Method for smelting austenite antirust steel through converter desilicication solution

An austenitic stainless steel and converter technology, applied in the field of iron and steel smelting, can solve the problems of increasing AOD smelting time, and achieve the effects of shortening smelting time, reducing Si content, and improving production efficiency

Inactive Publication Date: 2018-03-06
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art and solve the technical problem of increasing the AOD smelting time caused by the use of large quantities of cheap high-Si content ferrochrome in the intermediate frequency furnace or electric furnace in the prior art, the present invention provides a method for shortening the AOD smelting time and improving Method for smelting austenitic stainless steel from converter desiliconization melt with high production efficiency

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The grade of steel smelted in the present embodiment one is: 022Cr19Ni10.

[0017] a. The intermediate frequency furnace melts chrome-nickel alloy or ferrochrome into a premelt

[0018] The intermediate frequency furnace is equipped with 14.98 tons of high-carbon ferrochrome as a charge. The Cr content in this high-carbon ferrochrome is 50.5%, and the Si content is 3.7%.

[0019] Add 22.1 tons of grade II domestic high-carbon ferrochromium, the content of Cr in this high-carbon ferrochrome is 56.8%, Si=2.28%, add 7.4 tons of chromium-nickel pig iron, the content of Si in chromium-nickel pig iron is 3.4%, and the content of Cr is 2.32 %, Ni content is 8.576%. After smelting into premelt, the steel is tapped into the premelt ladle (premelt ladle number is UE8), and the amount of steel tapped is 44.48 tons. After being hoisted to the electric furnace, the mass percentage content of each element in the tapped steel is:

[0020] The C content is 7.81%, the Si content is 2....

Embodiment 2

[0034] The grade of steel smelted in the second embodiment is: 316L.

[0035] a. The intermediate frequency furnace melts chrome-nickel alloy or ferrochrome into a premelt

[0036] The intermediate frequency furnace is equipped with 15 tons of high-carbon ferrochrome, in which the Cr content is 52.5%, and the Si content is 4.87%; it is equipped with 23 tons of imported high-carbon ferrochrome, and in this high-carbon ferrochrome: Cr content The Si content is 69.1%, the Si content is 0.5%, and 7.55 tons of chrome-nickel pig iron is added. The Si content in the chrome-nickel pig iron is 2.46%, the Cr content is 2.3%, and the Ni content is 6.98%. After smelting into pre-melt, the steel is tapped into the pre-melt ladle (pre-melt ladle number UE8), and the steel output is 45.55 tons. After being hoisted to the electric furnace, the mass percentage of each element in the steel is: C content is 7.68%, The Si content is 1.16%, the Cr content is 52.56%, the Ni content is 2.24%, and t...

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Abstract

The invention relates to a method for smelting austenite antirust steel through a converter desilicication solution, belongs to the technical field of steel smelting, and solves the technical problemthat AOD smelting time is increased after a medium-frequency furnace or an electric furnace uses chromium iron with high Si content. According to the scheme adopted by the invention, the method comprises the following steps: a, filling a chromium-nickel alloy or chromium iron into the medium-frequency furnace to melt; b, filling waste steel or raw iron containing molybdenum, nickel and chromium into an electric furnace to smelt; c, mixing pre-melting solutions prepared in the step a and the step b, and transferring the mixed solution into a converter to blown by an oxygen lance, and lifting the lance when mass percentage content of Si in the pre-melting solution is 0.65%-0.75, blowing argon gas to the bottom of the medium converter in a blowing process for continuously stirring and reducing until mass percentage content of Si in the pre-melting solution is reduced to be lower than 0.50%; and d, mixing the pre-melting solutions in the step c into an AOD furnace to smelt, thereby preparing austenite antirust steel. The austenite antirust steel smelted by the method has a yield increased to be 0.25% or more, AOD smelting time is not increased, and the whole-line production efficiencyis obviously improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a method for smelting austenitic stainless steel, in particular to a method for smelting austenitic stainless steel from a converter desiliconization solution. Background technique [0002] At present, the smelting of austenitic stainless steel mainly uses electric furnace (or intermediate frequency furnace) to melt scrap steel, and then blows it in AOD furnace (AOD furnace, argon oxygen decarburization furnace, argon oxygen refining furnace; GOR converter, KOBMS converter, etc.) , alloying, such as the Chinese patent "Stainless Steel Smelting Method" (patent number: 200810187563.0), this method is a two-step smelting method; there is also a VOD process added behind the AOD furnace (GOR converter, KOBMS converter, etc.) to further reduce The carbon content in the steel, this method is called three-step smelting; and the third is the AOD furnace directly using molten...

Claims

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Application Information

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IPC IPC(8): C22C33/06C21C5/28C21C7/072
CPCC21C5/005C21C7/072C22C33/06Y02P10/20
Inventor 闫志伟陈景锋马骏鹏张增武杜晓建王伟周丰刘涛
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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