Hot work tool steels are used for Forging,
forming,shearing,
pressure die casting and punching at elevated temperatures which maintain their Wear resistance,
mechanical properties
etc at these elevated temperatures.
ALLOY STEEL
An alloy is a substance consisting of two or more chemical elements with one of them being a metal thus resulting in desired metallic properties.Steel is an alloy of Iron and carbon.
Functions of main Alloying elements
| Carbon(C) | Directly
influences the hardness and strength of the steel, decreases toughness. |
| Chromiun(Cr) | Improves
Hardenability, high temperature strength, wear resisitance and even
corrosion resistance(Cr>14%). |
| Cobalt(Co) | Improves
retention of hardness at high temperatures. |
| Molybdenum(Mo) | Increases
yield point and strength. Improves Hardenability and wear resistance. Manganese Lowers effects of Iron sulphides, increases hardenability, wear resistance. |
| Nickel(Ni) | Increases
toughness at lower temperatures, slows the corrosion process. |
| Tungston(W) | Improves
toughness, grainstructure, high temperature strength, wear resistance,
etc. |
| Vanadium(V) | Increases
wear resistance, high temperature strength, retention of hardness
etc. |
| Silicon(Si) | It
is a deoxidizing agent. Increases strength and wear resistance. It is of importance that certain elements are as low as possible. Elements like Hydrogen, Oxygen, Nitrogen, Phosphorous, Sulphur create defects inside & also reduce the mechanical properties of steels. |
It is of importance that certain elements are as low as possible.
Elements like Hydrogen,Oxygen,Nitrogen,Phosphorous,sulphur
create defects inside also reduce the mechanical properties of steels.
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