Forming process of Nb pipes

A technology of forming process and production steps, applied in the field of precious metal seamless steel pipe processing and manufacturing process, can solve the problems of inaccurate temperature control, low yield, long heating time, etc., and achieve the effect of easy process control and shortening heating time

Active Publication Date: 2015-01-07
SHANDONG YAO CHENG NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome defects such as long heating time, inaccurate temperature control, and low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0054] Example

[0055] 1. The product specifications of the niobium tube: outer diameter 155~159mm, inner diameter 127~131mm.

[0056] 2. Production process: blank preparation-primary induction heating-reaming-secondary induction heating-extrusion-water cooling. Each specific process link refers to the above process methods and conditions.

[0057] 3. Hot extrusion process.

[0058] 3.1 Induction heating: the target temperature of the primary induction furnace is 950~1100℃, and the target temperature of the secondary induction furnace is 1050~1100℃.

[0059] 3.2 Hot reaming: the size of the reaming cone is 135mm. The outer surface of the blank reaming is lubricated by VP68 / 2886, and the inner hole is lubricated by EG6807S1I.

[0060] 3.3 Extrusion parameters: The extrusion ratio is 7.2, and the length of the waste pipe after extrusion is 6m. Extrusion parameter setting:

[0061] Extrusion speed Leftover length cooling method 17% 25mm Water cooling

[0062] The outer surface of...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): B21C37/06
CPCB21C37/06
Inventor 张丙静施恩贵杨琦锋宋建
Owner SHANDONG YAO CHENG NEW MATERIALS TECH CO LTD
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