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Large-cross-section nodular cast iron

A ductile iron, large-section technology, applied in the field of cast iron materials, can solve the problems of slow cooling speed, reduction of ductile number, and distortion of graphite in the center of castings

Active Publication Date: 2012-04-04
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

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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  • Large-cross-section nodular cast iron

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Experimental program
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Effect test

Embodiment 1

[0016] The mass percentages of large section ductile iron in this embodiment are: C: 3.5%, Si: 1.8%, Mn: 0.1%, P: 0.045%, S: 0.01%, Re: 0.018%, Mg: 0.05%, Cu: 0.5%, the balance is Fe and unavoidable trace elements.

Embodiment 2

[0018] The mass percent of large section ductile iron in this embodiment is: C: 3.6%, Si: 1.85%, Mn: 0.15%, P: 0.048%, S: 0.01%, Re: 0.019%, Mg: 0.052%, Cu: 0.5%, the balance is Fe and unavoidable trace elements.

Embodiment 3

[0020] The mass percent of large section ductile iron in this embodiment is: C: 3.7%, Si: 1.9%, Mn: 0.2%, P: 0.05%, S: 0.015%, Re: 0.02%, Mg: 0.055%, Cu: 0.5%, the balance is Fe and unavoidable trace elements.

[0021] Among the constituent elements of ductile iron, C, Si, P, Mn, and S are the five elements that are often present in ductile iron. C is the basic constituent element of ductile iron. Increasing the carbon content can reduce the volume and area of ​​shrinkage porosity and make the casting dense. However, if the carbon content is too high, the effect of reducing shrinkage porosity is not obvious, but serious graphite floating occurs, and the amount of residual Mg required to ensure the spheroidization of graphite also increases.

[0022] Si element can reduce the solubility of carbon in liquid and solid iron, and promote the precipitation of graphite. It is an element that promotes graphitization. Therefore, increasing the amount of silicon will increase the amoun...

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Abstract

The invention discloses large-cross-section nodular cast iron, belonging to the technical field of cast iron metallurgy and overcoming the defect that the nodular cast iron in the prior art cannot meet requirements of castings of high-impact machine dies due to poorer mechanical property. The large-cross-section nodular cast iron disclosed by the invention consists of the following components in percentage by mass: 3.5-3.7 percent of C, 1.8-1.9 percent of Si, 0.1-0.2 percent of Mn, 0.045-0.05 percent of P, 0.01-0.015 percent of S, 0.018-0.02 percent of Re, 0.05-0.055 percent of Mg, 0.5 percent of Cu and the balance of Fe and inevitable trace elements. The large-cross-section nodular cast iron has the advantages of high tenacity and higher ferrite quantity and nodularization ratio and is particularly suitable for various castings of high-strength and high-impact machine dies.

Description

technical field [0001] The invention relates to the technical field of cast iron materials, in particular to a large-section ductile 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. Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. [0003] Large-section ductile cast iron refers to the ductile cast iron used for ductile castings with ...

Claims

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Application Information

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IPC IPC(8): C22C37/04
Inventor 俞光杰李建国刘锐
Owner 宁波康发铸造有限公司