High-strength and carbon dioxide corrosion-resistant tubing and casing and manufacturing method therefor
A high-strength petroleum casing pipe with a tailored chemical composition and manufacturing process addresses the challenge of carbon dioxide corrosion, achieving superior mechanical properties and corrosion resistance, ensuring long service life.
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- BAOSHAN IRON & STEEL CO LTD
- Filing Date
- 2024-08-08
- Publication Date
- 2026-06-17
AI Technical Summary
Existing petroleum casing pipes face challenges in achieving both ultra-high strength and carbon dioxide corrosion resistance, particularly due to the high cost and limited performance of materials like 13Cr steel and Ni-based alloys, and low-alloy 3Cr series pipes fail to meet the 110 ksi steel grade requirements.
A high-strength petroleum casing pipe with a rational chemical element composition comprising C: 0.10-0.20%, Si: 0.10-0.80%, Mn: 0.10-1.50%, Cr: 3-5%, Mo: 0.10-0.70%, Al: 0.01-0.10%, V: 0.10-0.20%, Ni: 0.1-1.0%, Ce: 0.002~0.01%, and La: 0.002~0.01%, along with a manufacturing process involving smelting, continuous casting, quenching, and tempering, to enhance corrosion resistance and mechanical properties.
The solution achieves a yield strength of 965-1173 MPa, tensile strength of ≥1034 MPa, and transverse Charpy impact energy of ≥80 J, with a uniform corrosion rate of ≤2.5 mm/a, significantly extending the service life of the casing tube.
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