CN107022715A - A kind of heat treatment method of milling machine lathe bed - Google Patents
A kind of heat treatment method of milling machine lathe bed Download PDFInfo
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- CN107022715A CN107022715A CN201710288260.7A CN201710288260A CN107022715A CN 107022715 A CN107022715 A CN 107022715A CN 201710288260 A CN201710288260 A CN 201710288260A CN 107022715 A CN107022715 A CN 107022715A
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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
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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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- 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
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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
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- 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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Abstract
The invention discloses a kind of heat treatment method of milling machine lathe bed, the percentage by weight of described its composition of milling machine lathe bed is C3.2~3.7%, Si1.4~2.0%, Mn0.6~1.1%, V0.18~0.35%, Ti0.05~0.15%, Cu0.6~0.8%, P0.2~0.4%, S≤0.12%, and surplus is Fe.Described method includes dispensing, preheating, melting, both analysis, final deoxidizing, spheroidising and inoculation, cast, pearliteization processing.This method technique is simple, by controlling carbon in cast iron, silicon, vanadium, titanium, the addition of copper and spheroidising and pearliteization to handle, casts out high-performance anti-attrition spheroidal graphite cast-iron, is particularly suitable for casting milling machine lathe bed.
Description
Technical field
The present invention relates to the production technical field of ferrous metal, especially a kind of heat treatment method of milling machine lathe bed.
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.Vanadium titanium
Copper spheroidal graphite cast-iron is a kind of antifriction material of function admirable, and it has the spy of very high hardness and the service life of extension casting
Point.Add copper purpose be because copper can promote to form and refine pearlite matrix so that improve the intensity of cast iron, hardness and
Wearability.Vanadium, the element of titanium two and carbon nitrogen in vanadium titanium wear resistant cast iron have very big affinity.Form distinctive vanadium titanium carbon nitrification
Thing, these compounds have very high microhardness, and up to 960~1840HV is distributed in matrix in tiny Hard Inclusion
Among, greatly improve the Wear vesistance of cast iron.There is abundant vanadium titanium symbiotic iron ore resource in Southwestern China area.Make full use of me
The resources characteristic of state, therefore, develops vanadium titanium copper spheroidal graphite cast-iron, to extend the service life of casting.In addition, in order to improve titanium containing vanadium
The anti-attrition of copper spheroidal graphite cast-iron milling machine lathe bed, need to carry out pearlite processing.
The content of the invention
It is an object of the present invention in view of the above-mentioned problems, a kind of heat treatment method of milling machine lathe bed be proposed, by controlling to cast
Carbon, silicon, vanadium, titanium, the addition of copper and spheroidising and pearliteization processing, cast out the casting of high-performance anti-attrition spheroidal graphite in iron
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, ferromanganese, ferrosilicon, vanadium iron, ferrotianium, fine copper are pressed into C3.2~3.7%, Si1.4
~2.0%, Mn0.6~1.1%, V0.18~0.35%, Ti0.05~0.15%, Cu0.6~0.8%, P0.2~0.4%, S≤
0.12%, surplus carries out dispensing for the mode of Fe percentage by weights；
Second step：Preheating：Steel scrap, foundry returns, the pig iron that optimization is calculated put into intermediate frequency furnace and 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 17~
27%, composition carries out pre-deoxidation for the deoxidier of lime 70%+ fluorites 30%, then puts into ferromanganese, ferrosilicon, vanadium iron, the titanium of baking processing
Iron and fine copper, when molten iron temperature is warming up to 1490~1650 DEG C, adds 0.1% deslagging agent and once remove the gred, then covering and heat insulating agent etc.
Analysis to be sampled；
4th step：Both analysis：Molten iron 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：Molten iron temperature is warming up to 1490~1650 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：Molten iron flows to casting ladle from intermediate frequency furnace, in casting ladle carry out spheroidising,
Inoculation and secondary 1.2~1.4% nodulizers for removing Slag treatment, adding that its quantity is iron liquid amount, the granularity of nodulizer for 8~
26mm, nodulizer is FeSiMg8Re3；Add 1~1.2% inovulant that its quantity is iron water amount, the granularity of inovulant for 4~
8mm, inovulant is 75 ferrosilicon；Add cast triangle of being skimmed at once after 0.1% deslagging agent that its quantity is iron water amount, spheroidizing reacion
Poured into a mould after test piece and spectrometer analysis detection liquid iron balling and chemical composition are qualified；
7th step：Cast：1460~1500 DEG C of pouring temperature, as cast its quantity of addition is iron water 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 the spheroidal graphite of titanium copper containing vanadium
Iron milling machine bed casting；
8th step：Pearliteization processing.
In described the 8th step pearlite processing processing, below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to
950~970 DEG C, 4~6h of insulation is furnace-cooled to 750~780 DEG C, is incubated 5~6h, is furnace-cooled to 500 DEG C of air coolings of coming out of the stove, obtains titanium containing vanadium
Copper spheroidal graphite cast-iron milling machine lathe bed part.
The beneficial effects of the invention are as follows：Technique is simple, by controlling carbon in cast iron, silicon, vanadium, titanium, the addition of copper and ball
Change processing and pearliteization processing, cast out high-performance anti-attrition spheroidal graphite cast-iron, be particularly suitable for casting milling machine lathe bed.
Embodiment
Embodiment 1：
A kind of heat treatment method of milling machine lathe bed of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, vanadium iron, ferrotianium, fine copper by C3.2%, Si1.4%,
Mn0.6%, V0.18%, Ti0.05%, Cu0.6%, P0.2%, S≤0.12%, surplus carries out dispensing for the mode of Fe percentage by weights；
Second step：Preheating：Steel scrap, foundry returns, the pig iron that optimization is calculated put into intermediate frequency furnace and preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, its quantity is put into for furnace charge 17%, into
The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferrosilicon, vanadium iron, the ferrotianium and pure of baking processing
Copper, when molten iron temperature is warming up to 1490 DEG C, adds 0.1% deslagging agent and once removes the gred, then covering and heat insulating agent waits sampling analysis；
4th step：Both analysis：Molten iron 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：Molten iron temperature is warming up to 1490 DEG C, the aluminium that its quantity is iron liquid 0.1% is put into and carries out final deoxidizing；
6th step：Spheroidising and inoculation：Molten iron flows to casting ladle from intermediate frequency furnace, in casting ladle carry out spheroidising,
Inoculation and secondary 1.2% nodulizer for removing Slag treatment, adding that its quantity is iron liquid amount, the granularity of nodulizer is 8mm, nodularization
Agent is FeSiMg8Re3；1% inovulant that its quantity is iron water amount is added, the granularity of inovulant is 4mm, and inovulant is 75 ferrosilicon；
Add skimmed at once after 0.1% deslagging agent that its quantity is iron water amount, 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：1460 DEG C of pouring temperature, as cast adds 0.08% 2 that its quantity is iron water amount when casting ladle is poured into a mould
Secondary inovulant, the granularity of inovulant is 2mm, and inovulant is 75 ferrosilicon, obtains the spheroidal graphite cast-iron milling machine bed casting of titanium copper containing vanadium；
8th step：Pearliteization processing：Below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to 950 DEG C, insulation 4h is furnace-cooled to
750 DEG C, 5h is incubated, 500 DEG C of air coolings of coming out of the stove is furnace-cooled to, obtains the spheroidal graphite cast-iron milling machine lathe bed part of titanium copper containing vanadium.
Embodiment 2：
A kind of heat treatment method of milling machine lathe bed of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, vanadium iron, ferrotianium, fine copper by C3.45%, Si1.7%,
Mn0.85%, V0.265%, Ti0.10%, Cu0.7%, P0.3%, S≤0.12%, surplus is matched somebody with somebody for the mode of Fe percentage by weights
Material；
Second step：Preheating：Steel scrap, foundry returns, the pig iron that optimization is calculated put into intermediate frequency furnace and preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, its quantity is put into for furnace charge 22%, into
The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferrosilicon, vanadium iron, the ferrotianium and pure of baking processing
Copper, when molten iron temperature is warming up to 1570 DEG C, adds 0.1% deslagging agent and once removes the gred, then covering and heat insulating agent waits sampling analysis；
4th step：Both analysis：Molten iron 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：Molten iron temperature is warming up to 1570 DEG C, the aluminium that its quantity is iron liquid 0.2% is put into and carries out final deoxidizing；
6th step：Spheroidising and inoculation：Molten iron flows to casting ladle from intermediate frequency furnace, in casting ladle carry out spheroidising,
Inoculation and secondary 1.3% nodulizer for removing Slag treatment, adding that its quantity is iron liquid amount, the granularity of nodulizer is 17mm, nodularization
Agent is FeSiMg8Re3；1.1% inovulant that its quantity is iron water amount is added, the granularity of inovulant is 6mm, and inovulant is 75 silicon
Iron；Add skimmed at once after 0.1% deslagging agent that its quantity is iron water amount, 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：1480 DEG C of pouring temperature, as cast adds 0.12% 2 that its quantity is iron water amount when casting ladle is poured into a mould
Secondary inovulant, the granularity of inovulant is 4mm, and inovulant is 75 ferrosilicon, obtains the spheroidal graphite cast-iron milling machine bed casting of titanium copper containing vanadium；
8th step：Pearliteization processing：Below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to 960 DEG C, insulation 5h is furnace-cooled to
765 DEG C, 5.5h is incubated, 500 DEG C of air coolings of coming out of the stove is furnace-cooled to, obtains the spheroidal graphite cast-iron milling machine lathe bed part of titanium copper containing vanadium.
Embodiment 3：
A kind of heat treatment method of milling machine lathe bed of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, vanadium iron, ferrotianium, fine copper by C3.7%, Si2.0%,
Mn1.1%, V0.35%, Ti0.15%, Cu0.8%, P0.4%, S≤0.12%, surplus carries out dispensing for the mode of Fe percentage by weights；
Second step：Preheating：Steel scrap, foundry returns, the pig iron that optimization is calculated put into intermediate frequency furnace and preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, its quantity is put into for furnace charge 27%, into
The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferrosilicon, vanadium iron, the ferrotianium and pure of baking processing
Copper, when molten iron temperature is warming up to 1650 DEG C, adds 0.1% deslagging agent and once removes the gred, then covering and heat insulating agent waits sampling analysis；
4th step：Both analysis：Molten iron 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：Molten iron temperature is warming up to 1650 DEG C, the aluminium that its quantity is iron liquid 0.3% is put into and carries out final deoxidizing；
6th step：Spheroidising and inoculation：Molten iron flows to casting ladle from intermediate frequency furnace, in casting ladle carry out spheroidising,
Inoculation and secondary 1.4% nodulizer for removing Slag treatment, adding that its quantity is iron liquid amount, the granularity of nodulizer is 26mm, nodularization
Agent is FeSiMg8Re3；1.2% inovulant that its quantity is iron water amount is added, the granularity of inovulant is 8mm, and inovulant is 75 silicon
Iron；Add skimmed at once after 0.1% deslagging agent that its quantity is iron water amount, 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 0.16% 2 that its quantity is iron water amount when casting ladle is poured into a mould
Secondary inovulant, the granularity of inovulant is 6mm, and inovulant is 75 ferrosilicon, obtains the spheroidal graphite cast-iron milling machine bed casting of titanium copper containing vanadium；
8th step：Pearliteization processing：Below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to 970 DEG C, insulation 6h is furnace-cooled to
780 DEG C, 6h is incubated, 500 DEG C of air coolings of coming out of the stove is furnace-cooled to, obtains the spheroidal graphite cast-iron milling machine lathe bed part of titanium copper containing vanadium.
The embodiment to 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 modifications, equivalent substitutions and improvements etc., each fall within the Inner of protection scope of the present invention.
Embodiment 1：
A kind of method for preparing milling machine lathe bed of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, vanadium iron, ferrotianium, fine copper by C3.2%, Si1.4%,
Mn0.6%, V0.18%, Ti0.05%, Cu0.6%, P0.2%, S≤0.12%, surplus carries out dispensing for the mode of Fe percentage by weights；
Second step：Preheating：Steel scrap, foundry returns, the pig iron that optimization is calculated put into intermediate frequency furnace and preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, its quantity is put into for furnace charge 17%, into
The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferrosilicon, vanadium iron, the ferrotianium and pure of baking processing
Copper, when molten iron temperature is warming up to 1490 DEG C, adds 0.1% deslagging agent and once removes the gred, then covering and heat insulating agent waits sampling analysis；
4th step：Both analysis：Molten iron 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：Molten iron temperature is warming up to 1490 DEG C, the aluminium that its quantity is iron liquid 0.1% is put into and carries out final deoxidizing；
6th step：Spheroidising and inoculation：Molten iron flows to casting ladle from intermediate frequency furnace, in casting ladle carry out spheroidising,
Inoculation and secondary 1.2% nodulizer for removing Slag treatment, adding that its quantity is iron liquid amount, the granularity of nodulizer is 8mm, nodularization
Agent is FeSiMg8Re3；1% inovulant that its quantity is iron water amount is added, the granularity of inovulant is 4mm, and inovulant is 75 ferrosilicon；
Add skimmed at once after 0.1% deslagging agent that its quantity is iron water amount, 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：1460 DEG C of pouring temperature, as cast adds 0.08% 2 that its quantity is iron water amount when casting ladle is poured into a mould
Secondary inovulant, the granularity of inovulant is 2mm, and inovulant is 75 ferrosilicon, obtains the spheroidal graphite cast-iron milling machine bed casting of titanium copper containing vanadium.
Embodiment 2：
A kind of method for preparing milling machine lathe bed of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, vanadium iron, ferrotianium, fine copper by C3.45%, Si1.7%,
Mn0.85%, V0.265%, Ti0.10%, Cu0.7%, P0.3%, S≤0.12%, surplus is matched somebody with somebody for the mode of Fe percentage by weights
Material；
Second step：Preheating：Steel scrap, foundry returns, the pig iron that optimization is calculated put into intermediate frequency furnace and preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, its quantity is put into for furnace charge 22%, into
The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferrosilicon, vanadium iron, the ferrotianium and pure of baking processing
Copper, when molten iron temperature is warming up to 1570 DEG C, adds 0.1% deslagging agent and once removes the gred, then covering and heat insulating agent waits sampling analysis；
4th step：Both analysis：Molten iron 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：Molten iron temperature is warming up to 1570 DEG C, the aluminium that its quantity is iron liquid 0.2% is put into and carries out final deoxidizing；
6th step：Spheroidising and inoculation：Molten iron flows to casting ladle from intermediate frequency furnace, in casting ladle carry out spheroidising,
Inoculation and secondary 1.3% nodulizer for removing Slag treatment, adding that its quantity is iron liquid amount, the granularity of nodulizer is 17mm, nodularization
Agent is FeSiMg8Re3；1.1% inovulant that its quantity is iron water amount is added, the granularity of inovulant is 6mm, and inovulant is 75 silicon
Iron；Add skimmed at once after 0.1% deslagging agent that its quantity is iron water amount, 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：1480 DEG C of pouring temperature, as cast adds 0.12% 2 that its quantity is iron water amount when casting ladle is poured into a mould
Secondary inovulant, the granularity of inovulant is 4mm, and inovulant is 75 ferrosilicon, obtains the spheroidal graphite cast-iron milling machine bed casting of titanium copper containing vanadium.
Embodiment 3：
A kind of method for preparing milling machine lathe bed of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, vanadium iron, ferrotianium, fine copper by C3.7%, Si2.0%,
Mn1.1%, V0.35%, Ti0.15%, Cu0.8%, P0.4%, S≤0.12%, surplus carries out dispensing for the mode of Fe percentage by weights；
Second step：Preheating：Steel scrap, foundry returns, the pig iron that optimization is calculated put into intermediate frequency furnace and preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, its quantity is put into for furnace charge 27%, into
The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese, ferrosilicon, vanadium iron, the ferrotianium and pure of baking processing
Copper, when molten iron temperature is warming up to 1650 DEG C, adds 0.1% deslagging agent and once removes the gred, then covering and heat insulating agent waits sampling analysis；
4th step：Both analysis：Molten iron 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：Molten iron temperature is warming up to 1650 DEG C, the aluminium that its quantity is iron liquid 0.3% is put into and carries out final deoxidizing；
6th step：Spheroidising and inoculation：Molten iron flows to casting ladle from intermediate frequency furnace, in casting ladle carry out spheroidising,
Inoculation and secondary 1.4% nodulizer for removing Slag treatment, adding that its quantity is iron liquid amount, the granularity of nodulizer is 26mm, nodularization
Agent is FeSiMg8Re3；1.2% inovulant that its quantity is iron water amount is added, the granularity of inovulant is 8mm, and inovulant is 75 silicon
Iron；Add skimmed at once after 0.1% deslagging agent that its quantity is iron water amount, 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 0.16% 2 that its quantity is iron water amount when casting ladle is poured into a mould
Secondary inovulant, the granularity of inovulant is 6mm, and inovulant is 75 ferrosilicon, obtains the spheroidal graphite cast-iron milling machine bed casting of titanium copper containing vanadium.
Claims (2)
1. a kind of heat treatment method of milling machine lathe bed, it is characterised in that:Including following several steps：
The first step：Dispensing：Steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon, vanadium iron, ferrotianium, fine copper are pressed into C3.2~3.7%, Si1.4
~2.0%, Mn0.6~1.1%, V0.18~0.35%, Ti0.05~0.15%, Cu0.6~0.8%, P0.2~0.4%, S≤
0.12%, surplus carries out dispensing for the mode of Fe percentage by weights；
Second step：Preheating：Steel scrap, foundry returns, the pig iron that optimization is calculated put into intermediate frequency furnace and 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 17~
27%, composition carries out pre-deoxidation for the deoxidier of lime 70%+ fluorites 30%, then puts into ferromanganese, ferrosilicon, vanadium iron, the titanium of baking processing
Iron and fine copper, when molten iron temperature is warming up to 1490~1650 DEG C, adds 0.1% deslagging agent and once remove the gred, then covering and heat insulating agent etc.
Analysis to be sampled；
4th step：Both analysis：Molten iron 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：Molten iron temperature is warming up to 1490~1650 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：Molten iron flows to casting ladle from intermediate frequency furnace, in casting ladle carry out spheroidising,
Inoculation and secondary 1.2~1.4% nodulizers for removing Slag treatment, adding that its quantity is iron liquid amount, the granularity of nodulizer for 8~
26mm, nodulizer is FeSiMg8Re3；Add 1~1.2% inovulant that its quantity is iron water amount, the granularity of inovulant for 4~
8mm, inovulant is 75 ferrosilicon；Add cast triangle of being skimmed at once after 0.1% deslagging agent that its quantity is iron water amount, spheroidizing reacion
Poured into a mould after test piece and spectrometer analysis detection liquid iron balling and chemical composition are qualified；
7th step：Cast：1460~1500 DEG C of pouring temperature, as cast its quantity of addition is iron water 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 the spheroidal graphite of titanium copper containing vanadium
Iron milling machine bed casting；
8th step：Pearliteization processing.
2. a kind of heat treatment method of milling machine lathe bed according to claim 1, it is characterised in that：In the 8th described step pearl
In body of light processing processing, below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to 950~970 DEG C, is incubated 4~6h stoves
It is cooled to 750~780 DEG C, is incubated 5~6h, is furnace-cooled to 500 DEG C of air coolings of coming out of the stove, obtains the spheroidal graphite cast-iron milling machine of titanium copper containing vanadium lathe bed zero
Part.
Priority Applications (1)
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