Seamless Steel Pipe

 　　How much smoothness of the inner hole of the cold drawn seamless steel pipe can be achieved? This is mainly based on the customer's product requirements. In the field of hydraulic steel pipes, the inner hole smoothness of the cold drawn seamless pipe can reach Rz2.0mm/M. What aspects of the finish of the inner hole of the cold drawn seamless pipe are affected? 　　The main influencing factors of the inner hole finish of cold drawn seamless steel pipe: 　 　1. Piercing 　　The perforation experience of the manufacturer is immature, the perforation temperature is uncontrollable, the perforation equipment is short, and the uneven heating of the round steel causes a large temperature deviation between the inside and outside of the steel pipe, forming pits, pits, and peeling, etc., and the finish is not good. Xinyue has an elongated perforation furnace, and the steel pipe is heated evenly. 　　2. Cold drawn mold 　　There are defects in the cold drawing mold itself, resulting in poor internal ...

 　　Generally, the deformation of welded parts does not need to be corrected. Only when the post-weld deformation exceeds the technical requirements, it needs to be corrected. The welding deformation is mainly caused by the shrinkage of the welded joint. The correction is actually to create a new deformation to offset the original deformation. The main methods are as follows: Mechanical method and heating method. 　　1. Mechanical correction method 　　Hand hammer forging: Use an iron hammer to strike the deformed welding workpiece. This is a relatively simple correction method. Generally, a horn is required to prevent damage to the workpiece. Rolling equipment is used to roll the weld seam and its surroundings of the thin weldment. To achieve the purpose of correction. For simple small and medium-sized welded parts, jacks (hydraulic pressure and screws) can be used for correction, for rigid and strong weldments, presses can be used for correction, and profiles can be corrected with spe...

　　Precision stainless steel pipes are very characteristic in terms of model specifications and appearance performance. First of all, the thicker the wall of this type of stainless steel pipe, the higher the cost performance and practicability. The thinner the pipe wall, the higher the processing cost. In addition, the performance limitations of stainless steel pipes depend on the processing technology. Generally, the precision of seamless steel pipes is low, and the thickness of the pipe wall is uneven, the brightness of the inner and outer surfaces of the pipe is low, and the cost of sizing is relatively expensive. Pockmarks and black spots are easy to appear and are not easy to remove. In addition, the detection and reshaping of precision stainless steel pipes and thick-walled pipes must be processed offline. Therefore, stainless steel pipes show sufficient superiority in the field of high-pressure, high-strength mechanical structural materials. 　　There are about 45 types of hot-roll...

 　　The advantages of cold drawn steel tube 　　(1) the size is accuracy, tolerance is small. 　　(2) when the die hole machining is excellent, well-oiled and the surface of good quality and finish of up to seven. 　　(3) using it to produce small-diameter steel pipe and a special section. 　　(4) cold contribute to grain refinement of metals, together with the appropriate heat treatment to obtain good mechanical properties of steel pipe. 　　(5) The equipment is simple, flexible production methods, and to facilitate the replacement of species. 　　In addition, forming speed high yield without damage coating made various section forms meet the use conditions; cold rolled Steel great plastic deformation improve steel yield points. 　　 http://www.xysteelpipe.com/info/Advantages-of-cold-drawn-steel-tube-1973-1.htm

 　　Straight seam steel pipe refers to a steel pipe whose weld seam is parallel to the length of the steel pipe. Its production process is relatively simple. The strength of spiral steel pipe is generally higher than that of straight seam steel pipe. It can produce welded pipes with larger diameters from a narrower blank, and can also produce welded pipes with different diameters from a blank of the same width, but compared with a straight seam welded pipe of the same length, the weld length is increased by 30%-100%. The production speed has slowed down. According to its production process, it can be divided into high frequency straight seam steel pipe (erw steel pipe) and submerged arc welded straight seam steel pipe (lsaw steel pipe). The submerged arc welded straight seam steel pipes are divided into UOE, RBE and JCOE steel pipes according to their different forming methods. For most forming methods, the last process is to expand the full-length diameter of the welded pipe blank ...

 　　(1) When the cooling is over, that is, when the temperature of the surface layer and the core part are all the same, the elastic deformation of the surface layer and the core part also disappear and return to the original state. Although instantaneous thermal stress is generated during the cooling process, the residual thermal stress after the cooling is terminated is equal to zero. 　　(2) Of course, this is a rather special situation. Due to the large thermal stress generated in the early stage of the quenching process, the steel is still at a higher temperature and has good plasticity. The thermal stress will exceed the yield strength of the large-diameter steel pipe, resulting in surface tension and core compression. The plastic deformation and the thermal stress are alleviated. 　　(3) When cooling continues, the cooling rate of the surface layer slows down, while the cooling rate of the core part increases faster, and the temperature difference between the surface layer and th...

 　　Anti-corrosion technology of seamless anti-corrosion steel pipe: 　　The production process of seamless anticorrosive steel pipes is relatively mature, and all kinds of anticorrosion can be produced. Among them, seamless anticorrosive steel pipes have outstanding performance advantages. The equipment usually used in the production of seamless anticorrosive steel pipes includes steel pipe buffering platform, pipe shifting unit, tractor, pipe-piercing machinery, high-pressure gun generator, repair platform, transmission line, steel pipe preheating furnace, shot blasting host and other equipment. The seamless anticorrosive steel pipe shall be applied to the inspection bench and the return transmission line of the unqualified steel pipe in the test. The application of these not only can obtain good insulation steel pipes, but also the product quality has passed strict inspections. 　　The specific production process of seamless anti-corrosion steel pipes(astm a106 ) is to first inspect ...

 　　a) The following phenomena occur when the boiler tube is damaged 　　1. The water level of the boiler drops rapidly, the steam pressure and the feed water pressure decrease, and there is a noticeable noise when the boiler tube bursts. 　　2. There is a sound of steam ejecting in the combustion chamber and flue. 　　3. The negative pressure in the combustion chamber changes to a positive pressure, and furnace smoke is sprayed out of the furnace door. 　　4. The feed water flow rate is abnormally greater than the steam flow rate. 　　5. The exhaust gas temperature suddenly drops. 　　6. Unstable combustion of the boiler or cause fire extinguishing. 　　b) Reasons when the boiler tube is damaged 　　1. The boiler inlet water is not deaerated, causing serious corrosion in the boiler tube. 　　2. The circulating water in the boiler tube vaporizes, causing a steam pocket in the tube, causing the tube wall to overheat, causing convex hulls and cracks. 　　3. The quality of boiler feed water does not meet ...