CN107034412A - It is a kind of for nonmagnetic substance of power connection fitting and preparation method thereof - Google Patents

It is a kind of for nonmagnetic substance of power connection fitting and preparation method thereof Download PDF

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CN107034412A
CN107034412A CN201710240195.0A CN201710240195A CN107034412A CN 107034412 A CN107034412 A CN 107034412A CN 201710240195 A CN201710240195 A CN 201710240195A CN 107034412 A CN107034412 A CN 107034412A
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nonmagnetic substance
rare earth
iron
power connection
connection fitting
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孙帮华
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Anhui Solid Line Equipment Co Ltd
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Anhui Solid Line Equipment Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • C22C33/10—Making cast-iron alloys including procedures for adding magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The present invention proposes a kind of for nonmagnetic substance of power connection fitting and preparation method thereof, and nonmagnetic substance is made including following percentage composition component：Carbon 2.85 3.2%, silicon 1.68 1.80%, manganese 15 19%, copper 5.4 5.8%, chromium 10 16%, nitrogen 0.5 0.8%, rare earth 0.8 1.4%, sulphur≤0.04, phosphorus≤0.02, surplus is iron, the steps such as the present invention is bred by melting, skimming, spheroidization and inoculation, cast, Ageing Treatment are made, obtained nonmagnetic substance has excellent electricity, mechanical property, and processability is good, austenite content is up to more than 80%, magnetic conductivity is less than 1.15, tensile strength is more than 904MPa, and yield strength is more than 723MPa.

Description

It is a kind of for nonmagnetic substance of power connection fitting and preparation method thereof
Technical field
The present invention relates to electric armour clamp technical field, and in particular to a kind of nonmagnetic substance for power connection fitting and Its preparation method.
Background technology
With the development of China's power industry, conveying capacitance is significantly increased, to suspension clamp, strain clamp, damper Gradually cause the concern of people the problem of consumed energy in electricity transmission process Deng wire gold utensil.Due to above gold utensil malleable cast iron Just come to be made with steel ferromagnetism.When, by alternating current, the magnetic that a closure is just formed on electric armour clamp is returned in wire Road, ferromagnetic material remagnetization under action of alternating magnetic field, the change of its magnetic induction intensity always lags behind the change of magnetic field intensity Change (hysteresis).During remagnetization, due to the steering repeatedly of magnetic domain, the molecular friction inside ferromagnetic material generates heat And energy loss is caused, the electric armour clamp of this composition closed-loop path is led during remagnetization because magnetic domain is turned to repeatedly The power attenuation of cause, is exactly so-called magnetic hystersis loss.According to the law of electromagnetic induction, this alternating magnetic field can also be produced inside gold utensil Raw induced electromotive force and induced-current, due to the presence of ferrous materials resistance, necessarily lead to power loss, i.e. eddy-current loss. According to Lenz's law and Faraday's electromagnetic induction law, the induced electromotive force and the size of current of transmission line of electricity produced in gold utensil It is directly proportional.Traditional malleable cast iron, the relative permeability of steel electric armour clamp material are big, there is magnetic hysteresis vortex phenomenon, in transmission of electricity Larger magnetic hysteresis and eddy-current loss is produced on circuit.Accordingly, it would be desirable to develop the electric power that a kind of magnetic conductivity is relatively low, mechanical property is strong Gold utensil material.
The content of the invention
For above-mentioned problem, the present invention proposes a kind of nonmagnetic substance and its system for power connection fitting Preparation Method, is bred, spheroidization and inoculation, cast, the step such as Ageing Treatment are made, obtained nonmagnetic substance tool by melting, skimming There are excellent electricity, mechanical property, and processability is good, austenite content is up to more than 80%, and magnetic conductivity is less than 1.15, tensile strength More than 904MPa, yield strength is more than 723MPa.
In order to realize above-mentioned purpose, the present invention uses following technical scheme：
A kind of nonmagnetic substance for power connection fitting, including following percentage composition component are made：Carbon 2.85- 3.2%th, silicon 1.68-1.80%, manganese 15-19%, copper 5.4-5.8%, chromium 10-16%, nitrogen 0.5-0.8%, rare earth 0.8- 1.4%th, sulphur≤0.04, phosphorus≤0.02, surplus is iron.
It is preferred that, it is made for the nonmagnetic substance of power connection fitting, including following percentage composition component：Carbon 3- 3.2%th, silicon 1.75-1.80%, manganese 18-19%, copper 5.6-5.8%, chromium 15-16%, nitrogen 0.6-0.8%, sulphur≤0.04, phosphorus≤ 0.02, surplus is iron.
It is preferred that, in addition to aluminium 0-4%, aluminium is added in the form of being electrolysed aluminium sheet.
It is preferred that, the rare earth is mass ratio 1:4 cerium, erbium composition, the rare earth are added in the form of the oxide.
It is preferred that, for the preparation method of the nonmagnetic substance of power connection fitting, step is as follows：
1) melt：The pig iron, steel scrap are added melting is heated in medium-frequency induction furnace, part manganese is then added thereto Iron, is warming up to 1620-1630 DEG C under nitrogen atmosphere, then by quartz sand, silicon nitride, ferrochrome, cathode copper and other surplus stocks It is added thereto, sampling analysis, adjustment；
2) skim and breed：1440-1460 DEG C is cooled to, deslagging agent is sprayed to molten iron surface, 1-3min is stirred, deoxidation is taken off Slag, then adds rare earth-stabilizedization inovulant inoculation thereto, is incubated 8-10min, obtains primary molten iron；
3) spheroidization and inoculation：Spheroidization and inoculation processing is carried out using method is poured in bag, nodularization is sequentially placed from lower to upper at bag bottom Agent and rare earth inovulant, then molten iron is poured into nodularization bag, silicon titanate innoculant is added with stream during pouring into, two grades of molten iron are obtained；
4) pour into a mould：In the casting die of two grades of molten iron castings, first casting will be cooled down to obtain；
5) Ageing Treatment：By first casting first in 900-1000 DEG C of quenching and preserving heat 1-2h, then in 500-700 DEG C of tempering insulation 1-2h, repeats above-mentioned quenching, is tempered once, air cooling of coming out of the stove.
It is preferred that, step 1) in before and after ferromanganese the ratio between addition be 2：1.
It is preferred that, step 2) deslagging agent consumption be molten steel quality 0.4-0.6%, rare earth-stabilizedization inovulant consumption be iron The 0.6-1% of water quality.
It is preferred that, step 3) nodulizer be rare earth magnesium copper and iron nodulizer, consumption be molten steel quality 0.7-0.8%.
It is preferred that, step 3) middle rare earth inovulant and silicon titanate innoculant addition ratio be 1:1, it is the 0.3- of molten steel quality 0.5%.
Due to using above-mentioned technical scheme, the beneficial effects of the invention are as follows：The present invention is bred by melting, skimming, ball The steps such as change is bred, poured into a mould, Ageing Treatment are made, using rational formula composition and process modification, obtained nonmagnetic substance Good with excellent electricity, mechanical property, and processability, austenite content is up to more than 80%, and magnetic conductivity is less than 1.15, and tension is strong Degree is more than 904MPa, and yield strength is more than 723MPa.
Nitrogenous content and high manganses and chromium content cast iron materials are made in the present invention, and wherein copper, manganese, chromium is conducive to expanding austenitic area, stable difficult to understand Family name's body, Gao Meng, the solubility for being advantageously selected for improving nitrogen of chromium, not only increases obdurability by nitriding, strengthens impact resistance, And high nitrogen is conducive to improving the stability of austenite, suppresses ferritic and formed, it is ensured that low magnetic property, improve the power of cast iron materials Learn performance and corrosion stability.Carbon is graphite element, and silicon, copper can effectively weaken to promote graphite element or reduce Gao Meng and bring Chilling tendency, and silicon, copper can reduce the formation of carbide, promote the stability of austenite structure.Coordinated using Multi inoculation Nodularization, improves the homogenization of metallographic structure, is conducive to the reasonably combined of each component, and crystal grain thinning strengthens structure property, significantly Improve the combination property of nonmagnetic substance.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention, Technical scheme in the embodiment of the present invention is clearly and completely described.Based on embodiments of the invention, the common skill in this area The every other embodiment that art personnel are obtained under the premise of creative work is not made, belongs to the model that the present invention is protected Enclose.
Embodiment 1：
A kind of nonmagnetic substance for power connection fitting, including following percentage composition component are made：Carbon 3%, silicon 1.68%th, manganese 18%, copper 5.5%, chromium 14%, nitrogen 0.6%, rare earth 1.2%, sulphur≤0.04, phosphorus≤0.02, surplus is iron.Also Including aluminium 4%.
For the preparation method of the nonmagnetic substance of power connection fitting, step is as follows：
1) melt：The pig iron, steel scrap are added melting is heated in medium-frequency induction furnace, part manganese is then added thereto Iron, is warming up to 1620 DEG C, then quartz sand, silicon nitride, ferrochrome, cathode copper and other surplus stocks are added into it under nitrogen atmosphere In, sampling analysis, adjustment；
2) skim and breed：1450 DEG C are cooled to, the deslagging agent of molten steel quality 0.4% is sprayed to molten iron surface, 1- is stirred 3min, deoxidation is skimmed, and the rare earth-stabilizedization inovulant inoculation of molten steel quality 0.8% is then added thereto, is incubated 8- 10min, obtains primary molten iron；
3) spheroidization and inoculation：Spheroidization and inoculation processing is carried out using method is poured in bag, molten iron is sequentially placed from lower to upper at bag bottom The rare earth magnesium copper and iron nodulizer of quality 0.7% and the rare earth inovulant of molten steel quality 0.4%, then molten iron is poured into nodularization bag, The silicon titanate innoculant of molten steel quality 0.4% is added during pouring into stream, two grades of molten iron are obtained；
4) pour into a mould：In the casting die of two grades of molten iron castings, first casting will be cooled down to obtain；
5) Ageing Treatment：By first casting first in 950 DEG C of quenching and preserving heat 1.5h, then in 600 DEG C of tempering insulation 1.5h, repeat Above-mentioned quenching, be tempered once, air cooling of coming out of the stove.
Embodiment 2：
A kind of nonmagnetic substance for power connection fitting, including following percentage composition component are made：Carbon 2.95%, silicon 1.72%th, manganese 16%, copper 5.6%, chromium 15%, nitrogen 0.8%, rare earth 1%, sulphur≤0.04, phosphorus≤0.02, surplus is iron.Also wrap Include aluminium 2%.
For the preparation method of the nonmagnetic substance of power connection fitting, step is as follows：
1) melt：The pig iron, steel scrap are added melting is heated in medium-frequency induction furnace, part manganese is then added thereto Iron, is warming up to 1630 DEG C, then quartz sand, silicon nitride, ferrochrome, cathode copper and other surplus stocks are added into it under nitrogen atmosphere In, sampling analysis, adjustment；
2) skim and breed：1450 DEG C are cooled to, the deslagging agent of molten steel quality 0.6% is sprayed to molten iron surface, 1- is stirred 3min, deoxidation is skimmed, and the rare earth-stabilizedization inovulant inoculation of molten steel quality 0.6% is then added thereto, is incubated 8- 10min, obtains primary molten iron；
3) spheroidization and inoculation：Spheroidization and inoculation processing is carried out using method is poured in bag, molten iron is sequentially placed from lower to upper at bag bottom The rare earth magnesium copper and iron nodulizer of quality 0.7% and the rare earth inovulant of molten steel quality 0.3%, then molten iron is poured into nodularization bag, The silicon titanate innoculant of molten steel quality 0.3% is added during pouring into stream, two grades of molten iron are obtained；
4) pour into a mould：In the casting die of two grades of molten iron castings, first casting will be cooled down to obtain；
5) Ageing Treatment：By first casting first in 900 DEG C of quenching and preserving heat 2h, then in 500 DEG C of tempering insulation 2h, repeat above-mentioned Quench, be tempered once, air cooling of coming out of the stove.
Embodiment 3：
A kind of nonmagnetic substance for power connection fitting, including following percentage composition component are made：Carbon 2.85%, silicon 1.8%th, manganese 17%, copper 5.7%, chromium 10%, nitrogen 0.7%, rare earth 0.8%, sulphur≤0.04, phosphorus≤0.02, surplus is iron.Also wrap Include aluminium 3%.
For the preparation method of the nonmagnetic substance of power connection fitting, step is as follows：
1) melt：The pig iron, steel scrap are added melting is heated in medium-frequency induction furnace, part manganese is then added thereto Iron, is warming up to 1620 DEG C, then quartz sand, silicon nitride, ferrochrome, cathode copper and other surplus stocks are added into it under nitrogen atmosphere In, sampling analysis, adjustment；
2) skim and breed：1440 DEG C are cooled to, the deslagging agent of molten steel quality 0.5% is sprayed to molten iron surface, 1- is stirred 3min, deoxidation is skimmed, and the rare earth-stabilizedization inovulant inoculation of molten steel quality 0.8% is then added thereto, is incubated 8- 10min, obtains primary molten iron；
3) spheroidization and inoculation：Spheroidization and inoculation processing is carried out using method is poured in bag, molten iron is sequentially placed from lower to upper at bag bottom The rare earth magnesium copper and iron nodulizer of quality 0.8% and the rare earth inovulant of molten steel quality 0.5%, then molten iron is poured into nodularization bag, The silicon titanate innoculant of molten steel quality 0.5% is added during pouring into stream, two grades of molten iron are obtained；
4) pour into a mould：In the casting die of two grades of molten iron castings, first casting will be cooled down to obtain；
5) Ageing Treatment：By first casting first in 1000 DEG C of quenching and preserving heat 1h, then in 550 DEG C of tempering insulation 1.5h, repeat Above-mentioned quenching, be tempered once, air cooling of coming out of the stove.
Embodiment 4：
A kind of nonmagnetic substance for power connection fitting, including following percentage composition component are made：Carbon 3.1%, silicon 1.75%th, manganese 18%, copper 5.7%, chromium 12%, nitrogen 0.65%, rare earth 1.2%, sulphur≤0.04, phosphorus≤0.02, surplus is iron.
For the preparation method of the nonmagnetic substance of power connection fitting, step is as follows：
1) melt：The pig iron, steel scrap are added melting is heated in medium-frequency induction furnace, part manganese is then added thereto Iron, is warming up to 1620 DEG C, then quartz sand, silicon nitride, ferrochrome, cathode copper and other surplus stocks are added into it under nitrogen atmosphere In, sampling analysis, adjustment；
2) skim and breed：1460 DEG C are cooled to, the deslagging agent of molten steel quality 0.5% is sprayed to molten iron surface, 1- is stirred 3min, deoxidation is skimmed, and the rare earth-stabilizedization inovulant inoculation of molten steel quality 0.7% is then added thereto, is incubated 8- 10min, obtains primary molten iron；
3) spheroidization and inoculation：Spheroidization and inoculation processing is carried out using method is poured in bag, molten iron is sequentially placed from lower to upper at bag bottom The rare earth magnesium copper and iron nodulizer of quality 0.8% and the rare earth inovulant of molten steel quality 0.4%, then molten iron is poured into nodularization bag, The silicon titanate innoculant of molten steel quality 0.4% is added during pouring into stream, two grades of molten iron are obtained；
4) pour into a mould：In the casting die of two grades of molten iron castings, first casting will be cooled down to obtain；
5) Ageing Treatment：By first casting first in 1000 DEG C of quenching and preserving heat 1.5h, then in 700 DEG C of tempering insulation 1.5h, weight Answer above-mentioned quenching, be tempered once, air cooling of coming out of the stove.
Embodiment 5：
A kind of nonmagnetic substance for power connection fitting, including following percentage composition component are made：Carbon 3.2%, silicon 1.75%th, manganese 19%, copper 5.6%, chromium 14%, nitrogen 0.5%, rare earth 1.1%, sulphur≤0.04, phosphorus≤0.02, surplus is iron.Also Including aluminium 1%.
For the preparation method of the nonmagnetic substance of power connection fitting, step is as follows：
1) melt：The pig iron, steel scrap are added melting is heated in medium-frequency induction furnace, part manganese is then added thereto Iron, is warming up to 1620 DEG C, then quartz sand, silicon nitride, ferrochrome, cathode copper and other surplus stocks are added into it under nitrogen atmosphere In, sampling analysis, adjustment；
2) skim and breed：1450 DEG C are cooled to, the deslagging agent of molten steel quality 0.4% is sprayed to molten iron surface, 1- is stirred 3min, deoxidation is skimmed, and the rare earth-stabilizedization inovulant inoculation of molten steel quality 0.7% is then added thereto, is incubated 8- 10min, obtains primary molten iron；
3) spheroidization and inoculation：Spheroidization and inoculation processing is carried out using method is poured in bag, molten iron is sequentially placed from lower to upper at bag bottom The rare earth magnesium copper and iron nodulizer of quality 0.8% and the rare earth inovulant of molten steel quality 0.3%, then molten iron is poured into nodularization bag, The silicon titanate innoculant of molten steel quality 0.3% is added during pouring into stream, two grades of molten iron are obtained；
4) pour into a mould：In the casting die of two grades of molten iron castings, first casting will be cooled down to obtain；
5) Ageing Treatment：By first casting first in 950 DEG C of quenching and preserving heat 2h, then on 500 DEG C of tempering insulation 1.5h, repetition State quenching, be tempered once, air cooling of coming out of the stove.
Embodiment 6：
A kind of nonmagnetic substance for power connection fitting, including following percentage composition component are made：Carbon 3.15%, silicon 1.7%th, manganese 15%, copper 5.8%, chromium 16%, nitrogen 0.75%, rare earth 1.4%, sulphur≤0.04, phosphorus≤0.02, surplus is iron.Also Including aluminium 2%.
For the preparation method of the nonmagnetic substance of power connection fitting, step is as follows：
1) melt：The pig iron, steel scrap are added melting is heated in medium-frequency induction furnace, part manganese is then added thereto Iron, is warming up to 1630 DEG C, then quartz sand, silicon nitride, ferrochrome, cathode copper and other surplus stocks are added into it under nitrogen atmosphere In, sampling analysis, adjustment；
2) skim and breed：1440 DEG C are cooled to, the deslagging agent of molten steel quality 0.4% is sprayed to molten iron surface, 1- is stirred 3min, deoxidation is skimmed, and the rare earth-stabilizedization inovulant inoculation of molten steel quality 1% is then added thereto, is incubated 8- 10min, obtains primary molten iron；
3) spheroidization and inoculation：Spheroidization and inoculation processing is carried out using method is poured in bag, molten iron is sequentially placed from lower to upper at bag bottom The rare earth magnesium copper and iron nodulizer of quality 0.8% and the rare earth inovulant of molten steel quality 0.3%, then molten iron is poured into nodularization bag, The silicon titanate innoculant of molten steel quality 0.3% is added during pouring into stream, two grades of molten iron are obtained；
4) pour into a mould：In the casting die of two grades of molten iron castings, first casting will be cooled down to obtain；
5) Ageing Treatment：By first casting first in 950 DEG C of quenching and preserving heat 1h, then in 600 DEG C of tempering insulation 1h, repeat above-mentioned Quench, be tempered once, air cooling of coming out of the stove.
Embodiment 7：
A kind of nonmagnetic substance for power connection fitting, including following percentage composition component are made：Carbon 3.05%, silicon 1.78%th, manganese 15%, copper 5.6%, chromium 15%, nitrogen 0.7%, rare earth 0.9%, sulphur≤0.04, phosphorus≤0.02, surplus is iron.
For the preparation method of the nonmagnetic substance of power connection fitting, step is as follows：
1) melt：The pig iron, steel scrap are added melting is heated in medium-frequency induction furnace, part manganese is then added thereto Iron, is warming up to 1630 DEG C, then quartz sand, silicon nitride, ferrochrome, cathode copper and other surplus stocks are added into it under nitrogen atmosphere In, sampling analysis, adjustment；
2) skim and breed：1450 DEG C are cooled to, the deslagging agent of molten steel quality 0.6% is sprayed to molten iron surface, 1- is stirred 3min, deoxidation is skimmed, and the rare earth-stabilizedization inovulant inoculation of molten steel quality 0.8% is then added thereto, is incubated 8- 10min, obtains primary molten iron；
3) spheroidization and inoculation：Spheroidization and inoculation processing is carried out using method is poured in bag, molten iron is sequentially placed from lower to upper at bag bottom The rare earth magnesium copper and iron nodulizer of quality 0.7% and the rare earth inovulant of molten steel quality 0.5%, then molten iron is poured into nodularization bag, The silicon titanate innoculant of molten steel quality 0.5% is added during pouring into stream, two grades of molten iron are obtained；
4) pour into a mould：In the casting die of two grades of molten iron castings, first casting will be cooled down to obtain；
5) Ageing Treatment：By first casting first in 900 DEG C of quenching and preserving heat 1.5h, then on 550 DEG C of tempering insulation 2h, repetition State quenching, be tempered once, air cooling of coming out of the stove.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments The present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic；And these modification or Replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (9)

1. a kind of nonmagnetic substance for power connection fitting, it is characterised in that be made including following percentage composition component：Carbon 2.85-3.2%, silicon 1.68-1.80%, manganese 15-19%, copper 5.4-5.8%, chromium 10-16%, nitrogen 0.5-0.8%, rare earth 0.8- 1.4%th, sulphur≤0.04, phosphorus≤0.02, surplus is iron.
2. a kind of nonmagnetic substance for power connection fitting, it is characterised in that be made including following percentage composition component：Carbon 3-3.2%, silicon 1.75-1.80%, manganese 18-19%, copper 5.6-5.8%, chromium 15-16%, nitrogen 0.6-0.8%, sulphur≤0.04, phosphorus ≤ 0.02, surplus is iron.
3. the nonmagnetic substance according to claim 1 or 2 for power connection fitting, it is characterised in that：Also include aluminium 0-4%, aluminium is added in the form of being electrolysed aluminium sheet.
4. the nonmagnetic substance according to claim 1 or 2 for power connection fitting, it is characterised in that：The rare earth For mass ratio 1:4 cerium, erbium composition, the rare earth are added in the form of the oxide.
5. the preparation method of the nonmagnetic substance according to claim 1 or 2 for power connection fitting, its feature exists In step is as follows：
1) melt：The pig iron, steel scrap are added melting is heated in medium-frequency induction furnace, part ferromanganese is then added thereto, 1620-1630 DEG C is warming up under nitrogen atmosphere, then quartz sand, silicon nitride, ferrochrome, cathode copper and other surplus stocks are added it In, sampling analysis, adjustment；
2) skim and breed：1440-1460 DEG C is cooled to, deslagging agent is sprayed to molten iron surface, 1-3min is stirred, deoxidation is skimmed, so Add rare earth-stabilizedization inovulant inoculation thereto afterwards, be incubated 8-10min, obtain primary molten iron；
3) spheroidization and inoculation：Using bag in pour method carry out spheroidization and inoculation processing, bag bottom be sequentially placed from lower to upper nodulizer with Rare earth inovulant, then molten iron is poured into nodularization bag, silicon titanate innoculant is added with stream during pouring into, two grades of molten iron are obtained；
4) pour into a mould：In the casting die of two grades of molten iron castings, first casting will be cooled down to obtain；
5) Ageing Treatment：By first casting first in 900-1000 DEG C of quenching and preserving heat 1-2h, then in 500-700 DEG C of tempering insulation 1- 2h, repeats above-mentioned quenching, is tempered once, air cooling of coming out of the stove.
6. the preparation method of the nonmagnetic substance according to claim 5 for power connection fitting, it is characterised in that：Step It is rapid 1) in before and after ferromanganese the ratio between addition be 2：1.
7. the preparation method of the nonmagnetic substance according to claim 5 for power connection fitting, it is characterised in that：Step Rapid 2) deslagging agent consumption is the 0.4-0.6% of molten steel quality, and rare earth-stabilizedization inovulant consumption is the 0.6-1% of molten steel quality.
8. the preparation method of the nonmagnetic substance according to claim 5 for power connection fitting, it is characterised in that：Step Rapid 3) nodulizer is rare earth magnesium copper and iron nodulizer, and consumption is the 0.7-0.8% of molten steel quality.
9. the preparation method of the nonmagnetic substance according to claim 5 for power connection fitting, it is characterised in that：Step Rapid 3) middle rare earth inovulant is 1 with silicon titanate innoculant addition ratio:1, it is the 0.3-0.5% of molten steel quality.
CN201710240195.0A 2017-04-13 2017-04-13 It is a kind of for nonmagnetic substance of power connection fitting and preparation method thereof Pending CN107034412A (en)

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CN102296227A (en) * 2010-06-22 2011-12-28 樊哲斌 Novel material of low-chromium cast iron
CN103328670A (en) * 2010-12-28 2013-09-25 埃克森美孚研究工程公司 High manganese containing steels for oil gas and petrochemical applications
CN105331874A (en) * 2015-09-26 2016-02-17 山东惠宇精密机械有限公司 Spheroidal graphite cast iron cast gear and machining process thereof

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