ProjEngKLS,
FYI, I just had to switch from 4" Sch 160 A106 Gr. B pipe to 4" Sch 160 A333 Gr. 6 pipe for a project (due to low impact and shear results on the A106) and the cost delta was about $4/foot in the good direction! This cost delta is only for the pipe, but as we needed weld...