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Dongguan Lianshun Precision Pipe Fittings Manufacturing Co., Ltd. is a manufacturer specializing in the production of stainless steel pipes, stainless steel seamless pipes, stainless steel capillary pipes, stainless steel precision pipes, stainless steel welded pipes, stainless steel square pipes and pipe fittings products. Types of stainless steel seamless pipes
Press The rolling methods are divided into hot rolling, hot extrusion and cold drawn (rolled) stainless steel pipes.
According to the different metallographic structures of stainless steel, it can be divided into semi-ferritic, semi-martensitic stainless steel seamless pipes, martensitic stainless steel seamless pipes, austenitic stainless steel seamless pipes, austenitic ferritic iron-based stainless steel seamless pipes, etc. .
Specifications and appearance quality
According to the regulations of stainless steel seamless steel pipes, the length of steel pipes is usually hot-rolled steel pipes (indeterminate length), and hot-extruded steel pipes are equal to and greater than. The wall thickness of cold drawn (rolled) steel pipe is greater than,.
The diameter of hot-rolled (hot-extruded) steel pipes is the same as the wall thickness. Cold drawn (rolled) steel pipe diameter ~ wall thickness.
There must be no cracks, folds, cracks, cracks, rolling, peeling layers and scarring defects on the inner and outer surfaces of the steel pipe. These defects should be completely removed (except for pipes for mechanical processing). After removal, the wall thickness and outer diameter must not exceed the negative deviation. Other minor surface defects that do not exceed the allowable negative deviation do not need to be removed.
The allowable depth of the straight track. The diameter of hot-rolled and hot-extruded steel pipes is less than or equal to the nominal wall thickness, and the maximum depth is not greater than that of drawn (rolled) steel pipes. If the wall thickness is greater than the nominal wall thickness, the maximum depth shall not be greater than
The ends of the steel pipe should be cut at right angles and burrs removed. Manufacturing process of stainless steel seamless pipes
Rolled (extruded seamless steel pipe) round tube blanks are heated and perforated Three-roll cross rolling, continuous rolling or extrusion, detubing, sizing (or diameter reduction), cooling, straightening, hydraulic test (or flaw detection), marking and warehousing
The raw materials for rolling seamless pipes are round tube blanks and round tube embryos It needs to be cut by a cutting machine into a billet of about one meter in length, and sent to the furnace for heating via a conveyor belt. The billet is sent to the furnace for heating, and the temperature is about degrees Celsius. The fuel is hydrogen or acetylene. Temperature control in the furnace is key. The problem is that after the tube blank is released from the furnace, it must be pierced through a pressure punching machine. Generally, the more common piercing machine is the tapered roller piercing machine. This type of piercing machine has high production efficiency, good product quality, large perforation diameter expansion, and can pierce a variety of Steel type. After perforation, the round tube blank is successively rolled or extruded by three-roll cross-rolling. After extrusion, the tube must be removed for sizing. The sizing machine rotates the conical drill bit at high speed into the steel blank to drill holes to form a steel pipe. Steel pipe The inner diameter is determined by the outer diameter length of the drill bit of the sizing machine. After the steel pipe is sized, it enters the cooling tower and is cooled by spraying water. After the steel pipe is cooled, it will be straightened. After straightening, the steel pipe is sent to the metal pipe by a conveyor belt A flaw detector (or hydraulic test) performs internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, they will be detected. After the steel pipe quality inspection, strict manual selection is required. After the steel pipe quality inspection, the steel pipe is sprayed with number specifications with paint. Production batch number, etc. and are hoisted into the warehouse by a crane.
Drawing (rolling) seamless steel tube round tube billet heating, perforation, heading, annealing, pickling, oiling (copper plating), multi-pass cold drawing (cold rolling) billet tube heat treatment The straightening hydraulic test (flaw detection) mark is stored in the warehouse.
The rolling method of cold-drawn (rolled) seamless steel pipe is more complicated than that of hot-rolled (extruded seamless steel pipe). The first three steps of their production process are basically the same .The difference starts from the fourth step. After the round tube is hollowed out, it needs to be headed and annealed. After annealing, it needs to be pickled with a special acidic liquid. After pickling, it is coated with oil. Then it is followed by multiple passes. After cold drawing (cold rolling), the billet pipe undergoes special heat treatment. After heat treatment, it will be straightened. After straightening, the steel pipe is sent to the metal flaw detector (or hydraulic test) by the conveyor belt for internal flaw detection. If there are any defects inside the steel pipe Cracks, bubbles and other problems will be detected. After the steel pipe quality inspection, strict manual selection is required. After the steel pipe quality inspection, the steel pipe is sprayed with paint on the serial number, specification, production batch number, etc. and is hoisted into the warehouse by a crane.
Production and manufacturing methods
According to different production methods, they can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, etc.
Hot-rolled seamless pipes are generally produced on automatic pipe rolling units. Solid tube blanks are processed by Check and remove surface defects, cut it into the required length, center it on the perforated end of the tube blank, then send it to the heating furnace for heating, and pierce it on the punching machine. It continues to rotate and advance during piercing holes. Under the influence of the rollers and the end, the tube blank is hollow gradually, which is called gross pipe. Then it is sent to the automatic pipe rolling machine to continue rolling. Finally, the wall thickness is evened by the leveling machine, and the diameter is determined by the sizing machine to meet the specification requirements. The use of continuous pipe rolling units to produce hot-rolled seamless steel pipes is a more advanced method.
If you want to obtain seamless pipes with smaller size and better quality, you must use cold rolling and cold drawing or a combination of the two. Cold rolling is usually carried out on a two-roll mill, and the steel pipe is rolled in an annular pass composed of a variable cross-section circular groove and a fixed conical head. Cold drawing is usually performed on a single-chain or double-chain cold drawing machine.
The extrusion method is to place the heated tube blank in a closed extrusion cylinder, and the perforation rod and the extrusion rod move together to make the extrusion part extruded from the smaller die hole. This method can produce steel pipes with smaller diameters.
Chemical composition inspection
The chemical composition of domestic seamless pipes supplied according to chemical composition and mechanical properties, such as Hehao steel, should comply with the regulations of /. Imported seamless pipes are inspected according to relevant standards stipulated in the contract. The chemical composition of steel should comply with the regulations.
For specific analysis methods, refer to the relevant parts of chemical analysis methods for steel and alloys.
The analysis deviation refers to the allowable deviation of the chemical analysis sample of steel and the chemical composition of the finished product.
Physical performance inspection
Domestic seamless pipes supplied according to structural performance, ordinary carbon steel are manufactured according to / Class A steel (but it must be ensured that the sulfur content does not exceed and the phosphorus content does not exceed its mechanical properties Should comply with the values stipulated in the table.
Domestic seamless pipes supplied according to the hydraulic pressure test must ensure the hydraulic pressure test specified in the standard.
The physical properties of imported seamless pipes shall be inspected according to the relevant requirements stipulated in the contract. Standards are carried out.
Use Seamless pipes are widely used. General-purpose seamless pipes are rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel. They have the largest output and are mainly used as pipes or structures for conveying fluids. Parts.
They are divided into three categories according to different uses. They are supplied according to chemical composition and mechanical properties. They are supplied according to mechanical properties and supplied according to hydraulic pressure test. Steel pipes supplied according to categories, if used to withstand liquid pressure, must also undergo hydraulic pressure testing.
Special-purpose seamless pipes include seamless pipes for boilers, seamless pipes for geology, and seamless pipes for petroleum.
Types
Seamless steel pipes can be divided into different production methods. Hot-rolled tubes, cold-rolled tubes, cold-drawn tubes, extruded tubes, etc.
According to the shape classification, there are round tubes and special-shaped tubes. In addition to square tubes and rectangular tubes, special-shaped tubes also include oval tubes, semi-circular tubes, triangular tubes, and hexagonal tubes. Convex-shaped tubes, plum-shaped tubes, etc.
According to different materials, they are divided into ordinary carbon structural tubes, low alloy structural tubes, high-quality carbon structural tubes, alloy structural tubes, stainless steel tubes, etc.
According to special purposes , including boiler tubes, geological tubes, petroleum tubes, etc.
Stainless steel seamless tube specifications
Stainless steel flat tube copy