hot-rolled steel pipe ASTM A 53 Grade B black and hot-dipped galvanized welded and seamless steel ... class, prime, newly produced, secondary , stock etc.Material/steel gradeA, B, X42, X46, X52, X56, X60, X65, X70, L175, L175P, ... in which the steel cylinder acts as a permanent load-carrying member, or as a shell to form cast-in-place ... and pressure service etc. hot-rolled steel pipe ASTM A 53 Grade B