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General Materials Forum: Deoxidation of steel and failure analysis

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    • CommentAuthorDr. Zee
    • CommentTimeJan 22nd 2007
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    One important aspect of failure analysis in steel components is the deoxidation of the steel in the melt shop. Molten steel is usually deoxidized with silicon. In deoxidation, the silicon removes the excess oxygen from the steel bath after it has done its job in removing carbon, and phosphorus which are impurities. The best steel structure will be fully deoxidized (killed) and will usually have a silicon residual ranging from 0.15 to 0.35 wt. %. The next level of steel structure is partially deoxidized (semi-killed) which is usually used to make structural steel or pipe and this type of steel will have a silicon level of 0.01-0.09 wt. %. The lowest level of steel structure is rimmed or capped steel which is used for sheet metal in automobiles or appliances. This steel is not deoxidized at all and will normally have a silicon residual of less than 0.005 wt. %. This shows one important aspect when dealing with failure analysis of steel, where the chemical analysis can be quite revealing.

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