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Preparation method of nodular cast iron

A technology for ductile iron and molten iron, which is applied in the field of ductile iron preparation, can solve the problems of lowering performance of castings, slow cooling speed, and distortion of graphite in the center of castings, and achieves the effects of low production cost, short production cycle and stable quality.

Active Publication Date: 2012-03-21
宁波康发铸造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the thick section and slow cooling rate of existing large-section nodular cast iron, graphite distortion occurs in the center of the casting, and the number of nodular graphite decreases, resulting in a decline in casting performance. In severe cases, the casting may even be scrapped

Method used

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  • Preparation method of nodular cast iron
  • Preparation method of nodular cast iron
  • Preparation method of nodular cast iron

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Embodiment Construction

[0019] The percentage by weight of the nodular cast iron to be prepared in the present invention is: C: 3.75%-3.90%, Si: 1.8%-2.3%, Mn: 0.1%-0.2%, P: 0.04%-0.05%, S<0.015%, Re: 0.02%-0.026%, Mg: 0.04%-0.06%, the balance is Fe and unavoidable trace elements.

[0020] The above-mentioned preparation method of nodular cast iron includes a raw material smelting step, a spheroidizing treatment step and an inoculation treatment step.

[0021] (1) Raw material smelting

[0022] Each element in the ductile iron of the present invention is taken from coke, limestone, fresh iron, returned furnace iron, scrap steel and ferroalloy, and the mass ratio of each raw material is: 1: 0.3: (6.0-6.25): (1.8-2.2): 1.7: (0.04 -0.015). After weighing the raw materials, put the above-mentioned raw materials into the cupola. The cupola is preheated for 20 minutes and then the blast smelting starts. The molten iron temperature is 1450°C-1500°C. After the raw material is smelted into a liquid state, ...

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Abstract

The invention discloses a preparation method of nodular cast iron, belonging to the technical field of metallurgy manufacture, and solving the defects in the prior art that the preparation flow cycle of the nodular cast iron is long, and the mechanical performance of the prepared nodular cast iron can not meet requirements. The preparation method of the nodular cast iron comprises the following steps: material smelting, spheroidization and a first time of inoculation, a second time of inoculation, and a third time of inoculation. The preparation method of the nodular cast iron is low in production cost and short in production cycle, and does not need thermal treatment. The produced nodular cast iron has stable quality and high toughness, and is especially suitable for castings of machine dies with high impact force and high strength.

Description

technical field [0001] The invention relates to the technical field of cast iron smelting, in particular to a preparation method of nodular cast iron. Background technique [0002] Ductile cast iron is spheroidized graphite obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially improves plasticity and toughness, thereby obtaining higher strength than carbon steel. Ductile cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some complex stress, strength, toughness, and wear resistance. Parts with high performance requirements. [0003] Large-section ductile cast iron refers to the ductile cast iron used for ductile castings with a template thickness greater than 100 mm. It is mainly used in some high-impact, high-strength machine mold ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C21C1/10C22C37/04
Inventor 俞光杰李建国刘锐
Owner 宁波康发铸造有限公司
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