CN106755917A - A kind of heat treatment method of cast-iron piston ring - Google Patents
A kind of heat treatment method of cast-iron piston ring Download PDFInfo
- Publication number
- CN106755917A CN106755917A CN201611165024.8A CN201611165024A CN106755917A CN 106755917 A CN106755917 A CN 106755917A CN 201611165024 A CN201611165024 A CN 201611165024A CN 106755917 A CN106755917 A CN 106755917A
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- iron
- cast
- treatment
- inovulant
- analysis
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Classifications
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a kind of heat treatment method of cast-iron piston ring, the percentage by weight of described its composition of cast-iron piston ring is C2.9~3.3%, Si2.2~2.4%, Mn0.8~1.1%, B0.04~0.06%, P0.3~0.45%, S≤0.08%, balance of Fe.Methods described includes dispensing, preheating, melting, both analysis, final deoxidizing, spheroidal graphite treatment and inoculation, cast, pearliteization treatment.The method smelting technology is simple, by controlling the addition of carbon in cast iron, silicon and boron and spheroidising and carrying out pearlite treatment, casts out high-performance anti-attrition spheroidal graphite cast-iron, while reducing production cost, is particularly suitable for cast pistons ring.
Description
Technical field
The present invention relates to the production technical field of ferrous metal, especially a kind of heat treatment method of cast-iron piston ring.
Background technology
China is begun to produce spheroidal graphite cast-iron from nineteen fifty, and abundant rare earth resources have been developed since adding for the seven's+,
Therefore the unique Rare-earth Elements Treated Nodular Iron of China has been developed on the basis of magnesium spheroidal graphite cast-iron, as important founding materials.Boracic
Spheroidal graphite cast-iron is a kind of antifriction material of function admirable, it have hardness very high and extension casting service life the characteristics of.
Need to only add boron, matrix hardly to change in cast iron containing boron spheroidal cast iron, simply occur one in austenite
Divide boron-carbide.Aobvious Cheng hardness HV=1100 higher due to boron-carbide or so, therefore Wear vesistance is improve, while boron carbon
Compound is uniformly distributed in the base, so not bringing many difficulties to processing characteristics.Therefore, boracic anti-attrition spheroidal graphite cast-iron is developed
To extend the service life of casting.In addition, the anti-attrition in order to improve boracic ductile iron piston ring, need to be carried out at pearlite
Reason.
The content of the invention
It is an object of the present invention to regarding to the issue above, a kind of cast-iron piston ring and preparation method thereof is proposed, by control
The addition of carbon in cast iron, silicon and boron and spheroidising and pearlite treatment is carried out, cast out the casting of high-performance anti-attrition spheroidal graphite
Iron.
The technical solution adopted for the present invention to solve the technical problems is：Including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, pure boron press C2.9~3.3%, Si2.2~2.4%,
Mn0.8~1.1%, B0.04~0.06%, P0.3~0.45%, S≤0.08%, the mode of balance of Fe percentage by weights are matched somebody with somebody
Material；
Second step：Preheating：Will optimize calculate steel scrap, foundry returns, the pig iron input intermediate frequency furnace in preheated；
3rd step：Melting：By the steel scrap in intermediate frequency furnace, foundry returns, the pig iron fusing after, put into its quantity for furnace charge 18~
28%, composition carries out pre-deoxidation for the deoxidier of lime 70%+ fluorites 30%, then puts into ferromanganese, ferrosilicon and pure boron that baking is processed,
When bonded hard ferrite magnet is warming up to 1400~1460 DEG C, add 0.1% deslagging agent once to remove the gred, be then covered by be sampled point of heat preserving agent etc.
Analysis；
4th step：Both analysis：Iron liquid is taken quickly to be analyzed with stokehold spectrometer analysis combination carbon silicon heat analysis, according to
Analysis result adjusts chemical composition；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up to 1480~1640 DEG C, the aluminium that its quantity is iron liquid 0.1~0.3% is put into
Carry out final deoxidizing；
6th step：Spheroidising and inoculation：Iron liquid flows to casting ladle from intermediate frequency furnace, carried out in casting ladle spheroidising,
Inoculation and secondary except Slag treatment, adds 1.2~1.4% nodulizers that its quantity is iron liquid amount, the granularity of nodulizer for 8~
26mm, nodulizer is FeSiMgRe3；Add 1~1.2% inovulant that its quantity is iron liquid amount, the granularity of inovulant for 4~
8mm, inovulant is 75 ferrosilicon；Add 0.1% deslagging agent that its quantity is iron liquid amount, cast triangle of being skimmed at once after spheroidizing reacion
Test piece and spectrometer analysis detect that liquid iron balling and chemical composition are poured into a mould after qualified；
7th step：Cast：1480~1520 DEG C of pouring temperature, as cast its quantity of addition is iron liquid amount when casting ladle is poured into a mould
0.08~0.16% post inoculant, the granularity of inovulant is 2~6mm, and inovulant is 75 ferrosilicon, obtains being lived containing boron spheroidal cast iron
Plug ring casting；
8th step：Pearliteization treatment.
In described the 8th step pearlite treatment treatment, below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to
910~930 DEG C, insulation 4~6h stoves are cooled to 710~730 DEG C, are incubated 5~6h, and stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains boracic ball
Black cast-iron piston shaped part.
The beneficial effects of the invention are as follows：Smelting technology is simple, by the addition and the nodularization that control carbon in cast iron, silicon and boron
Pearlite treatment is processed and carried out, high-performance anti-attrition spheroidal graphite cast-iron is cast out, while reducing production cost, is particularly suitable for casting
Make piston ring.
Specific embodiment
Embodiment 1：
A kind of heat treatment method of cast-iron piston ring of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, pure boron press C2.9%, Si2.2%, Mn0.8%,
B0.04%, P0.3%, S≤0.08%, the mode of balance of Fe percentage by weights carries out dispensing；
Second step：Preheating：Will optimize calculate steel scrap, foundry returns, the pig iron input intermediate frequency furnace in preheated；
3rd step：Melting：After by the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, its quantity is put into for furnace charge 18%, into
Being divided into the deoxidier of lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferrosilicon and pure boron that baking is processed, works as iron liquid
Temperature is warming up to 1400 DEG C, adds 0.1% deslagging agent once to remove the gred, and is then covered by heat preserving agent and waits sampling analysis；
4th step：Both analysis：Iron liquid is taken quickly to be analyzed with stokehold spectrometer analysis combination carbon silicon heat analysis, according to
Analysis result adjusts chemical composition；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up to 1480 DEG C, putting into the aluminium that its quantity is iron liquid 0.1% carries out final deoxidizing；
6th step：Spheroidising and inoculation：Iron liquid flows to casting ladle from intermediate frequency furnace, carried out in casting ladle spheroidising,
Inoculation and secondary except Slag treatment, adds 1.2% nodulizer that its quantity is iron liquid amount, and the granularity of nodulizer is 8mm, nodularization
Agent is FeSiMgRe3；1% inovulant that its quantity is iron liquid amount is added, the granularity of inovulant is 4mm, and inovulant is 75 ferrosilicon；
0.1% deslagging agent that its quantity is iron liquid amount is added, skimmed at once after spheroidizing reacion cast test wedge and spectrometer analysis detection
Poured into a mould after liquid iron balling and chemical composition are qualified；
7th step：Cast：1480 DEG C of pouring temperature, as cast adds 0.08% 2 that its quantity is iron liquid amount when casting ladle is poured into a mould
Secondary inovulant, the granularity of inovulant is 2mm, and inovulant is 75 ferrosilicon, obtains boracic ductile iron piston ring casting；
8th step：Pearliteization treatment.
In described the 8th step pearlite treatment treatment, below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to
910 DEG C, insulation 4h stoves are cooled to 710 DEG C, are incubated 5h, and stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains boracic ductile iron piston ring zero
Part.
Embodiment 2：
A kind of heat treatment method of cast-iron piston ring of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, pure boron press C3.1%, Si2.3%, Mn0.95%,
B0.05%, P0.375%, S≤0.08%, the mode of balance of Fe percentage by weights carries out dispensing；
Second step：Preheating：Will optimize calculate steel scrap, foundry returns, the pig iron input intermediate frequency furnace in preheated；
3rd step：Melting：After by the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, its quantity is put into for furnace charge 23%, into
Being divided into the deoxidier of lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferrosilicon and pure boron that baking is processed, works as iron liquid
Temperature is warming up to 1430 DEG C, adds 0.1% deslagging agent once to remove the gred, and is then covered by heat preserving agent and waits sampling analysis；
4th step：Both analysis：Iron liquid is taken quickly to be analyzed with stokehold spectrometer analysis combination carbon silicon heat analysis, according to
Analysis result adjusts chemical composition；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up to 1510 DEG C, putting into the aluminium that its quantity is iron liquid 0.2% carries out final deoxidizing；
6th step：Spheroidising and inoculation：Iron liquid flows to casting ladle from intermediate frequency furnace, carried out in casting ladle spheroidising,
Inoculation and secondary except Slag treatment, adds 1.3% nodulizer that its quantity is iron liquid amount, and the granularity of nodulizer is 17mm, nodularization
Agent is FeSiMgRe3；1.1% inovulant that its quantity is iron liquid amount is added, the granularity of inovulant is 6mm, and inovulant is 75 silicon
Iron；0.1% deslagging agent that its quantity is iron liquid amount is added, skimmed at once after spheroidizing reacion cast test wedge and spectrometer analysis
Poured into a mould after detection liquid iron balling and chemical composition are qualified；
7th step：Cast：1500 DEG C of pouring temperature, as cast adds 0.12% 2 that its quantity is iron liquid amount when casting ladle is poured into a mould
Secondary inovulant, the granularity of inovulant is 4mm, and inovulant is 75 ferrosilicon, obtains boracic ductile iron piston ring casting；
8th step：Pearliteization treatment.
In described the 8th step pearlite treatment treatment, below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to
920 DEG C, insulation 5h stoves are cooled to 720 DEG C, are incubated 5.5h, and stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains boracic ductile iron piston ring zero
Part.
Embodiment 3：
A kind of heat treatment method of cast-iron piston ring of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, pure boron press C3.3%, Si2.4%, Mn1.1%,
B0.06%, P0.45%, S≤0.08%, the mode of balance of Fe percentage by weights carries out dispensing；
Second step：Preheating：Will optimize calculate steel scrap, foundry returns, the pig iron input intermediate frequency furnace in preheated；
3rd step：Melting：After by the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, its quantity is put into for furnace charge 28%, into
Being divided into the deoxidier of lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferrosilicon and pure boron that baking is processed, works as iron liquid
Temperature is warming up to 1460 DEG C, adds 0.1% deslagging agent once to remove the gred, and is then covered by heat preserving agent and waits sampling analysis；
4th step：Both analysis：Iron liquid is taken quickly to be analyzed with stokehold spectrometer analysis combination carbon silicon heat analysis, according to
Analysis result adjusts chemical composition；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up to 1640 DEG C, putting into the aluminium that its quantity is iron liquid 0.1~0.3% carries out end
Deoxidation；
6th step：Spheroidising and inoculation：Iron liquid flows to casting ladle from intermediate frequency furnace, carried out in casting ladle spheroidising,
Inoculation and secondary except Slag treatment, adds 1.4% nodulizer that its quantity is iron liquid amount, and the granularity of nodulizer is 26mm, nodularization
Agent is FeSiMgRe3；1.2% inovulant that its quantity is iron liquid amount is added, the granularity of inovulant is 8mm, and inovulant is 75 silicon
Iron；0.1% deslagging agent that its quantity is iron liquid amount is added, skimmed at once after spheroidizing reacion cast test wedge and spectrometer analysis
Poured into a mould after detection liquid iron balling and chemical composition are qualified；
7th step：Cast：1520 DEG C of pouring temperature, as cast adds 0.16% 2 that its quantity is iron liquid amount when casting ladle is poured into a mould
Secondary inovulant, the granularity of inovulant is 6mm, and inovulant is 75 ferrosilicon, obtains boracic ductile iron piston ring casting；
8th step：Pearliteization treatment.
In described the 8th step pearlite treatment treatment, below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to
930 DEG C, insulation 6h stoves are cooled to 730 DEG C, are incubated 6h, and stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains boracic ductile iron piston ring zero
Part.
Specific embodiment of the invention is described above, but these explanations can not be considered as limiting the present invention
Scope, protection scope of the present invention limits by appended claims, Wang where appointing on the basis of the claims in the present invention
What modification, equivalent and improvement etc., each falls within the Inner of protection scope of the present invention.
Claims (2)
1. a kind of heat treatment method of cast-iron piston ring, it is characterised in that：Including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, pure boron press C2.9~3.3%, Si2.2~2.4%,
Mn0.8~1.1%, B0.04~0.06%, P0.3~0.45%, S≤0.08%, the mode of balance of Fe percentage by weights are matched somebody with somebody
Material；
Second step：Preheating：Will optimize calculate steel scrap, foundry returns, the pig iron input intermediate frequency furnace in preheated；
3rd step：Melting：By the steel scrap in intermediate frequency furnace, foundry returns, the pig iron fusing after, put into its quantity for furnace charge 18~
28%, composition carries out pre-deoxidation for the deoxidier of lime 70%+ fluorites 30%, then puts into ferromanganese, ferrosilicon and pure boron that baking is processed,
When bonded hard ferrite magnet is warming up to 1400~1460 DEG C, add 0.1% deslagging agent once to remove the gred, be then covered by be sampled point of heat preserving agent etc.
Analysis；
4th step：Both analysis：Iron liquid is taken quickly to be analyzed with stokehold spectrometer analysis combination carbon silicon heat analysis, according to
Analysis result adjusts chemical composition；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up to 1480~1640 DEG C, the aluminium that its quantity is iron liquid 0.1~0.3% is put into
Carry out final deoxidizing；
6th step：Spheroidising and inoculation：Iron liquid flows to casting ladle from intermediate frequency furnace, carried out in casting ladle spheroidising,
Inoculation and secondary except Slag treatment, adds 1.2~1.4% nodulizers that its quantity is iron liquid amount, the granularity of nodulizer for 8~
26mm, nodulizer is FeSiMgRe3；Add 1~1.2% inovulant that its quantity is iron liquid amount, the granularity of inovulant for 4~
8mm, inovulant is 75 ferrosilicon；Add 0.1% deslagging agent that its quantity is iron liquid amount, cast triangle of being skimmed at once after spheroidizing reacion
Test piece and spectrometer analysis detect that liquid iron balling and chemical composition are poured into a mould after qualified；
7th step：Cast：1480~1520 DEG C of pouring temperature, as cast its quantity of addition is iron liquid amount when casting ladle is poured into a mould
0.08~0.16% post inoculant, the granularity of inovulant is 2~6mm, and inovulant is 75 ferrosilicon, obtains being lived containing boron spheroidal cast iron
Plug ring casting；
8th step：Pearliteization treatment.
2. the heat treatment method of a kind of cast-iron piston ring according to claim 1, it is characterised in that：In the 8th described step
In pearlite treatment treatment, below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to 910~930 DEG C, is incubated 4~6h
Stove is cooled to 710~730 DEG C, is incubated 5~6h, and stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains boracic ductile iron piston ring part.
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Application publication date: 20170531 |