Steel Classification Essay

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Steel classification is significant in knowing what types are used in definite applications & which are used for others . For example, most commercial steels are classified into one of three groups: plain carbon steel, low-alloy steel, & high-alloy steel . Steel classification systems are updated frequently for this type of information .
Usually, carbon is the most significant commercial steel alloy . Increasing carbon content increases hardness & strength & improves hardness . But carbon also increases brittleness & reduces ductility because of its inclination to form martensite . This implies carbon content can be both a boon & a curse when commercial steel is cocerened .
& there are steels that have up to 2 % carbon content, they are the
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Stainless steels are at least 12 % chromium & high nickel contents . The three common types of stainless steels are:
1. Austenitic
2. Ferritic
3. Martensitic
Martensitic stainless steels is used to create the cutlery grades . They have the least quantity of chromium, offer elevated hardness, & need both pre- & post heating when welding to avoid cracking in the heat-affected zone (HAZ) .
Ferritic stainless steels have 12 to 27 % chromium with low amounts of austenite-forming alloys .
Austenitic stainless steels bid outstanding weldability, but austenite is not stable at room temperature . As a result, particular alloys must be added to stabilize austenite . The most important austenite stabilizer is nickel, & others include carbon, manganese, & nitrogen .
Special properties, including corrosion resistance, oxidation resistance, & strength at high temperatures, can be integrated into austenitic stainless steels by adding particular alloys like chromium, nickel, molybdenum, nitrogen, titanium, & columbium . & while carbon can increse strength at high temperatures, it can also decrease corrosion resistance by creating a compound with chromium .Austenitic alloys can't be hardened by heat treatment . That implies they don't harden in the welding HAZ
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