SSAW Pipe

　　 1. Definition of lsaw steel pipe pressure pipeline 　　 LSAW steel pipe pressure piping should include all straight seam steel pipe pipes that use pressure to deliver gas or liquid. From the point of view of safety production, it is the name of the straight seam steel pipe pressure vessel. Therefore, it is not a pressure pipe in a simple sense. The possibility of accidents and the hazard of the accident define the scope of the straight seam steel pipe pressure pipe. The pressure line uses a certain pressure, a tubular device for conveying gas or liquid, a liquid medium having a temperature higher than or equal to the standard boiling point, and a pipe having a nominal diameter of more than 25 mm. Straight seam steel pipe pressure equipment, in addition to its own blasting, will also cause explosions and fires due to leakage of the medium. 　　 2. Application of lsaw steel pipe pressure pipeline 　　LSAW steel pipe pressure piping is an important part of the production process, main...

　　Fracture of lsaw steel pipe , mechanical properties of hydraulic (pneumatic) parts used in design, brittle fracture is also related to the use temperature of the component. 　　It has been found through research that when the temperature is lower than a certain temperature value, it is found that the data will be transformed into a brittle state, and the impact absorption work is obviously reduced. This phenomenon is called cold brittleness, and low stress brittle fracture occurs in high-strength metal materials. In the process, the data organization is far from uniform and isotropic, there will be cracks, and there will be defects such as inclusions and pores. These defects can be regarded as microcracks in the material. Therefore, the design should also select the data with the appropriate cold-brittle transition temperature according to the working temperature of the component. 　　In general, it is assumed that the data is uniform and continuous isotropic. According to this metho...

　　Metal and atmospheric oxygen of 321 stainless steel seamless pipe in response to the appearance will constitute an oxide film. However, in the general carbon steel pipe on the composition of the continuous oxidation of iron oxide, so that corrosion continues to expand, resulting in holes. So that good stainless steel seamless pipe is damaged, we can use paint or oxidation of metal such as zinc, nickel and chromium plating to cover the appearance of carbon steel, but, as we expected, this maintenance only is a layer of maintenance film, assuming that the maintenance layer is damaged, steel will start to be corroded. The corrosion resistance of stainless steel depends on the chromium, chromium is a part of the composition of steel, chromium on the steel treatment, the appearance of the oxide type will be changed to similar to pure chromium metal on the surface oxide. This tightly adhered chromium-rich oxide maintains the appearance and avoids further oxidation. 　　The heat treatment ...

　　In order to improve the performance effect of square tube , we can hot-dip galvanized square tube, hot-dip galvanizing is a heat treatment process effect, in the process of galvanized square tube, in order to meet the demand effect, we need to constantly testing, if not measured for the square tube quality has a lot of impact. 　　First, It need to be from the ability to carry out the test, in fact, galvanized thickness of the hot galvanized square tube. Because the galvanized square galvanized layer determines whether it can meet the requirements of corrosion protection, in the testing process can be used to detect the use of professional measurement tools, in the detection process of hot galvanized square tube galvanized layer thickness is a certain requirement, in use is the need to be based on these provisions to identify. Followed by homogeneity to be detected, in fact, the thickness of the surface of the galvanized layer. In the detection process to improve the quality of the u...

　　 Galvanized square tube welding method and the general low-carbon steel is the same: welding the first layer of welding in the weld, try to make the zinc layer and vaporization, evaporation and escape the weld, can greatly reduce the liquid zinc Stay in the weld. In the welding of the weld, the same layer in the first layer as much as possible so that the zinc layer melting and vaporization, evaporation and escape the weld, the method is the first part of the electrode forward out about 5 ~ 7mm or so, when the zinc layer melt and then return to the original position to continue to apply welding. And then welding and vertical welding, such as the use of short slag electrode such as J427, undercut tendency will be very small; if the use of front and rear transport technology, but also can be defect-free welding quality. 　　Welding process control of the pipe before the preparation of welding with the general low-carbon steel is the same, need to pay attention to is to carefully handl...

　　The pickling process acid pickling solution is generally a mixture of various acids, mainly sulfuric acid, nitric acid and hydrofluoric acid, etc. These mixed acids are highly corrosive and have a strong oxidizing property and a high temperature of corrosive medium. This puts high demands on the corrosion resistance of anticorrosive materials. Stainless steel seamless steel pipe pickling production line process from production to waste gas recovery system, there is a strong corrosion state in all aspects, so the choice of anti-corrosion materials is directly related to the environmental recovery system of equipment, workshop floor, trench, waste water and waste gas Normal use of etc. 　　 Seamless steel pipe pickling process 　　The pickling of seamless steel tubes uses solvents and emulsions to clean the surface of welded steel pipes for low-pressure fluid transport to remove oil, grease, dust, lubricants and similar organic matter, but it does not remove rust, scale, etc. from the ...

　　As with other materials exposed to the atmosphere, seamless stainless steel pipe is also dirty. Future lectures will analyze the design factors that affect maintenance and cleanup costs. However, there is a relationship between rain erosion, manual flushing and dirty surfaces. 　　The effect of rainwater scuffing was determined by placing the same slats in the atmosphere directly and on the shelter. The effect of manual flushing is determined by manually scrubbing the right side of each slab every six months with a sponge stained with soapy water. It was found that dust and siltation on the surface by rainwater scrubbing and manual scrubbing had a good effect on the surface condition compared to the slats placed in the shed and not washed. But also found that the surface processing of the situation also has an impact on the surface of the slab than the surface of the rough effect is better. 　　So the interval between the scrubbing by a variety of factors, the main factor is the req...