CN104985142A - High-nickel austenite nodular cast iron spheroidizing method and spheroidizing ladle - Google Patents
High-nickel austenite nodular cast iron spheroidizing method and spheroidizing ladle Download PDFInfo
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- CN104985142A CN104985142A CN201510399434.8A CN201510399434A CN104985142A CN 104985142 A CN104985142 A CN 104985142A CN 201510399434 A CN201510399434 A CN 201510399434A CN 104985142 A CN104985142 A CN 104985142A
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Abstract
The invention discloses a high-nickel austenite nodular cast iron spheroidizing method. The austenite nodular cast iron spheroidizing method comprises the steps of stokehole spheroidizing, deslagging and pouring. The method is characterized in that during stokehole spheroidizing, a spheroidizing agent, some nucleating agents and a covering agent are sequentially laid on a detonation area of a spheroidizing ladle, then the detonation area is covered with a cover plate made of the same material as molten iron, and then the molten iron is poured for spheroidizing; and (2) the molten iron obtained after stokehole spheroidizing is poured into a flat bottom ladle with the bottom with the rest of the nucleating agents, and deslagging and pouring are performed after inoculation is performed. Compared with traditional spheroidizing, the consumption of the spheroidizing agent can be decreased, the amount of graphite of high-nickel austenite nodular cast iron is increased by at least 30-50%, the level of spheroidization reaches the first grade, and particularly it is ensured that the rate of spheroidizing of a thermal center and a thick portion can reach at least 90%.
Description
Technical field
The invention belongs to spheroidal graphite cast-iron field, be specifically related to a kind of nodulizing process and nodularization dedicated processes bag of high-nickel austenite nodular cast iron.
Background technology
The lifting of auto manufacturing technology, brings new challenge to the technology of engine.Discharge capacity is miniaturized, under the prerequisite that power does not decline, improves on the contrary, adopts turbocharging technology will be trend.After power improves in addition, the temperature of waste gas improves, and this has higher requirement to critical component turbocharger housing material property in pressure charging system.
Traditional high-nickel austenite nodular cast iron spheroidising bag generally adopts dam-type pack processing, as shown in Figure 1, the side that nodulizer is placed on dykes and dams (is commonly called as fuze action zone, in Fig. 1 2), molten iron then pours opposite side and (namely pours district, in Fig. 1 1), this dam-type pack processing is adopted to there is the nodulizer burst time uncontrollable, the problem of nodularization instability, have impact on the effect of nodularization, Oxygen potential can only reach secondary, especially at thick large and heat energy-saving position, the roundness of graphite is poorer, has had a strong impact on the performance of product.
Summary of the invention
The object of the invention is the above-mentioned defect overcoming prior art, a kind of high-nickel austenite nodular cast iron nodulizing process and spheroidising bag of improvement are provided.
It is as follows that the present invention realizes the technical scheme that above-mentioned purpose adopts:
A kind of high-nickel austenite nodular cast iron nodulizing process, step comprises stokehold spheroidising, removes slag, pours into a mould, and its feature is:
(1) during the spheroidising of stokehold: inovulant, the coverture of nodulizer, part are layered on the fuze action zone of spheroidising bag successively, then cover the cover plate identical with molten iron material, then pour molten iron into and carry out spheroidising;
(2) molten iron through stokehold spheroidising is poured into the flat bag that bottom is covered with residue inovulant, remove slag again after inoculation, cast.
Further, the addition of inovulant is the 1/3-1/2 of the total consumption of inovulant in step (1).
For a high-nickel austenite nodular cast iron spheroidising bag for said method, comprise inclusion, its feature is, is provided with semicircle boss bottom inclusion, and described semicircle boss is provided with cylindrical pit, and described cylindrical pit forms fuze action zone.
Accompanying drawing explanation
Fig. 1 is traditional spheroidising pack arrangement schematic diagram.
Fig. 2 is spheroidising pack arrangement schematic diagram of the present invention.
Fig. 3 is spheroidising bag using state schematic diagram of the present invention.
Fig. 4 is flat bag.
Fig. 5 is the contrast metallograph of common position graphite before and after spheroidising improves.
Fig. 6 is the contrast metallograph of common position Oxygen potential before and after spheroidising improves.
Fig. 7 is the contrast metallograph of thick large part Oxygen potential before and after spheroidising improves.
Fig. 8 is the contrast metallograph of heat energy-saving position Oxygen potential before and after spheroidising improves.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further details.
The traditional nodulizing process of high-nickel austenite nodular cast iron is: the fuze action zone (in fan-shaped) nodulizer, inovulant and coverture being layered on successively dam-type spheroidising bag as shown in Figure 1, then molten iron is poured into pack processing, carry out stokehold spheroidising, remove slag after spheroidising, cast.
The present invention improves above-mentioned conventional method and spheroidising bag, and to improve nodularization effect, concrete improvement is as follows:
Different from traditional dam-type spheroidising bag, the present invention improves fuze action zone, and the spheroidising bag after improvement as shown in Figure 2, comprise inclusion, bottom inclusion, be provided with semicircle boss 3, described semicircle boss is provided with cylindrical pit 31, described cylindrical pit forms fuze action zone.Spheroidising bag after adopting the present invention to improve, the burst time of nodulizer is controlled, and nodulizer consumption can reduce 10% compared with tradition, and the absorptivity of nodulizer can be increased to more than 85%.
Nodulizing process detailed process of the present invention is:
(1) stokehold spheroidising: as shown in Figure 3, nodulizer (reducing about 10% by conventional amount to add), the inovulant (adding by the 1/3-1/2 of total amount) of part, coverture are layered in the cylindrical pit of spheroidising bag successively, then on pit, cover the cover plate identical with molten iron material, then pour molten iron into and carry out spheroidising;
(2) remaining inovulant is layered in flat bag (as shown in Figure 4);
(3) pour the molten iron through stokehold spheroidising into flat bag, remove slag again after inoculation, cast.
The present invention all adopts traditional nodulizer and inovulant, and nodulizer consumption can reduce outside about 10% interpolation by conventional amount, and the total consumption of inovulant is suitable with conventional amount.Coverture is the particle identical with pending molten iron material.
Embodiment 1
To process the Form in High Nickel Austenite Nodular Cast Iron D5S of 500kg at every turn,
Spheroidizing process of the present invention is as follows:
(1) add nodulizer 3.0-3.5kg successively at spheroidising bag, inovulant 0.9-1.5kg, coverture 3kg, covers cover plate, then pours molten iron (the nodularization time is more than 20 seconds) into, spheroidization treatment temperature 1600 DEG C.
(2) in flat bag, add remaining 2.1-1.5kg inovulant (total amount is 3kg), the molten iron after spheroidising is poured into, after the inoculation of 5-20 second, cast of skimming.
Tradition nodulizing process:
(1) add nodulizer 3.5-4kg successively at spheroidising bag, inovulant 3kg, then pour molten iron (will stop in 15 seconds nodularization time) into, spheroidization treatment temperature 1600 DEG C.
Compared with traditional treatment method, adopt spheroidising bag of the present invention, increase the coverture identical with molten iron material simultaneously, and original inovulant part of adding in spheroidising bag is delayed add in flat bag, to postpone to breed, after above-mentioned process, the graphite of high-nickel austenite nodular cast iron can increase more than 30-50% (as shown in Figure 5, A is conventional method, B is the inventive method), Oxygen potential rank of the present invention reaches one-level, particularly ensure the Oxygen potential more than 90% of thermal center and thick large part, the roundness of graphite obviously improves (as shown in figs 6-8, in each figure, A is conventional method, B is the inventive method).
Claims (3)
1. a high-nickel austenite nodular cast iron nodulizing process, step comprises stokehold spheroidising, removes slag, pours into a mould, and it is characterized in that:
(1) during the spheroidising of stokehold: inovulant, the coverture of nodulizer, part are layered on the fuze action zone of spheroidising bag successively, then cover the cover plate identical with molten iron material, then pour molten iron into and carry out spheroidising;
(2) molten iron through stokehold spheroidising is poured into the flat bag that bottom is covered with residue inovulant, remove slag again after inoculation, cast.
2. high-nickel austenite nodular cast iron nodulizing process according to claim 1, it is characterized in that, the addition of inovulant is the 1/3-1/2 of the total consumption of inovulant in step (1).
3. the high-nickel austenite nodular cast iron spheroidising bag for method described in claim 1, comprise inclusion, it is characterized in that, bottom inclusion, be provided with semicircle boss, described semicircle boss is provided with cylindrical pit, and described cylindrical pit forms fuze action zone.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114130968A (en) * | 2021-10-29 | 2022-03-04 | 中钢集团邢台机械轧辊有限公司 | Method for improving yield of inoculation nodulizer of iron casting product |
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| US4515353A (en) * | 1983-03-24 | 1985-05-07 | Sperry Corporation | Tundish cover for ductile iron treatment |
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| CN102000785A (en) * | 2010-11-30 | 2011-04-06 | 刘之增 | Covering technology of ladle nodulizer nodulized by pour-over process |
| CN102102136A (en) * | 2011-03-07 | 2011-06-22 | 衡阳中钢衡重铸锻有限公司 | As-cast high-toughness ferrite nodular iron and production method thereof |
| CN103352161A (en) * | 2013-07-23 | 2013-10-16 | 四川省祥业机械铸造有限公司 | Ductile iron casting and casting process thereof |
| CN103725949A (en) * | 2013-07-04 | 2014-04-16 | 陕西柴油机重工有限公司 | Method for producing high-Ni austenite ductile iron exhaust pipe |
| CN104120332A (en) * | 2014-07-31 | 2014-10-29 | 大连金州茂隆实业有限公司 | High-strength high-toughness ductile cast iron 600-10 and production method thereof |
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2015
- 2015-07-09 CN CN201510399434.8A patent/CN104985142A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4515353A (en) * | 1983-03-24 | 1985-05-07 | Sperry Corporation | Tundish cover for ductile iron treatment |
| CN101994053A (en) * | 2009-08-12 | 2011-03-30 | 大连核心铸造技术工程研究所 | Nodular cast iron ultrafine particle nodularizer |
| CN201537693U (en) * | 2009-09-28 | 2010-08-04 | 河南欧迪艾铸造有限公司 | Ductile iron spheroidization processing package |
| CN102000785A (en) * | 2010-11-30 | 2011-04-06 | 刘之增 | Covering technology of ladle nodulizer nodulized by pour-over process |
| CN102102136A (en) * | 2011-03-07 | 2011-06-22 | 衡阳中钢衡重铸锻有限公司 | As-cast high-toughness ferrite nodular iron and production method thereof |
| CN103725949A (en) * | 2013-07-04 | 2014-04-16 | 陕西柴油机重工有限公司 | Method for producing high-Ni austenite ductile iron exhaust pipe |
| CN103352161A (en) * | 2013-07-23 | 2013-10-16 | 四川省祥业机械铸造有限公司 | Ductile iron casting and casting process thereof |
| CN104120332A (en) * | 2014-07-31 | 2014-10-29 | 大连金州茂隆实业有限公司 | High-strength high-toughness ductile cast iron 600-10 and production method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114130968A (en) * | 2021-10-29 | 2022-03-04 | 中钢集团邢台机械轧辊有限公司 | Method for improving yield of inoculation nodulizer of iron casting product |
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Application publication date: 20151021 |