Metals and alloys Flashcards
Two groups of metals
Ferrous
Non-ferrous
Define ferrous metal
Metals that contain iron
Define non-ferrous metal
Metals that do not contain iron
What is the primary source of all metals
Ore
Define alloy
A material produced by combining two or more elements together to produce a new materials with refined properties
Name 4 pure metals
Copper
Gold
SIlver
Iron
Name 3 ways of stopping mild steel rusting
Paint it
Coat it in zinc (Galvanizing)
Plate it in silver
What tyw metallic elements make steel
Iron
Carbon
State 3 properties of copper
Ductile
Relatively malleable
Good conductor of heat and electricity
What metal is an alloy of copper and tin
Bronze
What metal is an alloy of copper and zinc
Brass
What is Corten steel
A metal which forms a rust.
It maintains a stable rust to stay corrosion resistant
Name 3 ways of joining metal using heat
Welding
Soldering
Brasing
What properties do most ferrous metals have
Most ferrous metals are magnetic
What does the carbon inside the ferrous metal provide
The carbon content means that most ferrous metals are prone to corrosion in the form of rust when exposed to moisture of oxygen
Properties such as hardness and malleability are directly related to their carbon content
The more carbon found in the metal, the harder and less malleable the metal becomes
Types of ferrous metals
Cast iron
Low carbon steel (mild steel)
High carbon steel (tool steel)
State the composition of cast iron
Iron and 3.5% carbon
State the properties of cast iron
Hard surface but has a brittle soft core
Strong compressive strength
Cheap
Common uses of cast iron
Vices
Car break discs
Cylinder blocks
Manhole covers
Composition of mild steel
Iron and 0.15 -0.35% carbon
Properties of mild steel
Good tensile strength
Tough
Malleable
Poor resistance to corrosion
Common uses
Car bodies
Nuts
Bolts
Screws
RSJ’s and girders
Composition of tool steel
Iron and 0.70 - 1.4% carbon
Properties of tool steel
Hard but also brittle
Less tough, malleable or ductile than medium carbon steel
Common uses of tool steel
Screwdrivers
Chisels
Taps
Dies
Most non-ferrous metals are____
What does this mean
Most non ferrous metals are non-magnetic which means that they can be use in electronic devices and wiring
Properties of non-ferrous metals
The absence of iron makes non-ferrous metals desirable for their malleable properties and for their resistance to corrosion
Examples of non-ferrous metals
Aluminium
Copper
Zinc
Tin
Composition of aluminium
Pure metal (often alloyed with copper and manganese depending on application)
Properties of aluminium
Lightweight, soft, ductile, malleable
Good conductor of heat and electricity
Corrosion resistant
Uses of aluminium
Aircraft bodies
High-end car chassis
Cans
Cooking pans
Composition of copper
Pure metal
Properties of copper
Extremely ductile and malleable
An excellend conductor of heat and electricity
Easily soldered and corrosion resistant
Common uses of copper
Plumbing fittings
Hot water tanks
Electric wire
Composition of zinc
pure metal
Properties of zinc
Weak in its pure state
High level of corrosion resitance
Low melting point
Easily worked
Uses of zinc
As a glavinised coating in crash barriers, corrugated roofing, intricate cast productss
Composition of tin
Pure metal
Properties of tin
Soft ductile malleable
Low melting point
Excellent corrosion resistance
Uses of tin
Coatings on food and drinks cans, solders
State examples of alloys
Brass
Stainless steel - ferrous alloy
Duralumin
Composition of brass
Alloy of copper (65%) and zinc (35%(
Properties of brass
Strong ductile
Casts well
Corrosion resistant
Conductor of heat and electricity
Uses of brass
Castings
Forgings
Taps
Wood screws
Composition of stainless steel
Alloy of steel including chromium (18%) and nickel (8%)
Properties of stainless steel
Hard and tough
Excellent resistance to corrosion
Uses of stainless steel
Sinks
Cutlery
Surgical equipment
Composition of duralumin
Alloy of aluminium (90%)
Copper (4%)
Magnesium (1%)
Manganese (0.5-1%)
Properties of duralumin
Soft strong malleable
Excellent corrosion resistance
Lighweight
Uses of duralumin
Aircraft structure and fixings
Suspension applications
Fuel tanks