large diameter seamless pipe

The delivery state of seamless steel pipe. The delivery state of hot-rolled seamless steel pipes is generally in the hot-rolled state after heat treatment. After passing the quality inspection, the hot-rolled seamless steel pipe must undergo strict manual selection by the staff. After the quality inspection, the surface must be oiled, followed by multiple cold-drawing experiments. After the hot-rolling treatment, a perforation experiment must be performed. , if the diameter of the perforation is too large, it needs to be straightened and corrected. After straightening, it is transferred by the transmission device to the flaw detection machine for flaw detection experiments. Finally, it is labeled, arranged in specifications, and placed in the warehouse. Round tube blank → heating → piercing → three-roll cross rolling, continuous rolling or extrusion → tube removal → sizing (or diameter reduction) → cooling → straightening → hydraulic test (or fla…