Hard drawn and anneal copper 1

[freelegend]

I am doing electrical low voltage bus design. There has a problem for choosing copper bus tube material. By referring to previous design, c10200 hard drawn and c10200 annealed copper are used for different projects. Could somebody help explain the difference between hard drawn and annealed copper? Becuase these two materials have quite different yield stress (Hard drawn:345 MPA, Annealed 69 MPA), it will significant affect the other calculation results.
Thank you in advance!

Freelegend

 

[metengr]

freelegend;
You had asked this question before in this forum and you needed mechanical property data to compare. The difference between annealed copper and hard drawn (cold worked) copper is that the annealed condition is lower tensile and yield strengths and higher capacity for ductility in comparison to hard drawn copper. This is the major difference. The lower strength copper buss bar may require added support but this is something that you have to determine.

 

[EdStainless]

The problem with using hard pure copper is that it will go through recrystallization at temps only a little above ambient. over time it will get softer. If this is all water cooled you may be OK. But if you ever loose cooling you could be in for structural failure.

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