Method for smelting austenite stainless steel by using dephosphorized molten iron
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
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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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