CN1218059C - Vermiculizer for disposing high sulfur melted iron in vermicular cast iron production - Google Patents
Vermiculizer for disposing high sulfur melted iron in vermicular cast iron production Download PDFInfo
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- CN1218059C CN1218059C CN 200310111438 CN200310111438A CN1218059C CN 1218059 C CN1218059 C CN 1218059C CN 200310111438 CN200310111438 CN 200310111438 CN 200310111438 A CN200310111438 A CN 200310111438A CN 1218059 C CN1218059 C CN 1218059C
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Abstract
The present invention discloses a vermicular agent used for processing high-sulfur iron melt to produce vermicular graphite cast iron. The vermicular agent comprises 15 to 35 wt% of rare earth (RE), 2 to 6 wt% of magnesium (Mg), 35 to 45 wt% of silicon (Si), 1 to 5 wt% of aluminum (Al), 1 to 5 wt% of calcium (Ca), 0.5 to 2.5 wt% of zinc (Zn), 0.5 to 2.5 wt% of barium (Ba) and Fe as the rest, and is prepared by smelting a rare earth Si-Fe alloy, metal Mg, SiCa, SiBa, Al ingots, Zn ingots, etc. as raw materials. The present invention has the characteristics of simple operation, good solubility, stable reaction, high absorption rate, high vermicular rate during iron melt processing, stable vermicular efficiency, strong anti-decay ability, wide market prospect and obvious economic benefit, and is capable of satisfying the producing needs of castings with different wall thicknesses.
Description
Technical field
The present invention relates to a kind of vermiculizer that is used to handle the molten iron production vermicular cast iron.Especially for the molten iron of handling high sulfur content.
Background technology
Graphite in the vermicular cast iron is vermiform, is a kind of graphite form between globular graphite and flake graphite, and graphite connects together in eutectic cell.Ferrite content is higher in the as-cast structure of common vermicular cast iron, can adopt methods such as alloying (Cr, Mo, Cu, Sn, Sb) etc. or normalizing treatment to improve pearlitic amount.The tensile strength of vermicular cast iron, unit elongation, impelling strength are between graphitic cast iron and magnesium iron, wear resistance is better than graphitic cast iron, thermal conductivity is better than magnesium iron and high-strength gray cast iron, thermal fatigue resistance is all better than magnesium iron and graphitic cast iron, can be used for making the component that ingot mold, vapor pipe, glass mold, retarding disc etc. are worked under alternating temperature-changing.The castability of vermicular cast iron is better than magnesium iron and high-strength gray cast iron, shrinkage cavity, shrinkage porosite are inclined to also less, compactness is good, thereby can be used for substituting high-strength gray cast iron, alloy gray cast-iron manufacturing pressure-resistant part, as cylinder body, cylinder cap, hydraulic valve, not only can reduce the seepage scrap rate in the withstand voltage test, and can improve product yield.That the vermicular cast iron cylinder body has is inexpensive, wear-resisting, antidetonation, cut down the consumption of energy and reduce the advantage of pollution, so the success of vermicular cast iron cylinder body, declares publicly the new engineering material that vermicular cast iron very likely becomes 21st century.
Up to the present, both at home and abroad all be utilize in the molten iron of certain ingredients by certain form adding an amount of alterant element---vermiculizer obtains vermicular cast iron, the vermiculizer of Ying Yonging mainly contains two big classes in the world: the first kind be country such as Great Britain and America use based on Mg, the Ce that adds interference element Ti etc. and be equipped with trace makes vermiculizer.This class vermiculizer all has preferably dissolution characteristics, chilling tendency little, and the anti-spheroidization of Ti has enlarged the residual Mg content range that obtains quasiflake graphite, can adapt to the fluctuation of Mg and S in the molten iron, but the vermiculation effect instability of such vermiculizer.On the other hand, Ti is the nodularization interference element, when the iron foundry (shop) produces spheroidal graphite cast iron and vermicular cast iron simultaneously, just needs the separated deposit foundry returns, makes troubles for production and management.Another kind of vermiculizer is the rare earth alloy that the rare-earth mixed metal that adopts of country such as Germany and the former Soviet Union and China adopt.The thermodynamics of reactions condition of rare earth alloy and molten iron is good, but dynamic conditions is relatively poor, and dissolving, the diffusion of rare earth alloy in molten iron is slow, causes the specific absorption of RE to reduce.For this reason, some factory takes to force hand mixing, and also some factory adds solubility promoter when wriggling processing, and as sodium aluminum fluoride, fluorite and salt etc., these all can contaminate environment, worsens labor condition.
Add the fusing point that magnesium can reduce vermiculizer in rare earth alloy, the diffusion and the absorption of vermiculizer are quickened in the gasification of magnesium in molten iron.The patent No. is ZL 99126853.9, and name is called " the new and effective vermiculizer of vermicular cast iron production usefulness ", and its alloy component range is: Mg6～15%, and RE3～5%, Si40～45%, MgO2.5～15%, Ca, Ba etc. are an amount of.This vermiculizer is applicable to low-sulfur molten iron, uses in the production of CA6110 engine cylinder-body, cylinder cap and succeeds.But when this vermiculizer is not handled high-sulphur molten iron and sulfur content of hot metal fluctuation, the nodulizing rate of molten iron and the technical information of vermiculation effect.
The difficult point of vermicular cast iron production is in the wriggling processing of molten iron, usually require the sulphur content of base iron low, and the fluctuation range of sulphur content is little, the amount of the vermiculizer element of wriggling processing must keep good corresponding relation with the sulfur content of molten iron, otherwise, can cause wriggling failure.When particularly the sulfur content fluctuation was big in high-sulphur molten iron and the molten iron, the fluctuation of production was bigger, makes Foundry Production be difficult to carry out, and has greatly limited the production and the use of vermicular cast iron.
Summary of the invention
The objective of the invention is to the deficiency that above-mentioned vermiculizer exists under the condition at high-sulphur molten iron, a kind of vermiculizer that high-sulphur molten iron is produced vermicular cast iron that is used to handle is provided, adopt this vermiculizer to handle the metallization processes of wriggling by the common method that pours, just can be under the sulfur content of hot metal conditions of higher, the vermicular cast iron foundry goods of stably manufactured different wall.
For achieving the above object, the technical solution used in the present invention is: a kind of vermiculizer that is used to handle high-sulphur molten iron production vermicular cast iron, it consists of: weight ratio is 15～35% rare earth RE, 2～6% magnesium Mg, 35～45% silicon Si, 1～5% aluminium Al, 1～5% calcium Ca, 0.5～2.5% zinc Zn, 0.5～2.5% barium Ba, surplus is Fe.
The raw-material proportioning of above-mentioned vermiculizer is: silicocalcium (SiCa): 4.5～20%, Si-Ba alloy (SiBa): 2.5～12.5%, rare earth ferrosilicon alloy (RESiFe): 55～80%, magnesium ingot (Mg): 2～6%, aluminium ingot (Al): 1～5%, zinc ingot metal (Zn): 0.5～2.5%, surplus is ferrosilicon (SiFe) alloy.
Manufacture craft of the present invention is simple, with 4.5～20% silicocalcium (SiCa), 2.5～12.5% Si-Ba alloy (SiBa) and 35～45% rare earth ferrosilicon alloys (RESiFe) are put at the bottom of the crucible, add 2～6% magnesium ingots again, 1～5% aluminium ingot, 0.5～2.5% zinc ingot metal, then 20～35% rare earth ferrosilicon alloys (RESiFe) of remainder and an amount of ferro-silicon (SiFe) are placed on magnesium, aluminium, above the zinc ingot metal, tamping, melting, when furnace temperature reaches about 1250～1300 ℃, when furnace charge becomes liquid state fully, pour into after stirring in the metal ingot mould, being broken into certain particle after cooling can use.
The effect of each component of the present invention is respectively:
(1) rare earth (RE)
Rare earth element has the ability of intensive deoxidation, desulfurization, and deoxidation, the formed oxide compound of desulfurization, sulfide can become effective substrate of graphite crystallization, and the free rare earth element can suppress graphite along a to growth, make wriggling of graphite.The present invention has adopted rare earth 15～35%, can guarantee that high-sulphur molten iron also can obtain high nodulizing rate and stable vermiculizer effect, also can adapt to the bigger working condition of sulphur content fluctuation in the molten iron simultaneously.
(2) magnesium (Mg)
Magnesium is a kind of nodularization element, has the ability of very strong change graphite form.An amount of magnesium helps reducing the fusing point of vermiculizer, and the diffusion and the absorption of vermiculizer are quickened in the gasification of magnesium in molten iron, and can play enough stirring actions to molten iron.
(3) silicon (Si)
Silicon has the intensive graphitizability, adds silicon in molten iron, can reduce the chilling tendency of molten iron, improves graphite form, and silicon can reduce the fusing point of vermiculizer, improves the dissolution characteristics of vermiculizer.On the other hand, silicon has played the effect of " flux " when vermiculizer is founded, alloying element is evenly distributed in the vermiculizer.
(4) aluminium (Al)
Aluminium make molten steel deoxidization, purification,, improve nucleation rate, promote greying, reduce the chilling tendency of molten iron.Owing to the deoxidation of aluminium and the fusing point of reduction vermiculizer, improved the specific absorption of rare earth, the scope that can widen wriggling constituent content in the molten iron when aluminium content is higher adapts to the fluctuation of molten steel sulfur content, helps the stable of wriggling.
(5) calcium (Ca)
Calcium plays the greying effect to molten iron in vermiculizer, calcium is stronger slightly than the graphitizability of aluminium, and it is the strongest that calcium aluminium is present in the vermiculizer graphite ability simultaneously, and calcium can reduce the vapour pressure of magnesium, make alloy reaction steady, thereby improved the specific absorption of rare earth in the vermiculizer, magnesium.
(6) barium (Ba)
Barium has greying and weak graphite metamorphism, and the steam of barium in high temperature liquid iron forces down, and can reduce the vapour pressure of magnesium, calcium, improves the specific absorption of magnesium, calcium.
(7) zinc (Zn)
The steam that zinc produces in molten iron has stirring action to molten iron, has improved the specific absorption of vermiculizer element.Zinc can be widened the scope of wriggling constituent content in the molten iron, helps stablizing the vermiculation effect of molten iron.
Wriggling treatment process of the present invention is ladle bottom pouring process commonly used, and is equipped with and once breeds and late inoculation.
The invention has the advantages that:
1. the present invention is applicable to that handling high-sulphur molten iron produces vermicular cast iron, have simple to operate, solvability good, reacting balance, specific absorption height and handle the nodulizing rate height of molten iron, the characteristics that vermiculation effect is stable, the anti-ageing ability of moving back is strong, can satisfy the needs of different wall castings production.
2. the present invention does not contain tension-active element Ti, gives the foundry returns management of the molding floor that produces spheroidal graphite cast iron and vermicular cast iron simultaneously, brings great convenience.
Embodiment:
Embodiment 1:
The chemical ingredients of vermiculizer: magnesium (Mg): 3%, rare earth (RE): 20%, silicon (Si): 42.5%, calcium (Ca): 2.5%, zinc (Zn): 1.5%, barium (Ba): 1.0%, aluminium (Al): 1.0%, Yu Weitie (Fe).
Preparation method: at the bottom of 11% silicocalcium (SiCa), 5% Si-Ba alloy (SiBa) and 42% rare earth ferrosilicon alloy (RESiFe) put into crucible, add 3% magnesium ingot, 1.0% aluminium ingot, 1.5% zinc ingot metal again, then the ferro-silicon (SiFe) of 30% rare earth ferrosilicon alloy (RESiFe) of remainder and 6.5% is placed on magnesium, aluminium, zinc ingot metal above, tamping, melting, when furnace temperature reaches about 1250～1300 ℃, when furnace charge becomes liquid state fully, pour into after stirring in the metal ingot mould, being broken into certain particle after cooling can use.
Embodiment 2:
The chemical ingredients of vermiculizer: magnesium (Mg): 4%, rare earth (RE): 18%, silicon (Si): 43.5%, calcium (Ca): 2.0%, zinc (Zn): 1.0%, barium (Ba): 1.5%, aluminium (Al): 1.5%, Yu Weitie (Fe).
Preparation method: at the bottom of 8.5% silicocalcium (SiCa), 7.5% Si-Ba alloy (SiBa) and 35% rare earth ferrosilicon alloy (RESiFe) put into crucible, add 4% magnesium ingot, 1.5% aluminium ingot, 1.0% zinc ingot metal again, then the ferro-silicon (SiFe) of 30% rare earth ferrosilicon alloy (RESiFe) of remainder and 12.5% is placed on magnesium, aluminium, zinc ingot metal above, tamping, melting, when furnace temperature reaches about 1250～1300 ℃, when furnace charge becomes liquid state fully, pour into after stirring in the metal ingot mould, being broken into certain particle after cooling can use.
Effect of the present invention gives an example 1:
RDS (Reciprocating Duplicate Systeem) natural gas compressor group is the serial compressor unit of U.S. Dresser-Rand company exploitation, and China introduces this unit from middle 1980s, and implements production domesticization.Cylinder body is a pressure part crucial in this unit, and its material is an alloy gray cast-iron.In the production domesticization process, there is the intensity instability in cylinder body, the leakage problems during water test.
By analysis and research, adopt vermicular cast iron to produce RDS natural gas compressor cylinder body, can improve the compactness of cylinder body material capability, increase cylinder body, improve the boost performance of compressor.Molten iron melting in the cupola furnace of 5t/h, tapping temperature are 1450 ℃.Alloying element adding method is, ferrochrome CrFe, molybdenum-iron MoFe, magnesium iron MnFe add simultaneously with batch of material after being stove, and copper Cu adds in casting ladle.The present invention is placed a side in the casting ladle of dykes and dams, molten iron directly pours, and is equipped with late inoculation.Detected result is as follows:
(1) chemical ingredients of base iron is: C3.5～3.7%, Si2.2～2.6%, Mn0.3～0.5%, S0.04～0.07%, Cr＜0.3%, Cu0.6～0.8%, Mo0.2～0.3%.
(2) vermiculizer and wriggling processing: the present invention with 1.0～1.2% handles the cupola furnace molten iron, and the nodulizing rate of stokehold φ 25mm coupon is controlled at about 75%, but the iron cylinder block casting of wriggling of stably manufactured body nodulizing rate 〉=85%.
(3) inoculation: carry out the stokehold with 0.5～0.6%75FeSi and once breed, carry out late inoculation with 0.1～0.15%CaSi during cast, can eliminate the cementite in the matrix fully.
(4) adopt optimization technology can obtain nodulizing rate 〉=85%, tensile strength sigma
b＞420MPa, content of pearlite in alloy 55～75%, the vermicular cast iron cylinder block casting of dense structure, and also the homogeneity of the tissue of cylinder body and performance increases substantially.
Effect of the present invention gives an example 2:
The high-low pressure cylinder body design material of 2V, 3W air compressor machine is a high-strength gray cast iron, but is prone to problems such as blade misrun, pressure testing seepage aborning, and scrap rate is very high.
Use the high-low pressure cylinder body of producing 2V, 3W air compressor machine through the vermicular cast iron of wriggling of the present invention processing instead, the nodulizing rate of cylinder body 〉=85%, tensile strength sigma
b＞420MPa satisfies the requirement of cylinder body to material capability fully, and has solved the defective of blade misrun and pressure testing seepage, improves the over-all properties of air compressor machine.
Claims (1)
1. one kind is used to handle the vermiculizer that high-sulphur molten iron is produced vermicular cast iron, it is characterized in that: it consists of: weight ratio is 15～35% rare earth RE, 2～6% magnesium Mg, 35～45% silicon Si, 1～5% aluminium Al, 1～5% calcium Ca, 0.5～2.5% zinc Zn, 0.5～2.5% barium Ba, surplus is Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310111438 CN1218059C (en) | 2003-11-24 | 2003-11-24 | Vermiculizer for disposing high sulfur melted iron in vermicular cast iron production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310111438 CN1218059C (en) | 2003-11-24 | 2003-11-24 | Vermiculizer for disposing high sulfur melted iron in vermicular cast iron production |
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| CN1544679A CN1544679A (en) | 2004-11-10 |
| CN1218059C true CN1218059C (en) | 2005-09-07 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100465317C (en) * | 2007-06-29 | 2009-03-04 | 河北科技大学 | Special-purpose multi-component low rare earth vermiculizer for producing thick wall Vermicular iron element by furnace cupola |
| CN101812626B (en) * | 2009-09-14 | 2012-09-05 | 中国一拖集团有限公司 | Vermiculizer for thin-wall cast iron and melting method thereof |
| CN102808060B (en) * | 2012-08-29 | 2014-03-12 | 福建省建阳市杜氏铸造有限公司 | Vermicular agent and preparation method thereof |
| CN102851575B (en) * | 2012-09-24 | 2014-04-23 | 苏州东海玻璃模具有限公司 | Oxidation-resistant alloying grey cast iron and preparation method thereof |
| CN103775342A (en) * | 2014-01-06 | 2014-05-07 | 广东美芝制冷设备有限公司 | Rotary compressor |
| CN103820740B (en) * | 2014-02-28 | 2017-07-07 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of ferrite heat-resistant cast steel and its preparation method and application |
| CN106191366A (en) * | 2016-09-13 | 2016-12-07 | 哈尔滨理工大学 | A kind of vermiculizer preparing vermicular cast iron and preparation method thereof |
| CN111676383A (en) * | 2020-06-09 | 2020-09-18 | 江苏亚峰合金材料有限公司 | Vermiculizer for heat-resistant cast iron and preparation method thereof |
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Granted publication date: 20050907 |