CN106467949A - A kind of mine blocking plate and its processing technique - Google Patents
A kind of mine blocking plate and its processing technique Download PDFInfo
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- CN106467949A CN106467949A CN201610784567.1A CN201610784567A CN106467949A CN 106467949 A CN106467949 A CN 106467949A CN 201610784567 A CN201610784567 A CN 201610784567A CN 106467949 A CN106467949 A CN 106467949A
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- blocking plate
- iron
- mine blocking
- processing technique
- mine
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- 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
-
- 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
- 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
-
- 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
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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
A kind of mine blocking plate and its processing technique, the percentage by weight of the chemical composition of described mine blocking plate is：3.10%≤C≤3.90%, 2.00%≤Si≤3.40%, 0.20%≤Mn≤0.90%, 0.2%≤Mo≤0.4%, 0%≤Cu≤0.6%, 0%≤Ni≤0.6%, balance of ferrum, it is good that the present invention has an impact resistance, resistant to elevated temperatures advantage.
Description
Technical field
Patent of the present invention is related to field of metallurgy, particularly to a kind of mine blocking plate and its processing technique.
Background technology
Spheroidal graphite cast-iron is to obtain globular graphite by nodularization and inoculation, is effectively improved the mechanical performance of cast iron,
In particular improving plasticity and toughness, thus obtaining the intensity also higher than carbon steel, being based on its excellent performance, successfully
For casting, some stress are complicated, and intensity, toughness, wearability require higher part.Produced with spheroidal graphite cast-iron foundry engieering
Product there is high intensity, high tenacity and low price, be widely used in various fields.Spheroidal graphite cast-iron has high intensity
Plasticity and toughness, it at home and abroad develops very soon, and yield alreadys exceed cast steel and malleable cast iron, becomes the casting being only second to casting pig
Alloy material.
Mine blocking plate installs and uses that condition is more severe, bears high temperature, chassis runs upset and has larger impulsive force, existing
Life of product is short, and impact resistance is poor.
Content of the invention
The technical problem to be solved and the technical assignment proposing are that prior art is improved, and the present invention carries
The economical good advantage of processing method providing for a kind of mine blocking plate and its processing technique, the present invention, by this processing side
It is good that the mine blocking plate that method obtains has an impact resistance, resistant to elevated temperatures advantage.
For solving above technical problem, the technical scheme is that a kind of mine blocking plate, the chemical composition of described mine blocking plate
Percentage by weight include：3.10%≤C≤3.90%, 2.00%≤Si≤3.40%, 0.20%≤Mn≤0.90%,
0.2%≤Mo≤0.4%, 0%≤Cu≤0.6%, 0%≤Ni≤0.6%, balance of ferrum.
Preferably, the chemical composition of described mine blocking plate includes by weight percentage：The chemical composition of described mine blocking plate presses weight
Amount percentage ratio includes：3.6%≤C≤3.8%, 2.5%≤Si≤2.9%, 0%≤Mn≤0.3%, 0.3%≤Mo≤
0.4%, 0.5%≤Cu≤0.6%, 0.4%≤Ni≤0.6%, balance of ferrum.
Preferably, the chemical composition of described mine blocking plate includes by weight percentage：C=3.8%, Si=2.8%, Mn=
0.3%, Mo=0.4%, Cu=0.6%, Ni=0.6%, balance of ferrum.
A kind of processing technique of mine blocking plate is it is characterised in that a kind of processing technique of described mine blocking plate is：
1) by the pig iron, steel scrap, useless spheroidal graphite cast-iron, molybdenum-iron, ferrosilicon and rare earth alloy mixing, obtain mixture；
2) described mixture is put into 500Kg middle frequency furnace and carry out melting, the molten iron that melting obtains turns after melting down removing slag
Move to ladle；
3) nodularization is carried out to molten iron using pouring method；
4) molten iron after described nodularization is poured into a mould, obtained prefabricated component；
5) heat treatment is carried out to described prefabricated component, obtain a kind of mine blocking plate, the chemical composition by weight hundred of described mine blocking plate
Divide than inclusion：C=3.8%, Si=2.8%, Mn=0.3%, Mo=0.4%, Cu=0.6%, Ni=0.6%, balance of ferrum.
Preferably, the pig iron, steel scrap, useless spheroidal graphite cast-iron, the weight of molybdenum-iron, ferrosilicon and rare earth alloy in described raw material melting step
Measuring ratio is：6.25∶1.6∶2∶(0.013-0.015)∶(0.02-0.04)∶(0.015-0.02).
Preferably, described nodulizer and the mass ratio of molten iron are 1.5:100, nodulizer granule size is 5-10mm.
Preferably, described spheroidizing process is：Nodulizer after drying and preheating is added ladle bottom, nodulizer covers
1.5-2.5kg ferrosilicon, then it is compacted into and presses the thick steel plate of 6mm after covering iron filings, molten iron is another from ladle bottom
Side adds, and carries out spheroidising to described molten iron.
Preferably, the tapping temperature of described molten iron is 1520 DEG C -1580 DEG C, and pouring temperature is 1410 DEG C -1460 DEG C, and from
Molten iron is come out of the stove, is carried out spheroidizing process, is poured, and is less than or equal to 4 points 30 seconds when shared.
Preferably, described Technology for Heating Processing is：
1) described prefabricated component is warming up to 800-850 DEG C；
2) described prefabricated component is incubated 2-3 hour；
3) described prefabricated component stove is cooled to room temperature.
The present invention provides a kind of mine blocking plate and its processing technique, and the processing method that the present invention provides is economical good excellent
Point, has an impact resistance by the mine blocking plate that this processing method obtains good, resistant to elevated temperatures advantage.
Specific embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, all
Belong to the scope of protection of the invention.
Carbon：In cast iron, C content, below 2.0 mass %, easily generates carbide, more than 4.0 mass %, causes stone
Ink separates out, and affects spheroidizing quality, reduces intensity and the toughness of cast iron.Therefore, 3.10%≤C≤3.90%.
Silicon：Si has the promotion graphitization of carbon and the ferritizing effect of matrix, when Si content is larger, spheroidal graphite cast-iron
Toughness reduce, therefore the upper limit be 4.0 mass %.In order to improve oxidative resistance, therefore 2.00%≤Si≤3.40% further.
Manganese：Mn is to be that S is fixed in the form of MnS and makes it innoxious required by the inevitable impurity of material
Element.But, the pearlitic structrure due to being matrix forms element, therefore 0.20%≤Mn≤0.90%.
Molybdenum：Mo is the element by being admittedly fused to the tensile strength and yield stress to improve in matrix under high temperature, when Mo contains
When quantitative change is many, Mo and C is combined into raw carbide, and hardness rises and ductility reduces.Therefore, 0.2%≤Mo≤0.4%.
Copper：When ductile cast iron casting size is larger, carbon content is relatively low, pouring temperature is relatively low, leads to metallographic structure graphite nodule
Change bad, number of graphite ball is few or the problems such as Graphite Precipitation, copper can improve central tissue and graphite form, promotes the shape of pearlite
Become, be conducive to obtaining uniform tissue, improve the mechanical property of ductile cast iron casting, when the content of copper is larger, to graphite cast iron
Annealing unfavorable, and ductility can be reduced therefore, 0%≤Cu≤0.6%.
Nickel：Be conducive to improving the matrix of graphite cast iron, improve hardness and intensity, because nickel is relatively costly, therefore 0%≤
Ni≤0.6%.
The processing technique of described metal is：
1) weigh raw material：Described raw material includes the pig iron, steel scrap, and useless spheroidal graphite cast-iron, molybdenum-iron, ferrosilicon and rare earth alloy are described
Raw material weight ratio is：6.25∶1.6∶2∶(0.013-0.015)∶(0.02-0.04)∶(0.015-0.02).；
2) melting：Described melting carries out melting using 500Kg middle frequency furnace；
3) nodularization：Described spheroidizing process is：
A) nodulizer is dried；
B) nodulizer preheating；
C) nodulizer is thrown in；
4) stokehold is processed：Including Alloying Treatment, chemical composition detects；
5) pour into a mould, molten iron tapping temperature is 1520 DEG C -1580 DEG C, pouring temperature is 1410 DEG C -1460 DEG C.；
6) heat treatment, described Technology for Heating Processing is：
A) described prefabricated component is warming up to 800-850 DEG C；
B) described prefabricated component is incubated 2-3 hour；
C) described prefabricated component stove is cooled to room temperature.
A kind of spheroidal graphite cast-iron disclosed in this invention and its processing technique are it is adaptable to reuse the waste and old pig iron in steel mill
With waste and old spheroidal graphite cast-iron, for ensure gained spheroidal graphite cast-iron chemical composition meet actually used in the case of mine blocking plate foundry goods power
Learn performance, its processing technique also should be made defined below：
For the spheroidizing quality of molten iron after melting down for the guarantee, in spheroidizing process, nodulizer granule size should be 3-8mm；
Chemical composition and mechanical property for ensureing the spheroidal graphite cast-iron obtaining meets actual demand, tackles molten iron before cast
Carry out stokehold detection, its technique is：
After liquid iron balling is processed, sample examination, detects chemical composition, pours into a mould chill block, observe the spoken parts in traditional operas that fracture presents
Degree, tentatively judges spheroidization.After spheroidising, stirring, ladle-to-ladle when, iron liquid surface scurry out flare be magnesium effusion burning
Phenomenon.Flare is the more longer strong, and nodularization better, judges as follows：
1) observe flare：
A) big flare length is more than 40mm, more than 3；Strong more than little flare, spheroidization is good；
B) big flare 1-2, accompany more than 10, little flare, spheroidization is slightly good；
C) little flare is less than 15mm, powerless less, spheroidization general (decline is fast)；
D) invisible flare, non-nodularization；
2) observe iron liquid skin covering of the surface：
A) iron liquid surface is tranquil, covers one layer of oxidation elephant skin, temperature drop, outer skin is colourful.Central part in ladle
Position molten iron surface raises up, and surrounding is sunk, and shows that liquid iron balling is good；
B) molten iron surface portion is raised, or raised position is uneven, shows half nodularization；
C) surface is seethed seriously, and oxide skin is few, and concentrates on central authorities, shows non-nodularization.
3) chill block：
A) test block section width 25mm × high 50mm, is cooled to dark red (600-700 DEG C), takes out hardening, the good feature of nodularization：
Fracture silvery white, crystal grain is thin, the obvious shrinkage porosite in center, three side punctures, hangs and has hit steel sound, and immersion has carbide taste.
4) cylinder coupon：
Diameter is generally the thickest 0.8 times of foundry goods, long 300mm.Judge similar to test wedge：Fracture silvery white, crystal grain
Fine and closely woven, there is shrinkage porosite at center, then nodularization is good.
5) quick metallographic specimen：
Sample φ 20 × 20 or φ 30 × 30, observes end and is reduced into φ 10-15；Polish after polishing by standard rating.
Prefabricated component for ensureing cast meets needs of production, it is to avoid pore, shrinkage cavity, crackle, slag inclusion etc. in foundry goods
Casting flaw, pouring technology is：
Make white mould, white die topography is repaired, the Cast Iron Surface of Yin Baimo cast is also easy to produce defect, therefore white mould surface should be protected
Stay the allowance more than or equal to 5mm.
Dialogue die coating swabbing before cast, carries out dialogue mould and carries out second spraying, paint thickness control after coating drying
System is in 2-3mm.
Prefabricated component for ensureing each cast meets needs of production, with case cast tensile strength examination in injection molded process
Rod, and chemical composition is carried out to coupon and mechanical property tests and analyzes.
For eliminating the internal stress of nodularization cast iron prefabricated component, improve metal structure to obtain more preferable mechanical property, heat treatment
Technique is：
A) described prefabricated component is warming up to 800-850 DEG C；
B) described prefabricated component is incubated 2-3 hour；
C) described prefabricated component stove is cooled to room temperature.
The coupon performance evaluation of table 1 embodiment 1
Embodiment 2-6
By a kind of processing method of above-mentioned mine blocking plate, prepare the embodiment of chemical composition different quality percentage ratio
2-6, the mine blocking plate chemical composition that each embodiment obtains and coupon performance are as shown in the table：
The chemical composition of table 2 embodiment 2-6 and corresponding coupon performance evaluation
Foundry goods graphite is most of in bulk and spherical, remaining for rolling into a ball cotton-shaped, Oxygen potential 85-90%, reach nodularization three-level or three
More than level；Matrix pearlite fraction >=85%.
The spheroidal graphite cast-iron of the present invention has higher elevated temperature strength and good ductility.Consequently, it is possible to more than 800 DEG C
Temperature province use, and rare earth element demand is low, has the advantages that good in economic efficiency.
In above-mentioned spheroidal graphite cast-iron, the Oxygen potential of preferably graphite is more than 85%.By making the Oxygen potential of graphite be 80%,
The tensile strength under high temperature and yield stress can be improved.The high temperature strength of the mine blocking plate being manufactured using above-mentioned spheroidal graphite cast-iron
And excellent impact resistance.According to the present invention, by forming above-mentioned composition, elevated temperature strength and resistance to impact can be manufactured with low cost
Spheroidal graphite cast-iron excellent and that there is excellent ductility.
The present invention provides a kind of mine blocking plate and its processing technique, and the processing method that the present invention provides is economical good excellent
Point, has an impact resistance by the mine blocking plate that this processing method obtains good, resistant to elevated temperatures advantage.
The above is only the preferred embodiment of the present invention it is noted that above-mentioned preferred implementation be not construed as right
The restriction of the present invention, protection scope of the present invention should be defined by claim limited range.For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these change
Enter and retouch also to should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of mine blocking plate is it is characterised in that the percentage by weight of the chemical composition of described mine blocking plate includes：3.10%≤C≤
3.90%, 2.00%≤Si≤3.40%, 0.20%≤Mn≤0.90%, 0.2%≤Mo≤0.4%, 0%≤Cu≤0.6%,
0%≤Ni≤0.6%, balance of ferrum.
2. a kind of mine blocking plate according to claim 1 is it is characterised in that the chemical composition percentage by weight of described mine blocking plate
Than inclusion：3.6%≤C≤3.8%, 2.5%≤Si≤2.9%, 0%≤Mn≤0.3%, 0.3%≤Mo≤0.4%, 0.5%
≤ Cu≤0.6%, 0.4%≤Ni≤0.6%, balance of ferrum.
3. a kind of mine blocking plate according to claim 2 is it is characterised in that the chemical composition percentage by weight of described mine blocking plate
Than inclusion：C=3.8%, Si=2.8%, Mn=0.3%, Mo=0.4%, Cu=0.6%, Ni=0.6%, balance of ferrum.
4. a kind of processing technique of mine blocking plate is it is characterised in that a kind of processing technique of described mine blocking plate is：
1) by the pig iron, steel scrap, useless spheroidal graphite cast-iron, molybdenum-iron, ferrosilicon and rare earth alloy mixing, obtain mixture；
2) described mixture is put into 500Kg middle frequency furnace and carry out melting, the molten iron that melting obtains is transferred to after melting down removing slag
Ladle；
3) nodularization is carried out to molten iron using pouring method；
4) molten iron after described nodularization is poured into a mould, obtained prefabricated component；
5) heat treatment is carried out to described prefabricated component, obtain a kind of mine blocking plate, the chemical composition of described mine blocking plate is by weight percentage
Including：C=3.8%, Si=2.8%, Mn=0.3%, Mo=0.4%, Cu=0.6%, Ni=0.6%, balance of ferrum.
5. a kind of processing technique of mine blocking plate according to claim 4 is it is characterised in that give birth in described raw material melting step
Ferrum, steel scrap, useless spheroidal graphite cast-iron, the weight ratio of molybdenum-iron, ferrosilicon and rare earth alloy are：6.25∶1.6∶2∶(0.013-0.015)∶
(0.02-0.04)∶(0.015-0.02).
6. a kind of processing technique of mine blocking plate according to claim 4 is it is characterised in that the matter of described nodulizer and molten iron
Amount ratio is 1.5:100, nodulizer granule size is 5-10mm.
7. a kind of processing technique of mine blocking plate according to claim 4 is it is characterised in that described spheroidizing process is：To do
Nodulizer after dry preheating adds ladle bottom, and nodulizer covers 1.5-2.5kg ferrosilicon, then is compacted into simultaneously after covering iron filings
The thick steel plate of 6mm in pressure, the opposite side from ladle bottom for the molten iron is added, carries out spheroidising to described molten iron.
8. a kind of processing technique of mine blocking plate according to claim 4 is it is characterised in that the tapping temperature of described molten iron is
1520 DEG C -1580 DEG C, pouring temperature is 1410 DEG C -1460 DEG C, and comes out of the stove from molten iron, carry out spheroidizing process, be poured, and shares
When less than or equal to 4 points 30 seconds.
9. a kind of processing technique of mine blocking plate according to claim 4 is it is characterised in that described Technology for Heating Processing is：
1) described prefabricated component is warming up to 800-850 DEG C；
2) described prefabricated component is incubated 2-3 hour；
3) described prefabricated component stove is cooled to room temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110066959A (en) * | 2019-06-05 | 2019-07-30 | 湖南佳海电梯设备制造有限公司 | A kind of high manganese Inoculation Gray Cast Iron material of high intensity low-sulfur and its melting casting craft |
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| CN104789853A (en) * | 2014-04-22 | 2015-07-22 | 天津虹冈铸钢有限公司 | Novel die cast ductile iron and fusion casting method thereof |
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| JP2004011022A (en) * | 2002-06-12 | 2004-01-15 | Aomori Prefecture | Spherical graphite cast-iron excellent in weathering resistance and its production method |
| CN101736190A (en) * | 2009-12-09 | 2010-06-16 | 扬州电力设备修造厂 | Alloy austenitic-bainite ductile iron worm gear and preparation process thereof |
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| CN110066959A (en) * | 2019-06-05 | 2019-07-30 | 湖南佳海电梯设备制造有限公司 | A kind of high manganese Inoculation Gray Cast Iron material of high intensity low-sulfur and its melting casting craft |
| CN110066959B (en) * | 2019-06-05 | 2021-10-12 | 湖南佳海电梯设备制造有限公司 | High-strength low-sulfur high-manganese inoculated gray cast iron material and smelting and pouring process thereof |
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