Why we are going for A106Gr.B and not for A106Gr.A/C

[hiren3010]

I wanted to know why we r using the A106 Gr.B and not A106 Gr.A/C?
same is for A516 Gr.60.... this material is used in our company more frequently than A516 Gr.70...

Why it is so? why certain grades are more popular?
I wanted to know more about material selection.
can u help in that?

Thank u in advance.

 

[metengr]

Typically, material grades like the above are selected based on application, availability and cost of material. What is your application for using these materials?

 

[JStephen]

One of the differences in some of the grades will be notch toughness at lower temperatures- one reason for using A516-60 over A516-70, for example. In the case of pressure vessels, tanks, etc., this distinction is made in the design codes.