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A method for smelting stainless steel by blowing hydrogen in an aod furnace

A technology of stainless steel and smelting process, which is applied in steel smelting. In the field of AOD furnace hydrogen blowing smelting stainless steel, it can solve the problems of large amount of alloy raw materials, inability to reduce manganese in slag, and high cost of alloying, so as to reduce toxicity and inhibit chromium. Oxidation, the effect of improving the yield of chromium

Active Publication Date: 2022-05-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the smelting process of stainless steel, due to the easy oxidation of alloying elements in the steel and the large amount of various alloy raw materials added in the smelting process, the temperature drop of molten iron during the smelting process is relatively large, which in turn leads to a large amount of oxidation of alloying elements in the smelting process, and the production cost is high.
[0004] Patent document CN103468874A discloses a method of smelting stainless steel by using an oxygen hydrogen furnace. In the later stage of smelting, electrolytic manganese or metal manganese is used to alloy manganese, which cannot reduce the manganese in the slag, and the cost of alloying is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Add 51 tons of molten iron into the 80-ton AOD furnace, the temperature of the molten iron is 1320°C, the carbon content of the molten iron is 4.06%, the nickel content is 6.628%, and the chromium content is 2.267%; the top lance is used to blow oxygen, and the flow rate is 4500Nm 3 / h, side gun blowing hydrogen, the flow rate is 4000Nm 3 / h, add 26.5 tons of high-carbon ferrochromium, 11.8 tons of ferronickel, blowing for 40 minutes, the temperature of molten iron reaches 1543 ° C, the carbon content is 2.45%, the nickel content is 7.9%, and the chromium content is 18.01%. Change to the top gun and side gun for simultaneous oxygen blowing and decarburization, the top gun is 4500Nm 3 / h, side gun 4000Nm 3 / h, continue blowing for 20 minutes; the top gun is changed to blowing hydrogen, and the side gun is blown into O 2 + Ar for mixed blowing, the oxygen flow rate is 4000Nm 3 / h gradually decreased to 1500Nm 3 / h, argon gas flow rate is 1000Nm 3 / h gradually increas...

example 2

[0022] Add 51 tons of molten iron to the 80-ton AOD furnace, the temperature of the molten iron is 1313°C, the carbon content of the molten iron is 4.29%, the nickel content is 5.138%, and the chromium content is 2.729%; the top gun is used to blow hydrogen, and the flow rate is 4000Nm 3 / h, side gun blowing oxygen, the flow rate is 4500Nm 3 / h, add 26.05 tons of high-carbon ferrochrome, 10.3 tons of ferronickel, blowing for 38 minutes, the temperature of molten iron reaches 1531 °C, the carbon content is 2.82%, the nickel content is 8.21%, and the chromium content is 18.22%. Change to the top gun and side gun for simultaneous oxygen blowing and decarburization, the top gun is 4500Nm 3 / h, side gun 4000Nm 3 / h, continue blowing for 20 minutes; the top gun is changed to blowing hydrogen, and the side gun is blown into O 2 + Ar for mixed blowing, the oxygen flow rate is 4000Nm 3 / h gradually decreased to 1500Nm 3 / h, argon gas flow rate is 1000Nm 3 / h gradually increased to ...

example 3

[0024] Add 46 tons of molten iron to the 80-ton AOD furnace. The temperature of the molten iron is 1336°C. The carbon content of the molten iron is 4.52%, the nickel content is 5.65%, and the chromium content is 2.847%. 3 / h, side gun blowing oxygen, the flow rate is 4500Nm 3 / h, add 27.02 tons of high-carbon ferrochrome and 14.6 tons of ferronickel, blow for 52 minutes, the temperature of molten iron reaches 1537 °C, and no carbon sample is obtained. Change to the top gun and side gun for simultaneous oxygen blowing and decarburization, the top gun is 4500Nm 3 / h, side gun 4000Nm 3 / h, continue blowing for 23 minutes; the top gun is changed to blowing hydrogen, and the side gun is blown into O 2 + Ar for mixed blowing, the oxygen flow rate is 4000Nm 3 / h gradually decreased to 1500Nm 3 / h, argon gas flow rate is 1000Nm 3 / h gradually increased to 4500Nm 3 / h, blowing for 31 minutes; at this time, the temperature of molten steel is 1692°C, the carbon content is 0.056%, t...

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Abstract

The invention discloses a method for smelting stainless steel by blowing hydrogen in an AOD furnace, belonging to the field of iron and steel metallurgy. When using AOD to smelt stainless steel, the method of top lance oxygen blowing + side lance hydrogen blowing or top lance hydrogen blowing + side lance oxygen blowing is used to deliver heat to the molten iron in the furnace during the decarburization period, so that the temperature of the molten iron in the furnace can quickly reach the preset temperature , to reduce the oxidation of chromium; at the same time, hydrogen can reduce the slag during the decarburization period, reducing the cost of reducing the alloy; during the reduction period, hydrogen is used instead of argon to reduce the cost of argon blowing; and hydrogen can reduce the slag, reducing the cost of reducing the alloy; while improving the end point Tapping temperature. The invention uses hydrogen blowing to smelt stainless steel, which can reduce the cost of smelting alloys, and at the same time, the hydrogen reaction product is water, which has a positive effect on alleviating the greenhouse effect.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a method for smelting steel, in particular to a method for smelting stainless steel by blowing hydrogen in an AOD furnace. Background technique [0002] Hydrogen energy is regarded as the clean energy with the most development potential in the 21st century. Due to its many advantages such as diverse sources, clean and low-carbon, flexible and efficient, and rich application scenarios, it has been included in the national energy strategic deployment of many countries. [0003] Stainless steel is one of the important materials widely used in modern industrial production. It is widely used in ultra-low temperature storage and transportation, automobiles, railways, construction materials, mining wear-resistant parts, large mill linings and metallurgy and other industries. However, during the smelting process of stainless steel, since the alloying elements in the steel are easil...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/068
CPCC21C7/00C21C7/0685Y02P10/20
Inventor 何杨徐浩刘建华张杰闫柏军邓振强
Owner UNIV OF SCI & TECH BEIJING
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