Selection of spheroidizing agent and inoculating agent?
1. Selection of spheroidizing agent :
(1) 4%, 5% and 5.5% magnesium content belong to low magnesium spheroidizing agent , RE between 1% and 2%, mostly used for intermediate frequency furnace smelting, low sulfur liquid spheroidizing treatment. It has the advantages of mild spheroidization reaction and easy absorption of spheroidized elements.(2) magnesium content of 6%, 7% is a magnesium series of spheroidizing agent, mainly used for cupola, electric furnace double smelting, or intermediate frequency furnace smelting pearlite shape as cast nodular cast iron castings. According to the casting wall thickness and the sulfur content of molten iron, the appropriate amount of spheroidizing agent was determined.
(4) Low aluminum spheroidizing agent is used for castings prone to subcutaneous porosity defects and castings requiring aluminum content in liquid iron.
(5) The spheroidizing agent produced by pure Ce and La has less inclusions in the pure liquid iron and rounded graphite spheres after spheroidizing treatment. The spheroidizing agent produced by yttrium heavy rare earth is suitable for large section castings, delaying spheroidizing decline and preventing massive graphite. Spheroidizing agent containing Sb is used for pearlitic nodular cast iron.(6) Low silicon spheroidizer is suitable for casting factories that use a large amount of recycle charge; Nickel-magnesium spheroidizing agent is used in high nickel austenitic ductile iron.
2. Selection of inoculation agent :
(1) Si, Ba, Ca, Al alloys are widely used, the inoculation effect is very ideal and the dosage is small. Barium is a highly active element and a silica-barium inoculant of low calcium barium. It has strong graphitization ability and is the best choice for gray cast iron, ductile cast iron and vermicular cast iron castings.(2) advanced deoxidation inoculant, with strong deoxidation, and silicon, cost saving, used to prevent pores and subcutaneous pores.
(3) Silicontium inoculant does not increase the number of eutectic groups in gray cast iron, but the graphitization effect is good, and the white mouth effect of thin-wall and uneven thickness castings is significant, so it can prevent leakage of thin-wall and uneven thickness castings (cylinder block and cylinder head).(4) High aluminum low calcium ferrosilicon inoculant, eliminate gray iron whitemouth effect significantly. Bismuth-containing ferro silicon inoculant makes up for the deficiency of bismuth alone. Silica-zirconium inoculant can refine austenite dendrite and improve the strength of cast iron. The addition of manganese in inoculant can reduce the melting point of multiple alloy and facilitate diffusion and absorption in liquid iron, especially in this aspect.
(6) The inoculating block in the mold is a relatively resource-saving treatment with good inoculating effect. The pouring system is equipped with foam ceramic filter, which constitutes a combination of producing high-quality castings. Inoculating block will be favored by more foundry enterprises.
(7) Specially produced covering agent, pure composition, uniform particle size, more conducive to obtain stable high-quality casting products.People also Like Knowledge
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Rare Ferro Silicon Magnesium As Spheroidizing Agent
$1,345.00 - $1,350.00 / Ton