The heat-expanded seamless steel pipe
is a heat expansion pipe that we often say, and the steel pipe with a relatively low density but a strong shrinkage can be simply referred to as a heat expansion pipe. A roughing finishing process for expanding the diameter of a pipe by a cross-rolling method or a drawing method. In a relatively short period of time, the outer diameter of the steel pipe is increased, and a non-standard, special type of seamless pipe can be produced, and the cost is low, and the production efficiency is high, which is a development trend in the international rolling pipe field.
The raw material for rolling the seamless pipe is a round tube blank, and the round tube blank is cut into a blank having a length of about 1 m by a cutting machine, and sent to a furnace for heating via a conveyor belt. The billet is fed into a furnace and heated to a temperature of approximately 1200 degrees Celsius. The fuel is hydrogen or acetylene. Furnace temperature control is a key issue.
After the round billet is released, it is subjected to a through-hole punching machine. The more common perforating machine is a conical roller punching machine. This perforating machine has high production efficiency, good product quality, large diameter of perforation and can wear a variety of steel types. After perforation, the round billet is successively rolled, rolled or extruded by three rolls. After extrusion, the tube should be sizing. The sizing machine is rotated at a high speed by a conical drill bit into a steel core to form a steel pipe.The inner diameter of the steel pipe is determined by the outer diameter of the sizing machine drill bit.
After the steel pipe has been sized, it enters the cooling tower and is cooled by water spray. After the steel pipe is cooled, it is straightened. After the steel pipe is straightened, it is sent to a metal flaw detector (or water pressure test) by a conveyor belt for internal flaw detection. If there are cracks inside the steel pipe, bubbles and other problems will be detected. After the quality inspection of the steel pipe, it must be carefully selected by hand. After the quality inspection of the steel pipe, the paint is sprayed with the number, specification, production batch number, etc. It is hoisted into the warehouse by a crane.