Nodular cast iron nodulizer
A technology of nodular cast iron and nodularizing agent is applied in the field of casting alloy additives, which can solve the problems of high dosage and high nodularizing cost, and achieve the effects of good economic benefits, improving Mg absorption rate, and prolonging nodularizing decay time.
Inactive Publication Date: 2012-07-25
浙江华水管道科技有限公司
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Problems solved by technology
[0002] Chinese patent CN91108271.9 (as-cast high-strength nodular cast iron nodularizer) can obtain a matrix structure with a relatively high pearlite amount, but the dosage is relatively high, and the nodularization cost is relatively high
Method used
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Embodiment 1
[0019] Example 1 formula: its composition and weight percentage are respectively: Mg 36%, RE 7%, Ca 7%, Si 24%, Ga 2%, and the rest is iron.
Embodiment 2
[0020] The composition of Example 2, its composition and weight percent are: Mg 38%, RE 8%, Ca 8%, Si 30%, Ga 3%, and the rest is iron.
Embodiment 3
[0021] The formula of Example 3, its composition and weight percent are: Mg 40%, RE 9%, Ca 3%, Si 32%, Ga 5%, and the rest is iron.
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Abstract
The invention discloses a nodular cast iron nodulizer, wherein the components thereof are as follows by weight percentages: 36-45% of Mg, 6-10% of RE, 2-15% of Ca, 23-40% of Si, 2-8% of Ga, and the rest of iron; the nodulizer is made into particles after crushing with melting method; the granularity thereof is smaller than 2 mm; the particles are arranged in an internal steel tube positioned in aconcentric steel tube so as to form a core covering tube; a plurality of supporting ribs are arranged between the outer wall of the internal steel tube and the inner wall of the external steel tube; and the nodular cast iron nodulizer further comprises Ba. In the invention, the severity degree of Mg steam explosion can be released, thereby improving the Mg absorption rate, prolonging the reactiontime of the nodulizer, enhancing the matrix of peralite, having good roundness of globular graphite, and effectively increasing the mechanical property of graphite cast iron; besides, the nodulizer is high in tensile strength, small in adding amount, and low in cost.
Description
technical field [0001] The invention relates to a casting alloy additive, in particular to a nodularizer for nodular cast iron. Background technique [0002] Chinese patent CN91108271.9 (as-cast high-strength nodular cast iron nodularizer) can obtain a matrix structure with a higher pearlite amount, but the dosage is higher and the nodularization cost is higher. Moreover, the melting point and boiling point of magnesium are low, and when the nodulizer is added, the magnesium vaporizes rapidly and will bring out molten iron instead. Contents of the invention [0003] In view of this, the technical problem to be solved by the present invention is to provide a nodularizing agent for nodular cast iron with stable nodularizing effect, less added amount of nodularizing agent and good nodularizing effect. [0004] In order to achieve the above object, the present invention adopts following technical scheme to realize: [0005] A nodularizing agent for ductile iron, wherein: its...
Claims
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IPC IPC(8): C22C33/08C22C33/10C21C1/10
Inventor 龚辉弟
Owner 浙江华水管道科技有限公司