Inoculant for as-cast production of pearlite ductile iron and preparation process thereof

Abstract

The invention discloses an inoculant for as-cast production of pearlite ductile iron and a preparation process thereof. According to the preparation process, a medium-frequency electric induction furnace is used, an outside-furnace mix-melting method is adopted, and by controlling the adding time, adding mode and melting temperature of metal antimony, the silicon-antimony inoculant with the antimony content range being 0.1%-15% can be prepared. The method is simple, operation is convenient and rapid, the cost is low, the antimony metal yield can be increased by a large margin, energy consumption is reduced, protection of the environment is achieved, the working efficiency is improved, and the benefits are increased.

Description

technical field

[0001] The invention belongs to the field of casting, and relates to a preparation process of an inoculant, in particular to a silicon antimony inoculant for producing pearlite ductile iron in an as-cast state and a preparation process thereof. Background technique

[0002] Pearlitic ductile iron refers to ductile iron in which pearlite accounts for more than 80% of the matrix structure. Commonly referred to as high-grade ductile iron such as QT600-2, QT700-2, and QT800-2 belong to this type. It is mainly used to manufacture parts that require high strength, certain fatigue strength and wear resistance, such as diesel engine crankshafts, connecting rods, etc. Cast pearlitic ductile iron has the advantages of high strength, high hardness, high wear resistance, low production cost and long service life, etc., and has been widely used to replace molybdenum-chromium alloy cast iron and steel castings in recent years. Automobile panel mold blank. Pearlitic duct...