How is seamless steel pipe produced?
The production process of seamless Steel Pipes is relatively rich, usually processed and produced according to corresponding steps:
¢Ù The main production processes of hot-rolled seamless steel pipes (¡÷ main inspection processes):
Preparation and inspection of pipe blank ¡÷ ¡ú Heating of pipe blank ¡ú Perforation ¡ú Rolling of pipe ¡ú Reheating of steel pipe ¡ú Sizing (reduction) ¡ú Heat treatment ¡÷ ¡ú Straightening of finished pipe ¡ú Finishing ¡ú Inspection ¡÷ (non-destructive, physical and chemical, bench inspection) ¡ú Warehousing
¢Ú The main production processes of cold rolled (drawn) seamless steel pipes are:
Blank preparation ¡ú Acid cleaning and lubrication ¡ú Cold rolling (drawing) ¡ú Heat treatment ¡ú Straightening ¡ú Finishing ¡ú Inspection
The production process of general seamless steel pipes can be divided into two types: cold drawing and hot rolling. The production process of cold rolled seamless steel pipes is generally more complex than hot rolling. The pipe blank first needs to undergo three-roll continuous rolling, and after extrusion, it needs to undergo diameter testing. If there are no response cracks on the surface, the round pipe needs to be cut by a cutting machine, cutting a billet with a length of about one meter. Then enter the annealing process, where acidic liquid is used for pickling. During pickling, attention should be paid to whether there is a large amount of blistering on the surface. If there is a large amount of blistering, it indicates that the quality of the steel pipe does not meet the corresponding standards. The appearance of cold-rolled seamless steel pipes is shorter than that of 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, with no too much roughness on the surface and no too many burrs on the diameter.
Seamless steel pipes have a wide range of uses, so when using them, it is important to pay attention to quality characteristics and make reasonable choices!
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