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Non-magnetic vermicular graphite cast iron material

A technology of vermicular graphite cast iron and weight percentage, applied in the field of cast iron materials, can solve the problems of loss of the properties of non-magnetic materials, easy decomposition and oxidation of the structure, poor machining performance, etc., to expand the scope of application, without heat treatment, reduce The effect of permeability

Inactive Publication Date: 2015-11-04
李明弟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the typical matrix structures of manganese-based non-magnetic cast iron (ZL200610042044.6) and Mn-based non-magnetic ductile iron (ZL200910020800.9) are "austenite + flake graphite + cementite (5%)" and "Austenite + spherical graphite + cementite (3%)", because the hardness is too high (Bush hardness 260-290HB), the machinability is poor, so it can only be used on unprocessed or rough machined parts; nickel series Although non-magnetic cast iron has low hardness, it is prone to work hardening, and it is difficult to use it on non-magnetic parts that require fine processing. Moreover, due to the scarcity of resources and high cost, the application of materials is limited.
At the same time, the high-temperature stability of the matrix structure of the above-mentioned materials is poor. When the working temperature exceeds 300 ° C, the structure is prone to decomposition and oxidation, which increases the magnetic permeability of the material and changes in size, and loses the application of non-magnetic materials. have performance

Method used

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  • Non-magnetic vermicular graphite cast iron material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]A non-magnetic vermicular graphite cast iron material, the weight percentage of each component is: C2.8%, Si4.2%, Ni5.0%, Mn8.0%, Cu4.0%, Al0.4%, Mg (residual) 0.01-0.018%, Re (residual) 0.01-0.02%, the total amount of impurities (S, P, etc.) ≤ 0.2%, and the rest is Fe. Its concrete preparation steps are:

[0029] (1) Ingredients The raw materials used mainly include primary iron (Z18), steel scrap (45 # ), electrolytic nickel (Ni99.50), ferromanganese (65FeMn), ferrosilicon (75FeSi), electrolytic copper (1 # ), etc., the ratio of raw materials is determined according to the above-mentioned non-magnetic vermicular graphite cast iron material composition requirements. Among them, Si / Mn=0.52-0.59, Ni / Mn=0.5-0.63, Cu / Mn=0.47-0.5, and the silicon content in the original molten iron is 3.2%.

[0030] (2) Melting According to the material ratio in the previous step, put the material into the intermediate frequency electric furnace for smelting, and the temperature of the fu...

Embodiment 2

[0036] A non-magnetic vermicular graphite cast iron material, the weight percentage of each component is: C2.9%, Si4.0%, Ni4.5%, Mn7.5%, Cu3.6%, Al0.5%, Mg (residual) 0.01-0.018%, Re (residual) 0.01-0.02%, the total amount of impurities (S, P, etc.) ≤ 0.2%, and the rest is Fe. Its concrete preparation steps are:

[0037] (1) Ingredients The raw materials used mainly include primary iron (Z18), steel scrap (45 # ), electrolytic nickel (Ni99.50), ferromanganese (65FeMn), ferrosilicon (75FeSi), electrolytic copper (1 # ), pure aluminum (5052), vermicular agent (FeSiMgRe), etc., the ratio of raw materials is determined according to the above-mentioned non-magnetic vermicular graphite cast iron material composition requirements. Among them, Si / Mn=0.52-0.59, Ni / Mn=0.5-0.63, Cu / Mn=0.47-0.5, and the silicon content in the original molten iron is 3.0%.

[0038] (2) Melting According to the material ratio in the previous step, put the material into the intermediate frequency electric...

Embodiment 3

[0044] A non-magnetic vermicular graphite cast iron material, the weight percentage of each component is: C3.0%, Si3.8%, Ni4.0%, Mn7.0%, Cu3.4%, Al0.55%, Mg (residual) 0.01-0.018%, Re (residual) 0.01-0.02%, the total amount of impurities (S, P, etc.) ≤ 0.2%, and the rest is Fe. Its concrete preparation steps are:

[0045] (1) Ingredients The raw materials used mainly include primary iron (Z18), steel scrap (45 # ), electrolytic nickel (Ni99.50), ferromanganese (65FeMn), ferrosilicon (75FeSi), electrolytic copper (1 # ), pure aluminum (5052), vermicular agent (FeSiMgRe), etc., the ratio of raw materials is determined according to the above-mentioned non-magnetic vermicular graphite cast iron material composition requirements. Among them, Si / Mn=0.52-0.59, Ni / Mn=0.5-0.63, Cu / Mn=0.47-0.5, and the silicon content in the original molten iron is 2.8%.

[0046] (2) Melting According to the material ratio in the previous step, put the material into the intermediate frequency electri...

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Abstract

The invention discloses a non-magnetic vermicular graphite cast iron material, belonging to the field of a cast iron material. The material comprises the following components in percentage by weight: 2.8-3.5% of C, 3.5-4.2% of Si, 3.0-5.0% of Ni, 6.0-8.0% of Mn, 3.0-4.0% of Cu, 0.4-0.7% of Al, 0.01-0.018% of Mg (residue), 0.01-0.02% of Re (residue), less than or equal to 0.2% of impurities (such as S and P) in total and the balance of Fe. The material is prepared from the main raw materials such as raw pig iron, waste steel, ferrosilicon, ferromanganese, electrolytic nickel and pure copper by virtue of the processes of dosing, smelting, vermicularizing, multi-inoculation, pouring, box opening and air cooling and sand burying, heat preservation and cooling. The matrix structure of the material comprises vermicular graphite, austenite and cementite (less than 2%); the material has low magnetic conductivity, high thermal stability and excellent processability, and is suitable for the production and application of precise non-magnetic parts.

Description

technical field [0001] The invention relates to the field of cast iron materials, in particular to a non-magnetic vermicular graphite cast iron material. Background technique [0002] In the military, the hulls, host equipment and weaponry of most ships with high levels of magnetic protection are mostly made of non-magnetic materials in order to avoid induction magnetic fields and improve the safety of military facilities, especially the non-magnetic materials on modern minesweepers. Magnetic motor, all parts are made of non-magnetic materials. In the industry, all kinds of large-scale generator sets, transformers, power transmission and other equipment are equipped with anti-magnetic structural parts. If these parts have high magnetic permeability, large eddy currents will be generated inside the parts, consuming a lot of electric energy, and The parts will be damaged due to the temperature rise, so these parts need to be made of metal materials with relatively low magneti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08
Inventor 李强李明弟李大勇陈举欣王志刚
Owner 李明弟
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