Carbon steel elbow manufacturer, carbon steel elbow manufacturer direct sales

规格：

DN65

Manager Liu Xiaolei) Seamless elbow pipe fittings play an important role in my country's pipe fittings industry. According to incomplete statistics, there are approximately 100 seamless elbow pipe fittings manufacturers in my country, and approximately 10,000 tons of seamless elbow pipe fittings units. Judging from the caliber, ＜ accounts for 3, and ＜- accounts for 3. In terms of varieties, general-purpose pipes account for more than 10,000 tons, accounting for 10,000 tons of oil pipes, accounting for more than 10,000 tons of hydraulic props and precision pipes, and accounting for 50,000 tons of stainless steel stamping elbow pipe fittings, bearing pipes, and automobile pipes. Seamless elbow pipe fittings are divided into two types: hot-rolled (extrusion) seamless elbow pipe fittings and cold-drawn (rolled) seamless elbow pipe fittings due to different manufacturing processes. Cold drawn (rolled) pipes are divided into round pipes and special-shaped pipes.
The process flow is briefly introduced as follows:
1. Cold drawn (rolled) seamless elbow pipe fittings: round tube billet rrr heating rrr perforation rrr heading rrr annealing rrr pickling rrr oiling (copper plating ) rrr multi-pass cold drawing (cold rolling) rrr billet tube rrr heat treatment rrr straightening rrr hydraulic test (flaw detection) rrr marking rrr storage.
The rolling method of cold drawn (rolled) seamless steel pipe is more complicated than hot rolling (extruded seamless elbow pipe fittings). The first three steps of their production process are basically the same. The difference starts from the fourth step. After the round tube blank is hollowed out, it needs to be headed and annealed. After annealing, special acidic liquid should be used for pickling. After pickling, apply oil. Then it is followed by multiple passes of cold drawing (cold rolling) and then special heat treatment. After heat treatment, it is straightened. After straightening, the steel pipe is sent to the metal flaw detector (or hydraulic test) by a conveyor belt for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, they will be detected. After quality inspection, steel pipes must undergo strict manual selection. After the quality inspection of the steel pipe, spray the serial number, specification, production batch number, etc. with paint. And it is hoisted into the warehouse by a crane.
2. Hot rolling (extrusion of seamless elbow pipe fittings): round tube billet rrr heating rrr perforation rrr three-roll cross rolling, continuous rolling or extrusion rrr detubing rrr sizing (or diameter reduction) rrr cooling rrr Straightening rrr Hydraulic test (or flaw detection) rrr Marking rrr Storage
The raw material for rolling seamless elbow pipe fittings is round tube blanks, which must be cut by a cutting machine into a length of about one meter. The billet is sent to the furnace for heating via a conveyor belt. The billet is fed into the furnace and heated to a temperature of approximately degrees Celsius. The fuel is hydrogen or acetylene. Temperature control in the furnace is a key issue. After the round tube comes out of the furnace, it must be pierced through a pressure punching machine. Generally, the more common piercing machine is the tapered roller piercing machine. This kind of piercing machine has high production efficiency, good product quality, large perforation diameter expansion, and can wear a variety of pipe fittings. After perforation, the round tube blank is successively cross-rolled, continuous rolled or extruded by three rollers. After extrusion, the pipe should be removed and calibrated. The sizing machine uses a conical drill bit to rotate at high speed into the steel blank to drill holes to form pipe fittings. The inner diameter of the pipe fitting is determined by the outer diameter length of the sizing machine drill bit. After the pipe fittings are sized, they enter the cooling tower and are cooled by spraying water. After the pipe fittings are cooled, they are straightened. After straightening, the pipe fittings are sent by a conveyor belt to a metal flaw detector (or hydraulic test) for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, they will be detected. Seamless elbow pipe fittings must undergo strict manual selection after quality inspection. After the quality inspection of seamless elbow pipe fittings, spray the serial number, specification, production batch number, etc. with paint. Seamless elbow and lifted into the warehouse by crane.
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