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304 stainless steel welded pipe

304 stainless steel welded pipe as a stainless steel heat resistant steel is used for food equipment, general chemical equipment, and atomic energy industrial equipment.

304 stainless steel is more resistant to rust than 200 series of stainless steel. High temperature resistance is also better, can be up to 1000-1200 degrees. 304 stainless steel has excellent corrosion resistance and better intergranular corrosion resistance.

304 stainless steel material concentration of more than 65% of boiling temperature following nitrate, with strong corrosion resistance. It also has good corrosion resistance for alkali solution and most organic acids and inorganic acids. A high alloy steel corrosion resistance in the air or chemical corrosion, stainless steel is a beautiful surface and good corrosion resistance, without plating surface treatment, its inherent surface properties of stainless steel, used in many aspects of steel, often called stainless steel. Represents the properties of 13 steel, chromium nickel steel and high alloy steel 18-8.

Weight formula for stainless steel welded pipe: [(outer diameter - wall thickness) * wall thickness]*0.02491=kg/ meters (weight per meter)

304 stainless steel welded pipe theory weight calculation formula: (outer diameter - wall thickness) x wall thickness * 0.02491= per meter weight (kilogram

Folding stainless steel welded pipe factory telephone: 18118868886 different contact.304 stainless steel welded pipe is a brand of stainless steel produced according to the ASTM standard of the United States. The 304 stainless steel welded pipe is equivalent to the 0Cr19Ni9 (0Cr18Ni9) stainless steel welded pipe in China. 304 chromium containing 19%, containing nickel 9%.

304 stainless steel welded pipe is the most widely used as the stainless steel heat-resistant steel, food equipment, general chemical equipment, atomic energy industrial equipment.

The 304 stainless steel welded pipe is a versatile stainless steel welded pipe. It is widely used to produce equipment and parts that require good comprehensive properties (corrosion resistance and formability).

304 stainless steel welded pipe is the most widely used stainless steel, heat-resistant steel. It is used in food production equipment, chemical industry equipment, nuclear energy and so on.

304 stainless steel welded pipe chemical composition specification C Si Mn P S Cr Ni (nickel) Mo

SUS304 = 0.08 = 1 = 2 = 0.05 = 0.03 18.00-20.00 8.25~10.50

From metallographical analysis, stainless steel contains chromium to form a thin chromium film on the surface, which separates the oxygen from the steel and acts as an anticorrosive agent. In order to maintain the corrosion resistance inherent to the stainless steel, the steel must contain more than 12% chromium.

Folding stainless steel welded pipe factory telephone: 18118868886 performance analysis..304 stainless steel welded pipe has good intergranular corrosion resistance, excellent corrosion resistance, cold working and stamping performance. It can be used as heat resistant stainless steel. At the same time, the mechanical properties of the steel at -180 C are still good. In solid solution state, steel has good plasticity, toughness and cold workability. It has good corrosion resistance in oxidizing acid and atmosphere, water and other media. Therefore, the production and consumption of 304 stainless steel is the largest and the most widely applied steel species.

304 stainless steel has good cold and hot workability. It can produce all kinds of metallurgical products such as forged bar, bar, wire, plate, strip and wire by using all kinds of cold and hot processing technology. The temperature range of hot processing is 900-1180 degrees. Cold processing is easy and has no special difficulties. Because the two steels are easy to cool and harden, when the cold deformation is too large, the intermediate annealing must be carried out to facilitate further processing.

1. heat treatment process

The solution treatment temperature of the 304 stainless steel welded pipe is 1080-1100 C, and the cooling way is water cooling or air cooling. The intermediate annealing temperature of cold processing is 850-970 degrees centigrade, and the heat is cooled for a certain time. After solid solution treatment, the microstructure of the steel is austenite, and sometimes a small amount of ferrite is found.

2 welding

The carbide precipitation of 304 stainless steel welded pipe can be welded by a general method. Manual electric arc welding, thin section size of carbon containing 0.04%-0.06% 304 stainless steel using AO 002 electrode, after welding can not have the tendency of intercrystalline corrosion, for thick section size, to keep the welding performance of resistance to intergranular corrosion of heat treatment after welding heat treatment, if not, should be changed to 304L stainless steel stable type steel or austenitic stainless steel.

3. cold forming properties

304 stainless steel sheet is often used in cold forming operation in the process of application. Its cold forming performance is an important technical index to measure the smooth molding and the rate of finished product. There are many factors affecting the cold forming of 304 stainless steel, and it is also very complicated. In terms of its metallographical factors, it is mainly the composition of steel, namely the ratio of chromium equivalent to nickel equivalent, and its elongation rate in conventional tensile properties is an important indicator. In order to obtain good cold forming properties, the ratio of chromium equivalent and nickel equivalent in steel should be controlled in a proper range.

4. application

Food equipment, general chemical equipment, and atomic energy industrial device components are widely used. It is suitable for deep drawing parts and acid pipeline, container and so on. This kind of steel is also used in the household appliances of vehicle and automobile parts box. It is the most produced and used steel in austenitic stainless steel, which is used in the production of thin-walled parts, acid pipeline and structural parts. It is also often used for welding Cr Ni stainless steel and stainless steel core, non magnetic components and components used in low temperature environment.

Folding stainless steel welded pipe plant telephone: 18118868886 marking method. Number and presentation method of steel

The international chemical element symbols and their symbols to represent the chemical composition, with Arabia letters content: such as: Chinese, Russian 12CrNi3A II with fixed number of digits to represent steel series or digital; such as: the United States, Japan, 300 series, 400 series, 200 series; using the Latin alphabet and order the serial number, only that the use of.

China's rules of numbering

The use of the symbol, Chinese Pinyin: P, steel rimmed steel: F