A production method of hard-to-deform alloy composite double-layer pipe

Abstract

The invention discloses a production method of a hard-to-deform alloy composite double-layer pipe, belonging to the technical field of alloy seamless pipe production. It includes the following steps: 1. Produce the hard-to-deform alloy tube blank by centrifugal casting process; 2. Machining the inner and outer walls of the hard-to-deform alloy tube blank; 3. Heating the hard-to-deform alloy tube blank to 1000°C-1200°C; 4. Use a reamer to ream the hard-to-deform alloy tube blank in the reaming cylinder; 5. Heat the hard-to-deform alloy tube blank to 1050°C-1250°C; 6. Use an extruder to heat the hard-to-deform alloy tube blank Extrusion to produce a three-layer alloy composite waste pipe; 7. Perform softening heat treatment and straightening of the three-layer alloy composite waste pipe; 8. Remove the inner layer of the three-layer alloy composite waste pipe by machining, and then heat-treat the pipe . The production method can effectively prevent the cracks of the hard-to-deform alloy pipes and improve the yield, and most of the hard-to-deform alloys of the pipes are replaced by ordinary carbon steel, thereby reducing the production cost.

Description

technical field [0001] The invention belongs to the technical field of alloy seamless pipe production. Background technique [0002] Difficult-to-deform alloys refer to a class of alloys that have the characteristics of low processing plasticity, high deformation resistance and narrow deformation temperature range during thermal processing. Its chemical composition is complex, the degree of alloying is high, and it has good high temperature strength, oxidation resistance and comprehensiveness. It is used to manufacture high temperature parts and corrosion resistant parts of machinery in industries such as aviation, power generation, boiler, chemical industry and instrumentation. The trial production and production of difficult-to-deform alloy seamless pipes are carried out on the basis of the development of these alloy materials, which is an important aspect of the application of these alloy materials. [0003] Difficult-to-deform alloy seamless pipes are used to manufactur...

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Problems solved by technology

[0004] Common hard-to-deform alloys include 028, 825, 625, G3, and Cr26. Due to their poor high-temperature plasticity and narrow hot-forming intervals, conventional hot-rolling or hot-piercing methods cannot be used.

At present, the forming process of difficult-to-deform alloy seamless pipes is: smelting → die casting → forging → hot extrusion, which must be processed by hot extrusion technology, but the control of the hot processing process is difficult, and the inner wall of the extruded pipe often has serious cracks. Yield is low

At present, China is still unable to fully industrialize production, so it is of great significance to further explore the characteristics of its molding process

[0005] Analysis of the causes of cracks in hard-to-deform alloy pipes: At present, hard-to-deform alloy pipes are generally produced by hot extrusion. The cylinder is in contact, and the tail is in contact with the extrusion pad, resulting in heat conduction between the inner and outer walls of the blank and the deformation tool, the temperature of the blank will drop, the temperature is not in the optimal plastic range during deformation, and the deformation plasticity decreases. At the same time, the inner and outer walls of the blank and the deformation tool There is a large friction force between them, which is prone to cracks

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