What’s Killed Carbon Steel?

During the steel making process, oxygen may become dissolved in the liquid metal. During solidification, the dissolved oxygen can combine with carbon to form carbon monoxide bubbles. The carbon is added to the steel as an alloying element.
The carbon monoxide bubbles are often trapped in the casting and can act as initiation points for failure.
Killed Carbon Steel are defined as those which are thoroughly deoxidized during melting process. Deoxidation is accomplished by use of silicon, manganeese and aluminium additions to combine with dissolved gases, usually oxygen, during steel making. This results in cleaner, better qualtity steel which has fewer gas pockets and inclusions. Killed carbon steel is specified for major equipment in the following services to minimise the possibility or extent of hydrogen blistering and hydrogen embrittlement:
Where hydrogen is a major component in the process stream.
Where hydrogen sulphied H2S is present with an aqueous phase or where liquid water containing H2S is present.
Process streams containing any amount of Hydro flouoric acid (HF), boron trifluoride (BF3) or (BF) compounds; or
Monoethanolamine (MEA) and diethanolamine (DEA) in solutions of greater than 5 weight percent
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