Preparation method of high-strength and corrosion-resistant composite heat exchanger tube

Abstract

The invention discloses a preparation method of a high-strength and corrosion-resistant composite heat exchanger tube. The composite heat exchanger tube consists of a copper base, alloy metal and filling particles, wherein the alloy metal comprises the following components in percentage by weight: 0.5-0.6% of magnesium, 0.08-0.09% of silver, 0.2-0.4% of tin, 0.012-0.014% of zirconium, 0.012-0.014% of niobium, 0.05-0.06% of nickel, 0.005-0.008% of titanium and 0.02-0.04% of mixed rare earth; the mixed rare earth consists of yttrium, berkelium and lanthanum at a mass ratio of 1: (0.15-0.2): (0.4-0.5); and the filling particles comprise the following components in percentage by weight: 0.010-0.012% of tetrapod-like zinc oxide whiskers, 0.008-0.009% of silicon carbide, 0.005-0.006% of aramid fiber, 0.004-0.005% of glass fiber and 0.002-0.003% of nano titanium oxide. The oxygen content of the prepared composite heat exchanger tube is in an oxygen-free copper level; the crystal grain is tiny; and the mechanical strength, the high-temperature resistance, the corrosion resistance and the wear resistance are improved greatly compared with the existing copper tube.

Description

technical field [0001] The invention relates to the field of heat exchange equipment, in particular to a method for preparing a high-strength corrosion-resistant composite heat exchange tube. Background technique [0002] At present, with the development of power stations, ships, and refrigeration industries, it is necessary to find a heat exchange tube material with good corrosion resistance and processing performance. The original heat exchange tubes were mostly brass tubes, high nickel white copper tubes or red copper tubes. However, brass tubes, high-nickel white copper tubes and red copper tubes all have their shortcomings, which are described as follows: brass tubes are relatively low in cost, but their corrosion resistance and processing performance are not as good as those of white copper tubes. Generally, it takes about three years Repair and replace a batch. The maintenance cost of power station and ship shutdown is high, and the refrigeration shutdown maintenanc...

AI Technical Summary

Problems solved by technology

The disadvantages are: (1) The production process is complicated, there are many auxiliary facilities, the maintenance cost of the mold is high, the floor area is large, and the personnel requirements are high-quality; (2) The investment scale is large, ranging from hundreds of millions to hundreds of millions. (3) The secondary heating of the round billet requires extrusion molding, extruding cylinders, needles, and high energy consumption such as preheating before work; (4) Stirring, ingot casting, sawing, heating, pressing, peeling, acid Washing and other processes have large metal loss, low yield, and the yield of billet supply is less than 90%; (5) semi-continuous casting with single furnace or split furnace casting is used, which has poor production continuity and low efficiency; (6) zinc burning loss is large, Stirring, secondary heating, extrusion and lubrication, etc. have a lot of smoke and serious pollution; (7) The eccentricity of the tube billet affects the subsequent cold processing, especially the extrusion yield of large-diameter thin-walled brass tubes in forward extrusion is 40%~ 60%