... R3 length can be manufactured by customers' requirements.7)Type of ends: BTC,LTC,STC;NUE,EUE8)Surface Treatment: Oil-dip ... )Coupling,Pup-joint and thread protector can be required10)Type of process: seamless or ERW11)Application: Conveying gas,water,and oil ... : USA,UK,Italy,Germany,Hongkong,India,Iran,Singapore,Malaysia,Thailand,South Korea,Japan,Egypt,Yemen,Saudi Arabia,Kuwait,Czech,Indonesia and other ...