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Austenitic-ferritic stainless steels, commonly known as duplex stainless steels (DSSs), are a group of materials typically consisting of equal amounts austenite and ferrite. DSSs are well-known materials in chemical industry and are often a cost-effective alternative as they combine high mechanical strength and fatigue resistance with good corrosion properties. Contributing to the cost-effectiveness is the low nickel content compared to austenitic stainless steels. Advantages with DSSs are high chloride stress corrosion cracking resistance (SCC), where austenitic steels with moderate nickel content are inherently more sensitive. In combinations with carbon steel it can be a benefit to use DSSs since carbon steel and DSSs have matching thermal expansion.
Super and hyper duplex stainless steels (DSSs) are well-known materials in chemical industry. DSSs are characterized by excellent chloride stress corrosion resistance, very high mechanical strength, excellent resistance to pitting and crevice corrosion. The duplex structure also gives design advantages compared to austenitic stainless steels since the thermal expansion matches carbon steels.
However, DSSs are often optimized for chloride resistance, and therefore the performance in acid environments can be a limitation.
The recently developed UNS S83071 has been optimized for general corrosion resistance, which gives benefits where traditional super duplex grades suffer from high corrosion rates due to general corrosion. The composition is 30Cr-7Ni-3.5Mo-N, and the material is characterized by excellent acid corrosion resistance with the traditional benefits of DSSs, in combination with good structure stability and weldability.
This paper presents the results from general corrosion testing in acid environments and the results from standardized corrosion testing methods. The results show that UNS S83071 has excellent general corrosion resistance as well as excellent resistance to pitting and crevice corrosion, making it suitable to be used in demanding environments, such as acid production plants with or without seawater cooling.
Carbon capture, utilization and storage (CCUS) is one of the key technologies to achieve the net-zero emission. One of the CCUS method is CO2 injection to depleted oil and gas wells or aquifers and storage (CCS). The CO2 emitted from fossil fuel-based powers and industrial plants are captured and transported to the injection point by ships or pipe line. Following that, the dense phase or supercritical phase CO2 will be injected to depleted oil and gas wells or aquifers through oil country tubular goods, for examples, seamless pipe.
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Pipelines have been the main transportation pattern of oil and gas because of their safety and economy, which are considered as the lifeline of offshore oil and gas transportation. With the booming development of offshore oil industry, the frequency of pipeline leakage is also increasing. Corrosion is one of the important factors due to some characteristics such as operating environment, service life and transportation medium, etc., which damages the integrity of the pipeline and damage the normal operation of pipelines. Furthermore, leakage accidents caused by pipeline corrosion have occurred all over the world, accounting for 70~90% of total accidents, which has caused huge economy losses and catastrophic environmental damage.
In 1950s, as an important measure to improve the corrosion resistance of base metal, internal coating pipes was first applied to sour crude oil and natural gas pipelines [1]. Among the coating systems, FBE coating has good impact resistance, bending resistance, high bonding strength, good resistance for acid, alkali, salt, oil and water fluid. The coating can reduce the internal surface roughness friction resistance of piping & pipeline to reduce project investment.