... 5Thread:BTC,STC,LTC Oil casing pipeHuadong Industrial CO., LTD mainly engaged in the Casing ,Tubing and Slot pipe, ... Pipe.Annual output near 200,000 Ton. Oil casing pipe rang:Casing pipe from 4 1/2" to 20" , ... cooperate with each other. It mainly engaged in the Casing ,Tubing and Slot pipe,Screen pipe and Large ... .Annual output near 200,000 Ton. The Product Rang:Casing pipe from 4 1/2" to 20" ,Tubing ...