steel tube

    Large diameter straight seam steel pipe welding, including pre-welding, welding and welding outside the three processes. The so-called pre-welding that is, after the steel pipe forming, the use of continuous high-speed gas shielded welding (MAG) method of forming steel pipe positioning welding. After the pre-welding, respectively, within the steel pipe, multi-wire submerged arc welding. In the case of high-speed gas-shielded pre-welding, there are currently two methods. One is the use of single-wire dual-power high-current high-speed gas protection pre-welding, such as the United States, Germany that is used in this way; the other is double-wire high-speed gas protection pre-welding, Japan is the use of this method. At present, more applications are monofilament high-speed gas protection pre-welding method, in a reasonable welding process conditions, can achieve not less than 7m / min high speed, and straight bead forming beautiful. As the pre-welding of the first step of ...

    There are many factors that affect the quality of large diameter double-sided submerged arc welding steel pipe(dsaw steel pipe). The key factors that directly relate to the quality of diameter forming are the expansion ratio, the amount of axial overlap, the number of segments and the rounded corners, The friction and lubrication between the block and the inner wall of the steel pipe, the shape error of the steel pipe, the expanding speed and the straightening setting of the expanding machine.     (1) When the enlarging rate is small, the roundness error of the steel pipe decreases with the enlarging rate, but when the enlarging rate increases to a certain value, with the enlargement rate increasing, The roundness error of the steel pipe will increase greatly. In the actual production, the expansion ratio is controlled between 0.8% and 1.5%.     (2) The amount of axial overlap has a certain influence on the uniformity of the longitudinal deformation...

    Thick-walled steel pipe, the pipe diameter and wall thickness ratio of less than 20 like that steel pipe known as thick-walled steel pipe. Mainly used for petroleum geological drilling tube, petrochemical cracking tubes, boiler tubes, bearing tubes and automotive, tractors, aviation and other high-precision structural control.     The biggest difference between the thick wall steel pipe and thin-walled steel pipe is the wall thickness, in general, are thin-walled steel pipe belongs to drawing technology, and thick-walled steel generally use hot-rolled technology, if it is measured wall thickness / pipe diameter is equal to 0.05 that is a thick-walled steel pipe and thin-walled pipe watershed, wall thickness / diameter less than 0.05 that is a thin-walled steel pipe, thicker than the steel pipe, in use On, the thin-walled steel pipe used for pipe. The thick-walled steel pipe and more hollow parts used in the blank. Pressure and the use of important pipelines. ...

    Seamless pipeline is mainly used for conveying high-pressure oil and gas near the wellhead. With the increasingly serious problem of hydrogen sulfide corrosion, the development of anti-sulfur seamless pipeline is imminent, and the performance of sulfur-resistant is the key. The influence of Cu and Ni on the HIC properties of the carbon seamless steel pipe materials and the S content in the steel were also investigated. The effects of Cu and Ni addition on the properties of the HIC were also investigated. Hydrogen bubbling sensitivity.     With the deepening of oil and gas exploration, mining conditions are complex and the oil and gas wells in the sulfur environment more and more, hydrogen sulfide corrosion is very acute. In recent years, domestic and international demand for sulfur-resistant seamless pipe line is increasing. Seamless pipeline is mainly used for conveying high-pressure oil and gas near the wellhead, is the use of seamless pipe production method...

    1, The supply of astm a53 seamless steel pipe compared to other traditional pipe, raw materials lighter, high strength, good tolerance, can withstand high internal pressure, the production of sensitive, and can be used to messy or harsh geological conditions.     2, But the steel pipe in the course of the existence of a large rate of end, the main internal and external corrosion treatment trouble. The main external corrosion of the question is very important, the quality of its external anti-corrosion directly affect its service life. Now the main external steel pipe corrosion: concealed type approach, on the steel pipe are requested to strengthen or special enhanced external corrosion, in some areas to promote cathodic protection. On the concealment type of external corrosion method is usually paint, such as petroleum asphalt, epoxy coal tar pitch, which is not easy to cure at low temperatures, and welding construction in the field more questions, originally ...

    Causes of ASTM A53 seamless steel tube crack:     First, the reasons for the tube (round) mostly, the internal contains more cracks, inclusions, air bags and so on. Uneven organization of the tube is the reason, pay attention to the choice of the implementation of tube standard, there is a certain size of the manufacturer of the round bar on the line.     Second, the perforation temperature, process adjustment can not be ignored, if the piercing temperature is low, improper adjustment, can also cause the tearing of the capillary tube internal organization.     Third, the finish annealing temperature is suitable. Perforated heating temperature 1180 ~ 1230 ℃, low, this is the temperature of carbon steel, take 1230-1250 was appropriate. Furnace time is generally more than 60min

    In all steel pipe, ASTM A53 seamless steel tube occupies a large proportion, but the actual production of seamless steel pipe is often used in controlled rolling and cooling technology, easy to control the process of cooling due to uneven cooling plate defects, seriously affecting product quality and contract cash . Plate side wave is one of the more serious one.     Seamless steel tube side of the wave-shaped defects are due to uneven cooling caused by lateral. On-site tracking found that there are obvious on both sides of the side wave plate "band-shaped supercooled" area. The transverse cooling caused by uneven factors are:     1) There are transverse temperature differences between the center and the sides of the seamless tube.     2) seamless steel pipe in the controlled rolling process, the middle and edge there is a large temperature difference.     3) The finish rolling mill adopts "CVC" rolling process, which is cau...

    High frequency straight seam welded pipe typical process: open-book - strip leveling - head and tail shear - strip butt welding - looper storage - forming - welding - clear burr - sizing - testing - flying cut - straight - pipe processing - hydrostatic test - flaw detection - printing and coating - finished product.     Welding speed is one of the main parameters of the welding process, which with the heating system, the weld deformation rate and the crystallization rate of each other.     In the high frequency straight seam welded pipe, welding quality progress along with the speed up of welding speed. This is because the heating time is shortened to narrow the width of the edge heating zone, shortening the time to form the metal oxide, if the welding speed decreases, not only the heating zone is widened, and the melting zone width changes with the input heat change, Burr large. In the low-speed welding, the input heat to make welding less difficul...

    High frequency straight seam welded pipe to control the quality, in order to safely carry out production operations, but also to ensure the operator an essential element of personal safety. The main fields of application include large-span grid project, construction of steel structure project, electric power and EHV transmission and distribution project, mechanical engineering, bridge, bridge, railway station, airport, stadium steel structure project, municipal pipe network, Foundation piling, water gas pipeline and highway construction and other supporting facilities.     1, According to the welding technical specification review wire and flux standards is not accurate, to avoid misuse of welding wire and flux caused by welding quality accident.     2, The welding environment supervision, when the welding environment is not good (temperature below 0 ℃, relative humidity greater than 90%) should be adopted after the appropriate measures for welding....

    The excitation frequency of the high-frequency straight seam welded pipe is inversely proportional to the square root of the capacitance and inductance in the excitation circuit, or to the square root of the voltage and current, and the magnitude of the excitation frequency can be changed by changing the capacitance, inductance or voltage in the circuit. to achieve the purpose of controlling the welding temperature. For mild steel, welding temperature control in 1250 ~ 1460 ℃, to meet the pipe wall thickness of 3 ~ 5mm penetration requirements. In addition, the welding temperature can also be achieved by adjusting the welding speed.     High-frequency induction coil should be close to squeeze roller position. If the induction coil is located farther away from the squeeze roller, the effective heating time is longer, the heat affected zone is wider, and the weld strength is decreased. On the contrary, the edge of the weld is heated insufficiently and the forming...

    Spiral steel pipe in the factory should do before the mechanical performance test and flattening test and flaring test, and to meet the requirements of the standard requirements.     Spiral steel pipe quality testing methods are as follows:     1, From the surface to judge, that is, in the appearance of inspection. The appearance of the welded joint inspection is a simple procedure and a wide range of inspection methods, is an important part of the finished product inspection, mainly to find the weld surface defects and size of the deviation. Generally through the naked eye observation, with the standard model, gauge and magnifying glass and other tools for testing. If there is a defect on the surface of the weld, there may be a defect in the weld.     2, The physical method of inspection: the physical test method is the use of some physical phenomena for testing or testing methods. Materials or parts of the internal defects of the insp...

    ASTM material standards are developed by the American Society for Materials and Testing, ASTM material standards can include the chemical, mechanical, physical and electrical properties of the material. These standards include both a description of test methods to be performed on building materials, and the size and shape that these materials are to take. Building materials like concrete can be required by local law to meet ASTM standards before being used in construction. Among ASTM A53 and ASTM A106 are widely used.     ASME is the standard of the American Society of Mechanical Engineers. ASME material specifications are based on those published by the ASTM, AWS and other recognized national and international standards. ASME standards are legally required when building infrastructure like bridges, power plant piping and boilers. Among ASME b16.5 are widely used.     ASTM is responsible for the development and re-enactment of standards for all type...

    Other countries and ISO stainless steel standards are provided for hot-rolled (forged) steel, in addition to heating pressure processing steel, the general heat treatment delivery (heat treatment requirements need to be specified in the contract). After heat treatment, according to the requirements, to conduct pickling, shot peening or turning peeling and other surface treatment or surface finishing. For cold-rolled or cold-drawn steel, or cold working conditions, or cold processing after heat treatment, pickling or shot blasting, or heat treatment after the formation, grinding, polishing, or further to varying degrees of hardening processing and other state delivery.     ISO and EN, DIN standards, the delivery status of steel should be according to the production and processing methods and surface conditions of several different types of combinations, more scientific and reasonable, conducive to the implementation of standards.     With regard to t...

    We would like to use steel billet dropped by our parents for toys in our childhood. Sara gets know that this kind of product would be used in seamless steel pipe production. Who is this boy? Let’s have a look at it.     Lots of books have discussed the oxidation resistant coatings applied to steel billet at high temperature. Why should the steel billet need the high temperature dealing? This relates to products process which includes the hot pressing pressure, hot pressing temperature and pressing time. These elements are the result of the integrated action of the slab state (wood raw material, adhesive, moisture content, etc.) and hot pressing elements. Under this situation, if the effective descaling is carried out, it is very important to control the feeding speed of steel billet, the flow rate of water and the pressure of water. Thus suppliers would guarantee the high quality seamless steel pipe for clients during the whole production process.   ...

    No doubt that various factors would have effect for the end product of seamless steel pipe when discussed among customers and suppliers. As manufacturers of steel pipe, it is our responsibility to think about this question and produce high quality product for our clients.     First of all, surface hardness of low carbon steel billet made for seamless steel pipe is rather low, when billet is blasted, pit defects will occur on its surface. Thus, this would lead to the lack of defects.     Secondly, equipment used for cutting seamless steel pipe is also necessary for high quality of it. For example, hot-shear blade is the main tool which is used to cut hot rolling steel billet. Its performance directly affects the quality of continuous metal casting billet. And this would give results for seamless steel pipe which made by steel billet.     In addition, the control for the whole production process has played an important role for high qualit...

　　Despite the controversy about climate change, global warming is happening. According to the World Steel Association, the world must decrease its CO2 emissions by at least 12 gigatonnes by 2030 to contain rising temperatures below 2 degrees centigrade. 　　In order to meet this mark, industries need to find sustainable sources of fuel in the near future, or be met with costly penalties. Up to now, the price of non-renewable fuel was too attractive for clean energy to be competitive. However, tighter regulations, major leaps in technology and state-level commitment have birthed a new era of renewable energy. 　　Energy you can bank on 　　According to Bloomberg analysts, USD 10.2 trillion will be spent on new power generation by 2040, 72 percent of which will go towards wind and solar photovoltaic plants. By then, the cost of solar electricity will drop 66 percent, meaning by 2021, solar power will be cheaper than energy from coal in China, India, Mexico and the UK. The cost o...

    Welded pipe unit welding process using open-book, pinch, straightening, shearing, orientation, butt welding, looper, to medium, the process can be described as complex and changeable.     Specific butt welding process is:     1, After the coil is well positioned, the left and right conical heads of the uncoiler can be inserted into the coil and rotate at the same time, the lead is sent to the nip roller, the roller of the nip roller is pressed down, the coil car and the magnet roller can be returned in situ.     2, In order to spring steel can accurately run in center, uncoiler before the operation of the overall axial movement + 150mm. After the uncoiler is started, the strip passes the pinch roller to the leveler equipped with the dedusting unit.     3, The straightening of the spring steel strip with a sliding hydraulic shears of the head and tail of the strip cut (strip head can be immediately slipped into the waste insid...

    Recently we’ve receive an inquiry for the requirement of the details for purchasing of Zinc, galvanized steel pipe for engineering project. Actually, we all know that there are lots of questions we need to notice for the wholesale of the galvanized steel pipe.     First of all, we should figure out that in metallurgical industry, smelting copper, aluminum, lead, zinc, galvanized heating, metal heat treatment furnace are related for the production process. So it is necessary to know that there are three types of galvanized steel pipe which are Pre-painted (zinc: 60-120G/M2); Hot-dipped galvanized (zinc: 120-500G/M2); Cold-dipped galvanized(zinc:10-50G/M2).     What's more, the cerium conversion coating, which was prepared properly, would provide a better protection against corrosion for zinc and galvanized steel than the chromate conversion coating did. We should take the good dealing for the choosing of the coating once we know a better solution for...