A brief analysis of temperature and lubrication issues in the production process of straight seam steel pipes

In the process of producing straight seam steel pipes, the temperature must be strictly controlled to ensure the reliability of welding. If the temperature is too low, the welding position may not reach the temperature required for welding. When most of the metal structures are still solid, it is difficult for the metals at both ends to penetrate each other and combine. When the temperature is too high, there are many metals in the molten state at the welding position. The texture of these parts is very soft, and some fluidity may carry molten droplets. When such metal drops, there is also not enough metal to penetrate each other. When welding, there will be some unevenness with the weld to form a molten hole. Therefore, the manufacturer of integrated sewage treatment equipment reminds us that the temperature must be strictly controlled during the production process of straight seam welded pipes. Regular manufacturers have very good control technology, so the temperature control requirements can be achieved during the production process to ensure the product, so we need to buy straight seam welded pipes from regular manufacturers.

Hot expansion straight seam steel pipes are mostly around 1200℃, and the temperature should be 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 the hot extrusion elbow, 16Mn straight seam steel pipe starts from the service life of the tool and the surface of the extruded pipe, and the requirements are more stringent. 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 to determine the product. Straight seam steel pipes are like furnaces used for heat. According to their functions, residual stress is caused by uneven cooling. Residual stress is the internal self-balanced stress without external force. Hot-rolled steel sections of various cross sections have this kind of residual stress. Generally, the larger the cross-sectional size of the steel section, the greater the residual stress. Although the residual stress is self-balanced, it still affects the performance of steel components under external forces.

If the welding temperature of the straight seam steel pipe is not well controlled, 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 room temperature to processing temperature; the latter is used to reheat the blank to the required processing temperature during processing. Improper heating of straight seam steel pipes will cause cracks, folds, and eccentricity on the inner or outer surface of the pipe blank.

There are many ways to heat straight seam steel pipes, but the one to be used is a suspended heating furnace. This heating furnace has a ring-shaped furnace bottom, which can be slowly rotated. The blank is loaded along the diameter of the furnace bottom from the entrance, and it is heated and evenly heated to the specified temperature when it is reversed and used at the exit. The key to this heating operation is to evenly heat the blank to a temperature suitable for processing. Since perforation has a great influence on the temperature, that is, the temperature during perforation processing is an important condition for the influence, the temperature of the blank during perforation processing is generally controlled.

Straight seam steel pipes need to use a product in the production process, that is, glass lubricant. Before using glass lubricant, graphite was used in production. Because this product was not available in the market at that time, graphite could only be used as a lubricant. However, after long-term use, everyone will encounter some problems, that is, the heat transfer efficiency of graphite is very high, and the heat insulation effect is also very poor, which will cause the mold to heat up very quickly during work, which will easily cause wear of straight seam steel pipes 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 lubricant, but why use them? This is because trolley furnaces have many advantages. First, the heat transfer efficiency is relatively low, which can play a role in heat preservation and extend the use time of the equipment.