الوصف

We're manufacture of Drill Pipe, Casing, Tubing, Drill Collar and Heavy Weight Drill Pipe in China; Our company is an API Spec 5D、API Spec 7、API Spec Q1、API Spec 5CT、ISO ***1:***0、ISO/TS ****1 certified manufacturer; Drill Pipe Steel Grade: E**5, X**5, G***5 and S***5; Sizes from 2 3/8" to 5 1/2"; Length: R1, R2, R3; Connection Type: API, AOH, WT, HT, PAC and so on; Harabanding Type: Chang Gang's patent Integral Hardbanding; Thread Galling and Fracture Preventable Technology; Internal Coating with higher adhesive force & abrasive resistance.