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Alloy steels

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G H Patel College of Engineering and TechnologySubject :- Material Science and MetallurgyTopic:- ALLOY STEEL

BY: UTTAM TRASADIYAMECHANICAL ENGINEERINGGCET collegevvnagar.

GUIDE BY :-Ms. ELA JHA.

02-Feb-161

Alloy Steel - Introduction,02-Feb-162Alloying Changing chemical composition of steel by adding elements with purpose to improve its properties as compared to the plane Carbon steel.

Alloy Steels are irons where other elements (besides carbon) can be added to iron to improve:

Mechanical property - Increase strength, hardness, toughness (a given strength & hardness), creep, and high temp resistance.Increase wear resistance, Environmental property [Eg: corrosion].

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02-Feb-163Classification of metal alloysFerrousNon - ferrous

Cast IronSteels

Low AlloyHigh Alloy

Low CarbonMed.CarbonHighCarbonStainless Steel

Tool SteelWhiteGrey

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Classification of alloy steel

02-Feb-164

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Classification of alloy steelAlloy steels grouped into low, medium and high alloy steels.High-alloy steels would be the stainless steel groups.Most alloy steels in use fall under the category of low alloy

Alloy steels are, in general, with elements as: > 1.65%Mn, > 0.60% Si, or >0.60% Cu. The most common alloy elements includes: Chromium, nickel, molybdenum, vanadium, tungsten, cobalt, boron, and copper 02-Feb-165

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Low Alloys: Low Carbon02-Feb-166Composition: less than ~ 0,25% C ( 0,30%)Microstructure: ferrite and pearliteProperties: relatively soft and weak, but possess high ductility and toughnessOther features: machinable and weldable, not responsive to heat treatment - Plain carbon steelsApplications: auto-body components, structural shapes, sheets etc. High-strength low alloy (HSLA) steels: up to 10 wt% of alloying elements, such as Mn, Cr, Cu, V, Ni, Mo can be strengthened by heat-treatment

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Low Alloys: Medium Carbon SteelsComposition: 0.25< C

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