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Types of Stainless Steel

So  let's see one by one each of which type of Stainless Steel for first we will see something about stainless steel so here when nickel is added in the steel, for instance, the austenite structure of iron is stabilized okay this crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures for greater hardness and strength more carbon is added with proper heat treatment these steels are used for razor blades cutlery too and tools significant quantities of manganese have been used in many stainless steel compositions Magnus preserves an austenitic structure in the steel at a low cost than nickel stainless steels are also classified by their crystalline structure.

There are five types of stainless steel :
  • Austenitic stainless steels
  • Ferritic stainless steels
  • Martensitic stainless steels
  • Precipitation hardening
  • Duplex stainless steel

1. Austenitic Stainless Steels 

These stainless steels make up over 70% of the total stainless steel production these tails are non-magnetic, these steels outstanding stainless steels are non-magnetic in annealed conditions they cannot be hardened by heat treatment they can be hot worked or cold worked they contain a maximum of 0.15 carbon a minimum of 16% chromium and sufficient nickel and manganese to retain an austenite structure at all temperatures from the cryogenic region to the melting point of the alloy these steels are specified as AISI 202, 302, 304,  316, 321, etc. They are non-magnetic soft ductile malleable in character the corrosion resistance of this group of steels is superior to ferritic and martensitic stainless steels these steels are used for food and chemical plants tubular exchangers sanitary fittings aircraft heaters domestic and industrial utensils.

2. Ferritic Stainless Steels

These are plain chromium stainless steels with varying chromium content between 11% and 18% but with low carbon 0.08 to 0.2 contained they have a moderate good corrosion resistance okay moderate good corrosion resistance ferritic stainless steels have these steels are not hard enabled by heat treatment by martensitic transformation due to the absence of austenite phase okay at any temperature the only annealing heat treatment is suitable for ferritic stainless steel so only annealing hate treatment these stills can be moderately hardened by cold working the stills are specified as AISI four zero five four three zero and four four six they are magnetic soft ductile malleable in character these tails are widely used for furnace parts food industries especially pressure wheezes heaters use carrying pipes in sugar industries pots and pans.

3. Martensitic Stainless Steels

Martensitic stainless steels are commercially developed for cutlery purpose they are plain chromium steels containing between 12 to 18% chromium high carbon content to 0.1 to 1.2% compared to other grades of stainless steels the stainless steel is of your friends it has moderate corrosion resistance, moderate corrosion resistance which can be hardened by heat treatment resulting in high strength and hardness, it has poor weldability. It is martensitic stainless steel is a magnetic on these steels are specified as AISI four 403, 410, 416, 420, 501, and 502. It is commonly used for knife blades surgical instruments shafts turbine blades paper machinery parts spindles and pins.

4. Precipitation hardening Stainless Steels 

Precipitation hardening stainless steels are iron nickel-chromium alloys containing one or more precipitation hardening element such as aluminum titanium copper niobic mend molybdenum the precipitation hardening is achieved by the relatively simple aging treatment is used for precipitation hardening here friends of the fabricated part the two main characteristics of all precipitation hardening stainless steels are high strength and high corrosion resistance high strength is achieved at the expense of toughness the corrosion resistance of precipitation hardening stainless steels is comparable to that of the standard AISI 304 and AISI 316 austenitic alloys.
Now the aging treatments redesigned here to optimize the strong corrosion resistance and toughness, further to improve toughness the amount of carbon is kept low the precipitation hardening processing valves the formation precipitation of very fine intermetallic carbides prolonged aging causes the coarsening of these intermetallic phases which in turn causes the decline in strength due to the fact that dislocations can bypass cores intermetallic phases these stills used for bulkheads nibs skins and other structural parts.

5. Duplex Stainless Steels

These steels contain relatively highchromium18 to 28% and moderate amounts of Nickel 4.5 to 8% the Nickel content is insufficient to generate a fully or genetic structure and the resulting combination of austenitic structure is called duplex okay the combination of ferreting and austenitic structure is called here duplex most duplex trees contain molybdenum in a range of 2.5 to 4% these have a high resistance to stress corrosion cracking and chloride iron attacks they have a higher tensile and ill strength than austenitic of hypotonic steels as well as good weldability and formability they are commonly used in marine applications discharge desalination plants heat exchangers and petrochemical plant.

Also, Read: Connection Between NPT, BSPT, and BSP Thread

 

 

 

 

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