CN105950814A - Production method for high-strength high-elongation spheroidal graphite cast iron - Google Patents
Production method for high-strength high-elongation spheroidal graphite cast iron Download PDFInfo
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- CN105950814A CN105950814A CN201610525235.1A CN201610525235A CN105950814A CN 105950814 A CN105950814 A CN 105950814A CN 201610525235 A CN201610525235 A CN 201610525235A CN 105950814 A CN105950814 A CN 105950814A
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- iron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to the technical field of iron casting processes, in particular to a production method for high-strength high-elongation spheroidal graphite cast iron. The production method comprises the steps that S1, furnace materials are selected and comprise the main material and the auxiliary material, the main material is prepared by mass fraction and comprises 40%-60% of scrap steel and the balance pig iron, and the auxiliary material comprises silicon iron, ferromanganese and a recarburizer; S2, the furnace materials are put into an electric furnace to be melted into molten iron; S3, tapping is conducted, the interrupted front treatment is conducted on the molten iron, and alloy is added into the molten iron according to the component of the molten iron, so that the content of silicon in the processed molten iron is 3.0%-3.5%; and S4, the processed molten iron is subjected to spheroidizing treatment and inoculation treatment, specifically, a spheroidizing agent and an inoculant are packed to be in a coil form through sheet steel and added into the molten iron to be subjected to spheroidizing treatment and inoculation treatment through wire feeding equipment at a certain speed, so that the high-strength high-elongation spheroidal graphite cast iron is obtained. According to the production method for the high-strength high-elongation spheroidal graphite cast iron, the addition quantity of the chemical elements can be precisely controlled, the influence of human factors on the production method is small, and the advantages of safety, environmental protection and mass production are achieved.
Description
Technical field
The present invention relates to casting iron craft technical field, particularly relate to a kind of high-strength high-elongation ratio ball
The production method of ink cast iron.
Background technology
In current ductile iron production, produce the typical case of the spheroidal graphite cast-iron of high intensity, high-elongation
Process is to pour method, be also called sandwich methods, refers to nodulizer is embedded in the bag end, table
Layer covers ferrosilicon or other kinds of coverture, and after tapping a blast furnace, molten iron reacts with nodulizer,
Molten iron is carried out the process of spheroidising.
The method that pours produces spheroidal graphite cast-iron mainly some shortcoming following: (1) undulatory property is relatively big, is subject to
Anthropic factor affects；(2) there is the pollution of light and flue dust；(3) Oxygen potential absorbance is relatively low；(4)
Tapping a blast furnace after charging, treatment effect is affected by the weight fluctuation that taps a blast furnace, it is difficult to produce high intensity high
The spheroidal graphite cast-iron of elongation percentage.
Summary of the invention
(1) to solve the technical problem that
The technical problem to be solved in the present invention is to solve existing method to be difficult to produce high intensity Gao Yan
The problem stretching the spheroidal graphite cast-iron of rate.
(2) technical scheme
In order to solve above-mentioned technical problem, the invention provides a kind of high-strength high-elongation ratio spheroidal graphite
The production method of cast iron, including step S1, the selection of furnace charge, described furnace charge includes major ingredient and auxiliary
Expecting, mass fraction proportioning pressed by described major ingredient, and in wherein said major ingredient, the content of steel scrap is
40%～60%, remaining is the pig iron；Described adjuvant includes ferrosilicon, ferromanganese and carburant；S2, will
Furnace charge is molten into molten iron in putting into electric furnace；S3, taps a blast furnace and molten iron is carried out stokehold process, according to
The composition of molten iron adds alloy in molten iron, and the content making the silicon in the molten iron after process is
3.0%～3.5%；S4, carries out nodularization, inoculation to the molten iron after processing, by nodulizer and pregnant
Educate agent and be bundled into coil form by sheetmetal, by specific wire-feeding device comprising straightening wire-leading device with certain speed by ball
Agent and inovulant carry out nodularization and inoculation in joining molten iron uniformly, obtain high intensity
The spheroidal graphite cast-iron of high-elongation.
Wherein, described step S2 also includes step S21, and furnace charge is molten in electric furnace molten iron
After be again heated to 1500 DEG C, and carry out chemical examination of skimming；S22, adjusts molten iron according to result of laboratory test
Composition, and stand 8 minutes to 12 minutes after being heated to 1520 DEG C, make tapping temperature control
1480 DEG C to 1500 DEG C.
Wherein, the composition of each element in the molten iron after described step S22 processes is with quality
Percentages is: the content of C is 3.2%～3.4%, and the content of Si is 2.0%～2.5%, Mn's
Content is 0～0.3%, and the content of S is 0～0.02%, and the content of P is 0～0.03%, and remaining is ferrum.
Wherein, described step S3 is additionally included in when tapping a blast furnace to enter with stream addition 75 ferrosilicon in molten iron
Row tentatively breeds, and the content of Si is brought up to 3.0%～3.5%.
Wherein, in described step S4, when the molten iron after processing is carried out nodularization, inoculation,
Keep the temperature of molten iron between 1450 DEG C to 1470 DEG C.
Wherein, in described step S4, using wire-feeding device comprising straightening wire-leading device, molten iron is carried out nodularization, womb
During reason, first add nodulizer, add inovulant after 30 seconds to 50 seconds, complete nodularization, inoculation
After, stop adding nodulizer and inovulant simultaneously.
Wherein, in described step S4, in the spheroidal graphite cast-iron of high-strength high-elongation ratio, each element contains
Amount is to be by mass percentage: the content of C is 3.0%～3.3%, and the content of Si is
The content of 4.0%～4.5%, Mn is 0～0.3%, and the content of S is not more than 0.02%, the content of P
Being not more than 0.04%, the content of Mg is 0.03%～0.05%, and the content of Re is 0.02%～0.04%,
Remaining is ferrum.
(3) beneficial effect
The technique scheme of the present invention has the advantage that a kind of high intensity that the present invention provides
The production method of the spheroidal graphite cast-iron of high-elongation, including by steel scrap, the pig iron, ferrosilicon, ferromanganese and
It is molten iron that carburant puts into thawing in electric furnace, then taps a blast furnace and molten iron is carried out stokehold process, root
Adding alloy in molten iron according to the composition of molten iron, the content making the silicon in the molten iron after process is
3.0%～3.5%, finally the molten iron after processing is carried out nodularization and inoculation, by nodulizer and pregnant
Educate agent and be bundled into coil form by sheetmetal, by wire-feeding device comprising straightening wire-leading device with certain speed by nodulizer and
Inovulant joins uniformly and carries out nodularization and inoculation in molten iron, i.e. can get high intensity high
The spheroidal graphite cast-iron of elongation percentage, uses injection feeding technology that molten iron is carried out spheroidising, it is possible to control accurately
The addition of chemical element processed, less by anthropic factor, have safety and environmental protection and can batch metaplasia
The advantage produced.
The skill of the technical scheme except described above present invention solves the technical problem that, constituting
Art feature and have outside the advantage that the technical characteristic of these technical schemes is brought, the present invention's
The advantage that other technologies feature and these technical characteristics bring, will make furtherly in conjunction with accompanying drawing
Bright.
Accompanying drawing explanation
Fig. 1 is the production method of the high-strength high-elongation ratio spheroidal graphite cast-iron that the embodiment of the present invention provides.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below will knot
Close the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear,
It is fully described by, it is clear that described embodiment is a part of embodiment of the present invention, and not
It it is whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
There is on the premise of making creative work the every other embodiment obtained, broadly fall into the present invention
The scope of protection.
In describing the invention, it should be noted that unless otherwise clearly defined and limited,
Term " is installed ", " being connected ", " connection " should be interpreted broadly, for example, it may be fixing even
Connect, it is also possible to be to removably connect, or be integrally connected；Can be to be mechanically connected, it is also possible to
It it is electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, can concrete feelings
Condition understands above-mentioned term concrete meaning in the present invention.
Additionally, in describing the invention, except as otherwise noted, " multiple ", " many ", " many
Group " it is meant that two or more, " several ", " some ", the containing of " some groups "
Justice is one or more.
As it is shown in figure 1, a kind of high-strength high-elongation ratio spheroidal graphite cast-iron that the embodiment of the present invention provides
Production method, including step S1, the selection of furnace charge, furnace charge requires must be pure, selects excellent
The ball pig iron of matter, and the impurity such as manganese in furnace charge, phosphorus, sulfur, titanium must control at floor level,
Furnace charge includes major ingredient and adjuvant, and major ingredient presses mass fraction proportioning, the wherein content of steel scrap in major ingredient
Being 40%～60%, remaining is the pig iron, and what steel scrap selected is that micronutrient levels is relatively low, composition
The packing steel scrap that concordance is strong；Adjuvant includes ferrosilicon, ferromanganese and carburant, and carburant is through too high
Temperature graphitization and fixed carbon content reach more than 99%, and the interpolation of carburant makes the trace in furnace charge
Control of element is at floor level；S2, puts into furnace charge 12T medium-frequency induction furnace and is molten into ferrum
Water, wants rapid melting in fusion process, reduces the tendency of molten iron oxidation.S3, taps a blast furnace and right
Molten iron carries out stokehold process, adds alloy, after making process according to the composition of molten iron in molten iron
The content of the silicon in molten iron is 3.0%～3.5%.S4, carries out nodularization, pregnant to the molten iron after processing
Educate process, nodulizer and inovulant are bundled into coil form by sheetmetal, by specific line feeding
Equipment carry out in nodulizer and inovulant being joined molten iron uniformly with certain speed nodularization and
Inoculation, obtains the spheroidal graphite cast-iron of high-strength high-elongation ratio.
Further, step S2 also includes step S21, by load melting for reheating after molten iron
To 1500 DEG C, and carry out chemical examination of skimming；S22, adjusts the composition of molten iron according to result of laboratory test, and
Quiescence in high temperature 8 minutes to 12 minutes after being heated to 1520 DEG C, make tapping temperature control at 1480 DEG C
To 1500 DEG C.
Further, the composition of each element in the molten iron after step S12 processes is with quality
Percentages is: the content of C is 3.2%～3.4%, and the content of Si is 2.0%～2.5%, Mn's
Content is 0～0.3%, and the content of S is 0～0.02%, and the content of P is 0～0.03%, and remaining is ferrum.
Further, step S3 is additionally included in when tapping a blast furnace to enter with stream addition 75 ferrosilicon in molten iron
Row tentatively breeds, and the content of silicon is brought up to 3.0%～3.5%.
Further, in step S4, when the molten iron after processing is carried out nodularization, inoculation,
Keep the temperature of molten iron between 1450 DEG C to 1470 DEG C.
Further, in step S4, using wire-feeding device comprising straightening wire-leading device, molten iron is carried out nodularization, womb
During reason, first add nodulizer, add inovulant after 30 seconds to 50 seconds, complete nodularization, inoculation
After, stop adding nodulizer and inovulant simultaneously.
Further, in step S4, in the spheroidal graphite cast-iron of high-strength high-elongation ratio, each element contains
Amount is to be by mass percentage: the content of C is 3.0%～3.3%, and the content of Si is
The content of 4.0%～4.5%, Mn is 0～0.3%, and the content of S is not more than 0.02%, the content of P
Being not more than 0.04%, the content of Mg is 0.03%～0.05%, and the content of Re is 0.02%～0.04%,
Remaining is ferrum.
The method of the spheroidal graphite cast-iron producing high-strength high-elongation ratio in employing the present embodiment is the most sharp
The accuracy controlled with injection feeding technology and silicon strengthening, for the improvement of Alloy Affecting Ductile Properties, are developed
Can the new technology of steady production high-strength high-elongation ratio spheroidal graphite cast-iron, its major advantage has following
Some:
(1) using injection feeding technology that molten iron carries out spheroidising, nodularization constituent content can accomplish essence
Really control, be affected by human factors little, and use wire-feeding device comprising straightening wire-leading device to carry out nodularization and inoculation,
Environmental friendliness, smoke dust etc. pollutes.
(2) through breeding for twice, to ensure that foundry goods forms the tendency of carbide little, and stokehold uses 75
Ferrosilicon, can play the effect increasing silicon, and can play the effect tentatively bred.At nodularization
While reason, add covering line and carry out inoculation, finally ensure pregnant effect.
(3) on the basis of ensureing nodularization, foundry goods final silicon content controls 4.0%～4.5%, logical
Cross the invigoration effect of silicon, produce the spheroidal graphite cast-iron of high-strength high-elongation ratio, and use after testing
The tensile strength of the spheroidal graphite cast-iron that the method is poured reaches more than 600MPa, simultaneously elongation percentage
More than 12% can be reached.
In sum, the method for the high-strength high-elongation ratio that the embodiment of the present invention provides mainly profit
The addition of nodulizer it is accurately controlled, it is possible to by spheroidization material with advanced cored wire injection nodulizing device
Being uniformly delivered to inside molten iron, improve nodularization effect, nodulizer absorbance improves simultaneously, energy
Enough nodulizer and molten iron intense reaction are controlled at bottom line, and then make nodularization process steady,
The present invention uses injection feeding technology to substitute and traditional pours method, improves the utilization rate of various material, and material
Material fully absorbs the raising of the quality contributing to molten iron.Use silicon that spheroidal graphite cast-iron has been carried out solid solution
Strengthening, in the case of low cost, it is ensured that taken into account prolonging of material while foundry goods tensile strength
Stretch rate.
Last it is noted that above example is only in order to illustrate technical scheme, and
Non-to its restriction；Although the present invention being described in detail with reference to previous embodiment, ability
The those of ordinary skill in territory is it is understood that it still can be to the skill described in foregoing embodiments
Art scheme is modified, or wherein portion of techniques feature is carried out equivalent；And these are repaiied
Change or replace, not making the essence of appropriate technical solution depart from various embodiments of the present invention technical side
The spirit and scope of case.
Claims (7)
1. the production method of a high-strength high-elongation ratio spheroidal graphite cast-iron, it is characterised in that: include
Step
S1, the selection of furnace charge, described furnace charge includes that major ingredient and adjuvant, described major ingredient are divided by quality
Number proportioning, in wherein said major ingredient, the content of steel scrap is 40%～60%, and remaining is the pig iron；Described
Adjuvant includes ferrosilicon, ferromanganese and carburant；
S2, is molten into molten iron in furnace charge puts into electric furnace；
S3, taps a blast furnace and molten iron is carried out stokehold process, adds in molten iron according to the composition of molten iron
Alloy, the content making the silicon in the molten iron after process is 3.0%～3.5%；
S4, carries out nodularization, inoculation to the molten iron after processing, nodulizer and inovulant is led to
Cross sheetmetal and be bundled into coil form, by specific wire-feeding device comprising straightening wire-leading device with certain speed by nodulizer and
Inovulant carries out nodularization and inoculation in joining molten iron uniformly, obtains high intensity height and extends
The spheroidal graphite cast-iron of rate.
The production method of high-strength high-elongation ratio spheroidal graphite cast-iron the most according to claim 1,
It is characterized in that: described step S2 also includes step
S21, is again heated to 1500 DEG C, and skims after furnace charge is molten in electric furnace molten iron
Chemical examination；
S22, adjusts the composition of molten iron, and stands 8 after being heated to 1520 DEG C according to result of laboratory test
Minute to 12 minutes, tapping temperature is made to control at 1480 DEG C to 1500 DEG C.
The production method of high-strength high-elongation ratio spheroidal graphite cast-iron the most according to claim 1,
It is characterized in that: the composition of each element in molten iron after described step S22 processes is with matter
Amount percentages is: the content of C is 3.2%～3.4%, and the content of Si is 2.0%～2.5%, Mn
Content be 0～0.3%, the content of S is 0～0.02%, and the content of P is 0～0.03%, and remaining is
Ferrum.
The production method of high-strength high-elongation ratio spheroidal graphite cast-iron the most according to claim 3,
It is characterized in that: described step S3 is additionally included in when tapping a blast furnace and adds 75 ferrosilicon with stream in molten iron
Tentatively breed, the content of Si is brought up to 3.0%～3.5%.
The production method of high-strength high-elongation ratio spheroidal graphite cast-iron the most according to claim 1,
It is characterized in that: in described step S4, the molten iron after processing is being carried out nodularization, inoculation
Time, keep the temperature of molten iron between 1450 DEG C to 1470 DEG C.
The production method of high-strength high-elongation ratio spheroidal graphite cast-iron the most according to claim 1,
It is characterized in that: in described step S4, molten iron is carried out nodularization using wire-feeding device comprising straightening wire-leading device, breeds
During process, first add nodulizer, add inovulant after 30 seconds to 50 seconds, complete nodularization, womb
After reason, stop adding nodulizer and inovulant simultaneously.
7. according to the life of the high-strength high-elongation ratio spheroidal graphite cast-iron described in any one of claim 1-6
Product method, it is characterised in that: in described step S4, in the spheroidal graphite cast-iron of high-strength high-elongation ratio
The content of each element is to be by mass percentage: the content of C is 3.0%～3.3%, and Si contains
Amount is 4.0%～4.5%, and the content of Mn is 0～0.3%, and the content of S is not more than 0.02%, P's
Content is not more than 0.04%, and the content of Mg is 0.03%～0.05%, and the content of Re is
0.02%～0.04%, remaining is ferrum.
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Cited By (5)
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| CN106636523A (en) * | 2016-09-27 | 2017-05-10 | 宝鸡市晨瑞鑫铸造有限责任公司 | Method for preparing nodular cast iron through full scrap steel |
| CN106868395A (en) * | 2016-12-20 | 2017-06-20 | 广西玉柴机器配件制造有限公司 | A kind of production method of mixed matrix tissue cast condition ductile iron |
| CN107829020A (en) * | 2017-11-30 | 2018-03-23 | 喀左鹏达铸造有限公司 | With the method for low manganese waste steel ingredient production spheroidal graphite cast-iron |
| CN109972025A (en) * | 2019-03-29 | 2019-07-05 | 山西中设华晋铸造有限公司 | A kind of spheroidal graphite cast-iron preparation method |
| CN114231831A (en) * | 2021-12-30 | 2022-03-25 | 第一拖拉机股份有限公司 | High-strength and high-toughness nodular cast iron and preparation method thereof |
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| CN107829020A (en) * | 2017-11-30 | 2018-03-23 | 喀左鹏达铸造有限公司 | With the method for low manganese waste steel ingredient production spheroidal graphite cast-iron |
| CN109972025A (en) * | 2019-03-29 | 2019-07-05 | 山西中设华晋铸造有限公司 | A kind of spheroidal graphite cast-iron preparation method |
| CN114231831A (en) * | 2021-12-30 | 2022-03-25 | 第一拖拉机股份有限公司 | High-strength and high-toughness nodular cast iron and preparation method thereof |
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