304/304L Stainless steel tube is a versatile stainless steel that is widely used in manufacturing the equipment and components that require good overall performance (corrosion resistance and formability). 304 stainless steel is produced in accordance with the United States ASTM standard stainless steel a grade. 304 equivalent to China's 0Cr19Ni9 (0Cr18Ni9) stainless steel. 304 containing chromium 19%, containing nickel 9%. 304 is the most widely used stainless steel, heat-resistant steel, practical steel, steel industry. For food production equipment, general chemical equipment, nuclear energy and so on. In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 12% of the chromium.
Use range of 304/304L stainless steel tube:
stainless steel tube as a stainless steel heat-resistant steel is the use of food equipment, general chemical equipment, atomic energy industrial equipment.
stainless steel anti-rust performance than the 200 series of stainless steel materials to be strong. High temperature is also better, can be high to 1000-1200 degrees. 304 stainless steel has excellent corrosion resistance and good resistance to intergranular corrosion.
stainless steel in the concentration of ≤ 65% of the boiling temperature of nitric acid, has a strong corrosion resistance. Alkaline solution and most organic acids and inorganic acids also have good corrosion resistance. In the air or chemical corrosion medium can resist corrosion of a high alloy steel, stainless steel is a beautiful surface and corrosion resistance, do not have to wait through the surface treatment of color, and play the inherent surface properties of stainless steel, used in more A kind of steel, usually called stainless steel. On behalf of the performance of 13 chrome steel, 18-8 chrome nickel steel and other high alloy steel.
Performance analysis of 304/304L stainless steel pipe:
stainless steel pipe has good resistance to intergranular corrosion, excellent corrosion performance and cold processing, stamping performance, can be used as a heat-resistant stainless steel. At the same time, the steel at -180 ℃ under the conditions of its mechanical properties are still good. In the solid solution state of steel plasticity, toughness, cold workability in the oxidizing acid and atmospheric, water and other medium corrosion resistance, therefore, 304 stainless steel production and use is the largest, the most widely used steel Species.
stainless steel has good cold and hot processing performance, can be used a variety of cold and hot processing technology for the production of forging materials, bar, wire, sheet, strip and wire and other metallurgical products, hot processing temperature range of 900-1180 ℃. Cold processing easier, no special difficulties, because the two steel is easy to cold hardening, when the cold deformation is too large, the need for intermediate annealing, in order to facilitate further processing.
1. Heat treatment process
stainless steel tube solution treatment temperature of 1080-1100 ℃, cooling water or air cooling. Cold processing intermediate annealing temperature at 850-970 ℃, after a certain period of time after the water cooling. After the solution treatment of steel structure of austenite, and sometimes there are a small amount of ferrite.
stainless steel tube to suppress the welding of carbide precipitation, can be used to carry out a common method of welding. Manual arc welding, carbon 0.04% -0.06% of the thin section size of the 304 stainless steel can be used Austrian 002 electrode, after welding can not produce intergranular corrosion tendencies, for thick section ruler, to maintain the resistance after intergranular corrosion resistance, After heat treatment, if not heat treatment, should be changed to 304L stainless steel or stable austenitic stainless steel.
3. Cold forming performance
stainless steel sheet in the application process, often used for cold forming operation. Its cold forming performance is a measure of whether the smooth molding and yield of the important technical indicators. The impact of 304 stainless steel cold forming factors are more complex. In terms of its metallological factors is mainly the composition of steel, that is, chromium equivalent and nickel equivalent ratio, the conventional tensile properties of the elongation is an important characterization index. In order to obtain good cold forming performance, it is necessary to control the ratio of chromium equivalent to nickel equivalent in steel to an appropriate range.
Food equipment, general chemical equipment, atomic energy industrial parts, etc., are widely used. Suitable for deep-drawing and infusion pipes, containers and so on. Vehicles, auto parts box household appliances are also used in the steel. It is austenitic stainless steel production and the largest amount of steel, for the production of thin-walled parts, acid pipeline and structural parts. Also often used for welding chrome-nickel stainless steel and stainless steel core material, non-magnetic parts and low temperature environment, such as the use of components.
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