CN105950959A - High-nickel austenite nodular cast iron and production technique for same - Google Patents

High-nickel austenite nodular cast iron and production technique for same Download PDF

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Publication number
CN105950959A
CN105950959A CN201610567296.4A CN201610567296A CN105950959A CN 105950959 A CN105950959 A CN 105950959A CN 201610567296 A CN201610567296 A CN 201610567296A CN 105950959 A CN105950959 A CN 105950959A
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nickel
cast iron
iron
nodular cast
parts
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薛继长
汪国林
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Anhui Debao Compressor Co Ltd
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Anhui Debao Compressor 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
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron
    • 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
    • C21D5/00—Heat treatments of cast-iron
    • 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
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • 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
    • C22C37/08—Cast-iron alloys containing chromium with nickel
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/003—Cementite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/006—Graphite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (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 invention discloses high-nickel austenite nodular cast iron. The high-nickel austenite nodular cast iron is characterized in that the austenite nodular cast iron comprises the following chemical components in percentage by weight: 2.35-2.7% of carbon, 1.75-2.0% of silicon, 0.7-0.9% of manganese, smaller than or equal to 0.05% of phosphor, 18-19.5% of nickel, 1.75-1.9% of chromium, 0.05-0.065% of magnesium and the balance of iron. The production technique for the high-nickel austenite nodular cast iron comprises the following steps of material preparation, medium-frequency furnace smelting, sampling analysis, molten metal outlet nodulizing, inoculation treatment, solid solution strengthening and ageing treatment. According to the high-nickel austenite nodular cast iron and the production technique, a casting with qualified mechanical performance can be obtained through the reasonable production technique, and the casting is applicable to long-term stable production; a substrate texture is strengthened through thermal treatment modes of solid solution strengthening and ageing treatment, and the tenacity of the substrate texture is enhanced; the grains are refined; segregation is omitted; internal stress is lowered; and therefore the texture and performance are more uniform, and the requirement of corrosion resistance, especially sea water corrosion resistance is met.

Description

A kind of high-nickel austenite nodular cast iron and production technology thereof
Technical field
The invention belongs to spheroidal graphite cast-iron field, particularly relate to a kind of high-nickel austenite nodular cast iron and produce work Skill.
Background technology
Austenite ductile cast iron is to use a kind of alloy material widely now, it have good corrosivity, Thermostability, low temperature intensity and mechanical performance, be widely used in household supplies, auto parts machinery, medical apparatus, Building materials, chemical industry, food industry, agricultural, ship components etc..
The standard disunity that existing high-nickel austenite nodular cast iron exists, chemical composition ranges is the widest, also without steady Surely produce the metallographic structure of this material, be not suitable for producing steadily in the long term, containing substantial amounts of rush in chemical composition Entering carbide formers, such as chromium, manganese etc., molten iron chilling tendency is very big, and molten iron flow is poor, and contracting is big, as Really PROCESS FOR TREATMENT is improper, easily obtains that fragility is big, the carbide tissue more than 30%, and nodulizing grade is defective Foundry goods.It is, thus, sought for a kind of method that can stably obtain qualified mechanical property foundry goods reliably.
Summary of the invention
It is an object of the invention to the problem above overcoming prior art to exist, it is provided that a kind of high-nickel austenite ball Ink cast iron and production technology thereof, it is possible to obtain the foundry goods of qualified mechanical property and be suitable to produce steadily in the long term.
For realizing above-mentioned technical purpose, reaching above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of high-nickel austenite nodular cast iron, described austenite ductile cast iron includes the change of following percetage by weight Studying point: carbon 2.35～2.7%, silicon 1.75～2.0%, manganese 0.7～0.9%, phosphorus is less than or equal to 0.05%, nickel 18～19.5%, chromium 1.75～1.9%, magnesium 0.05～0.065%, surplus is ferrum.
The present invention also provides for a kind of high-nickel austenite nodular cast iron production technology, and described production technology includes following Step:
(1) dispensing prepares: according to the component preparation dispensing of following ratio of weight and number: the pig iron 150 parts, steel scrap 320 parts, carburant 11.5 parts, nickel plate 120 parts, chromic carbide iron 19.5 parts, 8.5 parts of ferromanganese, ferrosilicon 10 Part；
(2) intermediate frequency furnace melting: first the pig iron, steel scrap being loaded in stove, carburant joins electric furnace middle and lower part, Adding nickel plate, chromic carbide iron, ferromanganese, ferrosilicon after the pig iron, scrap melting, wherein nickel plate is after melting Phase adds, and ferromanganese, ferrosilicon are eventually adding before water outlet after base iron analysis；
(3) sample analysis: after molten iron is melting down, temperature reaches 1460 DEG C of sample analysis carried out above, according to molten iron Chemical composition requires to be adjusted, adjust qualified after, be warming up to 1510 DEG C, and in stove, add silicon, manganese enter Row deoxidation；
Wherein, molten iron studies and is divided into: carbon 2.55～2.80%, and silicon is less than or equal to 0.4%, and manganese is less than or equal to 0.05%, Phosphorus is less than or equal to 0.05%, and nickel 18～19%, chromium 1.8～1.9%, sulfur is less than or equal to 0.02%, and surplus is ferrum；
(4) water outlet nodularization: when temperature reaches 1540～1550 DEG C, carry out coming out of the stove nodularization, and nodulizer uses Nickel magnesium alloy, addition is 0.75%；
(5) inoculation: use the mode of three inoculation, uses silicon strontium inovulant when cast Carrying out current-following inoculation, wherein current-following inoculation addition is 0.15%, and granularity is 0.8～1mm；
(6) solution strengthening: for the austenite ductile cast iron of the Langaloy after inoculation at 900 DEG C More than using oil quenching to carry out intensive treatment, heating gradient is less than or equal to 150 DEG C/h, reaches in temperature It is incubated 4 hours after 950 DEG C, then carries out oil cold；
(7) Ageing Treatment: being heated by the austenite ductile cast iron after solution strengthening, heating gradient is less than Equal to 150 DEG C/h, after temperature reaches 635 DEG C, it is incubated 2 hours, and cools to 200 DEG C with the furnace, then Carry out air cooling.
Further, in described dispensing preparation process, steel scrap uses pure punching press leftover pieces, and the pig iron uses south Non-high-purity pig iron, and all dispensings are all without greasy dirt, non-corroding, and keep being dried and clean conditions so that ferrum Liquid is contained within tension-active element such as lead, the arsenic etc. of trace, and without in rare earth element and time, it is to avoid occur broken Broken shape graphite.
Further, described intermediate frequency furnace melting step is added coverture and carries out covering melting, coordinate and accelerate to melt Refining speed so that reduce ferrum liquid air-breathing in fusion process, and prevent furnace charge from putting up a bridge.
Further, in described water outlet spheronization step, nodulizer does not contains rare earth, prevents the rare earth of residual in ferrum liquid Element makes graphite become block.
Further, in described water outlet spheronization step nickel magnesium alloy by 15～the magnesium of 16% and 80～the nickel group of 85% Becoming, the granularity of nickel magnesium alloy is 10～25 mesh, improves nodularization effect.
The invention has the beneficial effects as follows:
The present invention is by rational production technology, it is possible to obtains the foundry goods of qualified mechanical property and is suitable to long-term steady Fixed production, by the heat treatment mode of solution strengthening Yu Ageing Treatment, enhances matrix, and increases it Toughness, crystal grain thinning, eliminates segregation, reduces internal stress, makes tissue and performance more uniform, and makes The mechanical performance of austenite ductile cast iron, matrix meet the requirement of hot strength, yield strength.
Detailed description of the invention
In order to deepen the understanding of the present invention, below in conjunction with embodiment, the invention will be further described, and this is real Execute example to be only used for explaining the present invention, be not intended that limiting the scope of the present invention.
Embodiment 1:
A kind of high-nickel austenite nodular cast iron, described austenite ductile cast iron includes the change of following percetage by weight Study point: carbon 2.35%, silicon 1.75%, manganese 0.7%, phosphorus 0.05%, nickel 18%, chromium 1.75%, magnesium 0.05%, Surplus is ferrum.
A kind of high-nickel austenite nodular cast iron production technology, production technology comprises the following steps:
(1) dispensing prepares: according to the component preparation dispensing of following ratio of weight and number: the pig iron 150 parts, steel scrap 320 parts, carburant 11.5 parts, nickel plate 120 parts, chromic carbide iron 19.5 parts, 8.5 parts of ferromanganese, ferrosilicon 10 Part；
(2) intermediate frequency furnace melting: first the pig iron, steel scrap being loaded in stove, carburant joins electric furnace middle and lower part, Adding nickel plate, chromic carbide iron, ferromanganese, ferrosilicon after the pig iron, scrap melting, wherein nickel plate is after melting Phase adds, and ferromanganese, ferrosilicon are eventually adding before water outlet after base iron analysis；
(3) sample analysis: after molten iron is melting down, temperature reaches 1460 DEG C of sample analysis carried out above, according to molten iron Chemical composition requires to be adjusted, adjust qualified after, be warming up to 1510 DEG C, and in stove, add silicon, manganese enter Row deoxidation；
Wherein, molten iron studies and is divided into: carbon 2.55%, silicon 0.4%, manganese 0.05%, phosphorus 0.05%, nickel 18%, Chromium 1.8%, sulfur 0.02%, surplus is ferrum；
(4) water outlet nodularization: when temperature reaches 1540 DEG C, carry out coming out of the stove nodularization, and nodulizer uses nickel magnesium to close Gold, addition is 0.75%；
(5) inoculation: use the mode of three inoculation, uses silicon strontium inovulant when cast Carrying out current-following inoculation, wherein current-following inoculation addition is 0.15%, and granularity is 0.8mm；
(6) solution strengthening: for the austenite ductile cast iron of the Langaloy after inoculation at 900 DEG C More than using oil quenching to carry out intensive treatment, heating gradient is less than or equal to 150 DEG C/h, reaches in temperature It is incubated 4 hours after 950 DEG C, then carries out oil cold；
(7) Ageing Treatment: being heated by the austenite ductile cast iron after solution strengthening, heating gradient is less than Equal to 150 DEG C/h, after temperature reaches 635 DEG C, it is incubated 2 hours, and cools to 200 DEG C with the furnace, then Carry out air cooling.
Wherein, in dispensing preparation process, steel scrap uses pure punching press leftover pieces, and the pig iron uses the high-purity life in South Africa Ferrum, and all dispensings are all without greasy dirt, non-corroding, and keep being dried and clean conditions so that ferrum liquid is contained within The tension-active element of trace such as lead, arsenic etc., and without in rare earth element and time, it is to avoid broken shape graphite occurs, Intermediate frequency furnace melting step is added coverture carry out covering melting, coordinate and accelerate speed of melting so that melting Reducing ferrum liquid air-breathing in journey, and prevent furnace charge from putting up a bridge, in water outlet spheronization step, nodulizer does not contains rare earth, prevents In ferrum liquid, the rare earth element of residual makes graphite become block, in water outlet spheronization step nickel magnesium alloy by 15% magnesium With the nickel composition of 85%, the granularity of nickel magnesium alloy is 10 mesh, improves nodularization effect.
Austenite ductile cast iron mechanical performance and matrix that the present embodiment obtains are as shown in the table:
Embodiment 2:
A kind of high-nickel austenite nodular cast iron, described austenite ductile cast iron includes the change of following percetage by weight Study point: carbon 2.7%, silicon 2.0%, manganese 0.9%, phosphorus 0.04%, nickel 19.5%, chromium 1.9%, magnesium 0.065%, Surplus is ferrum.
A kind of high-nickel austenite nodular cast iron production technology, production technology comprises the following steps:
(1) dispensing prepares: according to the component preparation dispensing of following ratio of weight and number: the pig iron 150 parts, steel scrap 320 parts, carburant 11.5 parts, nickel plate 120 parts, chromic carbide iron 19.5 parts, 8.5 parts of ferromanganese, ferrosilicon 10 Part；
(2) intermediate frequency furnace melting: first the pig iron, steel scrap being loaded in stove, carburant joins electric furnace middle and lower part, Adding nickel plate, chromic carbide iron, ferromanganese, ferrosilicon after the pig iron, scrap melting, wherein nickel plate is after melting Phase adds, and ferromanganese, ferrosilicon are eventually adding before water outlet after base iron analysis；
(3) sample analysis: after molten iron is melting down, temperature reaches 1460 DEG C of sample analysis carried out above, according to molten iron Chemical composition requires to be adjusted, adjust qualified after, be warming up to 1510 DEG C, and in stove, add silicon, manganese enter Row deoxidation；
Wherein, molten iron studies and is divided into: carbon 2.80%, silicon 0.3%, manganese 0.04%, phosphorus 0.04%, nickel 19%, Chromium 1.9%, sulfur 0.01%, surplus is ferrum；
(4) water outlet nodularization: when temperature reaches 1550 DEG C, carry out coming out of the stove nodularization, and nodulizer uses nickel magnesium to close Gold, addition is 0.75%；
(5) inoculation: use the mode of three inoculation, uses silicon strontium inovulant when cast Carrying out current-following inoculation, wherein current-following inoculation addition is 0.15%, and granularity is 1mm；
(6) solution strengthening: for the austenite ductile cast iron of the Langaloy after inoculation at 900 DEG C More than using oil quenching to carry out intensive treatment, heating gradient is less than or equal to 150 DEG C/h, reaches in temperature It is incubated 4 hours after 950 DEG C, then carries out oil cold；
(7) Ageing Treatment: being heated by the austenite ductile cast iron after solution strengthening, heating gradient is less than Equal to 150 DEG C/h, after temperature reaches 635 DEG C, it is incubated 2 hours, and cools to 200 DEG C with the furnace, then Carry out air cooling.
Wherein, in dispensing preparation process, steel scrap uses pure punching press leftover pieces, and the pig iron uses the high-purity life in South Africa Ferrum, and all dispensings are all without greasy dirt, non-corroding, and keep being dried and clean conditions so that ferrum liquid is contained within The tension-active element of trace such as lead, arsenic etc., and without in rare earth element and time, it is to avoid broken shape graphite occurs, Intermediate frequency furnace melting step is added coverture carry out covering melting, coordinate and accelerate speed of melting so that melting Reducing ferrum liquid air-breathing in journey, and prevent furnace charge from putting up a bridge, in water outlet spheronization step, nodulizer does not contains rare earth, prevents In ferrum liquid, the rare earth element of residual makes graphite become block, in water outlet spheronization step nickel magnesium alloy by 16% magnesium With the nickel composition of 84%, the granularity of nickel magnesium alloy is 25 mesh, improves nodularization effect.
Austenite ductile cast iron mechanical performance and matrix that the present embodiment obtains are as shown in the table:
Embodiment 3:
A kind of high-nickel austenite nodular cast iron, described austenite ductile cast iron includes the change of following percetage by weight Study point: carbon 2.45%, silicon 1.5%, manganese 0.8%, phosphorus 0.03%, nickel 18.5%, chromium 1.85%, magnesium 0.06%, Surplus is ferrum.
A kind of high-nickel austenite nodular cast iron production technology, production technology comprises the following steps:
(1) dispensing prepares: according to the component preparation dispensing of following ratio of weight and number: the pig iron 150 parts, steel scrap 320 parts, carburant 11.5 parts, nickel plate 120 parts, chromic carbide iron 19.5 parts, 8.5 parts of ferromanganese, ferrosilicon 10 Part；
(2) intermediate frequency furnace melting: first the pig iron, steel scrap being loaded in stove, carburant joins electric furnace middle and lower part, Adding nickel plate, chromic carbide iron, ferromanganese, ferrosilicon after the pig iron, scrap melting, wherein nickel plate is after melting Phase adds, and ferromanganese, ferrosilicon are eventually adding before water outlet after base iron analysis；
(3) sample analysis: after molten iron is melting down, temperature reaches 1460 DEG C of sample analysis carried out above, according to molten iron Chemical composition requires to be adjusted, adjust qualified after, be warming up to 1510 DEG C, and in stove, add silicon, manganese enter Row deoxidation；
Wherein, molten iron studies and is divided into: carbon 2.65%, silicon 0.2%, manganese 0.03%, phosphorus 0.03%, nickel 18.5%, Chromium 1.85%, sulfur 0.01%, surplus is ferrum；
(4) water outlet nodularization: when temperature reaches 1545 DEG C, carry out coming out of the stove nodularization, and nodulizer uses nickel magnesium to close Gold, addition is 0.75%；
(5) inoculation: use the mode of three inoculation, uses silicon strontium inovulant when cast Carrying out current-following inoculation, wherein current-following inoculation addition is 0.15%, and granularity is 0.9mm；
(6) solution strengthening: for the austenite ductile cast iron of the Langaloy after inoculation at 900 DEG C More than using oil quenching to carry out intensive treatment, heating gradient is less than or equal to 150 DEG C/h, reaches in temperature It is incubated 4 hours after 950 DEG C, then carries out oil cold；
(7) Ageing Treatment: being heated by the austenite ductile cast iron after solution strengthening, heating gradient is less than Equal to 150 DEG C/h, after temperature reaches 635 DEG C, it is incubated 2 hours, and cools to 200 DEG C with the furnace, then Carry out air cooling.
Wherein, in dispensing preparation process, steel scrap uses pure punching press leftover pieces, and the pig iron uses the high-purity life in South Africa Ferrum, and all dispensings are all without greasy dirt, non-corroding, and keep being dried and clean conditions so that ferrum liquid is contained within The tension-active element of trace such as lead, arsenic etc., and without in rare earth element and time, it is to avoid broken shape graphite occurs, Intermediate frequency furnace melting step is added coverture carry out covering melting, coordinate and accelerate speed of melting so that melting Reducing ferrum liquid air-breathing in journey, and prevent furnace charge from putting up a bridge, in water outlet spheronization step, nodulizer does not contains rare earth, prevents In ferrum liquid, the rare earth element of residual makes graphite become block, in water outlet spheronization step nickel magnesium alloy by 15.5% magnesium With the nickel composition of 84.5%, the granularity of nickel magnesium alloy is 20 mesh, improves nodularization effect.
Austenite ductile cast iron mechanical performance and matrix that the present embodiment obtains are as shown in the table:
The present invention is by rational production technology, it is possible to obtains the foundry goods of qualified mechanical property and is suitable to long-term steady Fixed production, by the heat treatment mode of solution strengthening Yu Ageing Treatment, enhances matrix, and increases it Toughness, crystal grain thinning, eliminates segregation, reduces internal stress, makes tissue and performance more uniform, and makes The mechanical performance of austenite ductile cast iron, matrix meet the requirement of hot strength, yield strength.
The ultimate principle of the present invention, principal character and advantages of the present invention have more than been shown and described.The industry Skilled person will appreciate that, the present invention is not restricted to the described embodiments, in above-described embodiment and description The principle that the present invention is simply described described, without departing from the spirit and scope of the present invention, the present invention Also having various changes and modifications, these changes and improvements both fall within scope of the claimed invention.

Claims (6)

1. a high-nickel austenite nodular cast iron, it is characterised in that described austenite ductile cast iron include with The chemical composition of lower percetage by weight: carbon 2.35～2.7%, silicon 1.75～2.0%, manganese 0.7～0.9%, phosphorus is little In equal to 0.05%, nickel 18～19.5%, chromium 1.75～1.9%, magnesium 0.05～0.065%, surplus is ferrum.
2. a high-nickel austenite nodular cast iron production technology as claimed in claim 1, it is characterised in that Described production technology comprises the following steps:
(1) dispensing prepares: prepare dispensing according to the component of following ratio of weight and number: the pig iron 150 parts, useless Steel 320 parts, carburant 11.5 parts, nickel plate 120 parts, chromic carbide iron 19.5 parts, 8.5 parts of ferromanganese, silicon Ferrum 10 parts；
(2) intermediate frequency furnace melting: first the pig iron, steel scrap are loaded in stove, under carburant joins in electric furnace Portion, adds nickel plate, chromic carbide iron, ferromanganese, ferrosilicon after the pig iron, scrap melting, and wherein nickel plate exists The melting later stage adds, and ferromanganese, ferrosilicon are eventually adding before water outlet after base iron analysis；
(3) sample analysis: after molten iron is melting down, temperature reaches 1460 DEG C of sample analysis carried out above, according to ferrum Hydrochemical Composition require be adjusted, adjust qualified after, be warming up to 1510 DEG C, and in stove add silicon, Manganese carries out deoxidation；
Wherein, molten iron studies and is divided into: carbon 2.55～2.80%, and silicon is less than or equal to 0.4%, and manganese is less than or equal to 0.05%, phosphorus be less than or equal to 0.05%, nickel 18～19%, chromium 1.8～1.9%, sulfur be less than or equal to 0.02%, Surplus is ferrum；
(4) water outlet nodularization: when temperature reaches 1540～1550 DEG C, carry out coming out of the stove nodularization, and nodulizer is adopted With nickel magnesium alloy, addition is 0.75%；
(5) inoculation: use the mode of three inoculation, uses silicon strontium to breed when cast Agent carries out current-following inoculation, and wherein current-following inoculation addition is 0.15%, and granularity is 0.8～1mm；
(6) solution strengthening: the austenite ductile cast iron for the Langaloy after inoculation exists Using for more than 900 DEG C oil quenching to carry out intensive treatment, heating gradient is less than or equal to 150 DEG C/h, in temperature It is incubated 4 hours after reaching 950 DEG C, then carries out oil cold；
(7) Ageing Treatment: being heated by the austenite ductile cast iron after solution strengthening, heating gradient is little In equal to 150 DEG C/h, after temperature reaches 635 DEG C, it is incubated 2 hours, and cools to 200 DEG C with the furnace, Then air cooling is carried out.
A kind of high-nickel austenite nodular cast iron the most according to claim 2, it is characterised in that described In dispensing preparation process, steel scrap uses pure punching press leftover pieces, and the pig iron uses South Africa high-purity pig iron, and institute There is dispensing all without greasy dirt, non-corroding, and keep being dried and clean conditions.
A kind of high-nickel austenite nodular cast iron the most according to claim 2, it is characterised in that described Intermediate frequency furnace melting step is added coverture carry out covering melting.
A kind of high-nickel austenite nodular cast iron the most according to claim 2, it is characterised in that described In water outlet spheronization step, nodulizer does not contains rare earth.
A kind of high-nickel austenite nodular cast iron the most according to claim 2, it is characterised in that described In water outlet spheronization step nickel magnesium alloy by 15～the magnesium of 16% and 80～85% nickel form, the grain of nickel magnesium alloy Degree is 10～25 mesh.
CN201610567296.4A 2016-07-18 2016-07-18 High-nickel austenite nodular cast iron and production technique for same Pending CN105950959A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107502814A (en) * 2017-09-06 2017-12-22 马鞍山市万兴耐磨金属制造有限公司 The technique of high nickel cast iron rich chromium cast iron bi-material layers casting
CN109482815A (en) * 2018-12-21 2019-03-19 盐城市精工铸业股份有限公司 The casting technique of high-nickel austenite nodular cast iron valve-stem nut
CN114645185A (en) * 2020-12-18 2022-06-21 中国科学院沈阳科学仪器股份有限公司 Preparation method of corrosion-resistant and high-temperature-resistant high-nickel ductile iron
CN115450307A (en) * 2022-10-24 2022-12-09 安徽大来机械制造有限公司 Process for producing nodular cast iron grate

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Application publication date: 20160921