CN104313476A - 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
- C22C—ALLOYS
- 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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- 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
- C22C38/12—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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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 production technique thereof, be specifically related to a kind of SPHC end plate for tube pile and production technique thereof, belong to building pile foundation production field.
Background technology
In the pile foundation engineering of harbour, bridge, adopt precast prestressed concrete driven pile reduced investment, duration short, its superiority is apparent, owing to having good engineering property, especially to compare its superiority of piling bar more aobvious outstanding for the maintenance cost of usage period, therefore user and the general first-selected use concrete pile all as much as possible of planner, when square pile, castinplace pile etc. can not where applicables and then select prestressed concrete pipe pile (Big Pipe Pile or PHC stake), now, prestressed concrete pipe pile has been widely used in the pile foundation of all kinds of engineering.
In recent years; the direction of the engineering forward deep water such as China's harbour bridge, off-lying sea, maximization is fast-developing; have higher requirement to the structural mechanical property of engineering foundation pile and engineering property; impel engineering foundation pile constantly to the longer single-unit of larger diameter # and Geng Duo (slightly) steel strand (or rod iron) development, to adapt to complicated severe natural environmental condition.For this reason, we are in conjunction with the advantage of existing concrete pile tube (Big Pipe Pile and PHC stake), develop the novel prefabricated concrete pile tube-SPHC stake (pretensioning method steel strand prestress concrete tubular pile) that performance is more excellent, to adapt to the demand in market, and the end plate of existing pile tube is of low quality, easy corrosion, and cost of manufacture is high, expensive.
Summary of the invention
Technical problem to be solved by this invention is, for the shortcoming that above prior art exists, a kind of SPHC end plate for tube pile and production technique thereof are proposed, the advantages such as this end plate intensity is high, ductility good, anti-delayed fracture resistance strong, easy welding, its production technique is simple to operation simultaneously, production process is few, consume energy low, cost of manufacture is low, and production efficiency is high.
The technical scheme that the present invention solves above technical problem is:
A kind of SPHC end plate for tube pile, end plate comprises following component 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%, surplus is Fe and inevitable impurity.
The technical scheme that the present invention limits further is:
In aforesaid SPHC end plate for tube pile, end plate comprises following component by mass percentage: C:0.17%, Si:0.60%, Mn:0.85%, S:0.0:25%, P:0.025%, Cu:0.:15 %, Cr:0.095%, Mo:0.30%, Nb:0.02%, V:0.055%, Ti:0.05%, surplus is Fe and inevitable impurity.
In aforesaid SPHC end plate for tube pile, end plate comprises following component 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%, surplus is Fe and inevitable impurity.
In aforesaid SPHC end plate for tube pile, end plate comprises following component 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%, surplus is Fe and inevitable impurity.
The present invention have also been devised a kind of production technique of SPHC end plate for tube pile, and this production technique concrete operation step is as follows:
(1) casting mold processed is mixed according to the actual size that will design end plate stand-by;
Mold material is silica sand by mass percentage: 88%, wilkinite: 10%, additive: 0.5% and water: 1.5 %;
Silica sand is mixed by 50/100-70/140 order silica sand, and wilkinite is sodium bentonite and calcium-base bentonite mixture, and additive is α starch or dextrin;
(2) mo(U)ld face made to step (1) sprays a coating, and coating comprises following component by mass percentage: zirconium English powder: 90-93%, epoxy resin: 2-4%, wilkinite: 1-3% and titanium dioxide: 0.5-1%, and above sum is 100%;
(3) above-mentioned chemical composition batching is carried out smelting and obtain molten steel, smelting temperature is 1250-1400 DEG C, smelts 4-6h, and add copper in smelting process, and copper percentage composition is the 0.1-0.3% of chemical composition batching total amount;
(4) molten steel smelted in step (3) is poured in ladle, calm 5-8min, between killing period, in ladle, add nodulizing agent carry out spheroidizing, after spheroidizing reacion terminates, on molten steel, the slag making of spreading perlite is to purify original iron melt and to skim at once, skim and add nucleating agent in backward ladle and carry out inoculation 8-10min, after inoculation terminates again on molten steel the slag making of spreading perlite to purify original iron melt and to skim at once;
(5) molten steel in step (4) after again skimming is left standstill 10-15min, be cast into end plate blank in the casting mold of then implantation step (1), the duration of pouring is 10-13min, and teeming temperature controls at 1100-1200 DEG C;
(6) end plate blank is sent into process furnace and be 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 device, hardening liquid quenches, quenching 30-35s, then be heated to 1000-1100 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
First refrigerating work procedure is adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 10-12 DEG C/s, end plate blank is chilled to 900-1000 DEG C;
Second refrigerating work procedure adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 2-3 DEG C/s by end plate blank water-cooled to 700-850 DEG C, then air cooling is to 400-450 DEG C, then adopt water-cooled with the rate of cooling of 3-6 DEG C/s by end plate blank water-cooled to room temperature;
(7) by end plate blank through shot blasting and mechanical workout, trimming, deburring, obtain this finished product of end plate, then carries out machining successively to end plate board finished product, specific as follows: processing endoporus, processing plane, punching, tapping, punching obtain end plate finished product;
(8) ultrasonic and magnetic nondestructive testing is carried out to the end plate finished product obtained, detect qualified being qualified end plate finished product and putting in storage.
The technical scheme that the present invention limits further is:
In the production technique of aforementioned SPHC end plate for tube pile, when Chemical Composition being smelted in step (2), adopt the medium-frequency induction furnace of acid lining.
In the production technique of aforementioned SPHC end plate for tube pile, the Chemical Composition of the nucleating agent added when carrying out inoculation in step (4) comprises by mass percentage: Si:75-80%, Al:0.5-0.7%, S≤0.06%, O≤0.08%, all the other be Fe and can not surface impurity, and add nucleating agent mass percentage be chemical composition batching total amount 0.5-0.8%.
The invention has the beneficial effects as follows:
The mode that the present invention adopts molding sand to cast, with molding sand make casting mold time before drying at surface-coated one coating of molding sand, the humidity that this coating can reduce molding sand can ensure that again molding sand is indeformable, molten steel enter casting mold carry out shaping time, because the humidity of molding sand reduces the generation decreasing gas, and then decrease the generation of moulding product surface porosity.
Present invention process adds a small amount of copper when smelting molten steel, and copper can improve hardening capacity, meanwhile, owing to adding copper, refine pearlite and graphite, the thin section spoken parts in traditional operas of minimizing, improves big cross section structure sensitive properties; Mechanical property improves product strength, hardness, toughness; Use properties improves the wear resistance of product, thermotolerance agent corrodibility, meanwhile, improves the density of product.
The present invention after spheroidizing and inoculation equal spreading perlite to purify original iron melt, perlite is a kind of efficient deslagging agent, even spreading is behind the surface of iron liquid, stir a little and can be agglomerated into rapidly the skull being easy to metallic solution be separated, pure molten steel can be obtained after pulling down skull, subduction foundry goods burning into sand, improve quality, and the cost of perlite itself is low, and not quick-friedly in use procedure not spatter, safe and reliable, easy to use, perlite is pollution-free to iron liquid, without infiltration, do not affect the mechanical property of its Chemical Composition and foundry goods, in using, smokeless free from dust and obnoxious flavour pollute, 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 because adding of nodulizing agent makes the super cooling tendency of spheroidal graphite cast iron increase, thus reduce the precipitation of carbide, promote precipitation tiny in a large number and the graphite pebbles of rounding, wherein, adopt nucleating agent can make nodular cast iron microstructure evenly, toughness is better;
To the over-all properties that product carries out tempering, quenching refrigerating work procedure of arranging in pairs or groups can improve product, namely there is hardness after casting of the present invention and also there is certain toughness outward, tiny martensitic stucture is obtained after quenching, the tempered martensite of some amount can also be obtained, ensure that the high rigidity of product turn improves the toughness of product simultaneously.
In present invention process, the second refrigerating work procedure of step (6) adopts water-cooled to be combined with air cooling, be followed successively by: water-cooled-air cooling-water-cooled-air cooling, like this, controlled by the cooling after tempering, carbide can be made fully to dissolve, even diffusion, avoiding carbide causes intergranular corrosion and spot corrosion to exceed standard in the precipitation of intergranular, ensure that the ferrite content of material is less than 0.5%, material solid solution can also be made abundant, avoid heat treatment mode heating uneven, the erosion rate that solid solution inequality is brought exceeds standard and hardness exceeds standard, thus bring pulling of another technical indicator, obtain beyond thought technique effect.
The beneficial effect of medium-frequency induction furnace is used particularly to have the following advantages compared to cupola furnace tool in the present invention:
Refining quality: the impure many scrap rate of cupola melting molten steel are high, the modified scrap rate of medium-frequency induction furnace fusing molten steel is low, Heating temperature is even, scaling loss is few, metal ingredient is even, and fusible metal is many, as long as the metal of magnetic conduction just can melt, the product of production can diversity, strong adaptability, use flexibly, every stove iron liquid can all go out only, changes kind convenient;
Running cost: because cupola furnace adopts coke as fuel, the price of coke is high, and artificial amount needed for cupola furnace is large, manually somewhat expensive, cost needed for cupola furnace entirety is high, and medium-frequency induction furnace is simple to operation greatly reduces artificial demand, reduces cost;
Environmental protection aspect: cupola furnace needs heat exchanger, fly-ash separator etc. the structure of charging system after follow-up stove, waste-gas burning, overall equipment volume is huge, and the gas of contaminate environment can be produced as fuel with coke, and medium-frequency induction furnace equipment volume is little, lightweight, burn-off rate is fast, production efficiency is high, and the temperature operationally around stove is low, flue dust is few, operating environment is good.
Embodiment
embodiment 1
The present embodiment provides a kind of SPHC end plate for tube pile, and end plate comprises following component by mass percentage: C:0.17%, Si:0.60%, Mn:0.85%, S:0.0:25%, P:0.025%, Cu:0.:15 %, Cr:0.095%, Mo:0.30%, Nb:0.02%, V:0.055%, Ti:0.05%, surplus is Fe and inevitable impurity.
The production technique of above-mentioned SPHC end plate for tube pile, this production technique concrete operation step is as follows:
(1) casting mold processed is mixed according to the actual size that will design end plate stand-by;
Mold material is 50/100-70/140 order silica sand mixture by mass percentage: 88%, sodium bentonite and calcium-base bentonite mixture: 10%, α starch: 0.5% and water: 1.5 %;
(2) mo(U)ld face made to step (1) sprays a coating, and coating comprises following component by mass percentage: zirconium English powder: 92%, epoxy resin: 4%, wilkinite: 3% and titanium dioxide: 1%;
(3) medium-frequency induction furnace that above-mentioned chemical composition batching sends into acid lining is carried out smelting and obtain molten steel, smelting temperature is 1250 DEG C, smelts 6h, and add copper in smelting process, and copper percentage composition is 0.3% of chemical composition batching total amount;
(4) molten steel smelted in step (3) is poured in ladle, calm 7min, between killing period, in ladle, add nodulizing agent carry out spheroidizing, after spheroidizing reacion terminates, on molten steel, the slag making of spreading perlite is to purify original iron melt and to skim at once, skim and add nucleating agent in backward ladle and carry out inoculation 9min, after inoculation terminates again on molten steel the slag making of spreading perlite to purify original iron melt and to skim at once;
The Chemical Composition of nucleating agent comprises by mass percentage: Si:78%, Al:00.7%, S:0.0:5%, O:0.0:3%, all the other be Fe and can not surface impurity, and add nucleating agent mass percentage be chemical composition batching total amount 0.7%;
(5) molten steel in step (4) after again skimming is left standstill 10min, be cast into end plate blank in the casting mold of then implantation step (1), the duration of pouring is 12min, and teeming temperature controls at 1100 DEG C;
(6) end plate blank is sent into process furnace and be heated to 1400 DEG C, then through the first refrigerating work procedure, end plate blank fast speed is cooled to 1000 DEG C, then in quenching device, hardening liquid quenches, quenching 32s, then be heated to 1000 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
First refrigerating work procedure is adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 11 DEG C/s, end plate blank is chilled to 1000 DEG C;
Second refrigerating work procedure adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 2.5 DEG C/s by end plate blank water-cooled to 700 DEG C, then air cooling to 420 DEG C, then adopt water-cooled with the rate of cooling of 3 DEG C/s by end plate blank water-cooled to room temperature;
(7) by end plate blank through shot blasting and mechanical workout, trimming, deburring, obtain this finished product of end plate, then carries out machining successively to end plate board finished product, specific as follows: processing endoporus, processing plane, punching, tapping, punching obtain end plate finished product;
(8) ultrasonic and magnetic nondestructive testing is carried out to the end plate finished product obtained, detect qualified being qualified end plate finished product and putting in storage.
embodiment 2
The present embodiment provides a kind of SPHC end plate for tube pile, and end plate comprises following component 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%, surplus is Fe and inevitable impurity.
The production technique of above-mentioned SPHC end plate for tube pile, this production technique concrete operation step is as follows:
(1) casting mold processed is mixed according to the actual size that will design end plate stand-by;
Mold material is 50/100-70/140 order silica sand mixture by mass percentage: 88%, sodium bentonite and calcium-base bentonite mixture: 10%, dextrin: 0.5% and water: 1.5 %;
(2) mo(U)ld face made to step (1) sprays a coating, and coating comprises following component by mass percentage: zirconium English powder: 93%, epoxy resin: 4%, wilkinite: 2% and titanium dioxide: 1%;
(3) medium-frequency induction furnace that above-mentioned chemical composition batching sends into acid lining is carried out smelting and obtain molten steel, smelting temperature is 1400 DEG C, smelts 4h, and add copper in smelting process, and copper percentage composition is 0.2% of chemical composition batching total amount;
(4) molten steel smelted in step (3) is poured in ladle, calm 8min, between killing period, in ladle, add nodulizing agent carry out spheroidizing, after spheroidizing reacion terminates, on molten steel, the slag making of spreading perlite is to purify original iron melt and to skim at once, skim and add nucleating agent in backward ladle and carry out inoculation 10min, after inoculation terminates again on molten steel the slag making of spreading perlite to purify original iron melt and to skim at once;
The Chemical Composition of nucleating agent comprises by mass percentage: Si:75%, Al:0.5%, S:0.04%, O:0.05%, all the other be Fe and can not surface impurity, and add nucleating agent mass percentage be chemical composition batching total amount 0.8%;
(5) molten steel in step (4) after again skimming is left standstill 15min, be cast into end plate blank in the casting mold of then implantation step (1), the duration of pouring is 13min, and teeming temperature controls at 1200 DEG C;
(6) end plate blank is sent into process furnace and be heated to 1500 DEG C, then through the first refrigerating work procedure, end plate blank fast speed is cooled to 900 DEG C, then in quenching device, hardening liquid quenches, quenching 35s, then be heated to 1100 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
First refrigerating work procedure is adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 12 DEG C/s, end plate blank is chilled to 900 DEG C;
Second refrigerating work procedure adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 3 DEG C/s by end plate blank water-cooled to 850 DEG C, then air cooling to 450 DEG C, then adopt water-cooled with the rate of cooling of 6 DEG C/s by end plate blank water-cooled to room temperature;
(7) by end plate blank through shot blasting and mechanical workout, trimming, deburring, obtain this finished product of end plate, then carries out machining successively to end plate board finished product, specific as follows: processing endoporus, processing plane, punching, tapping, punching obtain end plate finished product;
(8) ultrasonic and magnetic nondestructive testing is carried out to the end plate finished product obtained, detect qualified being qualified end plate finished product and putting in storage.
embodiment 3
The present embodiment provides a kind of SPHC end plate for tube pile, and end plate comprises following component 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%, surplus is Fe and inevitable impurity.
The production technique of above-mentioned SPHC end plate for tube pile, this production technique concrete operation step is as follows:
(1) casting mold processed is mixed according to the actual size that will design end plate stand-by;
Mold material is 50/100-70/140 order silica sand mixture by mass percentage: 88%, sodium bentonite and calcium-base bentonite mixture: 10%, dextrin: 0.5% and water: 1.5 %;
(2) mo(U)ld face made to step (1) sprays a coating, and coating comprises following component by mass percentage: zirconium English powder: 92%, epoxy resin: 4%, wilkinite: 3% and titanium dioxide: 1%;
(3) medium-frequency induction furnace that above-mentioned chemical composition batching sends into acid lining is carried out smelting and obtain molten steel, smelting temperature is 1300 DEG C, smelts 5h, and add copper in smelting process, and copper percentage composition is 0.1% of chemical composition batching total amount;
(4) molten steel smelted in step (3) is poured in ladle, calm 5min, between killing period, in ladle, add nodulizing agent carry out spheroidizing, after spheroidizing reacion terminates, on molten steel, the slag making of spreading perlite is to purify original iron melt and to skim at once, skim and add nucleating agent in backward ladle and carry out inoculation 8min, after inoculation terminates again on molten steel the slag making of spreading perlite to purify original iron melt and to skim at once;
The Chemical Composition of nucleating agent comprises by mass percentage: Si:80%, Al:0.6%, S:0.06%, O:0.08%, all the other be Fe and can not surface impurity, and add nucleating agent mass percentage be chemical composition batching total amount 0.5%;
(5) molten steel in step (4) after again skimming is left standstill 12min, be cast into end plate blank in the casting mold of then implantation step (1), the duration of pouring is 10min, and teeming temperature controls at 1150 DEG C;
(6) end plate blank is sent into process furnace and be heated to 1350 DEG C, then through the first refrigerating work procedure, end plate blank fast speed is cooled to 950 DEG C, then in quenching device, hardening liquid quenches, quenching 30s, then be heated to 1050 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
First refrigerating work procedure is adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 10 DEG C/s, end plate blank is chilled to 950 DEG C;
Second refrigerating work procedure adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 2 DEG C/s by end plate blank water-cooled to 800 DEG C, then air cooling to 400 DEG C, then adopt water-cooled with the rate of cooling of 5 DEG C/s by end plate blank water-cooled to room temperature;
(7) by end plate blank through shot blasting and mechanical workout, trimming, deburring, obtain this finished product of end plate, then carries out machining successively to end plate board finished product, specific as follows: processing endoporus, processing plane, punching, tapping, punching obtain end plate finished product;
(8) ultrasonic and magnetic nondestructive testing is carried out to the end plate finished product obtained, detect qualified being qualified end plate finished product and putting in storage.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (7)
1. a SPHC end plate for tube pile, is characterized in that: described end plate comprises following component 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%, surplus is Fe and inevitable impurity.
2. SPHC end plate for tube pile according to claim 1, is characterized in that: described end plate comprises following component by mass percentage: C:0.17%, Si:0.60%, Mn:0.85%, S:0.0:25%, P:0.025%, Cu:0.:15 %, Cr:0.095%, Mo:0.30%, Nb:0.02%, V:0.055%, Ti:0.05%, surplus is Fe and inevitable impurity.
3. SPHC end plate for tube pile according to claim 1, is characterized in that: described end plate comprises following component 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%, surplus is Fe and inevitable impurity.
4. SPHC end plate for tube pile according to claim 1, is characterized in that: described end plate comprises following component 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%, surplus is Fe and inevitable impurity.
5. the production technique of SPHC end plate for tube pile according to claim 1, is characterized in that: this production technique concrete operation step is as follows:
(1) casting mold processed is mixed according to the actual size that will design end plate stand-by;
Described mold material is silica sand by mass percentage: 88%, wilkinite: 10%, additive: 0.5% and water: 1.5 %, described silica sand is mixed by 50/100-70/140 order silica sand, described wilkinite is sodium bentonite and calcium-base bentonite mixture, and described additive is α starch or dextrin;
(2) mo(U)ld face made to step (1) sprays a coating, and described coating comprises following component by mass percentage: zirconium English powder: 90-93%, epoxy resin: 2-4%, wilkinite: 1-3% and titanium dioxide: 0.5-1%, and above sum is 100%;
(3) above-mentioned chemical composition batching is carried out smelting and obtain molten steel, smelting temperature is 1250-1400 DEG C, smelts 4-6h, and add copper in smelting process, and described copper percentage composition is the 0.1-0.3% of described chemical composition batching total amount;
(4) molten steel smelted in step (3) is poured in ladle, calm 5-8min, between killing period, in ladle, add nodulizing agent carry out spheroidizing, after spheroidizing reacion terminates, on molten steel, the slag making of spreading perlite is to purify original iron melt and to skim at once, skim and add nucleating agent in backward ladle and carry out inoculation 8-10min, after inoculation terminates again on molten steel the slag making of spreading perlite to purify original iron melt and to skim at once;
(5) molten steel in step (4) after again skimming is left standstill 10-15min, be cast into end plate blank in the casting mold of then implantation step (1), the duration of pouring is 10-13min, and teeming temperature controls at 1100-1200 DEG C;
(6) end plate blank is sent into process furnace and be 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 device, hardening liquid quenches, quenching 30-35s, then be heated to 1000-1100 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
The first described refrigerating work procedure is adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 10-12 DEG C/s, end plate blank is chilled to 900-1000 DEG C;
The second described refrigerating work procedure adopts water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 2-3 DEG C/s by end plate blank water-cooled to 700-850 DEG C, then air cooling is to 400-450 DEG C, then adopt water-cooled with the rate of cooling of 3-6 DEG C/s by end plate blank water-cooled to room temperature;
(7) by end plate blank through shot blasting and mechanical workout, trimming, deburring, obtain this finished product of end plate, then carries out machining successively to end plate board finished product, specific as follows: processing endoporus, processing plane, punching, tapping, punching obtain end plate finished product;
(8) ultrasonic and magnetic nondestructive testing is carried out to the end plate finished product obtained, detect qualified being qualified end plate finished product and putting in storage.
6. the production technique of SPHC end plate for tube pile according to claim 5, is characterized in that: the medium-frequency induction furnace adopting acid lining when smelting Chemical Composition in described step (2).
7. the production technique of SPHC end plate for tube pile according to claim 5, it is characterized in that: the Chemical Composition of the nucleating agent added when carrying out inoculation in described step (4) comprises by mass percentage: Si:75-80%, Al:0.5-0.7%, S≤0.06%, O≤0.08%, all the other be Fe and can not surface impurity, and add nucleating agent mass percentage be described chemical composition batching total amount 0.5-0.8%.
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| CN103643125A (en) * | 2013-11-21 | 2014-03-19 | 江苏天舜金属材料集团有限公司 | Steel bar for prestress concrete, and production process thereof |
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