Forming process of Nb pipes

Abstract

The invention provides a forming process of Nb pipes, which belongs to the field of processing and manufacturing of a noble metal seamless steel pipe, and overcomes the defects of a traditional process that the heating time is long, the temperature control is not accurate, and the yield is low and the like. The forming process comprises the following production steps: 1. blanking; 2, punching a phi50 through hole; 3. carrying out finish turning on an outer surface and an end face; 4. coating water glass on the inner and outer surfaces; 5. heating by an induction furnace; 6. spraying glass powder on the inner and outer surfaces; 7. hotly chambering; 8. heating by the induction furnace; 9. spraying the glass powder on the inner and outer surfaces; 10. carrying out extrusion forming; 11. straightening; and 12. carrying out surface sand blasting, head flattening and size checking; and then packaging after ultrasonic flaw detection. According to the process, a glass powder protection method is adopted so that the heating time can be shortened in a large range and is shortened to be about 5 minutes from 6-10 hours; the temperature of a blank can be directly measured so that the process is easy to control; and the yield can be improved to be more than 80% from previous 60%-75%.

Description

technical field [0001] The invention relates to a process for manufacturing a precious metal seamless steel pipe. Background technique [0002] Nb (niobium) has a small neutron capture cross-section, high thermal conductivity and high strength, and is used as a nuclear fuel cladding material, nuclear fuel additive, and heat exchanger structural material in atomic energy reactors. Nb In the traditional extrusion process, a through hole of ?80-160 is punched in the center of the blank, sealed with a copper sheath, preheated in a resistance furnace or an annular furnace, heated in an induction furnace, and then directly entered into the extrusion machine for extrusion. The heating time is 6-10 hours, and the finished product rate is 60-75%. [0003] For the Nb billet, it needs to drill a through hole of ?80-160 before extrusion, seal it with a copper sleeve, heat it in a resistance furnace or a ring furnace, and directly enter the extrusion machine for extrusion molding. The d...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome defects such as long heating time, inaccurate temperature control, and low yield of finished products in the traditional process, the technical solution adopted in the present invention is: