We used a lot of S355J2, St52.3, & EH36 for main structure. We also used A36 & SS400 for non-critical structure which are welded to the main structure. Out of curiosity, I checked into these two welding codes. Only SA36 & EH36 (AWS D1.1) are 'officially' listed in these code. 1) We have WPS for S355J2 to S355J2.
Pipe Manufacturing Process / Methods for Seamless & A welded pipe can be manufactured in large sizes without any upper restriction. Welded pipe with filler material can be used in the manufacturing of long radius bends and elbow. Welded pipes are cheaper with compared to the seamless pipe and also Weak due to the weld. There are different welding methods used to weld the pipe. ERW- Electric