Difference between carbon steel and Killed carbon steel

Killed carbon steel (KCS) deoxidized with a strong deoxidizing agent such as silicon or aluminum in order to reduce the oxygen content to such a level that no reaction occurs between carbon and oxygen during solidification of the molten steel in the ingot. Killed steel products will produce a more chemically uniform analysis from the bottom to the top of the ingot.

Killed steel is considered having less chemical segregation than semi-killed or rimmed steel.

Carbon steel is classified as carbon steel when no minimum content is specified or required for aluminum, boron, chromium, cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium, or zirconium, or any other element added
to obtain a desired alloy effect; when the specified minimum for copper does not exceed 0.4% or when the maximum content specified for manganese does not exceed 1.65%; silicon 0.6%; copper 0.6%.

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