CN101942598A - Cast iron production process capable of stabilizing high vermicular rate - Google Patents
Cast iron production process capable of stabilizing high vermicular rate Download PDFInfo
- Publication number
- CN101942598A CN101942598A CN2010105221750A CN201010522175A CN101942598A CN 101942598 A CN101942598 A CN 101942598A CN 2010105221750 A CN2010105221750 A CN 2010105221750A CN 201010522175 A CN201010522175 A CN 201010522175A CN 101942598 A CN101942598 A CN 101942598A
- Authority
- CN
- China
- Prior art keywords
- iron
- molten iron
- vermiculizer
- molten
- cast iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a cast iron production process capable of stabilizing high vermicular rate, comprising the following steps: taking an intermediate frequency furnace as a smelting container, smelting pig iron into a molten state, adding foundry returns and steel scrap to the molten iron, and heating the obtained mixture to 1430 DEG C; measuring content of elements in the molten iron with an optical spectrum analyzer, and adding a carburetant and an alloy to adjust content of the elements into a target scope according to a measuring result; accurately weighing a vermiculizer and an inoculant according to the sulfur and phosphorus contents in the molten iron, and preheating eddy molten iron packet to 800 DEG C; placing part of the vermiculizer and the inoculant at one side of the bottom part of the molten iron packet; heating the molten iron to 1470 DEG C, dumping the molten iron into the molten iron packet from the other side thereof, adding the residual vermiculizer and the residual inoculant to the molten iron with flow, and allowing the molten iron to be contacted with the vermiculizer and the inoculant at one side of the bottom part of the molten iron packet at the same time to form secondary inoculation; and pouring castings, and then eliminating stress of the castings. By adopting the cast iron production process, the vermicular iron the vermicular rate of which is stabilized at more than 85% can be obtained.
Description
Technical field
The invention belongs to machinery manufacturing technology field, be specifically related to a kind of Cast Iron Production technology of stablizing high nodulizing rate.
Background technology
Cast iron is the base mateiral that is most widely used in the current metallic substance, occupy an important position in cast material, and vermicular cast iron appears at the sixties in 20th century as a kind of novel cast iron materials, and China also is one of research vermicular cast iron country the earliest.Vermicular cast iron, as its name suggests, graphite shape in this cast iron should be vermiform, yet, because this graphite is the transitional form between flake graphite and the globular graphite, its feature of solidifying makes its graphite sheet, bulk, spherical with different ratio coexistences often, and the variable effect of ratio is to the various changes of properties of cast iron between the various graphite shapes.When being mainly vermiform and indivedual sheets in the graphite two dimension form, rolling into a ball when spherical, its performance is in the criticality between magnesium iron and the graphitic cast iron, and it is the extremely difficult stable tissue that obtains.When the content ratio of quasiflake graphite is enough to make foundry goods to satisfy service demand, in the time of keeping advantages of good casting again, this cast iron just can be referred to as vermicular cast iron; The performance of vermicular cast iron depends primarily on the ratio of quasiflake graphite---nodulizing rate.
The iron of wriggling be divided into substantially " high nodulizing rate ", " middle nodulizing rate " and " low nodulizing rate " three class (that is, and 80% 〉=, 80%～50%, 〉=50%), be convenient to people and select as required to use.
Vermicular cast iron is as a kind of novel engineering materials, its intensity, plasticity, toughness are higher than graphitic cast iron, vibration damping, the capacity of heat transmission and castability that similar graphitic cast iron is arranged, castability is better than spheroidal graphite cast iron, the mobile approximate gray iron of the iron of wriggling casting, tensile strength is compared gray iron and is improved at least 70, and Young's modulus improves 35, and fatigue strength improves nearly one times.Because of it has good heat-resistant anti-fatigue performance and heat conductivility, just causing people's attention as a kind of potential engineering materials.
The application of vermicular cast iron particularly in Europe, has obtained considerable progress.This is people after finding vermicular cast iron, is used widely on the important foundry goods such as engine cylinder-body abroad as a kind of material first.Started the corresponding further climax of further investigation when using again.European Union has also worked up the Vermicular Graphite Cast Iron Standard draft, issues each enterprise, consults on, and is predefined in formally announcement in a year.The U.S. was just separating statistics to the output of vermicular cast iron in the year before last from spheroidal graphite cast iron, shown their attention degree to vermicular cast iron.
Why vermicular cast iron can be used widely, and its reason also is the requirement of prime mover industry to assembly and component.Permanent problem on the engine developing direction is to reduce discharging, reduce oil consumption, improve power and increase comfortableness.Under these four themes, the secondary target of automotive development is: reduce friction (1), for example optimizes bent axle transmission scheme (slipping plane, bearing); (2) weight reduction (light in structureization, material); (3) improve engine rigidity (diesel engine spike pressure); (4) reduce engine volume (tectonic type, use better material); (5) more effective exhaust treatment system; (6) improve combustion method (gasoline direct, diesel oil are mixed well, and use Sweet natural gas).
In addition, along with the raising of specific power, also there is the not enough problem of physical strength in the aluminium alloy under the normal temperature.The way that solves is at the joint bolt place of cylinder body and cylinder cap, step cover and cylinder body castingin screw element now, even web plate.This can gain in weight again undoubtedly, except that cost improves, has increased the technical difficulty of casting simultaneously.Because when the difference of thermal expansivity, especially castingin spare have some little defectives, does not just guarantee the desirable gap that is connected with the aluminium alloy body, thereby in use easily cause and become flexible and fatigue cracking.
In fact from the ore to the finished product, the power consumption of aluminium alloy will be higher than ironcasting.As everyone knows, the vibrationproof ability of ironcasting is much larger than aluminium alloy.Also have only the mechanical property and the high-temperature behavior of ironcasting could satisfy automobile, the especially future development requirement of engine.Therefore, improve, just might recapture the part market that aluminium alloy captures once more fully as long as produce the technology of 2～5mm thin wall iron spare.Vermicular cast iron has the intensity of spheroidal graphite cast iron, compares with graphitic cast iron and similar vibrationproof, the capacity of heat transmission and castability are arranged, and than graphitic cast iron better plasticity and fatigue performance are arranged.Modern iron liquor treating process can guarantee to obtain necessary Vermiculithina China ink, therefore the application on cylinder body has not had technology barrier, and the cylinder body of producing with vermicular cast iron, the power that its engine unit weight is obtained can be lower than aluminium alloy, and this has just impelled the application and the development of vermicular cast iron.
As far back as 1984 and 1987, China just formulated vermicular cast iron-metallographic and pieces of vermicular cast iron industry standard for vermicular cast iron, and revised in 1999, but did not have national standard so far.The production content is more single, is mainly used in products such as vapor pipe, because weight supports and utilizes exhaust gas heat to promote requirements such as igniting in the system, nodulizing rate only needs just can more than 50%.Germany has worked out the vermicular cast iron industry standard in May, 2002, and numbering W50 stipulates that wherein the main wall thickness nodulizing rate of foundry goods will reach more than 80%; Sweden is the property that obtains pure vermicular cast iron, and the vermicular cast iron regulation nodulizing rate of using on its piston ring will reach more than 90%, and this all is that domestic production producer fails to set foot in.
Wriggle iron product from the model machine to the large-scale mass production, and deciding factor is a quality risk.Wriggle iron diesel engine and accessory thereof that present domestic manufacturing firm produces, its nodulizing rate generally only reaches 70% ~ 80%, and yield rate has only about 80%, so its cost is high; The iron nodulizing rate of wriggling of external world-famous marine diesel manufacturing concern can be stabilized in 85% ~ 90%, and therefore, though the continuous prosperity in recent years of China's engine, homemade localization installation rate only is about 35%, and all the other about 65% are external imported product.
The vermicular cast iron that nodulizing rate surpasses more than 80% exists bigger casting production process difficult point, for producing the iron of wriggling that meets this standard, must adopt the advanced person's who possesses the effective procedure control device the process for making iron of wriggling, come to produce stably, with high standards satisfactory foundry goods.
Summary of the invention
The objective of the invention is to present situation, a kind of Cast Iron Production technology of stablizing high nodulizing rate is provided at above-mentioned vermicular cast iron.
The Cast Iron Production technology of stablizing high nodulizing rate of the present invention is to adopt the pig iron to add the vermicular cast iron smelting technique that foundry returns adds steel scrap, and it comprises the step of following order:
(1) raw material of the following mass percent of preparation: 60% ~ 70% the pig iron, 30% ~ 40% foundry returns and steel scrap;
(2) adopting intermediate frequency furnace is melting container, and at first, the melting pig iron adds foundry returns, steel scrap again to molten state, is warming up to 1430 degrees centigrade;
(3) use spectrometric instrument to measure the molten iron constituent content, and adjust constituent content to target zone according to measurement result adding carburelant, alloy; Molten iron constituent content target zone is: mass percent is respectively 3.50% ~ 3.90% C, 2.20% ~ 2.80% Si, 0.40% ~ 0.80% Mn, P≤0.070%, S≤0.020%;
(4) according to the sulphur phosphorus content in the molten iron, accurately weighing is the vermiculizer of molten steel quality 0.04% ~ 0.06% and 0.04% ~ 0.06% nucleating agent, and the iron liquid bag to 800 of preheating Scroll-tupe degree centigrade;
(5) with mass ratio be the side that the nucleating agent of 0.03% ~ 0.05% vermiculizer and 0.03% ~ 0.05% is inserted iron liquid bag bottom; After molten iron is warming up to 1470 degrees centigrade, pours molten iron from the opposite side of iron liquid bag, and add remaining vermiculizer and nucleating agent with stream, molten iron contacts the vermiculizer and the nucleating agent of bottom one side simultaneously, breeds thereby form 2 times;
(6) cast article, processing then eliminates stress foundry goods.
The attach most importance to mixture of yttrium rare earth and silico-calcium magnesium rare earth of described vermiculizer, mass ratio is 2:8; Described nucleating agent adopts the quaternary nucleating agent.
The process for making iron of wriggling of the present invention can obtain nodulizing rate and be stabilized in the iron of wriggling more than 85%.The iron of wriggling of the present invention possesses good thermostability and wear resistance, be the desirable suitable material of automobile, ship engine cylinder block, cylinder cap, piston etc., and can reduce the high performance diesel production cost, improve the diesel engine part performance, improve fuel availability, save energy.
Embodiment
The present invention is further detailed explanation below in conjunction with specific embodiment.
The process of the test of present embodiment is as follows:
The wriggle trade mark of iron of casting is RuT340(JB/T4403-1999).
1, adopts 1.5t intermediate frequency furnace melting raw material.At first add Benxi pig iron 600kg, to molten state, add foundry returns 120kg and steel scrap 280kg again, be warming up to 1430 degrees centigrade, after adopting German SPECTRO M7 spectrum analyzer to analyze the molten iron constituent content, add carburelant, alloy adjustment molten iron constituent content again.
Molten iron constituent content (mass percent) is adjusted into: C is 3.7%, and Si is 2.5%, and Mn is 0.4%, and P is 0.06%, and S is 0.02%.
2, weighing 580g vermiculizer and 580g nucleating agent.Preheat iron liquid stove to 800 degree centigrade, 388g vermiculizer and 388g nucleating agent are placed a side in the iron liquid furnace bottom.
3, molten iron is warming up to 1470 degrees centigrade and comes out of the stove, pour molten iron, and add vermiculizer 192g and nucleating agent 192g with stream from the opposite side of iron liquid stove.
4, casting coupon.
5, casting one group of cylinder head (4).
6, coupon and cylinder head are incubated 2 hours with 680 degrees centigrade of thermal treatments of stove.
7, coupon censorship.
Coupon is detected by country-level laboratory, and the every performance data that detects foundry goods is as follows: nodulizing rate is 85%, and tensile strength is 530MPA, and yield strength is 370Mpa, and hardness value is 207, and elongation is 8%.
The used vermiculizer mixture of yttrium rare earth and silico-calcium magnesium rare earth of attaching most importance in this test, mass ratio is 2:8; Used nucleating agent adopts the quaternary nucleating agent.
Claims (2)
1. a Cast Iron Production technology of stablizing high nodulizing rate is to adopt the pig iron to add the vermicular cast iron smelting technique that foundry returns adds steel scrap, it is characterized in that comprising the step of following order:
(1) raw material of the following mass percent of preparation: 60% ~ 70% the pig iron, 30% ~ 40% foundry returns and steel scrap;
(2) adopting intermediate frequency furnace is melting container, and at first, the melting pig iron adds foundry returns, steel scrap again to molten state, is warming up to 1430 degrees centigrade;
(3) use spectrometric instrument to measure the molten iron constituent content, and adjust constituent content to target zone according to measurement result adding carburelant, alloy; Molten iron constituent content target zone is: mass percent is respectively 3.50% ~ 3.90% C, 2.20% ~ 2.80% Si, 0.40% ~ 0.80% Mn, P≤0.070%, S≤0.020%;
(4) according to the sulphur phosphorus content in the molten iron, accurately weighing is the vermiculizer of molten steel quality 0.04% ~ 0.06% and 0.04% ~ 0.06% nucleating agent, and the iron liquid bag to 800 of preheating Scroll-tupe degree centigrade;
(5) with mass ratio be the side that the nucleating agent of 0.03% ~ 0.05% vermiculizer and 0.03% ~ 0.05% is inserted iron liquid bag bottom; After molten iron is warming up to 1470 degrees centigrade, pours molten iron from the opposite side of iron liquid bag, and add remaining vermiculizer and nucleating agent with stream, molten iron contacts the vermiculizer and the nucleating agent of bottom one side simultaneously, breeds thereby form 2 times;
(6) cast article, processing then eliminates stress foundry goods.
2. the Cast Iron Production technology of stablizing high nodulizing rate according to claim 1 is characterized in that: the attach most importance to mixture of yttrium rare earth and silico-calcium magnesium rare earth of described vermiculizer, and mass ratio is 2:8; Described nucleating agent adopts the quaternary nucleating agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105221750A CN101942598A (en) | 2010-10-28 | 2010-10-28 | Cast iron production process capable of stabilizing high vermicular rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105221750A CN101942598A (en) | 2010-10-28 | 2010-10-28 | Cast iron production process capable of stabilizing high vermicular rate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101942598A true CN101942598A (en) | 2011-01-12 |
Family
ID=43434801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105221750A Pending CN101942598A (en) | 2010-10-28 | 2010-10-28 | Cast iron production process capable of stabilizing high vermicular rate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101942598A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304602A (en) * | 2011-08-23 | 2012-01-04 | 林州市银桥机械制造有限公司 | Vermicular cast iron produced through short process production, production method and application thereof |
| CN102676906A (en) * | 2012-06-20 | 2012-09-19 | 丹阳市锦雄机械制造有限公司 | Preparation method of compacted graphite cast iron |
| CN102690986A (en) * | 2012-05-25 | 2012-09-26 | 南车戚墅堰机车车辆工艺研究所有限公司 | Smelting method for medium-thin wall cast-state nickel-free low-temperature ductile cast iron |
| CN103131942A (en) * | 2011-11-30 | 2013-06-05 | 山东省源通机械股份有限公司 | Vermicular graphite cast iron with high percent of vermiculation of combustion motor cylinder body and cylinder cover and preparation method |
| CN104209507A (en) * | 2014-08-08 | 2014-12-17 | 含山县全兴内燃机配件有限公司 | Internal combustion engine cylinder cover for ship |
| CN104295856A (en) * | 2014-08-18 | 2015-01-21 | 安徽惠明机械制造有限公司 | Wrapping device outside water feeding device |
| CN105755360A (en) * | 2016-05-12 | 2016-07-13 | 河南工程学院 | Preparation technology of vermicular cast iron with high pearlite and stable vermiculation |
| CN105821290A (en) * | 2016-03-28 | 2016-08-03 | 繁昌县天和机械有限公司 | Method for preparing nanometer modified high-strength vermicular graphite cast iron |
| CN107779735A (en) * | 2016-08-29 | 2018-03-09 | 扬州扬子江宝云缸套有限公司 | A kind of preparation method of high intensity vermicular cast iron cylinder sleeve |
| CN108165702A (en) * | 2018-01-05 | 2018-06-15 | 广东富华铸锻有限公司 | A kind of intermediate frequency furnace melting Technology of Steel Castings |
| CN108247066A (en) * | 2018-01-11 | 2018-07-06 | 昆明理工大学 | It is a kind of using 3D printing technique to the method for vermicular cast iron casting parts defect repair |
| CN115331406A (en) * | 2022-07-21 | 2022-11-11 | 南昌大学 | A kind of vermicular iron brake drum molten iron quality early warning system and early warning method |
| CN115608911A (en) * | 2022-11-04 | 2023-01-17 | 潍柴动力股份有限公司 | A kind of preparation method of easy-processing vermicular graphite cast iron |
-
2010
- 2010-10-28 CN CN2010105221750A patent/CN101942598A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304602A (en) * | 2011-08-23 | 2012-01-04 | 林州市银桥机械制造有限公司 | Vermicular cast iron produced through short process production, production method and application thereof |
| CN103131942B (en) * | 2011-11-30 | 2016-05-11 | 山东省源通机械股份有限公司 | High nodulizing rate vermicular cast iron and the method for making of IC engine cylinder body, cylinder cover |
| CN103131942A (en) * | 2011-11-30 | 2013-06-05 | 山东省源通机械股份有限公司 | Vermicular graphite cast iron with high percent of vermiculation of combustion motor cylinder body and cylinder cover and preparation method |
| CN102690986A (en) * | 2012-05-25 | 2012-09-26 | 南车戚墅堰机车车辆工艺研究所有限公司 | Smelting method for medium-thin wall cast-state nickel-free low-temperature ductile cast iron |
| CN102676906A (en) * | 2012-06-20 | 2012-09-19 | 丹阳市锦雄机械制造有限公司 | Preparation method of compacted graphite cast iron |
| CN104209507A (en) * | 2014-08-08 | 2014-12-17 | 含山县全兴内燃机配件有限公司 | Internal combustion engine cylinder cover for ship |
| CN104295856A (en) * | 2014-08-18 | 2015-01-21 | 安徽惠明机械制造有限公司 | Wrapping device outside water feeding device |
| CN105821290A (en) * | 2016-03-28 | 2016-08-03 | 繁昌县天和机械有限公司 | Method for preparing nanometer modified high-strength vermicular graphite cast iron |
| CN105755360A (en) * | 2016-05-12 | 2016-07-13 | 河南工程学院 | Preparation technology of vermicular cast iron with high pearlite and stable vermiculation |
| CN107779735A (en) * | 2016-08-29 | 2018-03-09 | 扬州扬子江宝云缸套有限公司 | A kind of preparation method of high intensity vermicular cast iron cylinder sleeve |
| CN108165702A (en) * | 2018-01-05 | 2018-06-15 | 广东富华铸锻有限公司 | A kind of intermediate frequency furnace melting Technology of Steel Castings |
| CN108247066A (en) * | 2018-01-11 | 2018-07-06 | 昆明理工大学 | It is a kind of using 3D printing technique to the method for vermicular cast iron casting parts defect repair |
| CN115331406A (en) * | 2022-07-21 | 2022-11-11 | 南昌大学 | A kind of vermicular iron brake drum molten iron quality early warning system and early warning method |
| CN115331406B (en) * | 2022-07-21 | 2024-02-09 | 南昌大学 | A kind of early warning system and early warning method for molten iron quality of vermicular iron brake drum |
| CN115608911A (en) * | 2022-11-04 | 2023-01-17 | 潍柴动力股份有限公司 | A kind of preparation method of easy-processing vermicular graphite cast iron |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101942598A (en) | Cast iron production process capable of stabilizing high vermicular rate | |
| CN102796939B (en) | Method for vermicular cast iron by using mixed vermiculizer | |
| CN104846265B (en) | A kind of ultralow temperature austenite abrasion-proof magnesium iron material and preparation method thereof | |
| CN101381838A (en) | Vermicular cast iron cylinder liner and preparation method thereof | |
| CN104195423B (en) | The low silicon of high-carbon is containing niobium cast iron brake disk and preparation method thereof | |
| CN105063471A (en) | Low-alloy gray cast iron material for truck brake drum and preparation method thereof | |
| CN107043841B (en) | A kind of spheroidization and inoculation treatment process of spheroidal graphite cast-iron | |
| CN103131942B (en) | High nodulizing rate vermicular cast iron and the method for making of IC engine cylinder body, cylinder cover | |
| CN102080177A (en) | Vanadium-titanium vermicular graphite cast iron | |
| CN110295312A (en) | A kind of low-temperature ball spheroidal graphite cast iron and its production technology and application | |
| CN102888551A (en) | High-temperature-resistant antioxidant exhaust manifold nodular cast iron and preparation method thereof | |
| US20120301346A1 (en) | Cgi cast iron and production method for the same | |
| CN1477223B (en) | Cast-iron alloy | |
| CN101967599B (en) | Vermiculizer for producing vermicular cast iron cylinder sleeve by centrifugal casting and preparation method thereof | |
| CN102317480A (en) | Method to obtain a high resistance gray iron alloy for combustion engines and general casts | |
| CN109536664B (en) | Vermicular graphite cast iron vortex plate and production process thereof | |
| CN101565793A (en) | Alloy ductile iron crankshaft and heat treatment process thereof | |
| CN105970075A (en) | Technique for preparing vermicular cast iron material | |
| CN109609835B (en) | High-toughness wear-resistant nodular cast iron and preparation process and application thereof | |
| CN117512430A (en) | Vermicular cast iron smelting and casting process, vermicular cast iron and cylinder cover casting | |
| CN114411049B (en) | Low-cost and high-strength ferritic nodular cast iron and preparation method and application thereof | |
| CN109594007B (en) | Vermicular graphite cast iron and preparation process and application thereof | |
| CN1702182A (en) | Production method for high toughness ductile cast iron | |
| CN1693525A (en) | Alloy gray iron material for automobile panel mold and preparation method thereof | |
| CN110066958B (en) | Production process of copper-chromium alloy vermicular graphite cast iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20110112 |