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Nodular cast iron winding drum high in strength and ductility and preparation method thereof

A ductile iron, high-strength technology, applied in the field of ductile iron materials, can solve the problems of low ductility of castings, achieve the effects of low raw material and production costs, improve strength, and delay spheroidization recession

Active Publication Date: 2016-04-20
SHANDONG HUIFENG CASTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The matrix of the casting contains a certain proportion of pearlite structure, so the ductility of the casting is low

Method used

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  • Nodular cast iron winding drum high in strength and ductility and preparation method thereof
  • Nodular cast iron winding drum high in strength and ductility and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0041] The present invention also provides a kind of preparation method of above-mentioned nodular cast iron reel, comprises the following steps:

[0042] 1) Smelting: heating and melting the mixed material of pig iron, scrap steel, recycled material, ferrosilicon, ferromolybdenum and metallic nickel into molten iron;

[0043] When the temperature of the molten iron reaches 1490°C-1520°C, the composition of the molten iron is adjusted in front of the furnace so that the molten iron includes the following components by weight percentage: 3.0%-3.3% C; 3.8%-4.2% Si; Mn<0.3%; S<0.02 %; P<0.03%; 0.2%-0.3% Mo; 0.12%-0.15% Ni; the balance is Fe and unavoidable impurities;

[0044] When the composition of molten iron is qualified, remove the slag;

[0045] Then, keep warm for 3 minutes to 5 minutes, and then prepare the molten iron to come out of the furnace.

[0046] 2) Spheroidization treatment: place the low-rare-earth magnesium alloy nodulizer on the bottom of the ladle, cover i...

Embodiment 1

[0057] Using a 3-ton intermediate frequency electric furnace to smelt molten iron includes the following steps:

[0058] 1) Smelting: heating and melting the mixed material of pig iron, scrap steel, recycled material, ferrosilicon, ferromolybdenum and metallic nickel into molten iron;

[0059] The weight percent of the added pig iron is 40%, the weight percent of steel scrap is 27.42%, the weight percent of returned charge is 30%, the weight percent of ferrosilicon is 2.0% and the weight percent of silicon in the described ferrosilicon is 75%, The weight percentage of molybdenum iron is 0.4%, and the weight percentage of molybdenum in said molybdenum iron is 60%, and the weight percentage of metal nickel is 0.18%, and its purity is 99.90%.

[0060] When the temperature of the molten iron reaches 1495°C, adjust the composition of the molten iron in front of the furnace so that the molten iron includes the following components in weight percentage: 3.0% C; 4.2% Si; Mn<0.3%; S<0....

Embodiment 2

[0074] Using a 3-ton intermediate frequency electric furnace to smelt molten iron includes the following steps:

[0075]1) Smelting: heating and melting the mixed material of pig iron, scrap steel, recycled material, ferrosilicon, ferromolybdenum and metallic nickel into molten iron;

[0076] The weight percent of the added pig iron is 40%, the weight percent of steel scrap is 25%, the weight percent of returned materials is 32.75%, the weight percent of ferrosilicon is 1.6% and the weight percent of silicon in the described ferrosilicon is 75%, The weight percentage of molybdenum iron is 0.5%, and the weight percentage of molybdenum in the said molybdenum iron is 60%, and the weight percentage of metallic nickel is 0.15%, and its purity is 99.90%.

[0077] When the temperature of the molten iron reaches 1505°C, adjust the composition of the molten iron in front of the furnace so that the molten iron includes the following components in weight percentage: 3.3% C; 3.8% Si; Mn<0...

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Abstract

The invention discloses a nodular cast iron winding drum high in strength and ductility. Nodular cast iron is composed of, by weight, 3.0-3.3% of C, 3.8-4.2% of Si, Mn smaller than 0.3%, 0.03-0.05% of Mg, 0.01-0.025% of RE, S smaller than 0.02%, P smaller than 0.03%, 0.2-0.3% of Mo, 0.12-0.15% of Ni, 0.003-0.010% of Ca, 0.005-0.010% of Ba, Bi smaller than or equal to 0.003% and the balance Fe and inevitable impurities, wherein the total content of Ca and Ba is greater than or equal to 0.010% and smaller than or equal to 0.020%. The nodular cast iron winding drum is high in strength and ductility and can be used for large or ultra-large engineering equipment. The invention further discloses a preparation method for the nodular cast iron winding drum.

Description

technical field [0001] The invention relates to the technical field of nodular cast iron materials, in particular to a high-strength and high-ductility nodular cast iron reel and a preparation method thereof. Background technique [0002] The reel is one of the key components of large-scale lifting equipment, rotary drilling and hoisting reducer. Since the load-bearing steel wire rope is directly wound on the reel, the reel directly bears the lifting load. The safe operation of the drilling and hoisting reducer has a vital impact. As the development of modern engineering tends to be large-scale, the application of large-scale or super-large lifting equipment, drilling equipment and hoisting reducers in the construction machinery industry is becoming more and more extensive, and the lifting weight and lift are greatly increased. For example: the hoisting weight of super-large hoisting equipment has reached several thousand tons; the lift of super-large hoist has reached hund...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/10C22C33/10B22D1/00C21D1/30
CPCB22D1/00C21D1/30C22C33/10C22C37/04C22C37/10Y02P10/20
Inventor 刘宪民郭经庆刘明亮刘庆坤周长猛巩传海
Owner SHANDONG HUIFENG CASTING TECH
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