The production process of general seamless steel pipes […]
The production process of general seamless steel pipes can be divided into two types: cold-drawn and hot-rolled. The production process of cold-rolled seamless steel pipes is generally more complicated than hot-rolled.
The tube blank must first be subjected to three-roll continuous rolling, and the sizing test shall be carried out after extrusion. If the surface does not respond to cracks, the tube shall be cut by a cutting machine and cut into a blank of about one meter in length. Then enter the annealing process. Annealing needs to be pickled with an acidic liquid. When pickling, pay attention to whether there are a lot of bubbles on the surface. If there are a lot of bubbles, it means that the quality of the steel pipe does not meet the corresponding standards.
In appearance, cold-rolled seamless steel pipes are shorter than hot-rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally smaller than that of hot-rolled seamless steel pipes, but the surface looks brighter than thick-walled seamless steel pipes. Much rough, without too many burrs on the caliber.
The delivery state of hot-rolled seamless steel pipes is generally delivered after heat treatment in the hot-rolled state. After the quality inspection, the hot-rolled seamless steel pipe must be strictly hand-selected by the staff. After the quality inspection, the surface must be oiled, and then followed by multiple cold drawing experiments. After the hot-rolling treatment, the piercing experiment must be carried out. , If the perforation is too large, it must be straightened. After straightening, it is transferred by the conveyor to the flaw detector for the flaw detection experiment, and finally the label is affixed, the specifications are arranged and then placed in the warehouse.
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