metal final ppt

7/31/2019 Metal Final Ppt

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Metal

P.Ambika

09011BB009


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Introduction to metal

A metal is an element, compound, or alloy that is a

good conductor of both electricity and heat

Types of metals:

1. Alkali metals

2. Alkaline earth metals

3. Transition metals

4. Post-transition metals
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Physical properties of metals

Metals are solids. (except mercury)

Metals are hard. (except Lithium, Potassium,

Sodium)

Metals have metallic luster. (shine)

Metals are malleable. (can be beaten into thin

sheets)

Metals are ductile. (can be drawn into wires)

Metals have high melting points. (Gallium and

Cesium have low melting points. They melt in the

palm of the hand)

Metals have high boiling points.


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Metals are good conductors of heat. ( Best

conductors are silver and copper. Poor conductors

are Lead and Mercury)

Metals are good conductors of electricity. ( Best

conductors are Silver and Copper)

Metals are sonorous. (produce sound when

beaten)


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The arranging of metals in the decreasing order oftheir reactivity is called reactivity series of

metals.

K - Potassium Most reactive Na - Sodium

Ca - Calcium

Mg - Magnesium

Al - Aluminium Zn - Zinc Reactivity decreases

Fe - Iron

Pb - Lead

H - Hydrogen Cu - Copper

Hg - Mercury

Ag - Silver

Au - Gold Least reactive


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Use of steel

Depending upon the carbon content, the steel is

designated as the mild steel or medium carbon

steel or high carbon steel

The carbon content of mild steel is about 0.10 to

0.25 %

When carbon is less than 0.10% it is known as the

dead steel or very low carbon steel

The carbon content of medium carbon steel is

about 0.25 to 0.60%

The high carbon steel is also known as the hard

steel and its carbon content varies from 0.60 to

1.10% or so


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Where do we use metals in a

building foundations, floors, ceilings, roofs, trusses, walls,

doors, windows, interior finishes, and floor

coverings.

Steel Strongest material in common use

Aluminum Often melts and drips in fires

Copper ,brass, GI Primarily used for piping and

copper wiring

Zinc Primarily used as a protective coating formetals

Construction -- Nails in conventional lumber

construction and structural steel in other

buildings, screw head


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Metal is used as structural framework for larger

buildings such as skyscrapers, or as an external

surface covering.

Other metals usedinclude titanium, chrome, gold, silver. Titanium can

be used for structural purposes, but it is much more

expensive than steel

Galvanized Steel for metal roof
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Metal is used for external finish and support

for the purpose of construction, there are many

types of metals used depending upon the nature

of work

Selection of metal depends upon its resistivity

against corrosion


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hot dip galvanized steel

this type of steel is particularly used in buildings

where the building's metal structure has to be

protected from corrosion

The hot-dip galvanized beams are frequently used

in certain places, where the strength of a high-

tempered metallic structure is required, to support

the heavy mass of concrete

the additional zinc layer on the metal, effectively

protects the material from affects of weathering,giving it a long lasting durability


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Steel Bars for RCC Work

Generally there are two types of steel

bars available in the market.

Mild steel bars

Deformed steel bars

Steel bars used for construction work


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Anatomy of a Metal Building - Showing theprimary framing, secondary framing, roof/wall

cladding, and bracing.


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Five Primary Metal Types

Aluminum: aluminum roof and wall systems of

commercial buildings.

Copper: Long life and low maintenance

Steel

Terne: Terne is produced by coating metals such

as carbon steel and stainless steel .which contains

80% led and 20% tin.

Zinc: Zinc is a natural material that never fades

and retains its look over its entire life span. It is

also a noncorrosive, environmentally friendly

product with a 100%-clear water runoff.


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Metals that are used in

wiring

used in house wiring Copper and

aluminium . Aluminium is typically

used in the entrance cable and

copper for everything past thebreaker panel.

copper or even more often brass


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Corrosion

Corrosion is the damage caused to metals due to

the reaction of metals with oxygen, moisture,

carbon dioxide etc

Eg :-

Formation of brown coating of rust over iron

Formation of green coating of basic copper

carbonate over copper

Formation of black coating of silver sulphide over

silver


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Prevention of corrosion

Corrosion of metals can be prevented by :-

i) Applying oil or grease.

ii) Applying paint.

iii) By galvanization. (Coating with zinc) iv) By tinning. (Coating with tin)

v) By electroplating. (Coating a less reactive metal

like chromium)

vi) By alloying. (Making alloys)


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metal final ppt

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