API Tubing & Casing

Steel Grades for OCTG

Engineered to withstand the most demanding subterranean environments, our comprehensive range of Oil Country Tubular Goods (OCTG) delivers uncompromising structural integrity for complex drilling operations. We manufacture a complete portfolio of API 5CT tubing and casing, alongside highly specialized non-API grades tailored for distinct geological challenges. The manufacturing process leverages advanced tube-end upsetting, precise austenitizing, and rigorous quench-and-temper heat treatments. This thermal processing refines the steel microstructure, significantly enhancing the combined mechanical properties of collapse resistance and tensile strength. Furthermore, our threading capabilities encompass standard API connections—such as STC (Short Thread Casing), LTC (Long Thread Casing), BTC (Buttress Thread Casing), NUE (Non-Upset Tubing), and EUE (External Upset Tubing)—as well as premium gas-tight connections. Each thread is precision-machined and treated with advanced phosphating for superior anti-galling and corrosion protection, ensuring a flawless, leak-proof seal even under extreme downhole pressures and severe bending loads.

API Grades

Compliance and reliability form the foundation of our standard tubing and casing offerings. We produce all API steel grades across Product Specification Levels (PSL) 1, 2, and 3, precisely incorporating any necessary Supplementary Requirements (SR) dictated by your specific project parameters. Operating under a stringent ISO 9001 quality management framework, our production lines strictly adhere to API 5CT international standards. Every single tubular product undergoes a rigorous, full-cycle inspection protocol before it leaves the facility. This comprehensive quality control system includes advanced Non-Destructive Testing (NDT) such as ultrasonic and electromagnetic inspections to detect minute internal anomalies. Additionally, we perform mandatory hydrostatic pressure tests, full-length drift diameter verifications, and 100% thread gauging. By maintaining these uncompromising inspection standards, we guarantee zero-defect delivery, backed by complete Material Test Certificates (MTC) and support for third-party verification, ensuring absolute regulatory compliance for global drilling projects.

Proprietary Grades

Beyond standard specifications, we recognize that unique reservoir conditions often demand specialized metallurgical solutions. We proudly manufacture a diverse array of proprietary steel grades designed to conquer extreme downhole environments where conventional materials fall short. Our engineering team provides extensive OEM and ODM customization services, developing exclusive tubular solutions matched to your specific oilfield geology. Whether your project requires non-standard outer diameters, specialized wall thicknesses—ranging from ultra-thin profiles to heavy-wall configurations—or proprietary alloy compositions, we deliver precise engineering. These custom formulations are meticulously developed to balance ductility, yield strength, and environmental resistance, providing operators with a reliable conduit for surface casing, technical casing, and production tubing applications in highly challenging extraction scenarios.

High Properties:

Our high-property casing series is engineered to maintain structural stability under severe mechanical stress and extreme temperature variations.

• High-collapse Casing: Designed with exceptionally tight tolerances and optimized yield strength to resist crushing forces in ultra-deep wells and active tectonic zones.

• High-ductility Casing: Formulated to absorb significant deformation without fracturing, making it ideal for directional drilling, horizontal wells, and areas prone to seismic shifts.

• Thermal Application Casing: Thermally stabilized to prevent yield strength reduction and structural fatigue during cyclic steam stimulation (CSS) and steam-assisted gravity drainage (SAGD) heavy oil recovery operations.

• Low Temperature Application Casing: Metallurgically balanced to retain exceptional impact toughness and prevent brittle fracture in arctic drilling environments and permafrost regions, ensuring safe operation in sub-zero climates.

Corrosive Application Use:

Sour gas and highly corrosive fluids require specialized metallurgy to prevent catastrophic failure from sulfide stress cracking (SSC) and weight-loss corrosion. Our corrosive application line provides formidable protection:

• H2S Resistance Casing: Features a highly refined, uniform martensitic microstructure with tightly controlled hardness levels, specifically engineered to thwart hydrogen embrittlement in sour well environments.

• High-collapse + H2S Resistance Casing: A dual-performance tubular that combines superior external pressure resistance with anti-sour gas properties, essential for deep, high-pressure sour reservoirs.

• CO2 Resistance Alloy Casing: Utilizing advanced Chromium (Cr) alloy compositions (including 1Cr, 3Cr, 9Cr, 11Cr, and 13Cr), these tubulars form a dense, passive oxide layer on the steel surface. This protective barrier effectively neutralizes the corrosive effects of wet carbon dioxide, extending the operational lifespan of the wellbore in highly corrosive extraction scenarios.

Product Specifications, Packaging & Global Logistics

Protecting the integrity of precision-machined threads and premium steel surfaces during transit is just as critical as the manufacturing process itself. Every joint of tubing and casing is equipped with heavy-duty, impact-resistant thread protectors on both the pin and box ends. The external surfaces are coated with a specialized, environmentally safe anti-corrosion varnish that shields the metal from atmospheric moisture and saltwater spray during extended maritime voyages. For secure handling and global logistics, the tubulars are tightly bundled using high-tensile steel strapping and reinforced with wooden dunnage to prevent metal-to-metal contact and deformation. This durable packaging configuration is fully optimized for multimodal transport, ensuring safe, punctual delivery to any remote drilling site or offshore platform worldwide. Product Specifications: For detailed dimensional data, proprietary steel grade consultations, or specific engineering requirements, please consult online customer service.