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Welded steel pipes with special requirements must meet strict dimensional tolerances, for example, the allowable deviation of cross-sectional dimensions is divided into ± 0.25mm to ± 0.8% edge length grades according to different levels of precision for ordinary and advanced grades. The allowable deviation range for wall thickness is from ± 12.5% to ± 10%, depending on the wall thickness value. In addition, there are clear regulations on the unevenness, curvature, and torsion values of steel pipe edges,
keyword MSZ 3770 Category Steel pipe standards Related products Get a quoteMSZ 3770 welded steel pipes with special requirements
MSZ 3770 "Welded Steel Pipes with Special Requirements" is a specialized standard for the production and inspection of welded steel pipes,
Technical parameters and size requirements
Welded steel pipes with special requirements must meet strict dimensional tolerances, for example, the allowable deviation of cross-sectional dimensions is divided into ± 0.25mm to ± 0.8% edge length grades according to different levels of precision for ordinary and advanced grades. The allowable deviation range for wall thickness is from ± 12.5% to ± 10%, depending on the wall thickness value. In addition, there are clear regulations on the concavity, curvature, and torsion values of the steel pipe edges, and the geometric accuracy meets the engineering requirements.
Inspection and acceptance standards
Before leaving the factory, steel pipes need to undergo water pressure tests, bending tests, and flattening tests to ensure strength and sealing. The weld seam needs to undergo 100% non-destructive testing, and the overall curvature should not exceed 0.3% L (ordinary grade) or 0.2% L (advanced grade). The end needs to be vertically cut and deburred, and the allowable deviation for the fixed length is 0~+10mm. The document acceptance should include the original material list and process parameter records.
(Note: Parameters may be adjusted due to engineering requirements;)
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