×
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

Molybdenum/iron content in zirconium

Molybdenum/iron content in zirconium

Molybdenum/iron content in zirconium

(OP)
I have an old heat exchanger with supposedly zirconium tubes (grade 702).  When I attempted to PMI the material, the results do not match the current ASME/ASTM spec for grade 702 zirconium.  Specifically, the analyzer is reporting around 1 to 1.5% Moly and an iron content exceeding 0.5%.

The specification I have does not specify any Moly and limits iron content to 0.2% maximum.

Does anyone know if grade 702 ever permitted such alloy contents?  I appreciate any advice.

Millar Iverson

RE: Molybdenum/iron content in zirconium

Is your analyzer properly calibrated for zirconium alloys?

RE: Molybdenum/iron content in zirconium

(OP)
Good point.  I followed the normal standardization procedure for the analyzer (uses a 316 stainless steel calibration block).  There is no mention of a special calibration for other alloys.

RE: Molybdenum/iron content in zirconium

I would check with the manufacturer - typically analyzers have to be set up specifically for the alloy types being tested.

RE: Molybdenum/iron content in zirconium

I checked some of my old "1960s" literature as well as more recent regarding Zr and no Mo containing Zr alloys were found. Like Carburize, I suspect that the analysis is in error and you should check with the analyzer manufacturer.  Your analyzer may not be able to provide a true quantitative analysis for the 702 alloy and you may have to send it to an appropraite chem/met lab for a true quantitative analysis.

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