Preparation method of niobium alloy long thin-walled pipe

Abstract

The invention discloses a preparation method of a niobium alloy long thin-walled pipe. The preparation method comprises the following steps: 1, a completely recrystallized niobium alloy rod is drilled and bored; 2, an inner hole of the niobium alloy pipe blank is honed; 3, the honed niobium alloy pipe blank is subjected to acid pickling and water washing, and then normal-temperature cogging is conducted; 4, the cogged niobium alloy pipe is subjected to acid pickling and water washing, then intermediate annealing is conducted, and then rolling is conducted; and 5, the niobium alloy pipe semi-finished product is subjected to acid pickling and then subjected to complete recrystallization annealing, and the niobium alloy long thin-walled pipe is obtained. By controlling the surface quality, the rolling parameters and the complete recrystallization annealing temperature of the niobium alloy pipe blank, the niobium alloy long thin-walled pipe which is short in processing period, high in surface quality and good in plasticity is obtained, the wall thickness of the thin-walled pipe is 0.5-1 mm, the length of the thin-walled pipe is 3000-6000 mm, the surface roughness of the thin-walled pipe is not larger than 1.6 micrometers, and the requirement for the niobium alloy long thin-walled pipe in the market is met.

Description

technical field [0001] The invention belongs to the technical field of pipe preparation of refractory metal materials, and in particular relates to a method for preparing a long and thin-walled niobium alloy pipe. Background technique [0002] Niobium-tungsten alloy can maintain high strength at high temperature, has excellent welding performance and corrosion resistance at room temperature, and has good processing performance. It can be made into thin plates and parts with complex shapes, and is widely used in aerospace vehicles, satellites, and missiles. It is also one of the preferred materials for the preparation of metal pipe fittings in harsh environments. [0003] Niobium-tungsten alloy has high strength at room temperature, and its plasticity is poorer than that of titanium and steel. It is relatively difficult to produce thin-walled niobium-tungsten alloy pipes. [0004] The patents with publication number CN104561575A and CN108213109A only report the preparation m...

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Problems solved by technology

[0003] Niobium-tungsten alloy has high strength at room temperature, and its plasticity is poorer than that of titanium and steel. It is relatively difficult to produce thin-walled niobium-tungsten alloy pipes.

[0004] The patents with the publication number CN104561575A and CN108213109A only report the preparation method of niobium-zirconium alloy pipes, which are respectively obtained by powder static pressure molding, sintering or extruding into pipes, and the preparation cycle is relatively long. The preparation has not been reported in China

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