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Method for producing stainless steel master liquid

A technology of stainless steel and mother liquor, applied in the direction of improving process efficiency, electric furnace, furnace, etc., can solve the problems of limited usage, large deviation of stainless steel mother liquor, long smelting time, etc., and achieve the effect of shortening production time

Active Publication Date: 2013-09-25
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to fluctuations in the price of pure nickel resources, cheap high-phosphorus chromium-nickel pig iron is used by more and more stainless steel companies as the main nickel resource to produce stainless steel. However, when using high-phosphorus chromium-nickel pig iron or other high-phosphorus nickel resources, it is necessary to Phosphorus-chromium-nickel pig iron is used after melting and dephosphorization. For the ordinary stainless steel smelting process EAF+AOD (+VOD), the single electric furnace uses a large amount of high-phosphorus chromium-nickel pig iron for a long time to smelt, and the stainless steel mother liquor produced has components such as P, The deviation of Cr etc. is large, so that the use of high-phosphorus chromium-nickel pig iron in the stainless steel production process has the following problems: (1) the amount of use is limited, and the high-phosphorus chromium-nickel pig iron only accounts for 28.6% of each ton of steel when the charge is fully cooled; ( 2) It is difficult to match the production rhythm of the whole process; (3) The quality of stainless steel produced is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The embodiment of this production stainless steel mother liquor is the smelting in two electric arc furnaces (EAF), and the nominal volume of each electric arc furnace is 160 tons, and it comprises following steps in sequence:

[0039] Ⅰ、 Put 5 tons of carbon steel scrap into the A electric arc furnace to pave the floor, put 160 tons of high-phosphorus chromium-nickel pig iron in the middle, and put 5 tons of carbon scrap steel into the upper layer to start the arc.

[0040] The mass percent of the composition of high-phosphorus chromium-nickel pig iron is:

[0041] C: 4.2%; Si: 1.4%; P: 0.095%; S: 0.063%; Ni: 7.8%; Cr: 3.1%;

[0042] The rest is Fe and unavoidable impurities.

[0043] The mass percent of the composition of charging carbon steel scrap is:

[0044] C: 0.18%; Si: ≤0.22%; Mn: 0.35%; P: ≤0.027%; S: ≤0.013%;

[0045] The rest is Fe and unavoidable impurities.

[0046] Ⅱ Power transmission melting, desiliconization, dephosphorization, after A electric...

Embodiment 2

[0062] The embodiment of this production stainless steel mother liquor is the smelting in two electric arc furnaces (EAF), and the nominal volume of each electric arc furnace is 160 tons, and it comprises following steps in sequence:

[0063] Ⅰ、 Put 5 tons of carbon steel scrap into the electric arc furnace A to pave the floor, put 130 tons of high-phosphorus chromium-nickel pig iron in the middle, and put 5 tons of carbon scrap steel into the upper layer to start the arc. The mass percent of the composition of high-phosphorus chromium-nickel pig iron is:

[0064]C: 4.2%; Si: 1.4%; P: 0.095%; S: 0.063%; Ni: 7.8%; Cr: 3.1%;

[0065] The rest is Fe and unavoidable impurities.

[0066] The mass percent of the composition of charging carbon steel scrap is:

[0067] C: 0.18%; Si: ≤0.22%; Mn: 0.35%; P: ≤0.027%; S: ≤0.013%;

[0068] The rest is Fe and unavoidable impurities.

[0069] Ⅱ Power transmission melting, desiliconization, dephosphorization, after 100 minutes of depho...

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PUM

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Abstract

g stainless steel master liquid, which adopts two electric arc furnaces for smelting. The method includes the following steps in sequence: (I) 4 to 6 tons of carbon steel scrap are loaded into the electric arc furnace A and spread on the floor, 130 to 162 tons of high-phosphorus chromium-nickel cast iron are loaded in the middle of the electric arc furnace A, 4 to 6 tons of carbon steel scrap are loaded in the upper layer of the electric arc furnace A, and arc is started; (II) electric melting, desiliconization and dephosphorization are carried out, and treatment is carried out in the electric arc furnace A for 100 to 140 minutes until P is less than or equal to 0.020 percent; and molten iron is poured into a ladle, and is poured into the electric arc furnace B in one step or two steps equally; (III) after the molten iron is poured into the electric arc furnace B in two steps, 48 plus or minus 3 tons of high-carbon ferrochromium and 45 plus or minus 3 tons of high-phosphorus chromium-nickel cast iron are added into the electric arc furnace B, or after the molten iron is poured into the electric arc furnace B in one step, 48 plus or minus 3 tons of high-carbon ferrochromium is added into the electric arc furnace B; (IV) after electricity is supplied for no less than 8 minutes, oxygen is blown to assist melting, 8 plus or minus 2 tons of lime is added, and after 60 plus or minus 5 minutes, the burden in the furnace is completely molten down. 300Kg to 500Kg of ferrosilicon is added for reduction, and after 8 plus or minus 3 minutes of reduction, the stainless steel master liquid is tapped. In the method for producing the stainless steel master liquid, the high-phosphorus chromium-nickel cast iron accounts for 66 to 74 percent per ton of steel.

Description

technical field [0001] The invention relates to a method for producing stainless steel mother liquor, that is, the furnace-feeding molten liquor when AOD smelts stainless steel. Background technique [0002] Due to fluctuations in the price of pure nickel resources, cheap high-phosphorus chromium-nickel pig iron is used by more and more stainless steel companies as the main nickel resource to produce stainless steel. However, when using high-phosphorus chromium-nickel pig iron or other high-phosphorus nickel resources, it is necessary to Phosphorus-chromium-nickel pig iron is used after melting and dephosphorization. For the ordinary stainless steel smelting process EAF+AOD (+VOD), the single electric furnace uses a large amount of high-phosphorus chromium-nickel pig iron for a long time to smelt, and the stainless steel mother liquor produced has components such as P, The deviation of Cr etc. is large, so that the use of high-phosphorus chromium-nickel pig iron in the stain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C5/52
CPCY02P10/20
Inventor 任选刘亮马俊鹏张增武王新录
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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