High-strength corrosion-resistant micro-alloying copper pipe and manufacturing method thereof

Abstract

The invention discloses a high-strength corrosion-resistant micro-alloying copper pipe material which consists of the following components in percentage by weight: 0.005-0.04% of phosphorus, 0.2-1.0% of tin, 0-0.04% of lanthanum, 0-0.04% of cerium, 0-0.1% of nickel, 0-0.1% of zinc, 0-0.05% of cobalt, 0-0.1% of manganese, 0-0.05% of zirconium and the balance of copper. By combining phosphorus with rare earth lanthanum and / or cerium to obtain a deoxidizer of molten copper, the content of oxygen in melt is further reduced, the grain structure is refined, the recrystallization temperature is increased to prevent abnormal growth of the weld structure grain, and the ductility and thermal conductivity of copper are further improved. Through solid solution strengthening of tin and improvement of an oxide film on a surface layer, the strength and corrosion resistance of a matrix are improved. By adding trace amount of zinc, nickel and manganese subjected to solid solution into the copper matrix, the strength of the copper matrix is improved; by adding cobalt or zirconium and dispersing into the copper matrix, the strength and heat resistance of the copper matrix are improved; the combination effect is better than the performance and using effect of the existing oxygen-free copper pipe or single phosphorus deoxidization copper pipe.

Description

technical field [0001] The invention relates to a copper alloy tube material, in particular to a microalloyed copper tube material and a manufacturing method thereof. Background technique [0002] Copper alloy has good heat transfer, corrosion resistance and other characteristics, and is widely used in heat exchangers, such as air conditioners, water heaters and other fields. At present, the materials used for heat exchangers are mostly oxygen-free copper tubes or phosphorus deoxidized copper tubes (TP2), but when serving in special environments, such as high pressure and corrosive environments, ordinary TP2 or oxygen-free copper tubes cannot meet the service requirements. For example, during the welding process of TP2 copper pipes, due to the sharp increase in the temperature of the weld, recrystallization of the weld structure occurs, and the grains grow abnormally, resulting in low material strength in the welding heat-affected zone. When the critical pressure is in servi...

AI Technical Summary

Problems solved by technology

However, none of them can achieve comprehensive properties such as high strength, corrosion resistance, and high efficiency.

A copper alloy tube for heat exchanger as proposed in patent 201110174411.9, its composition: Sn0.5-1.0 wt%, P0.05-0.1 wt%, Al2.2-8.5 wt%, Mn0.5-1.8 wt%, Fe0 .15-0.35 wt%, the balance is composed of copper and unavoidable impurities. Although the alloy has good strength and heat resistance, its plasticity is low, resulting in high processing costs

At the same time, the thermal conductivity of this material is low, which seriously affects the heat transfer efficiency of the material, and cannot achieve the ideal effect of low cost and high efficiency.

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