SSAW Pipe

　　The most regular NDT methods are as follows: 　　Penetrant Testing:4xac 　　Penetrant solution is applied to pipe fittings or flanges cleaned surfaces.The liquid is pulled into cracks or defects by capillary action.Excess penetrant material is carefully cleaned from the surface.A developer is applied to pull the trapped penetrant material back to the surface where it is spread out and shows an indication.This indication is much easier to find than the crack or defect. 　　Magnetic Particle Testing 　　A magnetic field is established in a pipe fitting made from ferromagnetic material.The magnetic lines of force travel through,exit and reenter the material at the poles.Defects such as crack or voids cannot support as much flux,and force some of the flux outside of the part.Magnetic particles distributed over this pipe fitting will be attracted to areas of flux leakage and shows a visible indication. 　　Ultrasonic Testing 　　When the quality checker use a transducer to send the high f...

　　Cold rolling of stainless steel engineering pipe refers to cold-drawing, cold-bending, cold-drawing and other cold processing of steel strips into stainless steel pipes at room temperature. Advantages: fast forming speed, high output, and without damaging the coating of stainless steel pipes, can be made into a variety of cross-section open forms to meet the needs of the use conditions; cold rolling can cause large plastic deformation of stainless steel pipes, thereby improving The yield point of the stainless steel tube. 　　Disadvantages of cold-rolling stainless steel engineering tubes: Although there is no thermal plastic compression during the forming process, residual stress still exists in the section, which will affect the overall and local buckling characteristics of stainless steel tubes. 　　Advantages of stainless steel engineering pipe hot rolling: It can destroy the casting structure of steel ingots, refine the grains of steel, and remove the defects of microstructure,...

　　As a consumer, what is more intuitive to see is the surface brightness of stainless steel pipes . The stainless steel decorative pipe is made of 2B stainless steel coil before molding. The surface of the stainless steel welded pipe after molding is smooth. It is also commonly known in the industry as a matte surface. This surface is smooth and shiny, showing the original color of the metal. After processing by the polishing equipment (180 ～ 600 # polishing wheel), the matte surface (round sand / straight wire) can be obtained, also known as matte surface, bright surface and highlight and mirror surface effect. 　　Under normal circumstances, the mirror effect of stainless steel tubes is only a sign of high brightness. Only the grinding and polishing of stainless steel plates can achieve a true mirror surface. The surface treatment industry of stainless steel decorative tube is generally divided into two types: wire drawing and bright surface, which is also currently suitable for the ...

　　The so-called difference between stainless steel seamless steel tube and carbon steel seamless steel tube mainly refers to the difference in design rules between stainless steel and carbon steel , that is to say, the design rules of these two types of steel are not universal. These differences are summarized as follows: 　　The design rules of stainless steel cannot be applied to carbon steel because there are 3 fundamental differences between stainless steel and carbon steel: 　　First, stainless steel undergoes work hardening during cold working, for example, it has anisotropy when bending, that is, the lateral and longitudinal properties are different. 　　The strength increased by cold working can be used, but if the bending area is smaller than the total area and the increase is ignored, the increase in strength can improve the safety factor to a certain extent. 　　Second, the shape of the stress / strain curve is different. The elastic limit of stainless steel is about 50% of ...

　　The role of nitrogen in stainless steel 　　1.Effect on the stainless steel matrix structure 　　The effect of nitrogen on stainless steel is very strong. Nitrogen in the stainless steel matrix can replace some nickel elements, reduce the ferrite content in stainless steel, help stabilize austenite, reduce the precipitation of harmful intermetallic phases, and even avoid martensite transformation during cold working. 　　2.Effects on the mechanical properties of stainless steel 　　The effect of nitrogen in stainless steel on the mechanical properties of the matrix is mainly reflected in two aspects. First of all, nitrogen can obviously improve the strength of stainless steel without reducing the plastic toughness of stainless steel. This is a good direction to study the high strength and toughness of stainless steel. Secondly, the nitrogen element can also enhance the creep resistance, fatigue resistance and wear resistance of stainless steel. 　　3.Effect on the corrosion resistanc...

　　Heat exchanger is transfering the part of the heat of the hot fluid to cold fluid device, also known as heat exchangers. The heat exchanger is general equipment of the chemical, petroleum, power, food and many other general equipment and plays an important role in production. Heat exchangers in chemical production can be used as a heater, cooler, condenser, evaporator and reboiler, etc., applied more widely. Many types of heat exchangers, but basically cold and hot fluid heat exchange principles and methods can be divided into three categories namely: partitions, hybrid and regenerative. In the three types of heat exchangers, the Partitions heat exchanger applications. 　　The role of the heat exchanger cold refrigerant will be sent to the pipeline of fresh air in the heat exchanger for heat exchange of fresh hot air into the pipe into the required low temperature. The boiler is heating, indoor winter need heating should be used. 　　The heat exchange tube means including low and med...

　　GENERAL PROPERTIES 　　Alloy 304L a T-300 series stainless steel austenitic, which has a minimum of 18% chromium and 8% nickel. Type 304L has a carbon maximum is 0.030. It is the standard “18/8 stainless” that is commonly found in pans and cooking tools. Alloys 304L is the most versatile and widely used alloy in the stainless steel family. Ideal for a wide variety of home and commercial applications, Alloys 304L exhibits excellent corrosion resistance and has a high ease of fabrication, outstanding formability. The austenitic stainless steels are also considered to be the most weldable of the high-alloy steels and can be welded by all fusion and resistance welding processes. 　　Specifications: UNS S30403 　　Application of Alloy steel pipe 　　Alloy 304L Stainless Steel pipe is used in a wide variety of home and commercial applications, including: 　　Food processing equipment, particularly in beer brewing, milk processing, and wine making 　　Kitchen benches, sinks, troughs, equipm...

　　DSAW steel pipe - When it comes DSAW steel pipe and tube distributors, you will find many companies will be able to buy and sell various wall thicknesses and grades. DSAW to some pipe buyers also stands for a “Straight Seam” pipe product, with the weld being visible on the outside as well as the inside. 　　Most DSAW pipe manufacturing companies and distributors carry in stock and have product available to them through mill contacts DSAW carbon steel pipe in sizes ranging from 18.00” O.D through to 60.00” O.D in New, Surplus, Mill Reject and Used Steel Pipe Products. 　　DSAW is available in different grades depending on your application, such as, many ASTM grades and API grades. Our lengths can range from cut to length in 2 ft pieces up to 60 ft lengths. There is the availability of longer lengths in some states but not all due to transportation. End conditions are beveled, straight cut or saw cut, and torch cut. Various paint and protective coatings are available such as, Fusion B...

　 　Mild Steel 　　Mild steel is the type of carbon steel where it contains very low amounts of carbon. Approximately, it is 0.16–0.29% by weight. This steel is very cheap and most commonly used. It is malleable and ductile but has low tensile strength. Mild carbon cannot be hardened by heat treatment. 　 　Carbon steel 　　Carbon steel is used to denote steel with carbon as the main alloying element. In carbon steel, the properties are mainly defined by the amount of carbon it has. For this alloy, the amounts of other alloying elements like chromium, manganese, cobalt, tungsten are not defined. There are four types of carbon steel. This categorization is based on the carbon content. Mild and low carbon steels contain very low carbon percentages. There are three other types of carbon steel as medium carbon steel, high carbon steel and ultra high carbon steel. In the higher carbon steels, the carbon level varies between 0.30–1.70 % by weight. Medium carbon steel has 0.30–0.59% carbon co...

　　The corrosion problem of downhole oil casing pipe in China's offshore oil and gas fields is extremely serious, which seriously affects the service life of downhole oil casing and normal production of oil and gas fields. Through cement sealing, corrosion-resistant alloy pipes, injection of corrosion inhibitors, use of anti-corrosion coating pipes, and enhanced monitoring, the oil casing can be anticorrosive and the normal production of offshore oil and gas fields can be guaranteed. 　　1. Cement sealing and anticorrosion technology 　　In the earliest period, it was analyzed that the main cause of casing damage was due to insufficient cement return, which caused the external water layer to not be completely sealed, which caused corrosive gases in the water layer to erode the casing surface and cause corrosion. Therefore, in the 1980s, a strategy of increasing the cement return height was proposed to increase the corrosion resistance of the casing. Through this technology, the degr...