Grain boundary engineering technique for improving corrosion resistance of 316Lmod stainless steel

Abstract

The invention discloses a grain boundary engineering technique for improving the corrosion resistance of 316Lmod stainless steel. The grain boundary engineering technique for improving the corrosion resistance of the 316Lmod stainless steel comprises the steps that heat preservation is conducted on the 316Lmod stainless steel at the temperature of 1050-1150 DEG C for 5-60 min; machining deformation with the deformation quantity being 3%-15% is conducted at the indoor temperature after water cooling; then annealing is conducted at the temperature of 1020-1150 DEG C for 3-12 min; and finally, the 316Lmod stainless steel with high corrosion resistance can be obtained after water cooling. According to the grain boundary engineering technique for improving the corrosion resistance of the 316Lmod stainless steel, the low sigma CSL grain boundary of the 316Lmod stainless steel can be improved remarkably; the components of materials do not need to be changed, and compared with an existing similar technique, long-time annealing is not needed, repeated machining and repeated annealing are not needed either, the technique is simpler, and operation is easy; the technique can also be referred and used for other several low-stacking fault energy face-centered cubic metal materials, cost control in industrial production is facilitated, popularization is easy, and extremely remarkable economic benefits are achieved.

Description

technical field [0001] The invention relates to a process method for improving the corrosion resistance of alloy materials, in particular to a grain boundary engineering process method for stainless steel materials, which is applied to the technical field of deformation and heat treatment processes of metal materials. Background technique [0002] 316Lmod stainless steel is a kind of urea-grade stainless steel specially used in the manufacture of urea production equipment. It is an improved version of 316L stainless steel. 316L stainless steel has better corrosion resistance. In the urea production medium and nitric acid solution medium, the main reason for the intergranular corrosion of 316Lmod stainless steel is that impurity elements such as phosphorus and silicon in the material segregate at the grain boundary, resulting in the potential difference between the grain boundary and the internal corrosion electrolyte solution, and The main reason for the intergranular corro...

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Problems solved by technology

However, the first process requires long-time annealing, and the second process requires repeated cold working and annealing. These two processes are not conducive to cost control in industrial production.

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