High-performance large-size beryllium copper tube preparation method

A large-size, high-performance technology, applied in the field of pipe processing, can solve problems such as difficult rolling or extrusion processing, obvious hard state effect, and extremely sensitive heat treatment process control, so as to achieve the effect of improving material utilization and yield

Active Publication Date: 2013-12-11
宁夏西泰克金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to some characteristics of beryllium, when a small amount of beryllium is added to copper, its properties will change dramatically compared with conventional copper alloys (such as copp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1:

[0028] a) According to the composition requirements of beryllium copper pipes, proportion the beryllium copper master alloy ingots and high-purity electrolytic copper ingots, then put the mixture into a graphite crucible, put the material crucible in a vacuum melting furnace, and close the furnace door to extract Vacuum, slowly heat up and heat until it melts. The vacuum degree of the vacuum is 1×10 -3 After the heating temperature is 980°C above Pa, the beryllium copper alloy in the graphite crucible is melted, and magnetic stirring is started to fully degas the solution and pre-homogenize the alloy. Then, after holding for 40 minutes, start pouring in the vacuum furnace. The pouring adopts the inclined top pouring method, so that the pouring speed can be uniform and controllable. After pouring is completed, cut off the power to cool down, cool the ingot to room temperature, open the furnace door, take out the crucible and ingot, and clean the surface of th...

Example Embodiment

[0038] Example 2:

[0039] On the basis of Example 1, the changed process conditions are as follows:

[0040] a) The heating temperature is 1120℃;

[0041] b) Slowly heat to 380℃;

[0042] c) The speed of extrusion and billeting is 0.5 m / min, and the extrusion ratio is 3:1;

[0043] d) Heat the billet after extrusion to 820℃, and keep the water temperature in the water tank at about 50℃;

[0044] f) The rolling feed rate is 7 mm / time, the first pass processing rate is 25%, and the second pass processing rate is 18%;

[0045] h) The aging temperature is kept at about 280℃;

[0046] i) Soak for about 6 minutes and wipe clean with alcohol after taking it out.

Example Embodiment

[0047] Example 3:

[0048] On the basis of Example 1, the changed process conditions are as follows:

[0049] a) The heating temperature is 1080℃;

[0050] b) Slowly heat to 430℃;

[0051] c) The extrusion speed is 0.3 m / min, and the extrusion ratio is 2.5:1;

[0052] d) Heat the billet after extrusion to 780°C, and keep the water temperature in the water tank at about 40°C;

[0053] f) The rolling feed rate is 5 mm / time, the processing rate of the first pass is 22%, and the processing rate of the second pass is 17%;

[0054] h) The aging temperature is kept at about 320℃;

[0055] i) Soak for about 5 minutes, and wipe clean with alcohol after taking it out.

[0056] In the above embodiment, the length dimension of the finally obtained beryllium copper pipe is 4000 mm, the dimensional accuracy of the inner and outer pipe diameter and the thickness of the pipe wall can reach ±0.2 mm / m, and the tensile strength of the beryllium copper pipe is 1280~ Between 1420MPa, the elongation is between ...

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Abstract

The invention discloses a high-performance large-size beryllium copper tube preparation method which comprises the following steps: performing ingot casting on beryllium copper, homogenizing treatment on an ingot, drilling, cogging, quenching heat treatment on an extruded and cogged tube blank, surface finishing, rolling, straightening, aging heat treatment, surface passivating treatment, nondestructive inspection, wall thickness measurement and the like. The beryllium copper tube produced by using the process in the invention is good in material yield and material utilization, the tensile strength of the finally obtained beryllium copper tube is between 1,280 MPa and 1,420 MPa, the ductility is between 3% and 5%, the surface hardness is within the scope of HRC38-42, the grain size is between 7micrometers and 10 micrometers, and all the performances are better than various technical indicators of the prior art. The length of the beryllium copper tube machined through the technology is as long as 4,000 mm, and the dimensional accuracy of inner and outer pipe diameters and the tube wall thickness can be controlled to be less than about plus or minus 0.2 mm/m.

Description

technical field [0001] The invention relates to a pipe processing method, in particular to a preparation method of a high-performance large-size beryllium copper pipe. Background technique [0002] Beryllium copper alloy is a precipitation hardening alloy. It is the only non-ferrous alloy with good combination of mechanical properties, physical properties, chemical properties and corrosion resistance. It has high strength, high hardness, high electrical conductivity, high elasticity, wear resistance and corrosion resistance. It has the characteristics of fatigue, corrosion resistance and small elastic hysteresis, and also has good casting performance, non-magnetic and non-spark discharge performance during impact. [0003] Because beryllium copper alloy has many excellent properties, its application is more and more extensive, and it has become an indispensable important industrial material in the national economic construction. Foreign beryllium-copper alloys are mainly us...

Claims

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Application Information

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IPC IPC(8): C22F1/08
Inventor 赵皓舒永春邓铁明
Owner 宁夏西泰克金属材料有限公司
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