A kind of annealing method of stainless steel strip

Abstract

The invention discloses an annealing method for stainless steel strips, which includes: (1) transferring the cold-rolled stainless steel strips to the heating section of the annealing furnace, and directly performing heat treatment on the stainless steel strips, so that the stainless steel strips are heated from 30°C to 1160°C, and the stainless steel strip is at a temperature above 1080°C for at least 15 seconds; (2) cooling the heated stainless steel strip to below 180°C through the air-cooling section; (3) cooling the air-cooled stainless steel strip through the water-cooling section to Below 70°C; (4) Pass the water-cooled stainless steel strip through a squeeze roller to remove moisture on the surface of the stainless steel strip; (5) Dry the stainless steel strip using the flue gas and waste heat generated in the heating zone. The invention simplifies the traditional annealing process, and the finished stainless steel strip has good mechanical properties, good flatness, uniform hardness, small roughness, bright and high-grade appearance.

Description

technical field [0001] The invention relates to the technical field of stainless steel, in particular to an annealing method for a stainless steel strip. Background technique [0002] Stainless steel strip 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. It is widely used in high-tech industries, IT industries, and Aviation and aerospace industries have high added value, but the rolling process is difficult to master, because internal stress will be generated inside the stainless steel strip after the initial rolling, which affects the effect of finishing rolling and has a great impact on the forming of the finished product. The finished products have different requirements on hardness, which increases the difficulty of the rolling process, the production efficiency is low, and the finished product rate is...

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Problems solved by technology

[0005] The above-mentioned annealing process requires precise control and is difficult to produce. The residual stress of the stainless steel strip can be removed through the above-mentioned annealing process. However, it only takes 20 seconds to preheat to 380°C, and the heating time of the strip steel from 380°C to 1130°C only 40s, and the cooling stage is also rapid cooling, so the mechanical properties of the stainless steel strip are not ideal, and its elongation is only 46-55%. In addition, the surface finish is Ra0.6-0.8, and the appearance is not bright enough.

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