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High-nickel austenitic spheroidal graphite cast iron and preparation method thereof

A ductile iron and austenite technology, applied in the field of high nickel austenitic ductile iron and its preparation, can solve the problems of unstable metallographic structure, wide chemical composition range, large shrinkage, etc., and can inhibit the precipitation of carbides. , the effect of efficient breeding effect

Inactive Publication Date: 2015-03-25
HENGYANG CITY CHAOYANG AUTO PARTS MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing high-nickel austenitic ductile iron has inconsistent standards, the chemical composition range is too wide, and there is no metallographic structure for stable production of this material, which is not suitable for long-term stable production; the chemical composition contains a large number of promoting carbide elements, Such as chromium, manganese, etc., the molten iron tends to be white, the fluidity of the molten iron is poor, and the shrinkage is large. If the process is not handled properly, it is easy to obtain castings with high brittleness, carbides exceeding 30%, and unqualified spheroidization grades.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The quality ratio of raw materials of high nickel austenitic ductile iron is as follows: pig iron 40%, scrap steel 15%, electrolytic pure nickel 35%, nickel magnesium silicon nodulizer 0.8%; ferrochrome 4%, silicon manganese zirconium inoculant 0.6%, Silicon strontium inoculant 0.1%, ferrosilicon 1.5%, ferromanganese 1.5%, recarburizer 1.5%. Electrolytic pure nickel contains Ni 99.91%, C 0.01%, Si 0.03%, S 0.01%, P 0.04%; silicon manganese zirconium inoculant contains Zr 3%, Si 60%, Mn 5%, the rest is Fe; The silicon strontium inoculant contains 0.5% Sr, 60% Si, and the rest is Fe.

[0019] A method for preparing high-nickel austenitic ductile iron, comprising the following steps:

[0020] (1) Smelting: The raw materials are batched according to the above mass ratio, and the recarburizer, pig iron, and scrap steel are first put into the intermediate frequency induction furnace, and after all the molten iron is melted, slag removal, slag removal, heat preservation, and ...

Embodiment 2

[0025] The quality ratio of raw materials of high nickel austenitic ductile iron is as follows: 45% pig iron, 10% steel scrap, 35% electrolytic pure nickel, 1.2% nickel-magnesium-silicon spheroidizer; 3% ferrochrome, 1.0% silico-manganese-zirconium inoculant, Silicon strontium inoculant 0.3%, ferrosilicon 0.75%, ferromanganese 2.2%, recarburizer 1.55%. Electrolytic pure nickel contains Ni 99.8%, C 0.01%, Si 0.04%, S 0.02%, P 0.03%; silicon manganese zirconium inoculant contains Zr 4%, Si 65%, Mn 3%, the rest is Fe; The silicon strontium inoculant contains 1.0% of Sr, 55% of Si, and the rest is Fe.

[0026] A method for preparing high-nickel austenitic ductile iron, comprising the following steps:

[0027] (1) Smelting: The raw materials are batched according to the above mass ratio, and the recarburizer, pig iron, and scrap steel are first put into the intermediate frequency induction furnace, and after all the molten iron is melted, slag removal, slag removal, heat preservat...

Embodiment 3

[0032] The mass ratio of raw materials of high-nickel austenitic ductile iron is as follows: pig iron 42%, scrap steel 11.7%, electrolytic pure nickel 36.5%, nickel-magnesium-silicon spheroidizer 0.9%, ferrochrome 3.5%, silicon-manganese-zirconium inoculant 0.75%, Silicon strontium inoculant 0.2%, ferrosilicon 0.75%, ferromanganese 1.5%, recarburizer 2.2%. Electrolytic pure nickel contains Ni 99.86%, C 0.008%, Si 0.02%, S 0.012%, P 0.05%; silicon manganese zirconium inoculant contains Zr 5%, Si 55%, Mn 4%, the rest is Fe; The silicon strontium inoculant contains 0.8% of Sr, 57% of Si, and the rest is Fe.

[0033] A method for preparing high-nickel austenitic ductile iron, comprising the following steps:

[0034] (1) Smelting: The raw materials are batched according to the above mass ratio, and the recarburizer, pig iron, and scrap steel are first put into the intermediate frequency induction furnace, and after all the molten iron is melted, slag removal, slag removal, heat pr...

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Abstract

The invention relates to the field of alloy cast iron and provides high-nickel austenitic spheroidal graphite cast iron and a preparation method thereof. The spheroidal graphite cast iron comprises the following chemical components in percentage by weight: 1.7-2.0% of C, 4.5-5.5% of Si, 34-36% of Ni, 0.5-1% of Mn, 1.5-2.5% of Cr and the balance of Fe. According to the high-nickel austenitic spheroidal graphite cast iron, the material formula is deeply researched, a unique nodularizing-inoculating technology is adopted, and the qualified chemical components and metallographic structures are simultaneously ensured, so that a casting with qualified mechanical properties can be stably obtained.

Description

technical field [0001] The invention relates to the field of alloy cast iron materials, in particular to a high-nickel austenitic nodular cast iron and a preparation method thereof. Background technique [0002] The existing high-nickel austenitic ductile iron has inconsistent standards, the chemical composition range is too wide, and there is no metallographic structure for stable production of this material, which is not suitable for long-term stable production; the chemical composition contains a large number of promoting carbide elements, Such as chromium, manganese, etc., the molten iron tends to be white, the fluidity of the molten iron is poor, and the shrinkage is large. If the process is not handled properly, it is easy to obtain castings with high brittleness, carbides exceeding 30%, and unqualified spheroidization grades. Therefore, it is necessary to find a reliable method to stably obtain castings with qualified mechanical properties. Contents of the invention...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/08B22D1/00
Inventor 吴建华袁奇志
Owner HENGYANG CITY CHAOYANG AUTO PARTS MFG CO LTD