Heated mould continuous casting-continuous drawing method of cupronickel alloy condenser pipes

Abstract

The invention discloses a heated mould continuous casting-continuous drawing method of cupronickel alloy condenser pipes, which is characterized by comprising the following steps: 1, obtaining cupronickel pipe blanks by the heated mould continuous casting method; 2, drawing the pipe blank; 3, carrying out 3-pass drawing; and 4, carrying out combined drawing, finishing, washing and final annealing to obtain the finished product. The pipe blanks of which the diameter is more than or equal to 1mm and less than or equal to 50mm are subject to combined drawing, and 3-pass disk drawing; the pipe blanks of which the diameter is more than 50mm and less than or equal to 108mm are subject to combined drawing, and 3-pass straight drawing; and the pipe blanks of which the diameter are more than 108mm and less than or equal to 319mm are subject to combined drawing, and 3-pass hole enlargement drawing. In the heated mold continuous casting-continuous drawing method provided by the invention, the processes are reduced, the casting yield is improved, the energy consumption of the ingot casting heating-extrusion process is lowered, and the cost is reduced greatly.

Description

technical field [0001] The invention relates to a method for preparing a cupronickel alloy pipe, in particular to a hot-type continuous casting-continuous stretching method for a cupronickel alloy condensation pipe. Background technique [0002] For the production process of existing copper alloy condenser tubes, please refer to figure 1 , it can be seen that the existing technology adopts the vertical semi-continuous casting process to produce solid ingots, cut them into short ingots with a length of 400-600mm, and heat the short ingots to 800-1000°C (depending on the type of alloy). Hollow tube blanks are obtained by perforating and extruding on a double-acting extruder. The billets are sawed to length, straightened, pickled and then pilger rolled. The rolled tube billet needs to be cut into 4-6m short tubes, followed by annealing, pickling, head making, and stretching; the stretched tube billet needs to be cut into 4-6m short tubes, and then annealed again, Pickling, h...

AI Technical Summary

Problems solved by technology

The rolled tube billet needs to be cut into 4-6m short tubes, followed by annealing, pickling, head making, and stretching; the stretched tube billet needs to be cut into 4-6m short tubes, and then annealed again, Pickling, head making, and stretching; repeated 3-5 times, the process is long and the production passes are many; extrusion heating, repeated annealing, high energy consumption; extrusion process tooling loss, high cost; pickling process High metal loss

In particular, the quality of the products is low, and it is impossible to produce ultra-long copper alloy condenser tubes.

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