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Sharing China-Made with Global Customers
How to control the quality of spiral steel pipe? The piercing temperature of steel billet varies depending on the raw material. The temperature of most hot expanded welded pipes is about 1200℃, and slightly lower when the carbon content and other alloying elements are higher.
The second key to heating is to minimize the amount of oxide film, especially in the hot pinch bends, thermal expansion welded pipe is from the east to the west of the life and pinch the surface quality of the pipe from the beginning of the requirements of the increasingly serious.
In the production process of spiral steel pipe, because the first processing is carried out in a hot state, the heating operation is to determine the quality of the product is a very important process.
The hot air furnace heats the billet from room temperature to the processing temperature according to its function, and is used to heat the billet to the necessary processing temperature during the processing. Improper heating will result in cracking, folding and pain on the inner and outer surfaces of the billet.
There are many different types of hot air furnaces, but the first to be used is the annular heating furnace. This type of heating furnace has a ring shaped bottom that can be changed slowly, the billet is loaded from the inlet in the direction of the diameter of the bottom, and the outlet is used to heat the furnace evenly to the required temperature.
The key to this heating operation is to heat the billet uniformly to a temperature suitable for processing. As the perforation has a great impact on the quality of the shot hole, that is to say, the bending temperature is an important condition affecting the quality of the shot hole, so it is generally necessary to control the billet temperature in the shot hole process.
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