CN106521305A - Wear-resistant chrome-molybdenum cast iron and preparation method thereof - Google Patents
Wear-resistant chrome-molybdenum cast iron and preparation method thereof Download PDFInfo
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- CN106521305A CN106521305A CN201610953611.7A CN201610953611A CN106521305A CN 106521305 A CN106521305 A CN 106521305A CN 201610953611 A CN201610953611 A CN 201610953611A CN 106521305 A CN106521305 A CN 106521305A
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- cast iron
- wear
- iron
- chrome
- molybdenum 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
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- 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
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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
- C22C37/06—Cast-iron alloys containing chromium
Abstract
The invention discloses wear-resistant chrome-molybdenum cast iron and a preparation method of the wear-resistant chrome-molybdenum cast iron. The wear-resistant chrome-molybdenum cast iron comprises, by weight, 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, not larger than 0.09% of S and the balance Fe. The preparation method of the wear-resistant chrome-molybdenum cast iron comprises the steps of material mixing, preheating, smelting, rapid on-the-spot sample analysis, final deoxidation, inoculation and pouring. The preparation method of the wear-resistant chrome-molybdenum cast iron is simple in technology, and the structure can be significantly refined through straight control over the addition of chrome and molybdenum; and the mechanical strength, the wear resistance, the heat resistance and other comprehensive performance of the wear-resistant chrome-molybdenum cast iron can be improved, the mechanical performance of the wear-resistant chrome-molybdenum cast iron can reach the HT250 grade, and the wear-resistant chrome-molybdenum cast iron is particularly suitable for casting of an air cylinder, a piston ring and a tappet rod.
Description
Technical field
The present invention relates to the production technical field of ferrous metal, especially a kind of chrome molybdenum wear resistant cast iron and preparation method thereof.
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
While spending, still with preferable toughness and cutting additivity.
The content of the invention
The technical problem solved needed for of the invention is to provide a kind of chrome molybdenum wear resistant cast iron and preparation method thereof.By controlling casting
In iron, the addition of chromium and molybdenum, casts out wear resistant cast iron.
The technical solution adopted for the present invention to solve the technical problems is：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.
A kind of method for preparing chrome molybdenum wear resistant cast iron, 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.
The invention has the beneficial effects as follows：Casting technique is simple, by strict control chromium, the addition of molybdenum, significantly can change
Tissue, puies forward the combination property such as mechanical strength, wear-resisting, heat-resisting,
Its mechanical performance is particularly suitable for casting cylinder, piston ring and tappet up to the HT250 trades mark.
Specific embodiment
Embodiment 1：
A kind of method for preparing 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.
Embodiment 2：
A kind of method for preparing 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.
Embodiment 3：
A kind of method for preparing 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 1520 DEG C, is poured into a mould, obtained foundry goods.
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.
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| CN201610953611.7A CN106521305A (en) | 2016-11-03 | 2016-11-03 | Wear-resistant chrome-molybdenum cast iron and preparation method thereof |
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| CN201610953611.7A CN106521305A (en) | 2016-11-03 | 2016-11-03 | Wear-resistant chrome-molybdenum cast iron and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521306A (en) * | 2016-11-03 | 2017-03-22 | 广西大学 | Heat treatment method for Cr-Mo wear-resistant cast iron |
| CN106978528A (en) * | 2017-04-27 | 2017-07-25 | 卓健 | A kind of heat treatment method for filling sanction machine engine piston ring |
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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 |
| CN106521306A (en) * | 2016-11-03 | 2017-03-22 | 广西大学 | Heat treatment method for Cr-Mo wear-resistant cast iron |
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2016
- 2016-11-03 CN CN201610953611.7A patent/CN106521305A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106521306A (en) * | 2016-11-03 | 2017-03-22 | 广西大学 | Heat treatment method for Cr-Mo wear-resistant cast iron |
Non-Patent Citations (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521306A (en) * | 2016-11-03 | 2017-03-22 | 广西大学 | Heat treatment method for Cr-Mo wear-resistant cast iron |
| CN106978528A (en) * | 2017-04-27 | 2017-07-25 | 卓健 | A kind of heat treatment method for filling sanction machine engine piston ring |
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Application publication date: 20170322 |