Corrosion-resistant 316L stainless steel, and manufacturing method and application thereof

Abstract

The invention provides corrosion-resistant 316L stainless steel, and a manufacturing method and application thereof. The corrosion-resistant 316L stainless steel comprises the following components bymass: no more than 0.02% of C, 0.3 to 0.5% of Si, 1.2 to 1.4% of Mn, 12.01 to 12.5% of Ni, 17.1 to 17.9% of Cr, 3.01 to 3.3% of Mo, no more than 0.04% of N, no more than 0.035% of P and no more than 0.02% of S, with the balance being Fe and unavoidable elements. The corrosion-resistant 316L stainless steel has a grain size of grade 7 to 9 and surface Vickers hardness of 150 to 180 HV.

Description

technical field [0001] The invention belongs to the field of iron and steel manufacturing, and relates to a corrosion-resistant 316L stainless steel and a manufacturing method and application thereof. Background technique [0002] Mo-containing austenitic stainless steel represented by ASTM316L has excellent comprehensive properties such as corrosion resistance, weldability and processability, making this product widely used. [0003] Most of the existing 316L on the market is produced according to American Standard. For cost considerations, steel mills generally lower the Ni content of products to the lower limit as much as possible. The American Standard stipulates that the Ni content of 316L is 10-14%, while the Japanese Standard stipulates that the Ni content of 316L is 12-15%. According to the minimum standard, there is a 2% difference in Ni content between the American Standard and the Japanese Standard, which is quite huge in terms of price. The Mo content of 316L m...

AI Technical Summary

Problems solved by technology

The working environment of the dyeing machine is relatively complicated. During the use of the printing and dyeing machine, there will be a number of hooks on the edge of the cloth that collide with the wall of the dyeing vat during operation, forming mechanical damage and the starting point of corrosion. For different textiles and Various dyes need to be used. In order to improve the quality of printing and dyeing, it is often necessary to add additives to the dyeing solution, which makes the composition of the dyeing solution more complex, which contains chloride ions that are corrosive to austenitic stainless steel, especially in recent years. After the implementation of policies and processes such as upgrading and reuse of reclaimed water, the concentration of chloride ions in the solution has generally increased, and a new printing and dyeing machine has been put into use, ranging from half a year to a year. yarn problem

If it continues to be used, it will lead to aggravated pitting and stress corrosion damage of the printing and dyeing machine, and eventually cause a sudden explosion of the dyeing vat, causing huge losses and casualties

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