Grade of MATERIAL

[Ali Asghari]

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" <asghar...@gmail.com>
Date: Aug 21, 2015 7:34 AM
Subject: UNKNOWN MATERIAL
To: <material...@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. 

[Alan Denney]

Ask to see the original pipe mill certificates and check that the manufacturer has supplied the material, and certificated it to the requirements of API 5L grade X52. [There is a lot more than just yield strength in supply of a certain grade of line pipe.] and yes, you are right, the material, as specified, is permitted to have a range of yield strength.

 

Alan Denney

AKD Materials Consulting Ltd

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[meisam shokri arfaei]

Dear Ali

1 - Please check chemical analysis of tested samples. Specially carbon content and also carbon equivalent provides more data for grade identification. It should be with regards to that, if those pipe are welded or seamless. 

2 - Review sampling position, number of samples and their standard type (rectangular or round) according to the standard.

3 - For PSL2 there is more tests defined in the standard for better grade identification, however those tests are for certifying PSL2 and have not been defined for grade details, but they may help you to find the best matched grade.

4 - Eventually, it is probable that the pipe covers 1, 2 or more grades. The permission for use should be based on engineering data. For example, lower carbon equivalent is better for welding and higher cavbon equivalent may cause using pre-heat and PWHT.

Regards

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M. Shokri Arfaei

ISA-ISTS - Metallurgy Lab. Manager

ASNT NDT Level III

International Welding Engineer

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Mob.:+98 912 1394023

[Ali Asghari]

Dear Alan and Meisam
Thank you for your responses.
In API 5L chemical analysis of X60 and X 52 even X65 are very similar especially in carbon equivalent and because this material want to be used in structure dosen't matter PSL1 or 2.
Original certificate issued for X60.
But i don't understand why standard defines these grades that don't differ much and with regard to in designing step usually you choose higher grade to decrease thickness,but in this case there isn't any benefit.
Additionally in AWsD1.1 X52 in group2 and X60 in group 3 and we have approved wps for group2.
Is it possible that contractor use from API 5L and designate this material to X52?
Regards

[Alan Denney]

Dear Ali

 

I understand:

·        that you have a welding procedure qualified on X52 and you want to apply it to X60 material,

·        you are working to AWS D1.1 and because they are in separate material groups you cannot do it and be code compliant.

 

You need to apply to your client for a concession. The grounds for that would be that the material you want to weld is of equivalent weldability to the material qualified in the procedure. You need to look at the chemical analysis and the IIW carbon equivalent and show that they are broadly equivalent.

 

Good luck with this.

 

Best wishes

 

Alan

 

Alan Denney                                                                                                                              

AKD Materials Consulting Ltd

 

 

-----Original Message-----
From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Ali Asghari

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