CN104651724A - Coil rod for pre-stressed steel strand and production method of coil rod - Google Patents
Coil rod for pre-stressed steel strand and production method of coil rod Download PDFInfo
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Abstract
The invention discloses a coil rod for a pre-stressed steel strand and a production method of the coil rod. The production method comprises the following steps: smelting in a rotary furnace; refining in an LF; continuously casting; heating; carrying out controlled rolling and controlled cooling. In the continuous casting step, a casting blank consists of the following chemical components in percentage by weight:0.78-0.82 percent of C, 0.20-0.25 percent of Si, 0.75-0.80 percent of Mn, 0.20-0.25 percent of Cr, smaller than or equal to 0.012 percent of P, smaller than or equal to 0.010 percent of S and 0.02-0.03 percent of V. The controlled rolling and controlled cooling step comprises steps of rolling, spinning, cooling and collecting and coiling; in the rolling step, the rolling temperature is 1000+/-15 DEG C; the precision rolling temperature is 920 to 950 DEG C; in the spinning step, the spinning temperature is 860 to 880 DEG C. According to the method, based on optimization and control of the chemical components, by regulating and controlling the steel rolling process, the sorbite rate of the coil rod is increased, the interlamellar spacing of the sorbite is reduced, and generation of poor tissues is avoided, so that the coil rod has the characteristics of high intensity, high plasticity and low pole difference and satisfies the use requirement that the wire is not broken at a high-pulling speed; the pulling speed is increased; the wire breaking rate is reduced; therefore the production efficiency is improved to some degree.
Description
Technical field
The present invention relates to a kind of manufacture method of wire rod, especially a kind of production method of prestress wire wire rod.
Background technology
Prestress wire is the novel material of recent year high speed development, be widely used in railway engineering, Highrise buildings, across " large, high, heavy, special " important building Structural Engineerings such as river oblique pull bridge, suspension cable suspension bridge, water conservancy projects, Nuclear power plants dome, motion factory shop, offshore platforms, product application is extensive, good market prospect.
SWRH82B has good physical dimension and surface quality, more superior in metallographic structure, Decarburized layer and mechanical property, can be used to manufacture high-strength prestress steel strand, Stranded Galvanized Steel Wire etc., is the important source material of Steel Wire Products Industry deep processing.SWRH82B steel grade is the grade of steel that Japanese JIS standard specifies, is characterized in high-carbon, high strength, and requires good combination of strength and toughness, to meet the needs of user to steel cold drawing performance.
Current prestress wire wire rod is mainly based on SWRH82B, and what production technique adopted is traditional technology; Diameter is 12.5mm, tensile strength be the prestress wire wire rod of 1150MPa ~ 1200MPa when drawing, drawing speed general control is at 4.0m/s, if drawing speed is as easy as rolling off a log more than 4.0m/s cause drawing fracture of wire.
By the detection analysis of sample and the inspection to strand macrostructure of breaking to a large amount of drawing, think that the defect such as center segregation, shrinkage cavity of continuously cast bloom causes the major cause of the cone-shaped fracture of wire rod drawing.
Cool on Stanermo wind-cooling linear after prestress wire wire rod rolls, wire rod tissue by austenite to perlitic transformation.Pearlitic mechanical property depends primarily on pearlitic spacing, the pearlitic hardness of eutectoid steel and breaking tenacity reducing and increase all with sheet spacing.This is that viscous deformation occurs substantially in ferrite because perlite is when by force-extension, and cementite lamella then has the effect stoping slippage, and the ultimate range of slippage just equals sheet spacing.Sheet spacing is less, and the phase interface of ferrite and cementite is more, and the obstruction of On Dislocation Motion is also larger, and namely plastic deformation resistance increases, and thus hardness and intensity all increase, and the plasticity of lamellar pearlite also increases with the reduction of sheet spacing.Therefore, compared with sub-layers lamellar pearlite, there is higher Limited Plasticity, thus reflect there is larger relative reduction in area.In wire fabrication, generally wish that high-carbon steel wire rod has the lower nodular troostite tissue of transformation temperature, i.e. sorbite tissue.Sorbite tissue has higher intensity and good plasticity, and processing characteristics is excellent.Sorbitic rate is higher, the more applicable drawing of wire rod, and wire rod sorbite tissue lamellar spacing size evaluates an important evidence of wire rod tissue.
The pearlitic metallographic form of lamellar is that ferrite is alternately arranged into lamellar structure with cementite.The thickness of this tissue depends on pearlitic formation temperature.Condensate depression is larger, and transition temperature is lower, and perlite is thinner.The thickness of lamellar pearlite tissue can be weighed by sheet spacing, and the distance in pearlite colony between adjacent two panels cementite (or ferrite) is called pearlitic spacing.The size of sheet spacing depends primarily on pearlitic formation temperature, and along with condensate depression increases, austenitic transformation is that pearlitic temperature is lower, then sheet spacing is less.Show that phase transformation is when occurring for 600 DEG C ~ 650 DEG C according to lot of experimental data, wire rod obtains sorbite tissue, and its sheet interlayer spacing, between 0.10 ~ 0.30 μm, is suitable for wire rod drawing.
Summary of the invention
The technical problem to be solved in the present invention is not easy the prestress wire wire rod of fracture of wire under being to provide a kind of high drawing speed; The invention also discloses a kind of production method of prestress wire wire rod.
For solving the problems of the technologies described above, the weight proportion of the steel grade chemical composition that the present invention takes is: C0.78% ~ 0.82%, Si 0.20% ~ 0.25%, Mn 0.75% ~ 0.80%, Cr 0.20% ~ 0.25%, P≤0.012%, S≤0.010%, V 0.02% ~ 0.03%, and surplus is Fe.
The inventive method comprises converter smelting, the refining of LF stove, continuous casting, heating and controlled rolling and controlled cooling operation, in described continuous casting working procedure, the weight proportion of Chemical Composition in Cast Billet is: C 0.78% ~ 0.82%, Si 0.20% ~ 0.25%, Mn 0.75% ~ 0.80%, Cr 0.20% ~ 0.25%, P≤0.012%, S≤0.010%, V 0.02% ~ 0.03%, and surplus is Fe;
Described controlled rolling and controlled cooling operation comprises rolling, weaves silk, cools and collect volume operation; In described rolling process, start rolling temperature 1000 ± 15 DEG C, enters final rolling temperature 920 DEG C ~ 950 DEG C; Describedly weave silk in operation, laying temperature 860 DEG C ~ 880 DEG C.
Further, refrigerating work procedure described in the inventive method adopts Stanermo wind-cooling linear;
The air-cooled fan delivery of described stelmor is: 1# ~ 4# opens 90%, 5# ~ 10# opens 100%, 11# opens 90%, 12# ~ 14# opens 100%; Wherein 1# ~ 4# fan delivery is 200000m
3/ b, 5# ~ 14# fan delivery is 154700m
3/ b.
Further, the air-cooled air-cooled roller table speed of stelmor described in the inventive method is started to walk with 0.6m/s, and the speed of follow-up each air-cooled roller-way increases progressively with 103%.
Further, in rolling process described in the inventive method, 3# milling train temperature out >=935 DEG C.
Further, weave silk in operation described in the inventive method, drawing speed when weaving silk is 4.0 ~ 5.2m/s.
The beneficial effect adopting technique scheme to produce is: the present invention is by suitably reducing C content in steel, be equipped with M-EMS, end induction stirring and soft reduction technique, reduce the defects such as strand carbon segregation, shrinkage cavity and wire rod drawing is processed to the harm caused; Making up by increasing Cr content in steel the loss of strength reducing C content and bring, increasing micro alloying element V content simultaneously, playing crystal grain thinning, improving intensity and the plasticity comprehensive mechanical property index of wire rod; Reduce because composition fluctuates the weak point of the wire rod performance extreme difference caused by narrow chemical Composition Control; Have that sorbitic rate is high, sorbite sheet interlayer spacing is little, comprehensive mechanical property good, be not easy the feature of fracture of wire under high drawing speed.
The present invention is on the basis of optimal control chemical composition, improve wire rod sorbitic rate by adjusting and controlling steel rolling process, reduce sorbite sheet interlayer spacing, avoid producing harmful structure, finally realize the feature of prestress wire wire rod high strength, high-ductility and low extreme difference, meet the service requirements of not fracture of wire under high drawing speed, when drawing procedure cost need not be increased, can realize improve drawing speed, reduce wire broken rate, and then some improve production efficiency.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 ~ Fig. 4 is sorbite percentage of the present invention grading photo;
Fig. 5 ~ Fig. 8 is sorbite sheet interlayer spacing photo of the present invention;
Fig. 9 ~ Figure 12 is practical decarburized depth photo of the present invention.
Embodiment
This prestress wire production method of wire rod 80MnCr adopts following technological process: molten iron KR desulfurization pre-treatment → top and bottom combined blown converter → LF refining furnace → continuous caster casting (M-EMS+solidification end induction stirring+slighter compress) → Two-cuff Technique walking beam furnace heating → thick, in roll → pre-finish rolling → pre-water-cooled → high speed finish rolling → water-cooled → pinch, → stelmor temperature control loose coil colling → collection volume → packaging and warehousing of weaving silk.The technology controlling and process of its production process is as follows.
(1) molten iron and steel scrap require:
Steel making working procedure is before converter smelting, and require to control molten iron chemical composition according to relevant criterion, S≤0.050wt%, 0.25wt%≤Si≤0.60wt%, P≤0.100wt% before desulfurizing iron, requires molten iron temperature T >=1300 DEG C.After desulfurizing iron, desulfurization slag removes totally, bright of molten iron >=90%, S≤0.005wt%, 0.25wt%≤Si≤0.60wt%, molten iron temperature T >=1250 DEG C.Steel scrap will select heavy-duty waste steel, low-phosphorous, low-sulfur, dry, clean, lumpiness is suitable.
(2) converter smelting Working Procedure Controlling:
S≤0.005wt% after desulfurizing iron, rational proportion molten iron and steel scrap amount, stay slag double slag process to operate, and end point carbon, phosphorus, temperature three coordinate; Terminal composition (wt%) meets C >=0.20%, P≤0.012%, S≤0.010%.Accurately determine oxygen by revolving furnace sublance, determine carbon, improve molten steel and enter refining Composition Control precision, reduce the feed supplement in refining process, improve Molten Steel Cleanliness; Molten steel enters refining composition (wt%) control C:0.75% ~ 0.80%, Si:0.20%, Mn:0.75%, Cr:0.20%, P≤0.012%, S≤0.010%, V:0.02%.
(3) LF stove refining procedure:
Go out refining chemical composition and meet C:0.78% ~ 0.82%, Si:0.20% ~ 0.25%, Mn:0.75% ~ 0.80%, Cr:0.20% ~ 0.25%, P≤0.012, S≤0.010, V:0.02% ~ 0.03%, surplus is Fe.The fluctuation range going out refining composition linking heat carbon is no more than 0.01%, and the fluctuation range of manganese is no more than 0.03%.The soft blow time must ensure more than 30 minutes, and refining cycle is not less than 55 minutes.
(4) continuous casting working procedure:
Continuous casting working procedure chemical composition (wt%) meets C:0.78% ~ 0.82%, Si:0.20% ~ 0.25%, Mn:0.75% ~ 0.80%, Cr:0.20% ~ 0.25%, P≤0.012%, S≤0.010%, V:0.02% ~ 0.03%, surplus is Fe.Whole process takes molding casting, and strict implement constant speed draws steel degree, and continuous caster pulling rate is stabilized in 2.0m/min (section 150 × 150mm2); Molten steel overheat controls between 20 DEG C ~ 35 DEG C; M-EMS parameter (section 150 × 150mm2): frequency 4HZ, electric current 240A, end stirring parameter: frequency 5HZ, electric current 300A, slighter compress draught 5mm.
(5) heating process:
Enter stove steel billet must homogeneous heating, grill thoroughly, guarantee heating quality, the steel billet poker temperature difference≤30 DEG C of coming out of the stove, process furnace each section of temperature regulates with reference to following table.Heating steel billet is even, the nonaffine deformation that can reduce in the operation of rolling is grilled thoroughly in heart portion, thus reduces finished product wire rod internal stress, stablizes its mechanical property; The Heating temperature of each heating zone is in table 1.
Table 1: the Heating temperature of each heating zone
| Heating zone | Heat one section | Heat two sections | Soaking zone |
| Temperature DEG C | 500～900 | 880～950 | 1000～1060 |
(6) controlled rolling and controlled cooling operation:
Steel billet of coming out of the stove adopts high pressure water descaling device to be eliminated by iron oxide on surface of billet steel skin before the rolling, and concrete roll control parameter is in table 2.
Table 2: roll control parameter
In the rolling process of described controlled rolling and controlled cooling, start rolling temperature controls in 1000 ± 15 DEG C of fluctuation ranges, guarantees that rolling deformation is in suitable temperature range, and the too low resistance to deformation of temperature is large, is out of shape seriously uneven; Temperature too high austenite excessive grain is grown up, and causes the finished product grain coarsening, will worsen the comprehensive mechanical property of product.3# milling train temperature out can effectively weigh homogeneity inside and outside steel billet temperature, and a large amount of production data and practical experience show that this temperature and the start rolling temperature temperature difference control within 50 DEG C, and steel billet internal and external temperature gradient is minimum.Because in high-speed wire rolling process, finishing rolling step is the process of an intensification rolling, so in order to prevent grain coarsening, being strict with and controlling between 920 DEG C ~ 950 DEG C into final rolling temperature.
The refrigerating work procedure of described controlled rolling and controlled cooling adopts Stanermo wind-cooling linear, and 1# ~ 4# fan delivery of Stanermo wind-cooling linear is 200000m
3/ h (m
3/ h is fan delivery unit, represents that blower fan per hour produces the air quantity of 200000 cubic metres), 5# ~ 14# fan delivery is 154700m
3/ h.During 80MnCr rolling by 1# ~ 4# fan delivery being reached 90%, 5# ~ 10# fan delivery reaches 100%, 11# fan delivery reaches 90%, 12# ~ 14# fan delivery reaches 100%, improve sorbitic rate, reduce sorbite sheet interlayer spacing, thus improve the comprehensive drawing mechanical property of wire rod.Finish to gauge speed 75m/s, starts to walk with 0.6m/s by calculating air-cooled roller table speed, increases progressively and can ensure that the heat affecting in temperature field between air-cooled roller-way coil is reduced to minimum, thus drop to minimum by Stanermo wind-cooling linear inhomogeneous cooling with 103%.
In the rolling process of described controlled rolling and controlled cooling, water-cooled section temperature of cooling water≤32 DEG C.After rolling, finished product is coiled and will be sheared totally by defect parts such as head dehydration section, afterbody catcher marks; Air-cooled line produce steel of creeping all choose sentence useless; The defects such as wire rod surface should be smooth, and must not there be crackle, folding, cut, the ears or side handles of a utensil, projection, pitted skin in surface, scab; Final dimension performs GB/T 14981-2009, controls (permissible variation: ± 0.20mm, out of roundness≤0.32mm) by C level product; Wire rod timeliness after 10 days mechanical property should meet tensile strength 1150MPa ~ 1200MPa; Relative reduction in area >=32%.
Embodiment 1-8: this prestress wire wire rod 80MnCr adopts following concrete technology.
The composition proportion that each embodiment is concrete, processing condition, Product checking in table 3 ~ table 12, wherein: table 3 is converter terminal chemical composition, table 4 for refining enter the station that chemical composition, table 5 are refining departures chemical composition, table 6 is continuous casting data, table 7 is melting chemical composition, table 8 is finished product wire rod chemical composition, table 9 is operation of rolling temperature, table 10 is air-cooled roller table speed, table 11 is wire rod mechanical property result of sampling inspection, table 12 is for wire rod tissue sample detected result.
Table 3: converter terminal chemical composition
Table 4: refining is entered the station chemical composition
Table 5: refining departures chemical composition
Table 6: continuous casting data
Table 7: melting chemical composition
Table 8: finished product wire rod chemical composition
Table 9: operation of rolling temperature (DEG C)
Table 10: air-cooled roller table speed (m/s)
Table 11: wire rod mechanical property result of sampling inspection
Table 12: wire rod tissue sample detected result
| Embodiment | Sorbite percentage | Sorbite sheet interlayer spacing | Practical decarburized depth |
| 1 | 86％ | 0.13μm | Without obvious decarburization |
| 2 | 81％ | 0.16μm | Without obvious decarburization |
| 3 | 86％ | 0.18μm | 25 ~ 50 μm; (45% girth decarburization) |
| 4 | 87％ | 0.15μm | 25 ~ 50 μm; (25% girth decarburization) |
The diameter that present method is produced is the actual tensile strength of 80MnCr wire rod timeliness after 10 days of Φ 12.5mm is 1162MPa ~ 1179MPa, meets the tensile strength 1150MPa ~ 1200MPa of drawing processing request; After the 80MnCr wire rod of Φ 12.5mm is drawn to Φ 5.05mm, actual tensile strength is 1894MPa ~ 1954MPa, meets the requirement of final prestressing force steel strand tensile strength 1860MPa ~ 2000MPa; Bend and do not occur fracture of wire phenomenon >=10 times; 80MnCr wire rod drawing speed reaches 5.2m/s, and compared with traditional prestress wire wire rod SWRH82B drawing speed 4.0m/s, drawing speed improves 1.2m/s.
Fig. 1-4 is respectively the sorbite percentage grading photo of embodiment 1-4 gained 80MnCr wire rod, from Fig. 1-4, sorbite percentage is all greater than 80%, reaches more than industry mean level (ML), and the sorbite percentage of this ratio can well meet Downstream processing user user demand.Fig. 5-8 is respectively the sorbite sheet interlayer spacing photo of embodiment 1-4 gained 80MnCr wire rod, from Fig. 5-8, wire rod pearlitic structure sheet interlayer spacing is between 0.1 μm ~ 0.2 μm, belong to sorbite category, the crystalline structure of sorbite tissue and orientation relationship determine sorbite and have excellent cold-forming property, especially cold-drawn good mechanical properties, thinks that the wire rod of this sheet interlayer spacing is suitable for drawing processing thus.Fig. 9-12 is respectively the practical decarburized depth photo of embodiment 1-4 gained 80MnCr wire rod, from Fig. 9-12, the practical decarburized depth of embodiment 1 and 2 gained wire rod is 0 μm, the practical decarburized depth of embodiment 3 and 4 gained wire rod is 25 ~ 50 μm, all in all practical decarburized depth is all less than 1.0%D (wire rod diameter 12.5mm, calculate by GB/T 4354-2008), can downstream processing requirements be met.
Claims (6)
1. a prestress wire wire rod, it is characterized in that, the weight proportion of its steel grade chemical composition is: C 0.78% ~ 0.82%, Si 0.20% ~ 0.25%, Mn 0.75% ~ 0.80%, Cr 0.20% ~ 0.25%, P≤0.012%, S≤0.010%, V 0.02% ~ 0.03%, and surplus is Fe.
2. the production method of a prestress wire wire rod, it comprises converter smelting, the refining of LF stove, continuous casting, heating and controlled rolling and controlled cooling operation, it is characterized in that, in described continuous casting working procedure, the weight proportion of Chemical Composition in Cast Billet is: C 0.78% ~ 0.82%, Si 0.20% ~ 0.25%, Mn 0.75% ~ 0.80%, Cr 0.20% ~ 0.25%, P≤0.012%, S≤0.010%, V 0.02% ~ 0.03%, and surplus is Fe;
Described controlled rolling and controlled cooling operation comprises rolling, weaves silk, cools and collect volume operation; In described rolling process, start rolling temperature 1000 ± 15 DEG C, enters final rolling temperature 920 DEG C ~ 950 DEG C; Describedly weave silk in operation, laying temperature 860 DEG C ~ 880 DEG C.
3. the production method of prestress wire wire rod according to claim 2, is characterized in that, described refrigerating work procedure adopts Stanermo wind-cooling linear;
The air-cooled fan delivery of described stelmor is: 1# ~ 4# opens 90%, 5# ~ 10# opens 100%, 11# opens 90%, 12# ~ 14# opens 100%; Wherein 1# ~ 4# fan delivery is 200000m
3/ h, 5# ~ 14# fan delivery is 154700m
3/ h.
4. the production method of prestress wire wire rod according to claim 3, is characterized in that: the air-cooled air-cooled roller table speed of described stelmor is started to walk with 0.6m/s, and the speed of follow-up each air-cooled roller-way increases progressively with 103%.
5. the production method of prestress wire wire rod according to claim 2, is characterized in that: in described rolling process, 3# milling train temperature out >=935 DEG C.
6. the production method of the prestress wire wire rod according to claim 2-5 any one, is characterized in that: in the client's manufacturing procedure of described downstream, drawing speed is 4.0 ~ 5.2m/s.
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