diffference between ASTMA435 and ASTM A578 1

[rezapayman]

Hi
I would like to know what is a difference between ASTM A435 and ASTM A578?.I am reviewing an pressure vessel spec and i should decide to choose one of this standards to notify.
best wishes

 

[SJones]

Just to start you off in your standards selection review exercise: A435 is for steel plate and A578 is for alloy clad steel plate.

Steve Jones
Materials & Corrosion Engineer

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

 

[ulyssess]

A578 is not only applicable to alloy clad plate but can also be applied to "normal" plate. A578 has 3 different acceptance levels (A, B, C). The allowable size of discontinuities for Level A is comparable to the acceptance level of A435. Level B is slighly more severe, Level C is much more severe.
ASME VIII Division 2 edition 2007 par. 3.3.3 requires ASTM A578 Level B for plate thicknesses >= 50mm.