Metallurgy Flashcards
Metals have iron as the major ingredients and are usually magnetic
Ferrous metals
Metals that do not have iron in large enough amount to have any major influence on the properties of metals
Non-ferrous metals
What is the most practical method of identifying a metal?
by visual appearance, texture and color
What are the most important properties to consider for metals?
- hardness
- ductility
- toughness
- tensile strength
- machinability
The ability of a metal to resist penetration and plastic deformation?
hardness
The ability of a metal to deformed permanently without breaking?
ductility
The ability of a metal to withstand shock and impact without breaking or shattering is?
toughness
The ability of a metal to withstand pull without breaking is?
tensile strength
The ease at which you can cut and shape a metal is known as?
machinability
The most common metal material is?
carbon steel
What is the most common material used in the industry?
aluminium
If a piece of a metal has a smooth outer surface, what might you conclude about the object?
it has been formed
If an object is irregularly shaped, what might you conclude the object?
it is a casting
What are the different ways of identifying metals?
- color
- visual appearance
- weight
- texture
- shape
Given two identical pieces of metals, zinc dye cast and aluminium, what would be the simplest way to identify them?
by their weight
How can you distinguish between hot rolled and cold rolled steel?
*Hot rolled steel has a black mill scale or a heat scale surface
List all carbon steel sub-groups
- low carbon
- medium carbon
- high carbon
What are the two (2) main divisions of metals?
- Ferrous Metals
* Non-Ferrous Metals
Low carbon steel has
.02 - .30 % carbon
Medium carbon steel has
.30 - .60 % carbon
High carbon steel has
anything over .60%
What is considered to be cast iron?
Anything over 1.7%
The three special types of allow steel are?
- high strength low allow steel (HSLA)
- quench and temper structural steel
- maragine steel
What are the two types of high speed steel?
- tungsten (Type-T)
* molybdenum (Type-M)
What are the three types of stainless steel?
- austenitic stainless steel
- ferritic stainless steel
- martensitic stainless steel
The two principal alloy for copper are?
- brass
* bronze
A mixture of copper and zinc makes
Brass
A combination of copper and tin is?
Bronze
The principal types of bronze are?
- phosphor-bronze
- silicon line bronze
- aluminium line bronze
- beryllium bronze
The structure of soft steel is called?
Pearlite
Ferrite is?
pure iron
What is cementite type?
Is a carbide compound form from iron and carbon
The precise amount of ferrite and cementite depends on?
the percentage of carbon in the steel
The basic heat treating processes for steel are?
- hardening
- tempering
- annealing
- normalizing
The proper hardening temperature is reached when the work piece is?
Cherry red color
How is tempering done?
immediately after hardening or it will crack
You can achieve a more control temper by?
heating the work piece in oil, sand, salt, or lead bath
What are the sub-groups of which metals belong to?
- carbon steel
- alloy steel
- tool steel or high speed steel
- stainless steel
- aluminium and its alloys
- copper and its alloys
- cast iron
When the heat code identification number is cut from a piece of plate, what should you do?
Transfer the id number to the remaining plate
What is the most precise method for the identification of a metal that has been shipped from a steel mill?
study the mill test report
In addition to the mill test report what else do steel mills usually attached to the straps that holds the bundles of bar stock together
Metal specification tags
The lower critical temperature of steel is always at around?
1333°F or 723°C
Which element found in some copper alloy is a significant health hazard?
Beryllium
What are the two types of hardness testing?
- rockwell hardness testing
* brinell hardness testing
If you are told a work piece has a rockwell C-65, what would that mean
it has been hardened
When distortion from heat treatment must be kept to a minimum, which type of steel should be use?
Air hardening steel
Tubing is sized according to its
outside diameter
