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A method for improving graphite grade of thick and large section gray cast iron

A large-section, gray cast iron technology, applied in the grade field, can solve the problems of improving the graphite grade of thick and large-section gray cast iron, and does not use the thermal conductivity and heat storage coefficient of chrome ore sand, so as to overcome shrinkage defects, improve mechanical properties, and improve Effect of Graphite Grade

Active Publication Date: 2016-06-01
KOCEL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned prior art chrome ore is only used to overcome shrinkage defects in casting production, but there is no method for improving the graphite grade of thick and large cross-section gray cast iron by utilizing the higher thermal conductivity and heat storage coefficient of chrome ore

Method used

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  • A method for improving graphite grade of thick and large section gray cast iron
  • A method for improving graphite grade of thick and large section gray cast iron
  • A method for improving graphite grade of thick and large section gray cast iron

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Embodiment Construction

[0028] A method for improving the graphite grade of thick and large section gray cast iron, which comprises the following steps

[0029] a. Size selection of thick and large section castings:

[0030] Since castings with a wall thickness exceeding 60mm can be classified as thick and large-section castings, the size of the thick and large-section castings selected this time is 150mm*150mm*450mm.

[0031] b. Choice of cooling method: According to different cooling speeds, three cooling methods are selected: natural cooling, chrome ore sand cooling and direct cooling chilled iron cooling

[0032] Parameter comparison

main content

thermal conductivity

cooling rate

silica sand

silica

slow

slow

Chrome ore

Chromium trioxide

medium

medium

Direct cooling cold iron

Iron compounds

quick

quick

[0033] c. Material ratio: pig iron contains a large number of cores, and these cores have a great effect ...

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PUM

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Abstract

The invention relates to a method for improving grade of gray cast iron graphite and in particular relates to a method for improving grade of thick section gray cast iron graphite. The method comprises the following steps: selecting thick section castings, selecting cooling modes, proportioning materials, selecting the components, performing modification treatment, detecting the castings, analyzing the test results and obtaining the metallograph. According to the method provided by the invention, cooling of the casting is accelerated by utilizing high heat conductivity coefficient and heat storage coefficient of chrome ore, and the aim of improving the form / grade of the gray cast iron graphite is achieved, so that the mechanical properties of the castings are improved.

Description

technical field [0001] The invention relates to a method for improving graphite grade of gray cast iron, in particular to a method for improving graphite grade of thick and large section gray cast iron. Background technique [0002] The national standard has the following points for cast iron graphite grades: A-type fine flakes, B-type chrysanthemums, C-type thick flakes, D-type dots, E with directional dots, F spider-like or star-like. In the standard, graphite The longest (under 100 times, greater than or equal to 100mm is called stone length 100). The shortest graphite (under 100 times, less than 1.5mm, called stone length 1.5) is grade 8. The rating of graphite length has important practical significance for castings. Because Graphite is equivalent to crack defects in castings. The longer the crack. The breaking stress is smaller. It shows that the performance of the casting is worse. [0003] The mechanical properties of gray cast iron are related to the structure o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D5/02
CPCY02P10/20
Inventor 孙升张守全苏少静周文军王洪涛杨万虎陶涛周杰
Owner KOCEL EQUIP
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