304: A high alloy steel resistant to air or chemical corrosive medium. Stainless steel is a kind of 304 stainless steel with beautiful surface and good corrosion resistance. It does not need surface treatment such as color electroplating, and gives full play to the inherent surface properties of stainless steel, which is used in many fields and is usually called stainless steel. High alloy steels such as 13 Cr steel and 18-8 Cr-Ni steel are its representative properties. From the metallographic point of view, because stainless steel contains chromium, a very thin chromium film is formed on the surface, which isolates the oxygen invading 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. 304 is a general-purpose stainless steel, which is widely used to manufacture equipment and parts that require good comprehensive performance (corrosion resistance and formability). 304 stainless steel is a stainless steel brand produced according to American ASTM standard. 304 is equivalent to domestic 0Cr19Ni9 (0Cr18Ni9) stainless steel. 304 contains 19% chromium and 9% nickel. 304 is the most widely used stainless steel and heat-resistant steel. Used in food production equipment, Xitong chemical equipment, nuclear energy, etc. Chemical composition specification of 304 stainless steel C Si Mn P S Cr Ni (Nickel) Su Mo 304 ≤ 0.08 ≤1.00 ≤ 2.00 ≤ 0.05 ≤ 0.0318.00-20.008.25 ~10. Corrosion resistance in the atmosphere, if it is industrial atmosphere or heavily polluted area, it needs to be cleaned in time to avoid corrosion. Suitable for food processing, storage and transportation. It has good machinability and welding performance. Plate heat exchanger, corrugated pipe, household goods, building materials, chemistry, food industry, etc. [Edit this paragraph] Standard international stainless steel labeling method The American Iron and Steel Association uses three digits to label various standard grades of malleable stainless steel. Among them: ① Austenitic stainless steel is marked with serial numbers of 200 and 300, and ② ferritic and martensitic stainless steel is marked with serial numbers of 400. For example, some common austenitic stainless steels are marked with 20 1, 304, 3 16, 310; ③ Ferritic stainless steel is marked with 430 and 446; Martensite stainless steel is marked with 4 10, 420, 440C duplex (austenite-ferrite) and ④ stainless steel. 4). Classification of standards 4- 1 Classification: ① national standard GB, ② industry standard Yb, ③ Local standards ④ Enterprise standards Q/ CB 4-2 classification: ① Product standards ② Packaging standards ③ Method standards ④ Basic standards 4-3 standard levels (divided into three levels): Y level: international advanced level I level: international common level H level: domestic advanced level 4-4 national standard GB 1220-84 stainless steel bar (I level) GB 424/KLOC-. -84 Stainless Steel Welded Disc Garden (H-class 56-84 Stainless Steel Welded Disc Garden (I-class) GB 128 3 16l: Nippon Steel 3 16L: 00Cr17Ni14Mo2 is the material grade, indicating that it mainly contains Cr. Chemical composition: C≤0.03, Si ≤ 1.0, Mn ≤ 2.0, S ≤ 0.03, P ≤ 0.035, Cr = 16.0 ~ 18.0, Ni =10.0. Conditional yield strength (MPa)≥ 177, aspect ratio (%)≥40, area shrinkage (%)≥60, hardness ≤187 HB ≤ 90 HRB ≤ 200 HV 321:stainless steel. The details are as follows: 32 1 chemical composition: carbon: 0.08 silicon: 1.00 manganese: 2.00 phosphorus: 0.045 sulfur: 0.030 nickel: 9.00- 12.00 chromium:17.00-/. S32 100, TP32 1 Japanese brand: SUS32 1 British brand: 304S 12, 32 1920 German brand: X10crniti/kloc-0. 32 1 stainless steel has excellent high-temperature durability and creep resistance, and its stress mechanical properties are better than those of 304 stainless steel. Industrial application: it is suitable for outdoor machines, heat-resistant parts of building materials and parts with difficult heat treatment in chemical, coal, petroleum and other industries 1 Petroleum waste gas combustion pipeline 2. Engine exhaust pipe 3. Boiler shell, heat exchanger, heating furnace components 4. Diesel engine silencing parts. Boiler and pressure vessel. Chemical transport vehicles. Expansion joint 8. Spiral welded pipe for furnace tube and dryer [edit this paragraph] 32 1 model Chinese name English name engine passenger number 32 1 airbus A32 1 airbus Industries a 32 1 jet174-220 performance data model: a321aircraft. ICAO code: A32/KOOC-0/Classification by wake intensity M Captain (m): 44.5/KOOC-0/Aircraft height (m):/KOOC-0/.8 Span (m): 34./KOOC-0/Airbus A32/KOOC-0. : Engine model: CFM 1 CFM56-5-B 1 Engine quantity: A32 1 Tsh: Airbus Industrial Company engine thrust (horsepower): 2× 133KN 45 degree crosswind (m/s): 90 degree crosswind. : 83,000 maximum landing weight (Kg): 73,500 maximum fuel-free weight (Kg): maximum load (Kg): maximum fuel load (kg): oil quantity (ltr): 23,700 average fuel consumption per hour (kg): 2355 maximum climb rate (ft/min): 2500 maximum climb rate (2,500). Maximum descent rate (m/s): service upper limit (m): 14850 departure distance (m): a32 1 landing distance (m): 1590 full range (km): 5000 ACN value: maximum cruising speed (KTS). .82 normal cruising speed (Kts): 447 normal cruising speed (km/h): 828 normal cruising speed (m): .78 minimum smooth speed (KTS): 2 10 minimum smooth speed (km/h): 388 final approach speed (KTS): 150. : 145 runway entrance speed (kts, km/h): 268 2cr 13 standard: GB/T 1220- 1992 ● Features and application scope: high hardness and good corrosion resistance in quenched state. Used as a turbine blade. The density of 2Cr 13 is 7.75g/m3. Quenching hardness: Generally, the quenching temperature of 2Cr 13 is 980 ~ 1050℃, and the hardness after oil quenching at 980℃ is obviously lower than that after oil quenching at 980℃. However, the microstructure obtained after quenching at 1050℃ is coarse and brittle. It is suggested that better microstructure and hardness can be obtained by quenching at 1000℃. 2Cr 13 martensitic stainless steel should be preheated during welding. Covered electrode, an austenitic stainless steel welded with Q235, does not need preheating, such as A302.A307. When welding, control the dilution rate of the weld, do not swing welding, and use less current. 2Cr 13 welding materials are optional: 1. G202 and G207 are selected for atmospheric corrosion resistance, which require preheating at 150-300 degrees and tempering at 700-730 degrees after welding; 2. Organic acid resistance and heat-resistant separation: G2 1 1, which needs preheating 150-300 degrees; 3. Good plasticity: A 102, A 107, A202, A207, A302, A307, preheating for repair welding and preheating for thick parts. ● Chemical composition: C: 0.16 ~ 0.25Si: ≤1.00mn: ≤1.00s: ≤ 0.030p: ≤ 0.035cr:12.00 ~/kloc-. ≥635 conditional yield strength σ0.2 (MPa): tempered, ≥440 elongation δ 5 (%): tempered, ≥20 area shrinkage ψ (%): tempered, ≥50 impact work Akv (J): tempered, ≥63 hardness: annealed, ≤ 223 HB; Quenching and tempering, ≥ 192HB ● heat treatment specification and metallographic structure: heat treatment specification: 1) annealing, slow cooling at 800 ~ 900℃ or rapid cooling at about 750℃; 2) quenching oil cooling at 920-980 DEG C; 3) Tempering at 600 ~ 750℃ and rapid cooling. Metallographic structure: the microstructure is martensite. ● Delivery status: generally, the goods are delivered in heat treatment status, and the type of heat treatment is indicated in the contract; If there is no stipulation, the goods shall be delivered without heat treatment. 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