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Material Test Report interpretation

Material Test Report interpretation

Material Test Report interpretation

(OP)
Hello. Steel Plate usually reads Carbon in percentage, say 0.21 or 21%  I have a report reading -4 with a note that chemical units -4 = -4:x1/10000
 Question: how do I interpret or convert to percent?
  Thanks for your help.   

RE: Material Test Report interpretation

GenB;

The percent by mass of Carbon would be

4/10000 x 100% = 0.04%

RE: Material Test Report interpretation

Or, would it mean, .04 pct lower than the low limit of the spec?

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Material Test Report interpretation

GenB,

Metengr gave you the correct answer to your question.  I just wanted to clarify in your example that a typical carbon steel would contain 0.21% Carbon (by mass), not 21%.  Most carbon steels are > 98% iron with ~ 1% Mn and < 1% carbon + silicon + all the rest of the elements.

RE: Material Test Report interpretation

If in your case the certificate value specifies C = 1950 the carbon content would be 1950/10000 = 0.195%.

RE: Material Test Report interpretation

(OP)
I'm sorry I have been out for a while.
actually I found the answer. by feith I asked a young and no enginner, my own daughter. she analized it and said: it does not make sense and cannot be constant or formulae but an just information on data.
I look further and there it was, the 4:x1/10000 just meant the given number divided by 0000,
Thanks all for trying, I had a nightmare. I'm embarassed.
and no, she refuse to be a BPV QC or AI. She preffers a reg. office job.
 

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