[MW:23347] Grade of MATERIAL

Dear All.
In material specification such as API 5L, minimum yield strength specified (in some cases maximum yield strength also given) that cause a wide range that overlaps with other grades.

Now with regard to attached  mechanical testing  result of some materials, contractor insist that these materials are X52(due to their wps can support them) but strength of them is near to X60 and X65.
How it could be clarified?

Regards.

---------- Forwarded message ----------
From: "Ali Asghari" <asgharialigl@gmail.com>
Date: Aug 21, 2015 7:34 AM
Subject: UNKNOWN MATERIAL
To: <materials-welding@googlegroups.com>
Cc:

Dear All.

In material specification such as API 5L, minimum yield strength specified (in some cases maximum yield strength also given) that cause a wide range that overlaps with other grades.

Now with regard to attached  mechanical testing  result of some materials, contractor insist that these materials are X52(due to their wps can support them) but strength of them is near to X60 and X65.

How it could be clarified?

Regards. 

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