Wuxi Special Square Tube Manufacturer Wholesale Manufacturer
The square tube detour is caused by improper adjustment of the rolling mill, residual stress during rolling and improper cooling along the tube section and length. Therefore, it is impossible to get very straight pipes directly from the rolling mill. Only after cold straightening the roundness of pipes can you satisfy the rules of technical conditions. The basic principle of straightening is to stop the elastic-plastic detour of the square tube from a large one to a small one, so it is necessary for the steel tube to be repeatedly detoured in the straightening machine. The level of the steel pipe's repeated detour is mainly determined by the adjustment of the straightening machine. There are many factors that affect the straightening quality, such as the roundness of the original pipe, steel pipe size and data straightening model, adjustment parameters, etc.
Wuxi Special Square Tube Manufacturer Wholesale Manufacturer
Fine tube is a type of steel tube with a higher degree of fineness than steel tube, and its use is also very common. In particular, various properties and uses of fine tube are relatively important manifestations of fine tube. If fine tube is not used, it is necessary to understand the nature and use of fine tube in all aspects, so as to achieve reasonable use of fine tube. Fine tube is a special condition of steel pipe and also a good steel. It can be said that the material of fine tube is also quite special, and its application volume and market prospect are relatively large. Fine tube is a kind of high-precision steel tube material after cold drawing or hot rolling. Fine steel pipes are mainly used to consume products of pneumatic or hydraulic components, such as air cylinders or oil cylinders, which can be seamless pipes or welded pipes, because they have no oxide layer on the inner and outer walls, can accept high pressure without leakage, high precision, high brightness, cold bending without deformation, flaring, flattening without cracks, etc. The chemical composition of fine steel pipe includes carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P and chromium Cr.
Wuxi Special Square Tube Manufacturer Wholesale Manufacturer
The manufacturing technology of fine steel pipes is very strict. Only a few steel pipe factories can meet the conditions for consumption of fine steel pipes, which leads to the appearance of fine steel pipes in the market, some of which are not really fine steel pipes. Therefore, when we purchase steel pipes, we should know some skills to distinguish fine steel pipes. But for ordinary steel pipes, it is indicated that they are not lubricated enough, and their toughness and torsional strength are not good enough. Once this steel pipe stops flaring or flattening, it is easy to show cracks. When these cracked steel pipes are used in machinery and equipment, they will present falling and broken residues. These residues will enter more and more delicate parts with the use of the equipment, which will affect the speed and progress of the equipment for a long time, presenting various equipment problems. If fine steel pipes are used, this phenomenon will be reduced in greater layers. Fine seamless steel pipe is a kind of high-precision steel pipe material after cold drawing or hot rolling. This allows the pipeline to be free from leakage under high pressure. Even after flaring, flattening and other operations, the pipeline will not show cracks. This ensures the normal operation of the equipment, speeds up the consumption efficiency and improves the overall interests. With the change of time, the supply and demand relationship of the market is also changing from time to time. This is why there are always some new products in the market. Because every industry hopes to have higher quality and higher performance products. In the steel pipe market, the speed of change will be even higher. Especially in recent years, the renewal rate of steel pipes has reached a peak. Under such a background, there are many steel pipes whose quality cannot keep up with this change, which have slowly disappeared. However, there are also some steel pipes that, depending on their quality and application performance, have opened up a larger market space, and fine steel pipes are one of them.
Wuxi Special Square Tube Manufacturer Wholesale Manufacturer
(1) Alloy composition For seamless square tubes, elements 0, 10 and F are the main alloy elements that make the alloy have good pitting corrosion resistance. Other elements may also have corresponding effects. K and other elements will reduce the pitting corrosion resistance of seamless square tubes. It is certain that the effect of alloying elements on the pitting corrosion resistance of data can be summarized briefly into favorable effects. 13. The impact of 0 is variable. 3 is beneficial in solid solution, but it is harmful when it is precipitated as intermediate metal phase, 0 is good in solid solution, and it is harmful when it is precipitated as carbide, but it has slightly adverse effects. (2) The study on cold working of austenitic seamless square tubes shows that the number of etch pits on the surface of the specimen increases and the size of the etch pits decreases after cold working. This is due to the increase of dislocation density during cold processing. Dislocation exposed on the surface is easy to cause corrosion pits. Cold processing tends to increase pitting corrosion. (3) For a given alloy environment system, the element that determines the corrosion potential of alloy spots is the brightness of the data surface. In fact, it is meaningless to compare the corrosion tendency of stop points of alloys with different surface brightness. The influence of surface brightness on the pitting corrosion performance of seamless square tubes is shown in the figure. It indicates that in the same data environment system, if the surface brightness is different, the difference of pitting corrosion potential can be more than 14. (4) The oxide formed by heating of the seamless square tube in the air may have a serious impact on the pitting corrosion performance. The microstructure of hot-dip galvanized square tubes plays an important role in the pitting corrosion resistance of alloys. Various phases, such as sulfide inclusion and 3-ferrite. Phase, sensitized grain boundary and weld may have a decisive impact on the pitting corrosion resistance of steel, and they are all sensitive parts to pitting corrosion. For cast seamless square tubes with complex microstructure and martensite seamless square tubes with microstructure sensitive to heat treatment process, the relationship between pitting corrosion and constituent phases is closer. It is pointed out that the complex manganese sulfide inclusions are more sensitive to pitting corrosion. Therefore, the use of aluminum deoxidizer should be prevented when smelting seamless square tubes. (5) The oxide film produced by welding may be detrimental to the pitting corrosion resistance of the alloy in strong chloride solution. (6) The main function of passivation treatment is to dissolve the inclusions and infections on the surface of the seamless square tube to make it clean. It can also remove the manganese sulfide inclusions on the surface, which may become the source of pitting corrosion, thus improving the pitting corrosion resistance of the seamless square tube. It should be noted that the seamless square tube should be cleaned with sodium hydroxide solution after passivation treatment.
Wuxi Special Square Tube Manufacturer Wholesale Manufacturer
Wall thickness grading of rectangular pipes - extra thick rectangular pipes, thick rectangular pipes, thin rectangular pipes. The thick wall rectangular pipe is a galvanized welded square pipe used for low pressure fluid escort, which is only used for ordinary low pressure fluid, mainly used for water, gas, oil, hot water or steam escort; Galvanized welded thick wall rectangular pipe for low pressure escort is mainly used to escort ordinary low pressure fluids such as water, gas, oil, hot water or steam. The surface of the square pipe adopts hot galvanizing or cold galvanizing anti-corrosion process. The rectangular thick wall mining infusion welding square tube is mainly used for mining air pressure welding, row welding, shaft drop welding, etc.
