How is thick-walled seamless steel pipe produced

A steel pipe made of a single piece of metal with no seams on the surface is called seamless steel pipe, whose commonly used specifications include ASTM A53, ASTM A106, ASTM A500, ect. The manufacturing process of thick-walled seamless steel pipe production can be divided into four basic methods: cold drawing, cold rolling, hot rolling, and hot expansion.
Tools, raw materials: seamless steel pipe billet
Production steps
1. The general seamless steel pipe production process can be divided into cold drawing and hot rolling. The production process of cold rolled seamless steel pipe is generally more complicated than hot rolling. Sizing test, if the surface does not respond to cracks, the round pipe will be cut by a cutting machine and cut into a blank with a length of about one meter. Then enter the annealing process. Annealing should use acidic liquid for pickling. During pickling, pay attention to whether there is a lot of blistering on the surface. If there is a lot of blistering, it means that the quality of the steel pipe does not meet the response standard. The appearance of cold-rolled seamless steel tubes is shorter than that of hot-rolled seamless steel pipe. The wall thickness of cold-rolled seamless steel pipe is generally smaller than that of hot-rolled seamless steel pipe, but the surface looks brighter than thick-walled seamless steel pipe. It’s rough and doesn’t have too many burrs.
2.The delivery status of the hot-rolled seamless steel pipe is generally the hot-rolled state after heat treatment for delivery. After the quality inspection, the hot-rolled seamless steel pipe is strictly hand-selected by the staff. After the quality inspection, the surface is oiled, followed by multiple cold drawing experiments, and the piercing experiment is performed after the hot rolling treatment If the diameter of the perforation is too large, straightening and correction should be carried out. After straightening, it is transferred to the flaw detection machine by the conveyor to perform the flaw detection experiment. Finally, the label is attached, the specifications are arranged, and then placed in the warehouse.

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