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As-cast high-toughness ferrite nodular iron and production method thereof

A technology of nodular cast iron and production method, which is applied to as-cast high-toughness ferritic nodular cast iron and its production field, can solve the problems of slow cooling rate, reduction in the number of graphite nodules, inoculation and recession, etc., and achieves short production cycle and low production cost. , the effect of stable quality

Inactive Publication Date: 2011-06-22
衡阳中钢衡重铸锻有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, due to the slow cooling rate of thick-walled ductile iron parts, a series of problems are prone to occur during casting, such as spheroidization, inoculation decline, coarse structure, reduction in the number of graphite balls, and the formation of fragmented graphite

Method used

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  • As-cast high-toughness ferrite nodular iron and production method thereof
  • As-cast high-toughness ferrite nodular iron and production method thereof

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Embodiment Construction

[0037] An as-cast high-toughness ferritic ductile iron, the composition of which is: C: 3.75-3.85% by mass, Si: 1.8-2.2% by mass, Mn: 0.08-0.3% by mass, P:<0.03% by mass, S:< 0.015% by mass, RE: 0.015-0.035% by mass, Mg: 0.04-0.06% by mass, and the balance is iron and unavoidable trace impurities.

[0038] A production method of as-cast high-toughness ferritic nodular cast iron, which comprises the following process steps:

[0039] 1. Melting

[0040] A. Take the furnace charge. The composition ratio of the furnace charge is: 67.5-71.5% by mass of pig iron, 27.75-31.75% by mass of steel scrap, and 0.73-0.75% of graphite recarburizer. The best ratio is 69.26% by mass of pig iron and 30% by mass of steel scrap , graphite recarburizer 0.74% by mass;

[0041] B. Add pig iron to the intermediate frequency induction furnace to start the furnace for smelting. After the pig iron is melted, add scrap steel and graphite recarburizer. The temperature of the molten iron in the furnace i...

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Abstract

The invention discloses as-cast high-toughness ferrite nodular iron, which comprises the following components: 3.75 to 3.85 mass percent of C, 1.8 to 2.2 mass percent of Si, 0.08 to 0.3 mass percent of Mn, less than 0.03 mass percent of P, less than 0.015 mass percent of S, 0.015 to 0.035 mass percent of RE, 0.04 to 0.06 mass percent of Mg and the balance of iron and inevitable micro impurities. The as-cast high-toughness ferrite nodular iron has high toughness, high ferrite content, high spheroidization and high low-temperature performance and is particularly suitable for making wind and power castings. The invention also discloses a production method of the nodular iron, which comprises the following steps: smelting pig iron, waste steel and graphite carburetant; and adding a nodulizer,a pretreating agent and an inoculant for before-furnace treatment. The product cost is low and the production period is short.

Description

technical field [0001] The invention relates to a cast iron material and a production method thereof, in particular to an as-cast high-toughness ferritic nodular cast iron and a production method thereof. Background technique [0002] The traditional high-toughness ductile iron material is obtained through a large amount of pre-furnace inoculation treatment under the condition of low silicon and low manganese in the original molten iron and a high final silicon content. However, the performance of the test rod is not stable, and it often requires graphitization annealing treatment. This material is used to make wind power castings. Wind power casting materials have low temperature performance requirements, and high silicon content seriously affects their performance. Wind power castings are thick-walled parts, and most of the materials are EN-GJS-400-18LI-LT and EN-GJS-350-22U-LT of EN1563 standard. It is required that the amount of ferrite in the structure is >90%, and ...

Claims

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Application Information

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IPC IPC(8): C21C1/10C22C37/10
Inventor 谢驰中杜红星凌志罗佳范强国
Owner 衡阳中钢衡重铸锻有限公司
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