oil casings 1) Standards: ASTM/ASME ,GB,JIS,DIN,API5L, 2) O.D:4 1/2''-20''mm 3) W.T.:0.205-0.352'' 4) Length :R2.R3 oil casingsOil casings specification: Standard : API5L API5CT /ASTM/EN/DIN/GBPlace of origion baotou, inner mongolia.PRC.CHINAMaterial:J55,K55,N80(N80-1.N80Q),L80-1.C90,P110.Outside diameter114.3-339.7MM 4 1/2''-20''Thinkness:5.69-12.19MM 0.205-0.635''Length R2 or R3Payment L/C or T ...