CN106435126A - Heat treatment method of vanadium-titanium wear-resistant cast iron - Google Patents
Heat treatment method of vanadium-titanium wear-resistant cast iron Download PDFInfo
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- CN106435126A CN106435126A CN201610955294.2A CN201610955294A CN106435126A CN 106435126 A CN106435126 A CN 106435126A CN 201610955294 A CN201610955294 A CN 201610955294A CN 106435126 A CN106435126 A CN 106435126A
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- iron
- cast iron
- resistant cast
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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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
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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 of vanadium-titanium wear-resistant cast iron. The vanadium-titanium wear-resistant cast iron is composed of the following components in percentage by weight: 2.9-3.8% of C, 1.2-2.2% of Si, 0.5-1.3% of Mn, 0.16-0.37% of V, 0.03-0.17% of Ti, at most 0.2% of P, at most 0.10% of S and the balance of Fe. The method comprises the following steps: proportioning, preheating, smelting, on-the-spot sample analysis, end deoxidation, inoculation, casting and high-temperature annealing. The method is simple; the addition amounts of vanadium and titanium are strictly controlled, so the wear resistance is 1-2 times higher than that of common inoculated cast iron HT200 and HT250; less scrap steel can be used; the mechanical properties and machinability are improved; and the method is especially suitable for casting machine tool guide rails.
Description
Technical field
The present invention relates to the production technical field of ferrous metal, especially a kind of heat treatment method of vanadium titanium wear resistant cast iron.
Background technology
Vanadium titanium wear resistant cast iron is a kind of antifriction material of function admirable, the use that it has very high hardness and extends foundry goods
The feature in life-span.Vanadium in vanadium titanium wear resistant cast iron, titanium two element and carbon nitrogen have very big affinity.Form distinctive vanadium titanium carbon nitrogen
Compound, these compounds have very high microhardness, up to 960～1840HV, are distributed in matrix in tiny Hard Inclusion
Among tissue, the Wear vesistance of cast iron is made to greatly improve.There is abundant vanadium titanium symbiotic iron ore resource in Southwestern China area.Fully profit
With the resources characteristic of China, therefore, develop vanadium-titanium cast iron, to extend the service life of foundry goods.In addition to eliminating free carburizing
Body, reduces hardness, improves mechanical performance and machinability, need to carry out the high temperature anneal.
Content of the invention
The required technical problem solving of the present invention is to provide a kind of heat treatment method of vanadium titanium wear resistant cast iron.Cast by controlling
In iron, the addition of vanadium and titanium, casts out wear resistant cast iron, and carries out high annealing and improve 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 C2.9～3.8%, Si1.2～2.2%, Mn0.5～
1.3%th, V0.16～0.37%, Ti0.03～0.17%, P≤0.2%, S≤0.10%, the mode of balance of Fe percentage by weight is carried out
Dispensing；
Second step：Preheating：By optimization calculate steel scrap, foundry returns, the pig iron put into intermediate frequency furnace in preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, put into its quantity be furnace charge 15～
22%, composition is that the deoxidier of lime 70%+ fluorite 30% carries out pre-deoxidation, then puts into the 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 1460～1580 DEG C, puts into the aluminium that its quantity is iron liquid 0.1～0.3%
Carry out final deoxidizing；
6th step：Inoculation：Iron liquid flows to from intermediate frequency furnace and carries out inoculation during casting ladle, 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 1420～1470 DEG C, is poured into a mould, obtained foundry goods；
8th step：High annealing.
In the 8th described step high annealing, load below 200 DEG C of foundry goods in heat-treatment furnace, with the speed of 60～100 DEG C/h
Degree is warming up to 770～825 DEG C, and 1～5h is when carrying out being quickly cooled to 530 DEG C for insulation, then by foundry goods put into heat-treatment furnace with 50～
The speed of 80 DEG C/h is cooled to less than 300 DEG C air coolings of coming out of the stove, and obtains vanadium titanium wear resistant cast iron.
The invention has the beneficial effects as follows：Method is simple, and by the strict addition controlling vanadium and titanium, its wearability is than common
The inoculation cast iron HT200 trade mark, the HT250 trade mark are high 1～2 times, and can use steel scrap less, improve mechanical performance simultaneously and cutting adds
Work performance, is particularly suitable for casting machine tool guideway.
Specific embodiment
Embodiment 1：
A kind of heat treatment method of vanadium titanium 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 C2.9%, Si1.2%, Mn0.5%, V0.16%,
Ti0.03%, P≤0.2%, S≤0.10%, the mode of balance of Fe percentage by weight carries out dispensing；
Second step：Preheating：By optimization calculate steel scrap, foundry returns, the pig iron put into intermediate frequency furnace in preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, putting into its quantity is furnace charge 15%, becomes
The deoxidier being divided into lime 70%+ fluorite 30% carries out pre-deoxidation, then puts into the 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 1460 DEG C, puts into the aluminium that its quantity is iron liquid 0.1% and carry out final deoxidizing；
6th step：Inoculation：Iron liquid flows to from intermediate frequency furnace and carries out inoculation during casting ladle, 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 1420 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, be warming up to 770 DEG C with the speed of 60 DEG C/h, protect
When warm 1h carries out being quickly cooled to 530 DEG C, then foundry goods is put into heat-treatment furnace it is cooled to less than 300 DEG C with the speed of 50 DEG C/h and come out of the stove
Air cooling, obtains vanadium titanium wear resistant cast iron.
Embodiment 2：
A kind of heat treatment method of vanadium titanium 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 C3.35%, Si1.7%, Mn0.9%, V0.265%,
Ti0.1%, P≤0.2%, S≤0.10%, the mode of balance of Fe percentage by weight carries out dispensing；
Second step：Preheating：By optimization calculate steel scrap, foundry returns, the pig iron put into intermediate frequency furnace in preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, putting into its quantity is furnace charge 18%, becomes
The deoxidier being divided into lime 70%+ fluorite 30% carries out pre-deoxidation, then puts into the 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 1520 DEG C, puts into the aluminium that its quantity is iron liquid 0.2% and carry out final deoxidizing；
6th step：Inoculation：Iron liquid flows to from intermediate frequency furnace and carries out inoculation during casting ladle, 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 1445 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, be warming up to 797.5 DEG C with the speed of 80 DEG C/h,
3h is when carrying out being quickly cooled to 530 DEG C for insulation, then foundry goods is put into heat-treatment furnace is cooled to less than 300 DEG C with the speed of 65 DEG C/h
Stove air cooling, obtains vanadium titanium wear resistant cast iron.
Embodiment 3：
A kind of heat treatment method of vanadium titanium 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%, Si2.2%, Mn1.3%, V0.37%,
Ti0.17%, P≤0.2%, S≤0.10%, the mode of balance of Fe percentage by weight carries out dispensing；
Second step：Preheating：By optimization calculate steel scrap, foundry returns, the pig iron put into intermediate frequency furnace in preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, putting into its quantity is furnace charge 22%, becomes
The deoxidier being divided into lime 70%+ fluorite 30% carries out pre-deoxidation, then puts into the 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 1580 DEG C, puts into the aluminium that its quantity is iron liquid 0.3% and carry out final deoxidizing；
6th step：Inoculation：Iron liquid flows to from intermediate frequency furnace and carries out inoculation during casting ladle, 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 1470 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, be warming up to 825 DEG C with the speed of 100 DEG C/h,
5h is when carrying out being quickly cooled to 530 DEG C for insulation, then foundry goods is put into heat-treatment furnace is cooled to less than 300 DEG C with the speed of 80 DEG C/h
Stove air cooling, obtains vanadium titanium 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 limits 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 (2)
1. a kind of heat treatment method of vanadium titanium wear resistant cast iron it is characterised in that:Including following several steps：
The first step：Dispensing：By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon press C2.9～3.8%, Si1.2～2.2%, Mn0.5～
1.3%th, V0.16～0.37%, Ti0.03～0.17%, P≤0.2%, S≤0.10%, the mode of balance of Fe percentage by weight is carried out
Dispensing；
Second step：Preheating：By optimization calculate steel scrap, foundry returns, the pig iron put into intermediate frequency furnace in preheated；
3rd step：Melting：After the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, put into its quantity be furnace charge 15～
22%, composition is that the deoxidier of lime 70%+ fluorite 30% carries out pre-deoxidation, then puts into the 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 1460～1580 DEG C, puts into the aluminium that its quantity is iron liquid 0.1～0.3%
Carry out final deoxidizing；
6th step：Inoculation：Iron liquid flows to from intermediate frequency furnace and carries out inoculation during casting ladle, 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 1420～1470 DEG C, is poured into a mould, obtained foundry goods；
8th step：High annealing.
2. a kind of vanadium titanium wear resistant cast iron according to claim 1 heat treatment method 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, be warming up to 770～825 with the speed of 60～100 DEG C/h
DEG C, 1～5h is when carrying out being quickly cooled to 530 DEG C for insulation, then foundry goods is put into heat-treatment furnace is cooled to the speed of 50～80 DEG C/h
Less than 300 DEG C air coolings of coming out of the stove, obtain vanadium titanium wear resistant cast iron.
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| CN201610955294.2A CN106435126A (en) | 2016-11-03 | 2016-11-03 | Heat treatment method of vanadium-titanium wear-resistant cast iron |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182889A (en) * | 2018-07-30 | 2019-01-11 | 天津立林钻头有限公司 | Novel anti-attrition, wear resistant cast iron and preparation method thereof |
| CN113584374A (en) * | 2021-07-16 | 2021-11-02 | 四川大学 | High-strength and high-wear-resistance vanadium-titanium cast iron brake drum |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182889A (en) * | 2018-07-30 | 2019-01-11 | 天津立林钻头有限公司 | Novel anti-attrition, wear resistant cast iron and preparation method thereof |
| CN113584374A (en) * | 2021-07-16 | 2021-11-02 | 四川大学 | High-strength and high-wear-resistance vanadium-titanium cast iron brake drum |
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Application publication date: 20170222 |