... , X52, X56, X60, X65, X70,X80, H40, J55, N80 Size Range: OD 21.3mm-630mm,thickness 1.8mm-20mm Specification Table ... √√√√√√√√√√√ 406.4 √√√√√√√√√√√ 457.2 √√√√√√√√√√√ 508.0 √√√√√√√√√√√√558.9 √√√√√√√√√√√609.6 √√√√√√√√√√√ Electric Resistance Welding Steel Pipe