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Preparation method of precious metal seamless pipe

A precious metal and seamless tube technology, applied in the field of precious metal materials, can solve the problems of inability to mass production, low production efficiency, and difficult preparation of seamless tubes, etc., and achieve the effects of stable and reliable products, high production efficiency, and shortened production cycle.

Active Publication Date: 2020-01-10
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some special fields, it is necessary to use seamless precious metal pipes with high density, excellent mechanical properties, uniform wall thickness, and smooth wall surface to improve the stability and reliability of use. However, due to the limitations of welded pipes, the existing The seamless pipe prepared by welding the pipe cannot meet the requirements, and the preparation technology of the seamless pipe in the precious metal industry is difficult, and the production efficiency is low, so it cannot be mass-produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing a seamless gold pipe, characterized in that it comprises the following steps:

[0031] 1) Take the proportioning ingredients of any precious metal or precious metal alloy. The precious metal is any one of gold, silver, platinum, and palladium with a purity ≥ 99.95%, or a precious metal alloy. The precious metal alloy is an existing precious metal alloy , such as platinum rhodium alloy, platinum iridium alloy. This embodiment: prepare a seamless gold tube, which is taken as simple gold with a purity ≥ 99.95%;

[0032] 2) Vacuum intermediate frequency melting:

[0033] The gold element is placed in a smelting furnace for smelting, the smelting temperature is 100-200°C higher than the melting point of the gold element, and a protective atmosphere is filled in the smelting furnace. In this embodiment, the protective atmosphere adopts argon, or Other protective atmospheres can be used. After the precious metal is completely melted, electromagnetic st...

Embodiment 2

[0045] Preparation of silver palladium 20 seamless pipe

[0046] A kind of preparation method of silver-palladium seamless pipe, is characterized in that, comprises the following steps:

[0047] 1) Take silver with a purity ≥99.95% and palladium with a purity ≥99.95% according to AgPd20 to form a silver-palladium alloy AgPd20;

[0048] 2) Vacuum intermediate frequency melting:

[0049] The silver-palladium alloy is placed in a melting furnace for smelting, the melting temperature is 100-200°C higher than the melting point of the silver-palladium alloy, and the melting furnace is filled with a protective atmosphere. In this embodiment, the protective atmosphere is argon , and other protective atmospheres can also be used. After the precious metal is completely melted, it is evenly stirred by electromagnetic stirring and kept warm for 2 to 5 minutes, and cast immediately to obtain a rod-shaped ingot;

[0050] 3) Hot extrusion:

[0051] The ingot obtained in step 2) is subject...

Embodiment 3

[0061] Preparation of seamless platinum tubes

[0062] A method for preparing a seamless platinum pipe, comprising the following steps:

[0063] 1) It is taken as platinum element with a purity ≥ 99.95%;

[0064] 2) Vacuum intermediate frequency melting:

[0065] The platinum element is placed in a smelting furnace for smelting, the smelting temperature is 100-200°C higher than the melting point of the platinum element, and a protective atmosphere is filled in the smelting furnace. In this embodiment, the protective atmosphere is argon. Other protective atmospheres can be used. After the precious metal is completely melted, it is evenly stirred by electromagnetic stirring and kept for 2 to 5 minutes, and then cast immediately to obtain a rod-shaped ingot;

[0066] 3) Hot extrusion:

[0067] The ingot obtained in step 2) is subjected to surface finishing treatment. First, the ingot is turned to a cylindrical bar 1-5mm larger than the actual size, and then the surface finishi...

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Abstract

The invention discloses a preparation method of a precious metal seamless tube. The preparation method comprises the following steps that (1) proportioning and bathing of any kind of precious metal ora precious metal alloy are taken; (2) vacuum intermediate frequency smelting is conducted; (3) hot extrusion is conducted, specifically, surface finishing treatment is conducted on a casting ingot obtained in the step (2), the preheating temperature of the casting ingot is 300-1000 DEG C, and hot extrusion is conducted to obtain a tube billet; (4) cold rolling is conducted, specifically, multi-pass rolling machining is conducted on the tube billet obtained in the step (3); (5) drawing is conducted, specifically, multi-pass wall thickness reducing drawing is conducted on the cold-rolled tube billet obtained in the step (4); (6) polishing is conducted, specifically, a tube material obtained in the step (5) is subjected to inner surface polishing and outer surface polishing by adopting a physical-chemical method; and (7) cleaning is conducted. The seamless tube prepared through the preparation method of the precious metal seamless tube has the characteristics of being uniform in material, consistent in thickness, bright in tube wall, high in density, excellent in mechanical properties, stable and reliable in using and the like.

Description

technical field [0001] The invention belongs to the field of noble metal materials, in particular to a preparation method of a noble metal seamless pipe. Background technique [0002] At present, seamless pipes can be prepared by casting, forging, welding and other processes, and most of them are processed by welding pipe technology. In some special fields, it is necessary to use seamless precious metal pipes with high density, excellent mechanical properties, uniform wall thickness, and smooth wall surface to improve the stability and reliability of use. However, due to the limitations of welded pipes, the existing The seamless pipe prepared by welding the pipe cannot meet the requirements, and the preparation technology of the seamless pipe in the precious metal industry is difficult, and the production efficiency is low, so it cannot be mass-produced. Contents of the invention [0003] The object of the present invention is to provide a preparation method of a noble me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06B24B29/08C25F3/22C22F1/14C21D8/10
CPCB21C37/06B24B29/08C21D8/10C22F1/14C25F3/22
Inventor 万伟建唐会毅吴保安吴强罗维凡刘庆宾廖兴涛
Owner CHONGQING MATERIALS RES INST
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