Big section ferrite magnesium iron and preparation technique thereof

A ferrite and large-section technology, which is applied to the field of preparation technology of large-section ferrite ductile iron, can solve problems such as inapplicability, and achieve the effect that the preparation method is simple and feasible

Active Publication Date: 2009-08-05
JIANGSU FAW FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been proved by experiments that when Sb is added at 0.006% to 0.008%, because Sb can increase the number of pearlite in the matrix structure of ductil

Method used

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  • Big section ferrite magnesium iron and preparation technique thereof
  • Big section ferrite magnesium iron and preparation technique thereof
  • Big section ferrite magnesium iron and preparation technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] After 10 tons of molten iron is desulfurized in the cupola, it is added to the electric furnace through the transfer ladle to raise the temperature, and the temperature of the molten iron is raised to 1450 ° C to exit the electric furnace, and the spheroidization and inoculation are carried out in the ladle;

[0020] Spheroidization and inoculation treatment: pour a total of 5 tons of heated molten iron into the ladle for spheroidization and inoculation treatment. The weight of the nodulizer is 1.1% of the weight of molten iron, and the addition of the nodulizer is 55kg. The weight percentage of Re in the nodulizer is 0.6%, which is 330 grams, and the weight percentage of Mg is 6.0%. 3.3kg in total, the weight percentage of Si is 40.0%, 22kg in total, and the rest is iron. According to the weight of molten iron poured in, Sb powder with 0.0015% of the weight of molten iron is weighed and covered on the surface of the nodulizer, and the Sb powder is 75 grams , cover the ...

Embodiment 2

[0027] 10 tons of molten iron is desulfurized in the cupola and then added to the electric furnace to heat up through the transfer ladle. The temperature of the molten iron is raised to 1480°C and released from the furnace. Spheroidization and inoculation are carried out in the ladle;

[0028] Spheroidization and inoculation treatment: Pour 5 tons of molten iron after heating and carburization treatment into the ladle for spheroidization and inoculation treatment. The temperature of the spheroidization reaction is 1430°C. Parts, the weight of the nodulizer is 1.3% of the weight of molten iron, 65kg, the weight percentage of Re in the nodulizer is 2.0%, 1.3kg, the weight percentage of Mg is 9.0%, 5.85 kg, the weight percentage of Si is 46.0%, 29.9kg in total, and the rest is iron. And take by weighing the Sb powder of molten iron weight 0.0030% according to the molten iron weight poured in and cover on the nodulizer surface, Sb powder counts 150 grams, covers the 75SiFe of molt...

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Abstract

The invention discloses large cross-section ferritic spheroidal graphite cast iron and also a preparation process thereof. According to the technical schemes, the large cross-section ferritic spheroidal graphite cast iron contains the following components according to percentages by weight: 3.6-3.9 percent of C, 1.7-3.0 percent of Si, 0.1-0.4 percent of Mn, 0.035-0.050 percent of Mg, 0.002-0.004 percent of Sb, and impurity elements of P and S, wherein the content of P in the impurity elements is controlled to be less than or equal to 0.040 percent, the content of S in the impurity elements is controlled to be less than or equal to 0.015 percent, and the rest is iron. In the invention, the extension ratio and the impact value reach and exceed the standard requirement values; in addition, the tension strength and the yield strength can also be ensured to reach requirements, and the preparation method is simple and easy.

Description

technical field [0001] The invention discloses a large-section ferrite nodular iron, and also discloses a preparation process of the large-section ferrite nodular iron. Background technique [0002] Wind energy is a renewable energy and green energy. It is widely and maturely used in Europe. Since 2004, China has vigorously developed wind energy, and the country is vigorously supporting wind power projects. Large-scale wind power hubs are castings with thick and large cross-sections. Due to the slow cooling rate and long solidification time of thick and large-section ductile iron parts, graphite balls are prone to distortion, which greatly reduces the toughness and plasticity of ductile iron parts. Performance is used as the basis for judging the quality of materials. Now not only performance must meet the requirements, but also higher requirements for graphite morphology and matrix structure. This prompts us to improve graphite morphology and achieve performance through sm...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/12
Inventor 俞旭如周益中刘鑫苏敏王秋新李川度方怡蔡佳佳
Owner JIANGSU FAW FOUNDRY
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