Metal alloying is the method that provided the specific type of steel
Many times, normal steel can not be suitable for some specific job and need some special metal for that purpose. Metal alloying is the method that provided the specific type of steel for that purpose. Alloy steel is made up containing various types of elements such as nickel, chromium, nickel, vanadium, molybdenum, tungsten, cobalt, boron, copper, manganese, silicon, phosphorus, sulfur, etc.
The purpose of alloying these elements in steel is to give more:
Corrosion resistance
Strength of ferrite
Hardenability
Grain size control
Temperature stability
Ductility
Composition of Alloy steel
Element
Percentage
C
0.2-0.4%
Si
0.3-0.6%
Cr
0.4-0.6%
Mn
0.5-1.0%
Ni
0.4-0.7%
Mo
0.15-0.3%
Fe
Balance
Properties of ingredients
The Carbonelement is responsible for hardness, tensile strength, and mechanical strength in steel. Since carbon controls the hardness of steel, its melting point is also effective.
The Manganese element is responsible for markedly strength and hardness and it lowers both ductility and weldability if present in a high percentage with high carbon content in the steel.
The Silicon element is responsible for improved oxidation resistance and strengthens low alloy steel.
The Nickel element is responsible for the increased stiffness and resistance to impact.
The Chromium element prevented corrosion and oxidation and also improves resistance to abrasion.
The Molybdenum element is responsible for the hardness of steel, it makes it granular, tends to be tough in nature, and increases tensile and creep strength at high temperatures.
The Vanadium element is responsible for promoting fine grains in steel and increasing strength also.
The Tungsten element is responsible for the hardness of steel.
The Copper elements resist atmospheric corrosion.
Boran is responsible for hardenability.
Titanium reduces martensitic hardness.
Types of Alloy Steel
Alloy steel may be classified as follows:
Low alloy steel
Medium alloy steel
High alloy steel.
LOW ALLOY STEEL-Low alloy steels are good resistance to atmospheric and other mildly corrosive environments such as steel having yield strength values between 50000 and 80000 psi, low alloy steels are more expensive than carbon steel.
The composition of low alloy steel is as follows:C-0.12%,Mn-0.60,Si-0.30%,Cu-1.1%,Ni-0.55%,Fe-Balance.
Electrodes For Alloy steel
The Detail of electrodes with material description.
Welding Applications
:- Alloy steel can be welded by mostly all welding processes, some common welding processes for alloy steel are as follows:
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