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Wear-resistant spheroidal graphite cast iron and preparation method thereof

A technology of ductile iron and molten iron, applied in the field of ductile iron and its preparation, can solve the problems of low hardness and poor wear resistance, and achieve the effect of high hardness and continuous distribution

Inactive Publication Date: 2010-04-28
WUHU JINMAO FLUID TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical properties of ferritic ductile iron are: the tensile strength is greater than 400Mpa, and the elongation is greater than 10%, but its hardness is low. Generally, the Brinell hardness of the as-cast state is 160-210 degrees, so the wear resistance is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation method of wear-resistant ductile iron:

[0020] 1. Ingredients process:

[0021] Weigh respectively 60% of the total weight of pig iron, 10% of No. 35 steel scrap, and 30% of the returned ductile iron.

[0022] 2. Melting process:

[0023] Use power frequency electric furnace for smelting, put the prepared raw materials into the furnace in order according to the ingredient list, melt them at 1500-1550 ℃, and carry out pre-furnace treatment;

[0024] 3. Pre-furnace treatment process:

[0025] The pre-furnace treatment process is as follows: pour the weighed nodulizer into one side of the embankment in the ladle, cover the nodulizer evenly with 60% of the total weight of the inoculant after pounding, and evenly sprinkle On the perlite, pour 70% of the total weight of molten iron first, and then pour in the rest of the molten iron after the spheroidization reaction is completed, and the remaining inoculant is rushed in with the flow to complete the spheroidi...

Embodiment 2

[0030] Preparation method of wear-resistant ductile iron:

[0031] Except 3. Pre-furnace treatment process:

[0032] The pre-furnace treatment process is as follows: pour the weighed nodulizer into one side of the embankment in the ladle, and evenly cover the nodulizer with 65% of the total weight of the inoculant after pounding tightly, and evenly sprinkle On the perlite, pour 75% of the total weight of molten iron first, and then pour in the rest of the molten iron after the spheroidizing reaction is completed, and the remaining inoculant will rush in with the flow to complete the spheroidization and inoculation treatment, and pour the triangle in front of the furnace. The test block is tested for spheroidization and inoculation results, and pouring can only be done after passing the test. The total weight of the inoculant accounts for 1.4% of the total weight of the molten iron.

[0033] The inoculant is a compound inoculant of silicon, strontium and bismuth, which contain...

Embodiment 3

[0037] Except 3. Pre-furnace treatment process:

[0038] The pre-furnace treatment process is as follows: pour the weighed nodulizer into one side of the embankment in the ladle, cover the nodulizer evenly with 70% of the total weight of the inoculant after pounding, and evenly sprinkle On the perlite, pour 80% of the total weight of molten iron first, and then pour in the rest of the molten iron after the spheroidization reaction is completed, and the remaining inoculant will rush in with the flow to complete the spheroidization and inoculation treatment, and pour the triangle in front of the furnace. The test block is tested for spheroidization and inoculation results, and pouring can only be done after passing the test. The total weight of the inoculant accounts for 1.5% of the total weight of the molten iron.

[0039] The inoculant is a compound inoculant of silicon, strontium and bismuth, which contains the following substances and percentages by weight: rare earth: 10%, ...

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Abstract

The invention discloses a wear-resistant spheroidal graphite cast iron and a prepration method thereof, and the cast ion contains the following chemical elements by weight percent: 3.5-3.7% of C; 2.8-3.3% of Si; not more than 0.5% of Mn; less than 0.02% of S; 0.15-0.4% of P and the balance of iron. The preparation method comprises the working procedures of material preparation, smelting and interrupted front treatment. Compared with the prior art, rare earth elements are utilized in the method for obtaining the spheroidal graphite cast iron with a binary iron phosphide eutectic structure, and the spheroidal graphite cast iron has uniform and continuous distribution and high hardness, and can not reduce the elongation rate of the cast ion, thereby being particularly applicable to delivering solid powder and granular substances.

Description

technical field [0001] The invention belongs to ductile cast iron and a preparation method thereof, in particular to wear-resistant nodular cast iron and a preparation method thereof. Background technique [0002] The current cast iron pipe fittings are mostly produced with ferritic ductile iron, which is produced with nodular iron pig iron or low sulfur, phosphorus content and pig iron with a small amount of scrap steel as raw materials. The mechanical properties of ferritic ductile iron are: the tensile strength is greater than 400Mpa, and the elongation is greater than 10%, but its hardness is low. Generally, the cast Brinell hardness is 160-210 degrees, so the wear resistance is poor. Contents of the invention [0003] The first technical problem to be solved by the present invention is to provide a wear-resistant nodular cast iron. [0004] The second technical problem to be solved by the present invention is the preparation method of the above-mentioned nodular cast...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/06C22C33/10
Inventor 孙述全季亮高峰
Owner WUHU JINMAO FLUID TECH CO LTD
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