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Nodular cast iron and preparation method thereof

A technology for ductile iron and molten iron, applied in the field of ductile iron and its preparation, can solve the problems of limiting the application of ductile iron and the like

Pending Publication Date: 2022-02-18
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the development of science and technology, it is required that the material of lightweight ductile iron parts should be within 1.0×10 7 The rotating bending fatigue under the second life time can reach 330MPa and above. The ductile iron produced by traditional technology cannot meet this requirement, which greatly limits the application of ductile iron.

Method used

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  • Nodular cast iron and preparation method thereof
  • Nodular cast iron and preparation method thereof
  • Nodular cast iron and preparation method thereof

Examples

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preparation example Construction

[0039] An embodiment of the present invention also provides a method for preparing nodular cast iron, including the following steps S10-S40.

[0040] Step S10, providing raw materials for preparation and smelting into raw molten iron.

[0041] Step S20, performing desulfurization treatment on the original molten iron obtained in step S10 to obtain desulfurized molten iron.

[0042] Step S30, the desulfurized molten iron obtained in step S20 is spheroidized under the action of a rare earth ferrosilicon-magnesium alloy spheroidizer and a ferrosilicon inoculant; the molten iron after spheroidization is obtained; the quality of the ferrosilicon inoculant is 0.5wt% to 0.7wt% of the mass of molten iron; the mass of the rare earth silicon-iron-magnesium alloy nodulizer is 1.1wt% to 1.2wt% of the mass of the original molten iron;

[0043] The molten iron after spheroidization includes the following components: 3.5wt% to 3.9wt% C, 2.5wt% to 2.8wt% Si, 0.7wt% to 0.85wt% Cu, 0.001wt% to...

Embodiment 1

[0075] (1) Equipped raw materials: provide iron materials including high-purity pig iron, scrap steel and returned iron, antimony (grade SB-3), electrolytic copper, rare earth silicon-iron-magnesium alloy, 75SiFe. The raw materials are then smelted into raw molten iron, the composition of which is shown in Table 1.

[0076] (2) Desulfurization process: First, heat the desulfurization ladle thoroughly until the temperature inside the ladle is higher than 800°C, pour the original molten iron, hang the desulfurization stirring device, cover the mouth of the ladle, and cover it tightly. Then add a deep desulfurization agent (CaO-based desulfurization powder) from the feeding hole of the desulfurization stirring device, stir for 5 minutes, then lift the desulfurization stirring device, remove the slag on the liquid surface of the molten iron, and use the pouring spectrum analysis test block to analyze the sulfur content , the sulfur content of the molten iron is controlled to be le...

Embodiment 2

[0083] Example 2 is basically the same as Example 1, except that the composition of the original molten iron is different, as shown in Table 1. The composition of the prepared nodular cast iron is shown in Table 3.

[0084] Other processing parameters are identical with embodiment 1.

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Abstract

The invention relates to nodular cast iron and a preparation method thereof. The nodular cast iron comprises the following components in percentage by mass: 3.5 wt%-3.9 wt% of C, 2.5 wt%-2.8 wt% of Si, 0.7 wt%-0.85 wt% of Cu, 0.001 wt%-0.01 wt% of Sb, 0.03 wt%-0.06 wt% of Mg, 0.01 wt%-0.03 wt% of RE, less than or equal to 0.3 wt% of Mn, less than or equal to 0.03 wt% of P, less than or equal to 0.02 wt% of S and the balance of Fe. The nodular cast iron contains the components in a specific ratio, and all the components are coordinated and matched, so that the anti-fatigue performance of the nodular cast iron is improved, and the nodular cast iron has a high nodulizing grade and a large number of pearlites.

Description

technical field [0001] The invention relates to the technical field of alloy preparation, in particular to a ductile cast iron and a preparation method thereof. Background technique [0002] Since the early 1950s, nodular cast iron materials have been gradually popularized and applied due to their good comprehensive mechanical properties and process properties. Ductile iron has the characteristics of high strength, excellent impact resistance and good toughness. Compared with forged steel, it has great advantages in plasticity, corrosion resistance, oxidation resistance, heat resistance, crack resistance, vibration reduction and cost. It will soon replace forged steel as the main application material for mechanical components such as crankshafts. [0003] The fatigue resistance of ductile iron is a key parameter in the design and casting of mechanical components. Fatigue resistance is used to express the damage and failure of materials under cyclic loading. The Geneva Int...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C37/10C21C1/02C21C1/10C21C7/064C21C7/072C22C33/10
CPCC22C37/04C22C37/10C22C33/10C21C1/105C21C1/02C21C7/064C21C7/072
Inventor 李伟乔小兵张鑫何铭雪吴晓涛许长贺张建振王学双齐飞李骏王保男
Owner FAW JIEFANG AUTOMOTIVE CO
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