SSAW Pipe

　　Seamless steel tubes are very useful in the industrial category. There are many types of pipe materials, including small-diameter seamless steel pipes , seamless steel pipes, detailed seamless steel pipes, etc. At the same time, it can be used. The size of the caliber is classified. Whether it is a seamless steel pipe with steel as an important material, the more prudent alloy pipe material, the practicality is extremely wide. They are widely used in pipeline transportation. Generally, large-diameter seamless steel pipe materials are used, which is inconsistent with the popular seamless steel pipes. 　　The seamless steel pipe industry has grown rapidly in the past few years. Why is it so? At first, because of the wide range of applications of this type of pipe material, the demand for seamless steel pipes continues to increase, and the demand for this type of pipe material continues to grow. At the same time, it is gradually familiar with its actual and popular pipe materials. The a...

　　 First floor: Working steel pipe 　　According to the design and customer requirements, the seamless steel pipe (GB8163-87) spiral welded pipe (GB9711-88; SY/T5038-92) and straight seam welded pipe (GB3092-93) are generally selected. After the surface of the steel pipe is treated with advanced shot blasting, the derusting grade of the steel pipe can reach Sa2 grade in GB8923-1988 standard, and the surface roughness can reach R=12.5 micron in GB6060.5-88 standard. 　　Second layer: Polyurethane insulation 　　A high-pressure foaming machine is used to inject the rigid polyurethane foam raw liquid into the cavity formed between the outer sheaths at one time. This is commonly known as the "tube-in-tube foaming process." One of its functions is waterproof, the other is thermal insulation, and the third is to support the heat network. When the medium temperature is: -50 °C -120 °C, use rigid polyurethane foam insulation layer. 　　Third layer: high-density polyethylene protectiv...

　　 Seamless steel pipe is a long strip of steel with a hollow section and no joints around it. It is widely used in pipelines for conveying fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, seamless steel pipe has light weight and is an economical section steel with the same bending and torsional strength. It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes and automobile transmissions. Shafts, bicycle frames and steel scaffolding used in construction. 　　The use of seamless steel tubes to manufacture ring-shaped parts can improve material utilization, simplify manufacturing processes, save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., and nowadays are widely made of seamless steel pipes. Steel pipes are also indispensable materials for various conventional weapons, and barrels, barrels, etc. are ...

　　The pickling process acid pickling solution is generally a mixture of various acids, mainly sulfuric acid, nitric acid and hydrofluoric acid, etc. These mixed acids are highly corrosive and have a strong oxidizing property and a high temperature of corrosive medium. This puts high demands on the corrosion resistance of anticorrosive materials. Stainless steel seamless steel pipe pickling production line process from production to waste gas recovery system, there is a strong corrosion state in all aspects, so the choice of anti-corrosion materials is directly related to the environmental recovery system of equipment, workshop floor, trench, waste water and waste gas Normal use of etc. 　　 Seamless steel pipe pickling process 　　The pickling of seamless steel tubes uses solvents and emulsions to clean the surface of welded steel pipes for low-pressure fluid transport to remove oil, grease, dust, lubricants and similar organic matter, but it does not remove rust, scale, etc. from the...

　　The steel flower pipe is made of a lot of small eyes on the basis of the steel pipe. Its main function is grouting. Generally, it is widely used in the construction of the project. For the steel flower tube, its grouting effect. It is better. 　　Steel pipe is a kind of steel, not only used in engineering, but also used in building materials and machinery. The type and model of steel pipe are much more than steel pipe, and the function is more than steel pipe. The production process is more complicated, and the use is relatively straightforward. The technical performance required is higher and generally cannot be satisfied. 　　The difference between the steel flower pipe and the steel pipe is relatively large and should be distinguished in use. 　　Steel flower pipe conventional specifications: Φ42mm, Φ48mm, Φ50mm, Φ60mm, Φ89mm, Φ108mm. Can be customized according to special requirements. 　　Steel flower pipe construction process: a. Measure the pile position, drill with the drill,...

　　1: Thick-walled seamless steel pipe castability (castability): refers to the ability of metal materials to obtain qualified castings by casting. Casting properties mainly include fluidity, shortening and segregation. Fluidity refers to liquid metal filling molds. Capability, shortening refers to the degree of volume shortening when the casting is condensed. Segregation refers to the non-uniformity of the chemical composition and arrangement of the metal during the cooling and condensation process due to the difference in crystallization. 　　2: Thick wall seamless steel tube forgeability: refers to the metal material can change the shape without cracking during pressure processing. It can be hammered, rolled, stretched, twisted in hot or cold state. Pinch and other processing. The quality of forgeability is primarily related to the chemical composition of metal materials. 　　3: Thick-walled seamless steel pipe machinability (cuttability, machinability): refers to the ease with whic...

　　High-precision seamless steel tubes generally improve the properties of the materials by adding alloys to the metal. After cold drawing, the seamless steel tubes need to be subjected to stress relief annealing to eliminate residual stress of the materials, improve the structure of the materials, and improve the material. Plasticity, so as to prevent the occurrence of fracture failure of seamless steel pipe . 　　At present, the material of the stainless steel seamless steel pipe is ordinary 45# or 20# steel 27SiMn steel, and the strength of the metal is improved by cold drawing deformation; however, it is at the expense of the plasticity and toughness of the sacrificial metal. High-precision cold-drawn seamless steel pipe is based on its high dimensional accuracy and high strength performance. It must ensure that the deformation amount is within a certain range to maximize the performance of the material and reduce the material negative effects. 　　The deformation of the seamless st...

　　 Seamless steel tube heat treatment is divided into three categories: 　　(1) Final heat treatment to meet the performance requirements of seamless steel products; 　　(2) heat treatment in the heat treatment state required by users and standards; 　　(3) heat treatment between processes in the steel pipe manufacturing process. 　　The commonly used heat treatment processes for seamless steel tubes mainly include quenching, tempering, normalizing and annealing. For example: casings, oil pipes, drill pipes, line pipes, etc. in oil special pipes, according to the level of steel grade, the normalizing, normalizing and tempering, quenching and tempering processes are adopted accordingly; 　　High-pressure boiler tubes and high-pressure fertilizer pipes often use normalizing, normalizing and tempering, quenching and tempering (thick-walled pipes) and solid solution treatment of austenitic stainless steel pipes; spheroidizing annealing of steel pipes for bearings. 　　Some alloy steel pip...

　　1. Seamless steel pipe cutting treatment problem 　　After the seamless steel pipe is straightened, the initial inspection of the soot is performed to determine the length of the cutting head and the tail. The purpose of the seamless steel pipe cutting is to remove the ends with cracks, knots, ridges, tears and uneven wall thickness to obtain the required fixed-length seamless steel pipe. 　　In addition, the defects that are difficult to save after being inspected after the examination are removed, such as internal folds, internal scars, and severe wall thickness unevenness. Generally, the cutting of the former is performed on the line, while the latter is cut off offline. 　　2. Control of holding time of heat treatment of seamless steel tubes 　　The heat preservation time of the seamless steel tube during heat treatment should ensure that the steel tube in the furnace can be completely fired, the temperature is uniform, and the desired tissue transformation is completed, thereby...

　　Precautions for the preservation of seamless steel tubes: 　　1. The site or warehouse for storing steel, whether it is seamless steel pipe or other straight seam steel pipe, should be selected at the midpoint of clean and clean, poor drainage, away from the occurrence of harmless gas or dust. Weeds and all kinds of debris should be cleared on the site, and the steel should be clean; 　　2. Do not stack materials that are corrosive to steel, such as acid, alkali, salt or cement, in the warehouse. Different types of steel should be identified and stacked to avoid mixing and avoid contact corrosion; 　　3. Large-scale steel, rail, insult steel plate, large-diameter steel pipe, forgings, etc. can be stacked in the open air; 　　4. Small and medium-sized steel, wire rod, steel, medium-diameter steel pipe, steel wire and wire rope, etc., can be stored in a well-ventilated shed, but must be placed on the underside; 　　5. Some small steel, thin steel, steel, silicon steel, small-diameter o...

　　According to different production methods, seamless steel pipe production process can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe and extruded pipe. 　　1. Hot-rolled seamless pipes are generally produced on automatic rolling mills. The solid tube blank is inspected and the surface defects are removed, cut into the required length, centered on the end face of the perforated end of the tube blank, then sent to a heating furnace for heating and perforated on the punching machine. At the same time, the perforation is continuously rotated and advanced. Under the action of the roll and the head, a cavity is gradually formed inside the tube blank, which is called a capillary tube. It is sent to the automatic pipe mill for further rolling. Finally, the whole machine is uniform in wall thickness, and the sizing machine is sizing to meet the specification. The production of hot-rolled seamless steel tubes by continuous rolling mills is a more advanced method. 　　2. If...

　　The bearing capacity of a lsaw steel pipe is related to two points. One point is the mechanical properties of the steel, which is related to the commonly stated yield point, tensile strength, elongation and impact toughness. The other point is related to the geometrical characteristics of the section. Generally, a circular straight welded pipe has the strongest resistance to local buckling, and thus it is the best member to withstand radial internal pressure and radial external pressure. 　　Under the same steel number, equal area and the same supporting conditions, the rectangular slanted steel pipe has strong eccentric compression bearing capacity, and the circular and square steel tubes have the strongest compressive bearing capacity, but the square and rectangular lsaw steel pipes are subject to the ability of the nip to resist local buckling is not as good as that of a circular steel tube. Compared with the lsaw steel pipe, the seamless steel pipe has a complicated production p...

　　Small-diameter thick-walled seamless pipes are steel pipes with a small ratio of outer diameter to wall thickness. How should such steel pipes be heat treated? 　　1. The repaired parts need to be normalized during the heat treatment process. The normalizing is a heat treatment process of heating the small-diameter thick-walled tubes of seamless steel tubes to 45 ° C above Ac3, and after cooling for a suitable time, in a static air. Structural parts requiring mechanical properties require quenching after normalizing to meet mechanical performance requirements. Medium and high alloy steels and large forgings require high temperature tempering after normalizing to eliminate the internal stress generated during normalizing. 　　2. Annealing treatment of small-diameter thick-walled tubes of seamless steel tubes is a heat treatment process in which metals and alloys are heated to a suitable temperature for a certain period of time and then slowly cooled. After annealing, the sub-eutectoid...