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Steel grade

Date:2023-05-12View:279Tags:stainless seamless pipe,api 5ct pipe,stainless welded pipe

The delivery pressure of pipeline medium has a tendency to increased gradually, particularly evident in the pipeline online. This is because in a certain range to improve delivery pressure will increase the economic benefits to gas lines, for example, the amount of change in the input conditions, the gas is increased as the delivery pressure increases the density of the flow decreases, so that the friction decreased.

When the input amount determined by optimizing determined diameter, pressure, pressure than later, such as selecting a higher strength grades of steel pressure is too low, it will cause the wall thickness is too large, which gives the pipe, on-site welding and transportation and many other links with be difficult, or even difficult to achieve. Facilitate the needs of production of steel level of increase.

Reinforcement different levels, because the chemical composition of different steel, chemical composition different, also caused its mechanical index different. API released in 1926 APl5L standards, initially including A25, A, B three kinds of steel grade, the minimum yield values were 172, 207, 251MPa. API released in 1947 APl5LX standard, which adds X42, X46, X52 three kinds of steel grade, the minimum yield values were 289, 317, 358MPa. 1966, has released X56, X60, X65, X70 four kinds of steel grade, the minimum yield values were 386, 413, 448, 482MPa. 1972 API U80, U100 standard, the minimum yield values were 551, 691Mpa, after the API in turn U80, U100 changed to X80, X100. Rough statistics, the amount of the world before 2000, about 40% X70, X65, X60 are hovering around 30%, small-diameter oil pipeline is also a considerable number of X52 steel grade selection, and ERW steel pipe.

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