Stainless steel seamless steel tube for sulfuric acid waste heat recovery device

Abstract

The invention relates to a stainless steel seamless steel tube for a sulfuric acid waste heat recovery device. The stainless steel seamless steel tube comprises the following components: 0.05-0.06 percent of C, 1.5-2.0 percent of Mn, 19.0-22.0 percent of Ni, 24.0-26.0 percent of Cr, 0.45-0.60 percent of Nb, 0.4-0.6 percent of Si, 0.1-0.15 percent of N, less than or equal to 0.2 percent of Cu, less than or equal to 0.015 percent of s, less than or equal to 0.025 percent of p, 0.3-0.5 percent of Mo, 2-4 percent of Al, 0.4-0.6 percent of Ti, 0.0018-00022 percent of v, 0.5-0.8 percent of composite rare earth and the balance of Fe. According to the operations of limiting the components and technological parameters, adding the composite rare earth and performing bright heat treatment on pure nitrogen protective gas, the stainless steel tube has excellent corrosion resistance, low roughness of inner and outer surfaces, high yield strength and high tensile strength.

Description

technical field [0001] The invention relates to a stainless steel seamless steel pipe, in particular to a stainless steel seamless steel pipe used in a sulfuric acid waste heat recovery device. Background technique [0002] Stainless steel seamless steel pipe is a common metallurgical metal product. Seamless steel pipe is a round, square, and rectangular steel with a hollow section and no seams around it. Seamless steel pipes are made of steel ingots or solid tube blanks, and then made by hot rolling, cold rolling or cold drawing. Seamless steel pipes have hollow sections and are used in large quantities as pipes for conveying fluids. At present, the steel pipes used in sulfuric acid waste heat reflux devices on the market, ordinary carbon steel does not have corrosion resistance at all, and generally only takes a few months to corrode and perforate. Although austenitic stainless steel 310S has better resistance to pitting and pitting corrosion And uniform corrosion perfor...

AI Technical Summary

Problems solved by technology

At present, the steel pipes used in sulfuric acid waste heat reflux devices on the market, ordinary carbon steel does not have corrosion resistance at all, and generally only takes a few months to corrode and perforate. Although austenitic stainless steel 310S has better resistance to pitting and pitting corrosion and uniform corrosion performance, but the use in this environment is limited due to the poor stress corrosion resistance of austenitic stainless steel

Due to its special environmental requirements, it must have good corrosion resistance, pitting corrosion resistance, high temperature resistance and stress resistance. Although ordinary steel pipes can basically meet the requirements, the overall performance is not ideal, and pitting corrosion and grain boundaries are prone to occur. Corrosion reduces the mechanical strength and elongation of the steel pipe, making the service life of the steel pipe shorter and more expensive