Breakthrough Of Corrosion Resistance Pipeline Tube
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Breakthrough Of Corrosion Resistance Pipeline Tube

Oil and gas sea bottom and land transport steel pipe are called pipeline tube.

Conveying and flow pipe exposed to corrosive environment generally use thick wall seamless steel pipe; While long distance conveying main pipes general use large diameter welded steel pipe.

Due to the stress of the pipeline tube is generally lower than that of the oil well pipe, so on the condition of low strength steel and fluid containing H2S, in addition to sulfide stress cracking happens, still exists the problem of hydrogen induced cracking.

Hydrogen induced cracking is due to the rolling of thick wall center segregation and inclusions in the hardening of the tissue, thus taking the measures of desulfurization and decalcification treatment to control inclusions morphology and reduce the C, P, Mn to reduce the segregation.

In the sea bottom oilfield development, from the perspective of lower development costs, underwater finishing well has a tendency to increase, from wellheads to equipped with dehydration, desulfurization processing equipment platform of the flow in the pipe, it is necessary to take measures to prevent the production of fluid and the corrosion of the water.

Ever using carbon steel for this part, and rust preventer is adopted to improve the corrosion resistance, but due to the seabed finishing well with rust preventive treatment cost is high, the environmental pollution problems exist, so use limited. Therefore, duplex stainless steel as the material has good corrosion resistance and can be used as a kind of welding material has aroused people's concern.

Composed of ferrite and austenite phase not only high strength, duplex stainless steel and welding, is a kind of cheaper than system of austenite stainless steel steel, and can obtain the same as the basic system of austenite stainless steel corrosion resistance, so it has the advantages to be suitable for the pipeline tube.

Initial conduit tube is good weldability 22 Cr system duplex stainless steel. Entering the 90s gradually developed super duplex stainless steel containing a lot of Mo, W and N .

In recent years, due to the cathodic corrosion protection and coating technology getting improved, so although the water resistance of markov system new 13 Cr steel with good weldability is worse than duplex stainless steel, under the condition of low CO2 + H2S also has good corrosion resistance, and can greatly reduce the cost of materials.

After the new 13 Cr steel reducing C content can prevent the following two kinds of crack: one is the crack because of the welding heat affected zone of martensite phase hardening; Another kind is the crack caused by the dissolved hydrogen in the welded metal.

Super duplex stainless steel and new 13 Cr steel as newly developed material, its join to the pipeline tube, no matter for seamless steel pipe and welded steel pipe, is surely worthy expecting to improve the corrosion resistance.


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