5 Ferrous Materials Flashcards
Materials that are cast to approximate finish shape and finished without deformation are specifically referred to as
Casting alloys
When the metal is fabricated by deformation process, an alloy design to have good ductility is specified and referred to as a
Wrought alloy
A mixture of iron ore, coke, and limestone is loaded in this for the reduction of the ore
Blast furnace
A crude casting, convenient for transportation, storage, and remelting of any metal
Pig
The composition of the metal tapped from the blast furnace, whether in liquid or stolid state is known as
Pig Iron
The composition of carbon in pig iron is
3 to 4%
When the carbon content in pig iron is reduced to less than 2% the result is called
Steel
The oldest known method of making higher carbon steel consisted of reheating wrought iron and powdered charcoal together in the
Cementation process
Steel of the highest quality is produced by this method
Electric furnace
Low carbon steel has approximately how much carbon
6 to 25 Points (.06%to .25%)
Medium carbon steel’s contain how much carbon
25 to 50 points (.25% to .5%)
High carbon steel contains how much carbon
50 to 160 points (.5% to 1.6%)
Material in which small amounts of alloying elements can raise the yield strength of hot rolled sections without heat treatment to 30% to 40% greater than that of plain carbon steels
Structural steel
AISI stands for
American iron and steel Institute
A stainless steel that can be hardened by heat treatment and have 4 to 6% chromium are known as
Martensitic
A stainless steel with chromium amounts greater than 30% and is particularly useful when corrosion resistance is necessary in cold work products
Ferritic
Stainless steel’s that contain 18% chromium and 8% nickel are referred to as
Austenitic
Stainless steel that is paramagnetic (practically unaffected by magnetic flux)
Austenitic Stainless Steel
In austenitic stainless steel, high levels of noise and attenuation serve to limit the effectiveness of this test
Ultrasonic testing UT
Defects in most wrought products tend to be aligned in
The direction of grain flow
Excessive stress concentration does not usually occur when
Changes in cross-section are gradual
Material that would have the least ductility
Gray cast iron
Defects and most wrought products tend to be aligned
In the direction of grain flow
