API 5CT product portfolio integrates all mainstream steel grades including J55, K55, N80, L80, P110 and corrosion-resistant L80 3Cr, with outer diameters ranging from 2-3/8" to 13-3/8".

All tubulars undergo strict factory tests including hydrostatic pressure testing, ultrasonic non-destructive flaw detection, tensile & collapse resistance mechanical verification, and full material chemical analysis, to guarantee traceability and stable performance under extreme downhole conditions such as high pressure, high temperature and corrosive fluid environments.

As an API Q1 & API 5CT certified manufacturer, Dongfanglong has upgraded its whole production line to meet the updated clauses of API 5CT 11th Edition, including streamlined Product Specification Levels (PSLs), advanced automated inspection workflows and updated impact energy requirements for heavy-wall pipes.

Equipped with automated seamless pipe rolling, CNC precision threading and digital heat treatment workshops, the factory maintains stable dimensional tolerances for wall thickness, thread pitch and coupling length. Both imperial (ppf) and metric (kg/m) dimension series are available to satisfy global clients’ tender and design demands across Europe, Southeast Asia, the Middle East and South Asia.

With the global energy industry expanding deep well and unconventional oil & gas development, demand for high-standard API 5CT OCTG keeps rising. Dongfanglong provides one-stop customized service: tailor-made wall thickness, special thread length, coating treatment and flexible packaging solutions according to clients’ well design parameters.

Our technical team can offer professional parameter consultation on casing/tubing selection, joint tensile capacity and mechanical property calculation (inertia moment, section modulus, radius of gyration) to help clients optimize well string safety and lower overall project costs. Full sets of product certificates, mill test reports and API monogram documents will be provided with every shipment.