Monday, November 30, 2015

[MW:23935] Niobium in SA 516 GR 70 PLATE

Dear Experts ,

We intend to use SA 516 GR 70 plate - (thickness ranging from  55mm to 100 mm)  for   steam boiler application.
We are getting plates with Niobium content of 0.04 %.
As per SA 20   corresponding table ,the maximum limit for Nb  is 0.02 %
How ever , in the notes of the said Table  the Nb can be increased
What is effect of increase,  in Nb element on boiler drum shell rolling and  welding


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