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A kind of production method of low magnetic permeability cold-rolled stainless steel strip

A technology of cold-rolled stainless steel and low magnetic permeability, applied in the field of stainless steel materials, can solve the problems of unsatisfactory stainless steel strip shape, affecting the surface quality of stainless steel strip, unable to meet the requirements of use, etc. Corrosion and combined mechanical properties, improved scratch resistance and chloride ion corrosion resistance

Active Publication Date: 2022-03-25
河北博远科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yield strength of austenitic stainless steel is low, and at the same time, the metastable austenite in the steel is prone to martensitic transformation after cold deformation, which reduces the low magnetic properties (relative magnetic permeability is above 1.05); in the existing production In technology, δ ferrite is prone to appear in single-phase austenitic stainless steel. When ferrite accumulates to a certain content, it will aggravate the crack tendency during hot working, and also lead to a decrease in pitting resistance, which greatly reduces the use of steel. performance
With the increase of application conditions in corrosive environments such as chemical industry, petroleum, papermaking, seawater treatment, etc., and the corrosion conditions are becoming more and more harsh, higher requirements are placed on the corrosion resistance of materials. Low magnetic permeability prepared by ordinary processes The high-rate austenitic stainless steel has been increasingly unable to meet its use requirements
In addition, the shape of the stainless steel strip produced by the existing technology is not ideal, and the roughness is relatively large, resulting in dull surface and low grade, and the large roughness will also affect the surface quality of the stainless steel strip at the same time, which needs further improvement

Method used

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  • A kind of production method of low magnetic permeability cold-rolled stainless steel strip
  • A kind of production method of low magnetic permeability cold-rolled stainless steel strip
  • A kind of production method of low magnetic permeability cold-rolled stainless steel strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A production method of a cold-rolled stainless steel strip with low magnetic permeability, comprising the following steps:

[0055] (1) Casting strip: The molten steel that meets the composition is continuously cast into a casting strip through a twin-roll thin strip, and a stainless steel strip billet with a thickness of 6.7mm is made;

[0056] (2) Coiling: the blank is cooled and coiled, the cooling rate is 50°C / s, and the coiling temperature is 450°C;

[0057] (3) Rough rolling: rough rolling the rolled stainless steel strip through a cold rolling mill: the tension at the entrance is 260KN, the tension at the exit is 620KN, the rolling force is 9650KN, and the rolling speed is 120m / min , the reduction ratio of rough rolling is 25%;

[0058] (4) One-time annealing: the billet after rough rolling is sent to the annealing furnace for annealing treatment, the outlet temperature of the annealing furnace is 800 ° C, and the oxygen volume concentration in the furnace is 6%...

Embodiment 2

[0066] A method for producing a cold-rolled stainless steel strip with low magnetic permeability, as an improvement of the scheme of Embodiment 1, the only difference in this embodiment is that the composition of the stainless steel strip also contains 0.03% and 0.04% by weight of Ru, respectively. and Sr.

Embodiment 3

[0068] A production method of cold-rolled stainless steel strip with low magnetic permeability, the difference between this embodiment and embodiment 1 is only that the step of annealing is not performed between rough rolling and finishing rolling, and the other steps are consistent to obtain stainless steel bring.

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Abstract

The invention provides a production method of low-permeability cold-rolled stainless steel strip, which belongs to the technical field of stainless steel materials. The rolling treatment of rough rolling and at least one finish rolling, the above rough rolling and finish rolling are cold rolling treatment; after the above rough rolling and finish rolling treatment, the obtained billet is respectively annealed; and hot drawing and leveling operation to obtain cold-rolled stainless steel strip with low magnetic permeability; the thickness of the finished stainless steel strip is 0.2-5.0mm, and the relative magnetic permeability is ≤1.000. The method provided by the invention can reduce the surface roughness of the material, improve scratch resistance and chloride ion corrosion resistance, prolong the service life of the material, and reduce production energy consumption; the relative magnetic permeability of the finished product is ≤1.000, and the thickness can reach 0.5-5.0mm. Overcome the problem of high chloride ion corrosion.

Description

technical field [0001] The invention belongs to the technical field of stainless steel materials, and in particular relates to a production method of a cold-rolled stainless steel strip with low magnetic permeability. Background technique [0002] Stainless steel has the characteristics of good corrosion resistance, high temperature resistance, high strength and toughness, beautiful appearance and excellent processability, and is widely used in food machinery, sanitary facilities, kitchens, building decoration, automobiles, chemicals and electrical products. One of the most widely used stainless steel materials is stainless steel strip, which is an extension of ultra-thin stainless steel plate. It is mainly a narrow and long steel plate produced to meet the needs of industrial production of various metal or mechanical products in different industrial sectors. Widely used in high-tech industries, IT industries, and aviation and aerospace industries, with high added value. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/06C21D8/02C22C38/02C22C38/04C22C38/42C22C38/58
CPCB22D11/0622C21D8/0205C21D8/0226C21D8/0263C22C38/04C22C38/58C22C38/42C22C38/02C22C38/001C22C38/002
Inventor 付金录张航航
Owner 河北博远科技有限公司