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Silicon

Silicon is a dark grey, highly shiny, hard stuff with element no. 14. Silicon dioxide and silicate are especially useful in the manufacture of glass, cement and ceramics. Silicon is the basis for all modern electronics.

Silicon is a dark grey, highly shiny, hard stuff with element no. 14. Silicon dioxide and silicate are especially useful in the manufacture of glass, cement and ceramics. Silicon is the basis for all modern electronics.

The silicon content in the steel used is very important and has an essential consequence for the delivery as it affects the zinc layer thickness. It means, the zinc layer increases, and the customer must know the silicon content in order to meet his requirements.

If the customer wants a coating that meets the requirement of EN ISO 1461, then rimmed or aluminium-killed steels can be used in some cases.

Silicon killed steel with silicon content of 0.15-0.25% is also suitable for hot dip galvanizing, but it will provide zinc layer thicknesses higher than prescribed in EN ISO 1461. The constructions often need longer time in our zinc tank, so the process can be more expensive.

If you want a thicker zinc layer than prescribed in the Standard, you must choose a steel type with a higher silicon content. If the wanted zinc layer is not stated and present, then DOT aims to deliver according to the standard.

The table in the following link shows examples of the connection between layer thickness, thickness and silicon content:

See connection
Surface

If you want a shiny surface, the steel should be un-killed or aluminium-killed steel.

If you want a shiny surface, the steel should be un-killed or aluminium-killed steel.

In case the visual impression of the hot dip galvanized surface is important, for example by architectural constructions, the following terms for the material selection should be used, in the case of cold-rolled steel:

Si + 2,5 P < 0,04 weight percent.

Regarding hot-rolled steel the content of silicon is the most important thing, whereas the content of Phosphor is of less importance. The following terms for the material selection should be used:

Si < 0,02 and Si +2,5 < 0,09 weight percent.

Free-cutting steel is usually not suitable for hot dip galvanizing. Sulphur content above 0,18 weight percent causes the steel to be strongly etched by the acid stripping and the iron / zinc reaction becomes so strong that the steel is destroyed.

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