Corrosion resistance of 304 stainless steel pipe: Average corrosion: 304 stainless steel pipe because of chromium content (22%), molybdenum (3%) and nitrogen content (0.18%), the corrosion resistance of 2205 is better than 316L and 317L in most environments. Local corrosion resistance of 316 stainless steel: The content of chromium, molybdenum and nitrogen in 304 stainless steel makes it have strong resistance to point erosion and crevice erosion in oxidizing and acidic solutions. Stress erosion resistance: The dual-phase microstructure of 304 stainless steel tube helps to improve the stress erosion cracking resistance of stainless steel. In the presence of certain temperature, stress, oxygen and chloride, austenitic stainless steel will undergo chloride stress intrusion. Because these conditions are not easy to control, the use of 304L, 316L and 317L is limited in this regard. Anti-erosion fatigue: The high strength and corrosion resistance of 304 stainless steel make it have a high resistance to erosion and fatigue. Processing equipment is susceptible to aggressive environments and loading cycles, and the properties of 2205 are ideal for such applications. Annealing atmosphere. 316 welded pipes generally use pure hydrogen as the annealing atmosphere, and the purity of the atmosphere is preferably more than 99.99%. If another...
According to the concept, steel has the following material classifications. Production method, chemical composition, there are different material classifications. 1 The concept of steel: Steel is a steel ingot, billet, or steel that is press-worked into the various shapes, sizes, and properties I need. With a wide range of applications and varieties, steel is an essential and important material for national construction and the realization of the four modernizations. According to the different section shapes, steel is generally divided into four categories: profiles, plates, pipes and metal products. Section steel, small section steel, steel cold-formed section steel, high-quality section steel, wire rod, medium and thick steel plate, thin steel plate, electrical silicon steel sheet, strip steel, seamless steel pipe steel, welded steel pipe, metal products and other varieties. 2 Production methods of steel Plastic deformation of the processed steel (bill, ingot, etc.). According to the processing temperature of the steel, it can be divided into two types: cold working and hot working. The main processing methods of steel are: most of the processing of steel is processed by pressure. A press working method with increased length, rolling: passing a steel metal blank through a gap (various shapes) of a pair...
The use of stainless steel plate is very extensive. With the use of stainless steel plate materials in construction and other industries, stainless steel plate smelting enterprises have begun to appear in many places. So how to smelt stainless steel plate, here are the non-oxidation method, oxidation method and return oxygen blowing method; three methods to smelt stainless steel plate. Nowadays, most of the methods we use are the return oxygen blowing method. This method uses scrap steel for direct smelting, which is not only low-cost but also highly efficient. At present, some developed countries in foreign countries also use returned materials in smelting stainless steel. Oxygen blowing method; the stainless steel used in this method occupies a large amount of raw materials, so if there is no stainless steel scrap resource, it will become a meal without rice. In response to this problem, some people have developed a one-step method for smelting stainless steel plates and pipes. This one-step method is one-step smelting of stainless steel in an electric furnace. Because the one-step method has very strict requirements on raw materials, the raw materials and energy media in production are consumed at high costs. high, and the smelting cycle...
When brown spots appear on the surface of the stainless steel coil, people are surprised that the stainless steel coil will not rust, and the rust is not the stainless steel coil, it may be a problem with the steel. In fact, this is a one-sided misconception about the lack of understanding of stainless steel coils. Stainless steel coils will also rust under certain conditions. Stainless steel coils have the ability to resist atmospheric oxidation, that is, non-rust, and also have the ability to resist corrosion in media containing acid, alkali, and salt, that is, corrosion resistance. However, the size of its corrosion resistance is changed with the chemical composition of the steel itself, the conditions of mutual use and the type of environmental media. For example, 304 has absolutely excellent corrosion resistance in a dry and clean atmosphere, but if it is moved to a seaside area, it will soon rust in the sea fog containing a lot of salt, while 316316l stainless steel coil is good performance. Therefore, it is not any kind of stainless steel coil that can resist corrosion and rust at any time. The stainless steel coil is a very thin, firm and fine stable...
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