A preparation method of Cadi nodular cast iron resistant to minus 40°C low temperature impact

A ductile iron, low-temperature impact technology, applied in the direction of improving process efficiency, can solve the problem of low impact power value, and achieve the effects of increasing the pressure in the bag, sufficient spheroidization, and increasing the nucleation ability of graphite

Active Publication Date: 2017-10-20
齐齐哈尔市精铸良铸造有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low unnotched impact energy value of existing CADI ductile iron at -40°C, and to provide a preparation method of CADI ductile iron resistant to minus 40°C low temperature impact

Method used

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  • A preparation method of Cadi nodular cast iron resistant to minus 40°C low temperature impact
  • A preparation method of Cadi nodular cast iron resistant to minus 40°C low temperature impact
  • A preparation method of Cadi nodular cast iron resistant to minus 40°C low temperature impact

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specific Embodiment approach 1

[0026] Specific implementation method 1: This embodiment is a low-temperature impact-resistant CADI ductile iron at minus 40°C. The carbon mass fraction in the minus-40°C low-temperature impact CADI ductile iron is 3.5% to 3.7%, and the silicon mass fraction is 2.70% to 2.90%. , the mass fraction of manganese is less than 0.20%, the mass fraction of chromium is 0.6% to 0.7%, the mass fraction of phosphorus is less than 0.035%, and the mass fraction of copper is 0.8% to 1.0%. The unnotched impact value at -40°C is 25J to 30J.

specific Embodiment approach 2

[0027] Specific implementation mode 2: This implementation mode is a preparation method of CADI ductile iron with low temperature impact resistance at minus 40°C, which is specifically completed according to the following steps:

[0028] 1. Prepare raw materials: Weigh 70 parts of nodular pig iron Q10, 10 parts of low-manganese scrap steel, 20 parts of recycled materials, 0.9-1.0 parts of ferrochrome, 0.8-1.0 parts of copper plate, 1.3-1.36 parts of nodularizer, 0.19-0.23 parts of ultra-fine SiC powder, 0.35-0.40 parts of desulfurizer, 0.9-1.0 parts of ferrosilicon inoculant, 1.0 part of low-manganese crushed steel and 0.08-0.12 parts of silicon-barium inoculant;

[0029] 2. Melting: Add 70 parts of nodular pig iron Q10, 10 parts of low-manganese scrap steel and 20 parts of returned materials weighed in step 1 into the melting furnace, and raise the temperature to 1510 ° C ~ 1530 ° C, and melt at a temperature of 1510 ° C ~ 1530 ° C until it is completely melted, then add 0.9 ...

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the particle size of the ultrafine SiC powder described in step one is less than 40nm, and the mass fraction of SiC in the ultrafine SiC powder is 99.0 %. Others are the same as in the second embodiment.

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Abstract

The invention discloses a CADI nodular cast iron resistant to a low-temperature impact at minus 40 DEG C and a preparation method thereof, and relates to a preparation method for a CADI nodular cast iron resistant to a low-temperature impact. The invention aims at solving the problem of low non-notched impact energy value of the existing CADI nodular cast iron at minus 40 DEG C. In the CADI nodular cast iron resistant to the low-temperature impact at minus 40 DEG C, the mass fractions of carbon, silicon, manganese, chromium, phosphorus and copper are strictly controlled, and the non-notched impact value at the temperature of minus 40 DEG C is 25-30J. The method comprises the following steps: 1. preparing raw materials; 2. smelting; 3. nodulizing and inoculating; 4. removing impurities; 5. casting; and 6. carrying out heat treatment to obtain the CADI nodular cast iron resistant to the low-temperature impact at minus 40 DEG C. The CADI nodular cast iron has the advantages of a yield strength of 750-800MPa, a tensile strength of 1050-1150MPa, an elongation of 3-5% and a hardness value HRC of 40-45. The method disclosed by the invention is mainly used for preparing the CADI nodular cast iron.

Description

technical field [0001] The invention relates to a preparation method of low-temperature impact-resistant CADI nodular cast iron. Background technique [0002] Austenitic ductile iron is referred to as ADI ductile iron for short. ADI ductile iron mainly refers to the ductile iron whose metallographic structure after heat treatment is mainly composed of austenite and bainite; while CADI ductile iron mainly refers to the metallographic structure containing carbides after heat treatment. Austempered ductile iron. It is obtained by adding a certain amount of nodularizing agent, graphitizing agent and a certain amount of ferrochromium (or easy to form carbide alloy) to the molten iron before casting to obtain spherical graphite crystals, and the matrix structure contains a certain amount of carbonization. and obtained by austempering heat treatment in nitrate medium. Ductile iron with comprehensive properties such as high strength, high wear resistance, and good impact toughness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/04C22C37/06C22C33/08C21C1/10C21D1/20C21D5/00
CPCC21C1/10C21D1/20C21D5/00C22C33/08C22C37/04C22C37/06C22C37/10Y02P10/20
Inventor 徐长顺王彬鲍玉龙
Owner 齐齐哈尔市精铸良铸造有限责任公司
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