steel pipe

　　Duplex stainless steel refers to stainless steel in which the ferrite phase and the austenite phase each account for about half (volume fraction) after solution treatment. In general, the content of less phase is at least 30%. This type of steel combines the characteristics of austenitic and ferritic stainless steels with outstanding mechanical and corrosion resistance properties, and is primarily used in petroleum, chemical, construction, and marine industries. Carbon is one of the most useful and economical elements of advanced alloy strength, but so far there has been less discussion about the arrangement and function of high carbon duplex stainless steel. 　　The researchers applied high temperature carbon duplex stainless steel 20Cr25Ni11Mo3CuWV to solution treatment and aging treatment at different temperatures. Optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometry (XRD) were used. The arrangement was changed...

　　ERW straight seam welded pipe, also known as "resistance welded straight seam welded pipe", ERW straight seam welded pipe is mainly divided into two forms: ERW AC welded steel pipe and ERW DC welded steel pipe. ERW straight seam welded pipes are further divided into low frequency welding, intermediate frequency welding, ultra intermediate frequency welding and high frequency welding according to different frequencies. High-frequency welding is mainly used for the production of thin-walled steel pipes or ordinary thick-walled steel pipes. High-frequency welding is divided into contact welding and induction welding. 　　ERW is a general name for resistance welded steel pipes. Straight seam high-frequency resistance welding (ERW steel pipe), ERW is the first letter corresponding to an English word. Resistance welded steel pipes are divided into AC welded steel pipes and DC welded steel pipes. 　　AC welding is divided into low frequency welding, intermediate frequency welding,...

　　1) 2205 stainless steel tube yield strength is more than double that of ordinary austenitic stainless steel, and has sufficient plastic toughness required for molding. The thickness of the tank or pressure vessel made of duplex stainless steel is 30-50% lower than that of the commonly used austenite, which is beneficial to reduce the cost. 　　2) It has excellent resistance to stress corrosion cracking. Even the duplex alloy with the lowest alloy content has higher resistance to stress corrosion cracking than austenitic stainless steel, especially in the environment containing chloride ions. Stress corrosion is a prominent problem that is difficult to solve in ordinary austenitic stainless steels. 　　3) The most common 2205 duplex stainless steel used in many media has better corrosion resistance than ordinary 316L austenitic stainless steel, while super duplex stainless steel has high corrosion resistance. In some media, such as acetic acid and formic acid. It can even replace hig...

　　1) The site or warehouse where the spiral steel pipe products are kept should be cleaned and drained, away from the factories and mines that generate harmful gases or dust. Weeds and all debris should be removed from the site to keep the steel 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 stacked separately to prevent confusion and prevent 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 bar, medium-diameter steel pipe, steel wire and steel wire rope, etc., can be stored in a well-ventilated shed, but must be covered with a cushion. 　　5) Some small steel, thin steel, steel, silicon steel, small-diameter or thin-walled steel pipes, various cold-rolled and cold-drawn steels, and high-priced, corrosive metal products can be stor...

　　 Pipe fittings include garbage pipes, flues, ventilation ducts, air-conditioning pipes, water supply and drainage pipes, gas pipes, cable pipes, goods conveyance shafts, etc., and are part of the building. 　　Garbage pipe 　　Vertical pipelines for conveying domestic waste in multi-storey and high-rise buildings are mostly installed in the walls of the building's stairwells, corridors, kitchens, service balconies and other concealed walls or in dedicated duct rooms. 　 　Chimney flue 　　Chimney exhaust channel for stoves in buildings. The part of the flue beyond the roof is called the chimney. Various stoves that use coal firewood as fuel, such as stoves in kitchens, water rooms and boiler rooms, need to be provided with flues. 　　 Air duct 　　Ducts in buildings that use natural ventilation for ventilation. Ventilation ducts should be provided to regulate air in toilets, bathrooms, kitchens and other rooms that emit water vapor, oil fume, or harmful gases, rooms with large c...

　　One of the most valuable grades of austenitic stainless steel is AISI 304, and is part of a category of alloys characterized by the presence of a percentage of Nikel between 8% and 14% and chromium between 17% and 19% but also small amounts of molybdenum. 　　The main feature of AISI 304 is its high resistance to corrosion in particular in aggressive environments, it is also used in breeding, poultry or pig farming plants, whose sewage is particularly aggressive. 　　The alloy of AISI 304 is particularly stable chemically and this allows a duration that is unthinkable for other materials, it is therefore used in particular for the construction of pipes in the chemical sector, but also for food. This allows them to be sanitized even with products that could be aggressive in other cases. 　　The only limitation of AISI 304 steel is its low resistance to pitting, ie aggression in a brackish environment, therefore it is not very suitable in marine environments or near the sea.

　　The starting point for the production of carbon steel fittings are welded steel pipes or sheets of the desired thickness which are treated differently depending on the part to be made. 　　HYDROFORMING a process used in particular in the realization of normal or reduced tees, or the forming of the lateral branch of the tube through the action of a liquid under pressure, generally oil 　　DRAWING: a process carried out on sheet metal through the action of a press, usually cold-pressed, which serves to give the fittings greater resistance to yielding 　　FORGING: hot forging is a motion similar to drawing but makes the final product more ductile than a deep-drawn product, usually these two processing techniques are used for open products such as dished ends. 　　HOT DEFORMATION: after having brought the tube to the most suitable temperature for the process, through the shaped punches, the material is deformed to produce details such as normal or wide curved curves. This is one of the ...

　　1. Seamless steel pipe annealing operation method: After heating the seamless steel pipe to Ac3+30~50 degrees or Ac1+30~50 degrees or below Ac1, it is generally cooled slowly with the furnace temperature. 　　Objective: 1. Reduce hardness, improve plasticity, improve cutting and pressure processing performance; 2. Refine grain, improve mechanical properties, prepare for the next step; 3. Eliminate internal stress generated by cold and processing. 　　Application points: 1. Suitable for alloy structural steel, carbon tool steel, alloy tool steel, high-speed steel forgings, welded parts and raw materials with unsatisfactory supply conditions; 2. Generally annealing in the blank state. 　　2. Seamless steel pipe normalizing operation method: The seamless steel pipe is heated to 30 to 50 degrees above Ac3 or Accm, and then cooled to a temperature slightly larger than the annealing cooling rate. 　　Objectives: 1. Reduce hardness, improve plasticity, improve cutting and pressure processin...

　　No matter what type of material is made of the pipe that needs to be maintained, of course, the seamless steel tube also needs to take some maintenance, although the seamless steel tube has a strong resistance to corrosion and wear , but in the encounter with some strong acids or strong alkaline substances they will cause a certain impact. In life it is not difficult to find friends in the rust of seamless steel pipe, so it is very necessary to maintain the seamless steel pipe . 　　Maintenance of seamless steel tubes: 　　Many people know that knowledge of seamless steel tube is greater, but many people only know the production, sales, use, etc. of knowledge of the seamless steel tube, but there is still a part that is very important, it is maintenance and maintenance! 　　Seamless steel pipes in the production of seamless steel pipes will be involved in the process of pickling steel pipes. For the staff, in the pickling of seamless steel tubes when we must pay attention to what the...

　 　Plastic coated pipe 　　Plastic coated pipe is the pipe as the matrix, through a special process in the inner wall of the molten coating or adsorption food grade epoxy powder coating or PE raw material of high temperature curing of the new composite materials. Has excellent corrosion resistance and a relatively small frictional resistance. Epoxy coated steel pipe for drainage, water, warm water, oil, gas and other media delivery, polyvinyl chloride (PVC) plastic pipe for drainage, water, oil, gas and other transmission medium. The coated pipe is the use of PE (modified polyethylene) for hot dip or EP (epoxy) coated products inside and outside, with excellent corrosion resistance. At the same time the coating itself also has good electrical insulation, does not produce electrical erosion. Low water absorption, high mechanical strength, low coefficient of friction, to achieve the purpose of long-term use. Can effectively prevent the plant roots and soil damage and other environmental ...