Good translation Metal Products (Shanghai) offers stainless steel (made of stainless steel / stainless steel imports) 0cr18ni9 stainless steel / 0cr18ni9 steel / 0cr18ni9 steel bar / 0cr18ni9 Coil / 0cr18ni9 steel / 0cr18ni9 pipe / 0cr18ni9 wire (good translation Metal Products (Shanghai) Co., Ltd. ) 
 Outline 
 0Cr18Ni9 as the most widely used stainless steel heat-resistant steel, used in food equipment, general chemical equipment, atomic energy use of industrial equipment. Popular talk 0Cr18Ni9 is 304 stainless steel, 0Cr18Ni9Ti is 321, one national standard, one is American Standard. 321 is bad because the original smelting technology can not only reduce the carbon content development, and now because of improved smelting technology, ultra-low carbon steel smelting is very common, so the 321 has been out of the trend. The current output of 321 has been very small. Only some of the military are still using. 0Cr18Ni9 steel (AISI304) is an austenitic stainless steel, is the initial invention of the 18-8 austenitic stainless steel based on the evolution of the steel, the steel is stainless steel body, with its output accounting for stainless steel production music more than 30%. Because of this austenitic steel with a structure, it can not be strengthened by means of heat, cold deformation can only be used to improve the strength of purpose. Austenitic steel structure gives it a good cold and hot processing performance, non-magnetic and good low temperature performance. 0Cr18Ni9 steel welded thin-section size has sufficient resistance to intergranular corrosion in oxidizing acid (HNO3) has excellent corrosion resistance in alkaline solution and most organic acids and inorganic acids as well as air, water, steam in corrosion resistance is also good. 0Cr18Ni9 good performance of steel, making it the largest application, the most widely used grades of stainless steel, this deep-drawing steel suitable for manufacturing components and forming corrosion medium transmission pipeline, container, structural parts, 0Cr18Ni9 can also be made with non-magnetic sub- , cryogenic equipment and components. 0Cr19Ni10 (AISI304L) is based on the 0Cr18Ni9, slightly increased by reducing the carbon and nickel content of low carbon austenitic stainless steel. This steel is to address the Cr23C6 precipitation resulting in a number of conditions 0Cr18Ni9 steel there is a serious tendency to intergranular corrosion and development. In the early days, due to lower carbon metallurgical production more difficult, once it has hampered the wide application in the 1970s, a new secondary AOD and VOD refining method successfully used in the production process, this really has been widely used steel . And 0Cr18Ni9 comparison, this steel strength lower, but the sensitized state of resistance to intergranular corrosion was significantly better than 0Cr18Ni9. In addition to strength, with other properties of this steel in 0Cr18Ni9. It is mainly used for welding and soldering required for surface melting can not be handled after the corrosion resistance of equipment and components. The two steel, easy to produce in the environment and the resulting stress corrosion pitting and crevice corrosion under the conditions should be careful in the selection. 
 Feature 
 Has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, thermal processing such as punching and bending is good, no hardening heat treatment, non-magnetic. 
 Use 
 Household goods, cabinets, indoor pipes, water heaters, boilers, bathtubs, auto parts, medical equipment, building materials, chemical, food industry, agriculture, ship parts. 
 Chemical composition 
 Carbon C: ≤ 0.07 
 Si Si: ≤ 1.00 
 Manganese Mn: ≤ 2.00 
 Sulfur S: ≤ 0.030 
 Phosphorus P: ≤ 0.035 
 Chromium Cr: 17.00 ~ 19.00 
 Ni-Ni: 8.00 ~ 11.00 
 Mechanical properties 
 Tensile strength σb (MPa): ≥ 520 
 Conditions yield strength σ0.2 (MPa): ≥ 205 
 Elongation δ5 (%): ≥ 40 
 Reduction of area ψ (%): ≥ 60 
 Hardness: ≤ 187HBS; ≤ 90HRC; ≤ 200HV 
 Heat treatment process 
 Standard heat treatment: solution 1010 ~ 1150 ℃ fast-cooling. 
 Microstructure: Organizing for the austenitic type. 
 Because it contains high nickel and austenitic at room temperature showed a single-phase structure, so it is relative to the North with Cr13 stainless steel with high corrosion resistance, low temperature, room temperature and high temperature plastic go and have a higher toughness, and good cold forming and welding. However, the lower the intensity at room temperature, intergranular corrosion and stress corrosion tendency of large, poor machinability. Austenite no phase change when heated, it is not enhanced by heat treatment. Only to improve the corrosion resistance of steel heat treatment: 
 1) solution treatment; The goal is to fully dissolve the carbides, and retained in the austenite at room temperature, thus at room temperature by single-phase austenite, the steel has the highest corrosion resistance. 
 Solution treatment of heating temperature generally higher, between the 1050-1100C, according to the level of carbon content to make appropriate adjustments. As the poor thermal conductivity of 18-8 stainless steel, not only to warm up and then quenched by heating, but also in the solution heat treatment (quenching) when the holding time is longer. Solution treatment, we should pay special attention to prevent the growth of carbon. 18-8 will increase because of increased carbon steel to intergranular corrosion tendencies. Cooling medium, generally water. Organization after solution treatment is usually single-phase austenite, but titanium, niobium, molybdenum, stainless steel, especially when the castings, also contains a small amount of ferrite. Hardness after solution treatment is generally 135HBS so. 
 2) In addition to stress annealing; in order to eliminate the residual stress after cold working, processing at a lower temperature. Generally heated to 250-425C, is frequently used 300-350C. For non-titanium or niobium steel should not exceed 450C, in order to avoid chromium carbide precipitation caused by intergranular corrosion. 
 In order to eliminate the residual stress after welding, to eliminate the stress corrosion susceptibility of steel to the processing at higher temperatures. Heating temperature is not lower than 850C. Cooling for steel containing titanium or niobium can be directly cooled in the air; does not contain titanium or niobium for the steel should be cooled to 500C and then in the air after cooling. 
 3) stabilization process; order to prevent the titanium and niobium in the welding of austenitic stainless steel or solid solution, due to a decrease in TiC and NbC cause reduced resistance to intergranular corrosion, this stainless steel must be heated to a certain temperature (the temperature to completely dissolve in austenitic chromium carbide, while only partial dissolution of TiC and NbC) and then slow cooling. In the cooling process, so full of carbon steel and titanium and niobium compounds, stable precipitation of TiC and NbC, without precipitation of chromium carbides, thereby eliminating the 18-8 austenitic stainless steel to intergranular corrosion tendency, this process called stabilization treatment. 
 Delivery status 
 Generally heat treatment delivery, the treatment types specified in the contract; not indicated, according to the heat treatment state of delivery. 
 0Cr18Ni9Ti with intergranular corrosion resistance of titanium, 0Cr18Ni9 no. 
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