Method for manufacturng copper or copper alloy base and copper alloy pipe

Abstract

A technology for producing Copper or Cu-alloy billet or tube includes such steps as flowing molten copper or Cu-alloy in crystallizer, solidifying while applying a rotary or axially alternative magnetic field to it to become billet, and cold rolling or cold drawing to become tube. Applying magnetic field can decrease micro pinhole in structure and improve its cold machinability.

Description

technical field [0001] The invention relates to a method for casting copper or copper alloy blanks and tubes thereof. Background technique [0002] In the prior art of manufacturing copper alloy pipes, the first type is to hot-extrude the as-cast ingot (dynamic recrystallization occurs) and then cold-rolled or directly drawn by a pilger mill. The second type is to roll the hollow cast billet by PSW planetary oblique rollers (during the rolling process, due to the deformation of the billet, the heating temperature can reach about 700°C, and a dynamic recrystallization process will occur, which is a thermal processing process), and then Various drawing processes are performed. Although the method of PSW planetary oblique roll rolling has cold working words in the title of the patent with the publication number CN1019750B and the title "Method for Cold Working Copper and Copper Alloy Pipes", it only refers to the fact that the billet enters the PSW planetary rolling mill at ro...

AI Technical Summary

Problems solved by technology

The third category is direct drawing of the continuous casting billet, which requires intermediate heat treatment in the process of processing, but because it cannot eliminate the defects of the continuous casting billet and the grain and crystal phase structure have obvious processing texture, the product performance is poor, and now Has been basically eliminated