The expression method of seamless steel pipe is outer diameter, wall thickness, thick wall seamless steel pipe is mainly used for mechanical processing, coal mine, hydraulic steel and other purposes. The material of thick wall seamless steel pipe is divided into 10#, 20#, 35#, 45#, 20Cr, 40Cr, 42CrMo, 16Mn, 27SiMn, 12Cr1MoV, 10CrMo910, 15CrMo, 35CrMo, etc.lg...

Thick wall seamless pipe production is divided into cold drawing and hot rolling, the material is divided into ordinary pipe, alloy pipe. According to the use of the structure is divided into seamless steel pipe; Seamless steel pipe for conveying; Seamless steel pipe for boiler; High pressure seamless steel pipe for boiler; High pressure seamless steel pipe for fertilizer equipment; Seamless steel pipe for geological brick exploration; Seamless steel pipe for petroleum brick exploration; Seamless steel pipe for petroleum cracking; Seamless steel pipe for ships; Cold-drawn cold-rolled precision seamless steel pipe; All kinds of alloy tubes.lg...

Hormann Citic Pacific Cold-rolled seamless pipe (GB3639-2000) is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment. In addition to the general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, also includes carbon thin-wall steel pipe, alloy thin-wall steel pipe, stainless thin-wall steel pipe, special-shaped steel pipe. The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-75mm, the diameter of the cold-rolled seamless steel pipe can be up to 6mm, the wall thickness can be up to 0.25mm, the outer diameter of the thin-walled pipe can be up to 5mm, the wall thickness is less than 0.25mm, and the size accuracy is higher than that of the hot-rolled seamless pipe.lg...

Hormann Citic Pacific Seamless tube for general structure and mechanical structure (GB/T8162-87) (2) Seamless tube for low and medium pressure boiler (GB/T3087-1999) (3) Seamless tube for high pressure boiler ST45.8/111 (GB/T5310-85) (4) Seamless tube for conveying fluid (GB/T8163-1999) (5) Cold-drawn or cold-tied precision seamless pipe (GB/T3639-83) (6) Geological drilling steel pipe (YB235-70) (7) Oil drilling steel pipe (YB528-65) (8) hydraulic cylinder precision inner diameter seamless pipe (GB8713-88) (9) fertilizer special seamless pipe (GB6479-86) (10) Marine pipe (GB5312-85) (11) Oil cracking pipe (GB9948-88) (12) Various alloy pipe 16Mn 27SiMn 15CrMo, 35CrMo 12CrMov 20G 40Crlg...

Hormann Citic Pacific Precision seamless steel pipe, precision hydraulic seamless steel pipe, cold-drawn precision seamless steel pipe, cold-rolled precision seamless steel pipe, high-precision seamless steel pipe, precision bright seamless steel pipe. (1) Main types of steel pipe: DIN series high-precision bright seamless steel pipe, special steel pipe for hydraulic system, special steel pipe for automobile manufacturing (2) Main standard: DIN2391, DIN2445, EN10305, DIN1629, DIN1630, ASTM A179(3) Main material: ST35 (E235) ST37.4 ST45 (E255) ST52 (E355) Cold-drawn precision seamless steel pipe Main delivery status: NBK (+N) GBK (+A) BK (+C) BKW (+LC) BKS (+SR) (5) Main features: no oxide layer on the inner and outer walls of the steel pipe, no leakage under high pressure, high precision, high finish, cold bending without deformation, flaring, flattening without cracks.lg...

Hormann Citic Pacific Hot-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes. Generally used seamless steel pipe: is made of 10, 20, 30, 35, 45 and other high-quality carbon junction steel 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolled. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transport pipelines. The seamless pipe made of 45# steel, 40Cr and other medium carbon steel is used to manufacture mechanical parts, such as the stressed parts of automobiles and tractors. Generally use seamless steel pipe to ensure the strength and flattening test. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated condition.lg...

Hormann Citic Pacific Hot-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes. Residual stress due to uneven cooling. Residual stress is the internal self-equilibrium stress in the absence of external force. Hot-rolled steel of various sections has such residual stress. The larger the section size of general steel, the greater the residual stress. Although the residual stress is self-equilibrium, it still has a certain effect on the performance of steel members under external forces. Such as deformation, stability, anti-fatigue and other aspects may have adverse effects. Hot rolled steel products are difficult to control in terms of thickness and side width. Everyone is familiar with thermal expansion and cold contraction, because at the beginning of hot rolling out even if the length and thickness are up to standard, there will be a certain negative difference after cooling, and the wider the negative difference edge width, the thicker the thickness, the more obvious the performance. Therefore, for large steel, the side width, thickness, length, Angle, and edge line of the steel can not be required to be too precise.lg...

In view of the production process characteristics of hot-rolled seamless steel pipe, such as multi-variety, small batch, multi-production stage and flexible production path, the integrated scheduling optimization problem for the whole production process was studied based on the actual production environment of Hormann an gang steel pipe plant. Based on the description of the batch problem and the design of the solution of the single-stage scheduling optimization problem, an integrated production scheduling decision support system for the whole production process was developed based on the management information system of Hormann an gang steel pipe plant The design idea, function flow, data processing mode and basic function module are applied. The system can efficiently provide production planning and scheduling schemes for planners, which not only greatly improves work efficiency, but also shows obvious advantages in many aspects compared with manual planning schemes of planners.lg...

Galvanized steel pipe is divided into cold galvanized steel pipe, hot galvanized steel pipe, cold galvanized steel pipe has been banned, the latter is also advocated by the state can be used temporarily. In the 1960s and 1970s, the developed countries in the world began to develop new types of pipes and gradually banned galvanized pipes. China's Ministry of Construction and other four ministries and commissions have also issued a document to prohibit galvanized pipes as water supply pipes from 2000, the cold water pipes in the new community have rarely used galvanized pipes, and the hot water pipes in some communities use galvanized pipes. Hot-dip galvanized steel pipe has a wide range of applications in fire, power and highwaylg...

Hot-dip galvanized steel pipe is widely used in construction, machinery, coal mine, chemical industry, electric power, railway vehicles, automobile industry, highways, Bridges, containers, sports facilities, agricultural machinery, petroleum machinery, prospecting machinery, greenhouse construction and other manufacturing industries. Galvanized steel pipe Welded steel pipe with hot dip plating or electrogalvanized coating on the surface. Galvanizing can increase the corrosion resistance of the steel pipe and extend the service life. Galvanized pipe has a wide range of uses, in addition to the pipeline pipe for water, gas, oil and other general low pressure fluids, it is also used as the oil well pipe, oil pipeline, especially in the oil field of the petroleum industry, the oil heater, the condensing cooler of the chemical coking equipment, the tube for the coal distillation and washing oil exchanger, and the pipe for the trestle pipe pile and the support frame of the mine tunnellg...

Hot-dip galvanized pipe Hot dip galvanized pipe is the reaction of molten metal with iron matrix to produce alloy layer, so that the matrix and the coating are combined. Hot dip galvanizing is to first pickling the steel pipe, in order to remove the iron oxide on the surface of the steel pipe, after pickling, through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank for cleaning, and then into the hot dip plating tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. The matrix of hot dip galvanized steel pipe and the molten bath undergo complex physical and chemical reactions to form a tight zinc-iron alloy layer with corrosion resistance. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix, so its corrosion resistance is strong. Cold galvanized pipe Cold galvanized pipe is electric galvanized, galvanized amount is very small, only 10-50g/m2, its own corrosion resistance is much different than hot galvanized pipe. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electric galvanizing (cold plating). Only those small enterprises with obsolete equipment use electric galvanizing, of course, their prices are relatively cheap. The Ministry of Construction has formally announced the elimination of cold galvanized pipes with backward technology, and it is not allowed to use cold galvanized pipes as water and gas pipes. The galvanized layer of cold galvanized steel pipe is an electric coating, and the zinc layer is independently layered with the steel pipe matrix. The zinc layer is thin, and the zinc layer is simply attached to the steel tube matrix and easy to fall off. Therefore, its corrosion resistance is poor. In new residential buildings, it is prohibited to use cold galvanized steel pipes as water supply pipes.lg...

Carbon steel pipe is made of ingot or solid round steel through perforation to make a tube, and then hot rolled, cold rolled or cold drawn to make. Carbon steel pipe plays an important role in China's steel pipe industry.Carbon steel pipes are divided into hot rolled and cold rolled (drawn) steel pipes. Hot rolled carbon steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes.lg...

Cold rolled (dial) carbon steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, other steel pipe, also includes carbon thin-wall steel pipe, alloy thin-wall steel pipe, stainless thin-wall steel pipe, special-shaped steel pipe. The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-75mm, the outer diameter of the cold-rolled seamless steel pipe can be 6mm, the wall thickness can be 0.25mm, the outer diameter of the thin-walled pipe can be 5mm, the wall thickness is less than 0.25mm, and the size accuracy is higher than that of the hot-rolled seamless pipe. General carbon steel pipe: is made of 10, 20, 30, 35, 45 and other high-quality carbon junction steel 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolled or cold rolled. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transport pipelines. 45, 40Cr and other medium carbon steel seamless pipe to manufacture mechanical parts, such as cars, tractor parts. Generally used carbon steel pipe to ensure strength and flattening test. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated condition; Delivered cold rolled in heat-treated condition.lg...

The raw material of the carbon steel pipe is a round tube blank, and the round tube embryo is cut by the cutting machine and the growth of the blank is about 1 meter, and is sent to the furnace by the conveyor belt for heating. The billets are heated in a furnace at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is the key problem. After the round tube billet is released, it must be perforated by the pressure piercing machine. Generally, the most common piercing machine is the conical roll piercing machine, which has high production efficiency, good product quality, large perforating and expanding diameter, and can wear a variety of steel. After the perforation, the round tube blank is successively rolled by three roller skew, continuous rolling or extrusion. After extrusion, the tube should be removed for sizing. The sizing machine rotates into the steel embryo at high speed through the conical drill to punch holes and form the steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the caliper drill bit. After the steel pipe is calibrated, it enters the cooling tower and is cooled by water spray. After the steel pipe is cooled, it will be straightened. After the steel pipe is straightened, it is sent to the metal inspection machine (or hydraulic test) for internal inspection. If there are cracks, bubbles and other problems inside the steel pipe, it will be detected. After the steel pipe inspection, it is also strictly selected by hand. After the steel pipe quality inspection, paint the number, specification, production batch number, etc. And hoisted by crane into the warehouselg...