... China are professional manufacturer of ferro silicon,ferro silicon magnesium,calcium silicon,ferro silicon barium,ferro silicon aluminum,ferro silicon magnesium cored wire,caclium silicon cored wire and so ... %, Fe rest Re 0.5-2.0%, Mg 6.0-8.0%, Si 45-48%, Fe rest ... Re 2.0-4.0%, Mg 6.0-8.0%, Si 45-48%, Fe rest ... or SGS Standard GB/T 4138-93 ferro silicon magnesium rare earth alloy(Re-FeSiMg)