Seamless Steel Pipe

　　We all know that hot rolled and cold drawn process are 2 traditional heat treatment methods of steel pipes , What are the advantages of cold drawn processes ? Today, let's go to find the answers. 　　(1) Cold drawn processes can be adopted to produce thin wall pipes, extremely thin wall pipes and large diameter thin-wall pipes, small diameter pipes, capillary pipes, and all kinds of special-shaped and variable section pipes or pipe fittings. 　　(2) Cold drawn processes can be used to produce steel pipes with high dimensional accuracy and high surface finish. 　　(3) The cold working steel pipe can obtain high comprehensive mechanical properties, because the process of cold drawn contributes to refining the metal grain and matching the corresponding heat treatment.

　　The term Oil Country Tubular Goods(OCTG) describes tubes that are used in oil and gas production. This can mainly include drill pipe, casing or tubing pipes . 　　Drill pipe refers to the heavy tubes, usually seamless, used in the rotation of the drill bit and also the drilling fluid, to which they can be joined together using tool joints. The pipe is subject to axial tension (due to it’s own dead weight while in use), high internal pressure and extremely high torque. 　　Casing Pipe is the pipe used to line the borehole, which is the actual hole dug into the ground to get to the oil. Like the drill pipe, it too is subject to axial tension. 　　Tubing Pipe is the pipe that goes inside the casing pipe. This is the pipe that the oil itself will eventually make its way out of.

　　Hot induction bend, steel pipe and so on are working for seamless steel pipe or welded tube’s joint. It could be one of the best partner for steel pipe’s engineering work. Today, let’s enter the world of steel bend. 　　Most of us are familiar with bend as it was applied widely in industries nowadays. Today, we would have a basic information for it. 　　Type: 　　Primesteeltube would supply you with pipe bend, steel pipe bend, hot bend, induction bend and so on. Contacting us for more details. 　　Material: 　　There are several types of it according to the different elements. For example: 　　Carbon steel: API 5L, ASME B16.49, EN 10218 　　Alloy steel: ASTM A234 　　Stainless steel: ASTM 312/403 304/304L/316/316L/613Ti/321/317L/310S 　　Specification would be include these: 　　NPS from 1/2'' to 72'', 　　DN from 15 to 1800, 　　WT: <120mm, 　　SCH 40/80/XXS 　　For bend radius types, angel categories, surface and packing, you can contact with us for more detaile...

　　With the development of oil weather or other goods transmission environment, we should know that remote areas, oceans, and cold regions are also necessary to be considered even when we use seamless steel pipe for transport tools. 　　Today, we would have a view for general comparison for API seamless steel pipe. There are three types of this category. They are: 　　API 5L: Line pipe for pipeline transportation systems; 　　API 5CT: Tubing and casing for wells; 　　API 5DP: Drill Pipe for well drilling. 　　Different grades would cause different effect during the transmission. Under this situation, it is necessary to figure out what’s your engineering project before determination for the API pipe’s choosing.

　　There are more than 60 sets of extrusion units in the world. Except for a few for profile extrusion, 70% of the units are used for the production of steel pipes. The main type is stainless steel pipes. Compared with the rolling (longitudinal and cross-rolling) production methods, the extrusion method is characterized by three-way compressive stress during metal deformation. Under this optimal stress state, for stainless steel tubes with large steel numbers and large deformation resistance, good deformation, internal and external surface quality and metallographic structure can be obtained. 　　The improvement of the vertical hydraulic perforation process equipment can make the deviation accuracy of the wall thickness of the waste pipe after extrusion reach 5%~7%. The extrusion die is simple, easy to manufacture and replace, and is suitable for the production of small batch and multi-size stainless steel pipes. The extrusion unit can also produce steel pipes with a wide range of speci...

　　(1) The geometrical characteristics of the straight seam steel pipe section are good, the pipe wall is generally thin, the section material is distributed around the centroid, the section has a large radius of gyration, and has strong torsional rigidity; as a compression, bending and bidirectional bending member, The bearing capacity is high, and the straightness and cross-sectional dimension of the cold-formed pipe are more accurate than the cross-section of the hot-rolled opening. 　　(2) In terms of anti-hydrodynamic characteristics, the cross section of the round pipe is the best, and the effect of wind and water flow is greatly reduced. The cross section of the rectangular tube is similar to this in this respect. 　　(3) The steel pipe is a closed section; in the case of the same average thickness and cross-sectional area, the exposed surface area is about 50% to 60% of the opening section, which is advantageous for corrosion prevention and can save the coating material. 　　(4)...

　　1. Medium and heavy plate unit: It is an important production wide and thick plate for the production of straight seam submerged arc welded pipe , which is widely used in the main line of oil and gas high pressure transportation. 　　2. Furnace rolling mill: The furnace rolling mill includes a reciprocating roughing mill and a 4-roller to the finishing mill. 　　3. Semi-continuous rolling mill: including 1 rack furnace rolling mill and 5 rack finishing mill. On a semi-continuous rolling mill, the hot rolling experienced by the pipe in the finishing pass is substantially constant from one end of the pipe to the other. The time between the passes on the finishing mill is less than 3s on weekdays. 　　The output roller road includes a laminar cooling system and a take-up station. On the furnace rolling mill, the thermomechanical history of the entire length of stainless steel stamped elbow fittings has changed significantly, especially in the production of micro-stainless steel stamped ...

　　The seamless steel tubes that are common in our lives are round-tube type. So, do you know what it is used in our lives? 　　When it comes to the use of seamless steel pipes , we are most familiar with the fluid transportation of natural gas, water and other daily life. In addition to these common and well-known natural gas and water transportation, seamless steel pipes are also widely used to transport oil, gas and certain solid materials. Pipeline transportation realized by seamless steel pipes facilitates people's modern life and greatly reduces the transportation cost of natural resources. 　　Secondly, because the seamless steel pipe is hollow, its quality is much lighter than that of the ssaw steel pipe, and it is naturally more economical. Therefore, it plays an important structural part and component in the manufacture of drill pipes and bicycle frames such as automobile transmission shafts and petroleum. Character. At the same time, it also reduces unnecessary waste of r...

　　The steel pipe is divided into two major categories according to the molding method and the manufacturing method. The seamless steel pipe and the welded pipe (the welded pipe is what you call the seamed steel pipe). Seamless steel tubes can be further divided into hot rolled and cold rolled cold drawn tubes. The welded pipe can be further divided into a lsaw steel pipe and a ssaw steel pipe. The seam here does not mean that there are gaps, but the steel pipe has weld marks. After the treatment, the welder is difficult to see. 　　The two are divided according to the processing form. The seamed steel pipe is generally welded. The seamless steel pipe has two methods of cold drawing and hot drawing. The carbon steel pipe is in terms of material, and the galvanized pipe is the surface of the welded pipe after the production. Galvanized treatment. Popular: the conveyor carrier requires high, such as pressure, environment, maintenance, corrosion, temperature, etc. with seamless steel pipe...

　　In recent years, the demand for steel products by automobile and real estate enterprises has been large, which has greatly increased the demand for steel products, which has driven the development of the steel market. The steel pipe industry is one of the important basic industries in the national economy. Due to the continuous improvement of the living standards of our people and the increasingly good overall economic development, China's steel pipe market has developed rapidly. The demand for the Chinese steel pipe market will continue to increase steadily in the future. 　　Precision seamless steel tubes have the following features: 　　1. Light weight, weight is only 1/5 of the square steel. 　　2. Corrosion resistance, acid resistance, alkali resistance, salt resistance, atmospheric corrosion resistance, high temperature resistance, impact resistance, fatigue resistance, no regular maintenance. Their effective service life can reach more than 15 years. 　　3. The tensile st...

　　1. Cold-rolled steel allows partial buckling of the section, so that the bearing capacity of the bar after buckling can be fully utilized; and the hot-rolled steel does not allow local buckling of the section. 　　2. The causes of residual stresses in hot-rolled and cold-rolled steels are different, so the distribution on the cross-section is also very different. The residual stress distribution on the section of the cold-formed thin-walled steel is curved, while the residual stress distribution on the section of the hot-striped steel or welded steel is a film type. 　　3. The free torsional stiffness of hot-rolled steel is higher than that of cold-rolled steel, so the torsional performance of hot-rolled steel is better than that of cold-rolled steel. 　　Cold-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler pipe, high pressure boiler pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, and also includ...

　　Generally, stainless steel seamless pipes are subjected to a pickling passivation process. In order to make the surface texture better and the appearance is more clean and beautiful, there is a key step in the pickling passivation process, which is also very error-prone, that is, chemical degreasing. Steps, once the operation is wrong, the surface of the seamless pipe will not be completely degreased, which will not only affect the appearance but also affect the texture. Therefore, we will focus on the precautions for chemical degreasing: 　　1. Chemical degreasing adopts the foaming method in the tank, the oil removal tank is made of steel plate, and the inner wall is covered with PVC or polyethylene. 　　2. Stop the chemical degreasing treatment with 12~15% nitric acid (by volume). The temperature is 40 °C~60 °C, and the time is 2~4 hours. 　　3. When the stainless steel seamless tube is immersed in the tank, pay attention to the position where it is placed, and leave air in the tu...

　　1. Welded steel pipe for low-pressure fluid transportation (GB/T3092-1993) is also called general welded pipe, commonly known as black pipe. It is a welded steel pipe used for conveying general lower pressure fluids such as water, gas, air, oil and heating steam and other purposes. The thickness of the steel pipe is divided into ordinary steel pipe and thick steel pipe; the pipe end form is divided into non-threaded steel pipe (light pipe) and threaded steel pipe. The specification of the steel pipe is expressed by the nominal diameter (mm), and the nominal diameter is an approximate value of the inner diameter. The welded steel pipe for low-pressure fluid transportation is mainly used as a raw pipe for galvanized welded steel pipe for low-pressure fluid transportation, in addition to being directly used for conveying fluid. 　　2. Galvanized welded steel pipe for low pressure fluid transportation (GB/T3091-1993) is also called galvanized electric welded steel pipe, commonly known a...

　　The raw material of ssaw steel pipe is a hot rolled plate, which is a strip or a coil. 　　Hot-rolled steel sheets, that is, hot-rolled steel-rolled steel sheets or steel strips, commonly known as hot plates, are usually also written as zigzags, such as hot-rolled sheets, but all refer to the same hot-rolled sheet. Refers to a steel plate having a width greater than or equal to 600 mm, a thickness of 0.35-200 mm, and a steel strip having a thickness of 1.2-25 mm. The cold-rolled sheet is obtained by rolling a hot rolled coil as a raw material at a recrystallization temperature at room temperature. 　　The difference between hot rolled sheet and cold rolled sheet: 　　Hot-rolled steel sheets are divided into structural steel, low-carbon steel, and welded steel, and then you can find the steel you need according to various steels, and check the density and composition of specific steels. 　　Hot-rolled steel sheets have low hardness, easy processing and good ductility. 　　The cold ro...

　　The large-diameter ssaw steel pipe factory needs to test the product after the production is completed, especially its compressive capacity, because we usually use it in the ground when it is used, so it is required to have good pressure resistance, then how to test it. 　　Firstly, both ends of the tested steel pipe are sealed by the end seal device and low pressure water is injected. During the water injection process, the air in the pipe is exhausted through the exhaust valve. After the low pressure water is filled, the high pressure water is injected into the pipe through the pressurizing device to pressurize the gas. The specified test pressure is reached. After the specified test pressure is reached, the pressure is maintained for a predetermined period of time. If there is no leakage or deformation, the pressure is released. 　　Products that have been tested for resistance to stress can be used to ensure the effectiveness of the spiral tube. Of course, it is necessary to car...

　　The double-sided submerged arc welded spiral steel pipe produced by the ssaw steel pipe factory shall be subjected to mechanical performance test, flattening test and flare test before leaving the factory, and meet the requirements of the standard. The quality inspection method is as follows: 　　1. Double-sided submerged arc spiral steel pipe is judged from the surface, that is, in appearance inspection. The appearance inspection of welded joints is a simple and widely used inspection method. It is an important part of the inspection of finished products, mainly to find defects and dimensional deviations on the surface of the weld. It is generally inspected by the naked eye and by means of tools such as standard templates, gauges and magnifiers. If there is a defect on the surface of the weld, there is a possibility of defects inside the weld. 　　2. Inspection of the physical method of double-sided submerged spiral spiral steel pipe: The physical inspection method is a method of m...

　　 SSAW steel pipe itself has no life limit, and the service life is mainly related to the operating environment and production process. Spiral steel pipe operating environment is relatively poor In order to extend the service life, the outer wall and inner diameter of the steel pipe are preserved. 　　Anti-corrosion steel pipe refers to a steel pipe that has been treated by anti-corrosion technology and can effectively prevent or slow down the corrosion phenomenon caused by chemical or electrochemical reaction during transportation and use. The anti-corrosion steel pipe can effectively prevent or slow down the corrosion and prolong the service life of the steel pipe and reduce the running cost of the steel pipe. 　　There are many steel pipeline anti-corrosion coatings in China, such as petroleum asphalt, PE jacket and PE foam jacket, epoxy coal tar pitch, coal tar enamel, epoxy powder and three-layer composite structure, and epoxy coal tar pitch cold-wrapped belt (PF type). , rubber...