Method for preparing ADI nodular cast iron capable of resisting impact of low temperature of 40 DEG C below zero

A nodular cast iron, low-temperature impact technology, applied in the direction of improving process efficiency, etc., can solve the problem of low impact energy, achieve the effect of increasing the pressure in the bag, increasing the nucleation ability of graphite, and good absorption

Inactive Publication Date: 2015-07-29
齐齐哈尔市精铸良铸造有限责任公司
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Problems solved by technology

[0004] The invention solves the technical problem of low impact energy of the existing ADI ductile iron 900 / 650 / 09 in the high cold environment, and provides a preparation method of ADI ductile iron resistant to low temperature impact at -40°C

Method used

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  • Method for preparing ADI nodular cast iron capable of resisting impact of low temperature of 40 DEG C below zero
  • Method for preparing ADI nodular cast iron capable of resisting impact of low temperature of 40 DEG C below zero

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specific Embodiment approach 1

[0022] Embodiment 1: The preparation method of the ADI ductile iron resistant to -40°C low temperature impact of the present embodiment is carried out according to the following steps:

[0023] 1. Mix 70 parts of ductile pig iron Q10, 10 parts of low manganese scrap and 20 parts of return material according to the parts by mass, then heat up to 1510℃~1530℃ to melt, then add ductile iron Q10, low manganese scrap and return material with a total mass of 0.4 %~0.5% nickel plate is smelted, and after smelting, ductile pig iron Q10, low manganese scrap steel and red copper plate with a total mass of 1.1%~1.3% of the returned charge are added to smelt to obtain molten iron;

[0024] 2. Put the spheroidizing agent on the bottom side of the spheroidizing bag, and cover the 75% ferrosilicon inoculant on the spheroidizing agent. The inoculant is covered with a layer of low manganese scrap steel of the same quality as the inoculant, and the bag is covered. Cover, and then adopt the punch...

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Abstract

A method for preparing an ADI nodular cast iron capable of resisting the impact of a low temperature of 40 DEG C below zero relates to a method for preparing a low-temperature-resistant ADI ductile iron, and solves the technical problem that the impact energy of a conventional ADI ductile iron 900 / 650 / 09 in a high-cold environment is relatively low. The method comprises the following steps: firstly, melting ductile cast iron Q10, low-manganese steel scrap and returns and a proper amount of nickel plates and then adding nickel plates and sheet copper for smelting so as to obtain an iron liquid; secondly, performing spheroidization and inoculation treatment; thirdly, adding a desulfurization agent; fourthly, casting to obtain a sample; fifthly, preserving heat of the sample twice, then placing the sample into a nitrate medium, and discharging to obtain the ADI nodular cast iron. The ADI nodular cast iron has the yield strength of 660-690 MPa, the tensile strength of 910-950 MPa and the elongation of 9-11%, and the unnotched impact value of the ADI nodular cast iron prepared at the temperature of 40 DEG C below zero is 105-120 J. The method is applied to the field of nodular cast iron preparation.

Description

technical field [0001] The invention relates to a preparation method of low temperature resistant ADI ductile iron. Background technique [0002] Austenitic ductile iron is referred to as ADI ductile iron. ADI ductile iron mainly refers to ductile iron whose metallographic structure is mainly composed of austenite and bainite after heat treatment. It is obtained by adding a certain amount of nodularizing agent and graphitizing agent to the molten iron before casting to obtain spherical graphite crystals, and is obtained by isothermal quenching heat treatment in a nitrate medium. It has the characteristics of high strength, high plasticity, high toughness, high wear resistance, shock absorption and good bending fatigue strength. Compared with cast steel, it has a higher yield strength ratio. The yield strength ratio is about 0.8-0.9 (the ratio of yield strength to tensile strength). The yield strength ratio of cast steel is only about 0.6, which is a combination of steel and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08C22C37/04C21D5/00
CPCY02P10/20
Inventor 鲍玉龙李亮
Owner 齐齐哈尔市精铸良铸造有限责任公司
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