How to control the quality of the spiral steel pipe? The perforation temperature of the billet varies depending on the raw materials. The temperature of most thermal inflation welded pipes is about 1200 ° C. When the carbon content and other alloy elements are high, the temperature is slightly lower.
The second key to heating is to minimize the number of oxide films as much as possible. Especially in thermal pinch tubes, thermal expansion welding tube is based on the quality of life from the east to west, and its requirements are getting worse.
During the production process of the spiral steel pipe, because the first processing was performed in the heat, heating operation was a very important process to determine the quality of the product.
The hot air furnace is heated from room temperature to the processing temperature according to its role, and is used to heat the billet to the necessary processing temperature during the processing process. Improper heating will cause cracks, folding and pain on the surface of the inside and outside of the billet.
There are many ways to keep the hot air furnace, but the first use is a ring heating furnace. This heating furnace has the bottom of the ring furnace, which can be replaced slowly. The billet is loaded from the bottom diameter along the bottom of the entrance. When the exit is used, the stove can be heated evenly to the specified temperature. The key to this heating operation is to heat the billet evenly to the temperature suitable for processing. Because perforation has a great impact on the quality of the ejection holes, that is, the temperature of the bending pipe is an important condition that affects the quality of the ejection hole. Therefore, it is generally necessary to control the rough temperature in the process of the shooting hole.
