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Wednesday, March 25, 2009: 8:30 AM
C201 (Georgia World Congress Center)
Abstract
The interest of the use of high grade steel pipes for the construction of long distance pipelines is rapidly increasing, and it is expected to become the principal source, for deepwater applications. In response to this potential demand, TenarisTamsa steel makers have develop a new kind of steel. In the present work, an ultra high-strength steel grade that far exceeds the conventional grades of X65 and X80 has been studied in order to investigate the influence of minor alloying additions of nikel on the microstructural pattern on the corrosion behavior. Nickel can be used to raise strength of steel. This kind of steel can exhibit different corrosion responses at different locations due to nickel content and to the resulting differences on microstructural features. Electrochemical experiments further showed that nickel addition were detrimental to the corrosion resistance. The increase on nickel content has provided a microstructure refinement and a more extensive redistribution of the precipitation which has provoked a decrease on the corrosion resistance.
The interest of the use of high grade steel pipes for the construction of long distance pipelines is rapidly increasing, and it is expected to become the principal source, for deepwater applications. In response to this potential demand, TenarisTamsa steel makers have develop a new kind of steel. In the present work, an ultra high-strength steel grade that far exceeds the conventional grades of X65 and X80 has been studied in order to investigate the influence of minor alloying additions of nikel on the microstructural pattern on the corrosion behavior. Nickel can be used to raise strength of steel. This kind of steel can exhibit different corrosion responses at different locations due to nickel content and to the resulting differences on microstructural features. Electrochemical experiments further showed that nickel addition were detrimental to the corrosion resistance. The increase on nickel content has provided a microstructure refinement and a more extensive redistribution of the precipitation which has provoked a decrease on the corrosion resistance.