CN103469061A - Ultra-low carbon steel wire rod for electric conduction and production method thereof - Google Patents
Ultra-low carbon steel wire rod for electric conduction and production method thereof Download PDFInfo
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- CN103469061A CN103469061A CN201310401021XA CN201310401021A CN103469061A CN 103469061 A CN103469061 A CN 103469061A CN 201310401021X A CN201310401021X A CN 201310401021XA CN 201310401021 A CN201310401021 A CN 201310401021A CN 103469061 A CN103469061 A CN 103469061A
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Abstract
The invention provides an ultra-low carbon steel wire rod for electric conduction and a production method thereof. The ultra-low carbon steel wire rod for electric conduction comprises the following chemical compositions: 0.002-0.005% of C, 0.004-0.010% of Si, 0.05-0.15% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.0050-0.0080% of total oxygen, and less than or equal to 0.0050% of total aluminum. The carbon content of smelted steel tapped from a converter is less than or equal to 0.040%, and the oxygen content of molten steel is 0.060-0.070%; natural decarburization is performed for 5-8 minutes in the first stage of RH refining; in the second stage of RH refining, after the carbon content is reduced to below 0.0030%, oxygen blowing is performed for 15-20 minutes, and a low-carbon or carbon-free steel ladle is adopted for smelting; the superheat degree of molten steel of a continuous casting tundish is less than or equal to 30 DEG C, the electromagnetic stirring current is greater than or equal to 400A, and the pulling rate is 0.5-0.7 m/min; the temperature of an entry double-module is 880-900 DEG C, the spinning temperature is 900-920 DEG C, the roller-bed speed is 0.2-0.4 m/s, and fans are completely closed. The electric conductivity of the wire rod disclosed by the invention is greater than or equal to 15%, the tensile strength is less than or equal to 300 MPa, and the area reduction index is greater than or equal to 80%, and the wire rod can partially replace copper conducting materials, thereby reducing the production cost.
Description
Technical field
The invention belongs to metallurgical technology field, relate in particular to ultra low carbon steel wire rod steel and production method thereof for a kind of conduction.
Background technology
Along with the fast development of national economy, requirement and the consumption of electro-conductive material improved constantly.Traditional copper conductive material good conductivity, but cost is high, limits its widespread use.The electroconductibility of steel increases along with the minimizing of Impurities in steel, and the low-carbon (LC) of ultra low-carbon steel, low silicon content are laid a good foundation for the electroconductibility that improves steel.Make the conduction steel wire by the ultra low-carbon steel conduction with wire rod, the Partial Replacement copper conductive material, reduce production costs, and has huge market application foreground.
Number of patent application 200910117766.7 discloses a kind of production method of copper-clad steel double-metal wire, by the steel core alignment, and rust cleaning, decontamination and mechanical polishing; By the electrolytic copper heat fused, to the steel core heating, carry out horizontal casting coated copper layer; Copper sheathed steel is heated, carries out quick solid solution treatment; By the drawing of producing steel-in-copper wires continuous several times, make the product diameter reach 4mm--26mm; By the annealing of the producing steel-in-copper wires of drawing, die drawn is that required specification finished product gets final product.
Patent publication No. CN02203241.X provides a kind of compound (1) silk thread of metallic cover, and it is that the plating thickening layer that vacuum sputtering layer periphery coats, comply with layer according to order from inside to outside and coat setting by core, the peripheral vacuum sputtering layer coated of core.
Disclosed a kind of copper alloy contact wire and the preparation method with excellent comprehensive performance of number of patent application 200610048186.3, belong to the cable technology field, for improving the use properties of osculatory.Its technical scheme is: it take copper alloy as raw material, and described copper alloy is formed by the raw material melting of magnesium 0.05-0.35%, tin 0.35-0.05%.
200820047909.2 1 kinds of NEW TYPE OF COMPOSITE metallic substance of number of patent application, be applicable to the conducting connecting part of electric (device) industry, the two sides outside surface of the composite material be integrated at copper sheet layer and soft steel sheet layer is electroplate with respectively layer of metal nickel electrolytic coating.
Patent publication No. CN97100471.4 provides a kind of quick acidic bright copper-plating technique for low-carbon steel wire, belongs to the method invention of technical field of electrochemistry.The invention provides electroplating technology and formula.Wherein to take copper sulfate, sulfuric acid, sodium lauryl sulphate, phenol sulfonic acid be main component to the formula of copper electroplating solution.
Above-mentioned patent 1-4 is all metallic conduction materials relevant to copper or copper alloy, and patent 5 is Mild Steel Wire bright copper plating technique, belongs to technical field of electrochemistry.Existing low-carbon steel rod bundle C≤0.010%, electric conductivity only can reach 6-8%, ultra low carbon steel wire rod C≤0.005%, electric conductivity also only can reach 10-12%, can't meet the requirement that part substitutes the copper conductive material of electric conductivity >=15%.
Novel conductive of the present invention is controlled converter tapping carbon, oxygen level with ultra low carbon steel wire rod by Composition Design employing, RH vacuum refinement decarburization, desiliconization after stove, improve refining process molten steel oxygen activity, utilize the oxygen activity that molten steel is higher, reduce molten steel aluminium content, reduce the effect of its crystal grain thinning, increase grain-size, improve the wire rod electric conductivity.
Summary of the invention
The present invention aims to provide a kind ofly has higher conductivity, but the Partial Replacement copper conductive material, thus ultra low carbon steel wire rod and production method thereof for the conduction reduced production costs.
For this reason, the solution that the present invention takes is:
A kind of conduction ultra low carbon steel wire rod, its chemical composition wt% content is: C 0.002%～0.005%, Si 0.004%～0.010%, Mn 0.05%～0.15%, P≤0.015%, S≤0.010%, total oxygen: 0.0050%～0.0080%, full aluminium≤0.0050%, all the other are iron and not higher than 0.1% impurity.
A kind of production method of using ultra low carbon steel wire rod of conducting electricity, its concrete grammar is:
1, control Oxygen Content in Liquid Steel and lower carbon content before the RH refining, converter smelting tapping carbon content control is≤0.040%, and Oxygen Content in Liquid Steel is controlled at 0.060%-0.070%;
2, the RH refining divides two stages: the first stage is taked nature decarburization mode, forbids heating up and forcing decarburization, and the time is 5-8 min; Subordinate phase is supplemented oxygen level in molten steel, utilizes oxygen gun blowing, and Control for Oxygen Content is at 0.030%-0.050%, improve carbon, oxygen speed of reaction, carbon content is dropped to below 0.0030%, oxygen blow duration 15-20 min, and temperature is adjusted to pouring temperature, and adopt low-carbon (LC) or carbon-free ladle to smelt;
3, continuous casting: adopt the bloom protective casting, steel billet cross dimensions 280 * 380mm, Metal in Tundish superheating temperature≤30 ℃, induction stirring electric current >=400A, pulling rate is between 0.5-0.7m/min;
4, rod rolling: enter the Dual module temperature and be controlled at 880-900 ℃, laying temperature 900-920 ℃, roller table speed 0.2-0.4m/s, the blower fan Close All, stay-warm case is closed, and guarantees that wire rod obtains the interior tissue of low strength, large grain-size under lower cooling rate.
Basic Mechanism and reason that composition range of the present invention is set are:
Carbon forms interstitial solid solution with iron in steel, contributes to improve the intensity of steel.But the angle required from the wire rod conductivity, require low as far as possible.Therefore carbon is controlled to 0.002%～0.005%.
The most of solid solution of silicon, in ferrite, can improve the intensity of steel, has desoxydatoin simultaneously, can eliminate FeO and be mingled with the detrimentally affect to the quality of steel.From wire rod conductivity angle, silicone content requires low as far as possible.Therefore silicon is controlled to 0.004%～0.010%.
Manganese has good desoxydatoin, can remove the FeO in steel, greatly improves the quality of steel, particularly reduces the fragility of steel, and manganese can form MnS with sulphur, to eliminate the deleterious effect of sulphur, improves the processing characteristics of steel, so must guarantee certain manganese content in steel.Manganese also has the effect of solution strengthening simultaneously.From wire rod conductivity angle, be controlled manganese, so manganese to be controlled at 0.05%～0.15%.
Phosphorus, sulphur are all detrimental impurity elements in steel, and phosphorus can be separated out the Fe that fragility is very large in steel
3p, make steel at room temperature intensity improve, fragility increases, and increases the cold shortness of steel, phosphorus easily segregation and be difficult to eliminate in the crystallisation process of steel simultaneously.Sulphur dissolves hardly in iron, and forms FeS with iron, and FeS and Fe form the eutectic of low melting point, when hot-work, because the eutectic that is distributed in crystal boundary easily melts, cause cracking, increase the red brittleness of steel.Because the conductivity of wire rod increases along with the minimizing of Impurities in steel, there is good conductivity for guaranteeing wire rod, require [P]≤0.015% in steel, [S]≤0.010% is more low better.
Aluminium is generally used for deoxidation in steel, reduces the total oxygen content of steel, has the effect of crystal grain thinning simultaneously, be mainly to form because aluminium neutralizes other element at steel the effect that infusible compound that small and dispersed distributes plays inhibiting grain growth, and be mainly the impact of AlN.Tiny crystal grain is unfavorable for the electric conductivity of wire rod, therefore will reduce Holo-Al content in steel; Therefore this patent the Holo-Al content in steel is controlled at≤0.0050%.
Total oxygen content in steel represents the cleanliness factor of steel, the oxygen level increase can make intensity, the Plasticity Decreasing of steel, but too low total oxygen content needs the strong deoxidation of aluminium deoxidizer, make molten steel aluminium content higher, thereby make wire rod aluminium content also higher, its grain refining effect is remarkable, improves wire rod intensity, reduces the conductivity of wire rod.Therefore will keep certain oxygen level in wire rod, total oxygen content is controlled at 0.0050%～0.0080%.
Beneficial effect of the present invention is:
The present invention can be controlled at 20-40um by the grain-size of low-carbon steel rod bundle, electric conductivity >=15%, tensile strength≤300MPa, reduction of area index >=80%, make the conduction steel wire by low-carbon steel rod bundle of the present invention, but the Partial Replacement copper conductive material, reduce production costs, meet user's service requirements fully.
Embodiment
The present invention is conducted electricity and with ultra low carbon steel wire rod chemical composition wt% content is: C 0.002%～0.005%, Si 0.004%～0.010%, Mn 0.05%～0.15%, P≤0.015%, S≤0.010%, total oxygen: 0.0050%～0.0080%, full aluminium≤0.0050%, all the other are iron and unavoidably but not higher than 0.1% impurity.
Conduction by the production method of ultra low carbon steel wire rod is: converter smelting tapping carbon content control is≤0.040%, and Oxygen Content in Liquid Steel is controlled at 0.060%-0.070%.2) the RH refining divides two stages: the first stage is taked nature decarburization mode, forbids heating up and forcing decarburization, and the time is approximately 5-8min; Subordinate phase must be supplemented oxygen content in steel, utilizes oxygen gun blowing, and Oxygen Content in Liquid Steel is controlled at 0.030%-0.050%, improves carbon, oxygen speed of reaction, and carbon content is dropped to below 0.0030%, needs 15-20 min, and temperature is adjusted to the requirement connected while watering.For preventing that ladle carburetting from adopting low-carbon (LC) or carbon-free ladle to smelt.3) continuous casting square billet specification 280 * 380mm, 25 ℃-30 ℃ of Metal in Tundish superheating temperature, induction stirring electric current 400-450A, pulling rate 0.5-0.7m/min; 4) rod rolling enters 880 ℃-900 ℃ of Dual module temperature, 900 ℃-920 ℃ of laying temperatures, roller table speed 0.25-0.40m/s, blower fan, stay-warm case Close All, guarantee that wire rod obtains low strength under lower cooling rate, large grain-size, to obtain high specific conductivity.
Below, the rolling diameter of phi 5.5mm wire rod of take is example, the invention will be further described.
Embodiment wire rod chemical composition wt% content is as shown in table 1:
Table 1 embodiment wire rod chemical composition wt% is containing scale
| Embodiment | C | Si | Mn | P | S | O | Al |
| 1 | 0.0040 | 0.005 | 0.081 | 0.008 | 0.009 | 0.0076 | 0.0046 |
| 2 | 0.0045 | 0.007 | 0.110 | 0.010 | 0.008 | 0.0069 | 0.0041 |
| 3 | 0.0042 | 0.006 | 0.091 | 0.009 | 0.006 | 0.0072 | 0.0038 |
| 4 | 0.0039 | 0.007 | 0.101 | 0.011 | 0.007 | 0.0068 | 0.0045 |
Embodiment smelting, continuous casting and Rolling Production processing parameter are as table 2:
Table 2 embodiment smelts, the continuous casting production process parameter list
Embodiment Rolling Production processing parameter is as table 3:
Table 3 embodiment Rolling Production process parameter table
| Embodiment | Enter Dual module temperature ℃ | Laying temperature ℃ | Roller table speed m/s | Blower fan, stay-warm case |
| 1 | 892 | 915 | 0.25 | Close |
| 2 | 884 | 908 | 0.25 | Close |
| 3 | 894 | 912 | 0.25 | Close |
| 4 | 885 | 906 | 0.25 | Close |
The embodiment wire rod rolls rear grain-size and service check result as table 4:
Table 4 embodiment wire rod rolls rear grain-size and service check table as a result
| Embodiment | Grain-size um | Tensile strength MPa | Reduction of area % | Electric conductivity % |
| 1 | 20-40 | 278 | 85 | 15.5 |
| 2 | 20-40 | 286 | 84 | 15.3 |
| 3 | 20-40 | 292 | 83 | 15.2 |
| 4 | 20-40 | 282 | 84 | 15.4 |
Claims (2)
1. a conduction ultra low carbon steel wire rod, it is characterized in that, its chemical composition wt% content is: C 0.002%～0.005%, Si 0.004%～0.010%, and Mn 0.05%～0.15%, P≤0.015%, S≤0.010%, total oxygen: 0.0050%～0.0080%, full aluminium≤0.0050%, all the other are iron and not higher than 0.1% impurity.
2. the production method of the described conduction use of claim 1 ultra low carbon steel wire rod, is characterized in that, concrete grammar is:
(1), control Oxygen Content in Liquid Steel and lower carbon content before the RH refining, converter smelting tapping carbon content control is≤0.040%, Oxygen Content in Liquid Steel is controlled at 0.060%-0.070%;
(2), the RH refining divides two stages: the first stage is taked nature decarburization mode, forbids heating up and forcing decarburization, and the time is 5-8 min; Subordinate phase is supplemented oxygen level in molten steel, utilizes oxygen gun blowing, and Control for Oxygen Content is at 0.030%-0.050%, improve carbon, oxygen speed of reaction, carbon content is dropped to below 0.0030%, oxygen blow duration 15-20 min, and temperature is adjusted to pouring temperature, and adopt low-carbon (LC) or carbon-free ladle to smelt;
(3), continuous casting: adopt the bloom protective casting, steel billet cross dimensions 280 * 380mm, Metal in Tundish superheating temperature≤30 ℃, induction stirring electric current >=400A, pulling rate is between 0.5-0.7m/min;
(4), rod rolling: enter the Dual module temperature and be controlled at 880-900 ℃, laying temperature 900-920 ℃, roller table speed 0.2-0.4m/s, blower fan Close All, stay-warm case is closed, and guarantees that wire rod obtains the interior tissue of low strength, large grain-size under lower cooling rate.
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Application publication date: 20131225 |