Metrode Nilsil description: Nilsil deposits mild steel weld metal with a very low silicon content of 0.10% maximum. It is designed specifically for the fabrication and repair of hot-dip zinc galvanising baths and lead pots. The steels used for these applications are usually either Armco iron, aluminium killed or rimming steel which are almost silicon free. A low silicon content is necessary to resist corrosion/erosion by molten zinc at the operating temperature of 450-500°C, particularly at the molten metal/air interface.