Mill MTR charpy standard
Mill MTR charpy standard
(OP)
My governing standards for many of my projects require Charpy testing per ASTM A370. (Per ABS rules, DNV rules, ASME, etc).
However, nearly all the MTRs for available stocked material, that include Charpy results, do not list which standard the Charpy testing was done under.
So far this has not come up as a problem with the surveyors, so I'm having a hard time convincing myself that this material needs to be retested to confirm compliance with A370.
Have any of you come across this particular requirement-vs-availability issue? Would love to hear how you are handling it.
Thanks!
However, nearly all the MTRs for available stocked material, that include Charpy results, do not list which standard the Charpy testing was done under.
So far this has not come up as a problem with the surveyors, so I'm having a hard time convincing myself that this material needs to be retested to confirm compliance with A370.
Have any of you come across this particular requirement-vs-availability issue? Would love to hear how you are handling it.
Thanks!






RE: Mill MTR charpy standard
A simple phone call to the outfit certifying the MTR should be all you need, if you really are questioning whether the proper testing was performed.
Now, if you honestly believe the CVN testing was not performed correctly or that the results reported are not representative of the material, then re-testing is called for. But, to require re-testing just because the MTR does not state that the testing was performed in accordance with A370 is a bit overbearing.
While I have had customers call and request our MTRs state that the Charpy testing was performed in accordance with ASTM E23, but I have never seen anyone ask for re-testing just because this was not stated on the MTR.
rp
RE: Mill MTR charpy standard
RE: Mill MTR charpy standard
So for other materials ie 4130 (not astm), now my issue is whether I leave "Charpy test per ASTM A370..." as a requirement on my material POs. If I take if off, then I'm assuming liability if we get some bad material. If I leave it on, then I have to educate my suppliers that all their material (probably) meets this spec.
I'm not seeing where ISO 148 is obsolete? It did replace EN 10045.
RE: Mill MTR charpy standard
Actually, all of this information belongs in a material specification, and your PO should just refer to that specification. If there isn't an applicable ASTM or other globally recognized standard, then write your own. Yes, it is acceptable to just have the PO state your requirements, but if this information has to be repeated every time you issue a new PO, you run the risk of mistakes occurring. That is the purpose of the written specification. It also helps keep the PO clean and easy for your vendors to understand. Generally, the people who write up the PO's on your end and accept the PO's on your vendor's end are not the people in the organization with the highest technical knowledge, so simple mistakes (such as a minimum yield strength of 1050000 PSI) may simply get passed through the system without anyone noticing. By the time the mistake is found, it may be too late.
rp