CN104651704A - A low-silicon inoculant - Google Patents

Abstract

A low-silicon inoculant is disclosed and used for inoculation treatment of molten iron in an iron foundry. The silicon content of the inoculant is 5-40%. Different alloy components are adopted for matching and blending according to requirements of castings. The inoculant can replace traditional inoculants. The silicon content is largely reduced. A large amount of scrap returns can be adopted for smelting to obtain molten iron for a foundry enterprise, thus saving the cost.

Description

Low silicon inoculant

1, technical field

The present invention is applied to iron casting field, when producing gray iron or iron casting, first need that the pig iron, steel scrap and foundry returns are put into smelting furnace and be fused into molten iron, in time coming out of the stove, add nucleating agent in inoculation bag, molten iron is poured in bag and is carried out inoculation in stove.Molten iron is after inoculation in process of setting, and in molten iron, the form of Graphite Precipitation and distribution situation all can be optimized, and make foundry goods reach desirable as-cast structure and mechanical property.The quality of nucleating agent on ironcasting has conclusive impact.

2, background technology

At present, the more next emphasis of domestic foundry enterprise is controlled cost, in melting material, the cost of the pig iron and steel scrap is all higher, adopt the quality of second-rate raw material then product again less than guarantee to reduce costs, if can adopt the foundry returns of enterprise self, the quality that can ensure product again can reduction enterprise production cost by a relatively large margin.But because the silicone content in foundry returns has reached the requirement of foundry goods, also nucleating agent will be added in fusion process, in nucleating agent, silicon content is higher, therefore the molten iron silicon content after melting easily exceeds standard, in order to ensure that the silicone content in molten iron meets casting quality requirement, the consumption of foundry returns is restricted and can not uses in a large number.

3, summary of the invention

Too high and the problem of foundry returns cannot be used in a large number in order to overcome silicone content in molten iron, the nucleating agent that the present invention must add from melting is started with, the silicon content of general Cast Iron Production nucleating agent is all about 70%, the silicon content of nucleating agent controls below 40% by the present invention, for carrying out inoculation to molten iron during Castiron Melting, its result of use is suitable with traditional nucleating agent, and such Cast Iron Production factory just can use foundry returns in a large number, saves cost.

4, embodiment

After the pig iron of silicone content 5-40% and ferrosilicon mixing raw material are fused into molten iron, any one in calcium, barium, strontium, zirconium and aluminium is added or multiple alloy carries out melting in smelting furnace, the content of calcium, barium, strontium, zirconium and aluminium adjusts to the scope of 0.1%-10%, pour out after melting evenly, liquation solidifies rear fragmentation.

Claims (1)

1. low silicon inoculant, silicone content controls 5 ~ 40%, it is characterized in that: the mode of employing metallurgical binding adds any one or multiple in calcium, barium, strontium, zirconium and aluminium in the molten iron of low silicon content, makes low silicon inoculant.