What are the manufacturing methods of stainless steel seamless pipe production!

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What are the manufacturing methods of stainless steel seamless pipe production!

2020-06-18 H:44:11
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    According to the different production methods, it can be divided into hot-rolled pipe, cold-rolled pipe, cold drawn pipe, extruded pipe, etc. 1. Hot rolled stainless steel seamless pipe is usually produced on automatic pipe mill. After checking the surface defects, the solid tube blank is cut into the required length, centered on the end face of the piercing end of the tube blank, then sent to the heating furnace for heating piercing on the piercing machine. With the continuous rotation advance of piercing, a cavity is gradually formed in the tube blank under the action of roller plug, which is called capillary tube. Then it is sent to the automatic pipe rolling machine to continue rolling. Then, the whole wall thickness is adjusted by the whole machine the diameter is determined by the sizing machine to meet the specification requirements. It is a more advanced method to produce hot-rolled seamless steel tube by using continuous tube rolling unit. 2. If we want to get smaller size better quality seamless pipe, we should use cold rolling, cold drawing a combination of both. Cold rolling is usually carried out on a two high mill. The steel tube is rolled through a circular channel consisting of a variable cross-section circular hole groove a fixed conical head. Cold drawing is usually carried out on 0.5-100t single chain double chain cold drawing machine. 3. The extrusion method is to put the heated tube blank into a closed extrusion cylinder. The piercing rod the extrusion rod move together to extrude the extrudate the smaller die hole. This method can produce small diameter steel pipe. This kind of steel pipe can be divided into two categories: stainless steel seamless steel pipe stainless steel welded steel pipe. According to the manufacturing process, it can be divided into several basic types: hot rolling, extrusion, cold drawing cold rolling. The shape can be divided into round pipe special-shaped pipe. Round steel pipe is widely used, but there are also some special-shaped stainless steel pipes such as square, rectangular, semicircular, hexagon, equilateral triangle, octagon so on. For the steel pipe under fluid pressure, hydraulic test is needed to check its pressure resistance quality. No leakage, wetting expansion is acceptable under the specified pressure. Some steel pipes also need to be tested according to the standard the requirements of the demander. Flaring test, flattening test. Seamless stainless steel tube, also known as stainless steel seamless pipe, is a capillary tube made of steel ingot solid tube blank through perforation, then hot rolled, cold rolled cold drawn. The specification of seamless steel pipe is expressed by outer diameter × wall thickness (mm).


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