... 3),Length:4-10m 4),Surfance Treatment:oiled 5),Teachnique:seamless steel tube/pipe 1), Grade:10#-45#, Q195-Q345,16Mn2 ... ), OD:30-210mm3),Length:4-10m4),Surfance Treatment:oiled5),Teachnique:seamless Specialized high quality steelWe have the advantages of equipment, technologies ...