Finished rolled seamless Steel Pipe for material code of high pressure boiler Use of finish rolled seamless steel pipe: 1, flattened without cracks, can be used for a variety of complex deformation and mechanical processing. Steel pipe color: light gray with white Mainly used for finishing rolled seamless pipes: steel pipes for hydraulic systems, steel pipes for automobiles, and other customers who have high requirements for precision, smoothness, cleanliness and mechanical properties of steel pipes. 2, DIN high-precision black phosphating precision hydraulic steel pipe "phosphorus tube standing stock specification table" Process introduction: The finished tube of DIN high-precision precision bright seamless steel pipe is used as the phosphating steel pipe, and the inner and outer walls are phosphatized with imported environmentally friendly phosphating solution to form a black phosphating protective film, which passes through the phosphating film. The microporous absorption anti-rust oil is used for anti-rust treatment, and the two ends are sealed for dustproof treatment. Main features: color of steel pipe: bright in black, high uniformity of color on the surface of steel pipe, strong consistency, beautiful appearance, good anti-rust performance of steel pipe. Main use: steel pipe for hydraulic system; main product of our company's steel pipe export 3, DIN high precision precision Galvanized Steel pipe Process introduction: The finished tube of DIN high-precision precision bright seamless steel pipe is used as galvanized steel pipe, and the outer wall of steel pipe is cold-galvanized, and the two ends are sealed for dustproof treatment. Main features: color of steel pipe: white zinc, color zinc (yellow zinc), steel pipe outer wall anti-rust, anti-corrosion performance. Note: The galvanizing length is less than 6m. Main use: steel pipe for hydraulic system, users who have high requirements for anti-rust and anti-corrosion of steel pipe outer wall. 4, DIN high precision internal and external galvanized precision steel pipe Process introduction: The finished tube of DIN high-precision precision bright seamless Steel Tube is used as the inner and outer galvanized steel pipe, and the inner and outer walls of the steel pipe are cold-galvanized, or after the galvanization, the military green passivation treatment is performed. Both ends of the cover are dust-proof. Main features: The inner and outer walls of the steel pipe are galvanized or passivated, and the anti-rust and anti-corrosion properties are outstanding. It can be plated with white zinc, colored zinc (yellow zinc) and military green passivation. Note: The length of the steel pipe does not exceed 3m. The main features of the military green passivation tube: outstanding anti-corrosion performance, according to GB/T10125 for neutral salt spray experiments, the experimental time of 240 hours, no red corrosives. Main uses: military industry, automotive industry, railway locomotive industry. Users who have high requirements for rust and corrosion protection on the inner and outer walls of steel pipes. Second, fine rolled bright tube series 1, DIN high precision finishing rolling bright precision seamless steel pipe Process introduction: high-quality Carbon Steel, finishing rolling, non-oxidizing and bright heat treatment (NBK state), non-destructive testing, inner wall of steel pipe is brushed with special equipment and subjected to high pressure washing, antirust oil on steel pipe for antirust treatment, both ends are sealed for dustproof deal with. Main features: high precision and high smoothness of inner and outer wall of steel pipe, no oxidation layer of steel pipe after heat treatment, high cleanliness of inner wall, high pressure of steel pipe, no deformation of cold bending, no cracking, squashing and cracking, can be used for various complex deformation and machining deal with. Color of steel pipe: bright in white, with high metallic luster. Main uses: steel pipes for automobiles, users who have high requirements for precision and smoothness of steel pipes. 2, DIN high precision finishing precision galvanized steel pipe Process introduction: The finished tube of DIN high-precision precision-rolled precision bright seamless steel pipe is used as the steel pipe for galvanizing. The outer wall of the steel pipe is cold-galvanized, and the two ends are sealed for dust-proof treatment. Main features: color of steel pipe: white zinc, color zinc (yellow zinc), high surface finish of steel pipe after galvanizing, anti-rust and anti-corrosion performance of outer wall of steel pipe. Main use: For automotive steel pipes, users who have high requirements for precision, smoothness and corrosion resistance of steel pipes. 3, DIN high precision finishing rolling inside and outside precision galvanized steel pipe Process introduction: The finished tube of DIN high-precision precision rolling bright precision seamless steel pipe is used as the steel pipe for galvanizing. The inner and outer walls of the steel pipe are cold-galvanized, or after the galvanization, the military green passivation treatment is applied. Cover the dust. Main features: color of steel pipe: white zinc, color zinc (yellow zinc), military green passivation. After galvanizing, the inner and outer surfaces of the steel pipe have a high surface finish, and the inner and outer walls of the steel pipe have good rust and corrosion resistance. The main features of the military green passivation tube: outstanding anti-corrosion performance, according to GB/T10125 for neutral salt spray experiments, the experimental time of 240 hours, no red corrosives. Main use: automotive steel pipe, users with high requirements on the inner and outer wall precision, smoothness and corrosion resistance of steel pipes Production of steel pipe specifications: 5-96 * 0.5-7 mouth, flattened without cracks, can be used for a variety of complex deformation and machining processing. Steel pipe color: light gray with white Mainly used for finishing rolled seamless pipes: steel pipes for hydraulic systems, steel pipes for automobiles, and other customers who have high requirements for precision, smoothness, cleanliness and mechanical properties of steel pipes. 2, DIN high-precision black phosphating precision hydraulic steel pipe "phosphorus tube standing stock specification table" Process introduction: The finished tube of DIN high-precision precision bright seamless steel pipe is used as the phosphating steel pipe, and the inner and outer walls are phosphatized with imported environmentally friendly phosphating solution to form a black phosphating protective film, which passes through the phosphating film. The microporous absorption anti-rust oil is used for anti-rust treatment, and the two ends are sealed for dustproof treatment. Main features: color of steel pipe: bright in black, high uniformity of color on the surface of steel pipe, strong consistency, beautiful appearance, good anti-rust performance of steel pipe. Main use: steel pipe for hydraulic system; main product of our company's steel pipe export 3, DIN high precision precision galvanized steel pipe Process introduction: The finished tube of DIN high-precision precision bright seamless steel pipe is used as galvanized steel pipe, and the outer wall of steel pipe is cold-galvanized, and the two ends are sealed for dustproof treatment. Main features: color of steel pipe: white zinc, color zinc (yellow zinc), steel pipe outer wall anti-rust, anti-corrosion performance. Note: The galvanizing length is less than 6m. Main use: steel pipe for hydraulic system, users who have high requirements for anti-rust and anti-corrosion of steel pipe outer wall. 4, DIN high precision internal and external galvanized precision steel pipe Process introduction: The finished tube of DIN high-precision precision bright seamless steel tube is used as the inner and outer galvanized steel pipe, and the inner and outer walls of the steel pipe are cold-galvanized, or after the galvanization, the military green passivation treatment is performed. Both ends of the cover are dust-proof. Main features: The inner and outer walls of the steel pipe are galvanized or passivated, and the anti-rust and anti-corrosion properties are outstanding. It can be plated with white zinc, colored zinc (yellow zinc) and military green passivation. Note: The length of the steel pipe does not exceed 3m. The main features of the military green passivation tube: outstanding anti-corrosion performance, according to GB/T10125 for neutral salt spray experiments, the experimental time of 240 hours, no red corrosives. Main uses: military industry, automotive industry, railway locomotive industry. Users who have high requirements for rust and corrosion protection on the inner and outer walls of steel pipes. Second, fine rolled bright tube series 1, DIN high precision finishing rolling bright precision seamless steel pipe Process introduction: high-quality carbon steel, finishing rolling, non-oxidizing and bright heat treatment (NBK state), non-destructive testing, inner wall of steel pipe is brushed with special equipment and subjected to high pressure washing, antirust oil on steel pipe for antirust treatment, both ends are sealed for dustproof deal with. Main features: high precision and high smoothness of inner and outer wall of steel pipe, no oxidation layer of steel pipe after heat treatment, high cleanliness of inner wall, high pressure of steel pipe, no deformation of cold bending, no cracking, squashing and cracking, can be used for various complex deformation and machining deal with. Color of steel pipe: bright in white, with high metallic luster. Main uses: steel pipes for automobiles, users who have high requirements for precision and smoothness of steel pipes. 2, DIN high precision finishing precision galvanized steel pipe Process introduction: The finished tube of DIN high-precision precision-rolled precision bright seamless steel pipe is used as the steel pipe for galvanizing. The outer wall of the steel pipe is cold-galvanized, and the two ends are sealed for dust-proof treatment. Main features: color of steel pipe: white zinc, color zinc (yellow zinc), high surface finish of steel pipe after galvanizing, anti-rust and anti-corrosion performance of outer wall of steel pipe. Main use: For automotive steel pipes, users who have high requirements for precision, smoothness and corrosion resistance of steel pipes. 3, DIN high precision finishing rolling inside and outside precision galvanized steel pipe Process introduction: The finished tube of DIN high-precision precision rolling bright precision seamless steel pipe is used as the steel pipe for galvanizing. The inner and outer walls of the steel pipe are cold-galvanized, or after the galvanization, the military green passivation treatment is applied. Cover the dust. Main features: color of steel pipe: white zinc, color zinc (yellow zinc), military green passivation. After galvanizing, the inner and outer surfaces of the steel pipe have a high surface finish, and the inner and outer walls of the steel pipe have good rust and corrosion resistance. The main features of the military green passivation tube: outstanding anti-corrosion performance, according to GB/T10125 for neutral salt spray experiments, the experimental time of 240 hours, no red corrosives. Main use: automotive steel pipe, users with high requirements on the inner and outer wall precision, smoothness and corrosion resistance of steel pipes Seamless steel pipe material for seamless pipe plant for high pressure boilers The high-pressure boiler tube is a kind of boiler tube and belongs to the category of seamless steel pipe. The manufacturing method is the same as that of the seamless steel pipe, but there are strict requirements for the steel used for the manufacture of the steel pipe. High-pressure boiler tubes are often used under the premise of high temperature and high pressure. The tubes will oxidize and erode under the action of high temperature flue gas and water vapor. Steel pipes are required to have high durability, high resistance to oxidation and corrosion, and good organization. High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guiding tubes, main steam tubes, etc. for high-pressure and ultra-high pressure boilers. Low and medium pressure boiler tube GB3087-1999, high pressure boiler tube GB5310-1999 is used for manufacturing superheated steam pipes, boiling water pipes and locomotive boiler superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes for various structures. High quality carbon structural steel hot rolled and cold drawn (rolled) seamless steel tubes. Structural seamless steel pipe (GB/T8162-1999) is a seamless steel pipe used for general structural and mechanical structures. Specifications and Appearance Quality: GB5310-95 "Seamless Steel Tube for High Pressure Boiler" The outer diameter of the hot rolled steel tube is 22 to 530 mm and the wall thickness is 20 to 70 mm. The cold drawn (cold rolled) tube has an outer diameter of 10 to 108 mm and a wall thickness of 2.0 to 13.0 mm. The profiled seamless steel pipe is a general term for seamless steel pipes of other cross-sectional shapes other than round pipes. According to the different dimensions of the cross-section of the steel pipe, it can be divided into the same wall thickness profiled seamless steel pipe (code D), the unequal wall thickness profiled seamless steel pipe (code BD), and the variable diameter profiled seamless steel pipe (code BJ). Shaped seamless tubes are widely used in a variety of structural parts, tools and mechanical parts. Compared with the round pipe, the special-shaped pipe generally has a large moment of inertia and a section modulus, and has a large bending and torsion resistance, which can greatly reduce the structural weight and save steel. 4. Chemical composition maintenance (1) GB3087-82 "Seamless steel pipe for low and medium pressure boilers" is delimited. The chemical composition test method is based on the relevant departments in GB222-84 and GB223 "Chemical Analysis Methods for Steel and Alloys". (2) GB5310-95 "Seamless Steel Tube for High Pressure Boiler" is delimited. The chemical composition test method is in accordance with GB222-84 and the "Steel and Alloy Chemical Analysis Methods", GB223 "Steel and Alloy Chemical Analysis Methods". (3) The chemical composition inspection of the inlet boiler steel pipe shall be carried out according to the relevant scale as stipulated in the contract. 5. The boiler tube is made of steel (1) The high-quality carbon structural steel has 20G, 20MnG and 25MnG. (2) Alloy structure steel No. 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB and the like. (3) In addition to the chemical composition and mechanical function of the 1Cr18Ni9 and 1Cr18Ni11Nb boiler tubes, the rust-resistant heat-resistant steels are to be hydraulically tested one by one, and the flaring and flattening tests are to be carried out. The steel pipe is delivered in a heat treated state. In addition, there are certain requirements for the microstructure, grain size and decarburization layer of the finished steel pipe. 6. Physical function maintenance (1) GB3087-82 "Seamless steel pipe for low and medium pressure boilers" is delimited. Pulling test according to GB/T228-87, hydraulic test according to GB/T241-90, flattening test according to GB/T246-97, expansion test according to GB/T242-97, cold bending test according to GB244-97. (2) GB5310-95 "Seamless Steel Tube for High Pressure Boiler" is delimited. The tensile test, hydraulic test and flattening test are the same as GB3087-82; the impact test is according to GB229-94, the expansion test is according to GB/T242-97, the grain size test is according to YB/T5148-93; the microstructure is overhauled. According to GB13298-91, the decarburization layer is repaired according to GB224-87, and the ultrasonic inspection is according to GB/T5777-96. (3) The physical function maintenance and indicators of the inlet boiler tubes shall be carried out according to the relevant scales delineated by the contract. 7. Main import and export situation (1) The main importing countries of boiler tubes are Japan and Germany. Often the inlet specifications are 15914.2 mm; 2734.0 mm; 219.110.0 mm; 41975 mm; 406.460 mm and the like. The smallest size is 31.84.5mm and the length is generally 5~8m. (2) In the case of the entrance claim, the ST45 seamless boiler tube at the entrance of the Mannesmann Steel Tube Plant in Germany was investigated by ultrasonic flaw detection, and it was found that the internal defects of the steel pipe of the small department exceeded the delineation of the plant and the scale of the German Steel Association. (3) Alloy steel pipes imported from Germany, the steel numbers are mainly 34CrMo4 and 12CrMoV. This kind of steel pipe has good high temperature performance and is commonly used as a steel pipe for high temperature boilers. (4) There are many alloy pipes at the entrance of Japan, and the specifications are 426.012mm 5～8m; 152.48.0mm12m; 89.110.0mm6m; 101.610.0mm12m; 114.38.0mm6m; 127.08.0mm9m. The Japanese industry standard JISG3458 steel number is STPA25. This kind of steel pipe is often used as a matching high temperature alloy pipe. 8. Seamless core steel pipe for diamond core drilling (GB3423-82) is a seamless steel pipe for drill pipe, core rod and casing used for diamond core drilling. 9. Oil Drilling Pipe (YB528-65) is a seamless steel pipe used for thickening or external thickening at both ends of oil drilling. There are two kinds of steel pipe and no wire, the wire pipe is connected by a joint, and the non-wire pipe is welded by a butt welding method and a tool joint. 10. Carbon steel seamless steel pipe for ships (GB5213-85) is a carbon steel seamless steel pipe for the manufacture of ship class I pressure pipe system, class II pressure pipe system, boiler and superheater. The working temperature of carbon steel seamless steel pipe wall does not exceed 450 °C, and the working temperature of alloy steel seamless steel pipe wall exceeds 450 °C. 11. Seamless steel pipe for automobile semi-axle casing (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe for the manufacture of automobile semi-axle casing and drive axle housing shaft tube. 12. High-pressure oil pipe for diesel engine (GB3093-2002) is a cold drawn seamless steel pipe for the manufacture of high-pressure pipes for diesel injection systems. 13. Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders (GB8713-88) is a cold drawn or cold rolled precision seamless steel pipe with precision inner diameter for the manufacture of hydraulic and pneumatic cylinders. Galvanized Steel Coil,Galvanized Steel,Hot Rolled Galvanized Steel Ningbo Qiyi Precision Metals Co., Ltd. , http://www.qiyi-metal.com