CN106636867A - Thermal treatment method of spheroidal graphite cast iron worm wheel - Google Patents
Thermal treatment method of spheroidal graphite cast iron worm wheel Download PDFInfo
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- CN106636867A CN106636867A CN201611150128.1A CN201611150128A CN106636867A CN 106636867 A CN106636867 A CN 106636867A CN 201611150128 A CN201611150128 A CN 201611150128A CN 106636867 A CN106636867 A CN 106636867A
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- iron
- spheroidal graphite
- graphite cast
- inovulant
- cast
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Classifications
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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
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- 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
- 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
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- 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
-
- 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
- C21D2211/009—Pearlite
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials 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 invention discloses a thermal treatment method of a spheroidal graphite cast iron worm wheel. The spheroidal graphite cast iron worm comprises the following components in percentages by weight: 3.8-4.5% of C, 2.0-2.5% of Si, 0.2-0.4% of Mn, less than 0.08-0.07% of P, less than or equal to 0.02% of S and the balance of Fe. The method comprises the steps: proportioning; preheating; smelting; ladle analysis; final deoxidation; spheroidal graphite treatment and inoculation; pouring; and pearlite treatment. The thermal treatment method is simple. The wear resistance of spheroidal graphite cast iron is improved by virtue of strictly controlling the adding amount of carbon and silicon in the spheroidal graphite cast iron and by means of spheroidizing treatment and pearlite treatment. The method is particularly suitable for casting a worm wheel of a filter cloth-free vacuum filter.
Description
Technical field
The present invention relates to the production technical field of ferrous metal, especially a kind of heat treatment method of spheroidal graphite cast-iron worm gear.
Background technology
China begins to produce spheroidal graphite cast-iron from nineteen fifty, and abundant rare earth resources have been developed since adding for the seven's+,
Therefore developed the unique Rare-earth Elements Treated Nodular Iron of China on the basis of magnesium spheroidal graphite cast-iron, current use range throughout automobile,
Agricultural machinery, ship, metallurgy, chemical industry, sugared machine etc., become important founding materials.Pearlite ductile iron has good wearability,
Therefore it is very suitable to do axial workpiece and gear etc..Known sugar refinery's no filter-fabric vacuum is inhaled the worm gear of worry machine and is cast using grey cast-iron
Make, grey cast-iron wears no resistance, have a strong impact on sugar refinery and continuously produce.
In order to improve the wearability of spheroidal graphite cast-iron worm gear, pearlite process need to be carried out.
The content of the invention
It is an object of the present invention to be directed to the problems referred to above, a kind of heat treatment method of spheroidal graphite cast-iron worm gear is proposed.By control
Carbon, the addition of silicon and spheroidising and pearliteization are processed in spheroidal graphite cast-iron processed, cast out the spheroidal graphite casting of high-performance abrasion-proof
Iron.
The technical solution adopted for the present invention to solve the technical problems is：Including following several steps：
The first step：Dispensing：Steel scrap, foundry returns, the pig iron, ferrosilicon are pressed into C3.8～4.5%, Si2.0～2.5%, Mn0.2～0.4%, P
﹤ 0.08～0.07%, S≤0.02%, the mode of balance of Fe percentage by weights carries out dispensing；
Second step：Preheating：By optimization 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 12～
20%, composition carries out pre-deoxidation for the deoxidier of lime 70%+ fluorites 30%, then puts into ferromanganese, ferronickel and ferrosilicon that baking is processed,
When bonded hard ferrite magnet is warming up to 1350～1380 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：Take iron liquid stokehold spectrometer analysis quickly to be analyzed with reference to carbon silicon heat analysis, according to
Analysis result adjusts chemical composition；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up into 1500～1600 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, carry out in casting ladle spheroidising,
Inoculation and secondary except Slag treatment, adds 1.2～1.4% nodulizers that its quantity is iron liquid amount, and the granularity of nodulizer is 8～
26mm, nodulizer is FeSiMgRe3；Adding 1～1.2% inovulant that its quantity is iron liquid amount, the granularity of inovulant is 4～
8mm, inovulant is 75 ferrosilicon；Add 0.1% deslagging agent that its quantity is iron liquid amount, cast triangle of skimming 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：1350～1400 DEG C of pouring temperature, as cast adds its quantity for 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 the casting of spheroidal graphite cast-iron worm gear
Part；
8th step：Pearlite process is processed.
During the 8th described step pearlite process is processed, below 200 DEG C of foundry goods ﹤ is fitted into heat-treatment furnace, is warming up to 920
～940 DEG C, insulation 5～6h stoves are cooled to 730～740 DEG C, are incubated 5～6h, and stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains spheroidal graphite cast-iron
Worm gear part.
The invention has the beneficial effects as follows：Heat treatment method is simple, by strict control spheroidal graphite carbon in cast iron, the addition of silicon
With spheroidising and carry out pearlite process, improve spheroidal graphite cast-iron wearability, be particularly suitable for casting no filter-fabric vacuum suction filter
The worm gear of machine.
Specific embodiment
Embodiment 1：
A kind of heat treatment method of spheroidal graphite cast-iron worm gear of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferrosilicon press C3.8%, Si2.0%, Mn0.2%, P ﹤ 0.08%, S≤
0.02%, the mode of balance of Fe percentage by weights carries out dispensing；
Second step：Preheating：By optimization 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, it is furnace charge 12% to put into its quantity, into
Being divided into the deoxidier of lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferronickel and ferrosilicon that baking is processed, works as iron liquid
Temperature is warming up to 1350 DEG C, adds 0.1% deslagging agent once to remove the gred, and is then covered by heat preserving agent and waits sample analysis；
4th step：Both analysis：Take iron liquid stokehold spectrometer analysis quickly to be analyzed with reference to carbon silicon heat analysis, according to
Analysis result adjusts chemical composition；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up into 1500 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, carry 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, skim 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：1350 DEG C of pouring temperature, as cast adds its quantity for the 0.08% 2 of 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 spheroidal graphite cast-iron worm gear foundry goods；
8th step：Pearliteization process：Below 200 DEG C of spheroidal graphite cast-iron worm gear foundry goods ﹤ is fitted into heat-treatment furnace, is warming up to 920 DEG C,
Insulation 5h stoves are cooled to 730 DEG C, are incubated 5h, and stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains spheroidal graphite cast-iron worm gear part.
Embodiment 2：
A kind of heat treatment method of spheroidal graphite cast-iron worm gear of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferrosilicon press C4.15%, Si2.25%, Mn0.3%, P ﹤ 0.075%, S≤
0.02%, the mode of balance of Fe percentage by weights carries out dispensing；
Second step：Preheating：By optimization 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, it is furnace charge 16% to put into its quantity, into
Being divided into the deoxidier of lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferronickel and ferrosilicon that baking is processed, works as iron liquid
Temperature is warming up to 1365 DEG C, adds 0.1% deslagging agent once to remove the gred, and is then covered by heat preserving agent and waits sample analysis；
4th step：Both analysis：Take iron liquid stokehold spectrometer analysis quickly to be analyzed with reference to carbon silicon heat analysis, according to
Analysis result adjusts chemical composition；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up into 1550 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, carry 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, skim 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：1375 DEG C of pouring temperature, as cast adds its quantity for the 0.12% 2 of 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 spheroidal graphite cast-iron worm gear foundry goods；
8th step：Pearliteization process：Below 200 DEG C of spheroidal graphite cast-iron worm gear foundry goods ﹤ is fitted into heat-treatment furnace, is warming up to 930 DEG C,
Insulation 5.5h stoves are cooled to 735 DEG C, are incubated 5.5h, and stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains spheroidal graphite cast-iron worm gear part.
Embodiment 3：
A kind of heat treatment method of spheroidal graphite cast-iron worm gear of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferrosilicon press C4.5%, Si2.5%, Mn0.4%, P ﹤ 0.07%, S≤
0.02%, the mode of balance of Fe percentage by weights carries out dispensing；
Second step：Preheating：By optimization 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, it is furnace charge 20% to put into its quantity, into
Being divided into the deoxidier of lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferronickel and ferrosilicon that baking is processed, works as iron liquid
Temperature is warming up to 1380 DEG C, adds 0.1% deslagging agent once to remove the gred, and is then covered by heat preserving agent and waits sample analysis；
4th step：Both analysis：Take iron liquid stokehold spectrometer analysis quickly to be analyzed with reference to carbon silicon heat analysis, according to
Analysis result adjusts chemical composition；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up into 1600 DEG C, putting into the aluminium that its quantity is iron liquid 0.3% carries out final deoxidizing；
6th step：Spheroidising and inoculation：Iron liquid flows to casting ladle from intermediate frequency furnace, carry 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, skim 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：1400 DEG C of pouring temperature, as cast adds its quantity for the 0.16% 2 of 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 spheroidal graphite cast-iron worm gear foundry goods；
8th step：Pearliteization process：Below 200 DEG C of spheroidal graphite cast-iron worm gear foundry goods ﹤ is fitted into heat-treatment furnace, is warming up to 940 DEG C,
Insulation 6h stoves are cooled to 740 DEG C, are incubated 6h, and stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains spheroidal graphite cast-iron worm gear part.
The specific embodiment of the present 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. the heat treatment method that a kind of spheroidal graphite cast-iron Snail takes turns, it is characterised in that:Including following several steps：
The first step：Dispensing：Steel scrap, foundry returns, the pig iron, ferrosilicon are pressed into C3.8～4.5%, Si2.0～2.5%, Mn0.2～0.4%, P
﹤ 0.08～0.07%, S≤0.02%, the mode of balance of Fe percentage by weights carries out dispensing；
Second step：Preheating：By optimization 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 12～
20%, composition carries out pre-deoxidation for the deoxidier of lime 70%+ fluorites 30%, then puts into ferromanganese, ferronickel and ferrosilicon that baking is processed,
When bonded hard ferrite magnet is warming up to 1350～1380 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：Take iron liquid stokehold spectrometer analysis quickly to be analyzed with reference to carbon silicon heat analysis, according to
Analysis result adjusts chemical composition；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up into 1500～1600 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, carry out in casting ladle spheroidising,
Inoculation and secondary except Slag treatment, adds 1.2～1.4% nodulizers that its quantity is iron liquid amount, and the granularity of nodulizer is 8～
26mm, nodulizer is FeSiMgRe3；Adding 1～1.2% inovulant that its quantity is iron liquid amount, the granularity of inovulant is 4～
8mm, inovulant is 75 ferrosilicon；Add 0.1% deslagging agent that its quantity is iron liquid amount, cast triangle of skimming 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：1350～1400 DEG C of pouring temperature, as cast adds its quantity for 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 the casting of spheroidal graphite cast-iron worm gear
Part；
8th step：Pearliteization process.
2. the heat treatment method of a kind of spheroidal graphite cast-iron worm gear according to claim 1, it is characterised in that：The described the 8th
During step pearlite process is processed, below 200 DEG C of foundry goods ﹤ is fitted into heat-treatment furnace, is warming up to 920～940 DEG C, it is incubated 5～
6h stoves are cooled to 730～740 DEG C, are incubated 5～6h, and stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains spheroidal graphite cast-iron worm gear part.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107214305A (en) * | 2017-05-18 | 2017-09-29 | 冯兴平 | A kind of casting technique of brake block and its steel back |
| CN107760981A (en) * | 2017-10-23 | 2018-03-06 | 广东现代铸造有限公司 | A kind of spheroidal graphite cast-iron for bed piece and preparation method thereof |
| CN112063915A (en) * | 2020-09-16 | 2020-12-11 | 宁德际福机械制造有限公司 | QT700-8 nodular iron casting for automobile accessory production and production process thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107214305A (en) * | 2017-05-18 | 2017-09-29 | 冯兴平 | A kind of casting technique of brake block and its steel back |
| CN107214305B (en) * | 2017-05-18 | 2019-11-15 | 烟台兴创汽车配件有限公司 | A kind of brake block |
| CN107760981A (en) * | 2017-10-23 | 2018-03-06 | 广东现代铸造有限公司 | A kind of spheroidal graphite cast-iron for bed piece and preparation method thereof |
| CN112063915A (en) * | 2020-09-16 | 2020-12-11 | 宁德际福机械制造有限公司 | QT700-8 nodular iron casting for automobile accessory production and production process thereof |
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Application publication date: 20170510 |