Offshore drilling marine riser resistant to deepwater conquassation and manufacturing method of offshore drilling marine riser
A technology for offshore drilling and risers, which is applied in the direction of drill pipes, drilling equipment, drill pipes, etc., and can solve problems such as large ovality of steel pipes, low toughness of welded joints, and reduced crush resistance of steel pipes
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[0039] Combining the manufacturing examples of Φ533.4mm×15.9mm and Φ533.4mm×25.4mm anti-deep water crushing marine drilling risers, the embodiments of the present invention are as follows:
[0040] 1. The marine drilling riser pipe material with anti-deep water crushing contains C: 0.04%, Si: 0.14%, Mn: 1.78%, P: 0.012%, S: 0.002%, Ni: 0.22%, Cr: 0.23 according to the mass percentage %, Cu: 0.18%, Mo: 0.20%, Nb: 0.06%, V: 0.04%, Ti: 0.012%, Al: 0.02% to 0.06%, N: 0.005%, B: 0.0003%, Ca: 0.002%, Ti / N: 2.4, Nb+V+Ti=0.112%, the balance is Fe and unavoidable impurities, its welding crack sensitivity index Pcm=0.17, the microstructure of the pipe is mainly composed of ferrite and bainite Composite fine-grained structure (such as figure 1 Shown), the bainite fraction is above 80%. The pipe has the characteristics of high strength, high toughness, corrosion resistance and good weldability.
[0041] 2. Manufacture of deep-water fracturing-resistant marine drilling riser LSA welded ...
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