? Production technology of hot rolled steel pipe: 1. Main production procedures (main inspection procedures) of hot-rolled seamless steel tube: tube blank preparation and inspection → tube blank heating → piercing → tube rolling → tube reheating → sizing (reducing) → heat treatment → straightening of finished tube → finishing → inspection (nondestructive, physical and chemical, bench inspection)? → Storage 2. The main production processes of cold-rolled (drawn) seamless steel pipe: material preparation → pickling and lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection of seamless steel pipe. The general production processes can be divided into two types: cold drawing and hot rolling.
The production process of cold-rolled seamless steel pipe is generally more complicated than hot rolling. The tube blank should be rolled by three rollers first, and then the sizing test should be carried out after extrusion. If the surface does not respond to the crack, the pipe will be cut into a blank about one meter long with a cutting machine. And then enters the annealing process. When annealing, acid solution should be used for pickling. When pickling, pay attention to whether there are a lot of bubbles on the surface. If there are a lot of bubbles, the quality of steel pipe can't reach the corresponding standard. The appearance of cold-rolled seamless steel tube is shorter than that of hot-rolled seamless steel tube, and the wall thickness of cold-rolled seamless steel tube is generally smaller than that of hot-rolled seamless steel tube, but the surface looks brighter than that of thick-walled seamless steel tube, and the surface will not be too rough and the caliber will not have too many burrs.
After strict manual selection by the staff, the surface should be oiled after quality inspection, and then after many cold-drawn experiments, a perforation experiment should be carried out after hot rolling treatment. If the diameter of the perforation is too large, it should be straightened and corrected. After straightening, it is conveyed to the flaw detector by the conveying device for flaw detection experiment, and finally labeled, standardized and put into storage. Round tube blank → heating → piercing → three-roll skew rolling, continuous rolling or extrusion → tube stripping → sizing (or reducing) → cooling → straightening → hydrostatic test (or flaw detection) → marking → warehousing? Seamless steel pipe is made of steel ingot or solid tube blank through perforation, and then hot rolling, cold rolling or cold drawing. The specification of seamless steel pipe is expressed by outside diameter * wall thickness mm.
Generally, hot-rolled seamless pipes have an outer diameter greater than 32mm and a wall thickness of 2.5-200 mm; The outer diameter of cold-rolled seamless pipe can reach 6mm, the wall thickness can reach 0.25mm, the outer diameter of thin-walled pipe can reach 5mm, and the wall thickness is less than 0.25mm, so the dimensional accuracy of cold-rolled seamless pipe is higher than that of hot-rolled. Seamless steel pipes are generally made of high-quality carbon steels such as 10, 20, 30, 35 and 45, low-alloy structural steels such as 16Mn and 5MnV, or combined steels such as 40Cr, 30CrMnSi, 45Mn2 and 40MnB. Seamless pipes made of low carbon steel, such as 10 and 20, are mainly used for fluid transportation pipelines. Seamless tubes made of medium carbon steels such as 45 and 40Cr are used to manufacture mechanical parts, such as those of automobiles and tractors. Generally, seamless steel pipes should be used to ensure strength and flattening test. The hot-rolled steel pipe is delivered in hot-rolled state or heat-treated state; Cold rolling is delivered in heat treatment state.
The above is the introduction of the production technology of hot rolled steel pipe. Do you know what the production process of hot rolled steel pipes is now? Hot rolled steel pipe is a kind of anti-oxidation steel pipe. This kind of steel pipe has high toughness and is not easy to deform. Hot rolled steel pipe is a very common steel pipe material, which is mainly used to make underground water pipes and parts of some large mechanical equipment. Hot rolled steel pipes are also used in most construction projects. Hot-rolled steel pipes come in different sizes, so pay attention when buying them.
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