Rust grade is about the surface before cleaning
ST3 is the cleanliness grade after cleaning
And it doesnt matter what kind of material is the substrate unless the group is the same
I mean A537 is still a carbon steel and shall not be treated otherwise.
if it was stainless or Cr-Mo steel maybe but A537 is still a carbon steel and shall be treated accordingly.
Ramin Kondori 
QC/Welding Engineer
IWE AT 0070
On Sat, Jul 16, 2011 at 2:33 PM, Suresh <bobsuresh24@gmail.com> wrote:
Dear All ,Could you please confirm that what is the rust grade in st3 profile for A 537 CL1 material ..means grades are allocated for st3 B/C/D ...which grade can be suitable for 537 CL 1 Material ...B? C? D? , Please show some copy or spec .Thank you for your time ....--
Suresh
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