CN103556032A - Method for preparing ultrathin-walled vermicular graphite cast iron - Google Patents
Method for preparing ultrathin-walled vermicular graphite cast iron Download PDFInfo
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- CN103556032A CN103556032A CN201310521667.1A CN201310521667A CN103556032A CN 103556032 A CN103556032 A CN 103556032A CN 201310521667 A CN201310521667 A CN 201310521667A CN 103556032 A CN103556032 A CN 103556032A
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Abstract
The invention discloses a method for preparing an ultrathin-walled vermicular graphite cast iron. The method comprises the steps of: melting the raw materials such as Q10 pig iron, waste steel, ferrotitanium (30% of titanium) and ferromolybdenum (60% of Mo) in a cupola, performing element adjustment when the temperature is kept at 1400DEG C, adding a vermicular agent and an inoculating agent into a ladle to complete vermicularization and first inoculation; performing second inoculation when the height of the iron liquid in the molten iron reaches two thirds of the ladle; when pouring the molten iron, adding the inoculating agent for performing third inoculation; and cooling to obtain the vermicular graphite cast iron which comprises the following elements in percentage by weight: 3.0%-3.6% of C, 3.9%-4.3% of Si, 0.3%-0.6% of Mn, 0.01%-0.02% of S, 0.01-0.02% of P, 0.15%-0.22% of Ti and 0.4%-0.7% of Mo. The elongation percentage of the vermicular graphite cast iron is improved to 6% from originally 3%, and the vermicular graphite cast iron is applicable to thin-walled production.
Description
Technical field
The present invention relates to a kind of preparation method of vermicular cast iron, particularly a kind of preparation method of the vermicular cast iron for the manufacture of ultra-thin-wall.
Background technology
Vermicular cast iron is the new engineering material developing rapidly over nearly 30 years, and its castability approaches graphitic cast iron, and its tensile strength, fatigue strength and yield strength are the twices of graphitic cast iron, and impelling strength is four times of graphitic cast iron.The research of vermicular cast iron is reached to higher level both at home and abroad, but the current key issue that affects vermicular cast iron development remains production stability problem.The Jetta car vapor pipe working temperature that one vapour is introduced changes through between the normal temperature to 700 ℃ of being everlasting, while manufacturing with graphitic cast iron, be easy to cracking, therefore, adopting material is ferritic vermicular cast iron, its wall thickness requires as 316mm ± 014mm, belong to ultra-thin-wall pieces of vermicular cast iron, for this ultra-thin-wall vermicular cast iron, China also lacks deeply systematically research.In ultra-thin-wall foundry goods, molten iron is among very large kinetic undercooling, and the speed of cooling of foundry goods is very large, is prone to carbide, in order to suppress the formation of carbide, just must add and promote graphited element, and carry out post inoculation.But when speed of cooling is very large, graphite is grown up by spherical growth mode, becomes spheroidal graphite cast iron.Therefore prior art cannot be produced the vermicular cast iron that meets thin-walled production requirement.
Summary of the invention
The invention discloses a kind of preparation method of the vermicular cast iron for the manufacture of ultra-thin-wall, to improve the vermicular cast iron of prior art production, cannot adapt to the defect of the particular requirement of some thin-walled occasion mechanical part.
For achieving the above object, the present invention adopts following technical scheme:
A kind of preparation method of the vermicular cast iron for the manufacture of ultra-thin-wall, the mass percent of described vermicular cast iron is C:3.0%～3.6%, Si:3.9%～4.3%, Mn:0.3%～0.6%,, S:0.01%～0.02%, P:0.01%～0.02%, Ti:0.15%～0.22%, Mo:0.4%～0.7%, surplus is that Fe is inevitably micro-with other.
A kind of preparation method of the vermicular cast iron for the manufacture of ultra-thin-wall:
(1) raw material melting: take the Q10 pig iron, steel scrap, ferrotianium (30%Ti), molybdenum-iron (60%Mo) and drop in order melting in cupola furnace by predetermined formulation, in fusion process, guarantee that molten iron temperature is 1400 °, after melting, detect in molten iron each constituent content and adjust each constituent content until meet formula requirement, the wriggling of tapping a blast furnace when iron water amount reaches required weight in hot metal ladle processed;
(2) wriggling processing and for the first time inoculation; At nodularization bag, adding total mass is 0.6% vermiculizer of iron liquid quality and quality be equivalent to come out of the stove 0.25～0.35% the nucleating agent of iron liquid quality of coming out of the stove, and the iron liquid of coming out of the stove enters after nodularization bag, and its wriggling is processed and inoculation for the first time.
(3) inoculation for the second time; When iron liquid height goes out to hot metal ladle 2/3 in hot metal ladle, be evenly sprinkled into quality be equivalent to come out of the stove 0.3～0.5% nucleating agent of iron liquid quality in iron notch, iron liquid enters after iron notch, to its inoculation for the second time;
(4) inoculation for the third time; During iron liquid casting, with iron liquid, again add 0.1～0.5% nucleating agent that quality is equivalent to iron liquid quality with to its inoculation for the third time; After cast, obtain vermicular cast iron;
Wherein, vermiculizer is commercially available magnesium-rare earth-silicon vermiculizer.
The moiety of nucleating agent is: Si:72～76%, and Ca:0.1～1.0%, Al:0.1～0.5%, surplus is Fe and inevitably micro-.
specific embodiment
Below in conjunction with specific embodiment, the present invention is further described.
The vermicular cast iron main composition element prepared by method of the present invention is: C, Si, Mn, S, P, Ti, Mo, the raw material of above-mentioned element comes from the Q10 pig iron, steel scrap, ferrotianium (30%Ti), molybdenum-iron (60%Mo).Foundry returns refers to the waste casting producing after spheroidal graphite cast iron of the present invention smelting, and utilizes foundry returns cost-saving as the raw material energy of again smelting vermicular cast iron, reaches the effect of recycle.
Embodiment 1
For the manufacture of a vermicular cast iron for ultra-thin-wall, mass percent is: C:3.4%, and Si:3.9%, Mn:0.3%,, S:0.01%, P:0.01%, Ti:0.18%, Mo:0.6% surplus is Fe and inevitably micro-.
Embodiment 2
For the manufacture of a vermicular cast iron for ultra-thin-wall, mass percent is: C:3.5%, and Si:4.1%, Mn:0.5%, S:0.01%, P:0.01%, Ti:0.15%, Mo:0.4%, surplus is Fe and inevitably micro-.
The preparation method of the above-mentioned vermicular cast iron for the manufacture of ultra-thin-wall:
(1) raw material melting: take the Q10 pig iron, steel scrap, ferrotianium (30%Ti), molybdenum-iron (60%Mo) and drop in order melting in cupola furnace by predetermined formulation, in fusion process, guarantee that molten iron temperature is 1400 °, after melting, detect in molten iron each constituent content and adjust each constituent content until meet formula requirement, the wriggling of tapping a blast furnace when iron water amount reaches required weight in hot metal ladle processed;
(2) wriggling processing and for the first time inoculation; At nodularization bag, adding total mass is 0.6% vermiculizer of iron liquid quality and quality be equivalent to come out of the stove 0.25～0.35% the nucleating agent of iron liquid quality of coming out of the stove, and the iron liquid of coming out of the stove enters after nodularization bag, and its wriggling is processed and inoculation for the first time.
(3) inoculation for the second time; When iron liquid height goes out to hot metal ladle 2/3 in hot metal ladle, be evenly sprinkled into quality be equivalent to come out of the stove 0.3～0.5% nucleating agent of iron liquid quality in iron notch, iron liquid enters after iron notch, to its inoculation for the second time;
(4) inoculation for the third time; During iron liquid casting, with iron liquid, again add 0.1～0.5% nucleating agent that quality is equivalent to iron liquid quality with to its inoculation for the third time; After cast, obtain vermicular cast iron;
Wherein, vermiculizer is commercially available magnesium-rare earth-silicon vermiculizer.
The moiety of nucleating agent is: Si:72～76%, and Ca:0.1～1.0%, Al:0.1～0.5%, surplus is Fe and inevitably micro-.
Claims (3)
1. the preparation method for the manufacture of the vermicular cast iron of ultra-thin-wall, it is characterized in that: the mass percent of described vermicular cast iron is C:3.0%～3.6%, Si:3.9%～4.3%, Mn:0.3%～0.6%, S:0.01%～0.02%, P:0.01%～0.02%, Ti:0.15%～0.22%, Mo:0.4%～0.7%, surplus is that Fe is inevitably micro-with other, a kind of preparation method of the vermicular cast iron for the manufacture of ultra-thin-wall:
(1) raw material melting: take the Q10 pig iron, steel scrap, ferrotianium (30%Ti), molybdenum-iron (60%Mo) and drop in order melting in cupola furnace by predetermined formulation, in fusion process, guarantee that molten iron temperature is 1400 °, after melting, detect in molten iron each constituent content and adjust each constituent content until meet formula requirement, the wriggling of tapping a blast furnace when iron water amount reaches required weight in hot metal ladle processed;
(2) wriggling processing and for the first time inoculation; At nodularization bag, adding total mass is 0.6% vermiculizer of iron liquid quality and quality be equivalent to come out of the stove 0.25～0.35% the nucleating agent of iron liquid quality of coming out of the stove, and the iron liquid of coming out of the stove enters after nodularization bag, and its wriggling is processed and inoculation for the first time;
(3) inoculation for the second time; When iron liquid height goes out to hot metal ladle 2/3 in hot metal ladle, be evenly sprinkled into quality be equivalent to come out of the stove 0.3～0.5% nucleating agent of iron liquid quality in iron notch, iron liquid enters after iron notch, to its inoculation for the second time;
(4) inoculation for the third time; During iron liquid casting, with iron liquid, again add 0.1～0.5% nucleating agent that quality is equivalent to iron liquid quality with to its inoculation for the third time; After cast, obtain vermicular cast iron;
Wherein, vermiculizer is commercially available magnesium-rare earth-silicon vermiculizer, and the moiety of nucleating agent is: Si:72～76%, and Ca:0.1～1.0%, Al:0.1～0.5%, surplus is Fe and inevitably micro-.
2. the preparation method of a kind of vermicular cast iron for the manufacture of ultra-thin-wall according to claim 1, it is characterized in that: the mass percent of this vermicular cast iron is: C:3.4%, Si:3.9%, Mn:0.3%,, S:0.01%, P:0.01%, Ti:0.18%, Mo:0.6% surplus is Fe and inevitably micro-.
3. the preparation method of a kind of vermicular cast iron for the manufacture of ultra-thin-wall according to claim 1, is characterized in that: C:3.5%, Si:4.1%, Mn:0.5%, S:0.01%, P:0.01%, Ti:0.15%, Mo:0.4%, surplus is Fe and inevitably micro-.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506440A (en) * | 2015-12-15 | 2016-04-20 | 山东汇丰铸造科技股份有限公司 | Nodular cast iron winding drum high in strength and ductility and preparation method thereof |
| CN107447158A (en) * | 2017-07-17 | 2017-12-08 | 常熟市精工模具制造有限公司 | The preparation method of high alloy black vermicular cast iron glass mold material |
| CN110331331A (en) * | 2019-07-26 | 2019-10-15 | 天津达祥精密工业有限公司 | A kind of high silicon molybdenum ferrite Heat-Resistant Compacted Graphite Iron and the preparation method and application thereof |
| CN111187973A (en) * | 2020-03-02 | 2020-05-22 | 锦州捷通铁路机械股份有限公司 | High-elongation RuT400 vermicular graphite cast iron and production process thereof |
| CN112626409A (en) * | 2020-12-15 | 2021-04-09 | 江苏泽茗精密机械制造股份有限公司 | Preparation process of high-temperature-resistant vermicular graphite cast iron for turbine shell |
-
2013
- 2013-10-30 CN CN201310521667.1A patent/CN103556032A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506440A (en) * | 2015-12-15 | 2016-04-20 | 山东汇丰铸造科技股份有限公司 | Nodular cast iron winding drum high in strength and ductility and preparation method thereof |
| CN107447158A (en) * | 2017-07-17 | 2017-12-08 | 常熟市精工模具制造有限公司 | The preparation method of high alloy black vermicular cast iron glass mold material |
| CN110331331A (en) * | 2019-07-26 | 2019-10-15 | 天津达祥精密工业有限公司 | A kind of high silicon molybdenum ferrite Heat-Resistant Compacted Graphite Iron and the preparation method and application thereof |
| CN111187973A (en) * | 2020-03-02 | 2020-05-22 | 锦州捷通铁路机械股份有限公司 | High-elongation RuT400 vermicular graphite cast iron and production process thereof |
| CN112626409A (en) * | 2020-12-15 | 2021-04-09 | 江苏泽茗精密机械制造股份有限公司 | Preparation process of high-temperature-resistant vermicular graphite cast iron for turbine shell |
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Application publication date: 20140205 |