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Smelting method for ferrite stainless steel mother liquid

A smelting method and stainless steel technology, applied in the field of smelting ferritic stainless steel mother liquor, can solve the problems of high inclusion content of stainless steel scrap, high cost of stainless steel scrap, influence on the quality of molten steel, etc. The effect of improving oxygen utilization

Inactive Publication Date: 2008-03-26
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] A large amount of stainless steel scrap is needed, and the inclusion content of stainless steel scrap is high, which is easy to affect the quality of molten steel, and the cost of stainless steel scrap is relatively high;
[0013] In addition, the scrap steel should be energized until the scrap steel is basically melted, and then the dephosphorized hot metal is added. The slag is formed late in this process and the power consumption is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] See Table 1, add successively in material blue: 25wt% carbon steel scrap; 10wt% FeCr, wherein, contain chromium 62%;

[0038] Open the furnace cover, add dephosphorized molten iron: 65wt% in the electric furnace; after the dephosphorized molten iron is added, immediately add the ingredients in the above-mentioned material blue, and close the furnace cover;

[0039] The power consumption is 2.0Mwh. According to the addition of 8.5kg / t silicon, start to add ferrosilicon;

[0040] When the power consumption is 5.0Mwh, oxygen blowing starts, and the oxygen blowing flow rate is 1500Nm3 / h; when the power consumption reaches 8.0Mwh, the oxygen blowing flow rate is adjusted to 2500 Nm3 / h, and the total oxygen blowing volume is 10Nm3 / t;

[0041] When the power consumption is 7.0Mwh, start to add 3.0 tons of lime from the high-level silo;

[0042] When the power consumption is 16.0Mwh, start to spray toner;

[0043] When the power consumption is 15.0Mwh, start to add dolomite f...

Embodiment 2

[0048] See Table 1, successively add in the material blue: 35wt% of carbon steel scrap; 15wt% of FeCr, containing 62% of chromium;

[0049] Open the furnace cover, add dephosphorized molten iron: 50wt% in the electric furnace; after the dephosphorized molten iron is added, immediately add the ingredients in the above-mentioned material blue, and close the furnace cover;

[0050] The power consumption is 4.0Mwh. According to the addition of 10kg / t silicon, start to add ferrosilicon;

[0051] When the power consumption is 7.0Mwh, start oxygen blowing, and the oxygen blowing flow rate is 1500Nm3 / h; when the power consumption reaches 12.0Mwh, the oxygen blowing flow rate is adjusted to 2500 Nm3 / h, and pay attention to the oxygen blowing angle, the total oxygen blowing volume for one furnace is 9Nm3 / t (calculated according to the amount added);

[0052] Power consumption 8.5Mwh starts to add 3.0 tons of lime from the high-level silo;

[0053] When the power consumption is 20.0Mwh...

Embodiment 3

[0059] See Table 1, add successively in material blue: 15wt% carbon steel scrap; 15wt% FeCr (wherein, containing chromium 62%); 10wt% FeCr (wherein, containing chromium 50%);

[0060] Open the furnace cover, add dephosphorized molten iron: 59wt% in the electric furnace; after the dephosphorized molten iron is added, immediately add the ingredients in the above material blue, and close the furnace cover;

[0061] The power consumption is 3.0Mwh. According to the addition of 9.5kg / t silicon, start to add ferrosilicon;

[0062] When the power consumption is 6.0Mwh, start oxygen blowing, and the flow rate of oxygen blowing is 1500Nm3 / h; when the power consumption reaches 11.0Mwh, adjust the flow rate of oxygen blowing to 2500Nm3 / h, and pay attention to the angle of oxygen blowing, the total amount of oxygen blowing in one furnace (calculated according to the amount added ) is 9.0Nm3 / t;

[0063] Add 3.0 tons of lime from the high-level silo when the power consumption is 10.0Mwh; ...

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Abstract

The ferritic stainless steel mother liquid smelting process in the charge mixture mode of dephosphorized molten iron+waste carbon steel+ferrochromium includes the following steps: feeding dephosphorized molten iron, waste carbon steel and ferrochromium and powering on; adding ferrosilicon after powering for 2.0-4.0 Mwh; beginning oxygen blast after powering for 5.0-7.0 Mwh; regulating the oxygen flow rat to 2500 Nm3 / h and total oxygen amount to 9-10 Nm3 / t after power consumption reaches 8.0-12.0 Mwh; adding lime after power consumption reaches 7.0-10.0 Mwh; spraying carbon powder after power consumption reaches 16.0-20.0 Mwh; adding dolomite after power consumption reaches 15.0-18.0 Mwh; reducing after power consumption reaches 220-240 Kwh / t and the measured temperature reaches 1610 deg.c; and tapping after power consumption reaches 250-320 Kwh / t and the measured temperature reaches 1630-1660 deg.c. The present invention has low power consumption and other advantages.

Description

technical field [0001] The invention relates to a method for smelting ferritic stainless steel mother liquor, which belongs to the technology of smelting stainless steel in an electric furnace. Background technique [0002] In the prior art, there is a kind of smelting stainless steel by using dephosphorized hot metal. This technology mainly produces austenitic stainless steel. The smelting process is to first add scrap steel and electrify for a period of time, then add dephosphorized hot metal to continue electrifying smelting; the ingredients are: Stainless steel scrap plus dephosphorized hot metal plus alloy. [0003] Chinese Patent Publication No. CN 1796586A discloses a process for smelting stainless steel mother liquor in an electric furnace. The batching mode of the patent application is: dephosphorized molten iron + stainless steel scrap + chrome-nickel alloy; [0004] Smelting process: first add scrap steel and electrify until the scrap steel is basically melted, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/04
Inventor 祝方义池和冰施允茅卫东
Owner BAOSHAN IRON & STEEL CO LTD
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