CN106521306A - Heat treatment method for Cr-Mo wear-resistant cast iron - Google Patents
Heat treatment method for Cr-Mo wear-resistant cast iron Download PDFInfo
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- CN106521306A CN106521306A CN201610953613.6A CN201610953613A CN106521306A CN 106521306 A CN106521306 A CN 106521306A CN 201610953613 A CN201610953613 A CN 201610953613A CN 106521306 A CN106521306 A CN 106521306A
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- iron
- cast iron
- resistant cast
- wear resistant
- furnace
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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
- C22C37/10—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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C22C37/06—Cast-iron alloys containing chromium
-
- 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)
- Materials Engineering (AREA)
- Mechanical 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 heat treatment method for Cr-Mo wear-resistant cast iron. The Cr-Mo wear-resistant cast iron is prepared from components in percentage by weight as follows: 2.8%-3.8% of C, 1.65%-2.7% of Si, 0.5%-1.2% of Mn, 0.12%-0.7% of P, 0.2%-0.5% of Cr, 0.3%-0.8% of Mo, less than or equal to 0.09% of S and the balance of Fe. The method comprises steps of mixing, preheating, smelting, quick on-the-spot sample analysis, final deoxidation, inoculation treatment, pouring and high temperature annealing. The method is simple, through strict control on addition amounts of Cr and Mo, the structure can be refined remarkably, the comprehensive performance such as the mechanical strength, the wear resistance, the heat resistance and the like can be improved, the mechanical performance of the cast iron can reach the HT250 mark, meanwhile, the mechanical performance and the machinability are improved, and the cast iron is particularly suitable for casting of air cylinders, piston rings and tappets.
Description
Technical field
The present invention relates to the production technical field of ferrous metal, especially a kind of heat treatment method of chrome molybdenum wear resistant cast iron.
Background technology
Chrome molybdenum wear resistant cast iron is a kind of antifriction material of function admirable, and it has very high hardness and extends the use of foundry goods
The characteristics of life-span.During as anti-attrition cast iron, general chrome content is below 0.5%, it is to avoid free carbide occur, and often and molybdenum
Compound use.Molybdenum can reduce sensitivity profile, make the microstructure homogenization of different section, keep high intensity and height hard containing molybdenum cast iron
That what is spent is same, still with preferable toughness and cutting additivity.In addition to eliminating free cementite, hardness is reduced, improve machinery
Performance and machinability, need to carry out the high temperature anneal.
The content of the invention
The technical problem solved needed for of the invention is to provide a kind of heat treatment method of chrome molybdenum wear resistant cast iron.By controlling casting
The addition of chromium and molybdenum in iron, casting out wear resistant cast iron, and carry out high annealing improves mechanical performance and machinability.
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 press C2.8～3.8%, Si1.65～2.7%, Mn0.5～
1.2%th, P0.12～0.7%, Cr0.2～0.5%, Mo0.3～0.8%, S≤0.09%, the mode of balance of Fe percentage by weights enter
Row 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, put into its quantity for furnace charge 18～
29%, composition carries out pre-deoxidation for the deoxidier of lime 70%+ fluorites 30%, then puts into ferromanganese that baking processes and ferrosilicon obtains iron
Liquid；
4th step：Both analysis：Take iron liquid casting sample quickly to be analyzed, chemical composition is adjusted according to analysis result；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up to 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：Inoculation：Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, adds its quantity to be iron liquid amount
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 1440～1520 DEG C, is poured into a mould, obtained foundry goods；
8th step：High annealing.
In the 8th described step high annealing, load in heat-treatment furnace, with the speed of 70～90 DEG C/h below 200 DEG C of foundry goods
Degree is warming up to 745～820 DEG C, and 2～4h is when carrying out being quickly cooled to 520 DEG C for insulation, then foundry goods is put into into heat-treatment furnace with 60～
The speed of 90 DEG C/h is cooled to less than 300 DEG C air coolings of coming out of the stove, and obtains chrome molybdenum wear resistant cast iron.
The invention has the beneficial effects as follows：Method is simple, by strict control chromium, the addition of molybdenum, can significantly change tissue,
The combination property such as mechanical strength, wear-resisting, heat-resisting is put forward, its mechanical performance is up to the HT250 trades mark, while improving mechanical performance and cutting
Processing characteristics is cut, is particularly suitable for casting cylinder, piston ring and tappet.
Specific embodiment
Embodiment 1：
A kind of heat treatment method of chrome molybdenum wear resistant cast iron of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon press C2.8%, Si1.65%, Mn0.5%, P0.12%,
Cr0.2%, Mo0.3%, S≤0.09%, 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 18% to put into its quantity, into
The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese that baking processes and ferrosilicon obtains iron liquid；
4th step：Both analysis：Take iron liquid casting sample quickly to be analyzed, chemical composition is adjusted according to analysis result；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up to into 1500 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, adds its quantity to be iron liquid amount
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 1440 DEG C, is poured into a mould, obtained foundry goods；
8th step：High annealing：Load in heat-treatment furnace below 200 DEG C of foundry goods, 745 DEG C are warming up to the speed of 70 DEG C/h, protect
When warm 2h carries out being quickly cooled to 520 DEG C, then foundry goods is put into into heat-treatment furnace it is cooled to less than 300 DEG C with the speed of 60 DEG C/h and come out of the stove
Air cooling, obtains chrome molybdenum wear resistant cast iron.
Embodiment 2：
A kind of heat treatment method of chrome molybdenum wear resistant cast iron of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon press C3.3%, Si2.175%, Mn0.85%, P0.41%,
Cr0.35%, Mo0.55%, S≤0.09%, 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 22% to put into its quantity, into
The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese that baking processes and ferrosilicon obtains iron liquid；
4th step：Both analysis：Take iron liquid casting sample quickly to be analyzed, chemical composition is adjusted according to analysis result；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up to into 1550 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, adds its quantity to be iron liquid amount
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 1480 DEG C, is poured into a mould, obtained foundry goods；
8th step：High annealing：Load in heat-treatment furnace below 200 DEG C of foundry goods, 780 DEG C are warming up to the speed of 80 DEG C/h, protect
When warm 3h carries out being quickly cooled to 520 DEG C, then foundry goods is put into into heat-treatment furnace it is cooled to less than 300 DEG C with the speed of 75 DEG C/h and come out of the stove
Air cooling, obtains chrome molybdenum wear resistant cast iron.
Embodiment 3：
A kind of heat treatment method of chrome molybdenum wear resistant cast iron of this example, including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon press C3.8%, Si2.7%, Mn1.2%, P0.7%,
Cr0.5%, Mo0.8%, S≤0.09%, 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 29% to put into its quantity, into
The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese that baking processes and ferrosilicon obtains iron liquid；
4th step：Both analysis：Take iron liquid casting sample quickly to be analyzed, chemical composition is adjusted according to analysis result；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up to into 1600 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, adds its quantity to be iron liquid amount
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 1440 DEG C, is poured into a mould, obtained foundry goods；
8th step：High annealing：Load in heat-treatment furnace below 200 DEG C of foundry goods, 820 DEG C are warming up to the speed of 90 DEG C/h, protect
When warm 4h carries out being quickly cooled to 520 DEG C, then foundry goods is put into into heat-treatment furnace it is cooled to less than 300 DEG C with the speed of 90 DEG C/h and come out of the stove
Air cooling, obtains chrome molybdenum wear resistant cast iron.
Above the specific embodiment of the present invention is described, but these explanations can not be considered as limiting the present invention
Scope, protection scope of the present invention limited by appended claims, where appointing on the basis of the claims in the present invention
What modification, equivalent and improvement etc., each fall within protection scope of the present invention it.
Claims (3)
1. a kind of heat treatment method of chrome molybdenum wear resistant cast iron, it is characterised in that：The percentage by weight of its composition is：C2.8～
3.8%th, Si1.65～2.7%, Mn0.5～1.2%, P0.12～0.7%, Cr0.2～0.5%, Mo0.3～0.8%, S≤0.09%, remaining
Measure as Fe.
2. a kind of method of the chrome molybdenum wear resistant cast iron prepared described in claim 1, it is characterised in that：Including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon press C2.8～3.8%, Si1.65～2.7%, Mn0.5～
1.2%th, P0.12～0.7%, Cr0.2～0.5%, Mo0.3～0.8%, S≤0.09%, the mode of balance of Fe percentage by weights enter
Row 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, put into its quantity for furnace charge 18～
29%, composition carries out pre-deoxidation for the deoxidier of lime 70%+ fluorites 30%, then puts into ferromanganese that baking processes and ferrosilicon obtains iron
Liquid；
4th step：Both analysis：Take iron liquid casting sample quickly to be analyzed, chemical composition is adjusted according to analysis result；
5th step：Final deoxidizing：Bonded hard ferrite magnet is warming up to 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：Inoculation：Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, adds its quantity to be iron liquid amount
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 1440～1520 DEG C, is poured into a mould, obtained foundry goods；
8th step：High annealing.
3. the heat treatment method of a kind of chrome molybdenum wear resistant cast iron according to claim 1, it is characterised in that：The described the 8th
In step high annealing, load in heat-treatment furnace below 200 DEG C of foundry goods, 745～820 DEG C be warming up to the speed of 70～90 DEG C/h,
2～4h is when carrying out being quickly cooled to 520 DEG C for insulation, then foundry goods is put into heat-treatment furnace is cooled to 300 with the speed of 60～90 DEG C/h
Come out of the stove below DEG C air cooling, obtain chrome molybdenum wear resistant cast iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610953613.6A CN106521306A (en) | 2016-11-03 | 2016-11-03 | Heat treatment method for Cr-Mo wear-resistant cast iron |
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| CN201610953613.6A CN106521306A (en) | 2016-11-03 | 2016-11-03 | Heat treatment method for Cr-Mo wear-resistant cast iron |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521305A (en) * | 2016-11-03 | 2017-03-22 | 广西大学 | Wear-resistant chrome-molybdenum cast iron and preparation method thereof |
| CN108754341A (en) * | 2018-06-13 | 2018-11-06 | 中原内配集团安徽有限责任公司 | A kind of cylinder jacket based on chrome molybdenum copper alloy |
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| EP0427617A1 (en) * | 1989-11-09 | 1991-05-15 | Saint-Gobain Vitrage International | Use of specific cast iron compositions for press bending moulds for shaping of glass sheets |
| JP2010196147A (en) * | 2009-02-27 | 2010-09-09 | Toyota Motor Corp | Ferritic spheroidal graphite cast iron |
| CN102618780A (en) * | 2012-04-26 | 2012-08-01 | 枣庄市同捷汽车模具有限责任公司 | Molybdenum-chromium alloy abrasion-resistant cast iron |
| CN103131938A (en) * | 2013-03-13 | 2013-06-05 | 苏州东海玻璃模具有限公司 | Metal type rare earth microalloyed D-type graphite cast iron glass mould and preparation method thereof |
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2016
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|---|---|---|---|---|
| EP0427617A1 (en) * | 1989-11-09 | 1991-05-15 | Saint-Gobain Vitrage International | Use of specific cast iron compositions for press bending moulds for shaping of glass sheets |
| JP2010196147A (en) * | 2009-02-27 | 2010-09-09 | Toyota Motor Corp | Ferritic spheroidal graphite cast iron |
| CN102618780A (en) * | 2012-04-26 | 2012-08-01 | 枣庄市同捷汽车模具有限责任公司 | Molybdenum-chromium alloy abrasion-resistant cast iron |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521305A (en) * | 2016-11-03 | 2017-03-22 | 广西大学 | Wear-resistant chrome-molybdenum cast iron and preparation method thereof |
| CN108754341A (en) * | 2018-06-13 | 2018-11-06 | 中原内配集团安徽有限责任公司 | A kind of cylinder jacket based on chrome molybdenum copper alloy |
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Application publication date: 20170322 |