Precision antibacterial stainless steel pipe is a kind of pipe fitting that has higher quality requirements than conventional pipe fittings. This high-quality requirement is mainly reflected in dimensional accuracy, pipe orifice roundness, pressure resistance, etc. This type of pipe is classified by pipe wall thickness, pipe orifice size, pipe cross-sectional shape and material, and the type of pipe directly affects use. 1. Pipe wall thickness According to the wall thickness, it can be divided into thin-walled pipes and thick-walled pipes. The ratio of wall thickness to outer diameter of thin-walled pipes is less than 6%. The thinner the pipe wall, the better the heat dissipation performance. It can generally be used as a heat exchange pipe. The inner pipe wall It is required to be smooth and not easy to scale; suitable for central air conditioners, boilers, refrigerators, etc. The ratio of wall thickness to outer diameter of thick-walled stainless steel pipes is greater than or equal to 6%, and the welds must be completely penetrated. They have good pressure resistance, mechanical properties, abrasion resistance, etc., and can be used for textile equipment, electroplating Equipment, parts and components of dyeing equipment. 2. Nozzle size According to the size of...
Stainless steel – spring steel 301L-LT Mechanical properties: The suitable cold working method has low strength, good flatness and large elongation after rolling. Applicable welding methods: arc welding heating has no effect on its mechanical properties, so both spot welding and arc welding can be applied. Applicable cold processing methods: stamping, stretch bending and bending processing of parts with low strength requirements 301L-DLT Mechanical properties: low strength, secondary rolling rate is controlled within the range of 3% to 8%, small residual stress, small creep at room temperature, and good surface flatness can be maintained. Applicable welding methods: Arc welding heating does not have much impact on its mechanical properties, so spot welding and arc welding are both acceptable. Cold working methods used: bending and drawing of parts with lower strength, especially those that do not use a flattening machine for rolling. 301L-ST Mechanical properties: Moderate strength, secondary rolling rate is controlled within the range of 6% ~ 12%, and the surface flatness after rolling is good. Applicable welding methods: The strength of the material does not decrease significantly after heating, so spot welding is the main method, and electromagnetic welding can be used. Applicable cold working methods: Suitable for stretch...
01 The purpose of the stainless steel bright annealing process Bright annealing furnace is mainly used for heat treatment of finished stainless steel products under protective atmosphere. When the performance requirements are different, the requirements for the metallographic structure after bright annealing are different, and the bright heat treatment process is also different. The typical heat treatment process for 300 series austenitic stainless steel is solution treatment. During the heating process, the carbides are dissolved into the austenite, heated to 1050~1150°C, and kept for a short period of time to allow all the carbides to dissolve in the austenite, and then rapidly cooled to below 350°C to obtain a supersaturated solid solution that is uniform. Unidirectional austenite structure. The key to this heat treatment process is rapid cooling, which requires the cooling rate to reach 55°C/s and quickly pass through the re-precipitation temperature zone (550~850°C) after carbide solid solution. The holding time should be as short as possible, otherwise the grains will become coarse and affect the surface finish. The heating temperature of 400 series ferritic stainless steel is relatively low (around 900°C), and slow cooling is often used to obtain an annealed and softened structure. Martensitic stainless steel is...
After years of research and development, stainless steel has many classifications. Among them, according to the different matrix structures of stainless steel materials, they are mainly divided into: 1. Ferritic stainless steel Ferritic stainless steel is the most common type of stainless steel material. It is a stainless steel with a mainly ferrite structure under use. The chromium content of this stainless steel is between 11% and 30%. In addition, it also contains small amounts of molybdenum, titanium, niobium and other elements. In addition to its good corrosion resistance, ferritic stainless steel is characterized by good oxidation resistance and excellent stress resistance. It also has good thermal conductivity and a very small expansion coefficient. However, ferritic stainless steel has poor plasticity, so this stainless steel material is mainly used to make corrosion-resistant parts. 2. Austenitic stainless steel Austenitic stainless steel is a stainless steel material with a stable austenitic structure inside. In addition to containing 18% chromium and about 8% nickel, it also contains a small amount of molybdenum, titanium, nitrogen and other elements. This kind of stainless steel material is a product with good comprehensive performance and can withstand corrosion from various media. Moreover, austenitic stainless steel has relatively...
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