1 | | | seamless steel oil pipe Specification: kinds of Detail: Specification Steel Grade Threads 4 1/2Ħħ, 11.6# J55, K55, N80, L80,P110 BTC, LTC, STC, 5Ħħ, 15# J55, K55, N80, L80,P110 BTC, LTC, STC, 5Ħħ, 18# J55, K55, N80, L80,P110 BTC, LTC, STC, 5 1/2Ħħ,17# J55, K55, N80, L80,P110 BT... |