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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 copper, brass, etc.), and the specific performance is that the hard state effect is obvious, and it is very difficult to roll or extrude. Press processing, heat treatment process control is extremely sensitive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a) According to the composition requirements of beryllium-copper pipes, mix beryllium-copper master alloy ingots and high-purity electrolytic copper ingots, then put the mixture into a graphite crucible, place the crucible with the material in a vacuum melting furnace, close the furnace door and draw Vacuum, slowly increase the temperature and heat until melting. The vacuum degree of vacuuming is 1×10 -3 Above Pa, after the heating temperature is 980°C, after the beryllium copper alloy in the graphite crucible is melted, magnetic stirring is started to fully degas the solution and pre-homogenize the alloy. Then after 40 minutes of heat preservation, start pouring in the vacuum furnace. The pouring adopts the inclined top pouring method, which can make the pouring speed uniform and controllable. After the pouring is completed, turn off the power to cool down, let the ingot cool to room temperature, open the furnace door, take out the crucible and ingot, and clean the s...

Embodiment 2

[0039] On the basis of embodiment 1, the processing condition of change is as follows:

[0040] a) The heating temperature is 1120°C;

[0041] b) slowly heating to 380°C;

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

[0043] d) Heat the tube blank after extrusion to 820°C, and keep the water temperature in the water tank at about 50°C;

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

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

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

Embodiment 3

[0048]On the basis of embodiment 1, the processing condition of change is as follows:

[0049] a) The heating temperature is 1080°C;

[0050] b) slowly heating to 430°C;

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

[0052] d) Heat the tube blank 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°C;

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

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

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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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