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// The importance of the API 5L Oil Pipeline   // Steel pipe can be divided by cross-sectional shape   // The classification of Steel pipe   // Tolerance of steel pipes   // ASME SA213 T11 Seamless Steel Pipe   // Hardness unit of API 5L Gr. B Welded Steel pipe   // API 5L Grade B X42 Seamless steel pipe   // ASTM A252 Spiral Steel Pipe   // ASTM A179 Seamless Steel Boiler Pipe   // API 5L X46 Oil Pipeline  

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