hot-rolled steel pipe ASTM A 53 Grade B black and hot-dipped galvanized welded and ... , L175P, L210, L245, L290, L320, L360, L390, L415, L450, L485, BR, X42R, BN, X42N, X46N, X52N, X56N, X60N, BM, X42M, X46M ... in which the steel cylinder acts as a permanent load-carrying member, or as a shell to form cast-in-place concrete ... purpose and pressure service etc. hot-rolled steel pipe ASTM A 53 Grade B