CN104313476B - End plate for SPHC (steel plate heat commercial) tubular pile and production technique for end plate - Google Patents
End plate for SPHC (steel plate heat commercial) tubular pile and production technique for end plate Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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Abstract
The invention discloses an end plate for an SPHC (steel plate heat commercial) tubular pile. The end plate includes the following components according to mass percentages: 0.17 to 0.20 percent of C (carbon), 0.50 to 0.70 percent of Si (silicon), 0.50 to 0.85 percent of Mn (manganese), 0.035 percent or less of S (sulfur), 0.025 percent or less of P (phosphorus), 0.20 percent or less of Cu (copper), 0.080 to 0.095 percent of Cr (chromium), 0.25 to 0.39 percent of Mo (molybdenum), 0.01 to 0.02 percent of Nb (niobium), 0.05 to 0.06 percent of V (vanadium), 0.04 to 0.05 percent of Ti (titanium), and the balance of Fe (iron) and unavoidable impurities. The invention further provides a production technique for the end plate for the SPHC tubular pile. The production technique includes the following main process: preparation of a casting mold, spray coating of the casting mold, smelting, casting, heat treatment, and machining and punching to obtain the finished end plate for the SPHC tubular pile. The end plate has a high strength, is highly resistant to delayed fracture, and can be easily welded; the production technique is simple and has few procedures; the energy consumption and the manufacture cost are low, and the production efficiency is high.
Description
Technical field
The present invention relates to a kind of end plate and its production technology, and in particular to a kind of SPHC end plate for tube pile and its production technology, belong to
Building pile foundation production field.
Background technology
Adopt precast prestressed concrete driven pile reduced investment, short time limit in harbour, the pile foundation engineering of bridge, its superiority is
It will be apparent that due to having good engineering property, especially with the maintenance cost of phase, to compare its superiority of piling bar more aobvious prominent
Go out, therefore user and the general all first-selections as much as possible of designer use concrete-pile, when square pile, bored concrete pile etc. are unable to where applicable
And then select prestressed concrete pipe pile (Big Pipe Pile or PHC stake), now, prestressed concrete pipe pile is widely used to respectively
In the pile foundation of class engineering.
In recent years, the engineering such as China's harbour bridge forward direction deep water, off-lying sea, the direction fast development maximized, to engineering base
The structural mechanical property of stake and engineering property are put forward higher requirement, promote engineering foundation pile constantly to the longer single-unit of larger diameter # and
More (thick) steel strand wires (or rod iron) develops, to adapt to complicated severe natural environmental condition.For this reason, we combine now
There is concrete tubular pile (Big Pipe Pile and PHC stake), develop the more excellent novel prefabricated concrete pile tube-SPHC of performance
Stake (pre-tensioning system steel strand prestress concrete tubular pile), to adapt to the demand in market, and the end plate of existing pile tube is of low quality, holds
Perishable, and cost of manufacture is high, expensive.
Content of the invention
The technical problem to be solved is, for the shortcoming of above prior art presence, proposes a kind of SPHC pile tube end
Plate and its production technology, this end plate intensity is high, ductility is good, anti-delayed fracture resistance is strong, the advantages of easily weld, and it produces work simultaneously
Skill is simple to operation, production process is few, and consume energy low, low manufacture cost, and production efficiency is high.
The present invention solve above technical problem technical scheme be：
A kind of SPHC end plate for tube pile, end plate includes following components by mass percentage：C：0.17-0.20%, Si：
0.50-0.70%, Mn：0.50-0.85%, S≤0.035%, P≤0.025%, Cu≤0.20%, Cr：0.080-0.095%, Mo：
0.25-0.39%, Nb：0.01-0.02%, V：0.05-0.06%, Ti：0.04-0.05%, balance of Fe and inevitably
Impurity.
The technical scheme that the present invention limits further is：
In aforesaid SPHC end plate for tube pile, end plate includes following components by mass percentage：C：0.17%, Si：0.60%,
Mn：0.85%, S：0.025%, P：0.025%, Cu：0.15%, Cr:0.095%, Mo：0.30%, Nb：0.02%, V：
0.055%, Ti：0.05%, balance of Fe and inevitable impurity.
In aforesaid SPHC end plate for tube pile, end plate includes following components by mass percentage：C：0.20%, Si：0.50%,
Mn：0.50%, S：0.015%, P：0.015%, Cu：0.10%, Cr:0.080%, Mo：0.39%, Nb：0.01%, V：
0.05%, Ti：0.04%, balance of Fe and inevitable impurity.
In aforesaid SPHC end plate for tube pile, end plate includes following components by mass percentage：C：0.19%, Si：0.70%,
Mn：0.70%, S：0.035%, P：0.010%, Cu：0.20%, Cr:0.086%, Mo：0.25%, Nb：0.015%, V：
0.06%, Ti：0.045%, balance of Fe and inevitable impurity.
The present invention have also been devised a kind of production technology of SPHC end plate for tube pile, and this production technology concrete operation step is as follows：
(1) casting mold is blended according to the size of reality end plate to be designed stand-by；
Mold material is silica sand by mass percentage：88%th, bentonite：10%th, additive：0.5% and water：1.5%；
Silica sand is to be mixed by 50/100-70/140 mesh silica sand, and bentonite is sodium bentonite and calcium-base bentonite mixture, adds
Plus agent is α starch or dextrin；
(2) spray a coating to the mo(U)ld face that step (1) makes, coating comprises following components by mass percentage：
Zirconium English powder：90-93%, epoxy resin：2-4%, bentonite：1-3% and titanium dioxide：0.5-1%, above sum is 100%；
(3) above-mentioned chemical constituent dispensing is carried out smelting and obtain molten steel, smelting temperature is 1250-1400 DEG C, smelt 4-6h, and
Add copper in smelting process, copper percentage composition is the 0.1-0.3% of chemical constituent dispensing total amount；
(4) molten steel smelted in step (3) is poured in ladle, calm 5-8min, add in ladle during calmness
Nodulizer carries out spheroidising, after spheroidizing reacion terminates, dispenses perlite slag making to purify original iron melt and to take off at once on molten steel
Slag, adds inovulant to carry out inoculation 8-10min in backward ladle of skimming, inoculation dispenses precious again on molten steel after terminating
Pearl rock slag making is to purify original iron melt and to skim at once；
(5) by the molten steel standing 10-15min after skimming again in step (4), it is then injected in the casting mold of step (1)
It is cast into end plate blank, the duration of pouring is 10-13min, pouring temperature controls at 1100-1200 DEG C；
(6) end plate blank feeding heating furnace is heated to 1350-1500 DEG C, then will be quick for end plate blank through the first refrigerating work procedure
Degree is cooled to 900-1000 DEG C, and then in quenching unit, quenching liquid is quenched, and quench 30-35s, is then passed through tempering heating
Stove heat to 1000-1100 DEG C is tempered, then is cooled to room temperature by the second cooling technique；
First refrigerating work procedure is to adopt compressed air or vaporific quenching liquid to be cooled to end plate blank with the cooldown rate of 10-12 DEG C/s
900-1000℃；
Second refrigerating work procedure is combined with air cooling using water-cooled, first adopts water-cooled with the cooldown rate of 2-3 DEG C/s by end plate blank water-cooled
To 700-850 DEG C, then it is air cooled to 400-450 DEG C, then adopt water-cooled with the cooldown rate of 3-6 DEG C/s by end plate blank water-cooled extremely
Room temperature；
(7) by end plate blank through blast cleaning and machining, trimming, deburring, obtain this finished product of end plate, then to end plate
Semi-finished product are machined out successively, specific as follows：Processing endoporus, processing plane, punching, tapping, punching obtain holding semi-finished product；
(8) the end plate finished product obtaining is carried out with ultrasonic and magnetic powder Non-Destructive Testing, what detection was qualified is qualified end plate finished product
And put in storage.
The technical scheme that the present invention limits further is：
In the production technology of aforementioned SPHC end plate for tube pile, when chemical analysis being smelted in step (3), adopt acid lining
Medium-frequency induction furnace.
In the production technology of aforementioned SPHC end plate for tube pile, carry out the chemistry of the inovulant of addition during inoculation in step (4)
Composition includes by mass percentage：Si：75-80%, Al：0.5-0.7%, S≤0.06%, O≤0.08%, remaining is Fe
And inevitable impurity, and add the 0.5-0.8% that inovulant weight/mass percentage composition is chemical constituent dispensing total amount.
The invention has the beneficial effects as follows：
The present invention using molding sand casting by the way of, with molding sand make casting mold when before being dried in the surface-coated one of molding sand
Coating, the humidity that this coating can reduce molding sand can guarantee that molding sand is indeformable again, when molten steel entrance casting mold carries out molding, due to
The humidity of molding sand reduces the generation decreasing gas, and then decreases the generation of shaped article surface pores.
Present invention process adds a small amount of copper when smelting molten steel, and copper can improve quenching degree, simultaneously as adding copper, carefully
Change pearlite and graphite, reduce thin section spoken parts in traditional operas, improve big cross section structure sensitive properties；Mechanical property improves product strength,
Hardness, toughness；Wearability, the thermostability agent corrosivity of product are improve on serviceability, improves the cause of product meanwhile
Density.
The present invention all dispenses perlite to purify original iron melt after spheroidising and inoculation, and perlite is a kind of efficient deslagging agent,
Uniformly dispense behind the surface of iron liquid, slightly agitation can be agglomerated into rapidly the skull being easily isolated with metallic solution, pulls down skull
Pure molten steel can be obtained afterwards, reduce foundry goods burning into sand, improve quality, and during the low cost of perlite itself, and use
Not quick-fried do not splash, safe and reliable, be easy to use, perlite is pollution-free on iron liquid, no infiltration, do not affect its chemical analysis and foundry goods
Mechanical performance, in use smokeless free from dust and harmful gass pollution, can environment purification, reach and carry out production strictly in line with rules and regulations；
Having carried out inoculation in present invention process can prevent the super cooling tendency making spheroidal graphite cast-iron because of the addition of nodulizer from increasing, from
And reduce the precipitation of carbide, promote to separate out the tiny in a large number and graphite nodule of rounding, wherein, the inovulant of employing can make ball milling cast
Evenly, toughness is more preferable for the microscopic structure of ferrum；
The combination property that the refrigerating work procedure that product is tempered, quenched and arranged in pairs or groups after moulding by casting of the present invention can improve product has
Also there is outside hardness certain toughness, after quenching, obtain tiny martensitic structure, a number of tempered martensite can also be obtained
Body is it is ensured that the high rigidity of product improves the toughness of product simultaneously again.
In present invention process, the second refrigerating work procedure of step (6) is combined with air cooling using water-cooled, is followed successively by：Water-cooled-air cooling-water-cooled
- air cooling, so, the cooling after tempering controls, and carbide can be made fully to dissolve, and uniformly spreads, it is to avoid carbide exists
The precipitation of intergranular causes intercrystalline corrosion and spot corrosion is exceeded it is ensured that the ferrite content of material is less than 0.5%, and material can also be made solid
Molten fully, it is to avoid heat treatment mode heating is uneven, and the corrosion rate that solid solution inequality is brought is exceeded and hardness is exceeded, thus bringing
Pulling of another technical specification, obtains unexpected technique effect.
In the present invention, the beneficial effect using medium-frequency induction furnace particularly has the advantage that compared to furnace cupola：
Refining quality：The many percent defectives of the impure comparison of cupola melting molten steel are high, and medium-frequency induction furnace melts the quenched percent defective of molten steel
Low, heating-up temperature is uniform, scaling loss is few, metal ingredient is uniform, and fusible metal is relatively more, as long as the metal of magnetic conduction is just
Can melt, the product of production can be with multiformity, strong adaptability, using flexible, every stove iron liquid can all go out only, replacements
It is convenient to plant；
Operating cost：Because furnace cupola adopts coke as fuel, the price of coke is high, and the artificial amount needed for furnace cupola is big,
Manually somewhat expensive, needed for furnace cupola entirety high cost, and medium-frequency induction furnace is simple to operation greatly reduces artificial demand,
Reduce cost；
Environmental protection aspect：Furnace cupola needs follow-up furnace rear charging system, the heat exchanger of waste gas burning, cleaner unit etc. structure,
Overall equipment volume is huge, and can produce the gas of pollution environment as fuel with coke, and medium-frequency induction furnace equipment volume
Little, lightweight, burn-off rate is fast, and production efficiency is high, and operationally the temperature around stove is low, flue dust is few, working environment good.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of SPHC end plate for tube pile, and end plate includes following components by mass percentage：C：0.17%, Si：
0.60%, Mn：0.85%, S：0.025%, P：0.025%, Cu：0.15%, Cr：0.095%, Mo：0.30%, Nb：0.02%,
V：0.055%, Ti：0.05%, balance of Fe and inevitable impurity.
The production technology of above-mentioned SPHC end plate for tube pile, this production technology concrete operation step is as follows：
(1) casting mold is blended according to the size of reality end plate to be designed stand-by；
Mold material is 50/100-70/140 mesh silica sand mixture by mass percentage：88%th, sodium bentonite and calcio swelling
Earth mixtures：10%th, α starch：0.5% and water：1.5%；
(2) spray a coating to the mo(U)ld face that step (1) makes, coating comprises following components by mass percentage：
Zirconium English powder：92%, epoxy resin：4%, bentonite：3% and titanium dioxide：1%；
(3) medium-frequency induction furnace of above-mentioned chemical constituent dispensing feeding acid lining is carried out smelting and obtain molten steel, smelting temperature is
1250 DEG C, smelt 6h, and add copper in smelting process, copper percentage composition is the 0.3% of chemical constituent dispensing total amount；
(4) molten steel smelted in step (3) is poured in ladle, calm 7min, add ball during calmness in ladle
Agent carries out spheroidising, after spheroidizing reacion terminates, dispenses perlite slag making to purify original iron melt and to skim at once on molten steel,
Skim and add in backward ladle inovulant to carry out inoculation 9min, inoculation dispenses perlite again on molten steel after terminating and makes
Slag is to purify original iron melt and to skim at once；
The chemical analysis of inovulant include by mass percentage：Si：78%, Al：00.7%, S：0.05%, O：0.03%,
Remaining is Fe and inevitable impurity, and adds inovulant weight/mass percentage composition for the 0.7% of chemical constituent dispensing total amount；
(5) by the molten steel standing 10min after skimming again in step (4), it is then injected into casting in the casting mold of step (1)
Become end plate blank, the duration of pouring is 12min, pouring temperature controls at 1100 DEG C；
(6) end plate blank feeding heating furnace is heated to 1400 DEG C, then will be cold for end plate blank fast speed through the first refrigerating work procedure
But to 1000 DEG C, then in quenching unit, quenching liquid is quenched, and quench 32s, is then passed through tempering heating furnace and is heated to 1000
DEG C tempering, then is cooled to room temperature by the second cooling technique；
First refrigerating work procedure is to adopt compressed air or vaporific quenching liquid, with the cooldown rate of 11 DEG C/s, end plate blank is cooled to 1000
℃；
Second refrigerating work procedure is combined with air cooling using water-cooled, first adopts water-cooled with the cooldown rate of 2.5 DEG C/s by end plate blank water-cooled
To 700 DEG C, be then air cooled to 420 DEG C, then adopt water-cooled with the cooldown rate of 3 DEG C/s by end plate blank water-cooled to room temperature；
(7) by end plate blank through blast cleaning and machining, trimming, deburring, obtain this finished product of end plate, then to end plate
Semi-finished product are machined out successively, specific as follows：Processing endoporus, processing plane, punching, tapping, punching obtain holding semi-finished product；
(8) the end plate finished product obtaining is carried out with ultrasonic and magnetic powder Non-Destructive Testing, what detection was qualified is qualified end plate finished product
And put in storage.
Embodiment 2
The present embodiment provides a kind of SPHC end plate for tube pile, and end plate includes following components by mass percentage：C：0.20%, Si：
0.50%, Mn：0.50%, S：0.015%, P：0.015%, Cu：0.10%, Cr：0.080%, Mo：0.39%, Nb：0.01%,
V：0.05%, Ti：0.04%, balance of Fe and inevitable impurity.
The production technology of above-mentioned SPHC end plate for tube pile, this production technology concrete operation step is as follows：
(1) casting mold is blended according to the size of reality end plate to be designed stand-by；
Mold material is 50/100-70/140 mesh silica sand mixture by mass percentage：88%th, sodium bentonite and calcio swelling
Earth mixtures：10%th, dextrin：0.5% and water：1.5%,；
(2) spray a coating to the mo(U)ld face that step (1) makes, coating comprises following components by mass percentage：
Zirconium English powder：93%, epoxy resin：4%, bentonite：2% and titanium dioxide：1%；
(3) medium-frequency induction furnace of above-mentioned chemical constituent dispensing feeding acid lining is carried out smelting and obtain molten steel, smelting temperature is
1400 DEG C, smelt 4h, and add copper in smelting process, copper percentage composition is the 0.2% of chemical constituent dispensing total amount；
(4) molten steel smelted in step (3) is poured in ladle, calm 8min, add ball during calmness in ladle
Agent carries out spheroidising, after spheroidizing reacion terminates, dispenses perlite slag making to purify original iron melt and to skim at once on molten steel,
Skim and add in backward ladle inovulant to carry out inoculation 10min, inoculation dispenses perlite again on molten steel after terminating and makes
Slag is to purify original iron melt and to skim at once；
The chemical analysis of inovulant include by mass percentage：Si：75%, Al：0.5%, S：0.04%, O：0.05%,
Remaining is Fe and inevitable impurity, and adds inovulant weight/mass percentage composition for the 0.8% of chemical constituent dispensing total amount；
(5) by the molten steel standing 15min after skimming again in step (4), it is then injected into casting in the casting mold of step (1)
Become end plate blank, the duration of pouring is 13min, pouring temperature controls at 1200 DEG C；
(6) end plate blank feeding heating furnace is heated to 1500 DEG C, then will be cold for end plate blank fast speed through the first refrigerating work procedure
But to 900 DEG C, then in quenching unit, quenching liquid is quenched, and quench 35s, is then passed through tempering heating furnace and is heated to 1100
DEG C tempering, then is cooled to room temperature by the second cooling technique；
First refrigerating work procedure is to adopt compressed air or vaporific quenching liquid, with the cooldown rate of 12 DEG C/s, end plate blank is cooled to 900
℃；
Second refrigerating work procedure is combined with air cooling using water-cooled, first adopts water-cooled with the cooldown rate of 3 DEG C/s by end plate blank water-cooled extremely
850 DEG C, be then air cooled to 450 DEG C, then adopt water-cooled with the cooldown rate of 6 DEG C/s by end plate blank water-cooled to room temperature；
(7) by end plate blank through blast cleaning and machining, trimming, deburring, obtain this finished product of end plate, then to end plate
Semi-finished product are machined out successively, specific as follows：Processing endoporus, processing plane, punching, tapping, punching obtain holding semi-finished product；
(8) the end plate finished product obtaining is carried out with ultrasonic and magnetic powder Non-Destructive Testing, what detection was qualified is qualified end plate finished product
And put in storage.
Embodiment 3
The present embodiment provides a kind of SPHC end plate for tube pile, and end plate includes following components by mass percentage：C：0.19%,
Si：0.70%, Mn：0.70%, S：0.035%, P：0.010%, Cu：0.20%, Cr：0.086%, Mo：0.25%,
Nb：0.015%, V：0.06%, Ti：0.045%, balance of Fe and inevitable impurity.
The production technology of above-mentioned SPHC end plate for tube pile, this production technology concrete operation step is as follows：
(1) casting mold is blended according to the size of reality end plate to be designed stand-by；
Mold material is 50/100-70/140 mesh silica sand mixture by mass percentage：88%th, sodium bentonite and calcio swelling
Earth mixtures：10%th, dextrin：0.5% and water：1.5%；
(2) spray a coating to the mo(U)ld face that step (1) makes, coating comprises following components by mass percentage：
Zirconium English powder：92%, epoxy resin：4%, bentonite：3% and titanium dioxide：1%；
(3) medium-frequency induction furnace of above-mentioned chemical constituent dispensing feeding acid lining is carried out smelting and obtain molten steel, smelting temperature is
1300 DEG C, smelt 5h, and add copper in smelting process, copper percentage composition is the 0.1% of chemical constituent dispensing total amount；
(4) molten steel smelted in step (3) is poured in ladle, calm 5min, add ball during calmness in ladle
Agent carries out spheroidising, after spheroidizing reacion terminates, dispenses perlite slag making to purify original iron melt and to skim at once on molten steel,
Skim and add in backward ladle inovulant to carry out inoculation 8min, inoculation dispenses perlite again on molten steel after terminating and makes
Slag is to purify original iron melt and to skim at once；
The chemical analysis of inovulant include by mass percentage：Si：80%, Al：0.6%, S：0.06%, O：0.08%,
Remaining is Fe and inevitable impurity, and adds inovulant weight/mass percentage composition for the 0.5% of chemical constituent dispensing total amount；
(5) by the molten steel standing 12min after skimming again in step (4), it is then injected into casting in the casting mold of step (1)
Become end plate blank, the duration of pouring is 10min, pouring temperature controls at 1150 DEG C；
(6) end plate blank feeding heating furnace is heated to 1350 DEG C, then will be cold for end plate blank fast speed through the first refrigerating work procedure
But to 950 DEG C, then in quenching unit, quenching liquid is quenched, and quench 30s, is then passed through tempering heating furnace and is heated to 1050
DEG C tempering, then is cooled to room temperature by the second cooling technique；
First refrigerating work procedure is to adopt compressed air or vaporific quenching liquid, with the cooldown rate of 10 DEG C/s, end plate blank is cooled to 950
℃；
Second refrigerating work procedure is combined with air cooling using water-cooled, first adopts water-cooled with the cooldown rate of 2 DEG C/s by end plate blank water-cooled extremely
800 DEG C, be then air cooled to 400 DEG C, then adopt water-cooled with the cooldown rate of 5 DEG C/s by end plate blank water-cooled to room temperature；
(7) by end plate blank through blast cleaning and machining, trimming, deburring, obtain this finished product of end plate, then to end plate
Semi-finished product are machined out successively, specific as follows：Processing endoporus, processing plane, punching, tapping, punching obtain holding semi-finished product；
(8) the end plate finished product obtaining is carried out with ultrasonic and magnetic powder Non-Destructive Testing, what detection was qualified is qualified end plate finished product
And put in storage.
In addition to the implementation, the present invention can also have other embodiment.All employing equivalents or the skill of equivalent transformation formation
Art scheme, all falls within the protection domain of application claims.
Claims (6)
1. a kind of SPHC end plate for tube pile it is characterised in that：Described end plate includes following components by mass percentage：C：0.17-0.20%, Si：0.50-0.70%, Mn：0.50-0.85%, S≤0.035%, P≤0.025%, Cu≤0.20%, Cr:0.080-0.095%, Mo：0.25-0.39%, Nb：0.01-0.02%, V：0.05-0.06%, Ti：0.04-0.05%, balance of Fe and inevitable impurity；
This end plate production technology concrete operation step is as follows：
(1) casting mold is blended according to the size of reality end plate to be designed stand-by；
Described mold material is silica sand by mass percentage：88%th, bentonite：10%th, additive：0.5% and water：1.5%, described silica sand is to be mixed by 50/100-70/140 mesh silica sand, and described bentonite is sodium bentonite and calcium-base bentonite mixture, and described additive is α starch or dextrin；
(2) spray a coating to the mo(U)ld face that step (1) makes, described coating comprises following components by mass percentage：Zirconium English powder：90-93%, epoxy resin：2-4%, bentonite：1-3% and titanium dioxide：0.5-1%, above sum is 100%；
(3) above-mentioned chemical constituent dispensing is carried out smelting and obtain molten steel, smelting temperature is 1250-1400 DEG C, smelt 4-6h, and add copper in smelting process, described copper percentage composition is the 0.1-0.3% of described chemical constituent dispensing total amount；
(4) molten steel smelted in step (3) is poured in ladle, calm 5-8min, nodulizer is added to carry out spheroidising during calmness in ladle, after spheroidizing reacion terminates, perlite slag making is dispensed on molten steel to purify original iron melt and to skim at once, skim and add in backward ladle inovulant to carry out inoculation 8-10min, inoculation dispenses perlite slag making again to purify original iron melt and to skim at once after terminating on molten steel；
(5) by the molten steel standing 10-15min after skimming again in step (4), it is cast into end plate blank in the casting mold being then injected into step (1), the duration of pouring is 10-13min, pouring temperature controls at 1100-1200 DEG C；
(6) end plate blank feeding heating furnace is heated to 1350-1500 DEG C, then through the first refrigerating work procedure, end plate blank fast speed is cooled to 900-1000 DEG C, then in quenching unit, quenching liquid is quenched, quenching 30-35s, it is then passed through tempering heating furnace and is heated to 1000-1100 DEG C of tempering, then room temperature is cooled to by the second cooling technique；
The first described refrigerating work procedure is to adopt compressed air or vaporific quenching liquid, with the cooldown rate of 10-12 DEG C/s, end plate blank is cooled to 900-1000 DEG C；
The second described refrigerating work procedure is combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 2-3 DEG C/s by end plate blank water-cooled to 700-850 DEG C, then be air cooled to 400-450 DEG C, then adopt water-cooled with the cooldown rate of 3-6 DEG C/s by end plate blank water-cooled to room temperature；
(7) by end plate blank through blast cleaning and machining, trimming, deburring, end plate semi-finished product are obtained, then opposite end boards half-finished product is machined out successively, specific as follows：Processing endoporus, processing plane, punching, tapping, punching obtain end plate finished product；
(8) the end plate finished product obtaining is carried out with ultrasonic and magnetic powder Non-Destructive Testing, qualified being qualified end plate finished product and put in storage of detection.
2. SPHC end plate for tube pile according to claim 1 it is characterised in that：Described end plate includes following components by mass percentage：C：0.17%, Si：0.60%, Mn：0.85%, S：0.25%, P：0.025%, Cu：0.15%, Cr:0.095%, Mo：0.30%, Nb：0.02%, V：0.055%, Ti：0.05%, balance of Fe and inevitable impurity.
3. SPHC end plate for tube pile according to claim 1 it is characterised in that：Described end plate includes following components by mass percentage：C：0.20%, Si：0.50%, Mn：0.50%, S：0.015%, P：0.015%, Cu：0.10%, Cr:0.080%, Mo：0.39%, Nb：0.01%, V：0.05%, Ti：0.04%, balance of Fe and inevitable impurity.
4. SPHC end plate for tube pile according to claim 1 it is characterised in that：Described end plate includes following components by mass percentage：C：0.19%, Si：0.70%, Mn：0.70%, S：0.035%, P：0.010%, Cu：0.20%, Cr:0.086%, Mo：0.25%, Nb：0.015%, V：0.06%, Ti：0.045%, balance of Fe and inevitable impurity.
5. according to claim 1 SPHC end plate for tube pile production technology it is characterised in that：The medium-frequency induction furnace of acid lining is adopted when chemical analysis being smelted in described step (3).
6. according to claim 1 SPHC end plate for tube pile production technology it is characterised in that：The chemical analysis carrying out the inovulant of addition during inoculation in described step (4) include by mass percentage：Si：75-80%, Al：0.5-0.7%, S≤0.06%, O≤0.08%, remaining is Fe and inevitable impurity, and adds the 0.5-0.8% that inovulant weight/mass percentage composition is described chemical constituent dispensing total amount.
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