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A method for smelting ultra-pure ferritic stainless steel

A smelting method and stainless steel technology, applied in the direction of improving process efficiency, can solve the problem that the performance of pure ferritic stainless steel cannot meet the demand, and achieve the effect of shortening oxidation time, preventing intergranular corrosion, and improving high temperature corrosion resistance.

Active Publication Date: 2022-01-28
ANHUI FUKAI STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for smelting ultra-pure ferritic stainless steel to solve the technical problem that the properties of pure ferritic stainless steel cannot meet the requirements in the prior art

Method used

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  • A method for smelting ultra-pure ferritic stainless steel
  • A method for smelting ultra-pure ferritic stainless steel
  • A method for smelting ultra-pure ferritic stainless steel

Examples

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Embodiment 1

[0033] combine Figure 1-3, this embodiment provides a high-efficiency smelting device for alloy steel, including two vacuum tanks 1 and a base 2, the two vacuum tanks 1 and the base 2 are distributed in an isosceles right-angled triangle structure on the horizontal plane, and the base 2 is in an isosceles At the position of the right-angle point in the right-angled triangle structure, the top of the base 2 is fixed with a rotating device 3. The rotating device 3 can be a turntable structure driven by a motor through gear meshing. It only needs to be able to drive the equipment on it to rotate. ; the top of the rotating device 3 is fixedly installed with a vertical support structure 4 (for structures such as struts), and the top of the vertical support structure 4 is connected with the first horizontal support structure 5 perpendicular to it (in this embodiment, specifically One end of the horizontal plate), and the other end of the first horizontal support structure 5 is hung...

Embodiment 2

[0042] The purpose of this embodiment is to provide a method for smelting ultra-pure ferritic stainless steel so that the C+N content does not exceed 0.015%, and at the same time add appropriate Mo or Ti or Nb or a variety of combinations thereof to achieve the material Various properties required. C+N≤0.015%, can reduce the retained austenite content in the material; Ti and Nb elements can solidify C and N in the material, and Ti and Nb can improve the high temperature corrosion resistance of the material and prevent the material from being exposed to high temperature conditions Intergranular corrosion occurs under the environment; Mo element helps to improve the acid and alkali corrosion resistance of the material, especially the resistance to pitting corrosion.

[0043] Specifically, this embodiment provides that the composition of the ultra-pure ferritic stainless steel element mass percentage is: Si≤1.00%, Mn≤1.00%, P≤0.040%, S≤0.030%, Cr: 10.00%-32.50%, Ni : 0~1.00%, C+...

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Abstract

The invention discloses a method for smelting ultra-pure ferritic stainless steel, which relates to the technical field of metal smelting, and adopts two vacuum tanks, a base, a rotating device, multiple supporting structures, a ladle water-cooled furnace cover, multiple driving devices, and vacuum pumping The gas device, guide rail, frame guide rail car, etc. constitute a circulation system, which realizes the process integration of LF furnace and VD vacuum furnace, and uses the integrated equipment to process pure ferritic stainless steel, and controls tapping during the electric arc furnace melting process C and Si content, effective removal of C in the AOD furnace and other operations have achieved the goal of C+N content ≤ 0.015%. At the same time, adding Mo or Ti or Nb or various combinations thereof to pure ferritic stainless steel, Can effectively meet a variety of performance requirements.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a method for smelting ultra-pure ferritic stainless steel. Background technique [0002] Ferritic stainless steel is mainly used in automobile exhaust systems, and its Cr content is generally 12% to 30%. It has better stress corrosion resistance and high temperature oxidation resistance than austenitic stainless steel. Among ferritic stainless steel materials It is inevitable and contains a small amount of C and N elements. C and N elements are strong austenite-forming elements, which will cause some residual austenite structures in the material, resulting in a decrease in impact toughness and an increase in brittleness. The application in production has been restricted. Very restrictive. [0003] In recent years, China's automobiles have entered the era of mass consumption, and the S content in China's fuel oil is relatively high, which causes corrosion of automobile exh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/44C22C38/48C22C38/50C22C38/02C22C38/04C21C7/10C21C7/072C21C7/076
CPCC22C33/04C22C38/44C22C38/48C22C38/50C22C38/02C22C38/04C21C7/10C21C7/072C21C7/076Y02P10/20
Inventor 吴振忠徐涛陈晶晶沈荣冯昊苏江鲜庚赵跃胜
Owner ANHUI FUKAI STAINLESS STEEL
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