CN102492814B - Manufacturing method of straight pull wire for high-carbon steel fine wires - Google Patents
Manufacturing method of straight pull wire for high-carbon steel fine wires Download PDFInfo
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- CN102492814B CN102492814B CN 201110419701 CN201110419701A CN102492814B CN 102492814 B CN102492814 B CN 102492814B CN 201110419701 CN201110419701 CN 201110419701 CN 201110419701 A CN201110419701 A CN 201110419701A CN 102492814 B CN102492814 B CN 102492814B
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Abstract
The invention discloses a straight pull wire for high-carbon steel fine wires and a manufacturing method for the straight pull wire. The carbon content of the original coil rod of the straight pull wire is between 0.69 and 0.73 weight percent, the tensile strength is between 900 and 960 MPa, the reduction of areas is between 35 and 44 percent, the sizes of indeformable impurities are less than 15micrometers, and the coil rod can be pulled directly to the diameter of between 0.9 and 2.0 millimeters from 5.5 millimeters. The manufacturing method comprises the following processes of: smelting in an electric furnace, refining outside the furnace, performing continuous casting of small square billets, performing high-speed wire rolling control and stelmor wire cooling control, wherein phase change is performed at the temperature of between 600 and 680 DEG C in the process of the stelmor wire cooling control, and temperature difference between a coil overlapping point and other positions does not exceed 50 DEG C. The straight pull wire meets the using requirements of straight pull materials for the high-carbon steel fine wires completely, and the intermediate heat treatment process in the process of machining the high-carbon steel fine wires such as steel cords, tire bead steel wires, rubber tube wires and the like can be eliminated, so the straight pull wire has the advantages of saving energy, reducing pollution and cost, and the preparation process is simple and controllable, and meets the requirement of large-scale industrial production.
Description
Technical field
The present invention be more particularly directed to a kind of high carbon steel filament with vertical pulling wire rod and manufacture method thereof, belong to ferrous metallurgy and steel rolling field.
Background technology
Rubber skeleton class wire rod is the highest kind of specification of quality in the high-carbon wire fabrication, and its complete processing is numerous and diverse.Be example with the steel cord, traditional production technique is as follows: Φ 5.5mm wire rod → first road is drawn to Φ 3.0～3.5mm → 980～1050 ℃ austenitizing → 570～590 ℃ of sorbitizing → second roads and is drawn to Φ 0.8～1.6mm → 980～1050 ℃ austenitizing → 570～590 ℃ of sorbitizing → plating → 480 ℃ diffusion annealing → the 3rd roads and is drawn to Φ 0.15～0.38mm → plying, draft can reach 99.9%, and elongation can reach more than 1300 times.When producing the steel cord with the vertical pulling material, Φ 5.5mm wire rod directly pulls to Φ 0.9～2.0mm, then through a thermal treatment, eliminates work hardening, recovers the plasticity of wire rod, then carries out the 2nd passes of drawing to Φ 0.15～0.38mm, just can pool capital.During having omitted, the vertical pulling material draws thermal treatment, letter economizes operation, has reduced the consumption of manpower, machinery, equipment etc., has saved production cost, energy-conserving and environment-protective more are an important development trend of rubber skeleton class materials processing technologies such as steel cord, steel bead wire, rubber tube wire.
Because vertical pulling material single pass drawing deformation amount is bigger than common wire, higher to the wire rod requirement, be example with 72 rank vertical pulling materials, wire rod intensity should not surpass 960Mpa, and reduction of area should not be lower than 30%.If intensity greater than 960MPa, adds the work hardening that causes after the drawing, the intensity of wire rod and hardness are increased, increase mould loss and production cost.Plasticity and the homogeneity of structure of reduction of area reflection wire rod, plasticity is too poor, easily causes the drawing fracture of wire.Mechanical property such as intensity and reduction of area is by organization decided.In actual production process, process for cooling determines tissue and the performance of product.Strong cold technology is adopted in the production of tradition carbon steel wire rod with high, and the tensile strength of common 72 rank wire products can't adopt vertical pulling explained hereafter high carbon steel filament up to 1050～1100MPa; And unrelieved stress is bigger, needs the long timeliness phase before the production; In addition, the strong cold center segregation place that causes easily forms martensite, causes the drawing fracture of wire.
Summary of the invention
The objective of the invention is at not enough a kind of high carbon steel filament vertical pulling wire rod and the manufacture method thereof of proposing of the prior art, adopt this vertical pulling wire-rod roll processing rubber skeleton class material, draw thermal treatment in can omitting, play save energy, reduce the effect of polluting, reducing use cost.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of high carbon steel filament is with the manufacture method of vertical pulling wire rod, comprises that electrosmelting, external refining, continuous small-billet casting, the high line traffic control of carrying out successively roll and stelmor line traffic control cooling working procedure, in these operations:
(1) electric furnace molten iron Intake Quantity 〉=60wt%, all the other cut steel scrap for wire rod or sheet material;
(2) molten iron adopts the desulfurization of magnesium powder, Ti≤0.05wt% after the desulfurization, and S≤0.003wt%, temperature is higher than 1300 ℃, and the rate of skimming of desulfurized molten iron bag is greater than 95wt%;
(3) tapping temperature is 1605～1635 ℃, uses the ferrosilicon deoxidation during tapping, and tapping process carries out alloying;
(4) refining time 〉=35 minute, synthetic slag is adopted in refining, control basicity 0.90～1.10, hold-time 〉=25 minute in this basicity scope; Soft churning time 〉=18 minute, pressure fine motion occurs with the top of the slag and is as the criterion;
(5) continuous casting adopts 10～30 ℃ of superheating temperature, and casting speed is 2.0～2.5m/min, and two cold-zone first three section water distribution quantities are respectively 60～80L/min, 100～120L/min, 40～60L/min, and casting blank cross-section size is 140mm * 140mm～160mm * 160mm;
(6) cool off in stelmo line control rolling back, 820～860 ℃ of laying temperatures, and roller table speed 1.0～1.4m/s, and open number one, No. second, No. seven blower fan fully, fan delivery is greater than 15.7 ten thousand m
3/ h makes speed of cooling control at 10～21 ℃/s.
Further, in stelmor line traffic control cooling working procedure, speed of cooling before the phase transformation＞17 ℃/s, during phase transformation temperature control at 600～680 ℃, and coil overlapped points and other position temperature difference≤50 ℃.
Below specify:
In electrosmelting, external refining and continuous small-billet casting operation:
(1) electric furnace molten iron Intake Quantity 〉=60wt%, all the other are the high-quality steel scrap.The molten iron ratio height of packing into is selected the high-quality steel scrap for use, has controlled impurity element S, P, Cu, Ni equal size from the source; Simultaneously, molten iron content height, steel scrap content is few, can reduce electrode and use, and reduces the finished product nitrogen content.
(2) molten iron adopts the desulfurization of magnesium powder, Ti≤0.05wt% after the desulfurization, and S≤0.003wt%, temperature is higher than 1300 ℃, and the rate of skimming of desulfurized molten iron bag is greater than 95wt%.Desulfurizing iron has guaranteed that final finished S content is lower than 0.01wt%; Skim after the desulfurization, prevent that effectively S gets back in the steel in the slag, guarantee sweetening effectiveness.
(3) electrosmelting, 1605～1635 ℃ of tapping temperatures are avoided the slag of tapping down, use the ferrosilicon deoxidation during tapping, and tapping process carries out alloying, and the alloy addition sequence is ferrosilicon → low carbon ferromanganese → special-purpose synthetic slag → lime → low nitrogen carburelant.Use the ferrosilicon deoxidation can effectively reduce Al
2O
3Content has prevented that the indeformable inclusion of magnesium-aluminium spinel class from producing; Reinforced diffusive deoxidation and the alloy homogenizing of being beneficial to of tapping process.
(4) refining time 〉=35 minute, synthetic slag is adopted in refining, control basicity 0.90～1.10, hold-time 〉=25 minute in this basicity scope; Soft churning time 〉=18 minute, pressure fine motion occurs with the top of the slag and is as the criterion, and does not allow the molten steel face exposed.Synthetic slag is CaO and SiO
2, add synthetic slag and can stablize control basicity than collocation according to certain mass; In 0.9～1.1 scope basicity, kept 25 minutes, guarantee that inclusion fully floats and fully plastification in the molten steel; Long soft churning time guarantees to float in the slag on large-scale inclusion fully, improves the cleanliness factor of molten steel.
(5) continuous casting adopts 10～30 ℃ of superheating temperature, and casting speed is 2.0～2.5m/min, and the crystallizer water distribution quantity is 1800L/min, and two cold-zone first three section water distribution quantities are respectively 60～80L/min, 100～120L/min, 40～60L/min; Casting blank section is 140mm * 140mm～160mm * 160mm; Be the high carbon steel of 0.69～0.73wt% for carbon content, when adopting continuous small-billet casting, low overheat helps to reduce center segregation, and slow pulling rate is mixed weak cold, can reduce strand column crystal content, helps to alleviate center segregation.
High line traffic control roll and stelmor line traffic control cooling working procedure in:
(6) start rolling temperature is 950～1020 ℃, and laying temperature is 820～860 ℃;
(7) rolling back is in stelmo line control cooling, and stelmor control cold line has 12 sections, comprises entrance and outlet section, and middle the 1st section to the 10th section; Wherein is furnished with blower fan for the 1st section to 6 sections, 2 every section; Entrance length is 3.5m, all the other every section 9 meters;
(8) stelmor control cold line upper inlet speed is 1.0m/s, and first section to the 8th section raceway speed is 1.1～1.4m/s, first section to the 3rd section speedup, and speed ratio is 0～20%, the 4th section to the 8th section deceleration, speed ratio is-3～-15%;
(9) open 3 typhoon machines, all the other blower fans cut out, and the 1st section to the 4th section has eight typhoon machines altogether, and fan delivery is followed successively by: 100%, 100%, 0%, 0%, 0%, 0%, 100%, 0%, and wherein 100% expression air quantity size is 150000～160000m
3/ h; 0% expression blower fan is not opened, and air quantity is 0;
(10) according to above parameter setting, guarantee the preceding speed of cooling of phase transformation greater than 17 ℃/s, cold soon before the phase transformation, suppress cementite network and separate out along austenite grain boundary; The phase transition process blower fan cuts out, and guarantees that phase transformation carries out at 600～680 ℃, prevents that the low excessively tissue lamellar spacing that causes of transformation temperature is meticulous or generate bainite, and this all can make work hardening rate strengthen, and is unfavorable for the drawing of aximal deformation value; The roller table speed in phase transformation stage is 1.1～1.4m/s, raceway speed faster, with the wire rod spacing draw bigger, reduced the temperature difference at overlapped points place and middle place, the temperature difference is controlled about 50 ℃, makes horizontal cooling more even.
According to the high carbon steel filament vertical pulling material that manufacture method of the present invention is produced, the about 80v/v% of sorbite content does not contain ferrite network and cementite network in the microstructure, and the tensile strength of original wire rod is between 900～960Mpa, and reduction of area is between 35～44%.The undulating quantity of wire rod performance is less, and strength fluctuation is less than 30Mpa, and the reduction of area undulating quantity is about 4%, and the structure property of wire rod is more even.In addition, Control and Inclusion Removal is all right, does not have the above indeformable inclusion of 20 μ m and the above TiN of 2 μ m to be mingled with.
Embodiment
Below in conjunction with some preferred embodiments technical scheme of the present invention is further described.
Embodiment 1 this high carbon steel filament comprises steel-making continuous casting and steel rolling process with the manufacture method of vertical pulling wire rod, the product original disc bar size Φ 5.5mm that obtains, production process is specially: and electrosmelting → external refining → continuous casting 140 square billets → high line traffic control rolls → and the stelmor line traffic control is cold, key control parameter is: (1) 82 ton of molten iron+32 ton high-quality steel scrap, 1350 ℃ of molten iron temperatures, molten iron is after the desulfurization of spray magnesium powder, and S content is 0.0020wt%, and sweetening process is skimmed 5 times; (2) tapping temperature is 1630 ℃, uses the ferrosilicon deoxidation during tapping, adds the special-purpose synthetic slag of 310kg ferrosilicon → 550kg low carbon ferromanganese → 1000kg → 200kg lime → low nitrogen carburelant then successively; (3) refining time is 45 minutes, refining slag basicity R=1.05, soft churning time 20 minutes; (4) the continuous casting superheating temperature is 23 ℃, and 140mm * 140mm square billet casting speed is 2.30m/min, and two cold-zone first three section water distribution quantities are respectively 60L/min, 100L/min, 50L/min; (5) start rolling temperature is 1000 ℃, 830 ℃ of laying temperatures, and first, second, third and fourth section raceway speed is respectively 1.10m/s, 1.20m/s, 1.30m/s, 1.40m/s, first is respectively to the 8th typhoon fan delivery: 100%, 100%, 0%, 0%, 0%, 0%, 100%, 0%.The result is as shown in table 1 for the wire rod comprehensive test, uses this wire rod, directly pulls to 1.8mm from Φ 5.5mm, passes through a time thermal treatment then, then pulls to Φ 0.22mm, has omitted the intermediate heat treatment operation.
Embodiment 2 these high carbon steel filaments comprise steel-making continuous casting and steel rolling process with the manufacture method of vertical pulling wire rod, the product original disc bar that obtains is of a size of Φ 5.5mm, its production process is specially: and electrosmelting → external refining → continuous casting 140 square billets → high line traffic control rolls → and the stelmor line traffic control is cold, key control parameter is: (1) 81 ton of molten iron+30 ton Wide and Thick Slab steel scrap, 1380 ℃ of molten iron temperatures, molten iron is after the desulfurization of spray magnesium powder, and S content is 0.0028wt%, and sweetening process is skimmed 5 times; (2) tapping temperature is 1625 ℃, uses the ferrosilicon deoxidation during tapping, adds the special-purpose synthetic slag of 300kg ferrosilicon → 540kg low carbon ferromanganese → 1000kg → 200kg lime → low nitrogen carburelant then successively; (3) refining time is 43 minutes, refining slag basicity R=0.98, soft churning time 21 minutes; (4) the continuous casting superheating temperature is 20 ℃, and 140mm * 140mm square billet casting speed is 2.40 meters/min, and two cold-zone first three section water distribution quantities are respectively 50L/min, 110L/min, 55L/min; (5) start rolling temperature is 1010 ℃, 840 ℃ of laying temperatures, first, second, third and fourth section raceway speed is respectively 1.1m/s, 1.21m/s, 1.33m/s, 1.26m/s, and first straight the 8th typhoon fan delivery is respectively: 100%, 100%, 0%, 0%, 0%, 0%, 100%, 0%.The result is as shown in table 1 for the wire rod comprehensive test, uses this wire rod, directly pulls to Φ 1.83mm from Φ 5.5mm, passes through a time thermal treatment then, then pulls to 0.30mm, has omitted the intermediate heat treatment operation.
Embodiment 3 these high carbon steel filaments comprise steel-making continuous casting and steel rolling process with the manufacture method of vertical pulling wire rod.The product original disc coil diameter that obtains is 5.5mm, its production process is specially: and electrosmelting → external refining → continuous casting 140 square billets → high line traffic control rolls → and the stelmor line traffic control is cold, key control parameter is: (1) 83 ton of molten iron+30 ton Wide and Thick Slab steel scrap, 1356 ℃ of molten iron temperatures, molten iron is after the desulfurization of spray magnesium powder, S content is 0.0023wt%, and sweetening process is skimmed 5 times; (2) tapping temperature is 1620 ℃, uses the ferrosilicon deoxidation during tapping, adds the special-purpose synthetic slag of 305kg ferrosilicon → 550kg low carbon ferromanganese → 1000kg → 200kg lime → low nitrogen carburelant then successively; (3) refining time is 38 minutes, refining slag basicity R=1.10, soft churning time 24 minutes; (4) the continuous casting superheating temperature is 23 ℃, and 160mm * 160mm square billet casting speed is 2.45 meters/min, and two cold-zone first three section water distribution quantities are respectively 60L/min, 120L/min, 55L/min; (5) start rolling temperature is 990 ℃, 820 ℃ of laying temperatures, first, second, third and fourth section raceway speed is respectively 1.15m/s, 1.32m/s, 1.32m/s, 1.27m/s, and first straight the 8th typhoon fan delivery is respectively: 100%, 100%, 0%, 0%, 0%, 0%, 100%, 0%.The result is as shown in table 1 for the wire rod comprehensive test, uses this wire rod, directly pulls to Φ 1.78mm from Φ 5.5mm, passes through a time thermal treatment then, then pulls to Φ 0.32mm, has omitted the intermediate heat treatment operation.
Table 1 has been listed the detection analysis report of Φ 5.5 gren rod mechanical properties, inclusion among the embodiment 1-3.Wherein the inclusion detection is the sample of getting this stone or metal plate for standing a stove on as a precaution against fire bar different positions, has 12 vertical sections altogether, and area of detection is 462mm2, has added up indeformable inclusion and TiN and has been mingled with overall dimension.The definition long-width ratio less than 3 inclusion be indeformable being mingled with.Provided the statistic data of gren rod center, 1/4 place, edge's sorbitic rate, sorbitic rate is all more than 80%.Also measure simultaneously the mechanics performance inconsistency, and measure tensile strength and the reduction of area value of different positions, in a large amount of take off data, the undulating quantity that to get minimum and maximum value difference value be mechanical property.The undulating quantity of the maximum of tensile strength and reduction of area is respectively 35Mpa, 3.9%.Undulating quantity is more little, shows that mechanical property is more even.
Inclusion and mechanical performance data table in the table 1 embodiment 1-3 wire rod
Claims (2)
1. a high carbon steel filament is with the manufacture method of vertical pulling wire rod, comprises that electrosmelting, external refining, continuous small-billet casting, the high line traffic control of carrying out successively roll and stelmor line traffic control cooling working procedure, it is characterized in that:
(1) electric furnace molten iron Intake Quantity 〉=60wt%, all the other cut steel scrap for wire rod or sheet material;
(2) molten iron adopts the desulfurization of magnesium powder, Ti≤0.05wt% after the desulfurization, and S≤0.003wt%, temperature is higher than 1300 ℃, and the rate of skimming of desulfurized molten iron bag is greater than 95wt%;
(3) tapping temperature is 1605～1635 ℃, uses the ferrosilicon deoxidation during tapping, and tapping process carries out alloying;
(4) refining time 〉=35 minute, synthetic slag is adopted in refining, control basicity 0.90～1.10, hold-time 〉=25 minute in this basicity scope; Soft churning time 〉=18 minute, pressure fine motion occurs with the top of the slag and is as the criterion;
(5) continuous casting adopts 10～30 ℃ of superheating temperature, and casting speed is 2.0～2.5m/min, and two cold-zone first three section water distribution quantities are respectively 60～80L/min, 100～120L/min, 40～60L/min, and casting blank cross-section size is 140mm * 140mm～160 mm * 160mm;
(6) cool off in stelmo line control rolling back, 820～860 ℃ of laying temperatures, and roller table speed 1.0～1.4m/s, and open number one, No. second, No. seven blower fan fully, make speed of cooling control at 10～21 ℃/s;
The original wire rod carbon content of described vertical pulling wire rod is 0.69-0.73wt%, diameter is 5.5mm, and tensile strength is 900～960MPa, and reduction of area is 35～44%, indeformable inclusion size is less than 15 μ m, and the diameter of the original wire rod of this vertical pulling wire rod after direct drawing is at 0.9～2.0mm.
2. according to the manufacture method of the described high carbon steel filament of claim 1 with the vertical pulling wire rod, it is characterized in that, in stelmor line traffic control cooling working procedure, speed of cooling before the phase transformation＞17 ℃/s, temperature control is at 600～680 ℃ during phase transformation, and coil overlapped points and other position temperature difference≤50 ℃.
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| CN103397156A (en) * | 2013-07-25 | 2013-11-20 | 张家港市胜达钢绳有限公司 | Wire manufacturing method |
| CN103785704B (en) * | 2014-01-23 | 2016-01-20 | 江苏兴达钢帘线股份有限公司 | Anti-torsion layering and the preparation method of the extra high strength steel wire of excelling in fatigue property |
| KR102059095B1 (en) * | 2019-07-02 | 2019-12-24 | 홍덕산업(주) | Steel wire having excellent straightness quality and manufacturing method thereof |
| CN114054500B (en) * | 2021-11-11 | 2024-04-23 | 南通开发区升阳金属制品有限公司 | Preparation method of high-carbon steel high-strength filament |
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Denomination of invention: Manufacturing method of straight drawn wire rod for high carbon steel filament Effective date of registration: 20210901 Granted publication date: 20130904 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: INSTITUTE OF RESEARCH OF IRON & STEEL, JIANGSU PROVINCE/SHA-STEEL, Co.,Ltd. Registration number: Y2021980008699 |
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