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By trunnano | 22 July 2022 | 0 Comments

Types of Stainless Steel

Ferrite
Ferritic stainless steel contains iron, carbon and 10.5% chromium. They may contain other alloy elements, such as molybdenum or aluminum, but they usually contain very little. They have a body-centered cubic (BCC) crystal structure-the same as pure iron at ambient temperature.
 
Because of its crystal structure, Ferritic stainless steel is magnetic. Their relatively low carbon content produces a corresponding low intensity. Other weaknesses of the ferrite type include poor solderability and reduced corrosion resistance. However, because of their excellent toughness, they are ideal for engineering applications. Ferritic stainless steel is commonly used in automobile exhaust pipes, fuel lines and architectural decoration.
 
Austenite
Austenitic stainless steel has a face-centered cubic (FCC) crystal structure, which consists of iron, carbon, chromium and at least 8% nickel. Because of their high chromium and nickel content, they are highly corrosion resistant and non-magnetic. Like Ferritic stainless steel, austenitic stainless steel cannot be hardened by heat treatment. However, they can be hardened by cold work. The high nickel content in austenitic stainless steel enables it to operate well in low temperature applications.
 
The two most common stainless steels-- 304 and 316-- are austenitic stainless steels. The main driving force behind the popularity of austenitic stainless steels is their ease of forming and welding, making them ideal for efficient manufacturing. Austenitic stainless steel has many subgroups, and its carbon content varies greatly. These properties are further adjusted by adding alloy elements such as molybdenum, titanium and copper. Austenitic stainless steel is often used in the production of kitchen sinks, window frames, food processing equipment and chemical cans. They are also commonly used for outdoor furnishings, such as benches, stainless steel posts and bicycle frames.
 
Martensite
Martensitic stainless steel has a body-centered square (BCT) structure. They contain 12 Mel 18% chromium and have a higher carbon content than austenitic or Ferritic stainless steel (0.1 mi 1.2%). Like ferrite BCC structure, BCT is magnetic. Martensitic stainless steel is useful when the strength of the steel is more important than its weldability or corrosion resistance. The main difference is that martensitic stainless steels can be hardened by heat treatment because of their high carbon content. This makes them available for many applications, including aeronautical parts, cutlery and blades.
 
Duplex
Duplex stainless steel is the latest type of stainless steel. Compared with austenitic stainless steel, they contain more chromium (19-32%) and molybdenum (up to 5%), but significantly lower nickel content. Duplex stainless steels are sometimes called austenitic-ferrite because they have mixed ferrite and austenitic crystal structures. About half of the mixture of austenitic phase and ferrite phase in duplex stainless steel gives it unique advantages. They are more resistant to stress corrosion cracking than austenite grade, tougher than ferrite grade, and about twice stronger than the pure form of both. The main advantage of duplex stainless steel is that the corrosion resistance of duplex stainless steel is equal to or higher than that of austenite under chloride exposure.
 
Duplex stainless steel is also very cost-effective. The strength and corrosion resistance of duplex stainless steel are achieved by lower alloy content than the same austenite grade. Duplex stainless steel is often used in the production of parts exposed to chloride applications in desalting and petrochemical industries. They are also used in the construction and construction industries of bridges, pressure vessels and drawbars.
 
Precipitation hardening
Precipitation hardening stainless steel can have a series of crystal structures, but they all contain chromium and nickel. Their common characteristics are corrosion resistance, easy to manufacture and extremely high tensile strength of low temperature heat treatment.
 
Most austenitic precipitation hardening alloys have been replaced by higher strength superalloys. However, semi-austenitic precipitation hardening stainless steel continues to be used in aerospace applications, even in new forms. Martensitic precipitation hardening stainless steel is stronger than ordinary martensitic stainless steel and is often used in the production of bars, bars and wires.
 
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