Material number: 253MA austenitic stainless steel
United States of America: UNS S30815 (F45)
German brand: W. Nr. 1.4835
253MA (S30815F45F451.4835) Overview of austenitic stainless steel:
253MA is a heat-resistant austenitic stainless steel designed for applications requiring high creep strength and good corrosion resistance. The operating temperature range is 850 ℃.
The chemical composition of 253MA (S30815CF45C1.4835) is equilibrium, which makes the steel have the most suitable comprehensive properties in the temperature range from 850 ℃ to 1100 ℃. The oxidation resistance of the steel is extremely high, and the starting temperature of the oxidation coating is as high as 1150 ℃. High creep resistance and creep fracture strength; good corrosion resistance and brush-resistance in most gas media; high yield strength and tensile strength at high temperature; Good formability and weldability, and sufficient machinability.
In addition to the alloy elements chromium and nickel, 253MA stainless steel also contains a small amount of rare earth metals, thus significantly improving its oxidation resistance. Nitrogen was added to improve creep properties and make the steel complete austenite. Although chromium and nickel contents are relatively low, this stainless steel has in many cases the same high temperature characteristics as high alloyed alloy steels and nickel based alloys.
253MA(S30815，F45，1.4835)Chemical composition of austenitic stainless steel：See table-1：
Because super austenitic stainless steel is a kind of austenitic stainless steel with high nickel and high molybdenum and containing copper and nitrogen, it is difficult to melt, easy to segregate, crack and so on, so super austenitic stainless steel has the highest requirement in the production process of stainless steel.
The most difficult variety, it is the concentrated embodiment of steel plant technology. Like other Cr-Ni austenitic steels, super austenitic stainless steels have good cold and hot working properties.
Folding application field
1.Petroleum, petrochemical equipment, such as the bellows in petrochemical equipment.
2, pulp, paper bleaching equipment, such as pulp cooker, bleaching equipment.
3, flue gas desulphurization device in power plant, the main parts are: tower of absorption tower, flue, door plate, interior, spray system and so on.
4.Offshore systems or seawater treatment, such as thin-walled condensing pipes cooled by seawater, desalination treatment equipment in power plants.
5.Salt industry, such as salt making or desalination equipment.
6. Heat exchangers, especially in conditions where chlorine ions are present.
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