Spiral steel pipe heating process

In spiral steel pipe production process, the main processing was conducted under the thermal state, so the heating operation is very important to determine product quality process.

Heating operation lies in: the temperature of billet uniformly heated to suitable for processing due to punch a great influence on the quality, that is to say, the temperature of the perforation process is one of the important conditions affect the quality, so often to the perforation process of billet temperature control.Improper heating will be inside the tube billet surface or outer surface crack, folding and eccentric waste products.Blank hole temperature varies according to different materials.But mostly at about 1200 ℃, carbon and other alloying elements is large temperature is somewhat low.Heating operation the second key is to minimize the number of scale: especially in hot extrusion elbow, from the tool life and surface quality of extruded tube, more strict.Such as hot stove, according to their functions, divided into two kinds of furnace and furnace again;The former is used to heat the blank from room temperature to the processing temperature;The latter will be used in the processing process, then heated to the necessary processing temperature.There are many kinds of heating furnace, but the main use of annular furnace.This kind of furnace has annular furnace bottom, it can turn slowly, the diameter of the blank from the entrance along the bottom direction loading, turning a can be used at the exit of the heating and soaking to the specified temperature of a stove.Spiral steel pipe production process more slowly, but the factory use the spiral steel pipes are all conform to the specifications of the products.