Method for preparing low-temperature-resistant corrosion-resistant wind-power spherulitic graphite cast iron

A nodular cast iron, corrosion-resistant technology, applied in the direction of improving process efficiency, etc., can solve the problems of poor impact toughness and corrosion resistance, achieve the effects of reducing corrosion current, high thermodynamic stability, and improving corrosion resistance

Inactive Publication Date: 2013-01-09
齐齐哈尔市精铸良铸造有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the technical problem of poor impact toughness and corrosion resistance of the existing nodular cast iron

Method used

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  • Method for preparing low-temperature-resistant corrosion-resistant wind-power spherulitic graphite cast iron
  • Method for preparing low-temperature-resistant corrosion-resistant wind-power spherulitic graphite cast iron
  • Method for preparing low-temperature-resistant corrosion-resistant wind-power spherulitic graphite cast iron

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specific Embodiment approach 1

[0013] Embodiment 1: A method for preparing a low-temperature-resistant and corrosion-resistant wind power nodular cast iron according to this embodiment is carried out in the following steps:

[0014] 1. Smelting molten iron: First, the mass parts of Q10 pig iron and scrap steel are 60~80 and 20~40, weigh Q10 pig iron and scrap steel, and then according to the mass of recarburizer for ball milling cast iron and the total mass of Q10 pig iron and scrap steel The ratio is (3~5): 100, according to the ratio of the mass of nickel plate to the total mass of Q10 pig iron and steel scrap is (1~1.5): 100, weigh the recarburizer and nickel plate for ball milled cast iron, and then weigh Add the recarburizer and nickel plate for Q10 pig iron, steel scrap, and ball-milled cast iron into the intermediate frequency furnace, raise the temperature to 1500~1550°C, let it stand for 2~4 minutes, and take it out of the furnace to obtain molten iron;

[0015] 2. Spheroidization and inoculation t...

specific Embodiment approach 2

[0018] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: in step 1, the total amount of impurities in Q10 pig iron ∑T≤0.1%, the components in scrap steel and the mass fraction of each component are: C: 0.17%~0.21% , S: 0.012%~0.016%, P: 0.020%~0.024%, Mn: 0.26%~0.30%, Si: 0.30%~0.40%, and other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0019] Specific embodiment three: what this embodiment is different from specific embodiment one or two is: the mass fraction of Q10 pig iron and steel scrap is 70 and 30 in the step 1, the quality of ball milling cast iron carburizer and the total amount of Q10 pig iron and steel scrap The mass ratio is 1:25, and the other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a method for preparing low-temperature-resistant corrosion-resistant wind-power spherulitic graphite cast iron, which relates to a method for preparing spherulitic graphite cast iron and solves technical problems of poor impact toughness and poor corrosion resistance on a condition that the current spherulitic graphite cast iron is at -60 degrees centigrade; a preparation method comprises the following steps: 1, smelting iron liquid; 2, balling and inoculation treatment; and 3, thermal treatment; the low-temperature-resistant corrosion-resistant wind-power spherulitic graphite cast iron is acquired through the preparation method disclosed by the invention; ferrite volume fraction reaches to 95-99%; the content of residual magnesium is within 0.042-0.050%; balling process is ensured not to generate recession; anti-extension strength is 370-385N/mm<2>; yield strength is 255-268N/mm<2>; extension ratio is 24-26%; rigidity is 156-164HBW; conventional performance index is relatively high; an impact value at -60 degrees centigrade is within 12-14J/cm<2>; impact toughness is relatively good; and the method can be applied in wind-power generation equipment.

Description

technical field [0001] The invention relates to a preparation method of nodular cast iron. Background technique [0002] With the rapid development of the wind power industry, there is an increasing demand for nodular cast iron with low temperature impact properties. According to the current growth trend, by 2020, China's total installed capacity will reach 100 million KW, which shows that the wind power industry is in the ascendant. Ductile iron is the main component of sharp power generation equipment. Since wind power generation equipment is mostly built in windy and low-temperature areas such as seasides and deserts, exposed to the air for a long time, the corrosion is serious and the service life is greatly shortened. Therefore, the quality requirements for ductile iron are higher. In addition to the conventional performance indicators of ductile iron, it is also required to have low temperature resistance and corrosion resistance, so as to improve the safety factor an...

Claims

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Application Information

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IPC IPC(8): C21C1/10C22C33/10C22C37/04
CPCY02P10/20
Inventor 鲍玉龙经喜东
Owner 齐齐哈尔市精铸良铸造有限责任公司
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