CN105195691A - Production process for horizontal continuous casting high-strength copper-clad steel bar for grounding project - Google Patents
Production process for horizontal continuous casting high-strength copper-clad steel bar for grounding project Download PDFInfo
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- CN105195691A CN105195691A CN201410301225.0A CN201410301225A CN105195691A CN 105195691 A CN105195691 A CN 105195691A CN 201410301225 A CN201410301225 A CN 201410301225A CN 105195691 A CN105195691 A CN 105195691A
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Abstract
The invention provides a production process for a horizontal continuous casting high-strength copper-clad steel bar for a grounding project and relates to the technical field of composite metal material production processes. The production process includes the steps of primary pretreatment, wherein a steel core is subjected to alkali washing for oil removing and then acid washing through industrial hydrochloric acid, and then is washed with clean water, and after cold draw, no cracking phenomenon or local necking phenomenon is generated on the surface of a rebar; straightening, wherein a steel core wire coil obtained after cold draw is placed in a horizontal continuous casting production line, and the straightening procedure is executed; secondary acid washing; secondary washing; mechanical polishing; drying treatment; electric furnace dip plating, wherein electric furnace dip plating is the core link of the horizontal continuous casting process, and the pulling speed and casting temperature are keys for affecting product quality and affecting continuous operation of production; crystallization and cooling; cold coiling take-up. The production process is free of pollution, low in cost, beneficial for large-scale production, high in automation degree and good in product performance.
Description
Technical field
The present invention relates to composite material technical field of producing, be specifically related to earth work horizontal casting high-strength copper covered steel rod production process.
Background technology
At present, the production technology of copper covered steel recombination line (rod) has the coated and or immersion of electricity Du ﹑, wherein, electroplating technology product layers of copper compare Bao ﹑ poorly conductive, pollute large in production process, and in this Gao of coating technology Cheng ﹑ complex process, particularly product, two metallic cohesions are poor, therefore, above-mentioned two kinds of techniques can not meet the high-quality requirement of green chemical industry and the product day by day improved.
Summary of the invention
The object of this invention is to provide earth work horizontal casting high-strength copper covered steel rod production process, it is pollution-free, and cost is low, is conducive to large-scale production, and automaticity is high, good product performance.
In order to solve the problem existing for background technology, the present invention is by the following technical solutions: it comprises following steps: 1, elementary pre-treatment: by steel core alkali cleaning oil removing, pickling is carried out afterwards with technical hydrochloric acid, the oxide-film that removing steel core surface generates, rinsing with clear water again, removing the acid solution because remaining in steel core surface after pickling;
2, cold drawn: because the size in electric induction furnace gate-in mold system aperture proposes requirement to steel core diameter, need before copper facing to carry out specifying the cold drawn of requirement to steel core, time cold drawn, adopt the method for proof stress or control cold-drawn rods; After cold drawn, rebar surface must not have crackle, or localized necking's phenomenon, needs to carry out cold bending test simultaneously, and after test, reinforcing bar must not have the phenomenon such as crackle, aliquation, for the high-intensity performance of final copper covered steel provides safeguard;
3, alignment: the steel core drum after cold drawn is put in people's horizontal casting production line, carries out alignment process;
4, white picking: be removing steel core surface grease, oxide-film or other residue more up hill and dale, carry out white picking with technique hydrochloric acid;
5, secondary washing: remove the residual acid solution after the pickling of steel core surface, carry out secondary flushing with clear water;
6, machine glazed finish: can form fine quality layers of copper because bright and clean steel core directly contacts with high-temperature copper liquid when immersion plating and not bring impurity into copper liquid in burner hearth, steel core need carry out machine glazed finish more thoroughly;
7, dry process: when particularly carrying out secondary cleaning in atmosphere, steel core surface can adsorption moisture, and enter because of in high temperature environments after burner hearth, water becomes steam, and is decomposed into hydrogen and oxygen, copper is oxidized and suction hydrogen;
8, electric furnace immersion plating: electric furnace immersion plating is the core link of horizontal continuous casting process, hauling speed and casting temperature are that can affect product quality and produce the key of continuous operation;
9, crystallization cooling: horizontal casting cooler crystallizer is the graphite jig that water cooling copper sleeve is housed;
10, cold rolling take-up: because hot rolling is apart from crystallizer closer distance rolling, line base temperature is higher, tensile strength is low, easy rolling, but the bad control of product quality, more easily occurs the quality problems such as face crack after rolling, and cold rolling is that line base is less than 200 degree Celsius, the position rolling far away apart from crystallizer, now the tensile strength of line base is comparatively large, and after rolling, product quality easily controls.
In present invention process, admission machine adopts tower-loop control, and admission machine and hauling machine pull open certain distance, when line base kink is greatly to when encountering the signaling switch of bottom, admission machine motor is accelerated.Along with the Accelerating running of admission machine, line base kink reduces gradually, when kink is little to a certain extent so that when the signaling switch on top encountered by line base, make admission machine decelerating through motor operate, admission machine is take-up at a slow speed.
During described electric furnace immersion plating, in the forming process because of copper covered steel electroforming, copper covered steel is the process of a cohesion crystallization and remelt in burner hearth, therefore stops in distraction procedure and the time length of drawing seems very important.When the time of staying of steel core in stove longer then steel core by the erosion of copper liquid surface melting, therefore steel core diminishes, and in stove, copper liquid purity reduces, and furnace life reduces.Otherwise the time stopped is short, then the cooling of copper liquid is fast, and poor product quality, easily produces rough surface, not sticky copper; Product surface is caused easily to occur crackle; In this technical process, the speed of traction is: 0.8m-1.2m/min (determining according to product specification), and traction time period of stay is 0.3-0.6 second, and design parameter value is determined by the factor such as Zhi Jing ﹑ copper liquid temperature of steel core.Inspiratory capacity due to melt increases with the rising of temperature, and the degasification of furnace charge declines by metal liquid self-temperature, and the minimizing of gas solubility in molten metal is got rid of.Therefore, reduction casting temperature can reduce the product defects that gas causes, but casting temperature is too low, molten metal poor fluidity, makes the layers of copper breach occurred during immersion plating not connect preferably or to eliminate.In this technical process, casting temperature controls at 1100 to 1180 degree Celsius.
In described crystallization cooling, due to the length of mould, larger on slab quality impact.Under the same cases such as steel core specification, casting temperature, hauling speed, crystallizing mould is long, and intensity of cooling is reduced, and degree of supercooling reduces, liquid cave deepen and easily crack, pore, the defect such as loose; Crystallizing mould is too short, and exit condensed layer is excessively thin, temperature is too high, radial temperature difference is large, easily produces the problem such as bleedout, hot tearing, causes production process wayward, adopts the length of crystallizer to be about 100 ㎝ in present invention process.In production process, because graphite crystallizer contacts with the various gases in high-temperature copper liquid for a long time, the carbonaceous of graphite jig is easily caused to be oxidized, its inner surface is made to occur pit, rough surface, increase frictional force, cause molten metal residual on mould, run up to certain degree and will affect crystallization, infringement copper covered steel coating surface quality, A level copper material is adopted in present invention process, electric induction furnace charge door is using the charcoal after screening as deoxidation covering, charcoal is good with smaller particle size, overburden cover is about 20 ㎝ (concrete how many fixed depending on copper liquid in burner hearth), thus the infringement reduced to graphite jig in crystallisation by cooling process, reduce production cost.
Operation principle of the present invention: through the electroforming process optimized, optimum optimization is carried out to links such as the steel core surface pre-treatment in electroforming process, steel core preheating, casting and post processings, realize hot dipping copper facing on steel wire base preferably, product copper layer thickness is 0.25 ㎜ to 3 ㎜, copper covered steel wire (rod) diameter is 3 ㎜ to 25 ㎜, copper and steel body surface realize metal metallurgy smelting and combine, really achieve the compound of two metal material performances, namely the high strength of steel is had, have again the anticorrosive of copper excellence and high conductivity concurrently, particularly there is good plasticity and weldability energy.
The present invention has following beneficial effect: it is pollution-free, and cost is low, is conducive to large-scale production, and automaticity is high, good product performance.
Detailed description of the invention:
This detailed description of the invention is by the following technical solutions: it comprises following steps: 1, elementary pre-treatment: by steel core alkali cleaning oil removing, pickling is carried out afterwards with technical hydrochloric acid, the oxide-film that removing steel core surface generates, then rinse with clear water, remove the acid solution because remaining in steel core surface after pickling;
2, cold drawn: because the size in electric induction furnace gate-in mold system aperture proposes requirement to steel core diameter, need before copper facing to carry out specifying the cold drawn of requirement to steel core, time cold drawn, adopt the method for proof stress or control cold-drawn rods; After cold drawn, rebar surface must not have crackle, or localized necking's phenomenon, needs to carry out cold bending test simultaneously, and after test, reinforcing bar must not have the phenomenon such as crackle, aliquation, for the high-intensity performance of final copper covered steel provides safeguard;
3, alignment: the steel core drum after cold drawn is put in people's horizontal casting production line, carries out alignment process;
4, white picking: be removing steel core surface grease, oxide-film or other residue more up hill and dale, carry out white picking with technique hydrochloric acid;
5, secondary washing: remove the residual acid solution after the pickling of steel core surface, carry out secondary flushing with clear water;
6, machine glazed finish: can form fine quality layers of copper because bright and clean steel core directly contacts with high-temperature copper liquid when immersion plating and not bring impurity into copper liquid in burner hearth, steel core need carry out machine glazed finish more thoroughly;
7, dry process: when particularly carrying out secondary cleaning in atmosphere, steel core surface can adsorption moisture, and enter because of in high temperature environments after burner hearth, water becomes steam, and is decomposed into hydrogen and oxygen, copper is oxidized and suction hydrogen; Because of the oxidation of copper, copper material oxygen content is raised, greatly reduce conduction and plasticity, the mobility of copper, and Hydrogen Energy is dissolved in liquid and In Crystal Solid Copper, its solubility reduces along with temperature and reduces, and then can separate out with hydrogen form at copper liquid protium in steel core surrounding set process, layers of copper then can form small crackle and pore, therefore, drying process first must be carried out before steel core carries out burner hearth immersion plating;
8, electric furnace immersion plating: electric furnace immersion plating is the core link of horizontal continuous casting process, hauling speed and casting temperature are that can affect product quality and produce the key of continuous operation;
9, crystallization cooling: horizontal casting cooler crystallizer is the graphite jig that water cooling copper sleeve is housed;
11, cold rolling take-up: because hot rolling is apart from crystallizer closer distance rolling, line base temperature is higher, tensile strength is low, easy rolling, but the bad control of product quality, more easily occurs the quality problems such as face crack after rolling, and cold rolling is that line base is less than 200 degree Celsius, the position rolling far away apart from crystallizer, now the tensile strength of line base is comparatively large, and after rolling, product quality easily controls.
In present invention process, admission machine adopts tower-loop control, and admission machine and hauling machine pull open certain distance, when line base kink is greatly to when encountering the signaling switch of bottom, admission machine motor is accelerated.Along with the Accelerating running of admission machine, line base kink reduces gradually, when kink is little to a certain extent so that when the signaling switch on top encountered by line base, make admission machine decelerating through motor operate, admission machine is take-up at a slow speed.
During described electric furnace immersion plating, in the forming process because of copper covered steel electroforming, copper covered steel is the process of a cohesion crystallization and remelt in burner hearth, therefore stops in distraction procedure and the time length of drawing seems very important.When the time of staying of steel core in stove longer then steel core by the erosion of copper liquid surface melting, therefore steel core diminishes, and in stove, copper liquid purity reduces, and furnace life reduces.Otherwise the time stopped is short, then the cooling of copper liquid is fast, and poor product quality, easily produces rough surface, not sticky copper; Product surface is caused easily to occur crackle.In this technical process, the speed of traction is: 0.8m-1.2m/min (determining according to product specification), and traction time period of stay is 0.3-0.6 second, and design parameter value is determined by the factor such as Zhi Jing ﹑ copper liquid temperature of steel core.Inspiratory capacity due to melt increases with the rising of temperature, and the degasification of furnace charge declines by metal liquid self-temperature, and the minimizing of gas solubility in molten metal is got rid of.Therefore, reduction casting temperature can reduce the product defects that gas causes, but casting temperature is too low, molten metal poor fluidity, makes the layers of copper breach occurred during immersion plating not connect preferably or to eliminate.In this technical process, casting temperature controls at 1100 to 1180 degree Celsius; In described crystallization cooling, due to the length of mould, larger on slab quality impact.Under the same cases such as steel core specification, casting temperature, hauling speed, crystallizing mould is long, and intensity of cooling is reduced, and degree of supercooling reduces, liquid cave deepen and easily crack, pore, the defect such as loose; Crystallizing mould is too short, and exit condensed layer is excessively thin, temperature is too high, radial temperature difference is large, easily produces the problem such as bleedout, hot tearing, causes production process wayward, adopts the length of crystallizer to be about 100 ㎝ in present invention process.In production process, because graphite crystallizer contacts with the various gases in high-temperature copper liquid for a long time, the carbonaceous of graphite jig is easily caused to be oxidized, its inner surface is made to occur pit, rough surface, increase frictional force, cause molten metal residual on mould, run up to certain degree and will affect crystallization, infringement copper covered steel coating surface quality, A level copper material is adopted in present invention process, electric induction furnace charge door is using the charcoal after screening as deoxidation covering, charcoal is good with smaller particle size, overburden cover is about 20 ㎝ (concrete how many fixed depending on copper liquid in burner hearth), thus the infringement reduced to graphite jig in crystallisation by cooling process, reduce production cost.
The electroforming process of this detailed description of the invention through optimizing, optimum optimization is carried out to links such as the steel core surface pre-treatment in electroforming process, steel core preheating, casting and post processings, realize hot dipping copper facing on steel wire base preferably, product copper layer thickness is 0.25 ㎜ to 3 ㎜, copper covered steel wire (rod) diameter is 3 ㎜ to 25 ㎜, copper and steel body surface realize metal metallurgy smelting and combine, really achieve the compound of two metal material performances, namely the high strength of steel is had, have again the anticorrosive of copper excellence and high conductivity concurrently, particularly there is good plasticity and weldability energy.
This detailed description of the invention is pollution-free, and cost is low, is conducive to large-scale production, and automaticity is high, good product performance.
。
Claims (1)
1. earth work horizontal casting high-strength copper covered steel rod production process, it is characterized in that it comprises following steps: (1), elementary pre-treatment: by steel core alkali cleaning oil removing, pickling is carried out afterwards with technical hydrochloric acid, the oxide-film that removing steel core surface generates, rinsing with clear water again, removing the acid solution because remaining in steel core surface after pickling;
(2), cold drawn: because the size in electric induction furnace gate-in mold system aperture proposes requirement to steel core diameter, to need before copper facing to carry out specifying the cold drawn of requirement to steel core, time cold drawn, adopt the method for proof stress or control cold-drawn rods; After cold drawn, rebar surface must not have crackle, or localized necking's phenomenon, needs to carry out cold bending test simultaneously, and after test, reinforcing bar must not have the phenomenon such as crackle, aliquation, for the high-intensity performance of final copper covered steel provides safeguard;
(3), alignment: the steel core drum after cold drawn is put in people's horizontal casting production line, carries out alignment process;
(4), white picking: be removing steel core surface grease, oxide-film or other residue more up hill and dale, carry out white picking with technique hydrochloric acid;
(5), secondary washing: remove the residual acid solution after the pickling of steel core surface, carry out secondary flushing with clear water;
(6), machine glazed finish: can form fine quality layers of copper because bright and clean steel core directly contacts with high-temperature copper liquid when immersion plating and not bring impurity into copper liquid in burner hearth, steel core need carry out machine glazed finish more thoroughly;
(7), dry process: when particularly carrying out secondary cleaning in atmosphere, steel core surface can adsorption moisture, and enter because of in high temperature environments after burner hearth, water becomes steam, and is decomposed into hydrogen and oxygen, copper is oxidized and suction hydrogen;
(8), electric furnace immersion plating: electric furnace immersion plating is the core link of horizontal continuous casting process, and hauling speed and casting temperature are that can affect product quality and produce the key of continuous operation;
(9), crystallization cooling: horizontal casting cooler crystallizer is the graphite jig that water cooling copper sleeve is housed;
(10), cold rolling take-up: cold rolling is line base less than 200 degree Celsius, the position rolling far away apart from crystallizer, and now the tensile strength of line base is comparatively large, and after rolling, product quality easily controls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410301225.0A CN105195691A (en) | 2014-06-30 | 2014-06-30 | Production process for horizontal continuous casting high-strength copper-clad steel bar for grounding project |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410301225.0A CN105195691A (en) | 2014-06-30 | 2014-06-30 | Production process for horizontal continuous casting high-strength copper-clad steel bar for grounding project |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906434A (en) * | 2017-02-28 | 2017-06-30 | 江苏金合益复合新材料有限公司 | Copper covers the production method of steel |
| CN109087753A (en) * | 2018-07-16 | 2018-12-25 | 南通汇丰电子科技有限公司 | A kind of production method of coaxial cable inner core wire Low ESR copper covered steel conductor |
| CN110994327A (en) * | 2019-12-19 | 2020-04-10 | 龙游龙辉电镀有限公司 | Production method and production equipment for ground rod |
-
2014
- 2014-06-30 CN CN201410301225.0A patent/CN105195691A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906434A (en) * | 2017-02-28 | 2017-06-30 | 江苏金合益复合新材料有限公司 | Copper covers the production method of steel |
| CN109087753A (en) * | 2018-07-16 | 2018-12-25 | 南通汇丰电子科技有限公司 | A kind of production method of coaxial cable inner core wire Low ESR copper covered steel conductor |
| CN110994327A (en) * | 2019-12-19 | 2020-04-10 | 龙游龙辉电镀有限公司 | Production method and production equipment for ground rod |
| CN110994327B (en) * | 2019-12-19 | 2021-06-15 | 龙游龙辉电镀有限公司 | Production method and production equipment for ground rod |
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Application publication date: 20151230 |