After squeezing, take off the tube for sizing. If there are cracks or bubbles inside the steel pipe, it will be detected.Generally, the more common piercing machine is a tapered roller piercing steel pipe piercing machine.1. The sizing machine uses a tapered drill bit to rotate at a high speed into the steel blank to punch holes 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 round tube blank is emptied, it needs to be headed and annealed.The raw material for rolling seamless pipes is round pipe blanks. After the steel pipe is cooled, it will be straightened. The round pipe blanks are cut by a cutting machine into a billet with a length of about 1 meter and sent to the furnace for heating via a conveyor belt.

 Rusty thin-walled steel pipe, special-shaped steel pipe. Cold rolled and delivered in heat-treated condition. ASTM A53 ERW pipe is a typical carbon steel pipe. After the steel pipe is straightened, it is sent by the conveyor belt to the metal flaw detector for internal flaw detection. Then it is followed by multiple cold drawing.From the outside, the length of cold drawn seamless pipe is generally shorter than that of hot rolled seamless pipe. Hot-rolled steel pipes are delivered in hot-rolled state or heat-treated state. The heating tube billet fuel is hydrogen or acetylene. Cold rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, as well as carbon thin-walled steel pipes, alloy thin-walled steel pipes, and stainless steel pipes. After heat treatment, it is straightened. 

After piercing, the tube blank is cross-rolled by three rolls and continuously rolled. After the quality inspection of the steel pipe, paint the serial number, specification, production batch number, etc.B is the grade in ERW high frequency welded pipe, divided into A and B grades.Tips:ASTM A53 Gr. This piercing machine has high production efficiency, good product quality, large perforation diameter expansion, and can penetrate a variety of steel types. It is hoisted into the warehouse by a crane. After the tube is out of the furnace, it must be pierced by a piercing machine. Hot-rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes. After the steel pipe is straightened, it is sent by the conveyor belt to the metal flaw detector for internal flaw detection. 

After pickling, apply oil. The temperature control in the furnace is a key issue. If there are cracks in the steel pipe, the problem of bubbles and the like will also be picked out.The rolling method of cold drawn seamless steel pipe is more complicated than that of hot rolling, and the first three steps wholesale stainless steel u-tube of their production process are basically the same

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