CN106676250A - Thermal treatment method for chilled cast iron roll - Google Patents

Thermal treatment method for chilled cast iron roll Download PDF

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Publication number
CN106676250A
CN106676250A CN201611158010.3A CN201611158010A CN106676250A CN 106676250 A CN106676250 A CN 106676250A CN 201611158010 A CN201611158010 A CN 201611158010A CN 106676250 A CN106676250 A CN 106676250A
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China
Prior art keywords
cast iron
iron
analysis
treatment method
chilled
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Pending
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CN201611158010.3A
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Chinese (zh)
Inventor
张鲁云
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Guangxi University
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Guangxi University
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Priority to CN201611158010.3A priority Critical patent/CN106676250A/en
Publication of CN106676250A publication Critical patent/CN106676250A/en
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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
    • C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
    • 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
    • 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)
  • Manufacturing Of Steel Electrode Plates (AREA)

Abstract

The invention discloses a thermal treatment method for a chilled cast iron roll. The chilled cast iron roll comprises, by weight, 2.8-3.7% of C, 0.6-1.3% of Si, 0.4-0.9% of Mn, no greater than 0.2% of P, no greater than 0.12% of S, and the balance Fe. The thermal treatment method comprises the steps of burdening, preheating, smelting, stokehold fast analyzing, final deoxidizing, inoculating, pouring and pearlizing treatment. According to the thermal treatment method, the casting process is simple, chilled cast iron is cast by controlling the amounts of carbon, silicon and phosphorus added into the cast iron, increasing the degree of superheat of molten iron and conducting pearlizing treatment, and the thermal treatment method is particularly suitable for casting the roll of a metallurgical mill.

Description

A kind of heat treatment method of chilled cast iron roll
Technical field
The present invention relates to the production technical field of ferrous metal, especially a kind of heat treatment method of chilled cast iron roll.
Background technology
Chilled cast iron roll is the most frequently used metallurgy rolling mill, and its consumption accounts for the 0.5% of product replacement.Roll works When, frictionally is rolled into steel billet, therefore roller surface must have hardness very high, while there is larger coefficient of friction, Therefore general outer layer is in white structure；It still suffers from very big bending stress simultaneously, therefore its heart must be grey mouth tissue, so that Roll has enough intensity and toughness.In addition, intensity and toughness in order to improve chilled cast iron roll, 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, propose a kind of heat treatment method of chilled cast iron roll.By control Carbon in cast iron processed, silicon, the addition of phosphorus and pearlite treatment is carried out, improve the wearability of chilled cast iron roll and have sufficiently strong Degree, toughness.
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 press C2.8~3.7%, Si0.6~1.3%, Mn0.4~0.9%, P≤ 0.2%th, S≤0.12%, 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：By the steel scrap in intermediate frequency furnace, foundry returns, the pig iron fusing after, put into its quantity for furnace charge 15~ 25%, composition carries out pre-deoxidation for the deoxidier of lime 60%+ fluorites 40%, when bonded hard ferrite magnet is warming up to 1550~1650 DEG C, adds 0.1% deslagging agent once removes 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 1580~1680 DEG C, the aluminium that its quantity is iron liquid 0.1~0.3% is put into Carry out final deoxidizing；
6th step：Inoculation：Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, and it is iron liquid amount to add its quantity 0.3~0.5% inovulant, the granularity of inovulant is 2~6mm, and inovulant is 75 ferrosilicon；
7th step：Cast：When bonded hard ferrite magnet is down to 1550~1650 DEG C, poured into a mould, obtained casting for making cast iron chilled rolls part.
8th step：Pearliteization treatment.
In described 8th step pearliteization treatment, below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, it 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 chilled cast iron and roll Roller part.
The beneficial effects of the invention are as follows：Casting technique is simple, by controlling carbon in cast iron, silicon, the addition of phosphorus and raising The molten iron degree of superheat and carry out pearliteization treatment cast out chilled cast iron, be particularly suitable for cast metallurgy rolling mill roll.
Specific embodiment
Embodiment 1：
A kind of heat treatment method of chilled cast iron roll of this example, including following several steps：
The first step：Dispensing：Steel scrap, foundry returns, the pig iron are pressed into C2.8%, Si0.6%, Mn0.4%, P≤0.2%, S≤0.12%, surplus For the mode 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 15%, into The deoxidier for being divided into lime 60%+ fluorites 40% carries out pre-deoxidation, when bonded hard ferrite magnet is warming up to 1550 DEG C, adds 0.1% deslagging agent one Secondary slagging-off, 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 1580 DEG C, putting into the aluminium that its quantity is iron liquid 0.1% carries out final deoxidizing；
6th step：Inoculation：Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, and it is iron liquid amount to add its quantity 0.3% inovulant, the granularity of inovulant is 2mm, and inovulant is 75 ferrosilicon；
7th step：Cast：When bonded hard ferrite magnet is down to 1550 DEG C, poured into a mould, obtained casting for making cast iron chilled rolls part；
8th step：Pearliteization treatment：Below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to 910 DEG C, and insulation 4h stoves are cooled to 710 DEG C, 5h is incubated, stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains chilled cast iron roll part.
Embodiment 2：
A kind of heat treatment method of chilled cast iron roll of this example, including following several steps：
The first step：Dispensing：Steel scrap, foundry returns, the pig iron are pressed into C3.25%, Si0.95%, Mn0.65%, P≤0.2%, S≤0.12%, 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 20%, into The deoxidier for being divided into lime 60%+ fluorites 40% carries out pre-deoxidation, when bonded hard ferrite magnet is warming up to 1600 DEG C, adds 0.1% deslagging agent one Secondary slagging-off, 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 1630 DEG C, putting into the aluminium that its quantity is iron liquid 0.2% carries out final deoxidizing；
6th step：Inoculation：Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, and it is iron liquid amount to add its quantity 0.4% inovulant, the granularity of inovulant is 4mm, and inovulant is 75 ferrosilicon；
7th step：Cast：When bonded hard ferrite magnet is down to 1600 DEG C, poured into a mould, obtained casting for making cast iron chilled rolls part；
8th step：Pearliteization treatment：Below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to 920 DEG C, and insulation 5h stoves are cooled to 720 DEG C, 5.5h is incubated, stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains chilled cast iron roll part.
Embodiment 3：
A kind of heat treatment method of chilled cast iron roll of this example, including following several steps：
The first step：Dispensing：Steel scrap, foundry returns, the pig iron are pressed into C3.7%, Si1.3%, Mn0.9%, P≤0.2%, S≤0.12%, surplus For the mode 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 25%, into The deoxidier for being divided into lime 60%+ fluorites 40% carries out pre-deoxidation, when bonded hard ferrite magnet is warming up to 1650 DEG C, adds 0.1% deslagging agent one Secondary slagging-off, 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 1680 DEG C, putting into the aluminium that its quantity is iron liquid 0.3% carries out final deoxidizing；
6th step：Inoculation：Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, and it is iron liquid amount to add its quantity 0.5% inovulant, the granularity of inovulant is 6mm, and inovulant is 75 ferrosilicon；
7th step：Cast：When bonded hard ferrite magnet is down to 1650 DEG C, poured into a mould, obtained casting for making cast iron chilled rolls part；
8th step：Pearliteization treatment：Below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to 930 DEG C, and insulation 6h stoves are cooled to 730 DEG C, 6h is incubated, stove is cooled to 500 DEG C of air coolings of coming out of the stove, obtains chilled cast iron roll 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 chilled cast iron roll, it is characterised in that：Including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron press C2.8~3.7%, Si0.6~1.3%, Mn0.4~0.9%, P≤ 0.2%th, S≤0.12%, 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：By the steel scrap in intermediate frequency furnace, foundry returns, the pig iron fusing after, put into its quantity for furnace charge 15~ 25%, composition carries out pre-deoxidation for the deoxidier of lime 60%+ fluorites 40%, when bonded hard ferrite magnet is warming up to 1550~1650 DEG C, adds 0.1% deslagging agent once removes 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 1580~1680 DEG C, the aluminium that its quantity is iron liquid 0.1~0.3% is put into Carry out final deoxidizing；
6th step：Inoculation：Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, and it is iron liquid amount to add its quantity 0.3~0.5% inovulant, the granularity of inovulant is 2~6mm, and inovulant is 75 ferrosilicon；
7th step：Cast：When bonded hard ferrite magnet is down to 1550~1650 DEG C, poured into a mould, obtained casting for making cast iron chilled rolls part；
8th step：Pearliteization treatment.
2. the heat treatment method of a kind of chilled cast iron roll according to claim 1, it is characterised in that：The described the 8th In step pearlite treatment treatment, below 200 DEG C of casting ﹤ is fitted into heat-treatment furnace, is warming up to 910~930 DEG C, it is incubated 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 chilled cast iron roll part.
CN201611158010.3A 2016-12-15 2016-12-15 Thermal treatment method for chilled cast iron roll Pending CN106676250A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108359774A (en) * 2018-03-20 2018-08-03 湖州中杭轧辊有限公司 A kind of production technology improving chilled cast iron ribbon steel working roll comprehensive performance

Citations (6)

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Publication number Priority date Publication date Assignee Title
CN87102216A (en) * 1986-03-20 1987-09-30 乔治·贵希尔股份公司 The production method of pearlitic cast iron
CN101148074A (en) * 2007-11-12 2008-03-26 大连宝锋机器制造有限公司 Roller and its forming technology
CN101289725A (en) * 2008-06-03 2008-10-22 襄汾县恒泰制动器有限公司 Process for producing gray cast iron with high carbon equivalent, low alloy and middle-high strength
CN101537427A (en) * 2009-04-28 2009-09-23 江苏环立板带轧辊有限公司 Composite roll for centrifugally casting high-chromium cast iron and a preparation method thereof
CN102699313A (en) * 2012-06-27 2012-10-03 江苏金源锻造股份有限公司 Method for manufacturing high-speed cold roll
CN103602879A (en) * 2013-12-02 2014-02-26 丹阳市锦雄机械制造有限公司 Preparation method for high strength gray cast iron material

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Publication number Priority date Publication date Assignee Title
CN87102216A (en) * 1986-03-20 1987-09-30 乔治·贵希尔股份公司 The production method of pearlitic cast iron
CN101148074A (en) * 2007-11-12 2008-03-26 大连宝锋机器制造有限公司 Roller and its forming technology
CN101289725A (en) * 2008-06-03 2008-10-22 襄汾县恒泰制动器有限公司 Process for producing gray cast iron with high carbon equivalent, low alloy and middle-high strength
CN101537427A (en) * 2009-04-28 2009-09-23 江苏环立板带轧辊有限公司 Composite roll for centrifugally casting high-chromium cast iron and a preparation method thereof
CN102699313A (en) * 2012-06-27 2012-10-03 江苏金源锻造股份有限公司 Method for manufacturing high-speed cold roll
CN103602879A (en) * 2013-12-02 2014-02-26 丹阳市锦雄机械制造有限公司 Preparation method for high strength gray cast iron material

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108359774A (en) * 2018-03-20 2018-08-03 湖州中杭轧辊有限公司 A kind of production technology improving chilled cast iron ribbon steel working roll comprehensive performance

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Application publication date: 20170517