CN102899554A - Annealing-free low-carbon steel wire rod and production method thereof - Google Patents
Annealing-free low-carbon steel wire rod and production method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 64
- 239000010959 steel Substances 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000007670 refining Methods 0.000 claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims abstract description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 21
- 239000004411 aluminium Substances 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 11
- 239000011572 manganese Substances 0.000 claims description 11
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 4
- 238000005275 alloying Methods 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 230000002829 reductive effect Effects 0.000 abstract description 3
- 238000009489 vacuum treatment Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 229910052748 manganese Inorganic materials 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 238000005261 decarburization Methods 0.000 description 5
- 239000005864 Sulphur Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000005491 wire drawing Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000009847 ladle furnace Methods 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention provides an annealing-free low-carbon steel wire rod and a production method thereof, and the annealing-free low-carbon steel wire rod comprises the following chemical components: 0.04-0.10% of [ C ], 0.01-0.10% of [ Si ], and [ Mn ]: 0.20 to 0.35 percent, less than or equal to 0.015 percent of [ P ], less than or equal to 0.010 percent of [ S ], less than or equal to 0.0060 percent of [ N ], total oxygen: 0.0030-0.0060 percent of aluminum, 0.0020-0.0080 percent of total aluminum, 0.1 percent of inevitable impurities and the balance of iron. The manufacturing method comprises the steps of converter smelting, LF refining, continuous casting and rolling, wherein incomplete deoxidation is carried out after a converter, the aluminum content of the molten steel is reduced by utilizing the higher oxygen activity of the molten steel, the recarburization of the molten steel in the refining process is inhibited, the protection casting of a large square billet is carried out, the temperature of a double module is controlled to be at 920 ℃ for throwing, 870 ℃ for throwing and 900 ℃ for rolling, the speed of a roller way is 0.2-0.4m/s, and a fan is turned off. The vacuum treatment process is omitted, the process flow is shortened, the production cost is reduced, and the requirement of a user for removing the annealing process in the drawing process is met. The annealing-free low-carbon steel wire rod produced according to the components and the production method has the grain size controlled within 20-30um, the tensile strength less than or equal to 350MPa and the surface shrinkage more than or equal to 75 percent.
Description
Technical field
The invention belongs to soft steel and make the field, relate in particular to a kind of exempt to anneal low-carbon steel rod bundle and manufacture method thereof.
Background technology
Along with the fast development of national economy and the further reinforcement of social environment protection consciousness; low-carbon (LC), ultra low-carbon steel there has been widely requirement; except traditional low carbon drawn wire material, the market of high-performance galvanized steel wire, soft steel fiber steel wire and low-carbon (LC) conduction steel wire is also in fast development at present.The drawing production process of Mild Steel Wire requires wire rod to have the low strength high-ductility, and lower tensile strength and higher plasticity can be cancelled the annealing heat treatment step in the drawing process, thereby reduces the pollution to environment, reduces carbon emission.
The patent No. is the method that CN200710159224.7 discloses a kind of smelting suprelow carbon steel.Smelting control method comprises molten iron pretreatment desulfurizing, converter smelting, the refining of LF stove, RH vacuum-treat, continuous casting working procedure.Not deoxidation of converter tapping, LF carries out refining, forces the deoxidation decarburization in the RH vacuum treatment installation.The patent No. is the production technique that CN200910244375.1 discloses a kind of smelting high-level low-carbon steel at low cost.Adopt converter, RH refining, ladle furnace refining, continuous casting process to produce soft steel, part decarburization function is born in converter, performance RH refining decarburization function, ladle furnace desulfurization, intensification and trimming.Patent No. PCT/AU2009/000986 is method (the LOW COST MAKING OF A LOW CARBON that discloses the traditional steelmaking equipment low cost production of a kind of usefulness low-carbon (LC), low-sulfur and low nickel steel, LOW SULFUR, AND LOW NITROGEN STEEL USING CONVENTIONAL STEELMAKING EQUIPMENT adopt VTD vacuum-treat decarburization, desulfurization.Patent CN200710159224.7, patent CN200910244375.1 and patent PCT/AU2009/000986 all adopt vacuum-treat on production technique, increased smelting cost, traditional soft steel production technique is converter smelting, LF refining, vacuum-treat (RH/VD), continuous casting, rolling, exist technical process long, the problem that production cost is high.
Patent CN200710023901.2 discloses low-carbon steel rod bundle.Carbon is 0.04%～0.10% in the wire rod, and manganese is 0.25%～0.60%, and niobium is 0.008%～0.017%, and boron is 20～40ppm, and wire rod intensity is at 430～480MPa.In steel, add niobium, boron alloy element, increased cost of alloy.
Summary of the invention
The object of the invention is to overcome the problems referred to above and not enough and a kind of low cost exempt to anneal low-carbon steel rod bundle and production method thereof be provided, guarantee that wire rod has larger grain-size, lower tensile strength and higher reduction of area value, satisfy the user and in the drawing production process, cancel the Drawing-anneal processing requirement, reduction reduces carbon emission to the pollution of environment.
The present invention is achieved in that the moiety weight percent (Wt%) of this low-carbon steel rod bundle of exempting to anneal is: [C]: 0.04%～0.10%, [Si]: 0.01%～0.10%, [Mn]: 0.20%～0.35%, [P]≤0.015%, [S]≤0.010%, [N]≤0.0060%, total oxygen: 0.0030%～0.0060%, full aluminium 0.0020%～0.0080%, inevitably impurity is not higher than 0.1%, and all the other are iron.
Composition Design of the present invention be the reasons are as follows:
Carbon forms interstitial solid solution with iron in steel, help to improve the intensity of steel.But the angle from Steel Wire Drawing Process requirement and wire rod intensity control requires low as far as possible.But extremely low carbon content need to be carried out vacuum decarburization and be processed the increase production cost.Therefore carbon is controlled at 0.04%～0.10%.
The most of solid solution of silicon can improve the intensity of steel in ferrite, have simultaneously desoxydatoin, can eliminate FeO and be mingled with detrimentally affect to the quality of steel.From improving the steel wire drawing performance perspective, silicone content requires low as far as possible.But extremely low silicone content need to adopt special-purpose ladle and refractory materials at refining process, increases the steel grade production cost.Therefore this patent silicon will be controlled at 0.01%～0.10%.
Manganese has good desoxydatoin, can remove the FeO in the steel, greatly improve the quality of steel, particularly reduce the fragility of steel, manganese can form MnS with sulphur, to eliminate the deleterious effect of sulphur, improves the processing characteristics of steel, therefore must guarantee certain manganese content in the steel, manganese also has the effect of solution strengthening simultaneously.In order to bring into play fully its effect, manganese is controlled at more than 0.2%, if but the manganese surplus can make the steel embrittlement, reduce hot candied performance, so manganese to be controlled at 0.20%～0.35%.
Phosphorus, sulphur all are detrimental impurity elements in the steel, and phosphorus can be separated out the very large Fe3P of fragility in steel, make steel at room temperature intensity improve, fragility increases, and namely increases the cold shortness of steel, simultaneously phosphorus easily segregation and be difficult to eliminate in the crystallisation process of steel.Sulphur is hardly dissolving in iron, and forms FeS with iron, and FeS and Fe form low-melting eutectic, cause cracking owing to be distributed in easy thawing of the eutectic of crystal boundary when hot-work, namely increase the red brittleness of steel.For guaranteeing that wire rod has good performance, require [P]≤0.015% in the steel, [S]≤0.010% is in the situation that does not cause other influences, more low better.
Aluminium is general in steel to be used for deoxidation, reduces the total oxygen content of steel, has simultaneously the effect of crystal grain thinning, mainly is because aluminium forms the effect that infusible compound that small and dispersed distributes plays inhibiting grain growth at steel other element that neutralizes, and mainly is the impact of AlN.Tiny crystal grain is unfavorable for intensity and the drawing process of control wire rod, therefore will reduce Holo-Al content in the steel; It is unfavorable to the oxygen level of control steel to cross low aluminium content.Therefore this patent is controlled at the Holo-Al content in the steel between the 0.0020%-0.0080%.
The solubleness of nitrogen in steel is very low, superfluous nitrogen just is dissolved in the steel to supersaturation, nitride can occur in heat-processed separate out phenomenon, hardness, the intensity of steel are improved, plasticity descends, and increases the work hardening rate of steel, and steel wire drawing is brought disadvantageous effect, its content should be low as far as possible, so the nitrogen in steel content requirement is not more than 0.0060%.
Total oxygen content in the steel represents the cleanliness factor of steel, and the oxygen level increase can make intensity, the Plasticity Decreasing of steel, for guaranteeing user's drawing requirement, needs it is controlled at certain limit.Too high total oxygen content produces the strand gas hole defect easily, bring difficulty to continuous-casting of steel billet, cross low total oxygen content and need the strong deoxidation of aluminium deoxidizer, and the higher molten steel aluminium content of assurance, thereby make wire rod aluminium content also higher, its grain refining effect is remarkable, improves on the contrary wire rod intensity, can not guarantee user's drawing requirement.Therefore the wire rod total oxygen content is controlled at 0.0030%～0.0060%.
Low-carbon steel rod bundle basal component among the present invention as mentioned above, rest part is iron and inevitable impurity, these impurity also allow, but foreign matter content must not be higher than 0.1% along with starting material etc. are sneaked into.
Exempting from of relating among the present invention low-carbon steel rod bundle production method of annealing is as follows: 1) converter smelting: incomplete deoxidation low-carbon (LC) tapping is adopted in converter, the tapping carbon content control is at 0.03%-0.06%, add carbon ferromanganese 2-2.5Kg/t, aluminium ferromanganese 5-6Kg/t deoxidation behind the Converter, suppress the carburetting of refining process molten steel.2) LF refining: adopt the submerged arc heating, prevent molten steel nitrogen pick-up, alloying is taken out of full aluminium and is not more than 0.012% with mid-carbon fe-mn or manganese metal, LF.3) continuous casting: adopt the bloom protective casting, prevent molten steel nitrogen pick-up, steel billet cross dimensions 280mm*380mm; the Metal in Tundish superheating temperature is not more than 30 ℃; induction stirring electric current 〉=400A prevents that steel billet from producing gas hole defect, and pulling rate is controlled between 0.5m/min-0.7m/min.4) rolling: enter the Dual module temperature and be controlled at 900-920 ℃, keep higher rolling temperature to obtain larger grain-size, laying temperature 870-900 ℃, roller table speed 0.2-0.4m/s closes blower fan, guarantees that wire rod obtains low strength under lower cooling rate.
The grain-size of low-carbon steel rod bundle of the present invention is controlled at 20-30um, tensile strength≤350MPa, reduction of area index 〉=75%.
Low-carbon steel rod bundle of the present invention is incomplete deoxidization technique by Composition Design and after adopting Converter, improves refining process molten steel oxygen activity, reduces the deoxidation cost.Utilize the higher oxygen activity of molten steel, reduce molten steel aluminium content, prevent that molten steel from increasing aluminium, reduce the effect of its crystal grain thinning; Simultaneously, utilize the higher oxygen activity of molten steel, suppress the carburetting of refining process molten steel, for the intensity that reduces wire rod creates conditions.By taking above-mentioned smelting measures, and design in conjunction with rolling technology, developed a kind of low-carbon steel rod bundle of annealing of exempting from, and reduced in process of production smelting procedure, namely without vacuum-treat (RH/VD) operation, shortened process reduces production costs, and has satisfied the user cancels annealing process in drawing process requirement.According to the low-carbon steel rod bundle of annealing of exempting from of the composition that relates among the present invention and production method production, its grain-size is controlled at 20-30um, tensile strength≤350MPa, reduction of area 〉=75%.
Embodiment
The present invention is further illustrated below by embodiment.
The embodiment of the invention is smelted with rolling according to the component proportion of technical scheme.The chemical ingredients of embodiment of the invention steel sees Table 1.Rolling technology and the performance of embodiment of the invention steel see Table 2.
The process of bessemerizing adds reductor mid-carbon fe-mn 2-2.5Kg/t, the incomplete deoxidation of aluminium ferromanganese 5-6Kg/t, and the tapping carbon content control is at 0.03%-0.06%; The heating of LF stove refining submerged arc, Argon add mid-carbon fe-mn or manganese metal alloying, and the LF stove is taken out of full aluminium and is not more than 0.012%, guarantee to take out of 1620 ℃ of temperature; 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 m/min-0.6m/min; Rod rolling enters 905 ℃-920 ℃ of Dual module temperature, 880 ℃-900 ℃ of laying temperatures, roller table speed 0.25-0.4m/s, blower fan Close All, rolling wire rod diameter of phi 5.5mm uses wire rod cancellation in the user produces of the Φ 5.5mm of the present invention's production and anneals direct drawing to Φ 0.6-Φ 1.0mm.
The chemical ingredients (wt%) of table 1 embodiment of the invention steel
| Embodiment | C | Si | Mn | P | S | O | N | Al |
| 1 | 0.06 | 0.02 | 0.30 | 0.011 | 0.007 | 0.0056 | 0.0053 | 0.0076 |
| 2 | 0.06 | 0.05 | 0.28 | 0.010 | 0.006 | 0.0049 | 0.0058 | 0.0069 |
| 3 | 0.07 | 0.07 | 0.32 | 0.012 | 0.005 | 0.0057 | 0.0049 | 0.0073 |
| 4 | 0.08 | 0.06 | 0.25 | 0.015 | 0.011 | 0.0051 | 0.0050 | 0.0079 |
Rolling technology and the performance of table 2 embodiment of the invention steel
Claims (2)
1. exempt from the low-carbon steel rod bundle of annealing for one kind, it is characterized in that its chemical component weight per-cent is: [C]: 0.04%～0.10%, [Si]: 0.01%～0.10%, [Mn]: 0.20%～0.35%, [P]≤0.015%, [S]≤0.010%, [N]≤0.0060%, total oxygen: 0.0030%～0.0060%, full aluminium 0.0020%～0.0080%, inevitably impurity is not higher than 0.1%, and all the other are iron.
2. the manufacture method of the described low-carbon steel rod bundle of exempting to anneal of a claim 1 is characterized in that, adopts the operational path of " converter smelting → LF refining → continuous casting → rolling ":
1) converter smelting: not exclusively deoxidation low-carbon (LC) tapping, tapping carbon content control add mid-carbon fe-mn 2-2.5Kg/t, aluminium ferromanganese 5-6Kg/t deoxidation at 0.03%-0.06% behind the Converter;
2) LF refining: the submerged arc heating, alloying is taken out of full aluminium and is not more than 0.012% with mid-carbon fe-mn or manganese metal, LF;
3) continuous casting: the bloom protective casting, steel billet cross dimensions 280mm*380mm, the Metal in Tundish superheating temperature is not more than 30 ℃, and induction stirring electric current 〉=400A, pulling rate are controlled at 0.5m/min-0.7m/min;
4) rolling: enter 900-920 ℃ of Dual module temperature, laying temperature 870-900 ℃, roller table speed 0.2-0.4m/s closes blower fan.
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| CN108359890A (en) * | 2018-02-13 | 2018-08-03 | 鞍钢股份有限公司 | Wire rod for ultrahigh conductive steel wire and production process thereof |
| CN110722330A (en) * | 2019-10-31 | 2020-01-24 | 武汉钢铁有限公司 | Production method of ultra-low carbon steel wire rod for electric conduction |
| CN112139266A (en) * | 2020-08-31 | 2020-12-29 | 南京钢铁股份有限公司 | Annealing-free wire drawing method |
| CN112139266B (en) * | 2020-08-31 | 2022-09-20 | 南京钢铁股份有限公司 | Annealing-free wire drawing method |
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