CN100355925C - Micro-alloying production for 82B wire rod of steel strand - Google Patents

Micro-alloying production for 82B wire rod of steel strand Download PDF

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CN100355925C
CN100355925C CNB2004101554523A CN200410155452A CN100355925C CN 100355925 C CN100355925 C CN 100355925C CN B2004101554523 A CNB2004101554523 A CN B2004101554523A CN 200410155452 A CN200410155452 A CN 200410155452A CN 100355925 C CN100355925 C CN 100355925C
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wire rods
percent
wire rod
temperature
steel
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CN1778981A (en
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王全礼
李永东
李飞
章军
曾立
艾沛龄
张兴利
车金萍
周德
王彦锋
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Shougang Group Co Ltd
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Shougang Corp
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Abstract

The present invention relates to a microalloying method for producing 82B wire rods for steel strands by using continuous casting small square billets, which comprises ladle deoxidizing alloying and LF furnace refining. The utility model is characterized in that high carbon ferro-chrome is added 20 minutes before tapping of molten steel, and fine adjustment is performed in the LF furnace; ferrovanadium is added when one third of the process of the tapping of the molten steel is performed; adding quantities of microalloy are particularly as follows: 0.30 to 0.43 percent of Cr, 0.02 to 0.08 percent of V, 0.77 to 0.81 percent of C, and 0.80 to 0.90 percent of Mn. The present invention rewrites the history that the wire rods for 1860 to 2000MPa of steel strands can not be produced by using the continuous casting small square billets on a Stelmo cold control line. The produced wire rods have the advantage of stable structure property. The average sheet layer spacing of the produced wire rods is 0.18 mu m, the average diameter of pearlite pellets is 8.4 mu m, the tensile strength of phi 12.5mm wire rods for drawing 1860MPa of steel strands is from 1160 to 1220MPa, the reduction of area of the phi 12.5mm wire rods is from 30 to 36 percent, the tensile strength of phi 13.0mm wire rods for drawing 2000MPa of steel strands is from 1200 to 1260MPa, and the reduction of area of the phi 13.0mm wire rods is from 29 to 34 percent.

Description

Produce the microalloying method of steel strand with the 82B wire rod
Affiliated field
The invention belongs to field of iron and steel, mainly be applicable to and produce φ 15.24mm 1860-2000MPa steel strand with φ 11-14mm SWRH82B, hereinafter to be referred as the 82B wire rod.
Background technology
φ 15.24mm1860-2000MPa steel strand are wire fabrications that intensity rank is the highest, technology content is the highest in the present material of construction, are used widely in Important Project such as large high-speed railway, highway, bridge, roof truss, crane girder and Highrise buildings.In recent years, along with the fast development of Chinese national economy, market outlook are boundless.The 1860-2000MPa steel strand adopt φ 11mm~φ 14.0mm82B wire rod to make raw material, wire rod initial tensile strength requirement 〉=1150MPa, reduction of area 〉=28%.Process 8-9 road is drawn into the steel wire of φ 5.05,5.25mm, and plying is twisted into steel strand then, and twisted wire tensile strength rank is divided into 1860MPa and 2000MPa.
One of main difficult point of producing the 82B wire rod is: under certain control cool condition, select suitable chemical ingredients for use, obtain being fit to the cold deformation amount and reach sorbite tissue more than 80%.Produce this product at present both at home and abroad and adopt high-end devices, the air quantity that rolls the blower fan of back stelmor control cold line is 15.4-18 ten thousand m 3/ h, speed of cooling can reach 12-15 ℃/s.Its chemical ingredients of producing that 82B adopted is: 0.82-0.84%C, 0.70-0.80%Mn, 0.17-0.23%Cr.The present invention be directed to common production equipment: continuous caster has only the crystallizer induction stirring, the 130mm continuous cast billet, and standard stelmor control cold line, its fan delivery only is 8.3 ten thousand m 3/ h, speed of cooling is 5-8 ℃/S, this appointed condition is considered to produce the 82B wire rod.According to 82B wire rod handling characteristics, a kind of new chemical ingredients and the related production technology that reach its use properties have been invented, can produce device fabrication by enough ordinary students, emphasis is Cr, V microalloying method, following principle is followed in the selection of its chemical ingredients: (1) reduces transformation temperature by microalloying, and the refinement slices interlamellar spacing is to 0.10-0.20 μ m; (2) wire rod tissues such as bainite, martensite can not occur under the condition of maximum cooling rate, upper limit composition; (3) tensile strength 〉=1150MPa of wire rod, reduction of area 〉=28%.
Summary of the invention
The object of the present invention is to provide a kind of microalloying method, on common production equipment, produce high value added product with continuous cast billet production 1860~2000 MPa steel strand usefulness 82B wire rod.By adding appropriate C r, V amount, reduce perlite pelletizing diameter, reduce transformation temperature, obtain being fit to the pearlite interlaminar spacing of drawing, improve the tensile strength of wire rod, improve the plasticity and the drawing property of wire rod.
The present invention relates to a kind of microalloying method of producing steel strand with the 82B wire rod, wherein the Chemical Composition of steel (weight percent) is: C:0.77-0.81%, Mn:0.80-0.90%, P:0.009-0.018%, S:0.004-0.011%, Si:0.19-0.29%, all the other are Fe, microalloying comprises the ladle deoxidation alloying, the refining of LF stove, tap and added high carbon ferro-chrome in preceding 20 minutes, and in the LF stove, finely tune, tap and added vanadium iron at 1/3 o'clock, the microalloy add-on is specific as follows: Cr:0.30-0.43%, V:0.02-0.08%, C:0.77-0.81%, Mn:0.80-0.90%; Start rolling temperature is more than 1000 ℃, guarantee Cr, V element solid solution, finishing temperature is 1000-1040 ℃, two stage water-cooleds after rolling will evenly be cooled off, temperature is 880-920 ℃ after first section water-cooled, and laying temperature is 810-850 ℃, and air-cooled speed is 5-8 ℃/s, air-cooled final cooling temperature is 600-570 ℃, afterwards slowly cooling.
The invention has the beneficial effects as follows: only add 0.20%Cr to produce 82B different with advanced person's the powerful air-cooled technology 12-14 ℃/s in back that rolls, the present invention is under the cooling rate of 5-8 ℃/s, the left and right sides Cr of adding 0.37% makes the average phase change temperature drop to 618.5 ℃ by 633.5 ℃, and average sheet interlayer spacing has dropped to 0.15 μ m by 0.24 μ m.Under cooling of standard stelmor and winter conditions, Cr content reaches at 0.43% o'clock, the M tissue do not occur.
The effect that adds V is as follows: (1) has improved the intensity of wire rod by precipitation strength, per 0.01% V raising intensity 10-15MPa:(2) fixing nitrogen in steel 25-30ppm, reduced the nomadic nitrogen content in the steel; (3) tiny V precipitate has formed hydrogen trap, has improved the anti-breaking property of delaying of wire rod.
The present invention has rewritten with continuous cast billet can not produce the 1860MPa steel strand with the history of wire rod with successfully develop more high intensity levels Zhao 2000MPa steel strand wire rod at standard stelmor control cold line.
Embodiment
The present invention can implement in Steel Complex, is that Shoudu Iron and Steel Co the 3rd steelworks-high-speed wire factory is produced the 82B wire rod below
Operational path is: desulfurizing iron is skimmed → three steel-making 80t converter smelting → pushing off the slag tapping → ladle deoxidation alloying → ladle slag upgrading → LF ladle refinings → hello the Si-Ca line → steel ladle bottom argon blowing soft blow → 130mm2 square billet casting machine → rolling ∮ 12~14mm of cc billet surface quality inspection → high-speed rod-rolling mill wire rods → standard stelmor control cold line cooling → finished product packing after rolling.
Tapping added high carbon ferro-chrome in preceding 20 minutes, and finely tuned in the LF stove, and tapping added vanadium iron at 1/3 o'clock, and the microalloy add-on is specific as follows: Cr:0.30-0.43%, V:0.02-0.08%, C:0.77-0.81%, Mn:0.80-0.90%.Start rolling temperature is more than 1000 ℃, guarantees Cr, V element solid solution.Finishing temperature is 1000-1040 ℃, and two stage water-cooleds after rolling will evenly be cooled off, and temperature is 880-920 ℃ after first section water-cooled, and laying temperature is 810-850 ℃.Air-cooled speed is 5-8 ℃/s, and air-cooled final cooling temperature is 600-570 ℃, afterwards slowly cooling.The wire rod structure property of being produced is stable, average sheet interlayer spacing is 0.18 μ m, average perlite pelletizing diameter is 8.4 μ m, the tensile strength of φ 12-12.5mm wire rod is 1160-1220MPa, reduction of area is 30-36%, be better than customer requirements tensile strength 〉=1150MPa, reduction of area 〉=28% is used for draw 1860MPa steel strand.φ 13.0? 4.0mm the tensile strength of wire rod is 1200-1260MPa, reduction of area is 29-44%, is used for draw 2000MPa steel strand, has satisfied customer requirements.
Because seasonal variation, variation has also taken place in the speed of cooling of wire rod, has worked out the Cr content span of control in different months for this reason, and is as shown in the table.
The Cr content in different months, %
Month 1、2、3、11、12 All the other months
1860MPa 82B wire rod 0.30-0.37 0.34-0.41
2000MPa 82B wire rod 0.34-0.41 0.37-0.43
Following table is the quality in kind that Shoudu Iron and Steel Co is produced φ 13mm82B wire rod.
Month Lot number Heat (batch) number Chemical ingredients, % Tensile strength MPa Reduction of area %
C Si Mn P S Cr V
July 7-1130 3D6304 3D6305 3F6602 3F6603 3F6604 3F6607 3F6606 3F6606 3F6605 0.78 0.79 0.78 0.79 0.80 0.79 0.81 0.81 0.78 0.21 0.20 0.21 0.19 0.21 0.23 0.23 0.23 0.21 0.80 0.83 0.82 0.78 0.82 0.82 0.83 0.83 0.83 0.013 0.018 0.012 0.014 0.013 0.009 0.010 0.010 0.011 0.007 0.006 0.004 0.011 0.005 0.009 0.006 0.006 0.008 0.38 0.37 0.40 0.37 0.37 0.39 0.38 0.38 0.39 0.080 0.065 0.069 0.069 0.070 0.067 0.068 0.068 0.070 1240 1250 1260 1250 1260 1260 1260 1260 1260 30
7-1131 29
7-1132 31
7-1133 32
7-1134 30
7-1135 34
7-1136 30
7-1202 30
7-1203 31
Mean value 0.792 0.81 0.78 0.213 0.23 0.19 0.818 0.83 0.78 0.012 0.018 0.009 0.069 0.011 0.004 0.381 0.4 0.37 0.0696 0.08 0.065 1256 1260 1240 30.8
Maximum value 34
Minimum value 29
Following table is the quality in kind that Shoudu Iron and Steel Co is produced φ 12.5mm82B wire rod.
Month Lot number Heat (batch) number Chemical ingredients, % Tensile strength Reduction of area %
C Si Mn P S Cr MPa
February 2-1327 3F1758 3E1721 3F1709 3D1306 3F1815 3F1814 3F1812 3D1349 3D1348 3E1759 3F1757 3D1344 3D1343 3E7955 3F8021 3D7488 3D7483 3F7793 3F7792 3D6603 3D6602 3E6756 3E6749 3F6858 0.77 0.8 0.8 0.77 0.78 0.79 0.81 0.79 0.8 0.81 0.77 0.79 0.8 0.79 0.77 0.79 0.79 0.80 0.80 0.79 0.78 0.81 0.77 0.78 0.21 0.2 0.2 0.24 0.22 0.21 0.21 0.21 0.21 0.22 0.22 0.22 0.23 0.21 0.19 0.22 0.23 0.23 0.23 0.22 0.20 0.21 0.22 0.29 0.84 0.82 0.81 0.83 0.82 0.79 0.81 0.8 0.81 0.81 0.84 0.81 0.81 0.81 0.79 0.83 0.87 0.84 0.84 0.86 0.85 0.83 0.80 0.85 0.013 0.010 0.014 0.013 0.017 0.014 0.013 0.013 0.012 0.014 0.016 0.015 0.014 0.013 0.013 0.018 0.014 0.010 0.010 0.018 0.012 0.015 0.014 0.010 0.009 0.006 0.006 0.007 0.007 0.009 0.010 0.006 0.007 0.008 0.008 0.008 0.007 0.007 0.007 0.006 0.007 0.006 0.006 0.007 0.006 0.011 0.008 0.006 0.32 0.31 0.32 0.33 0.31 0.3 0.31 0.30 0.30 0.30 0.33 0.33 0.34 0.36 0.35 0.37 0.37 0.37 0.37 0.36 0.38 0.36 0.38 0.36 1190 1200 1170 1160 1170 1170 1180 1190 1160 1160 1190 1180 1190 1185 1190 1210 1200 1220 1195 1200 1190 1180 1180 1160 31
2-1328 32
2-1329 34
2-1330 34
2-1331 36
2-1332 36
2-1333 31
2-1334 30
2-1335 35
2-1336 35
2-1337 33
2-1338 32
2-1339 32
7,8, September 9-147 32
9-148 32
8-1325 33
8-1326 32
8-1327 30
8-1328 32
7-1536 35
7-1537 30
7-1538 31
7-1540 34
7-1541 34
Mean value 0.79 0.81 0.22 0.29 0.82 0.87 0.014 0.18 0.007 0.11 0.34 0.38 1184 1220 33
Maximum value 36
Minimum value 0.77 ?0.19 ?0.79 ?0.1 ?0.06 ?0.30 1160 30

Claims (1)

1, a kind of microalloying method of producing steel strand with the 82B wire rod, wherein the Chemical Composition weight percent of steel is: C:0.77-0.81%, Mn:0.80-0.90%, P:0.009-0.018%, S:0.004-0.011%, Si:0.19-0.29%, all the other are Fe, microalloying comprises the ladle deoxidation alloying, the refining of LF stove, it is characterized in that: tapping added high carbon ferro-chrome in preceding 20 minutes, and in the LF stove, finely tune, tap and added vanadium iron at 1/3 o'clock, the microalloy add-on is specific as follows: Cr:0.30-0.43%, V:0.02-0.08%, C:0.77-0.81%, Mn:0.80-0.90%; Start rolling temperature is more than 1000 ℃, guarantee Cr, V element solid solution, finishing temperature is 1000-1040 ℃, two stage water-cooleds after rolling will evenly be cooled off, temperature is 880-920 ℃ after first section water-cooled, and laying temperature is 810-850 ℃, and air-cooled speed is 5-8 ℃/s, air-cooled final cooling temperature is 600-570 ℃, afterwards slowly cooling.
CNB2004101554523A 2004-11-17 2004-11-17 Micro-alloying production for 82B wire rod of steel strand Active CN100355925C (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101245432B (en) * 2007-07-06 2011-01-26 天津钢铁有限公司 Technique for producing wire rod for low carbon drawn wire
CN101597676B (en) * 2009-07-03 2010-09-22 首钢总公司 Method for solving differences between the center of larger-size 82B wire rod and the edging tissue thereof
CN101831522A (en) * 2010-04-21 2010-09-15 首钢水城钢铁(集团)有限责任公司 Compound strengthening production method of high-strength steel wire rods for steel strands
CN102808131A (en) * 2012-07-27 2012-12-05 南京钢铁股份有限公司 Method for manufacturing high-quality high-strength cold forging steel with uniform texture performance
CN102796950A (en) * 2012-08-08 2012-11-28 内蒙古包钢钢联股份有限公司 Production method of large-scale high strength 82B high-carbon hard wire rod
CN102788748B (en) * 2012-09-05 2016-02-10 天津钢铁集团有限公司 The preparation method of 82B wire rod sorbite percentage analysis standard model
CN105838981A (en) * 2016-05-20 2016-08-10 金轮针布(江苏)有限公司 Steel for card clothing
CN108611572A (en) * 2018-05-11 2018-10-02 鞍钢股份有限公司 A kind of high-ductility hypereutectoid steel spring plate and its production method
CN112301287A (en) * 2020-11-09 2021-02-02 江苏省沙钢钢铁研究院有限公司 Prestressed steel strand, wire rod for prestressed steel strand and production method of wire rod

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1184718A (en) * 1996-12-10 1998-06-17 鞍山钢铁集团公司 Process for producing steel wire being used to produce tyre steel cord

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1184718A (en) * 1996-12-10 1998-06-17 鞍山钢铁集团公司 Process for producing steel wire being used to produce tyre steel cord

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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

Patentee after: Shougang Group Co. Ltd.

Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

Patentee before: Capital Iron & Steel General Company

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