CN103484591A - Inoculation method for improving tensile strength of gray iron - Google Patents
Inoculation method for improving tensile strength of gray iron Download PDFInfo
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- CN103484591A CN103484591A CN201310372766.8A CN201310372766A CN103484591A CN 103484591 A CN103484591 A CN 103484591A CN 201310372766 A CN201310372766 A CN 201310372766A CN 103484591 A CN103484591 A CN 103484591A
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to an inoculation method for improving tensile strength of gray iron. One or more of following alloys in percentage by weight is/are added in an inoculation agent in a 75Si-Fe ladle adopted during tapping: 0.3-0.5% of ferromanganese, 0.2-0.5% of ordinary carbon steel scrap and 0.15-0.4% of rare earth ferrosilicon; simultaneously, after the completion of inoculation, the tapping temperature is 10-20 DEG C higher than the conventional tapping temperature of 1450-1550 DEG C. According to the inoculation method disclosed by the invention, on the basis of the original inoculation agent 75Si-Fe, materials added into the ladle during tapping for inoculation are improved, and components of molten iron are properly adjusted, so that the tensile strength of gray cast iron is further improved by 10-60MPa on the original basis on the premise of ensuring that the target components are the same with those of the original process.
Description
Technical field
The present invention relates to a kind of inoculation method that improves gray iron tensile strength, in particular, relate to a kind of inoculation method that adds the raising gray iron tensile strength of one or more alloy materials on the basis of original nucleating agent.
Background technology
In the production of graphitic cast iron, such in conventional production process: after molten iron is melting, tap a blast furnace before, need be by hot metal composition in stove other alloying elements except element silicon, as carbon, manganese, phosphorus, sulphur etc. (sometimes also having chromium, copper, nickel etc.) are adjusted in the scope of target call, and the content of silicon need be lower than the 0.2-0.6%(of target call depending on nucleating agent silicon content and pregnant amount).
Inoculation to molten iron is generally carried out several times, but breed in the bag in the process of tapping a blast furnace, is necessary, and the nucleating agent that is about to iron water amount 0.3-0.6% is placed on the bag end or together pours in bag with molten iron stream, completes inoculation in the bag of molten iron.
The inoculation of graphitic cast iron generally adopts the 75Si-Fe nucleating agent, sometimes in order to improve pregnant effect, to extend and breed fall time, often adopt " the effective inoculation agent " of selling on market, add other elements of some amount on the basis of 75Si-Fe, main as barium, calcium, strontium, aluminium, zirconium etc., single allocating into arranged, also have compound several element to add simultaneously.No matter adopt which kind of nucleating agent, the foundry goods of the molten iron cast after breeding, tensile strength all has raising in various degree.
Summary of the invention
The object of the invention is to, for above-mentioned defect, a kind of inoculation method that improves gray iron tensile strength is provided, it is on the basis of original nucleating agent, the interpolation material bred in the time bag of tapping a blast furnace is improved, and the composition of molten iron has been carried out to suitable adjustment, guaranteeing to make the tensile strength of graphitic cast iron improve again 10-60 MPa on original basis under the prerequisite that target component is identical with original technique.
In order to reach the object of the invention, the technical scheme of taking is: a kind of inoculation method that improves gray iron tensile strength, add the alloy of following one or more weight percentage in the 75Si-Fe bag adopted when tapping a blast furnace in nucleating agent: these alloys are respectively the ferromanganese of 0.3-0.5%, the normal carbon steel scrap of 0.2-0.5%, the rare earth ferrosilicon of 0.15-0.4%, simultaneously after having bred, tapping temperature than conventional tapping temperature 1450-1550 ℃ higher than 10-20 ℃.
Due to the difference of each plant produced condition, and the difference of product, technological temperature is may difference larger, and general tapping temperature is at 1450-1550 ℃, the thin-wall part capping, and thick large removes the limit.
Further, need, according to adding the weight of alloy need the content of the carbon in molten iron, silicon, manganese be appropriately adjusted, to guarantee that its content is in the scope of target call.
Further, the above-mentioned alloy material lumpiness added is identical with the lumpiness of nucleating agent.
Further, the normal carbon steel scrap added should carry out Shot Blasting in advance, guarantee the surface without oily, rustless, without other impurity.
Further, the normal carbon steel scrap added is toasted in case of necessity, removes surface-moisture.
The present invention compared with prior art has following beneficial effect: the present invention is on the basis of original nucleating agent 75Si-Fe, the interpolation material bred in the time bag of tapping a blast furnace is improved, and the composition of molten iron has been carried out to suitable adjustment, guaranteeing to make the tensile strength of graphitic cast iron improve again 10-60 MPa on original basis under the prerequisite that target component is identical with original technique.
Embodiment
In order to set forth in more detail the raising to gray iron tensile strength of the present invention and common process method, we adopt forms mode to carry out comparative illustration.
Table one: the tensile strength contrast of the present invention and common process method
As can be seen from Table I, above-mentioned alloy can be single adding, also optionally multiple combination adds, single alloy adds effect smaller, the improvement value of tensile strength is more lower slightly, is generally 10-20 MPa, and when composite alloy adds, effect is better, the tensile strength improvement value is larger, is generally 30-60 MPa.Add in above-mentioned alloy bag tapping temperature after having bred at 1470-1560 ℃.
From above table, can find out, added in the situation of single alloy or multiple alloy, the tensile strength of gray iron has obviously improved 10-60 MPa.
Should carry out in advance Shot Blasting to the normal carbon steel scrap added in above-mentioned each embodiment, guarantee the surface without oily, rustless, without other impurity, toasted in case of necessity, the removal surface-moisture.The alloy material lumpiness that requirement adds simultaneously is identical with the lumpiness of nucleating agent, and the content of the carbon in molten iron, silicon, manganese is appropriately adjusted, and guarantees that its content is in the scope of target call.
Claims (5)
1. an inoculation method that improves gray iron tensile strength, it is characterized in that, add the alloy of following one or more weight percentage in the 75Si-Fe bag adopted when tapping a blast furnace in nucleating agent: these alloys are respectively the ferromanganese of 0.3-0.5%, the normal carbon steel scrap of 0.2-0.5%, the rare earth ferrosilicon of 0.15-0.4%, simultaneously after having bred, tapping temperature than conventional tapping temperature 1450-1550 ℃ higher than 10-20 ℃.
2. a kind of inoculation method that improves gray iron tensile strength according to claim 1, is characterized in that, needs, according to adding the weight of alloy need the content of the carbon in molten iron, silicon, manganese be appropriately adjusted, to guarantee that its content is in the scope of target call.
3. a kind of inoculation method that improves gray iron tensile strength according to claim 2, is characterized in that, the above-mentioned alloy material lumpiness added is identical with the lumpiness of nucleating agent.
4. a kind of inoculation method that improves gray iron tensile strength according to claim 3, is characterized in that, the normal carbon steel scrap added should carry out Shot Blasting in advance, guarantee the surface without oily, rustless, without other impurity.
5. a kind of inoculation method that improves gray iron tensile strength according to claim 4, is characterized in that, the normal carbon steel scrap added should be toasted, and removes surface-moisture.
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| CN201310372766.8A CN103484591B (en) | 2013-08-26 | 2013-08-26 | A kind of inoculation method improving gray iron tensile strength |
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| CN201310372766.8A CN103484591B (en) | 2013-08-26 | 2013-08-26 | A kind of inoculation method improving gray iron tensile strength |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104694812A (en) * | 2015-02-15 | 2015-06-10 | 日月重工股份有限公司 | In-mold inoculation insert for thick-transect nodular iron castings and preparation method thereof |
| CN109207666A (en) * | 2018-10-22 | 2019-01-15 | 安徽大天铸业有限责任公司 | One kind being suitable for high trade mark gray iron piece formula of modifying agent and processing method |
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| CN1072215A (en) * | 1991-11-09 | 1993-05-19 | 肖至刚 | Dotted graphite cast iron and method for producing same |
| CN1087952A (en) * | 1993-12-02 | 1994-06-15 | 吴君旺 | Directly pouring casting technique using melted waste iron filings |
| CN101289725A (en) * | 2008-06-03 | 2008-10-22 | 襄汾县恒泰制动器有限公司 | Process for producing gray cast iron with high carbon equivalent, low alloy and middle-high strength |
| CN101319290A (en) * | 2008-06-12 | 2008-12-10 | 杨永刚 | Gray cast iron nucleating agent, method for producing product and application of the gray cast iron nucleating agent for smelting cast iron |
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2013
- 2013-08-26 CN CN201310372766.8A patent/CN103484591B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1072215A (en) * | 1991-11-09 | 1993-05-19 | 肖至刚 | Dotted graphite cast iron and method for producing same |
| CN1087952A (en) * | 1993-12-02 | 1994-06-15 | 吴君旺 | Directly pouring casting technique using melted waste iron filings |
| CN101289725A (en) * | 2008-06-03 | 2008-10-22 | 襄汾县恒泰制动器有限公司 | Process for producing gray cast iron with high carbon equivalent, low alloy and middle-high strength |
| CN101319290A (en) * | 2008-06-12 | 2008-12-10 | 杨永刚 | Gray cast iron nucleating agent, method for producing product and application of the gray cast iron nucleating agent for smelting cast iron |
Non-Patent Citations (1)
| Title |
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| 王晓江等: "《铸造合金及其熔炼》", 31 October 1999, 机械工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104694812A (en) * | 2015-02-15 | 2015-06-10 | 日月重工股份有限公司 | In-mold inoculation insert for thick-transect nodular iron castings and preparation method thereof |
| CN104694812B (en) * | 2015-02-15 | 2017-05-10 | 日月重工股份有限公司 | In-mold inoculation insert for thick-transect nodular iron castings and preparation method thereof |
| CN109207666A (en) * | 2018-10-22 | 2019-01-15 | 安徽大天铸业有限责任公司 | One kind being suitable for high trade mark gray iron piece formula of modifying agent and processing method |
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| CN103484591B (en) | 2016-12-28 |
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