Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for smelting ferritic stainless steel with charge ferrochromium

A stainless steel and ferrite technology, applied in the field of steelmaking, can solve the problems of restricting the batching structure of the charge, increase the smelting time, increase the cost, etc., and achieve the effects of reducing the production cost, improving the charging conditions and improving the production efficiency.

Active Publication Date: 2019-06-25
SHANXI TAIGANG STAINLESS STEEL CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that ferrochrome with high Si content should not be used in the AOD process or the front process, and cheap chromium waste should not be used in large quantities, otherwise it will lead to the increase of Si in the molten steel smelted by AOD or the increase of smelting time, which will directly affect the life of the AOD furnace. The burden structure of the smelting process is changed, which increases the cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Steel Type 430

[0009] ① The intermediate frequency furnace melts chrome waste and charge ferrochrome (6% by weight of Si) into a premelt, and the intermediate frequency furnace is equipped with 25t of charge ferrochrome. The content of C in this charge is 7.81% by weight and the content of Cr is It is 50.5%, Si weight percentage content is 6.1%, add chromium waste 15t, the C weight percentage content in the chromium waste is 0.039%, Cr weight percentage content is 12.3%, Si weight percentage content is 0.25%. After smelting into premelt, tap the steel into the premelt ladle (premelt ladle number UE12), the tapping amount is 40t, after hoisting to the electric furnace, the weight percentage content of each element in the tapping is: C=4.89%; Si =3.90%; Cr=36.17%; the rest is iron and unavoidable impurities.

[0010] ②The electric furnace melts chromium waste (or carbon steel scrap) into a pre-solution, which is mixed with the intermediate frequency furnace pre-melt. T...

Embodiment 2

[0015] Steel 1Cr13

[0016] ① The intermediate frequency furnace melts chrome waste and charge ferrochrome (6% by weight of Si) into a pre-melt, and the intermediate frequency furnace is equipped with 23t of charge ferrochrome. 50.1%, Si weight percent content is 6.8%, with chromium waste 12t, C weight percentage content in chromium waste is 0.041%, Cr weight percentage content is 2.1%, Si0 2 The weight percentage content is 27%. After smelting into premelt, tap the steel into the premelt ladle (premelt ladle number UE7), the tapping amount is 35t, after hoisting to the electric furnace, the weight percentage content of each element in the tapping is: C=5.09%; Si =4.56%; Cr=36.91%; the rest is iron and unavoidable impurities.

[0017] ② Melt chromium waste (or carbon steel scrap) into a pre-melt in an electric furnace and mix it with the pre-melt in an intermediate frequency furnace. The basicity of the slag in the electric furnace is 1.3. The electric furnace is equipped w...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of steel refining, and discloses a method for smelting ferrite stainless steel by using burden ferrochromium. The method is performed according to the following steps: (a) waste chromium and ferrochromium are added in a medium-frequency furnace for melting to obtain first pre-molten liquid; and the adding weight of the ferrochromium is 1.3-2.0 times of the weightof the waste chromium; (b) the waste chromium or a mixture of the waste chromium and carbon waste steel or added in an electric furnace for melting to obtain second pre-molten liquid; the obtained second pre-molten liquid is mixed with the first pre-molten liquid obtained in the step (a) to obtain third pre-molten liquid; and the weight of the second pre-molten liquid is 3-4 times of the weight of the first pre-molten liquid; (c) the mixed third pre-molten liquid is not slagged off, and is mixed in a converter for stirring and blowing; and the carbon waste steel is added in the process to form fourth pre-molten liquid; and (d) the fourth pre-molten liquid is mixed in an AOD furnace for smelting after blowing by the converter; and then, the tapping is performed. The method for smelting theferrite stainless steel not only can shorten the AOD smelting time, but also has the advantages of reducing the production cost and improving the production efficiency.

Description

technical field [0001] The invention relates to the field of steelmaking, and relates to a method for smelting ferritic stainless steel. Background technique [0002] At present, the smelting of ferritic stainless steel mainly uses AOD (GOR, KOBMS, etc.) Carbon content in steel. Its disadvantage is that it is not suitable to use ferrochrome with high Si content in AOD process or front process, nor can it use a large amount of cheap chromium waste, otherwise it will lead to the increase of Si in AOD smelted molten steel or the increase of smelting time, which will directly affect the life of AOD furnace, so it is restricted The burden structure of the smelting process is changed, which increases the cost. Contents of the invention [0003] The purpose of the present invention is to address the above disadvantages, to provide an intermediate frequency furnace or an electric furnace that can use cheap high-Si-content ferrochrome and chromium waste in large quantities, and a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/18C22C38/02C22C38/04
CPCC22C33/06C22C38/02C22C38/04C22C38/18
Inventor 闫志伟陈景锋张增武王伟周丰刘涛任选
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD