API 5L X52 Seamless tube

　　Requirements for API 5L X52 seamless tube in standard

　　1. there are no cracks, wrinkles, wrinkles, spalling, crusts and scales on the inside and outside surfaces of the steel pipes. These defects should be completely eliminated. The grinding of surface defects should be smooth and smooth. The depth of clearance should not exceed the negative deviation of nominal wall thickness. The actual thickness of the defect removal zone should not be less than the minimum allowable wall thickness of the steel tube. The welding method should not be used.

　　2. the straight path of the inside and outside surface of the steel pipe must be grind. The depth of clearance should not exceed the negative deviation of nominal wall thickness. The actual thickness of the defect clearance area should not be less than the allowable minimum wall thickness of the steel pipe.

　　3. end shape: cut both ends of the steel pipe into right angles and remove burrs.

　　The welding interface is not allowed on the 4. pipe.

　　Dimension tolerance of API 5L X52 seamless tube

　　1. diameter and ellipticity

　　Diameter deviation: + 0.01D, maximum not more than + 4mm;

　　Ellipse deviation: 0.02D, maximum 10mm.

　　2. wall thickness deviation

　　The deviation of steel tube wall thickness is -5% ~ + 20%, but the average wall thickness of each steel pipe must not be lower than the specified wall thickness.

　　3. steel pipe straightness deviation

　　One. The total deviation of the total length of the steel pipe relative to the straight line should be less than 0.2% of the length of the steel pipe.

　　Within the length of each pipe segment of the 1000mm, the local deviation of the line should be less than 4mm.

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