what are 304 and 316?
Both 304 and 316 are Austenitic stainless steel, the difference is that 316 has 2% molybdenum added. In this way, the corrosion resistance of 316, especially the corrosion resistance of chloride ions, is better than that of 304. The price is about 20% more expensive.304, 316, etc. are the names of American steel grades. 304 corresponds to the domestic grade 0Cr18Ni9. It is universal stainless steel and the most commonly used stainless steel. It is widely used to make equipment and parts that require good comprehensive performance (corrosion resistance and formability), such as food equipment, general chemical industry Equipment, etc. 304 have an excellent cold and hot processing and molding properties. It can process and produce various products such as plates, tubes, wires, belts, and shapes, and is suitable for manufacturing cold heading, deep drawing, and deep drawing forming parts. The weldability is general, and the usual welding method can be used. No heat treatment is required before and after welding. However, 304 steel also has performance shortcomings: large cross-section steel parts are sensitive to intergranular corrosion after welding; very sensitive to stress corrosion in CL-water (including wet atmosphere); mechanical strength is low, and cutting performance is poor Wait. The 304F represents the sulfur content, which is about twice higher than that of 304, about 0.1. It is better processed in terms of processing. Secondly, the anti-rust performance is slightly lacking compared with 304! 304L corresponds to the domestic brand 00Cr18Ni11, which is a variant of 304 stainless steel with lower carbon content and is used where welding is required. The lower carbon content minimizes the precipitation of carbides in the heat-affected zone near the weld, and the precipitation of carbides may cause stainless steel to produce intergranular corrosion (welding erosion) in certain environments. 316 corresponds to the domestic grade 0Cr17Ni12Mo2. It is low-carbon stainless steel. Its welding performance is better than that of 304. Because stainless steel contains molybdenum, its pitting corrosion resistance in marine and chemical industrial environments is much better than that of 304 stainless steel. Under high-temperature conditions, when the concentration of sulfuric acid is lower than 15% and higher than 85%, 316 stainless steel has a wide range of uses. 316 stainless steel also has good chloride corrosion properties. Among them, the 316 stainless steel variants include low-carbon stainless steel 316L, nitrogen-containing high-strength stainless steel 316N, and free-cutting stainless steel 316F with a higher amount of sulfur.316L is an ultra-low carbon stainless steel with a maximum carbon content of 0.03. It can be used in applications that cannot be annealed after welding and require maximum corrosion resistance. Its corrosion resistance is better than 304 stainless steel, and it has good resistance in the production process of pulp and paper. Corrosion performance.316 and 316L have better heat resistance and can be used as heat-resistant steel, but 304 cannot. In intermittent use below 1600 degrees and continuous use below 1700 degrees, 316 stainless steel has good oxidation resistance.it is best not to work continuously In the range of 800-1575 degrees, but when 316 stainless steel is used continuously outside this temperature range, the stainless steel has good heat resistance. 316L stainless steel has better resistance to carbide precipitation than 316 stainless steel, and the above-mentioned temperature range can be used.
Stainless steel pipe is a hollow long round steel, which is widely used in petroleum, chemical, medical, food, light industry, machinery and instrumentation and other industrial pipelines and mechanical structural parts. In addition, when the bending and torsion strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also often used as furniture and kitchen utensils.
HHGG Thick Wall Stainless Steel Pipe
Seamless Stainless Steel PipeApplication prospects of stainless steel pipesStainless steel pipe is a kind of economical cross-section steel. It is an important product in the iron and steel industry. It can be widely used in life decoration and industry. Many people on the market use it to make stair railings, window guards, railings, furniture, etc. There are two common materials, 201 and 304.It accounts for about 8% to 16% of the total amount of steel, and it has a wide range of applications in the national economy. Because the steel pipe has a hollow section, it is most suitable as a pipeline for liquid, gas and solid transportation. At the same time, compared with round steel of the same weight, the steel pipe has a large section coefficient and high bending and torsion strength, so it has become a variety of machinery and building structures. Important material on the site. Structures and parts made of stainless steel tubes have a larger section modulus than solid parts under the same weight. Therefore, stainless steel pipe itself is a kind of economical section steel that saves metal. It is an important part of high-efficiency steel, especially in oil drilling, smelting and transportation industries. The second is geological drilling, chemical industry, construction industry, machinery Industry, aircraft and automobile manufacturing, as well as boiler, medical equipment, furniture and bicycle manufacturing also require large amounts of various steel pipes. With the development of new technologies such as atomic energy, rockets, missiles, and aerospace industries, stainless steel pipes have become more and more important in the defense industry, science and technology, and economic construction.Stainless steel pipes are safe, reliable, hygienic, environmentally friendly, economical and applicable. The thin-walled pipes and the successful development of new reliable, simple and convenient connection methods make it have more irreplaceable advantages for other pipes, and more and more applications in engineering , Use will become more and more popular, and the prospects are promising.As stainless steel has many ideal properties required by building materials, it can be said to be unique among metals, and its development continues. In order to make stainless steel perform better in traditional applications, the existing types have been improved, and in order to meet the strict requirements of advanced construction applications, new stainless steels are being developed. Due to continuous improvement in production efficiency and continuous improvement in quality, stainless steel has become one of the most cost-effective materials chosen by architects.Stainless steel combines performance, appearance and use characteristics, so stainless steel will still be one of the best building materials in the world.Application need of stainless steel pipeAuto industryStainless steel is mainly used in the exhaust system, which accounts for more than 1/2 of the total amount of automotive stainless steel, and 80% is ferritic stainless steel. The exhaust gas generated by the automobile engine finally flows out of the muffler through the exhaust gas intake pipe, front pipe, hose, converter, and center pipe. Commonly used steel grades for exhaust systems are 409L, 436L, etc. Automobile mufflers mainly use stainless steel welded pipes. According to calculations, stainless steel pipes used in automobiles account for about 1.5% of the entire downstream consumption of stainless steel pipes, and the use ratio of stainless steel seamless pipes and welded pipes is about 2:1.The petrochemical industry includes the fertilizer industryThere is a huge demand for stainless steel pipes. The industry mainly uses stainless steel seamless pipes. The specifications include: 304, 321, 316, 316L, 347, 317L, etc. The outer diameter is about ￠18-￠610, and the wall thickness is 6mm-50mm Around (usually select medium and low pressure conveying pipes with specifications above Φ159mm), the specific application areas are: furnace pipes, material conveying pipes, heat exchanger pipes, etc.Transportation of fluids such as water and gasStainless steel pipes and their water delivery equipment are the most advanced basic water purification materials in the world today. They have strong anti-corrosion performance. Cast iron pipes, carbon steel pipes, plastic pipes, etc. cannot be compared with them.The best choice for water industry such as water preparation, storage, transportation, purification, regeneration, and desalination. The annual demand is about 25,000 tons.Equipment manufacturing and maintenanceThe annual consumption of stainless steel pipe is more than 20,000 tons. This type of industry mainly uses sanitary or antibacterial grade stainless steel pipes. The sanitary seamless pipe made of imported SUS304 and 316L can meet the special requirements of various media in the food and biopharmaceutical fields. Antibacterial stainless steel has the advantages of stainless steel and good antibacterial performance. The demand for kitchen equipment, workbenches and utensils in the food industry, medical equipment, tableware and towel holders in daily life, and brackets for refrigerated cabinets is increasing.
The wall thickness is uniform and accurate, and the outer diameter is perfectly accurate. It can be customized according to the length and size of the customer requiement or the spot zero cutting. Actually any length can be zero cutting.
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