steel tube

 Austenitic weld inspection within the oil and gas industry is one of the most important assets for professionals in this field. But the inspection process can be daunting without the right equipment. Austenitic alloys and stainless steel resist corrosion more than other materials but are not impervious to corrosive degradation. Therefore, NDT inspectors must implement the same rigorous NDT standards on austenitic alloys and stainless steel as any other item. The best way to test stainless steel and austenitic alloys is via PAUT using 2D matrix array probes. Stainless steel materials carry anisotropic coarse-grain content, with each grain causing reflections and high noise levels. The high noise levels result in greater feedback issues during conventional testing processes versus PAUT. Also, NDT specialists must deal with unintended variations within the structure of the pipeline, making testing difficult. When inspecting an austenitic weld, for example, NDT operators can use the 2...

 1. The size of the casting cannot be too large: investment casting is most suitable for casting medium and small castings with a few shells to more than ten kilograms. In recent years, although the research and production of large-scale precision castings have made great progress, after all, there is a limit, and the size and weight can not be almost unlimited like sand casting. 2. The process is complicated: There are many investment casting procedures, the process is complicated, the production cycle is long, there are many factors affecting the quality of the bag ring castings, and the requirements for the material and process are relatively strict in production. 3. Slow cooling rate of the casting: The solidification and cooling rate of the investment casting is slow, and the crystal structure is coarse. Except for special products such as directional solidified columnar crystals and single crystal mussels, the mechanical properties of general alloy castings are lower than tho...

    1. Meet health requirements     The thin-walled stainless steel water pipe will not cause secondary pollution to the water quality and meet the requirements of national direct drinking water quality standards.     2. Can be 100% recycled     Thin wall stainless steel water pipe is a kind of water pipe that can be completely recycled. It does not leave people with unmanageable trash.     3. Save water     The strength of thin-walled stainless steel water pipe material is higher than that of all water pipe materials, which greatly reduces the possibility of water pipes leaking due to external forces and saves a lot of water resources.     4. Reduce transportation costs     The thin-walled stainless steel water pipe has excellent corrosion resistance, and will not scale during long-term use. The inner wall is smooth and clean, the energy consumption for transportation is low, and the cost is s...

　　In recent years, zinc steel guardrails have been mentioned more and more times, and everyone has accepted this simple way of assembling guardrails. But when many people think of guardrails, most of the materials that they can think of are stainless steel materials, so who has the advantage compared with the two? 　　First: In terms of appearance, stainless steel is monotonous, and zinc steel guardrails can be sprayed with various colors that customers like. 　　Second: In terms of shape, stainless steel and iron art are both welded connections, and installation of magma solder joints is easy to break.Zinc steel is made by phosphating treatment and then spray-painted. It uses punching type, connection accessories and screw connections throughout the process. When installing, you only need to cut the material according to the size and connect the accessories. 　　Third: In terms of service life, iron art generally falls off in 3-5 years. Zinc steel is usually treated for about 10 year...

　　Ferritic stainless steel refers to the stainless steel with 10.5% ~ 30% Chromium content and without Nickel. The main grades including 405, 409, 410, 430, 434,439, 441, 445, 446, 447, of which the most widely used are 409, 410, 430 series. Ferritic stainless steels contain more chromium than Austenitic stainless steels, are less costly and can be used as an alternative material to the 304 or 200 series stainless steels sometimes. According to the chromium content, it can be divided into three groups: Cr10% ~ 15%, Cr16% ~ 20% and Cr21% ~ 30%. 　 　10% -14% Cr: 409、410L 　　409, 410 have the lowest chromium content and the cheapest in all of Ferritic stainless steels, suitable for environments where no corrosion or slight corrosion and local slight rust are allowed. Type 409 was originally designed specifically for automotive exhaust mufflers. 410L stainless steel low carbon content, welding parts of the bending performance, processing performance, good resistance to high temperature ...

　　The combination of chromium and nickel forms chromium-nickel stainless steel, which is a better stainless steel. A large amount of nickel is added to such a stainless steel in order to obtain a single austenite structure, thereby improving its corrosion resistance and workability. It has strong plasticity and toughness at normal temperature and low temperature, is not magnetic, and has good resistance to intergranular corrosion. 　　(1) Chromium plays a major role in the corrosion resistance of stainless steel. Chromium is the main element determining the corrosion resistance of stainless steel. Because chromium in steel can make the stainless steel passivate in the oxidizing medium, that is, a thin layer is formed on the surface. The film is enriched in chromium in this film. The higher the chromium content in the steel, the stronger the corrosion resistance. In addition, chromium can enhance the mechanical properties and process properties of steel. 　　(2) The effect of nickel on...

　　 Production methods 　　Stainless steel tube according to the production method is divided into two categories of stainless seamless pipe and stainless welded pipe , stainless seamless steel pipe can be divided into hot-rolled tube, cold-rolled tube, cold-drawn tube and extrusion pipe, cold drawing, cold rolling is the second Processing; welded pipe is divided into straight seam welded pipe and spiral welded pipe. 　　Section shape 　　Stainless steel tube by cross-sectional shape can be divided into tube and shaped tube. Shaped tube with rectangular tube, diamond-shaped tube, oval tube, hexagonal tube, all directions and a variety of cross-section asymmetric tube. The profiled tube is widely used in various structural parts, tools and mechanical parts. Compared with the tube, shaped tube generally have a larger moment of inertia and cross-section modulus, a greater bending, torsion ability, can be large greatly reduce the weight of the structure, saving steel. 　 　Tube end shape ...

　　No matter seamless steel pipe or welded pipeline, we should have check methods for the final products in order to guarantee the quality. Here are three main points for the tube’s inspection process. 　　There is no cracks, lack of fusion, porosity, slag and spatter for the welded joint’s surface. As these drawbacks would finally have big influence for the good quality of a steel tube. Pipeline design temperature is below -29 degrees, fan ruler of hardened stainless steel and alloy steel pipes tend to be larger weld surface, without undercut. 　　Nondestructive test is necessary on the pipe’s surface. Different steel pipe with various functions should take different pressure taking. Thus, magnetic iron pipe should be used in magnetic particle testing; non-ferromagnetic steel should be used in penetration testing. 　　Ray inspection and ultrasonic testing. Ray inspection and ultrasonic testing is the main target of the butt joint pressure pipe and pipe fittings for butt joints. 　　 ht...

    Steel tube is used in a variety of structural and industrial applications, such as automobile transport, architecture, and construction. These steel tubes are made of different steel structures, from stainless steel, carbon, zinc or soft steel, depending on the application requirements.     Steel tubing is divided into two classes: mechanical and structural, depending on its design. So what is the difference between mechanical and structural steel tube? Below are some points to consider while differentiating the two types of steel tubing. The comparison is made on the basis of application, specification, and shape.     Comparison between mechanical and structural steel tube     Application: Mechanical tubing is used in low stress and light gauge structural applications. These applications include conveyor belt components, solar panel supports, greenhouse structures, kitchens and restaurants, hospitals and medical equipment, and various t...