During the production of straight seam steel pipes, the temperature must be strictly controlled to ensure the reliability of the welding. If the temperature is too low, the welding position may not reach the temperature required for welding. When most of the metal structure is still solid, it is difficult for the metals at both ends to penetrate each other and join together. At that time, when the temperature was too high, there was a lot of metal in the molten state at the welding position. The texture of these parts was very soft and fluid, and there might be molten droplets. When such metal dripped, the same would happen. There is not enough metal to penetrate each other. And during welding, there will be some unevenness and welding seams to form molten holes. Therefore, integrated sewage treatment equipment manufacturers remind us that temperature must be strictly controlled during the production process of straight seam welded pipes. Regular manufacturers have advanced control technology, so they can achieve temperature control requirements during the production process and ensure product quality, so we need to purchase straight seam welded pipes from regular manufacturers.


Thermal expansion straight seam steel pipes are mostly around 1200°C. The temperature is slightly lower when the carbon content and other alloying elements are high. The key to the heating operation of straight seam steel pipes is to reduce the amount of oxide scale as much as possible. Especially in hot kneading elbows, the requirements for 16Mn straight seam steel pipes are more stringent starting from the tool life and the appearance of the kneaded pipe. Straight seam steel pipe In the production process of 16Mn straight seam steel pipe, since the processing is carried out in a hot state, the heating operation is a very important process in determining the finished product. Straight seam steel pipes are used as thermal furnaces, depending on their effect, resulting in residual stress caused by uneven cooling. Residual stress is the internal self-balanced stress in the absence of external force. Hot-rolled steel sections of various sections have such residual stress. Generally, the larger the cross-section size of the section steel, the greater the residual stress. Although residual stress is self-balanced, it still affects the performance of steel components under the action of external forces.


If the welding temperature of straight seam steel pipe is not controlled well, it may have adverse effects on deformation, stability, fatigue resistance, etc. It is divided into two types: heating furnace and reheating furnace; the former is used to heat the blank from normal temperature to processing temperature; The latter is used to reheat the blank to the necessary processing temperature during processing. Improper heating of straight seam steel pipes will be the cause of defects such as cracks, folds, and eccentricities on the inner or outer surface of the tube blank.


There are many types of straight seam steel pipe heating furnaces, but the suspended heating furnace should be used. This kind of heating furnace has an annular furnace bottom, which can rotate slowly. The billet is loaded from the entrance along the diameter direction of the furnace bottom. Once the billet is turned to the exit, it can be heated and evenly heated to a prescribed temperature. A kind of stove. The key to this heating operation is to heat the blank evenly to a temperature suitable for processing. Since perforation has a great influence on the perforation process, that is to say, the temperature during perforation processing is an important condition, so the temperature of the blank during perforation processing generally needs to be controlled.


In the production process, straight seam steel pipes need to use a product, that is, glass lubricant. Before the use of glass lubricants, they were produced with graphite, because this product was not available in the market at that time. Therefore, graphite can only be used as a lubricant, but after long-term use, everyone will find some problems, that is, the heat transfer efficiency of graphite is very high, and the heat insulation effect is also very poor, so when working It will cause the mold to heat up very quickly, which will easily cause the straight seam steel pipe to wear, so that the product cannot be used for a long time. Therefore, manufacturers have been looking for a product that can replace graphite, that is, glass lubricants, but why should they be used? That is because the trolley furnace has many advantages. The first is that the heat transfer efficiency is relatively low. It plays the role of heat preservation and can also extend the use time of the equipment.