CN104294150A - Steel for shielded wires, and manufacturing method thereof - Google Patents
Steel for shielded wires, and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses steel for shielded wires and a manufacturing method of the steel. The steel comprises the following chemical components in percentage by weight: 0.001-0.05% of C, 0.001-0.1% of Si, 0.05-0.20% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.01-0.25% of Ti, and the balance of Fe and inevitable impurities. The manufacturing method is carried out according to the regular technology of clean steel, and comprises the following steps: conducting molten iron desulphurization treatment in a blast furnace; smelting in a converter; argon blowing; processing in an RH furnace; continuous casting; billet accepting; billet heating; high line rolling; stelmor controlled cooling; coil collecting; baling and packaging. Practice proves that the steel is high in strength, good in toughness and light in weight; meanwhile, the manufacturing method is simple in technology and convenient to operate.
Description
Technical field
The present invention relates to appliance cord steel technical field, specifically refer to a kind of shielding wire steel and production method.
Background technology
In appliance cord industry, widely used shielding wire, was mainly made by fine copper in the past.In recent years, the features such as the Ultra-low carbon shielding wire steel drawing property that purity of steel is high because having, cold working hardening is little and fabulous, fabulous function of shielding, are widely used in various shielding wire and make.Ultralow shielding wire steel wire rod for the production of shielding wire, compared with the shielding wire produced with fine copper, due to its have that intensity is high, good toughness, lightweight and shield effectiveness good, develop the Regeneration variety becoming the latter rapidly, marketing is enormously potential.Meanwhile, because this steel will have fabulous cold-workability and toughness, high to production technology content, therefore this product made from steel has good economic and social benefit.But before making the present invention, market also there is no a kind of shielding wire steel and production method thereof of high comprehensive performance.
Summary of the invention
Object of the present invention is exactly will for the deficiencies in the prior art, provides that a kind of intensity is high, good toughness, lightweight shielding wire steel, and this provides the production method of this steel simultaneously, and this production method technique is simple, easy to operate.
For achieving the above object, shielding wire steel of the present invention, its chemical composition is counted according to weight percent: C:0.001 ~ 0.05, Si:0.001 ~ 0.1, Mn:0.05 ~ 0.20, P≤0.015, S≤0.010, Ti:0.01 ~ 0.25, surplus is Fe and inevitable impurity.
Preferably, this steel chemical composition is counted according to weight percent: C:0.001 ~ 0.005, Si:0.001 ~ 0.01, Mn:0.08 ~ 0.10, P≤0.015, S≤0.010, Ti:0.05 ~ 0.15, and surplus is Fe and inevitable impurity.
The production method of shielding wire steel of the present invention, undertaken by usual Clean Steel technique, comprise the following steps: blast-melted desulfurization process, converter smelting, Argon, the process of RH stove, continuous casting, square billet examination, square billet heating, high speed wire rolling, stelmor control are cold, the step of collection volume, bailing, wherein:
During described blast-melted desulfurization process, adopt spray magnesium powder sulfur removal technology, control weight percentage≤0.010% of S during departures;
During described converter smelting, omnidistance top bottom blowing, each element wt percentage composition of terminal point control is: C≤0.06%, S≤50ppm, and tapping target temperature is 1630 ~ 1700 DEG C;
During described Argon, control argon pressure is 0.3 ~ 1.0MPa, and argon flow amount is 5.0 ~ 15.0Nm
3/ min.Preferably, molten steel arrives at a station Argon 3 ~ 10min, and then the large tank top of the slag spills aluminum shot and calcium carbide, and aluminum shot consumption is molten steel 45 ~ 55kg per ton, and calcium carbide consumption is molten steel 10 ~ 20kg per ton;
During described RH stove process, add aluminum shot and carry out final deoxygenation, in final deoxygenation steel, free oxygen reaches after below 0.0015%, adds Ti-Fe and carries out alloying, and the RH stove treatment time is 20 ~ 30min; Preferably, fine setting Mn, ensures that the manganese sulphur ratio of steel is greater than 10;
During described continuous casting, in target, bag molten steel overheat is 20 ~ 40 DEG C, and pulling rate is 0.5 ~ 1.0m/min;
During described square billet heating, heating zone temperature is 1100 ~ 1200 DEG C, and soaking zone temperature is 1180 ± 30 DEG C, the section temperature difference≤30 DEG C, and time inside furnace is 120 ~ 180min;
During described high speed wire rolling, roughing start rolling temperature is 1060 ± 30 DEG C, and finishing mill temperature in is 910 ± 15 DEG C, and reducing sizing mill temperature in is 900 ± 10 DEG C;
When described stelmor control is cold, laying temperature is 880 ± 10 DEG C, and Stelmor controlled cooling line roller table speed setting scheme is: the steel of Ф 5.5 ~ 8.5mm specification, and inlet velocity is 0.10 ~ 0.30m/s, and top speed is 0.30 ~ 0.50m/s; The steel of Ф 9 ~ 12mm specification, inlet velocity is 0.20 ~ 0.50m/s, and top speed is 0.30 ~ 0.60m/s; The steel of Ф 12.5 ~ 17mm specification, inlet velocity is 0.20 ~ 0.70m/s, and top speed is 0.30 ~ 0.90m/s.
In the mechanism that in shielding wire steel of the present invention, each constituent content controls and effect and production process, processing parameter setting principle is as follows:
Shielding wire steel of the present invention, produce cold hardening Elements C, Si, Mn content is all very low, this steel is also very low to P, S content requirement, as much as possible to improve the cold-forming property of steel.Ti in steel can play all even crystal grain thinning and improve the poker effect of wire rod, to improve the cold punching performance of steel.The Main Function of Ti in steel is fixed nitrogen and solid carbon, eliminates these interstitial atoms, makes steel wire not produce folding line when weaving.
In the production method of steel of the present invention, it is as far as possible all very low that process for making is to make C, Si, S content, and after tapping, new slag made by large tank, carries out large tank slag upgrading.During the Argon of argon station, control argon pressure, argon flow amount, molten steel well and to arrive at a station argon blowing time, the large tank top of the slag spills aluminum shot calcium carbide and carries out slag upgrading, more micro-blow after, rise after thermometric, sampling and winch to RH stove.Ferric oxide total amount (TFe)+MnO in slag can be reduced to 3 ~ 15% spilling aluminum shot etc. at argon station toward the large tank top of the slag, free oxygen in steel controls 0.04 ~ 0.15%, make slag have certain reductibility, prevent secondary oxidation of steel, but do not affect the decarburization of RH stove.Decarburization after entering RH refining furnace, deoxidation furnishing divide, and treat that in steel, free oxygen is less than 0.0015%, add ferrotianium and carry out Alloying Treatment.Alloying, according to the content of Mn in molten steel, starts when going out molten steel 1/3 to add ferromanganese with steel stream, adds before tapping 2/3, and in steel, Mn investigates the evidence of a case harvest and divides lower limit to control.Continuous casting improves the calm time of molten steel as far as possible, and middle bag baking is dry, molding casting; Ensure that strand low power is without subsurface bubble; Casting billet surface is smooth, and cutting knurl wants reconditioning to fall, and casting billet surface injustice is less than 2mm.Suitable circulation goes up continuous casting afterwards.During continuous casting, large bag adopts long nozzle to middle bag, and crystallizer adopts submerged nozzle molding casting.Bag molten steel overheat 20 ~ 40 DEG C (liquidus temperature=1528 DEG C) in target.Pulling rate 0.5 ~ 1.0m/min.Tundish adopts Mg matter covering slag, and crystallizer adopts carbon-less protecting slag.Induction stirring, adopts end induction stirring.Secondary cooling water, controls with soft1# water meter.Casting process is strictly by superheating temperature and pulling rate match control.During rolling, before steel rolling, to equipment, particularly rolling mill guiding wants close inspection, ensures wire rod surface quality.During rolling, heating process heating zone temperature 1100 ~ 1200 DEG C.Soaking zone temperature 1180 ± 30 DEG C, the section temperature difference≤30 DEG C.Furnace pressure keeps pressure-fired, and furnace atmosphere keeps weak reducing atmosphere.Time inside furnace: 120 ~ 180min.Roughing technique, high-pressure water descaling, the necessary standard-sized sheet of each water tap, hydraulic pressure is normal, ensures scale removal effect, is strictly on guard against the matrix of iron scale press-in steel in the operation of rolling; Start rolling temperature 1060 ± 30 DEG C.Finish-rolling process, finishing mill temperature in 910 ± 15 DEG C.Reducing sizing mill temperature in 900 ± 10 DEG C.Cooling control technology, laying temperature 880 ± 10 DEG C.Stelmor controlled cooling line roller table speed sets.Blower fan and insulation cover, last Fans standard-sized sheet, all the other are closed.1st group and 5 ~ 8 groups of insulation covers are opened, and all the other are closed, and make the average cooling rate of wire rod at 0.5 ~ 1.5 DEG C/s.
Facts have proved, the shielding wire steel utilizing the inventive method to produce, the good cold drawing performance had, deformation of products, without yield point elongation and good toughness, can be used for the manufacture of various shielding wire.
Embodiment
Below in conjunction with specific embodiment, shielding wire steel of the present invention and production method thereof are described in further details.
Embodiment 1
A kind of shielding wire steel, according to composition of steel requirement, its ladle chemistry is: C:0.001%, Si:0.01%, Mn:0.15%, P:0.005%, S:0.009%, Ti:0.01%, and surplus is Fe and inevitable impurity.
The production method of this shielding wire steel, undertaken by usual Clean Steel technique, comprise the following steps: blast-melted desulfurization process, converter smelting, Argon, the process of RH stove, continuous casting, square billet examination, square billet heating, high speed wire rolling, stelmor control are cold, the step of collection volume, bailing, wherein
During blast-melted desulfurization process: adopt spray magnesium powder sulfur removal technology, when controlling to set off, S has suffered percentage composition≤0.010%;
During converter smelting, omnidistance top bottom blowing, each constituent content of terminal point control [C]≤0.06%, [S]≤50ppm, tapping target temperature is 1640 DEG C;
During Argon, argon pressure is 0.6MPa, and argon flow amount is 10Nm
3/ min, molten steel arrives at a station Argon 8min, and then the large tank top of the slag spills aluminum shot and calcium carbide, and aluminum shot consumption is molten steel 50kg per ton, and calcium carbide consumption is molten steel 15kg per ton;
During described RH stove process, add aluminum shot and carry out final deoxygenation, in final deoxygenation steel, free oxygen reaches after below 0.0015%, adds Ti-Fe and carries out alloying, fine setting Mn, ensures that the manganese sulphur ratio of steel is greater than 10; RH stove process 25min;
During described continuous casting, in target, bag molten steel overheat is 30 DEG C, and pulling rate is 0.8m/min;
During square billet heating, soaking zone temperature is 1210 DEG C, and the section temperature difference≤30 DEG C are 120min in stove soaking time, makes the abundant austenitizing of steel;
During high speed wire rolling, product diameter 8.5mm, roughing start rolling temperature is 1090 DEG C, and finishing mill temperature in is 925 DEG C, and reducing sizing mill temperature in is 910 DEG C;
When stelmor control is cold, laying temperature is 870 DEG C, and Stelmor controlled cooling line roller table speed setting scheme is: the steel of Ф 8.5mm specification, and inlet velocity is 0.30m/s, and top speed is 0.50m/s, blower fan and insulation cover: last Fans standard-sized sheet, and all the other are closed.1st group and 5 ~ 8 groups of insulation covers are opened, and all the other are closed, and make the average cooling rate of wire rod at 0.5 ~ 1.5 DEG C/s, collection volume cool to room temperature after 700 DEG C.
Embodiment 2
A kind of shielding wire steel, according to composition of steel requirement, its ladle chemistry is by weight percentage: C:0.002%, Si:0.008%, Mn:0.12%, P:0.007%, S:0.003%, Ti:0.03%, and surplus is Fe and inevitable impurity.
The production method of this shielding wire steel, basic step is with embodiment 1, and difference is:
During Argon: argon pressure is 0.7MPa, argon flow amount is 12Nm
3/ min, molten steel arrives at a station Argon 7min, and then the large tank top of the slag spills aluminum shot and calcium carbide, and aluminum shot consumption is molten steel 52kg per ton, and calcium carbide consumption is molten steel 15kg per ton;
During continuous casting, in target, bag molten steel overheat is 40 DEG C, and pulling rate is 1.0m/min;
During square billet heating, soaking zone temperature is 1150 DEG C, the section temperature difference≤30 DEG C, and time inside furnace is 135min; To make the abundant austenitizing of steel.Austenitizing temperature is relevant with the composition of steel with the time, guarantee the complete solid solution of alloying element in steel, and furnace pressure keeps pressure-fired, and furnace atmosphere keeps weak reducing atmosphere.
During high speed wire rolling, product diameter 7.5mm, roughing start rolling temperature is 1080 DEG C, and finishing mill temperature in is 920 DEG C, and reducing sizing mill temperature in is 905 DEG C; When stelmor control is cold, laying temperature is 885 DEG C, and Stelmor controlled cooling line roller table speed setting scheme is: inlet velocity 0.25m/s, top speed 0.45m/s, blower fan and insulation cover: last Fans standard-sized sheet, and all the other are closed.1st group and 5 ~ 8 groups of insulation covers are opened, and all the other are closed, and make the average cooling rate of wire rod at 0.5 ~ 1.5 DEG C/s, collection volume cool to room temperature after 700 DEG C.
Embodiment 3
A kind of shielding wire steel, according to composition of steel requirement, its ladle chemistry is: C:0.003%, Si:0.006%, Mn:0.10%, P:0.009%, S:0.005%, Ti:0.10%, and surplus is Fe and inevitable impurity.Product diameter 6.5mm.
The production method of this shielding wire steel, basic step is with embodiment 1, and difference is:
During Argon: argon pressure is 0.4MPa, argon flow amount is 15.0Nm
3/ min, molten steel arrives at a station Argon 10min, and then the large tank top of the slag spills aluminum shot and calcium carbide, and aluminum shot consumption is molten steel 50kg per ton, and calcium carbide consumption is molten steel 15kg per ton;
During continuous casting, in target, bag molten steel overheat is 35 DEG C, and pulling rate is 0.9m/min;
During square billet heating, soaking zone temperature is 1180 DEG C, the section temperature difference≤30 DEG C, and time inside furnace is that 145min is to make the abundant austenitizing of steel;
During described high speed wire rolling, product diameter 6.5mm, roughing start rolling temperature is 1060 DEG C, and finishing mill temperature in is 910 DEG C, and reducing sizing mill temperature in is 900 DEG C;
When stelmor control is cold, laying temperature is 880 DEG C, and Stelmor controlled cooling line roller table speed setting scheme is: inlet velocity 0.20m/s, top speed 0.40m/s, blower fan and insulation cover: last Fans standard-sized sheet, and all the other are closed.1st group and 5 ~ 8 groups of insulation covers are opened, and all the other are closed, and make the average cooling rate of wire rod at 0.5 ~ 1.5 DEG C/s, collection volume cool to room temperature after 700 DEG C.
Embodiment 4
A kind of shielding wire steel, according to composition of steel requirement, its ladle chemistry is: C:0.004%, Si:0.004%, Mn:0.08%, P:0.011%, S:0.008%, Ti:0.15%, and surplus is Fe and inevitable impurity.
The production method basic step of this shielding wire steel is with embodiment 1, and difference is:
During Argon: argon pressure is 0.6MPa, argon flow amount is 11Nm
3/ min, molten steel arrives at a station Argon 7min, and then the large tank top of the slag spills aluminum shot and calcium carbide, and aluminum shot consumption is molten steel 48kg per ton, and calcium carbide consumption is molten steel 12kg per ton;
During continuous casting, in target, bag molten steel overheat is 25 DEG C, and pulling rate is 0.5m/min;
During heating, soaking zone temperature is 1160 DEG C, the section temperature difference≤30 DEG C, and time inside furnace is 150min;
During high speed wire rolling, product diameter 6.0mm.Roughing start rolling temperature is 1050 DEG C, and finishing mill temperature in is 905 DEG C, and reducing sizing mill temperature in is 895 DEG C;
When stelmor control is cold, laying temperature is 875 DEG C, and Stelmor controlled cooling line roller table speed setting scheme is: inlet velocity 0.20m/s, top speed 0.35m/s, blower fan and insulation cover: last Fans standard-sized sheet, and all the other are closed.1st group and 5 ~ 8 groups of insulation covers are opened, and all the other are closed, and make the average cooling rate of wire rod at 0.5 ~ 1.5 DEG C/s, collection volume cool to room temperature after 700 DEG C.
Embodiment 5
A kind of shielding wire steel, according to composition of steel requirement, its ladle chemistry is: C:0.005%, Si:0.001%, Mn:0.06%, P:0.015%, S:0.002%, Ti:0.25%, and surplus is Fe and inevitable impurity.
The production method of this shielding wire steel, basic step is with embodiment 1, and difference is:
During Argon: argon pressure is 0.6MPa, argon flow amount is 10Nm
3/ min, molten steel arrives at a station Argon 7min, and then the large tank top of the slag spills aluminum shot and calcium carbide, and aluminum shot consumption is molten steel 50kg per ton, and calcium carbide consumption is molten steel 15kg per ton;
During continuous casting, in target, bag molten steel overheat is 40 DEG C, and pulling rate is 0.6m/min;
During heating, soaking zone temperature is 1150 DEG C, the section temperature difference≤30 DEG C, and time inside furnace is 160min; During described high speed wire rolling, product diameter 5.5mm, roughing start rolling temperature is 1030 DEG C, and finishing mill temperature in is 895 DEG C, and reducing sizing mill temperature in is 890 DEG C; When stelmor control is cold, laying temperature is 870 DEG C, and Stelmor controlled cooling line roller table speed setting scheme is: inlet velocity 0.20m/s, top speed 0.30m/s, blower fan and insulation cover: last Fans standard-sized sheet, and all the other are closed.1st group and 5 ~ 8 groups of insulation covers are opened, and all the other are closed, and make the average cooling rate of wire rod at 0.5 ~ 1.5 DEG C/s, collection volume cool to room temperature after 700 DEG C.
Test the properties of the shielding wire steel that above-described embodiment 1 ~ 5 obtains, test result is shown in Table 1.
Table 1
The detected result of table 1 can be found out, the intensity of shielding wire steel of the present invention is all at more than 250MPa, after user's drawing work hardening, intensity can reach about 500MPa, after degenerating, product intensity can at more than 350MPa, ensure that the high speed netting performance of finished product, the cold-forming property of this steel is good, ensure that the requirement of drawing extra fine filament.
Claims (7)
1. a shielding wire steel, is characterized in that: this steel chemical composition is counted according to weight percent: C:0.001 ~ 0.05, Si:0.001 ~ 0.1, Mn:0.05 ~ 0.20, P≤0.015, S≤0.010, Ti:0.01 ~ 0.25, surplus is Fe and inevitable impurity.
2. shielding wire steel according to claim 1, it is characterized in that: this steel chemical composition is counted according to weight percent: C:0.001 ~ 0.005, Si:0.001 ~ 0.01, Mn:0.08 ~ 0.10, P≤0.015, S≤0.010, Ti:0.05 ~ 0.15, surplus is Fe and inevitable impurity.
3. the production method of shielding wire steel described in a claim 1, undertaken by usual Clean Steel production technique, comprise the following steps: blast-melted desulfurization, converter smelting, Argon, the process of RH stove, continuous casting, square billet examination, square billet heating, high speed wire rolling, stelmor control are cold, the step of collection volume, bailing, it is characterized in that:
During described blast-melted desulfurization process, adopt spray magnesium powder sulfur removal technology, control weight percentage≤0.010% of S during departures;
During described converter smelting, omnidistance top bottom blowing, each element wt percentage composition of terminal point control is: C≤0.06%, S≤50ppm, and tapping target temperature is 1630 ~ 1700 DEG C;
During described Argon, control argon pressure is 0.3 ~ 1.0MPa, and argon flow amount is 5.0 ~ 15.0Nm
3/ min;
During described RH stove process, add aluminum shot and carry out final deoxygenation, in final deoxygenation steel, free oxygen reaches after below 0.0015%, adds Ti-Fe and carries out alloying, and the RH stove treatment time is 20 ~ 30min;
During described continuous casting, in target, bag molten steel overheat is 20 ~ 40 DEG C, and pulling rate is 0.5 ~ 1.0m/min;
During described square billet heating, heating zone temperature is 1100 ~ 1200 DEG C, and soaking zone temperature is 1180 ± 30 DEG C, the section temperature difference≤30 DEG C, and time inside furnace is 120 ~ 180min;
During described high speed wire rolling, roughing start rolling temperature is 1060 ± 30 DEG C, and finishing mill temperature in is 910 ± 15 DEG C, and reducing sizing mill temperature in is 900 ± 10 DEG C.
4. the production method of shielding wire steel according to claim 3, it is characterized in that: during described Argon, molten steel arrives at a station Argon 3 ~ 10min, and then the large tank top of the slag spills aluminum shot and calcium carbide, aluminum shot consumption is molten steel 45 ~ 55kg per ton, and calcium carbide consumption is molten steel 10 ~ 20kg per ton.
5. the production method of shielding wire steel according to claim 3 or 4, is characterized in that: finely tune Mn during described RH stove process, ensures that the manganese sulphur ratio of steel is greater than 10.
6. the production method of shielding wire steel according to claim 3 or 4, it is characterized in that: when described stelmor control is cold, laying temperature is 880 ± 10 DEG C, Stelmor controlled cooling line roller table speed setting scheme is: the steel of Ф 5.5 ~ 8.5mm specification, inlet velocity is 0.10 ~ 0.30m/s, and top speed is 0.30 ~ 0.50m/s; The steel of Ф 9 ~ 12mm specification, inlet velocity is 0.20 ~ 0.50m/s, and top speed is 0.30 ~ 0.60m/s; The steel of Ф 12.5 ~ 17mm specification, inlet velocity is 0.20 ~ 0.70m/s, and top speed is 0.30 ~ 0.90m/s.
7. the production method of shielding wire steel according to claim 5, it is characterized in that: when described stelmor control is cold, laying temperature is 880 ± 10 DEG C, Stelmor controlled cooling line roller table speed setting scheme is: the steel of Ф 5.5 ~ 8.5mm specification, inlet velocity is 0.10 ~ 0.30m/s, and top speed is 0.30 ~ 0.50m/s; The steel of Ф 9 ~ 12mm specification, inlet velocity is 0.20 ~ 0.50m/s, and top speed is 0.30 ~ 0.60m/s; The steel of Ф 12.5 ~ 17mm specification, inlet velocity is 0.20 ~ 0.70m/s, and top speed is 0.30 ~ 0.90m/s.
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| CN107236902A (en) * | 2017-06-24 | 2017-10-10 | 武汉钢铁有限公司 | A kind of half-hard state cable steel and production method |
| CN107326281A (en) * | 2017-07-12 | 2017-11-07 | 武汉钢铁有限公司 | High welding performance Socket for electrical appliance steel and its production method |
| CN107739770A (en) * | 2017-10-23 | 2018-02-27 | 武汉钢铁有限公司 | One kind reduces ultra-low-carbon steel strand rimhole method |
| CN108062992A (en) * | 2017-11-07 | 2018-05-22 | 邢台钢铁有限责任公司 | Copper clad steel composite shielding cable steel wire rod and its production method |
| CN110055471A (en) * | 2019-05-23 | 2019-07-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Uniform low silicon content welding steel of structure property and preparation method thereof |
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| CN111979495A (en) * | 2020-09-29 | 2020-11-24 | 武汉钢铁有限公司 | High-conductivity cable steel for manufacturing thin-film capacitor lead and production method thereof |
| CN111979495B (en) * | 2020-09-29 | 2021-11-09 | 武汉钢铁有限公司 | High-conductivity cable steel for manufacturing thin-film capacitor lead and production method thereof |
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