Is "Half Hard" a legitimate specification for condition of Cu Tube?

[RawheadRex]

Hi,

I'm hoping that I've posted this question in the correct forum. The question is exactly what is in the subject line.

I have been given the task of compiling the standard materials used in the products manufactured by the company I workd for into a central database. A rather tedious task to undertake as one might imagine. As the organization has been in existence for some time I have some internal specifiactions going back more than 30 years. Anyhow enough useless drivel.

Here's my problem. I have a spec sheet in front of me designating CDA 122 (UNS C12200) round copper tube of a certain size in the "half-hard" condition. It's been determined that this tubing should comply with ASTM B75 (which I have in front of me) but the temper designation chart doesn't seem to reference any such animal. The table contents are H55 (Light Drawn), H58 (Drawn/General Purpose), H80 (Hard Drawn), O60 (Soft Anneal), and O50 (Light Anneal).

Alas, I would very much appreciate if anyone out there can help me to determine if specifying round tube in "half-hard" condition is legitimate or if one of the existing ASTM B75 temper selections is equivalent.

I've done a fair amount of searching around the web but couldn't turn up any info of obvious help to me. The only thing that I did note was that "half-hard" tubing is manufactured to various foreign standards (DIN, JIS, etc.).

Chris Gervais
Sr. Mechanical Designer
Lytron Corp.

 

[unclesyd]

I just called a large piping supply company and they still use "half-hard" which they say is marked H58.

 

[RawheadRex]

unclesyd,

Thanks so much for the feedback. I had a feeling that H58 corresponded to "half-hard" but couldn't turn up anything in the way of corroboration. That is, until you posted your info from the conversation you mentioned.

Thanks again! You've been most helpful.


Chris Gervais
Sr. Mechanical Designer
Lytron Corp.