CN101597713A - A kind of microalloying SWRH87B gren rod and manufacture method thereof - Google Patents
A kind of microalloying SWRH87B gren rod and manufacture method thereof Download PDFInfo
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- CN101597713A CN101597713A CNA2009100881484A CN200910088148A CN101597713A CN 101597713 A CN101597713 A CN 101597713A CN A2009100881484 A CNA2009100881484 A CN A2009100881484A CN 200910088148 A CN200910088148 A CN 200910088148A CN 101597713 A CN101597713 A CN 101597713A
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Abstract
A kind of microalloying SWRH87B gren rod and manufacture method thereof belong to the gren rod technical field.Adopt Cr, V microalloying; The double slag process catch carbon practice is adopted in converter, and end point carbon is controlled by 0.40～0.60%, 1580～1620 ℃ of tapping temperatures, pushing off the slag tapping; Adopt low nitrogen carburelant carburetting; Use the Si-Ca-Ba deoxidation; Every stove adds 600～800kg synthetic slag; Advance LF refining station control oxygen activity and be lower than 10ppm, refining finishing slag FeO+MnO sum is no more than 3%; The Ca-Si line is mingled with denaturing treatment; Adopt the little square billet of 160mm * 160mm, crystallizer mated ends induction stirring, reasonable secondary cooling system is adopted in continuous caster full guard, the casting of permanent pulling rate; Start rolling temperature is controlled at 1020～1150 ℃, is beneficial to the seam of shrinkage cavity, increases the probability of shrinkage cavity seam; Use pre-water-cooled and phase transformation strengthening cooling technology control tissue and performance.Advantage is, shortens the aging time of wire rod before following process; Tensile strength is greater than 1280MPa after the timeliness, and reduction of area is greater than 25%.
Description
Technical field
The invention belongs to the gren rod technical field, particularly relate to a kind of microalloying SWRH87B (High CarbonSteel Wire Rods 87B) gren rod and manufacture method thereof, be applicable to and produce Φ 18.9 and Φ 21.6mm intensity 1860MPa level steel strand and Φ 8～11mm bright steel wire Φ 13～16mm hot rolling SWRH87B wire rod.
Background technology
Prestress wire is widely used in the construction of Infrastructure such as mine, colliery, deep-water quay, motorway, high-speed railway, Highrise buildings, airport, use steel strand to replace regular reinforcement can increase the span of buildings, improve work-ing life, reduce construction costs.So this product speed that promotes the use at home is very rapid in recent years.The domestic consumption of this product was 100,000 tons in 2000, and demand reaches 2,500,000 tons up till now.Simultaneously, this updating and upgrading of a product is also very fast, from before 1670MPa develop into 2000MPa through 1770MPa, 1860MPa.Specification develops into Φ 17.8mm by original Φ 9.53mm, Φ 11.11mm, Φ 12.70mm, Φ 15.24mm.Along with the later stage of exploitation has been arrived in domestic most mine, colliery, underground darker position is extended at the top, tunnel of exploitation.The tunnel proposes higher requirement to the safety coefficient of top shield, to resist the significant shear stress that the different rock-layers structure produces when the changing of the relative positions takes place.There has been demand in large-scale mine and colliery to the steel strand of Φ 18.9 and Φ 21.6mm specification.At present, the SWRH82B that other steel strand raw material of making diameter of phi 17.8mm intensity 1860MPa level is diameter 13mm, wire rod tensile strength remains on more than the 1200MPa.Make the steel strand of Φ 18.9 and Φ 21.6mm specification, diameter of phi 13mm wire rod green strength is not less than 1250MPa, and SWRH82B wire rod originally can not satisfy this requirement.Need a kind of wire rod higher of exploitation to meet the demands and make the requirement of bigger gauge steel twisted wire than SWRH82B tensile strength, for improving the tensile strength of wire rod, traditional technological line is to add alloy such as V on the basis of SWRH82B composition, utilize solid molten reinforcement of V to improve intensity, increased the production cost of wire rod with precipitation strength.
Chinese patent ZL200410155452.3 adopts converter smelting, the refining of LF stove, the 130mm * little square billet of 130mm section, crystallizer induction stirring, and standard stelmor control cold line, its air quantity only are 83000m
3/ h, speed of cooling only is under 5～8 ℃ the condition, can produce other steel strand of Φ 15.24mm intensity 1860MPa level in batches with Φ 12～14mm specification wire rod.And under this appointed condition, produce Φ 18.9 and Φ 21.6mm intensity 1820MPa level steel strand with big specification Φ 13～16mm gren rod report not.On the Chinese patent ZL200410155452.3 technical foundation, adopting 130mm * 130mm continuous small-billet casting explained hereafter tensile strength is Φ 12～14mm gren rod greater than 1150MPa rank specification, is mainly used in to make Φ 15.24mm1860MPa steel strand.Its main wire rod specification is the 12.5mm wire rod, and cold working is drawn into Φ 5.05 and 5.25mm by Φ 12.5mm, and intensity reaches 1900～1960MPa.The Φ 13mm wire rod of producing can only be made 15.24mm intensity 1860MPa level steel strand.
Summary of the invention
The object of the present invention is to provide a kind of microalloying SWRH87B gren rod and manufacture method thereof, require to be controlled at the characteristics that 1250Mpa requires at making the used former wire rod of big gauge steel twisted wire, by the C among the SWRH82B is brought up to 0.85～0.89% by former 0.79～0.82%, design a kind of new SWRH87B steel grade.
The one-tenth of gren rod of the present invention is grouped in quality %, C:0.83～1.00%, Si:0.15～0.35%, Mn:0.6～0.9%, Cr:0～0.50%, V:0～0.15%, surplus: Fe.
This manufacture method: adopt production 18.9 of 160mm * 160mm continuously cast bloom and cooling controlling and rolling controlling process and 21.6mm intensity 1860MPa level steel strand SWRH87B gren rod with Φ 13～16mm specification; comprise that desulfurizing iron skims → converter smelting → pushing off the slag tapping → ladle deoxidation and alloying → ladle slag upgrading → LF ladle refining → feed the Si-Ca line → little square billet full guard of steel ladle bottom argon blowing soft blow → 160mm * 160mm casting → crystallizer mated ends induction stirring → heating → controlled rolling → controlled chilling, in technological process, control following processing parameter:
Double-slag operation is adopted in converter, and end point carbon is controlled by 0.40～0.60%, 1580～1620 ℃ of tapping temperatures, and the pushing off the slag tapping, the following slag thickness in the control converter tapping process is no more than 50mm;
Adopt low nitrogen carburelant carburetting, use the Si-Ca-Ba deoxidation, add-on 1.5～2.5kg/t steel, every stove adds 600～800kg synthetic slag;
Advance LF refining station control oxygen activity and be lower than 10ppm, refining finishing slag FeO+MnO sum is no more than 3%;
Feed the Ca-Si line and be mingled with denaturing treatment; The soft blow time guarantees more than 15 minutes, makes to be mingled with come-up to greatest extent in the steel;
The average superheating temperature of control tundish molten steel is not higher than 20 ℃, adopts permanent pulling rate full guard casting, adopts stronger 1.2L/kg two cold specific waters, cooperates crystallizer mated ends induction stirring to reduce strand center carbon segregation and shrinkage cavity;
160mm * 160mm continuous small-billet casting; crystallizer adopts the induction stirring of 300A, 5Hz; terminal 400A, the 5Hz induction stirring of adopting; adopt the big covering agent of high basicity; big bag argon envelope, the omnidistance Argon of tundish, the casting of submerged nozzle full guard; cast is according to the permanent pulling rate control of 1.8m/min, tundish molten steel overheat≤25 ℃, and continuous casting two cold adopts the 1.2L/Kg specific water to pour into a mould.
Adopt suitable start rolling temperature, start rolling temperature is controlled at 1020～1150 ℃, is beneficial to the seam of shrinkage cavity, increases the probability of shrinkage cavity seam; Use pre-water-cooled and phase transformation strengthening cooling technology control tissue and performance.
Employing is online after by the wire rod phase transformation to be incubated wire rod, shortens the aging time of wire rod before following process.
Wire rod of the present invention is used to make Φ 18.9 and Φ 21.6mm intensity 1820MPa level steel strand and Φ 8～11mm bright steel wire.
Between wire rod Φ 13～16mm of the present invention, tensile strength is greater than 1280MPa after the wire rod timeliness, and reduction of area is greater than 25%.
The present invention has successfully opened up strip adoption 160mm * 160mm continuous cast billet and has produced Φ 18.9 and Φ 21.6mm intensity 1820MPa level steel strand Φ 13～16mm specification SWRH87B gren rod processing technology routine, the wire rod of producing is superior in quality, formed batch process, the user uses well, remarkable benefit.
Embodiment
The present invention can implement in Steel Complex, is Shoudu Iron and Steel Co second steelworks-Shoudu Iron and Steel Co first high-speed wire factory below, the example that adopts this invention to produce.
Operational path is: desulfurizing iron is skimmed → two steel-making 210t converter smelting → converter pushing off the slag tapping → ladle deoxidation alloying → LF ladle refinings → hello the Si-Ca line → steel ladle bottom argon blowing soft blow → 160mm * 160mm billet caster → cc billet surface quality inspection → rolling Φ 13～16mm of heating → high-speed rod-rolling mill wire rod → controlled chilling → finished product packings.
Table 1 converter smelting main technologic parameters
| Heat | Go into the stove molten iron | The converter terminal temperature | Converter terminal | Si-Mn，kg | Mn-Fe，kg | Cr-Fe，kg | Si-Ca-Ba，kg |
| S，％ | Degree, ℃ | C，％ | |||||
| 8A04945 | 0.045 | 1613 | 0.47 | 880 | 1000 | 900 | 300 |
| 8B05472 | 0.040 | 1620 | 0.50 | 900 | 1000 | 950 | 280 |
| 8A04940 | 0.028 | 1617 | 0.42 | 880 | 1000 | 900 | 320 |
| 8A04939 | 0.046 | 1599 | 0.60 | 910 | 1000 | 950 | 320 |
| 8B05456 | 0.038 | 1603 | 0.55 | 900 | 1000 | 900 | 300 |
Table 2 refining main technologic parameters
| Heat | Argon gas NL/min (in earlier stage) | Argon gas NL/min (heating) | Argon gas NL/min (soft blow) | Submerged arc slag, Kg | Synthetic slag, Kg | Activity oxygen, ppm |
| 8A04945 | 510 | 300 | 100 | 300 | 1100 | 6 |
| 8B05472 | 490 | 330 | 90 | 250 | 900 | 5 |
| 8A04940 | 510 | 320 | 110 | 300 | 800 | 3 |
| 8A04939 | 520 | 340 | 120 | 280 | 900 | 6 |
| 8B05456 | 500 | 320 | 120 | 300 | 900 | 3 |
Table 3 casting parameters
| Heat | In bag temperature ℃ | Water yield L/min | Pulling rate m/min | Start rolling temperature, ℃ | Go out final rolling temperature, ℃ | Laying temperature, ℃ |
| 8A04945 | 1515 | 1657 | 2.65 | 1100 | 930 | 830 |
| 8B05472 | 1507 | 1659 | 2.64 | 1090 | 950 | 860 |
| 8A04940 | 1510 | 1709 | 2.60 | 1100 | 940 | 830 |
| 8A04939 | 1514 | 1654 | 2.60 | 1150 | 960 | 850 |
| 8B05456 | 1504 | 1658 | 2.65 | 1100 | 930 | 850 |
Table 4 rolling technological parameter
Table 5 finished product composition and stocking performance
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ | σ b，MPa | Ψ，％ |
| 8A04945 | 0.87 | 0.22 | 0.81 | 0.015 | 0.008 | 0.23 | 1320 | 34.5 |
| 8B05472 | 0.86 | 0.21 | 0.80 | 0.010 | 0.004 | 0.22 | 1280 | 43 |
| 8A04940 | 0.88 | 0.23 | 0.81 | 0.008 | 0.005 | 0.25 | 1290 | 34.5 |
| 8A04939 | 0.87 | 0.21 | 0.82 | 0.012 | 0.006 | 0.21 | 1310 | 37 |
| 8B05456 | 0.88 | 0.21 | 0.81 | 0.013 | 0.007 | 0.22 | 1290 | 40.5 |
The wire rod that adopts above-mentioned processing method to produce, steady quality is issued the user and is used, and reflection is good.
Embodiment 1: heat (batch) number 8B05481
Converter smelting, 179 tons of raw material molten iron add-ons, 20.2 tons of conversion pigs, 4.5 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm
2, oxygen supply time 13 minutes and 35 seconds; Lime adding amount 7900kg, light dolomite 1664kg; Ore deposit 1761kg difficult to understand; End point carbon: 0.45%, phosphorus: 0.013%; 1613 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 300kg, silicomanganese 880kg, ferromanganese 1000kg, carbon ferrochrome 950kg.
The LF refining furnace, argon gas early stage, flow was 510NL/min, mid-term flow 300NL/min, later stage argon flow amount 100NL/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 5.7ppm.
1485 ℃ of middle bag temperature, crystallizer water yield 1657L/min, pulling rate 1.85/min.
Start rolling temperature: 1080 ℃, go out final rolling temperature: 940 ℃, laying temperature: 880 ℃, wire rod tensile strength: 1280MPa, reduction of area 34.5%.
Embodiment 2: heat (batch) number 8A04945
Converter smelting, 117 tons of raw material molten iron add-ons, 20.9 tons of conversion pigs, 4.7 tons of steel scraps, oxygen supply work oxygen is pressed 7.5kg/cm
2, oxygen supply time 11 minutes and 33 seconds.Lime adding amount 13980kg, light dolomite 240kg; Ore deposit 4.28kg difficult to understand; End point carbon: 0.52%, phosphorus: 0.013%; 1590 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 300kg, silicomanganese 900kg, ferromanganese 1000kg, carbon ferrochrome 1000kg.
The LF refining furnace, argon gas early stage, flow was 490NL/min, mid-term flow 330NL/min, later stage argon flow amount 30NL/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 9ppm.
1480 ℃ of middle bag temperature, crystallizer water yield 1659L/min, pulling rate 2.65/min.
Start rolling temperature: 1070 ℃, go out final rolling temperature: 930 ℃, laying temperature: 860 ℃, wire rod tensile strength: 1290MPa, reduction of area 35%.
Embodiment 3: heat (batch) number 8B05468
Converter smelting, 176 tons of raw material molten iron add-ons, 15.3 tons of conversion pigs, 20.6 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm
2, oxygen supply time 12 minutes and 23 seconds.Lime adding amount 12600kg, light dolomite 330kg; Ore deposit 3070kg difficult to understand; End point carbon: 0.57%, phosphorus: 0.01%; 1600 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 330kg, silicomanganese 920kg, ferromanganese 1550kg, carbon ferrochrome 1000kg.
The LF refining furnace, argon gas early stage, flow was 520NL/min, mid-term flow 330NL/min, later stage argon flow amount 90NL/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 12ppm.
1479 ℃ of middle bag temperature, crystallizer water yield 1657L/min, pulling rate 1.65/min.
Start rolling temperature: 1090 ℃, go out final rolling temperature: 940 ℃, laying temperature: 880 ℃, wire rod tensile strength: 1310MPa, reduction of area 37.5%.
Embodiment 4: heat (batch) number 8B05450
Converter smelting, 183 tons of raw material molten iron add-ons, 15 tons of conversion pigs, 10 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm
2, oxygen supply time 13 minutes and 32 seconds; Lime adding amount 13570kg, fluorite 200kg; Ore deposit 1940kg difficult to understand; End point carbon: 0.47%, phosphorus: 0.017%; 1590 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 300kg, silicomanganese 1000kg, ferromanganese 1000kg, carbon ferrochrome 864kg.
The LF refining furnace, argon gas early stage, flow was 540NL/min, mid-term flow 350NL/min, later stage argon flow amount 100NL/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 4.7ppm.
1480 ℃ of middle bag temperature, crystallizer water yield 1657L/min, pulling rate 2.60/min.
Start rolling temperature: 1090 ℃, go out final rolling temperature: 920 ℃, laying temperature: 880 ℃, wire rod tensile strength: 1290MPa, reduction of area 39.5%.
Claims (2)
1, a kind of microalloying SWRH87B gren rod, it is characterized in that: the one-tenth of described gren rod is grouped in quality %, C:0.83～1.00%, Si:0.15～0.35%, Mn:0.6～0.9%, Cr:0～0.50%, V:0～0.15%, surplus: Fe.
2; a kind of method of making the described microalloying SWRH87B of claim 1 gren rod; adopt production 18.9 of 160mm * 160mm continuously cast bloom and cooling controlling and rolling controlling process and 21.6mm intensity 1860MPa level steel strand SWRH87B gren rod with Φ 13～16mm specification; comprise that desulfurizing iron skims → converter smelting → pushing off the slag tapping → ladle deoxidation and alloying → ladle slag upgrading → LF ladle refining → feed the Si-Ca line → little square billet full guard of steel ladle bottom argon blowing soft blow → 160mm * 160mm casting → crystallizer mated ends induction stirring → heating → controlled rolling → controlled chilling, in technological process, control following processing parameter:
Double-slag operation is adopted in converter, and end point carbon is controlled by 0.40～0.60%, 1580～1620 ℃ of tapping temperatures, and the pushing off the slag tapping, slag thickness is no more than 50mm under the control converter;
Adopt low nitrogen carburelant carburetting, use the Si-Ca-Ba deoxidation, add-on 2～2.5kg/t steel, every stove adds 600～800kg synthetic slag;
Advance LF refining station control oxygen activity and be lower than 10ppm, refining finishing slag FeO+MnO is no more than 3%;
Feed the Ca-Si line and be mingled with denaturing treatment; The soft blow time guarantees more than 15 minutes, makes to be mingled with come-up to greatest extent in the steel;
The average superheating temperature of control tundish molten steel is not higher than 20 ℃, adopts permanent pulling rate full guard casting, adopts 1.2L/kg two cold specific waters, cooperates crystallizer mated ends induction stirring to reduce strand center carbon segregation and shrinkage cavity;
Start rolling temperature is controlled at 1020～1150 ℃, is beneficial to the seam of shrinkage cavity, increases the probability of shrinkage cavity seam.
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