Monday, August 16, 2010

[MW:6515] dual certificate

dear all,
 
good day.
 
 what is the purpose of using a dual certified material.
 
 
 Example -  Plate  used for vessel fabrication as per ASME SEC VIII DIV1 is  dual certified as SA 516 GR 60 and SA 516GR70.
 
What will be the tensile strength of this plate and impact properties. whether these properties will be as per SA516 GR 60  OR sa 516 GR. 70.
 
Thanks in Advance.
 
Regards
 
Asad

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