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Novel as-cast 500-7 nodular cast iron

A ductile iron and as-cast technology, applied in the field of new as-cast 500-7 ductile iron, can solve the problems of affecting the production efficiency of iron mold sand coating, unfavorable mass production, low ferrite content, etc. Superior performance and the effect of increasing Si content

Inactive Publication Date: 2014-01-01
宁波康发铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of the as-cast 500-7 ductile iron obtained by this method is relatively good, the silicon content in this method is only 1.2-1.6%, the content is low, the graphite is fine but the quantity is small, the ferrite content is low, and the fluidity is slightly poor; And this method adopts the molding mode of iron mold covered with sand, and then utilizes iron mold to the rapid cooling of casting and the casting is annealed at the temperature above the eutectoid line after the casting is solidified in the mold cavity, the process is complicated, and its sand mold adopts during production The hot core box method requires a certain temperature and time for thermal curing, which consumes a lot of coal and affects the production efficiency of sand-coated iron molds, which is not conducive to mass production

Method used

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  • Novel as-cast 500-7 nodular cast iron
  • Novel as-cast 500-7 nodular cast iron
  • Novel as-cast 500-7 nodular cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0039] Table 4 Example 1-3 Inoculant mass percentage

[0040]

Embodiment 1

[0042] Weigh the coke, limestone, scrap, new iron, reheated iron and ferroalloy according to the mass percentage of the new as-cast 500-7 ductile iron in Example 1 of Table 1, and put them into the cupola in order. After preheating for 20 minutes, the molten iron temperature is Smelt at 1430℃. After smelting, detect the content of each element in the molten iron and adjust the content of each element until it meets the mass percentage of the new as-cast 500-7 ductile iron.

[0043] When the amount of molten iron in the molten iron ladle reaches the required level, add the first nodulizing agent and the second nodulating agent in Table 2 and Table 3 in Example 1 with a total mass of 1.7% of the mass of the molten iron on the side of the nodulizing ladle. The first spheroidizing agent accounts for 40% of the mass of all spheroidizing agents, the second spheroidizing agent accounts for 60% of the mass of all spheroidizing agents, the first spheroidizing agent is on the bottom, the se...

Embodiment 2

[0047] Weigh the coke, limestone, scrap, new iron, recycled iron, and ferroalloy according to the mass percentage of the new as-cast 500-7 ductile iron in Table 1 and Example 2, and put them into the cupola in order. After preheating for 25 minutes, the molten iron temperature is It is smelted at 1440°C. After smelting, the content of each element in the molten iron is detected and the content of each element is adjusted until it meets the mass percentage of the new as-cast 500-7 ductile iron.

[0048] When the amount of molten iron in the molten iron ladle reaches the required level, add the first nodulizing agent and the second nodulizing agent in Table 2 and Table 3 in Example 2 with a total mass of 1.75% of the mass of the molten iron on the side of the nodulizing ladle, wherein The first spheroidizing agent accounts for 40% of the mass of all spheroidizing agents, the second spheroidizing agent accounts for 60% of the mass of all spheroidizing agents, the first spheroidizing ...

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Abstract

The invention relates to a novel as-cast 500-7 nodular cast iron which comprises the following components in percentage by mass: 3.5-3.7% of C, 2.2-2.4% of Si, 0.1-0.2% of Mn, 0.045-0.05% of P, 0.01-0.015% of S, 0.018-0.02% of Re, 0.05-0.055% of Mg, 0.45-0.48% of Cu, and the balance of Fe and inevitable microelements. The elements come from coke, limestone, new pig iron, returning iron, electrolytic copper, steel scrap and iron alloy. The preparation method comprises the following steps: weighing the raw materials according to the percentage by mass of the novel as-cast 500-7 nodular cast iron, smelting, spheroidizing and inoculating three times to obtain the novel as-cast 500-7 nodular cast iron. The novel as-cast 500-7 nodular cast iron has the advantages of short production cycle, low pollution, low cost and high strength, and can obtain a ferrite / pearlite mixed matrix under as-cast conditions.

Description

Technical field [0001] The invention relates to the technical field of cast iron materials, in particular to a new as-cast 500-7 ductile iron. Background technique [0002] Nodular cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. Based on its excellent performance, it has been successfully used to cast some complex forces, strength, toughness, and wear resistance. Highly demanding parts. Nodular cast iron has rapidly developed into a cast iron material second only to gray cast iron and widely used. [0003] The use of as-cast technology to produce ductile iron can reduce equipment investment, simplify the production process, save man-hours, save energy, and avoid deformation and oxidation in the heat treatment process. Therefore, it is widely used in industrially developed countries and the domestic production of as-cast ductile iron is also increasing. improve. With the development of industry, peop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/10C22C33/08B22D1/00
Inventor 俞光杰李建国刘锐
Owner 宁波康发铸造有限公司
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