×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Question on Hard Brass
2

Question on Hard Brass

Question on Hard Brass

(OP)
Hi all,

Once again I would need your light. Really, I received an antenna drawing (which will go to space) made of Hard Brass. I have to perform some mechanical and thermal analysis and I had a look in my book to get the mechanical properties but I have data for the following:

Red Brass (85% Cu), Low Brass (80% Cu), Copper Brass (70% Cu) and Yellow Brass (65% Cu) but nothing about Hard Brass... Does anyone know what is the copper content of Hard Brass?

Finally, I know that Brass is TVAC compatible but I am wondering if there is some constraint while using this material (apart from corrosion cracking which I am aware of) since this is the first time I have seen it on a flight hardware.

Best regards,

Franck

RE: Question on Hard Brass

Sounds like you need to contact the drawing supplier and confirm materials, if it's critical.  I don't know that those different brass terms are always used for specific percentages.  They normally use the alloy numbering system to nail it down more.

RE: Question on Hard Brass

Perhaps if you could get the actual alloy number.  e.g., red brass is C23000; low brass is C24000; etc...  There's a table in Mark's Handbook extracted from the "Copper Development Association" in which I have a few more "brass" alloys with the corresponding compositions.  The name alone isn't enough in this particular table.

 

RE: Question on Hard Brass

Oh, another thing.  You may want to look at what the long-term high vacuum effects on brass are.  Some alloy constituents of brass have non-negligible vapor pressures at room or slightly elevated temperatures.  I.e. things like cadmium or lead may slowly evaporate from the alloy over time, resulting in these elements plating-out onto other surfaces where you'd rather they not be.  Just because you can pull a "hard" vacuum for a brief time with these alloys doesn't mean their long-term use in space or in high vacuum is advisable.

RE: Question on Hard Brass

(OP)
Thanks all to your valuable posts!

Best regards,

Franck

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources