The length of straight steel pipes is usually 300mm-1200mm. Both sides can be fixed or more ruler can be fixed or more ruler. The perforation temperature of straight seam steel pipes is different according to the raw material.
The heat expansion straight seam steel pipe is mostly around 1200 ° C. The temperature is slightly lower when the amount of carbon containing and other alloy elements is slightly lower. The key to the heating operation of straight steel pipes is to reduce the number of oxide. Especially when kneading the elbow, the 16mn straight steel pipe moved from the east -west life and the surface of the tube.
During the production of the 16MN straight seam steel pipe, the first processing is performed in the heat state, so heating operation is a very important process for resolution products.
Straight steel pipes, such as heat, are divided into two types: heating furnace and re -heating furnace according to their effects. The necessary processing temperature.
Inappropriate heating of straight seam steel pipes will become the reason why cracks, folding, and pain such as cracks, folding, and pain on the outer surface of the tube.
There are many ways to heal the heating furnace of straight sewing steel pipes, but the primary use is the probation heating furnace. This heating furnace has a ring -shaped furnace, which can be slowly transformed. The ingredients are loaded in the diameter of the bottom of the furnace from the entrance. When the reversal is used, it can be heated and the average temperature is heated to the regular temperature of the regular temperature. A stove. The key to this heating operation is to evenly heat the blank to the temperature suitable for processing.
Because perforation has a great impact, that is to say, the temperature during perforation is an important condition that affects, so generally control the temperature of the ingredients during perforation processing.
Disadvantages of straight seam steel pipes:
1. Remnant stress caused by uneven cooling. Residual stress is the stress that the internal self -balance is balanced without external forces. The hot -rolled steel of various sections has such residual stress. Large. Although the residual stress is balanced by each other, the performance of the steel component still has an impact on the performance of the steel. For example, it may have an unfavorable effect on deformation, stability, and anti -fatigue;
2. After welding, the non -metal miscellaneous objects inside the straight steel pipes are pressed into thin slices, and the layered phenomenon occurs. The performance of 20#straight seam steel pipes has deteriorated in the thickness direction. Turly tearing. Local strain induced by welding seams often reaches several times that of the yield point strain, which is much larger than the strain caused by loads.
