Preparation method of high-strength corrosion-resistant copper pipe for heat exchanger

Abstract

The invention discloses a preparation method of a high-strength corrosion-resistant copper pipe for a heat exchanger. The high-strength corrosion-resistant copper pipe comprises a copper matrix and alloy metals. The alloy metals comprise, 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 mischmetal. The mischmetal comprises yttrium, berkelium and lanthanum according to a mass ratio of 1: (0.15-0.2): (0.4-0.5). The preparation method utilizes upward continuous casting, rolling and drawing processes to replace casting, sawing, heating, extrusion and pickling processes of the traditional preparation method so that processes are greatly simplified, continuous production is realized, a period is short, and efficiency is high. A copper pipe prepared by the preparation method has oxygen content satisfying the oxygen-free copper level standard, has fine grains, and has mechanical strength, high temperature resistance, corrosion resistance and wear resistance obviously superior to the same performances of the existing copper pipe.

Description

technical field [0001] The invention relates to the field of pipe materials, in particular to a method for preparing high-strength corrosion-resistant copper pipes for heat exchangers. 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 maintenance has a...

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, the personnel requirements are high, and the quality requirements are high; (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 the cylinder, the needle, and preheating before work, etc. High energy consumption; (4) Stirring, ingot casting, sawing, heating, pressing, peeling, Pickling and other processes have large metal loss, low yield, and the yield of billet supply is less than 90%; (5) semi-continuous casting or split furnace casting is adopted, which has poor production continuity and low efficiency; (6) large zinc burning loss , Stirring, secondary heating, extrusion and lubrication, etc. have a lot of smoke and serious pollution; (7) The eccentricity of the tube billet is large, which affects the subsequent cold processing, especially the extrusion yield of large-diameter thin-walled brass tubes in forward extrusion is 40%. ~60%