SSAW Pipe

　　Based on experience, we describe several common rust conditions of stainless steel pipes as follows: 　　First, stainless steel has peeling trachoma and other rust. Substandard materials will cause rust. 　　Second, the annealed stainless steel strip becomes black, and the ammonia leak from the perforation of the furnace tube will cause rust. 　　Third, the welding seam of the stainless steel control pipe factory is rough, and the black line will cause rust. 　　Fourth, do not pay attention to the protection of stainless steel pipes during transportation, mix stainless steel pipes with chemical products that can pollute and corrode, or rainy transportation to allow two waters to penetrate into the packaging film will cause rust. 　　Fifth, when the processing manufacturer cuts stainless steel or iron when installing and manufacturing the product, splashing iron filings on the surface of the stainless steel pipe may cause rust. 　　Sixth, the use of users in highly polluted areas (su...

　　There are many kinds of pipes and their production methods are various. The common production methods are as follows： 　　(1) Production of pipes by thermal pressure processing. There are many ways to produce hot rolled seamless pipes. The tubes used for hot rolled tubes are hollow billets, solid billets or steel ingots. In hot rolling production, the punching is to pass the heated pipe blank into a thick-walled capillary tube on a perforating machine, and roll the thick-walled capillary tube into a finished tube on the pipe rolling machine to the required wall thickness and accuracy, and then pass the sizing, reduction or expansion Diameter, and finally cooling and finishing.The hot-pressing method is mainly used for rolling pipes, but for non-ferrous metals, rare metals that are difficult to deform, and precious metal machines, special-shaped profile pipes are produced by extrusion. 　　(2) Pipes are produced by cold pressure processing. The cold-pressure processing method mainly r...

　　Seamless steel tube is a long strip of steel with a hollow cross section and no seams on the periphery. There are more than 5,100 production plants under 1,850 companies in more than 110 countries producing seamless pipes in the world, and more than 260 plants under 170 companies in 44 countries producing petroleum pipes. 　　Because of this feature of seamless steel pipes, it is widely used in the transportation of petroleum, natural gas, gas, water and certain solid materials. Compared with other steel pipes, seamless steel pipes have a stronger advantage in terms of resistance to bending. And the quality of seamless steel pipes is also relatively light. It is a very economical section steel. 　　In addition, seamless steel tubes also have the following advantages: 　　1. The seamless steel pipe is light in weight and its weight is only 1/5 of the square steel. 　　2. Corrosion resistance of seamless steel pipe Corrosion resistance to acid, alkali, salt and atmospheric environment,...

　　In the appearance of the steel pipe, the heat expanded is red, and the inner diameter is lead powder.A method of processing thermal expansion steel pipe is to process small-diameter steel pipe into large-diameter steel pipe. The mechanical properties of hot-expanded steel pipes are slightly worse than those of hot-rolled steel pipes. 　　The heat-expanded steel pipe we often say refers to the steel pipe with relatively low density but strong shrinkage. ( Seamless steel pipe ) can be referred to as heat-expanded pipe for short. A rough tube finishing rolling process in which the diameter of a pipe is enlarged by a diagonal rolling method or a drawing method. Thickening steel pipes in a short period of time can produce non-standard, special types of seamless pipes, and the cost is low and the production efficiency is high, which is the current development trend in the international pipe rolling field 　　When welding seamless steel pipes with magnetic, we often see unstable arc combust...

　　27MnCrV is a new type of steel used in the production of TP110T steel grade casing pipe sleeves. The steel types used in conventional production of TP110T steel grade oil pipe sleeves are 29CrMo44 and 26CrMo4. Compared with the latter two, 27MnCrV contains less Mo, which can greatly reduce production costs. However, after the 27MnCrV is produced by the normal austenitizing quenching process, there is obvious high temperature tempering brittleness, which results in low impact toughness and instability. 　　To solve such problems, two methods are usually used to deal with them. First, rapid cooling after tempering is used to avoid high temperature brittleness and obtain toughness. The second is the sub-temperature hardening method through the incomplete austenitization of steel to effectively improve harmful elements and impurities, and improve toughness. The first method has relatively strict requirements on heat treatment equipment and requires additional costs. 　　27MnCrV steel ha...

　　ERW is the abbreviation of electric resistance welding. 　　The welding method of ERW pipe and submerged arc welded pipe is significantly different. The pressure welding method without filler metal is adopted. The weld is not filled with other components, and the skin effect and the proximity effect of the high frequency current are used to instantaneously heat the edge of the plate. At the soldering temperature, the weld of the forged structure is extruded by a squeeze roll. High-quality steel pipes require heat treatment on the weld line or off-line to refine the microstructure of the weld zone. The weld of the high-quality ERW welded pipe can reach the same level of toughness as the base metal, which cannot be achieved by the submerged arc welding process. 　　EFW is the abbreviation of electric fusion welding. 　　One of submerged arc welding (SAW)-electric welding (EFW) is a process in which metal is heated by one or several consumable electrodes and a workpiece to heat the met...