Spheroidizing agent is a molten iron additive in which graphite in cast iron precipitates in a spherical shape.Magnesium spheroidizing agent: using magnesium as the spheroidizing element, such as pure magnesium metal, nickel magnesium alloy, copper magnesium alloy, etc.Rare earth spheroidizing agent: a silicon magnesium iron alloy containing rare earth elements, divided into ordinary rare earth spheroidizing agents and yttrium based heavy rare earth spheroidizing agents.
Magnesium contents of 4%, 5%, and 5.5% belong to low magnesium spheroidizing agents, with RE ranging from 1% to 2%. They are mostly used for medium frequency furnace melting and spheroidizing treatment of low sulfur iron liquids. It has the advantages of slow spheroidization reaction and easy absorption of spheroidizing elements. The magnesium content of 6% and 7% belongs to the medium magnesium series of spheroidizing agents, which are mostly used for double melting in blast furnaces, electric furnaces, or medium frequency furnaces to melt pearl shaped cast ductile iron castings. Based on the thickness of the casting wall and the sulfur content of the original molten iron, determine the appropriate amount of spheroidizing agent to be added, with a wide range of applications and spheroidizing treatment processes. High magnesium series spheroidizing agent, suitable for blast furnace melting, iron liquid with sulfur content of 0.06% -0.09%, added in an amount between 1.6% -2.0%. Low aluminum spheroidizing agent is used for castings that are prone to subcutaneous porosity defects, as well as castings that require aluminum content in the molten iron. The spheroidizing agent produced from pure Ce and pure La has fewer impurities in the iron liquid after spheroidization treatment and round graphite spheres. The spheroidizing agent produced by yttrium based heavy rare earths is suitable for large section castings, delaying spheroidization decay and preventing block graphite. Sb containing spheroidizing agent is used for pearlite ductile iron. Low silicon spheroidizing agent is suitable for casting factories that use a large amount of recycled materials; Nickel magnesium spheroidizing agent is used for high nickel austenitic ductile iron.
Magnesium contents of 4%, 5%, and 5.5% belong to low magnesium spheroidizing agents, with RE ranging from 1% to 2%. They are mostly used for medium frequency furnace melting and spheroidizing treatment of low sulfur iron liquids. It has the advantages of slow spheroidization reaction and easy absorption of spheroidizing elements. The magnesium content of 6% and 7% belongs to the medium magnesium series of spheroidizing agents, which are mostly used for double melting in blast furnaces, electric furnaces, or medium frequency furnaces to melt pearl shaped cast ductile iron castings. Based on the thickness of the casting wall and the sulfur content of the original molten iron, determine the appropriate amount of spheroidizing agent to be added, with a wide range of applications and spheroidizing treatment processes. High magnesium series spheroidizing agent, suitable for blast furnace melting, iron liquid with sulfur content of 0.06% -0.09%, added in an amount between 1.6% -2.0%. Low aluminum spheroidizing agent is used for castings that are prone to subcutaneous porosity defects, as well as castings that require aluminum content in the molten iron. The spheroidizing agent produced from pure Ce and pure La has fewer impurities in the iron liquid after spheroidization treatment and round graphite spheres. The spheroidizing agent produced by yttrium based heavy rare earths is suitable for large section castings, delaying spheroidization decay and preventing block graphite. Sb containing spheroidizing agent is used for pearlite ductile iron. Low silicon spheroidizing agent is suitable for casting factories that use a large amount of recycled materials; Nickel magnesium spheroidizing agent is used for high nickel austenitic ductile iron.