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Spheroidal graphite cast iron spheroidizing method

A technology of spheroidizing treatment and nodular cast iron, which is applied in the field of spheroidizing treatment of pouring into the ladle method, can solve the problems of low absorption rate of effective elements, violent reaction, etc., improve the production environment, reduce production costs, and solve the problems of molten iron splashing Effect

Inactive Publication Date: 2013-06-12
TIANJIN WANLU LTD CO OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a nodular cast iron spheroidization treatment method, which is a spheroidization treatment method in which the spheroidizer is put into the spheroidization reaction chamber built by masonry in the spheroidization bag and rushed into the bag to solve the problem of spheroidization. The problem of severe reaction and low absorption rate of effective elements during spheroidization treatment in the bag, precise control of spheroidization reaction time, improvement of product quality, reduction of production costs, easy operation, full play and utilization of resources, significantly improved the production process of spheroidizers And the production environment of the use process

Method used

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  • Spheroidal graphite cast iron spheroidizing method
  • Spheroidal graphite cast iron spheroidizing method
  • Spheroidal graphite cast iron spheroidizing method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: Carried out under cold wind cupola smelting conditions, using the integral rare earth magnesium ferrosilicon nodulizer 2 with outer lining square steel pipe shown in the accompanying drawing to be loaded into the reaction chamber, covered by the first wedge-shaped refractory brick 3 and the second Wedge-shaped refractory bricks with 4 closed feed ports are fixed at the bottom of the molten iron ladle for spheroidization treatment. The weight of molten iron per ladle is 1000kg. The red hot ladle is used for continuous operation. The temperature of the molten iron in the tapping trough is 1490°C, and the sulfur content of the original molten iron is 0.062%. , excluding the overall rare earth magnesium ferrosilicon nodulizer containing Mg 15%, RE 2% and Si 58% in the outer lined square steel pipe. 1.1% of the weight of molten iron, 0.4% is added to the 72SiFe inoculant bag, iron filings and perlite are not covered during the spheroidization reaction, and the a...

Embodiment 2

[0036]Example 2: Carried out under the conditions of medium frequency electric furnace smelting, using the integral rare earth magnesium ferrosilicon nodularizing agent without outer lining steel pipe to be loaded into the reaction chamber, and the feeding port is closed and fixed by the first wedge-shaped refractory brick 3 and the second wedge-shaped refractory brick 4 The spheroidizing treatment is carried out at the bottom of the molten iron ladle. The weight of each ladle is 1000kg. The temperature of the molten iron from the electric furnace is 1588°C. The sulfur content of the original molten iron is 0.025%. Containing 14.5% of Mg, 1% of RE and 58% of Si, the weight of the overall rare earth magnesium silicon ferrosilicon nodulizer added accounts for 0.55% of the weight of the molten iron to be processed, and 0.35% of 72SiFe inoculant is added in the bag, and the nodularization reaction is completed. After the slag, silicon-barium inoculant with a particle size of ≤5mm i...

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Abstract

The invention relates to a spheroidizing method for producing spheroidal graphite cast iron. The spheroidizing method comprises the stepof placing an integral rare earth magnesium-silicon-iron spheroidizing agent containing less than or equal to 20% of Mg, less than or equal to 65% of Si and less than or equal to 3% into a spheroidizing reaction chamber constructed in a spheroidizing ladle and spheroidizing by adopting a ladle rushing-in method, wherein addition amount of the spheroidizing agent is only 0.4-8% of the weight of molten iron to be spheroidized, spheroidizing time is accurately controlled, the molten iron is slightly cooled in a spheroidizing process and a pouring process, absorption rate of Mg, RE and Si after spheroidizing is high after spheroidizing, no spheroidizing attenuation is caused within 15 minutes after a spheroidizing reaction is finished, production environments of a preparation process and a using process of the spheroidizing agent are improved, production cost is obviously reduced, and product quality is improved. Compared with the traditional rare earth magnesium-silicon-iron spheroidizing agent with rare earth (RE) element content of 2-8%, the spheroidizing method provided by the invention has the advantage that usage amount of the rare earth element is reduced by 50-75%.

Description

technical field [0001] The invention relates to a spheroidizing treatment method for producing nodular cast iron, more specifically to a spheroidizing treatment method in which a spheroidizing agent is placed in a spheroidizing reaction chamber built by masonry in a spheroidizing bag and carried out by flushing into the bag. Background technique [0002] Rare earth magnesium ferrosilicon alloys are widely used as nodularizers in enterprises producing ductile iron castings. Rare earth magnesium ferrosilicon alloy nodulizer is currently the largest nodulizer at home and abroad, but in its traditional production process, it consumes a lot of energy, has large melting loss, and causes serious environmental pollution. Due to the low absorption rate of magnesium, the traditional nodulizer The amount added is larger. For a long time, technical personnel at home and abroad have made unremitting efforts to study the spheroidization treatment technology of the in-package method and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10B22D1/00
Inventor 刘年路刘昌晨
Owner TIANJIN WANLU LTD CO OF SCI & TECH
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