CN104928603A - Thermo-mechanical treatment process of great-length Cu-Cr-Zr-Si alloy contact line - Google Patents
Thermo-mechanical treatment process of great-length Cu-Cr-Zr-Si alloy contact line Download PDFInfo
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Abstract
The invention discloses a thermo-mechanical treatment process of a great-length Cu-Cr-Zr-Si alloy contact line. The process includes: smelting Cu-Cr-Zr-Si alloy, with Cu accounting for 0.30% to 0.50%, Cr accounting for 0.10% to 0.15% and Zr accounting for 0.01% to 0.02% in content, with a combined protective layer composed of mixed inert gas and a covering dried charcoal protective layer, in an induction furnace; and performing drag casting with a horizontal continuous casting system with electromagnetic stirring and a local heater to obtain rods 16 to 120mm in length. By high-frequency inductive thermal rolling, step heating and water-cooling solidification, cold rolling, split ageing and finish drawing or cold rolling, the alloy contact line having symmetrical grooves in two sides, 110 mm<2> to 150 mm<2> in sectional area and 1800 to 2000 m in singular length. The process has the advantages that metallurgical quality of products is high, and the performances meet the needs of various overhead line systems for modern high-speed railways and low-speed heavy duties.
Description
Technical field
The present invention relates to the thermo-mechanical processi production technique of osculatory, especially relate to the thermo-mechanical processi production technique of a kind of large length Cu-Cr-Zr-Si alloyed contact line being applied to high-speed electric railway power supply system.
Background technology
Applied to high-speed railway touching net system needs larger current capacity to ensure train high-speed cruising; Low-speed heave-load railway catenary system also needs larger current capacity to draw the car body of larger quality.Therefore, the growth requirement of high-performance contact system wire rod is very just urgent.
The effect of Prospect of Contact Wire Materials for Electrical Railway carries electric current by directly contacting with electric locomotive pantograph sliding plate sliding friction to electric locomotive, required conductor alloy will be operated under strong current, high tensile, thump, high temperature change, the impact of complex environment factor and slide plate the mal-condition such as frequently to wear away, therefore require that osculatory material must have higher tensile strength and specific conductivity, and have higher high temperature resistance softening power concurrently.Along with the high speed development of railway electrification, electric railway transport is raised speed again and again, more and more higher for osculatory performance requriements.But the intensity of conductor alloy and electroconductibility, generally in inverse function relation, namely improve intensity then often to sacrifice specific conductivity for cost according to particular technology, or then often sacrifice intensity for improving specific conductivity.Therefore, be starved of employing particular technology and can obtain good intensity and conductivity coupling level, to meet the use properties of high-speed railway osculatory alloy simultaneously.Especially for the high-speed electric train of more than speed per hour 350km, its tensile strength should reach more than 550MPa, and relative conductivity should higher than 75%IACS, and the intensity after 400 more than C softening annealing 2h still needs to remain on more than 90%.
In the conductor alloy that current high-speed electric train osculatory adopts, Cu-Cr-Zr system demonstration more outstanding intensity and specific conductivity matching relationship.But, in material preparation process, because Cr, Zr alloying element fusing point is significantly higher than Cu, and very easily oxidation contact with many materials and react under melted state, in addition the easy air-breathing of melt, segregation and impurity such as not easily to get rid of at the factor, cause material to prepare difficulty and actual performance is difficult to reach perfect match state.
Cu-Cr-Zr alloy high-strength highly-conductive osculatory adopts the multiple strengthening means such as precipitation strength, but precipitation strength type osculatory production technique is very complicated, very high to the requirement of production technique equipment, Alloy melting technology level, thermal treatment and blank quality.
Current maximally related Technological expression is in the world in some United States Patent (USP)s.US6679955 discloses the technology of preparing of Cu-(3 ~ 20) %Ag – (0.5 ~ 1.5) %Cr-(0.05 ~ 0.5) %Zr alloy, relies on rapid solidification to obtain supersaturated solid solution and hardens through heat treatment precipitation.US7172665 discloses the technology of preparing of Cu-(2 ~ 6) %Ag-(0.5 ~ 0.9) %Cr alloy, and technique comprises the complex processes such as Homogenization Treatments, thermal distortion and solution treatment.US6881281 provides a kind of high-strength highly-conductive Cu-(0.05 ~ 1.0) %Cr-(0.05 ~ 0.25) %Zr alloy, utilizes Zr and Cu-Zr compound particles to improve the grain-boundary strength of alloy at 250 ~ 550 C.US5210441 and US5341025 discloses a kind of circuit lead frame Cu-(0.1 ~ 1) %Cr-(0.01 ~ 0.5) %Zr alloy, is not suitable for the large length product of preparation and cannot be applied to batch production.US40677501 provides the complete processing improving Cu-(0.05 ~ 1.25) %Cr-(0.01 ~ 1.0) %Zr-(0.01 ~ 1.0) %V alloy strength and specific conductivity, hot rolling and solid solution is relied on to improve the solute solubility of Cu matrix, be convenient to follow-up distortion and ag(e)ing process produces effective strengthening effect, be only applicable to equally produce sheet material and be unsuitable for producing wire rod.US6767643 and US6093499 discloses the technology of preparing of Cu-(0.01 ~ 2.0) %Cr-(0.01 ~ 1.0) %Zr and Cu-(0.01 ~ 0.4) %Cr-(0.01 ~ 0.2) %Zr-(0.02 ~ 2.0) % Zn, still also to add Fe again depending on actual needs, Ti, Ni, Sn, In, Mn, P, Mg, Al, B, As, Cd, the auxiliary elements such as Co, Te, Ag and Hf, excessive or the more complicated of alloying element content scope, performance is difficult to control, and specific conductivity is also lower, only about 50%IACS.
Above-mentioned technology can obtain the wire rod of excellent effect.But prepared wire rod can not be applied to the contact line conducting wire of large length or be only applicable to prepare the section bar such as band or foil, some technology need have expensive Ag element and the auxiliary element combined action of complexity, cost is very high, moreover what these technology were focused on is raising heat-conductive characteristic and conductivity is poor, can not mass industrial production, the needs of Modern High-Speed electrification railway contact net can not be met.Must separately there is technical skill head it off.
Current domestic immediate technology is that patent ZL200810121203.0 discloses a kind of high-performance osculatory Cu-(0.30 ~ 0.50) %Cr-(0.10 ~ 0.15) %Zr-(0.01 ~ 0.02) %Si alloy preparation technology, by control solidi fication and rate of cooling, obtain the supersaturation matrix of tiny as-cast grain and secondary dendrite arm spacing, coordinate rolling, drawing deformation and annealing thermal treatment controlling distortion degree and heat treatment parameter, organically combine strain hardening effect and precipitation strengthening effect, at Simplified flowsheet, under equipment and the simple condition of comparison of ingredients, alloy is made to have excellent tensile strength, specific conductivity and high temperature resistance softening power, further research and development can be suitable for suitability for industrialized production.
Patent ZL200910097340.X is the production method developed further on patent ZL200810121203.0 basis.By techniques such as Continuous Up casting, extruding, thermal treatment, cold drawing and rollings, preparation nominal area is 110 ~ 150 mm
2osculatory, under the condition that Simplified flowsheet, equipment and alloying constituent are fairly simple, make single finished product contact line length can reach 1000 ~ 1500 m.But the subject matter that this technology exists is that the large length base bar quality stability in Continuous Up casting is difficult to control, metallurgical imperfection causes scrap rate high more, to become a useful person rate variance, casting coarse grain heredity grade in subsequent thermal processing is high, grievous injury product performance, be difficult to satisfy the demand, reduce further yield rate.The technology of more advanced science must be adopted.
Therefore, no matter at present if all there is obvious deficiency or needing the key issue of solution badly in International or National correlation technique, should invent to some extent, progress could meet the needs of modern science and technology and industrial level high speed development to some extent.
Summary of the invention
The object of the present invention is to provide a kind of thermo-mechanical processi production technique of large length Cu-Cr-Zr-Si alloyed contact line.Stirred and the horizontal casting of area heating installation by the non-vacuum melting under liquid level available protecting, additional Special electromagnetic; the process procedures such as disposable great-deformation hot-rolled system, cold deformation and thermomechanical thermal treatment; ensure that the stability of metallurgical quality on continuous length and low metallurgical imperfection occurrence rate, the large length Cu-Cr-Zr-Si alloy contact wire rod with good strength, high conductivity and high temperature resistance softening performance can be prepared.
Problem of the present invention realizes with following technical proposals:
Alloyed contact line component of the present invention by mass%, Cu-(0.30 ~ 0.60) %Cr-(0.10 ~ 0.15) %Zr-(0.01 ~ 0.02) %Si, it is characterized in that the step of its thermo-mechanical processi production technique is as follows:
(1) melting: carry out melting in induction melting furnace;
(2) horizontal casting: the liquation that melting completes be guided to holding furnace leave standstill after in horizontal casting system with 80 ~ 550mm/min speed draw casting diameter be 16 ~ 120mm alloy bar base;
(3) hot rolling and continuously extruded process: by alloy bar base in high-frequency induction device after preheating hot rolling or continuously extruded one-tenth diameter be the alloy bar material of 30 ~ 45mm;
(4) solution treatment: the alloy bar material obtained hot rolling is coiled and enter water cooling in < 10 s, water coolant efficiently radiates heat during water-cooled after two-step heating under inert mixed gas protection;
(5) cold rolling: to be alloy wire by rolling under the alloy bar material normal temperature after solution treatment, roll speed is 2 ~ 3m/min; Cold rolling pass deformation extent controls at > 6%, total deformation > 70%;
(6) ageing treatment: carry out two-stage ageing treatment under cold rolling rear alloy wire protection of inert gas;
(7) carrying out drawing to the single alloy wire of the Cu-Cr-Zr-Si of ageing treatment and be rolled into the sectional area that two sides has an asymmetrical grooves is 110 ~ 150 mm
2alloyed contact line, single alloy contact line length is 1800 ~ 2000 m.
Negative electrode Cu first should be placed in induction furnace by the smelting operation in described step (1), in stove, fill pure Ar to 30kPa squeeze row's furnace air, to pass into the pure N mixed gas formation rare gas element complete preservation layer that the pure Ar of 10 ~ 20ml/s flow adds 15 ~ 30ml/s flow after the ramp of 10 DEG C/min to material melts, cover the thick dry charcoal layer more protection of about 40mm at bath surface again and intercept the thermoradiation efficiency of melt, add Cu-Cr master alloy again, Cu-Zr master alloy and Cu-Si master alloy is added again after fusing, melt evenly leaves standstill 20min 1250 DEG C of induction stirring, whole process must control bath surface charcoal and the tectal tightness of mixed gas and stability.
Horizontal casting in described step (2) must carry out in the horizontal casting system being attached with induction stirring and area heating installation, induction stirring frequency is 20Hz ~ 60Hz, field supply is 30A ~ 100A, and induction stirring and area heating installation must ensure that melt is 1200 DEG C in crystallizer entrance local temperature.
The diameter obtained horizontal casting in described step (3) is greater than the alloy bar base car of 80mm except the thick surface imperfection layer of 10mm, is rolled into the alloy bar material that diameter is 30 ~ 45mm, the thick as-cast structure of formative dynamics recrystallization softening 550 ~ 950 DEG C of a time.
The alloy bar base that the diameter obtained horizontal casting in described step (3) is less than 30mm is the alloy bar material of 30 ~ 45mm at 550 DEG C of continuously extruded one-tenth diameters, with thinning microstructure.
Two-step heating in described step (4) is under protection of inert gas, be heated to 720 DEG C ~ 800 DEG C, and insulation 1h ~ 1.5h, reheats to 940 DEG C ~ 990 DEG C, insulation 20min ~ 600min.
Two-stage ageing treatment in described step (6), is heated to 300 DEG C ~ 350 DEG C, insulation 0.5h ~ 1h, and follow-up continuation of insurance temperature is heated to 350 DEG C ~ 500 DEG C, and insulation 1h ~ 4h is cooled to less than 100 DEG C and takes out wire rod.
The tensile strength of described Cu-Cr-Zr-Si alloyed contact line is 510 ~ 620MPa, and relative conductivity is 75 ~ 90%IACS; After 400 C softening annealing 2h, strength degradation is no more than 10%.
The beneficial effect that the present invention has:
1) charcoal, inert mixed gas, protection melting and horizontal casting can be adopted to manufacture blank pole technology, without the need to large-scale vacuum smelting furnace and hot cogging equipment in atmospheric environment.
2) adopt the horizontal continuous casting technology of additional Special electromagnetic stirring and crystallizer entrance end melt area heating installation, coordinate gross distortion rolling technique, effectively cause dynamic recrystallization effect refinement as-cast grain, improve product mechanical property and conductivity.
3) metallic element not containing costliness in alloy, composition of raw material is relatively simple.
4) the product tensile strength of inventing is greater than 500MPa, and specific conductivity is higher than 75%IACS, and after 400 C softening annealing 2h, strength degradation is no more than 10%, and high temperature resistance softening power is especially outstanding.Have transmission current capacity high, the significant advantage of energy conservation and consumption reduction effects, integrated performance index is higher than the contact line conducting wire of other type any of current practical engineering application.
5) technique and required equipment are relatively simple, are applicable to suitability for industrialized production, advantage of lower cost.
Alloy material composition of the present invention is simple, product metallurgical quality is higher, and properties can meet the demand of the various different contact system such as Modern High-Speed railway, low-speed heave-load, is easy to suitability for industrialized production.
Accompanying drawing explanation
The horizontal casting system schematic of M-EMS and area heating installation is attached with in Fig. 1 the present invention.
In figure: 1, holding furnace, 2, magnetic stirrer, 3, primary cooling zone, 4, secondary and three cooling zones
5, excellent base, 6, traction system, 7, graphite mo(u)ld.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
The horizontal casting system schematic being attached with M-EMS and area heating installation of the present invention, as shown in Figure 1, comprising: holding furnace 1, magnetic stirrer 2, primary cooling zone 3, secondary and three cooling zones 4,
Rod base 5, traction system 6 and graphite mo(u)ld 7.Holding furnace 1 side is connected with graphite mo(u)ld 7, and graphite mo(u)ld 7 cylindrical is outwards equipped with magnetic stirrer 2 and primary cooling zone 3 successively, and excellent base 5 cylindrical be positioned at outside graphite mo(u)ld 7 is outwards equipped with secondary and three cooling zones 4 and traction system 6 successively.
embodiment 1
Use raw material to be 99.96% cathode copper, Cu-Cr master alloy, Cu-Zr master alloy and Cu-Si master alloy press the content of alloying element for (quality %): Cu-0.30%Cr-0.10%Zr-0.01%Si preparation melting starting material.First negative electrode Cu should be placed in induction furnace in stove, fill pure Ar to the 30kPa as far as possible row's of squeezing furnace air, to material melts, pass into the ramp of about 10 DEG C/min the pure N that the pure Ar of 10ml/s flow adds 15ml/s flow
2mixed gas forms rare gas element complete preservation layer and covers the thick dry charcoal layer more protection of about 40mm at bath surface again and intercept the thermoradiation efficiency of melt.Add Cu-Cr master alloy again, add Cu-Zr and Cu-Si master alloy again after fusing, melt evenly leaves standstill 20min 1250 DEG C of induction stirring.Whole process strict must control bath surface charcoal and the tectal tightness of mixed gas and stability.
Molten alloyed copper is drawn casting with 80mm/min speed in the horizontal casting system being attached with M-EMS and area heating installation and obtains the excellent base that diameter is 120mm, induction stirring frequency is 20Hz, and field supply is 100A.To ensure that melt is 1200 DEG C in crystallizer entrance local temperature.
The excellent base high-frequency induction heating that above-mentioned steps obtains is preheated to 950 DEG C, then to be rolled into lower than the speed of 1500mm/min the bar that diameter is 30mm, forms sufficient dynamic recrystallization and destroys thick as-cast structure crystal grain thinning.Roll rear bar harvest diameter and be greater than coiling of 2m.
What alloy hot rolling obtained coils at pure N
2the lower employing of protection is heated to 800 DEG C of insulation 1h, and reheat to 990 DEG C, in < 10s, enter water cooling after insulation 20min, during water-cooled, water coolant carries out effective heat loss through convection.
To be 10mm wire rod through 4 passes diameters under the alloy bar material normal temperature after solution treatment, roll speed be 3m/min total deformation > 70%;
Down interrupted aging process is carried out in a vacuum furnace to cold rolling alloy wire, is first heated to 350 DEG C of insulation 1h follow-up continuation of insurance temperature 2h and is cooled to less than 100 DEG C and takes out wire rod.
Being drawn into the bar after timeliness the nominal area that cross section has an asymmetrical grooves is 100 mm
2osculatory.
The osculatory joint length prepared through above-mentioned technique can reach 2000 m, and tensile strength can reach 510MPa, and relative conductivity can reach 75%IACS.After 400 C softening annealing 2h, strength degradation is no more than 10%.
embodiment 2
Use raw material to be 99.96% cathode copper, Cu-Cr master alloy, Cu-Zr master alloy and Cu-Si master alloy preparation constituent content are the melting starting material of the osculatory of (quality %): Cu-0.60%Cr-0.15%Zr-0.02%Si.First negative electrode Cu is placed in induction furnace in stove, fills pure Ar to the 30kPa as far as possible row's of squeezing furnace air, to material melts, pass into the ramp of about 10 DEG C/min the pure Ar of 20ml/s flow adds 30ml/s flow pure N mixed gas and form rare gas element complete preservation layer and cover the thick dry charcoal layer more protection of about 40mm at bath surface again and intercept the thermoradiation efficiency of melt.Add Cu-Cr master alloy again, add Cu-Zr and Cu-Si master alloy again after fusing, melt evenly leaves standstill 20min 1250 DEG C of induction stirring.Whole process strict must control bath surface charcoal and the tectal tightness of mixed gas and stability.
Molten alloyed copper is drawn casting with 550mm/min speed in the horizontal casting system being attached with M-EMS and area heating installation and obtains the excellent base that diameter is 115mm, induction stirring frequency is 60Hz, and field supply is 30A.To ensure that melt is 1200 DEG C in crystallizer entrance local temperature.
The excellent base high-frequency induction heating that above-mentioned steps obtains is preheated to 800 DEG C, then to be rolled into lower than the speed of 1500mm/min the bar that diameter is 35mm, forms sufficient dynamic recrystallization and destroys thick as-cast structure crystal grain thinning.Roll rear bar harvest diameter and be greater than coiling of 2m.
What alloy hot rolling obtained coils at pure N
2the lower employing of protection is heated to 720 DEG C of insulation 1.5h, and reheat to 950 DEG C, in < 10s, enter water cooling after insulation 60min, during water-cooled, water coolant carries out effective heat loss through convection.
To be 15mm wire rod through 6 passes diameters under the alloy bar material normal temperature after solution treatment, roll speed be 2m/min total deformation > 70%;
Down interrupted aging process is carried out in a vacuum furnace to cold rolling alloy wire, reheats after being first heated to 300 DEG C of insulation 0.5h to 550 DEG C of insulation 4h and be cooled to less than 100 DEG C and take out wire rod.
Being drawn into the bar after timeliness the nominal area that cross section has an asymmetrical grooves is 150 mm
2osculatory.
The osculatory joint length prepared through above-mentioned technique can reach 1800 m, and tensile strength can reach 620MPa, and relative conductivity can reach 90%IACS.After 400 C softening annealing 2h, strength degradation is no more than 10%.
embodiment 3
Use raw material to be 99.96% cathode copper, Cu-Cr master alloy, Cu-Zr master alloy and Cu-Si master alloy preparation constituent content are the melting starting material of the osculatory of (quality %): Cu-0.50%Cr-0.12%Zr-0.02%Si.First negative electrode Cu is placed in induction furnace; first negative electrode Cu is placed in induction furnace in stove, fills pure Ar to the 30kPa as far as possible row's of squeezing furnace air, to material melts, pass into the ramp of about 10 DEG C/min the pure Ar of 15ml/s flow adds 20ml/s flow pure N mixed gas and form rare gas element complete preservation layer and cover the thick dry charcoal layer more protection of about 40mm at bath surface again and intercept the thermoradiation efficiency of melt.Add Cu-Cr master alloy again, add Cu-Zr and Cu-Si master alloy again after fusing, melt evenly leaves standstill 20min 1250 DEG C of induction stirring.Whole process strict must control bath surface charcoal and the tectal tightness of mixed gas and stability.
Molten alloyed copper is drawn casting with 350mm/min speed in the horizontal casting system being attached with induction stirring and crystallizer end area heating installation and obtains the excellent base that diameter is 100mm, induction stirring frequency is 30Hz, and field supply is 70A.To ensure that melt is 1200 DEG C in crystallizer entrance local temperature.
The excellent base high-frequency induction heating that above-mentioned steps obtains is preheated to 900 DEG C, then to be rolled into lower than the speed of 1500mm/min the bar that diameter is 45mm, forms sufficient dynamic recrystallization and destroys thick as-cast structure crystal grain thinning.Roll rear bar harvest diameter and be greater than coiling of 2m.
What alloy hot rolling obtained coils at pure N
2the lower employing of protection is heated to 760 DEG C of insulation 1.5h, and reheat to 940 DEG C, in < 10s, enter water cooling after insulation 50min, during water-cooled, water coolant carries out effective heat loss through convection.
To be 15mm wire rod through 5 passes diameters under the alloy bar material normal temperature after solution treatment, roll speed be 2.4m/min total deformation > 70%;
Down interrupted aging process is carried out in a vacuum furnace to cold rolling alloy wire, reheats after being first heated to 320 DEG C of insulation 0.8h to 520 DEG C of insulation 3h and be cooled to less than 100 DEG C and take out wire rod.
Being drawn into the bar after timeliness the nominal area that cross section has an asymmetrical grooves is 150 mm
2osculatory.
The osculatory joint length prepared through above-mentioned technique can reach 2000 m, and tensile strength can reach 550MPa, and relative conductivity can reach 82%IACS.After 400 C softening annealing 2h, strength degradation is no more than 10%.
embodiment 4
Use raw material to be 99.96% cathode copper, Cu-Cr master alloy, Cu-Zr master alloy and Cu-Si master alloy preparation constituent content are the melting starting material of the osculatory of (quality %): Cu-0.55%Cr-0.14%Zr-0.02%Si.First negative electrode Cu is placed in induction furnace in stove, fills pure Ar to the 30kPa as far as possible row's of squeezing furnace air, to material melts, pass into the ramp of about 10 DEG C/min the pure Ar of 18ml/s flow adds 25ml/s flow pure N mixed gas and form rare gas element complete preservation layer and cover the thick dry charcoal layer more protection of about 40mm at bath surface again and intercept the thermoradiation efficiency of melt.Add Cu-Cr master alloy again, add Cu-Zr and Cu-Si master alloy again after fusing, melt evenly leaves standstill 20min 1250 DEG C of induction stirring.Whole process strict must control bath surface charcoal and the tectal tightness of mixed gas and stability.
Molten alloyed copper is drawn casting with 350mm/min speed in the horizontal casting system being attached with M-EMS and area heating installation and obtains the excellent base that diameter is 16mm, induction stirring frequency is 30Hz, and field supply is 70A.To ensure that melt is 1200 DEG C in crystallizer entrance local temperature.
The diameter obtained horizontal casting is the bar that the excellent base of 16mm is 30mm with the speed lower than 1500mm/min at 550 DEG C of continuously extruded one-tenth diameters, destroys thick as-cast structure crystal grain thinning.Harvest diameter is greater than coiling of 2m.
What alloy hot rolling obtained coils at pure N
2the lower employing of protection is heated to 760 DEG C of insulation 1.5h, and reheat to 940 DEG C, in < 10s, enter water cooling after insulation 50min, during water-cooled, water coolant carries out effective heat loss through convection.
To be 12mm wire rod through 4 passes diameters under the alloy bar material normal temperature after solution treatment, roll speed be 2.4m/min total deformation > 70%;
Down interrupted aging process is carried out in a vacuum furnace to cold rolling alloy wire, reheats after being first heated to 320 DEG C of insulation 0.6h to 500 DEG C of insulation 3h and be cooled to less than 100 DEG C and take out wire rod.
Being rolled into the bar after timeliness the nominal area that cross section has an asymmetrical grooves is 120 mm
2osculatory.
The osculatory joint length prepared through above-mentioned technique can reach 2000 m, and tensile strength can reach 580MPa, and relative conductivity can reach 82%IACS.After 400 C softening annealing 2h, strength degradation is no more than 10%.
embodiment 5
Use raw material to be 99.96% cathode copper, Cu-Cr master alloy, Cu-Zr master alloy and Cu-Si master alloy preparation constituent content are the melting starting material of the osculatory of (quality %): Cu-0.45%Cr-0.15%Zr-0.02%Si.First negative electrode Cu is placed in induction furnace in stove, fills pure Ar to the 30kPa as far as possible row's of squeezing furnace air, to material melts, pass into the ramp of about 10 DEG C/min the pure Ar of 16ml/s flow adds 16ml/s flow pure N mixed gas and form rare gas element complete preservation layer and cover the thick dry charcoal layer more protection of about 40mm at bath surface again and intercept the thermoradiation efficiency of melt.Add Cu-Cr master alloy again, add Cu-Zr and Cu-Si master alloy again after fusing, melt evenly leaves standstill 20min 1250 DEG C of induction stirring.Whole process strict must control bath surface charcoal and the tectal tightness of mixed gas and stability.
Molten alloyed copper is drawn casting with 350mm/min speed in the horizontal casting system being attached with induction stirring and crystallizer area heating installation and obtains the excellent base that diameter is 22mm, induction stirring frequency is 30Hz, and field supply is 70A.To ensure that melt is 1200 DEG C in crystallizer entrance local temperature.
The bar that the excellent base obtained horizontal casting is 40mm with the speed lower than 1500mm/min at 550 DEG C of continuously extruded one-tenth diameters, crystal grain thinning.Harvest diameter is greater than coiling of 2m.
What alloy hot rolling obtained coils at pure N
2the lower employing of protection is heated to 750 DEG C of insulation 1.5h, and reheat to 970 DEG C, in < 10s, enter water cooling after insulation 50min, during water-cooled, water coolant carries out effective heat loss through convection.
To be 15mm wire rod through 5 passes diameters under the alloy bar material normal temperature after solution treatment, roll speed be 2.4m/min total deformation > 70%;
Down interrupted aging process is carried out in a vacuum furnace to cold rolling alloy wire, reheats after being first heated to 320 DEG C of insulation 0.5h to 500 DEG C of insulation 1h and be cooled to less than 100 DEG C and take out wire rod.
Being rolled into the bar after timeliness the nominal area that cross section has an asymmetrical grooves is 150 mm
2osculatory.
The osculatory joint length prepared through above-mentioned technique can reach 1900 m, and tensile strength can reach 540MPa, and relative conductivity can reach 87%IACS.After 400 C softening annealing 2h, strength degradation is no more than 10%.
Claims (8)
1. the thermo-mechanical processi production technique of a large length Cu-Cr-Zr-Si alloyed contact line, this alloyed contact line component by mass%, Cu-(0.30 ~ 0.60) %Cr-(0.10 ~ 0.15) %Zr-(0.01 ~ 0.02) %Si, it is characterized in that the step of its thermo-mechanical processi production technique is as follows:
(1) melting: carry out melting in induction melting furnace;
(2) horizontal casting: the liquation that melting completes be guided to holding furnace leave standstill after in horizontal casting system with 80 ~ 550mm/min speed draw casting diameter be 16 ~ 120mm alloy bar base;
(3) hot rolling and continuously extruded process: by alloy bar base in high-frequency induction device after preheating hot rolling or continuously extruded one-tenth diameter be the alloy bar material of 30 ~ 45mm;
(4) solution treatment: the alloy bar material obtained hot rolling is coiled and enter water cooling in < 10 s, water coolant efficiently radiates heat during water-cooled after two-step heating under inert mixed gas protection;
(5) cold rolling: to be alloy wire by rolling under the alloy bar material normal temperature after solution treatment, roll speed is 2 ~ 3m/min; Cold rolling pass deformation extent controls at > 6%, total deformation > 70%;
(6) ageing treatment: carry out two-stage ageing treatment under cold rolling rear alloy wire protection of inert gas;
(7) carrying out drawing to the single alloy wire of the Cu-Cr-Zr-Si of ageing treatment and be rolled into the sectional area that two sides has an asymmetrical grooves is 110 ~ 150 mm
2alloyed contact line, single alloy contact line length is 1800 ~ 2000 m.
2. the thermo-mechanical processi production technique of a kind of large length Cu-Cr-Zr-Si alloyed contact line according to claim 1, it is characterized in that: negative electrode Cu first should be placed in induction furnace by the smelting operation in described step (1), in stove, fill pure Ar to 30kPa squeeze row's furnace air, to pass into the pure N mixed gas formation rare gas element complete preservation layer that the pure Ar of 10 ~ 20ml/s flow adds 15 ~ 30ml/s flow after the ramp of 10 DEG C/min to material melts, cover the thick dry charcoal layer more protection of about 40mm at bath surface again and intercept the thermoradiation efficiency of melt, add Cu-Cr master alloy again, Cu-Zr master alloy and Cu-Si master alloy is added again after fusing, melt evenly leaves standstill 20min 1250 DEG C of induction stirring, whole process must control bath surface charcoal and the tectal tightness of mixed gas and stability.
3. the thermo-mechanical processi production technique of a kind of large length Cu-Cr-Zr-Si alloyed contact line according to claim 1, it is characterized in that: the horizontal casting in described step (2) must carry out in the horizontal casting system being attached with induction stirring and area heating installation, induction stirring frequency is 20Hz ~ 60Hz, field supply is 30A ~ 100A, and induction stirring and area heating installation must ensure that melt is 1200 DEG C in crystallizer entrance local temperature.
4. the thermo-mechanical processi production technique of a kind of large length Cu-Cr-Zr-Si alloyed contact line according to claim 1, it is characterized in that: the diameter obtained horizontal casting in described step (3) is greater than the alloy bar base car of 80mm except the thick surface imperfection layer of 10mm, the alloy bar material that diameter is 30 ~ 45mm is rolled into, the thick as-cast structure of formative dynamics recrystallization softening 550 ~ 950 DEG C of a time.
5. the thermo-mechanical processi production technique of a kind of large length Cu-Cr-Zr-Si alloyed contact line according to claim 1, it is characterized in that: the alloy bar base that the diameter obtained horizontal casting in described step (3) is less than 30mm is the alloy bar material of 30 ~ 45mm at 550 DEG C of continuously extruded one-tenth diameters, with thinning microstructure.
6. the thermo-mechanical processi production technique of a kind of large length Cu-Cr-Zr-Si alloyed contact line according to claim 1; it is characterized in that: the two-step heating in described step (4); under protection of inert gas, be heated to 720 DEG C ~ 800 DEG C; insulation 1h ~ 1.5h; reheat to 940 DEG C ~ 990 DEG C, insulation 20min ~ 600min.
7. the thermo-mechanical processi production technique of a kind of large length Cu-Cr-Zr-Si alloyed contact line according to claim 1, it is characterized in that: the two-stage ageing treatment in described step (6), be heated to 300 DEG C ~ 350 DEG C, insulation 0.5h ~ 1h, follow-up continuation of insurance temperature is heated to 350 DEG C ~ 500 DEG C, and insulation 1h ~ 4h is cooled to less than 100 DEG C and takes out wire rod.
8. the thermo-mechanical processi production technique of a kind of large length Cu-Cr-Zr-Si alloyed contact line according to claim 1, is characterized in that: the tensile strength of described Cu-Cr-Zr-Si alloyed contact line is 510 ~ 620MPa, and relative conductivity is 75 ~ 90%IACS; After 400 C softening annealing 2h, strength degradation is no more than 10%.
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| CN106756212A (en) * | 2017-01-09 | 2017-05-31 | 上海理工大学 | The method that continuous casting even squeezes production precipitation strength type high-strength copper evanohm |
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| CN108467966A (en) * | 2018-03-22 | 2018-08-31 | 江西理工大学 | A kind of Cu alloy material and preparation method thereof |
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Address after: 264670 No. three, No. 27, latitude road, hi tech Zone, Shandong, Yantai Applicant after: Yantai Jinhui Copper Co., Ltd. Applicant after: Xingtai Xinhui Copper Industry Special Wire Material Co., Ltd. Applicant after: Zhejiang University Address before: 264670 No. three, No. 27, latitude road, hi tech Zone, Shandong, Zaozhuang Applicant before: Yantai Jinhui Copper Co., Ltd. Applicant before: Xingtai Xinhui Copper Industry Special Wire Material Co., Ltd. Applicant before: Zhejiang University |
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