CN104451370B - Vanadium-containing hypereutectic high-chromium cast iron and preparation method thereof - Google Patents
Vanadium-containing hypereutectic high-chromium cast iron and preparation method thereof Download PDFInfo
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- CN104451370B CN104451370B CN201410838993.XA CN201410838993A CN104451370B CN 104451370 B CN104451370 B CN 104451370B CN 201410838993 A CN201410838993 A CN 201410838993A CN 104451370 B CN104451370 B CN 104451370B
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Abstract
The invention discloses a vanadium-containing hypereutectic high-chromium cast iron, and belongs to the technical field of high-chromium cast iron; the vanadium-containing hypereutectic high-chromium cast iron is prepared by deoxidation and breeding with ladle bottom pouring process, wherein the chemical constituents by weight percent are as follows: 3.5% to 4.4% of carbon C; 0.1% to 1.2% of manganese Mn; 15.5% to 21.5% of chromium Cr; 0.5% to 1.5% of silicon Si; 5.5% to 7.5% of vanadium V; less than or equal to 0.06% of phosphor P; less than or equal to 0.06% of sulfur; the rest is iron. The cast iron is able to be used for manufacturing members of slurry pump transflux part, and the like, which endure large abrasion; the manufacturing method thereof is simple and economical; the quality of product is stable; and the market foreground is abroad.
Description
Technical field
The present invention relates to rich chromium cast iron technical field.
Background technology
Rich chromium cast iron is a class application important high-abrasive material widely, and it is widely used in metallurgy, mine, water
All kinds of wearing terrains in the fields such as profit, electric power, the chemical industry and various conveying flow passage part containing solid particle fluid pump（Impeller, shield
Set and backplate）In.There is substantial amounts of high rigidity M in the tissue of rich chromium cast iron7C3Type carbide, thus there is excellent wearability,
Simultaneously because eutectic carbide pattern is in shaft-like distribution, therefore more other white cast-iron also make moderate progress in toughness.High chromium casting
Chromium in ferrum can not only effectively improve material corrosion resistance in the slurry, simultaneously a large amount of M containing chromium existing7C3Type carbide
Effectively improve the wear resistance of material, improve the service life of flow passage part.The increase of carbide quantity in rich chromium cast iron
Raising to flow passage part erosive wear drag has important impact, but, when carbide quantity improves to a certain extent, in height
Thick primary carbide will occur in chrome cast iron, and lead to the toughness of rich chromium cast iron drastically to decline, so that hypereutectic high-chromium
Cast iron loses use value.Therefore, the rich chromium cast iron currently used for this class flow passage part is usually carbon equivalent and is less than eutectic point
For the Hypoeutectic High Cr Cast Iron of the upper limit, the such as cast iron such as KMTBCr26 and KMTBCr15Mo3 in China's high-abrasive material national standard.
Due to there is brittle, thick carbide thus intensity and toughness are relatively low in hypereutectic high chromium cast iron, it is also easy to produce and splits
The casting flaws such as stricture of vagina, the application on wear parts for the hypereutectic high chromium cast iron of these drawbacks limit.Hypereutectic material should be kept
The high rigidity feature of material, improves its intensity and toughness, best bet is exactly to refine its primary carbide again.So, refinement
Carbide, change its distributional pattern, be the important means improving hypereutectic high chromium cast iron toughness.
The Chinese patent of Application No. 200710178680.6 discloses a kind of as cast condition high carbon and high chromium cast iron and its preparation side
The chemical composition of method, wherein high carbon and high chromium cast iron is（Weight %）：C 4.5～5.5, Cr 22.5～30.8, V 3.0～
5.0, Mn 0.7～1.2, Nb 0.2～0.5, Ti 0.5～1.0, Mg 0.08～0.20, Na 0.05～0.20, Re 0.05～
0.20, Si ＜ 1.0, balance of ferrum and inevitable trace impurity, and chromium carbon ratio >=5.0 and≤5.6.This patent main
Feature is raising carbon content in rich chromium cast iron, increases primary carbide, thus improving its wearability.But, due to this patent
In containing 0.5～1.0 Ti, and Ti element be very easy to oxidation, cause foundry goods to be also easy to produce the defects such as slag inclusion.In addition, this patent
Need to breed and use magnesium-rare earth and sodium salt to be combined and become using vanadium iron granule when alloy molten solution is come out of the stove in the preparation method providing
Matter is processed, and which increases manufacture difficulty, and the performance of material is wayward.
Patent WO2004/103608 describes a kind of method that evaporative pattern produces hypereutectic cast iron, can be used for producing slag
The part of the equipment such as stock pump, cyclone and disintegrating machine.The shortcoming of the method is：Mould investment is big, is unsuitable for the small quantities of slag of single-piece
The production of stock pump part；The maximum of its inovulant that can add is restricted（It is usually no more than 1%, maximum is less than 2%）；
The granularity of inovulant is less, is usually no more than 100um, the impurities phase such as the oxide on its surface to more, and in this invention condition
Under, these impurity all remain in foundry goods, have detrimental effect to the toughness of material.
Patent WO4047760-A1 and EP147422-A1 disclose a kind of wear-resisting hypereutectic high chromium cast iron, Cr in this cast iron
Too high levels are although hardness is higher, but toughness is low, need to be using relatively low pouring temperature（Pouring temperature is less than its liquidus curve
100 degree）, about 75 μm of the primary carbide size of acquisition.Because need adopt relatively low pouring temperature, therefore in cast thin-walled or multiple
, easily the defects such as cold shut, misrun and crackle in difficult forming during sundries during Foundry Production.
The Chinese patent of Application No. 201210182532.2 discloses a kind of high-carbon high vanadium abrasion-resistant stee, its composition quality hundred
Point ratio is：Carbon（C）2.0%～2.6%, vanadium（V）8.0%～9.0%, chromium（Cr）5.5%～6.5%, molybdenum（Mo）2.0%～3.0%, nickel
（Ni）0.5%～1.0%, niobium（Nb）1.0%～2.0%, silicon（Si）0.4%～1.0%, phosphorus（P）＜ 0.04%, sulfur（S）＜ 0.04%, remaining
Measure as ferrum（Fe）.This steel is due to adding the noble elements such as Mo, Ni and Nb, thus relatively costly.
United States Patent (USP) " the Microstructurally refined multiphase of Publication No. 5803152
Castings " describes a kind of method of refinement primary phase, and the method is applied to the alloy of all eutectic phases（Aluminum/silicon, copper/silver,
Particular for white cast-iron）.This technique is to add inovulant while pouring cast part in molten metal.Its shortcoming is：Breed
The addition of agent is higher, and the impurity such as the oxide on its surface typically all remains in foundry goods, has unfavorable shadow to the toughness of material
Ring；Additionally, the method pouring temperature is low, the mobility of aluminium alloy is bad, is less suitable for producing Wet Parts of slurry pump etc
Complex Parts.
R.J.Llewellyn et al. delivered one entitled《Scouring erosion resistance of
metallic materials used in slurry pump service》Paper.This paper a kind of with conventional
The hypereutectic high chromium cast iron that casting technique produces, this cast iron has preferably corrosion-resistant flushing resistance, but this paper does not have
The method introducing refinement primary carbide.
In sum, although prior art all has research to containing vanadium cast iron, hypereutectic cast iron and rich chromium cast iron, there is also
High cost, complex process, the many disadvantages such as the suitability is narrow, effect is undesirable, especially also lack one kind and are applied to manufacture excessively stream
The high abrasion of part and wearing terrain, high tenacity, high-hardness.
Content of the invention
The technical problem to be solved in the present invention is for above-mentioned the deficiencies in the prior art, provides a kind of hypereutectic high-chromium containing vanadium
Cast iron and its manufacture method, this hypereutectic high chromium cast iron has the characteristics that high abrasion, high tenacity, high rigidity, can be used in manufacturing
Wet Parts of slurry pump etc. is easily subject to high-wearing part, its manufacture method simple economy, and product quality is stable.
For solving above-mentioned technical problem, the technical solution used in the present invention is：A kind of hypereutectic high chromium cast iron containing vanadium, should
Cast iron breeds prepared by deoxidation treatment and through ladle bottom pouring process, and its chemical composition as expressed in weight percent is：
Carbon C 3.5～4.4%, manganese Mn 0.1～1.2%,
Chromium Cr 15.5～21.5%, silicon Si 0.5～1.5%,
Vanadium V 5.5～7.5%, phosphorus P 0.06%,
Sulfur S 0.06%, remaining is ferrum.
Preferably, above-mentioned hypereutectic high chromium cast iron containing vanadium chemical composition as expressed in weight percent is：
Carbon C 3.99%, manganese Mn 0.81%,
Chromium Cr 20.51%, silicon Si 0.86%,
Vanadium V 6.1%, phosphorus P 0.028%,
Sulfur S 0.024%, remaining is ferrum.
The above-mentioned manufacture method containing vanadium hypereutectic high chromium cast iron, it has following steps：
（1）With steel scrap, conversion pig, high carbon ferro-chrome and high carbon ferromanganese as raw material, will be former at a temperature of 1500～1600 DEG C
Material melting is iron liquid；
（2）Add the aluminium powder for deoxidation in iron liquid, addition is the 0.08～0.12% of iron liquid weight；
（3）The vanadium iron being preheated to 470～580 DEG C is added in iron liquid, makes vanadium iron whole at a temperature of 1400～1450 DEG C
Melt and be dispersed in iron liquid, then bonded hard ferrite magnet is promoted to 1500～1600 DEG C and comes out of the stove；
（4）Inoculation is carried out to iron liquid using ladle bottom pouring process, inovulant is the granularity accounting for iron liquid weight 0.2～0.5%
Ferrotitanium particle less than 10mm；Breed after finishing simultaneously calm slagging-off, pour into iron liquid in sand mold at a temperature of 1360～1400 DEG C
Casting mold；The cast iron chemical composition as expressed in weight percent finally giving is：
Carbon C 3.5～4.4%, manganese Mn 0.1～1.2%,
Chromium Cr 15.5～21.5%, silicon Si 0.5～1.5%,
Vanadium V 5.5～7.5%, phosphorus P 0.06%,
Sulfur S 0.06%, remaining is ferrum.
Preferably, above-mentioned steps（1）To step（3）In firing equipment be intermediate frequency furnace.
Have the beneficial effects that using produced by technique scheme：This method creatively with the addition of in rich chromium cast iron
Vanadium, thus having obtained a kind of hypereutectic high chromium cast iron containing vanadium, this cast iron has the characteristics that high abrasion, high tenacity, high rigidity, casting
Heat treatment step can be omitted after type, can be used in manufacturing Wet Parts of slurry pump etc. easily by high-wearing part, its system
Make method simple economy, product quality is stable, there is wide market prospect.
Brief description
Fig. 1 is the metallograph of cast iron of the present invention in embodiment 3；
Fig. 2 is the metallograph of comparative alloy in embodiment 3.
Specific embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Embodiment 1：
A kind of manufacture method containing vanadium hypereutectic high chromium cast iron, it has following steps：
（1）By 205kg high carbon ferro-chrome（FeC55C600II）, 110kg conversion pig（L04）, 127kg steel scrap is added to
In 500kg intermediate frequency furnace, heating melts them for iron liquid；
（2）Iron liquid is warming up to 1500～1600 DEG C, adds 0.5kg aluminium powder in iron liquid；
（3）By the vanadium iron for 58kg for the weight（FeV50-B）Add after being preheated to 470～580 DEG C in iron liquid, 1400～
So that vanadium iron is all melted at a temperature of 1450 DEG C and be dispersed in iron liquid, then bonded hard ferrite magnet is promoted to 1500～1600 DEG C
And come out of the stove；
（4）The granularity putting into 2.0kg at bag bottom is less than the Ferrotitanium particle of 10mm, using pouring method, iron liquid is bred
Process；Breed finish and calm slagging-off after, at a temperature of 1360 DEG C, iron liquid is poured in Castings Produce with Furan Resin, produce backplate and
The Wet Parts of slurry pumps such as sheath simultaneously pour into a mould impact toughness sample with type, and specimen size is 20 mm × 20mm × 110mm.
The cast iron chemical composition and mechanical property as expressed in weight percent that said method produces see table 1：
Table 1.
Embodiment 2：
A kind of manufacture method containing vanadium hypereutectic high chromium cast iron, it has following steps：
（1）By 155kg high carbon ferro-chrome（FeC55C1000II）, 90kg conversion pig（L04）, 179kg steel scrap and 3kg high-carbon
Ferromanganese（FeMn78C8.0）It is added in 500kg intermediate frequency furnace, heating melts them for iron liquid；
（2）Iron liquid is warming up to 1500～1600 DEG C, adds 0.5kg aluminium powder in iron liquid；
（3）By the vanadium iron for 73kg for the weight（FeV50-B）Add after being preheated to 470～580 DEG C in iron liquid, 1400～
So that vanadium iron is all melted at a temperature of 1450 DEG C and be dispersed in iron liquid, then bonded hard ferrite magnet is promoted to 1500～1600 DEG C
And come out of the stove；
（4）The granularity putting into 2.0kg at bag bottom is less than the Ferrotitanium particle of 10mm, using pouring method, iron liquid is bred
Process；Breed finish and calm slagging-off after, at a temperature of 1400 DEG C, iron liquid is poured in Castings Produce with Furan Resin, produce backplate and
The Wet Parts of slurry pumps such as sheath simultaneously pour into a mould impact toughness sample with type, and specimen size is 20 mm × 20mm × 110mm.
The cast iron chemical composition and mechanical property as expressed in weight percent that said method produces see table 2：
Table 2.
Embodiment 3：
A kind of manufacture method containing vanadium hypereutectic high chromium cast iron, it has following steps：
（1）By 200kg high carbon ferro-chrome（FeC55C600II）, 188kg conversion pig（L04）, 50kg steel scrap and 2kg high-carbon
Ferromanganese（FeMn78C8.0）It is added in 500kg intermediate frequency furnace, heating melts them for iron liquid；
（2）Iron liquid is warming up to 1500～1600 DEG C, adds 0.5kg aluminium powder in iron liquid；
（3）By the vanadium iron for 60kg for the weight（FeV50-B）Add after being preheated to 470～580 DEG C in iron liquid, 1400～
So that vanadium iron is all melted at a temperature of 1450 DEG C and be dispersed in iron liquid, then bonded hard ferrite magnet is promoted to 1500～1600 DEG C
And come out of the stove；
（4）The granularity putting into 2.0kg at bag bottom is less than the Ferrotitanium particle of 10mm, using pouring method, iron liquid is bred
Process；Breed finish and calm slagging-off after, at a temperature of 1390 DEG C, iron liquid is poured in Castings Produce with Furan Resin, produce backplate and
The Wet Parts of slurry pumps such as sheath, and pour into a mould impact toughness sample with type, specimen size is 20 mm × 20mm × 110mm.
, the comparative alloy without vanadium and this sample are compared, wherein comparative alloy taking the sample in embodiment 3 as a example
It is also adopted by pouring temperature same as Example 3 and identical specimen size, result see table 3：
Table 3.
The metallograph that in embodiment 3, this contains vanadium cast iron is shown in Fig. 1, and the metallograph of comparative alloy sample is shown in Fig. 2.
Visible by comparing, primary carbide that in embodiment 3, this contains vanadium hypereutectic high chromium cast iron is substantially refined, and
There is higher hardness and impact flexibility, be therefore subject to high-wearing in use more suitable for manufacturing Wet Parts of slurry pump etc.
Part, embodiment 1 and the cast iron of embodiment 2 also have the characteristic similar with embodiment 3 sample.The simple warp of this cast iron manufacture method
Ji, product quality is stable, can omit heat treatment step, have broad application prospects after casting mold.
Claims (4)
1. a kind of hypereutectic high chromium cast iron containing vanadium it is characterised in that：Breed prepared by deoxidation treatment and through ladle bottom pouring process, its
Chemical composition as expressed in weight percent is：
Carbon C 3.5～3.99%, manganese Mn 0.1～1.2%,
Chromium Cr 15.5～21.5%, silicon Si 0.5～1.5%,
Vanadium V 5.5～7.5%, phosphorus P 0.06%,
Sulfur S 0.06%, remaining is ferrum;
Described hypereutectic high chromium cast iron containing vanadium prepares according to the method comprising the following steps：
（1）With steel scrap, conversion pig, high carbon ferro-chrome and high carbon ferromanganese as raw material, at a temperature of 1500～1600 DEG C, raw material is melted
Melt as iron liquid；
（2）Add the aluminium powder for deoxidation in iron liquid, addition is the 0.08～0.12% of iron liquid weight；
（3）The vanadium iron being preheated to 470～580 DEG C is added in iron liquid, so that vanadium iron is all melted at a temperature of 1400～1450 DEG C
And be dispersed in iron liquid, then bonded hard ferrite magnet is promoted to 1500～1600 DEG C and comes out of the stove；
（4）Inoculation is carried out to iron liquid using ladle bottom pouring process, inovulant is that the granularity accounting for iron liquid weight 0.2～0.5% is less than
The Ferrotitanium particle of 10mm；Breed after finishing simultaneously calm slagging-off, at a temperature of 1360～1400 DEG C, iron liquid is poured into casting mold in sand mold.
2. hypereutectic high chromium cast iron containing vanadium according to claim 1 it is characterised in that：Its as expressed in weight percentization
Study and be divided into：
Carbon C 3.99%, manganese Mn 0.81%,
Chromium Cr 20.51%, silicon Si 0.86%,
Vanadium V 6.1%, phosphorus P 0.028%,
Sulfur S 0.024%, remaining is ferrum.
3. described in claim 1 contain vanadium hypereutectic high chromium cast iron manufacture method it is characterised in that：There are following steps：
（1）With steel scrap, conversion pig, high carbon ferro-chrome and high carbon ferromanganese as raw material, at a temperature of 1500～1600 DEG C, raw material is melted
Melt as iron liquid；
（2）Add the aluminium powder for deoxidation in iron liquid, addition is the 0.08～0.12% of iron liquid weight；
（3）The vanadium iron being preheated to 470～580 DEG C is added in iron liquid, so that vanadium iron is all melted at a temperature of 1400～1450 DEG C
And be dispersed in iron liquid, then bonded hard ferrite magnet is promoted to 1500～1600 DEG C and comes out of the stove；
（4）Inoculation is carried out to iron liquid using ladle bottom pouring process, inovulant is that the granularity accounting for iron liquid weight 0.2～0.5% is less than
The Ferrotitanium particle of 10mm；Breed after finishing simultaneously calm slagging-off, at a temperature of 1360～1400 DEG C, iron liquid is poured into casting mold in sand mold；
The cast iron chemical composition as expressed in weight percent finally giving is：
Carbon C 3.5～3.99%, manganese Mn 0.1～1.2%,
Chromium Cr 15.5～21.5%, silicon Si 0.5～1.5%,
Vanadium V 5.5～7.5%, phosphorus P 0.06%,
Sulfur S 0.06%, remaining is ferrum.
4. the manufacture method of hypereutectic high chromium cast iron containing vanadium according to claim 3 it is characterised in that：Described step（1）Extremely
Described step（3）In firing equipment be intermediate frequency furnace.
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| CN107574360A (en) * | 2017-09-06 | 2018-01-12 | 马鞍山市万兴耐磨金属制造有限公司 | A kind of rich chromium cast iron high-strength alloy wear-resistant ball and its manufacture method |
| CN110079725B (en) * | 2019-05-21 | 2020-07-14 | 石家庄工业泵厂有限公司 | Ultra-high wear-resistant hypereutectic high-chromium cast iron material, and preparation method and application thereof |
| CN115287527B (en) * | 2022-08-19 | 2023-04-25 | 沈阳盛世五寰科技有限公司 | High-performance hypereutectic high-chromium cast iron without rare earth modifier and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6227553A (en) * | 1985-07-30 | 1987-02-05 | Hitachi Ltd | High-carbon-high-chromium steel and its production |
| CN101892417A (en) * | 2010-06-30 | 2010-11-24 | 石家庄铁道大学 | As-cast hypereutectic high chromium cast iron and preparation method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA844074B (en) * | 1983-05-30 | 1986-04-30 | Vickers Australia Ltd | Abrasion resistant materials |
| CN1014906B (en) * | 1989-04-17 | 1991-11-27 | 唐山市冶金耐磨材料厂 | Hi-chrome cast iron for grinding balls |
| CN101851725B (en) * | 2010-04-30 | 2012-09-05 | 燕山大学 | Alloy for improving shapes of carbides in nickel-hardened indefinite chilled cast iron and manufacturing method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6227553A (en) * | 1985-07-30 | 1987-02-05 | Hitachi Ltd | High-carbon-high-chromium steel and its production |
| CN101892417A (en) * | 2010-06-30 | 2010-11-24 | 石家庄铁道大学 | As-cast hypereutectic high chromium cast iron and preparation method thereof |
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Effective date of registration: 20230809 Address after: 122300 Dawujiazi Village, Dachengzi Town, Harqin Zuoyi Mongol Autonomous County, Chaoyang City, Liaoning Province Patentee after: LIAONING GIAHAR INVESTMENT CASTINGS Co.,Ltd. Address before: 050043 No. 17, North Second Ring Road, Hebei, Shijiazhuang Patentee before: SHIJIAZHUANG TIEDAO University |