Is it small-diameter pipes that are suitable for compression testing or large-diameter ones?

Owner: Regardless of the diameter, a flattening test must be conducted in accordance with the manufacturing standards; the only requirement is that as specified in GB/T8163, for diameters ranging from 22 to 400, the wall thickness/outer diameter ratio shall not exceed 10%； GB/T3087 requires that steel pipes with a diameter of 22–400 mm and a wall thickness of no more than 10 mm must undergo this treatment. Other standards such as GB/T9948, GB/T5310, and GB/T6479 also specify such requirements. As for whether it is suitable or not, it shall be determined in accordance with the definition in GB/T246. Normally, it is easier to conduct flattening tests on pipes with smaller diameters than those with larger diameters, as sampling is simpler and more straightforward. However, in terms of the directness and accuracy of defect analysis, larger diameter steel pipes are more effective.