CN106467949B - A kind of mine blocking plate and its processing technology - Google Patents
A kind of mine blocking plate and its processing technology Download PDFInfo
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- CN106467949B CN106467949B CN201610784567.1A CN201610784567A CN106467949B CN 106467949 B CN106467949 B CN 106467949B CN 201610784567 A CN201610784567 A CN 201610784567A CN 106467949 B CN106467949 B CN 106467949B
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- iron
- blocking plate
- molten iron
- mine blocking
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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
Abstract
A kind of mine blocking plate and its processing technology, the weight percent of the chemical component of the mine blocking plate are as follows: 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%, surplus is iron, and the present invention has impact resistance good, advantage resistant to high temperature.
Description
Technical field
The invention patent relates to field of metallurgy, in particular to a kind of mine blocking plate and its processing technology.
Background technique
Spheroidal graphite cast-iron is to obtain globular graphite by nodularization and inoculation, effectively improves the mechanical performance of cast iron,
Plasticity and toughness are in particular improved, to obtain the intensity also higher than carbon steel, is based on its excellent performance, successfully
For casting some stress complexity, the more demanding part of intensity, toughness, wearability.It is produced with spheroidal graphite cast-iron foundry engieering
Product have many advantages, such as high-intensitive, high tenacity and low price, be widely used in various fields.Spheroidal graphite cast-iron has high-intensitive
Plasticity and toughness at home and abroad develop very fastly, and yield alreadys exceed cast steel and malleable cast iron, becomes the casting for being only second to gray cast iron
Alloy material.
It is more severe that mine blocking plate installs and uses condition, bears high temperature, trolley operation overturning has biggish impact force, existing
Life of product is short, and impact resistance is poor.
Summary of the invention
The technical problems to be solved by the invention and the technical assignment of proposition are improved to the prior art, and the present invention mentions
For a kind of mine blocking plate and its processing technology, the economical good advantage of processing method provided by the invention passes through the processing side
The mine blocking plate that method obtains has impact resistance good, advantage resistant to high temperature.
In order to solve the above technical problems, the technical scheme is that a kind of mine blocking plate, the chemical component of the mine blocking plate
Weight percent 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%, surplus are iron.
Preferably, the chemical component of the mine blocking plate includes: the chemical component of the mine blocking plate by weight by weight percentage
Amount percentage includes: 3.6%≤C≤3.8%, 2.5%≤Si≤2.9%, 0%≤Mn≤0.3%, and 0.3%≤Mo≤
0.4%, 0.5%≤Cu≤0.6%, 0.4%≤Ni≤0.6%, surplus are iron.
Preferably, the chemical component of the mine blocking plate includes: C=3.8%, Si=2.8%, Mn=by weight percentage
0.3%, Mo=0.4%, Cu=0.6%, Ni=0.6%, surplus are iron.
A kind of a kind of processing technology of mine blocking plate, which is characterized in that processing technology of mine blocking plate are as follows:
1) by the pig iron, steel scrap, give up spheroidal graphite cast-iron, molybdenum-iron, and ferrosilicon and rare earth alloy mixing obtain mixture；
2) mixture is put into 500Kg middle frequency furnace and carries out melting, the molten iron that melting obtains turns after melting down remove slag
Move to ladle；
3) use pours method and carries out nodularization to molten iron；
4) molten iron after the nodularization is poured, obtains prefabricated component；
5) prefabricated component is heat-treated, obtains a kind of mine blocking plate, the chemical component of the mine blocking plate by weight hundred
Dividing ratio includes: C=3.8%, and Si=2.8%, Mn=0.3%, Mo=0.4%, Cu=0.6%, Ni=0.6%, surplus are iron.
Preferably, the weight of the pig iron in the raw material melting step, steel scrap, useless spheroidal graphite cast-iron, molybdenum-iron, ferrosilicon and rare earth alloy
Measure ratio are as follows: 6.25: 1.6: 2: (0.013-0.015): (0.02-0.04): (0.015-0.02).
Preferably, the mass ratio of the nodulizer and molten iron is 1.5:100, and nodulizer granule size is 5-10mm.
Preferably, the spheroidizing process are as follows: ladle bottom, nodulizer covering is added in the nodulizer after drying and preheating
1.5-2.5kg ferrosilicon, then the steel plate of 6mm thickness is compacted into and pressed after covering iron filings, by molten iron from the another of ladle bottom
Side is added, and carries out spheroidising to the molten iron.
Preferably, the tapping temperature of the molten iron is 1520 DEG C -1580 DEG C, and pouring temperature is 1410 DEG C -1460 DEG C, and from
Molten iron comes out of the stove, carries out spheroidizing process, is poured, and 4 points is less than or equal to when sharing 30 seconds.
Preferably, the heat treatment process are as follows:
1) prefabricated component is warming up to 800-850 DEG C；
2) prefabricated component is kept the temperature 2-3 hours；
3) the prefabricated component furnace is cooled to room temperature.
The present invention provides a kind of mine blocking plate and its processing technology, and processing method provided by the invention is economical good excellent
Point has impact resistance good, advantage resistant to high temperature by the mine blocking plate that the processing method obtains.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
Carbon: C content is in 2.0 mass % hereinafter, being easy generation carbide causes stone more than 4.0 mass % in cast iron
Ink is precipitated, and influences spheroidizing quality, reduces the intensity and toughness of cast iron.Therefore, 3.10%≤C≤3.90%.
Silicon: Si have the effect of promote carbon graphitization and matrix it is ferritizing, when Si content is larger, spheroidal graphite cast-iron
Toughness reduce, therefore the upper limit be 4.0 mass %.In order to further increase oxidative resistance, therefore 2.00%≤Si≤3.40%.
Manganese: Mn is in order to fix the inevitable impurity i.e. S of material in the form of MnS and required for keeping its innoxious
Element.But due to being the pearlitic structrure formation element of matrix, 0.20%≤Mn≤0.90%.
Molybdenum: Mo is the element that tensile strength and yield stress under high temperature are improved by being fused in matrix admittedly, when Mo contains
When quantitative change is more, Mo and C are 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 lower, pouring temperature is lower, leads to metallographic structure graphite nodule
Change bad, the problems such as number of graphite ball is few or Graphite Precipitation, copper can improve central tissue and graphite form, promote the shape of pearlite
At helping to obtain uniform tissue, improve the mechanical property of ductile cast iron casting, when the content of copper is larger, to graphite cast iron
Annealing it is unfavorable, and ductility can be reduced therefore, 0%≤Cu≤0.6%.
Nickel: being conducive to improve the matrix of graphite cast iron, improve hardness and strength, because of nickel higher cost, therefore 0%≤
Ni≤0.6%.
The processing technology of the metal are as follows:
1) weigh raw material: the raw material includes the pig iron, and steel scrap, give up spheroidal graphite cast-iron, molybdenum-iron, ferrosilicon and rare earth alloy, described
Raw material weight ratio are as follows: 6.25: 1.6: 2: (0.013-0.015): (0.02-0.04): (0.015-0.02).；
2) melting: the melting carries out melting using 500Kg middle frequency furnace；
3) nodularization: the spheroidizing process are as follows:
A) nodulizer is dry；
B) nodulizer preheats；
C) nodulizer is launched；
4) stokehold is handled: including Alloying Treatment, chemical component detection；
5) it is poured, molten iron tapping temperature is 1520 DEG C -1580 DEG C, and pouring temperature is 1410 DEG C -1460 DEG C.；
6) it is heat-treated, the heat treatment process are as follows:
A) prefabricated component is warming up to 800-850 DEG C；
B) prefabricated component is kept the temperature 2-3 hours；
C) the prefabricated component furnace is cooled to room temperature.
A kind of spheroidal graphite cast-iron disclosed in this invention and its processing technology, suitable for reusing the waste and old pig iron steel mill
With waste and old spheroidal graphite cast-iron, the power of the mine blocking plate casting in the case of actual use is met for the chemical component of guarantee gained spheroidal graphite cast-iron
Performance is learned, its processing technology should also be made as defined below:
For guarantee it is melting down after molten iron spheroidizing quality, nodulizer granule size should be 3-8mm in spheroidizing process；
To guarantee that the chemical composition and mechanical property of the spheroidal graphite cast-iron obtained meets actual demand, molten iron is coped with before casting
Carry out stokehold detection, technique are as follows:
After liquid iron balling processing, sample examination detects chemical component, is poured chill block, the spoken parts in traditional operas that observation fracture is presented
Degree tentatively judges spheroidization.After spheroidising, stirring, it is ladle-to-ladle when, iron liquid surface scurry out flare be magnesium evolution burning
Phenomenon.The more more length is stronger for flare, and nodularization better, judges as follows:
1) flare is observed:
A) big flare length is greater than 40mm, and 3 or more；Small flare is more and strong, and spheroidization is good；
B) 1-2, big flare, accompanies 10, small flare or more, spheroidization is slightly good；
C) small flare is less than 15mm, powerless less, and spheroidization is general (decline is fast)；
D) flare, non-nodularization are not seen；
2) iron liquid skin covering of the surface is observed:
A) iron liquid surface is tranquil, covers one layer of oxidation elephant skin, and temperature declines, and outer skin is colourful.Central part in ladle
Position molten iron surface raises upward, and surrounding is sunk, and shows that liquid iron balling is good；
B) molten iron surface portion protrusion or raised position are uneven, show half nodularization；
C) surface is seethed seriously, and oxide skin is few, and concentrates on center, shows non-nodularization.
3) chill block:
A) the wide 25mm in test block section × 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, outstanding to have hit steel sound, and immersion has calcium carbide taste.
4) cylinder coupon:
Diameter is generally most thick 0.8 times of casting, 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, observation end are reduced into φ 10-15；It polishes after polishing by standard rating.
To guarantee that the prefabricated component of casting meets needs of production, casting is avoided stomata, shrinkage cavity, crackle, slag inclusion etc. occur
Casting flaw, pouring technology are as follows:
White mould is made, white die topography repairing, the Cast Iron Surface of Yin Baimo casting is also easy to produce defect, therefore white mould surface should protect
Stay the machining allowance more than or equal to 5mm.
Dialogue die coating swabbing before being poured, coating carry out dialogue mould after drying and carry out second of spraying, paint thickness control
System is in 2-3mm.
To guarantee that the prefabricated component of each casting meets needs of production, tried in injection molded process with case casting tensile strength
Stick, and coupon progress chemical component and mechanical property are tested and analyzed.
For the internal stress for eliminating nodularization cast iron prefabricated component, improves metal structure to obtain better mechanical property, be heat-treated
Technique are as follows:
A) prefabricated component is warming up to 800-850 DEG C；
B) prefabricated component is kept the temperature 2-3 hours；
C) the prefabricated component furnace is cooled to room temperature.
The coupon performance evaluation of 1 embodiment 1 of table
Embodiment 2-6
By a kind of processing method of above-mentioned mine blocking plate, the embodiment of chemical component different quality percentage is prepared
2-6, the mine blocking plate chemical component and coupon performance that each embodiment obtains are as shown in the table:
The chemical component and corresponding coupon performance evaluation of 2 embodiment 2-6 of table
Casting graphite is largely in bulk and spherical, and remaining cotton-shaped for group, Oxygen potential 85-90% reaches nodularization three-level or three
Grade or more；Matrix pearlite fraction >=85%.
Spheroidal graphite cast-iron of the invention elevated temperature strength with higher and good ductility.Consequently, it is possible at 800 DEG C or more
Temperature region use, and rare earth element demand is low, has the advantages that good in economic efficiency.
In above-mentioned spheroidal graphite cast-iron, preferably the Oxygen potential of graphite is 85% or more.By making the Oxygen potential 80% of graphite,
It can be improved the tensile strength and yield stress under high temperature.Use the high temperature strength for the mine blocking plate that above-mentioned spheroidal graphite cast-iron manufactures
And excellent impact resistance.According to the present invention, by forming above-mentioned composition, elevated temperature strength and impact resistance can be manufactured with low cost
Spheroidal graphite cast-iron excellent and with excellent ductility.
The present invention provides a kind of mine blocking plate and its processing technology, and processing method provided by the invention is economical good excellent
Point has impact resistance good, advantage resistant to high temperature by the mine blocking plate that the processing method obtains.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
Limitation of the invention, protection scope of the present invention should be defined by the scope defined by the claims..For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, several improvements and modifications can also be made, these change
It also should be regarded as protection scope of the present invention into retouching.
Claims (3)
1. a kind of processing technology of mine blocking plate, which is characterized in that a kind of processing technology of mine blocking plate are as follows:
1) by the pig iron, steel scrap, give up spheroidal graphite cast-iron, molybdenum-iron, and ferrosilicon and rare earth alloy mixing obtain mixture；
2) mixture is put into 500Kg middle frequency furnace and carries out melting, the molten iron that melting obtains is transferred to after melting down remove slag
Ladle；
3) use pours method and carries out nodularization to molten iron；
4) molten iron after the nodularization is poured, obtains prefabricated component；
5) prefabricated component is heat-treated, obtains a kind of mine blocking plate, the chemical component of the mine blocking plate is by weight percentage
It include: C=3.8%, Si=2.8%, Mn=0.3%, Mo=0.4%, Cu=0.6%, Ni=0.6%, surplus is iron；
The tapping temperature of the molten iron is 1520 DEG C -1580 DEG C, and pouring temperature is 1410 DEG C -1460 DEG C, and come out of the stove from molten iron, into
Row spheroidizing process is poured, and 4 points is less than or equal to when sharing 30 seconds；
Heat treatment process are as follows:
1) prefabricated component is warming up to 800-850 DEG C；
2) prefabricated component is kept the temperature 2-3 hours；
3) the prefabricated component furnace is cooled to room temperature.
2. a kind of processing technology of mine blocking plate according to claim 1, which is characterized in that the mass ratio of nodulizer and molten iron
For 1.5:100, nodulizer granule size is 5-10mm.
3. a kind of processing technology of mine blocking plate according to claim 1, which is characterized in that spheroidizing process are as follows: will be dry pre-
Ladle bottom is added in nodulizer after heat, and nodulizer covers 1.5-2.5kg ferrosilicon, then is compacted into and presses after covering iron filings
Molten iron is added from the other side of ladle bottom, carries out spheroidising to the molten iron by the steel plate of 6mm thickness.
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| CN201610784567.1A CN106467949B (en) | 2016-08-31 | 2016-08-31 | A kind of mine blocking plate and its processing technology |
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| CN201610784567.1A CN106467949B (en) | 2016-08-31 | 2016-08-31 | A kind of mine blocking plate and its processing technology |
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| 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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| JP2004011022A (en) * | 2002-06-12 | 2004-01-15 | Aomori Prefecture | Spherical graphite cast-iron excellent in weathering resistance and its production method |
| CN101736190B (en) * | 2009-12-09 | 2014-06-25 | 扬州电力设备修造厂 | Alloy austenitic-bainite ductile iron worm gear and preparation process thereof |
| CN102974777A (en) * | 2012-12-17 | 2013-03-20 | 沈阳机床银丰铸造有限公司 | Hot ladle spheroidizing process |
| 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 |
| CN104846265B (en) * | 2015-04-27 | 2017-10-17 | 沈阳铸锻工业有限公司 | A kind of ultralow temperature austenite abrasion-proof magnesium iron material and preparation method thereof |
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