Heat-Resistant Oil Casing Series – Product Introduction‌

‌Material Innovation‌
Engineered with Cr-Mo-V-Nb alloy steel and subjected to multi-stage heat treatment, this series maintains structural integrity at sustained temperatures up to 350°C. The microstructure refinement process enhances creep resistance while keeping hardness ≤22 HRC for sulfide stress cracking (SSC) resistance.

‌Performance Highlights‌

• ‌Thermal Stability‌: Demonstrated 5,000+ hours service life in 300°C geothermal wells
• ‌Mechanical Strength‌: Yield strength 550-758 MPa (API L80-P110 grades)7 with collapse pressure ≥69 MPa
• ‌Corrosion Protection‌: Optional internal Al-Si coating for H₂S/CO₂ environments

‌Certifications & Applications‌

• Complies with API 5CT PSL-3 standards for thermal cycling conditions
• Deployed in deep sour gas wells and steam injection recovery systems