Ductile iron casting and manufacturing method thereof
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A manufacturing method and casting technology, which are applied in the field of ductile iron castings and their manufacturing, can solve the problems of high production cost and insufficient economic benefits, and achieve the effects of low production cost, good comprehensive mechanical properties, and good inoculation effect.
Inactive Publication Date: 2016-03-30
TIANJIN ZHONGDA PRECISION MACHINERY
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Although the addition of these precious metals reduces the heat treatment process...
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Embodiment 1
[0025] A ductile iron casting, its chemical composition is: C3.5%, Si2.5%, Mn0.4%, P≤0.1%, S≤0.03%, Ti<0.04%, Mg residual 0.030~0.045%, Re residual 0.005-0.015%, the rest is Fe.
Embodiment 2
[0027] A ductile iron casting, its chemical composition is: C3.7%, Si2.9%, Mn0.45%, P≤0.1%, S≤0.03%, Ti<0.04%, Mg residual 0.030~0.045%, Re residual 0.005-0.015%, the rest is Fe.
Embodiment 3
[0029] A ductile iron casting, its chemical composition is: C3.8%, Si3.2%, Mn0.5%, P≤0.1%, S≤0.03%, Ti<0.04%, Mg residual 0.030~0.045%, Re residual 0.005-0.015%, the rest is Fe.
[0030] The preparation process of ductile iron castings in the above embodiment may further comprise the steps:
[0031] ①Raw material inspection: detect the content of C, Si, Mn, S, P in raw materials;
[0032] ② Proportion of raw materials: Raw materials that pass the inspection are fed into Q12 pig iron 56%, scrap steel 8%, and recycled materials 36% according to weight percentage;
[0033] ③Smelting molten iron: heating the raw materials with good ratio to make it into molten iron at 1500℃~1550℃ and smelting;
[0034] ④ Spheroidization and inoculation: add nodulizer to the smelted molten iron for spheroidization, and at the same time add inoculant for inoculation in the bag;
[0035] ⑤ Pouring: The temperature of pouring molten iron in the sand-covered iron mold is controlled at 1350°C to 1450...
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Abstract
The invention provides a ductile iron casting, which comprises the following chemical components: 3.5-3.9% of C, 2.4-3.2% of Si, 0.4-0.5% of Mn, less than or equal to 0.1% of P, less than or equal to 0.03% of S, less than 0.04% of Ti, 0.030-0.045% of Mg residual, 0.005-0.015% of Re residual, and the balance Fe. The manufacturing method consists of: conducting inspection and compounding in front of a furnace, then carrying out smelting, nodularization, and then performing aftertreatment, like heat treatment, shot blasting, polishing and machining, etc., thus obtaining an output product. Twice inoculation achieves a good effect. The production process is simple, and has obviously decreased energy consumption, thus being suitable for mass production. While ensuring good comprehensive mechanical properties of ductile iron, the method saves adding of copper, tin and other precious metals. In addition, the ratio of raw materials is simple, and magnesium and rare earth are both controlled within the required range, so that the graphitization level of the ductile iron body molded by casting is stabilized at 1-2.
Description
technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a ductile iron casting and a manufacturing method thereof. Background technique [0002] Ductile cast iron is a high-strength cast iron material developed in the 1950s. Its metallographic structure is composed of graphite balls and matrix structure. The height is divided into 6 grades, the nodularization rate is high, the plasticity and toughness of the ductile iron are good; the graphite balls are divided into six grades according to the size, reducing the graphite ball diameter and increasing the number of graphite balls per unit area can significantly improve the ductile iron. strength, plasticity and toughness. The matrix structure of ductile iron mainly includes ferrite, pearlite, austenite, bainite, martensite, cementite and phosphorus eutectic, among which cementite and phosphorus eutectic can strongly reduce the Excellent tensile strength, elongation and imp...
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