SAME HEAT.. DIFFERENT CHEMISTRY
SAME HEAT.. DIFFERENT CHEMISTRY
(OP)
I have a case where there are two bolts
1. one is 12M-1.75*45mm
and 2. another one is 12M-1.75*35mm
1.75 is thread
12M is bolt size
45 and 35 is bolt length.
Now the supplier has provided MTC for both with the same heat number but different chemical properties...
Is this possible??
1. one is 12M-1.75*45mm
and 2. another one is 12M-1.75*35mm
1.75 is thread
12M is bolt size
45 and 35 is bolt length.
Now the supplier has provided MTC for both with the same heat number but different chemical properties...
Is this possible??





RE: SAME HEAT.. DIFFERENT CHEMISTRY
RE: SAME HEAT.. DIFFERENT CHEMISTRY
RE: SAME HEAT.. DIFFERENT CHEMISTRY
How different are the chemistries, and what elements are different?
Are they both "in spec", but just a bit different?
Is there any reason to expect that all of the screws came from the same wire, or even the same batch of wire?
It seems entirely possible that - rightly or wrongly - they decided that these two bolt sizes were "close enough" that they could be run through the oven together.
See Tip #7: http://www.heat-treat-doctor.com/documents/Fastene...
RE: SAME HEAT.. DIFFERENT CHEMISTRY
I have attached the MTC Copy for your reference, please suggest ur opinion now
Regards
RE: SAME HEAT.. DIFFERENT CHEMISTRY
Please review and comment.
Regards
MNT
RE: SAME HEAT.. DIFFERENT CHEMISTRY
rp
RE: SAME HEAT.. DIFFERENT CHEMISTRY
Look at dates, certificate numbers, order numbers.
Also, the sizes listed on the certs do not match the sizes stated in your first post.
Lot size is listed as 50,000 parts. How many parts were tested? One of each? That's pointless.
RE: SAME HEAT.. DIFFERENT CHEMISTRY
RE: SAME HEAT.. DIFFERENT CHEMISTRY
While it is possible you are looking at a "fabricated" certificate, it is equally likely (or perhaps even more likely) that we are looking just at a clerical error. A little more research would be needed to determine whether or not fraud is at the root.
Please, contact the supplier for an explanation. Then, you can formulate an opinion on whether or not the information on the certificate is intentionally falsafied or not.
rp
RE: SAME HEAT.. DIFFERENT CHEMISTRY
Best regards - Al
RE: SAME HEAT.. DIFFERENT CHEMISTRY
That's something in excess of 11,000 kg of steel.
And from all of that there were TWO bolts tested.
It doesn't matter if these certs are legitimate or forged. They are worthless.
RE: SAME HEAT.. DIFFERENT CHEMISTRY
If the pouring is carried out in diffreent slab, then due to delay in pouring there may be chances for chemistry change (Minor).
I have witnessed this situation..
Regards
Aakash Jha
RE: SAME HEAT.. DIFFERENT CHEMISTRY