Formation of the carbon monoxide bubbles can be eliminated through the addition of deoxidising agents such as aluminium, ferrosilicon and manganese. In the case of aluminium, the dissolved oxygen reacts with it to form aluminium oxide (Alumina, Al2O3). The formation of alumina not only prevents the formation of bubbles or porosity, but the tiny particles or inclusions also pin grain boundaries during heat treatment processes, preventing grain growth. Completely deoxidised steel are known as “killed steels”.
They have a more uniform analysis and are relatively free from ageing. For a given carbon and manganese content, killed steels are usually harder then rimmed steels.
Disadvantages:
The disadvantage of using killed steels is they often display deep pipe shrinkage.
Steels That are Typically Killed
Steel that are generally killed include:
· Steels with carbon contents greater then 0.25%
· All forging grades of steel
· Structural steels with carbon content between 0.15 to 0.25%
· Some special steel in the lower carbon ranges
What's the specific heat capacity of high carbon steel and low carbon steel?
High Carbon steel = normal carbon steel
Low Carbon steel = mild carbon steel
Contact: King Steel
Email: kingsteelpipe@gmail.com