... API 5CT N80 oil casing pipe 2.OD:6-760mm WT:1-30mm 3.Grade:J55,K55,L80,N80,P110 etc. 4.Thread ... :LTC,STC,BTC · API 5CT N80 oil casing pipe 1. Size:OD ... ,K55,L80,P110,C75,C95 etc.3. Standard:API 5CT & 5B4. thread type:STC,BTC,LTC5. brand name:TPCO6. Min ... tensile strength(MPa)hardness a Maxmm HRCMinMaxMinHRCHBVJ55379552517----N80552758689---- API 5CT N80 oil casing pipe