hot-rolled steel pipe ASTM A 53 Grade B black and hot-dipped galvanized welded and seamless steel pipe ... class, prime, newly produced, secondary , stock etc.Material/steel gradeA, B, X42, X46, X52, X56, X60, X65, X70, L175, L175P, L210 ... and pressure service etc. hot-rolled steel pipe ASTM A 53 Grade B