CARBON STEEL -
Sometime this called as mild steel or steel.
What is called carbon steel?
Carbon steel is an alloy of Iron, Carbon, Manganese and silicon.
Why it is called carbon steel?
Because Carbon is the element that provides the strength to the steel . Can you imagine what is the concentration of carbon in the carbon steel- 0.2% to 0.3%. Surprising! This is 0.2% carbon provide a tensile strength of 60000 psi to steel.
As the concentration of carbon goes up strength increase and as carbon concentration decrease strength decrease
What happen as the concentration of carbon keep on increasing?
Strength goes increasing, but there is a negative effect as strength goes increasing the weld ability of steel decreasing. The primary mode of fabrication of steel is by welding. You can see that all carbon steel pressure vessel, columns and piping are fabricated by welding.
So steel should have excellent welding properties. That’s why the carbon concentration in carbon steel is limited to 0.3% more than this, welding properties are affected.
The most application of carbon steel is in refining, petrochemical process industries and manufacturing of engineering component up to 343 degree C. After this temperature the strength o carbon steel starts reducing drastically and hence not recommended.