300 Series: chromium - nickel austenitic stainless steel 301: scalability, for molding products. It can also be rapidly hardened by mechanical processing. Good weldability. Abrasion resistance and fatigue strength than 304 stainless steel. 302: 304 with corrosion resistance, due to relatively high carbon intensity and therefore better. 303: by adding a small amount of sulfur and phosphorus to more than 304 cutting. 304: is a versatile stainless steel, it is widely used to produce good overall performance requirements (corrosion resistance and formability) of equipment and parts. 304 stainless steel is a grade produced in accordance with the ASTM standard stainless steel. 304 equivalent to China's 0Cr19Ni9 (0Cr18Ni9) stainless steel. 304 19% chromium, 9% nickel. 304 is the most widely used stainless steel, heat-resistant steel. For food production equipment, past through chemical equipment, nuclear energy. Shell and tube heat exchanger shell and tube shell and tube heat exchanger diagram (also known as tube type) heat exchanger shell and tube heat exchangers are mainly housing, bundle, consisting of tube plate and seal top portion of the housing mostly round, with internal parallel tubes or spiral, fixed at both ends of the tube bundle plate. Carried out in the heat exchanger shell and tube heat exchanger of the two fluids, a flow in the pipe, which is called the tube stroke; A tube flow tubes offer car muffler blurted, his trip called shell. The wall is the heat transfer surface bundle. Tube models vary, the process is generally 16mm 20mm or 25mm diameter three models, the wall thickness of 1mm, 1.5mm, 2mm and 2.5mm. Import heat exchanger, you can go to the 8mm diameter lowest car muffler blurted tube pictures, wall thickness of only 0.6mm. Greatly improving the efficiency of heat transfer tubes blurted car muffler, 2012 to gradually promote the domestic market is also open. Shell and tube heat exchangers, spiral tubes designed to maximize the effect of increased turbulence, increase heat transfer efficiency. Asymmetrical design of the internal shell and tube layer can be up to 4.6 times. This asymmetrical design, determine its vapor - widely used in the field of water heat exchanger. The maximum heat transfer efficiency can reach 14000w / m2.k, greatly improving production efficiency and cost savings. Also, because the shell and tube heat exchangers are mostly metal structure blurted car muffler pipe prices, along with the introduction of new 高标准 China, stainless steel 316L as the main heat exchanger, will become the beverage, food, and pharmaceutical industries Required.