converter smelting stainless steel, can solve the problems of complex stainless steel production process, high production cost and inflexible process of top-bottom combined blowing converter
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Embodiment 1
[0038] Smelted stainless steel: 0Cr18Ni9
[0039] The requirements for smelting raw materials and smelting furnaces are as follows:
[0040] Top-bottom combined blown converter is adopted, the volume of the furnace is 75t, and the maximum flow rate of top-blown oxygen is 200m 3 / min; the maximum flow rate of bottom blowing gas is 60m 3 / min.
[0041] The steps of this embodiment are as follows:
[0042] Time Processing content
[0043] 10:27 55 tons of pretreated molten iron was mixed into the top-bottom combined blowing converter, and the temperature of the molten iron was 1345°C.
[0044] 10:29 Sampling and analysis of molten iron (10:35 analysis results), the molten iron contains:
[0045] C Si Mn P S
[0046]4.05% 0.09% 0.05% 0.015% 0.03%
[0047] 10:29 Oxygen blowing at the top oxygen lance, oxygen blowing at the bottom of the furnace, nitrogen blowing smelting, top lance blowing gas and flow: O 2 =180m 3 / min; the height of the gun position is 2.1m; the bottom b...
Embodiment 2
[0068] Smelted stainless steel: 0Cr18Ni9
[0069] The requirements for smelting raw materials and smelting furnaces are as follows:
[0070] Top-bottom combined blown converter is adopted, the volume of the furnace is 75t, and the maximum flow rate of top-blown oxygen is 200m 3 / min; the maximum flow rate of bottom blowing gas is 60m 3 / min.
[0071] The steps of this embodiment are as follows:
[0072] Time Processing content
[0073] 9:23 55 tons of pretreated molten iron was mixed into the top-bottom combined blowing converter, and the temperature of the molten iron was 1345°C.
[0074] 9:25 Sampling and analysis of molten iron (9:27 analysis results) contained in molten iron:
[0075] C Si Mn P S
[0076] 4.05% 0.01% 0.01% 0.013% 0.039%
[0077] 9:26 Top-to-bottom compound blowing. Top gun blowing gas and flow: O 2 =180m 3 / min; gun position
[0078] Height 2.1m; bottom blowing gas and flow rate is O 2 :N 2 =15:25m 3 / min.
[0079] 9:26 Add 4988kg of high ca...
Embodiment 3
[0098] Smelted stainless steel: 2Cr13
[0099] The requirements for smelting raw materials and smelting furnaces are as follows:
[0100] Top-bottom combined blown converter is adopted, the volume of the furnace is 75t, and the maximum flow rate of top-blown oxygen is 200m 3 / min; the maximum flow rate of bottom blowing gas is 60m 3 / min.
[0101] The steps of this embodiment are as follows:
[0102] Time Processing content
[0103] 11:55 64.5 tons of pretreated molten iron was mixed into the top-bottom combined blowing converter, and the temperature of the molten iron was 1200°C.
[0104] 11:56 Sampling and analysis of molten iron (analysis results at 12:00) contained in molten iron:
[0105] C Si Mn P S
[0106] 4.2% 0.01% 0.01% 0.014% 0.02%
[0107] 11:56 Add 2325kg of coke particles.
[0108] 11:56 Top-to-bottom compound blowing. Top gun blowing gas and flow: O 2 =180m 3 / min; the height of the gun position is 2.1m; the bottom blowing gas and the flow rate are O...
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