ASTM A270 Sanitary Tubes SS304/SS304L is a versatile stainless steel that is widely used to make equipment and parts that require good overall performance (corrosion resistance and formability).
SS304/SS304Lstainless steel is a grade of stainless steel produced according to American ASTM standards.
SS304/SS304L contains chromium 18%, nickel 8%.
SS304/SS304L is the most widely used stainless steel, heat-resistant steel, utility steel, China Industry Steel. For food production equipment, general chemical equipment, nuclear energy and so on.
ASTM A270 Sanitary stainless steel tubes SS304/SS304L are used as food equipment, general chemical equipment, and atomic energy industrial equipment as stainless heat-resistant steel.
ASTM A270 Sanitary Tubes SS304/SS304L rust resistance is stronger than 200 series stainless steel. It is also good for high temperature resistance and can reach as high as 1000-1200 degrees. 304 stainless steel has excellent stainless corrosion resistance and better resistance to intergranular corrosion.
ASTM A270 Sanitary Tubes SS304/SS304L has strong corrosion resistance in nitric acid below the boiling temperature below 65%. It also has good corrosion resistance to alkaline solutions and most organic and inorganic acids. A high-alloy steel that resists corrosion in air or chemically corrosive media. Stainless steel is aesthetically pleasing to the surface and has good corrosion resistance. It does not require surface treatment such as plating, and it exerts the inherent surface properties of stainless steel. A type of steel, usually called stainless steel. Representative performance of 13 chrome steel, 18-8 chromium nickel steel and other high alloy steel.
Hot-rolled (extrusion seamless steel tubes):
Tube blanks→Heating→Punching→Three-roller oblique rolling, continuous rolling or extrusion→Depipette→Sizing (or reducing)→Cooling→Blow tube→Heat straightening→Hydraulic test (or flaw detection)→Marking→Warehouse . Cold drawn (rolled) seamless steel tube: round tube blank → heating → piercing → start → annealing → pickling → oil coating (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → Hydrostatic test (flaw detection) → mark → storage.
304 stainless steel pipe is a grade of stainless steel produced according to American ASTM standards. The 304 stainless steel pipe is equivalent to the Chinese 0Cr19Ni9 (0Cr18Ni9) stainless steel pipe. 304 contains chromium 19%, nickel 9%.
304 stainless steel pipe is widely used as stainless heat-resistant steel, food equipment, general chemical equipment, and equipment for atomic energy industry.
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SS304/SS304L is equivalent to China's 0Cr19Ni9 (0Cr18Ni9) stainless steel. stainless steel tube is a versatile stainless steel tube that is widely used to make equipment and parts that require good overall performance (corrosion resistance and formability).
SS304/SS304L is equivalent to China's 0Cr19Ni9 (0Cr18Ni9) stainless steel. stainless steel pipe is the most widely used stainless steel, heat-resistant steel. For food production equipment, past chemical equipment, nuclear energy and so on.
304 stainless steel chemical composition specification C Si Mn P S Cr Ni (nickel) Mo
SUS304 ≤0.08 ≤1.00 ≤2.00 ≤0.05 ≤0.03 18.00-20.00 8.25~10.50
From the metallographic point of view, since the stainless steel contains chromium and forms a thin chromium film on the surface, this film separates and invades oxygen from the steel and plays a role in corrosion resistance. In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 12% chromium.
SS304/SS304L is equivalent to China's 0Cr19Ni9 (0Cr18Ni9) stainless steel. stainless steel tube has good resistance to intergranular corrosion, excellent corrosion performance and cold processing, stamping performance, can be used as heat-resistant stainless steel. At the same time, the steel still has good mechanical properties at -180°C. In the solid solution state, the plasticity, toughness and cold workability of the steel are good; the corrosion resistance is good in the oxidizing acid and the atmosphere, water and other media; therefore, the production volume and the use amount of the 304 stainless steel are the largest and the most widely used steel Species.
304 stainless steel has good cold and hot processing performance, can use a variety of general cold and hot processing technology to produce forging materials, bar, wire, plate, strip and wire and other metallurgical products, thermal processing temperature range of 900-1180 °C. Cold processing is easy, no special difficulties, because the two kinds of steel easy to cold hardened, when the amount of cold deformation is too large, the intermediate annealing process to facilitate further processing.
Heat treatment process
SS304/SS304L is equivalent to China's 0Cr19Ni9 (0Cr18Ni9) stainless steel. stainless steel tube solution treatment temperature is 1080-1100 °C, the cooling method is water-cooled or air-cooled. The annealing temperature in the cold processing is mostly 850-970°C, and it is water-cooled after holding for a certain time. After the solution treatment, the microstructure of the steel is austenite and sometimes a small amount of ferrite exists.
2 Welding
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SS304/SS304L is equivalent to China's 0Cr19Ni9 (0Cr18Ni9) stainless steel. stainless steel tube suppresses carbide precipitation during welding and can be welded by a common method. Manual arc welding, carbon containing 0.04%-0.06% thin section of 304 stainless steel can be Austrian 002 electrode, after welding, no intergranular corrosion tendencies, for thick section ruler, to maintain the resistance to intergranular corrosion after welding, need to After welding heat treatment, if not heat treatment, should be changed to 304L stainless steel or stable austenitic stainless steel.
3. Cold forming performance
304 stainless steel sheet is often used in cold forming operations during application. Its cold forming performance is an important technical indicator to measure whether it can be successfully formed and the yield is high or low.As far as its metallurgical factors are concerned, the composition of the steel is mainly the ratio of the chromium equivalent to the nickel equivalent, and the elongation in the conventional tensile properties is an important characterization index. In order to obtain good cold forming properties, the ratio of chromium equivalent to nickel equivalent in the steel should be controlled within a suitable range.
4. Application
Food equipment, general chemical equipment, and equipment components for the nuclear industry are widely used. Suitable for deep-drawn parts and acid pipes, containers, etc. This type of steel is also used in home appliances for vehicles and automobile parts boxes. It is the most produced and used steel in austenitic stainless steel for the production of thin-walled parts, acid transmission pipes and structural parts. It is also often used as a core material for welding chromium nickel stainless steel and stainless steel, non-magnetic parts, parts used in low temperature environments, etc.
