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Long continuous casting control method for titanium-containing austenitic stainless steel

A technology of austenitic stainless steel and a control method, which is applied in the field of stainless steel smelting, can solve the problems of the influence of stainless steel slab quality, increase production cost, and crystallize fish, so as to increase the number of continuous casting furnaces, reduce the scrap rate, and improve the The effect of recovery

Inactive Publication Date: 2016-02-17
GUANGDONG GUANGQING METAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Titanium can bring excellent properties to steel grades, but because titanium is easily combined with oxygen and nitrogen, if the control is not good during the smelting process, it is easy to cause oxidation and nitriding of titanium, and its products TiN, TiO 2 It is easy to cause nozzle "nodules" and "mold fish formation" during casting, forcing the continuous casting to be interrupted, making multi-furnace sub-long continuous casting extremely difficult, and short continuous casting production will greatly increase production costs; at the same time, due to the existence of inclusions , the quality of the stainless steel slab and the quality after rolling will also be affected
[0005] China invented "a continuous casting method for austenitic heat-resistant stainless steel", application number 200910227928.2 discloses a continuous casting method for austenitic heat-resistant stainless steel that eliminates longitudinal cracks in continuous casting slabs, austenitic stainless steel containing titanium The long continuous casting method has not been reported yet

Method used

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Experimental program
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Effect test

Embodiment 1

[0036] A kind of austenitic stainless steel, its chemical composition weight percent ratio is: C: 0.026%; Si: 0.59%; Mn: 1.32%; Cr: 17.16%; Ni: 9.08%; N: 0.0144%; Ti: 0.20% ; P: 0.032%; S: 0.0021%, the rest is Fe and unavoidable impurity elements.

[0037] A method for controlling long continuous casting of titanium-containing austenitic stainless steel, comprising the steps of:

[0038] 1. Increase the carbon content of the molten steel when tapping from the electric arc furnace. The carbon content of the tapping from the electric arc furnace is 3.13%, and the temperature of the molten steel blended into the AOD furnace is 1612°C;

[0039] 2. The whole process of AOD smelting with argon gas reduces the N content in molten steel, and the N content in AOD tapping: 69ppm;

[0040] 3. During the AOD reduction period, stir for 3 minutes after the input of ferrosilicon and fluorite, add 190Kg aluminum ingots for deep deoxidation, and stir for 5 minutes after the aluminum ingots are ...

Embodiment 2

[0049] A kind of austenitic stainless steel, its chemical composition weight percent ratio is: C: 0.034%; Si: 0.63%; Mn: 1.41%; Cr: 17.36%; Ni: 9.03%; N: 0.0139%; Ti: 0.24% ; P: 0.029%; S: 0.0029%, the rest is Fe and unavoidable impurity elements.

[0050] A method for controlling long continuous casting of titanium-containing austenitic stainless steel, comprising the steps of:

[0051] 1. Increase the carbon content of the molten steel when tapping from the electric arc furnace. The carbon content of the tapping from the electric arc furnace is 3.08%, and the temperature of the molten steel blended into the AOD furnace is 1623°C;

[0052] 2. The whole process of AOD smelting with argon gas reduces the N content in molten steel, and the N content in AOD tapping: 75ppm;

[0053] 3. During the AOD reduction period, stir for 3 minutes after the input of ferrosilicon and fluorite, add 164Kg aluminum ingots for deep deoxidation, and stir for 5 minutes after Al input to complete t...

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Abstract

The invention relates to a long continuous casting control method for titanium-containing austenitic stainless steel, and belongs to the technical field of stainless steel smelting. The control method comprises the steps of (1), after smelting of molten steel is completed in an electric-arc furnace, adding the molten steel into an AOD refining furnace for whole-process argon gas blowing type smelting; (2), after input of silicon iron and fluorite is completed during the reduction period, adding Al for deep deoxidization, carrying out reduction after stirring is completed and guaranteeing the tapping temperature; (3), after the molten steel subjected to AOD refining enters a ladle furnace, beginning to add titanium wires when the temperature is within the range from 1580 DEG C to 1590 DEG C and carrying out micro-stirring, wherein the addition amount of the titanium wires guarantees that the molten steel meets the requirement that titanium is greater than or equal to 6C; (4), carrying out tapping when the tapping compositions of the molten steel meet the standard requirements and guaranteeing the content of Ti*N and Ca / Al. According to the control method, the number of continuous casting furnaces is greatly increased by controlling O and N in the molten steel from AOD to the ladle furnace and restraining nozzle clogging material from the source, and the continuous casting length of production of stainless steel slabs with the section being 200mm*1530mm can be greater than 900 meters according to practical operation. The control method greatly lowers the smelting cost, lowers the rejection rate of casting blanks and the rejection rate after rolling and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a long continuous casting control method of titanium-containing austenitic stainless steel, in particular to a titanium-containing austenitic stainless steel capable of long continuous casting and a production method thereof, belonging to the technical field of stainless steel smelting. Background technique [0002] Austenitic stainless steel refers to stainless steel with austenitic structure at room temperature. It came out in Germany in 1913. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but its strength is low, and it is impossible to strengthen it through phase transformation. It can only be strengthened by cold working. Because of its comprehensive and good comprehensive performance, it is widely used in heavy industry, light industry, daily necessities industry, architectural decoration and other industries. more than 70% of the total. In addition to corrosion resistance to oxidizing ...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C21C7/068B22D11/18
Inventor 田伟光何丛珍刘光勇徐佳林李伟
Owner GUANGDONG GUANGQING METAL TECH
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