Preparation method of heavy-calibre nickel base alloy thin-walled tubular product

Abstract

The invention relates to a preparation method of a heavy-calibre nickel base alloy thin-walled tubular product, which comprises the steps of: 1, preparing a nickel base alloy tube blank by adopting a thermal backward extrusion process, wherein the extrusion temperature is 1000-1250 DEG C, the worker die preheating temperature is 450-550 DEG C, the extrusion speed is 25mm / s-60mm / s; 2, thinning through cold spinning with strong force, wherein the first pass of thinning rate is 20-75 percent, other passes of thinning rates are 25-30 percent, the deformation during thermal treatment (annealing or solution treatment) is 50-75 percent, the feeding ratio of two passes before a finished product is obtained is 0.5mm / n-0.7mm / n, and feeding ratios of other passes are 0.8mm / n-1.5mm / n; and 3, carrying out thermal treatment (annealing or solution treatment) on a semi-finished product or finished product, scouring and cleaning. The heavy-calibre nickel base alloy thin-walled tubular product processed by adopting the invention has the advantages of high material utilization rate, low cost and high additional value, is suitable for massive production, and has remarkable economic benefit and social benefit.

Description

technical field

[0001] The invention relates to a method for preparing a large-diameter nickel-based alloy thin-walled pipe, belonging to the technical field of pipe processing. Background technique

[0002] Nickel-based alloy pipes have good high-temperature corrosion resistance, oxidation resistance and excellent corrosion resistance. Large-diameter nickel-based alloy thin-walled pipes are mainly used in aviation, chemical, nuclear energy installations and other fields. The preparation of large-diameter nickel-based alloy thin-walled pipes is difficult. The traditional methods for producing large-diameter nickel-based alloy thin-walled pipes mainly include ①Nickel-based alloy forged rod + machining (drilling and turning). The utilization rate is extremely low and the waste is serious. ②Centrifugal casting + spinning process to prepare large-diameter nickel-based alloy thin-walled pipes. This method has been successfully used in Hastelloy series alloy large-diameter nickel-...