Mill MTR 1

[azizur447]

What are the basic feature should have in a material test report other than mechanical chemical test report. I got some mtr of 316ss from various supplier how do I confirm that this one is from original melting shop.

 

[redpicker]

The MTR is just a report. That is, a report of data; data that support the assertion that the material meets the requirements of the specification it is being certified as meeting. If you don't trust the data, it really doesn't matter where the MTR is from. Likewise, if you trust the data, it also doesn't matter where the MTR is from.

Many large producers will purchase material from commercial sources other than their own shops. This does not mean the material is not of the same quality as the material from their own shop, just they have outsourced some of the processing.

What I guess I am saying is that instead of worrying about whether or not the MTR is from the original melt shop, you should be worried whether or not you can trust the company that issued the MTR. If you trust the source of the MTR, it really doesn't matter where the melt shop is. If you don't trust the source of the MTR, then your due diligence should include some checks to insure the material is what it represented to be.

rp

 

[arunmrao]

azizur,

You are seeking an information from a source that is doubtful, do not go there. Else, carry your independent check. Normally, if you buy from SAIL , you are safe .

Essentially, the MTR must provide the chemical and physical properties with suitable identification to ensure traceability.

 

[EdStainless]

Unless you stipulated that the original mill cert be supplied then there is no reason for it to be.
To be technically accurate though, any information reported that was not generated by the entity providing the cert should be backed up with the original MTR that was the source of that data or at least refer to the source.
Ultimately the spec that you ordered to dictates what information must be provided.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[SJones]

For the first part of the question, refer to EN 10168 from which the required information could be selected and specified. Under EN 10204, manufacturers can transfer across test results for incoming material across onto inspection documents for the supplied material, but have to be able to provide the incoming material inspection documents if so required. If it wasn't required, it is unlikely to be supplied.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[mahadhatu]

The basic features of a MTR is what is relevant to you. If you have a certain specification you are looking for, make sure the MTR mentions the standard. If you are looking for additional testing such as tensile / hardness / impact properties - check to see if these tests have been completed. Also if you are looking for Non destructive testing such as Ultrasonic / Magnetic particle / Dye Penetrant inspection it will be mentioned on the MTR. The MTR will have a heat / lot number mentioned and the testing will be done for that heat / lot.

Importantly, if you do not trust the manufacturer do not buy from the manufacturer. As a part of your incoming material inspection, you can perform your own testing on a sample from the lot to verify that the material meets your requirements with regards to chemical and mechanical testing. This is money well spent. I have rejected materials based on independent test results not meeting the standard.


--------------------------------------
There is always some thing better out there...
Mahadhatu

 

[EdStainless]

I second the comments about testing. A company that does not have a sampling and retesting procedure is saying that they don't care if material meets specs or not.
Trust but verify still works.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[tbuelna]

A test report will only provide the results of testing required by your PO. If you require traceability all the way back to the original mill run the material came from, then you need to ask your supplier for a certificate of conformance and paperwork that documents the pedigree of the material. Just be prepared to pay handsomely for this level of documentation. Most common alloy raw materials like 316 cres go thru several types of processing from the time it leaves the mill until it ends up on your shipping dock.

Normally, tracing the material all the way back to the original mill run is unnecessary. All you are usually concerned about is the metallurgy/properties/quality of the material coming from the immediate supplier.