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Thin-wall austenite nodular cast iron impeller production technology

A nodular cast iron, production process technology, applied in the field of thin-walled austenitic nodular cast iron impeller production process, can solve the problems of poor flow performance of nodular cast iron, low production efficiency, difficult sand cleaning of castings, etc., and achieve excellent corrosion resistance and durability Abrasiveness and the effect of improving production efficiency

Active Publication Date: 2012-10-17
TIANJIN JINSHENGDA GASOLINEEUM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of producing oil pump impellers, the thickness of some blades is only 1mm, coupled with the poor fluidity of ductile iron itself, the original traditional process can only obtain sound castings by using the investment casting process, and the investment casting production process is complex and the castings are clear. Sand is difficult and production efficiency is very low

Method used

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  • Thin-wall austenite nodular cast iron impeller production technology
  • Thin-wall austenite nodular cast iron impeller production technology
  • Thin-wall austenite nodular cast iron impeller production technology

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A. Melt cast iron in an intermediate frequency electric furnace, and use 75 ferrosilicon, strontium ferrosilicon, electrolytic nickel, electrolytic copper, 65 ferromanganese and 60 ferrochrome to adjust the chemical composition. Please refer to Table 1 for the chemical composition list;

[0021] Table 1:

[0022]

[0023] B. Add nickel-containing FeSiRe2Mg6 to the molten iron in A and carry out spheroidization treatment, the addition is 11%, and the spheroidization treatment adopts the flushing method, and the treatment temperature is 162°C;

[0024] C. adopt 0.3% 75 ferrosilicon, 0.25% strontium ferrosilicon to carry out inoculation treatment to the molten iron of B step;

[0025] D. Pouring the molten iron in step C into the impeller mold with clay sand or coated sand, and adopting 75 ferrosilicon to incubate with the flow during casting.

[0026] E. After cooling at room temperature until the molten metal is solidified, take out the casting and clean it up to ma...

Embodiment 2

[0028] A. Melt cast iron in an intermediate frequency electric furnace, and use 75 ferrosilicon, strontium ferrosilicon, electrolytic nickel, electrolytic copper, 65 ferromanganese and 60 ferrochrome to adjust the chemical composition. Please refer to Table 1 for the chemical composition list;

[0029] Table 1:

[0030]

[0031] B. Add nickel-containing FeSiRe2Mg6 to the molten iron in A and carry out spheroidization treatment, the addition is 11%, and the spheroidization treatment adopts the flushing method, and the treatment temperature is 1650;

[0032] C. adopt 0.3% 75 ferrosilicon, 0.25% strontium ferrosilicon to carry out inoculation treatment to the molten iron of B step;

[0033] D. Pouring the molten iron in step C into the impeller mold with clay sand or coated sand, and adopting 75 ferrosilicon to incubate with the flow during casting.

[0034] E. After cooling at room temperature until the molten metal is solidified, take out the casting and clean it up to mak...

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Abstract

The invention relates to a thin-wall austenite nodular cast iron impeller production technology. The technology comprises the steps that: A, cast iron is smelted in a medium-frequency electric furnace; and the chemical composition of the molten iron is regulated by using 75 ferrosilicon, strontium ferrosilicon, electrolytic nickel, electrolytic copper, 65 ferromanganese, and 60 ferrochromium; B, a nodulizing process is carried out by adding nickel-containing FeSiRe2Mg6 into the molten iron obtained in the step A, wherein a pouring-in method is adopted, and the processing temperature is 1620-1650; C, an inoculation treatment is carried out upon the molten iron obtained in the step B by using 0.3% of 75 ferrosilicon and 0.25% of strontium ferrosilicon; D, the molten iron obtained in the step C is cast into an impeller casting mold employing clay-bonded sand or pre-coated sand, and stream inoculation is carried out by using 75 ferrosilicon during casting; and E, the materials are cooled in room temperature until the molten metal is solidified, and the casting is fetched and cleaned, such that the austenite nodular cast iron impeller with corrosion resistance and wear resistance is obtained. According to the invention, through the arrangements on the chemical composition and the casting process, austenite nodular cast iron petroleum pump impellers can be produced in batches stably, energy can be saved, emission can be reduced, the production efficiency can be improved, and the products are provided with excellent corrosion resistance and wear resistance.

Description

technical field [0001] The invention relates to a process for preparing an impeller of a petroleum pump, in particular to a process for producing a thin-walled austenitic nodular cast iron impeller. Background technique [0002] Austenitic ductile iron has good corrosion resistance and wear resistance, and is widely used in petrochemical, seawater desalination and other industrial sectors. [0003] In the process of producing oil pump impellers, the thickness of some blades is only 1mm, coupled with the poor fluidity of ductile iron itself, the original traditional process can only obtain sound castings by using investment casting process, and the production process of investment casting is complicated, and the castings are clear Sand is difficult and the production efficiency is very low. Contents of the invention [0004] The invention provides a thin-walled austenitic nodular cast iron impeller production process with simplified production process and high production e...

Claims

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Application Information

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IPC IPC(8): C22C37/08C22C33/10
Inventor 王福军
Owner TIANJIN JINSHENGDA GASOLINEEUM MACHINERY
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