CN106170566A - Welding calcium core-spun yarn and the application process in liquid steel refining thereof - Google Patents
Welding calcium core-spun yarn and the application process in liquid steel refining thereof Download PDFInfo
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Abstract
A kind of weld calcium core-spun yarn and the application process in liquid steel refining thereof.Welding calcium core-spun yarn, is the seamless box hat parcel solid calcium heart yearn being welded by high frequency induction welding connection and the wire body of diameter 8～10mm formed, and solid calcium heart yearn weighs 52～60g/m, and seamless welding box hat weighs 180～230g/m.Welding calcium core-spun yarn line footpath is uniform, mechanical strength is high, deeper part in molten steel can be fed, slow down or avoid splash, and enable calcium to be evenly distributed in molten steel ladle, improve the service efficiency (calcium recovery rate improve 2～5 times) of calcium line, and go to be mingled with better, the flaw detection qualification rate of steel improves to more than 99%；Utilize the method can reduce the feed quantity of welding calcium core-spun yarn, not only can reduce STEELMAKING PRODUCTION cost, moreover it is possible to save the Calcium treatment time, reduce the temperature loss during molten steel Calcium treatment, effectively control the molten steel nitrogen pick-up during steel treatment, oxygen supplement situation.
Description
Weld calcium core-spun yarn and its application process technical field in liquid steel refining
The present invention relates to liquid steel refining technical field, and in particular to a kind of welding calcium core-spun yarn and its application process in liquid steel refining.
Background technology
Wire-feeding technique is the new liquid steel refining technology grown up after the technology of dusting, exactly by deoxygenation of liquid steel, desulfurization, carburetting, be mingled with denaturation, trimming needed for material thread is made（Solid wire or filling about pulvis cored suede）, it passes through molten steel face with certain speed and reaches a kind of novel secondary refining techniques in molten steel deep by the mechanical forces for using feeding wire machine.With other Secondary Refining Technologies, particularly the technology of dusting is compared, have the advantages that yield of alloy height, accurate composition control, equipment are simple, small investment, process safety are reliable, molten steel cools less, non-environmental-pollution, since thus being developed from the mid-1970s, at home and abroad smelting iron and steel enterprise is increasingly widely applied.
Existing iron and steel enterprise's purified steel is generally powder core or pure calcium core-spun yarn with core-spun yarn.The existing general belt steel thickness of core-spun yarn is 0. 35 0. 60111111, the button side with fastening having（Referring to Fig. 1, Fig. 2), and the button edge fastened is divided into 45 times of belt steel thickness, what is had then carries and the visibly different weld seam knot of shell material（Referring to Fig. 3).The mode taken out and rotated within the common calcium iron wire on buckled side is more feeds molten steel, because it has prominent button rim portion, can bring more air into, cause the secondary pollution to molten steel；In addition, the resistance produced because being rotated into molten steel can cause the running orbit of wire body to change, and then can not reach optimum depth, so higher wire-feeding velocity and larger feed quantity are needed to use, the need for could meeting steel mill's refining.But higher wire-feeding velocity and changeable running orbit can cause molten steel splash, and cause calcium uniformly can not be scattered in ladle, calcium is received
Yield is low.The welded tube of calcium iron wire with weld seam has the weld seam different from steel band body material because of it, causes its mechanical strength to be difficult to the needs for meeting existing liquid steel refining line feeding depth.Traditional Ca-Si core-spun yarns, Ca-Al core-spun yarns and common calcium iron wire is influenceed by its shaping structures technique, is caused the Ca recovery rates after use unstable, is unfavorable for the control to liquid steel refining quality.
For the seamless relatively seamed product of calcium iron wire, production technology is more complicated, and the enterprise that can be produced both at home and abroad is less, and majority is still in development；And be difficult to produce the solid calcium iron wire compared with thickness steel casing using existing technology, and the common calcium iron wire of relatively thin box hat then needs very high wire-feeding velocity, causes its off-position in ladle to be difficult to control.Currently, smelting iron and steel enterprise is in the urgent need to improving the quality of liquid steel refining compared with the seamless calcium iron wire of thickness steel casing, and correspondingly reduces STEELMAKING PRODUCTION cost.A kind of seamless calcium line and preparation method thereof is disclosed in patent document CN 102417950B, the butt joint edge for carrying out the steel band to coating calcium core which employs the method for high-frequency welding carries out seamless welding, but the defect rate of the technical scheme is high, production efficiency is low, production cost is too high, and properties of product are also to be improved.Produce these weak points main reason is that：Circulating current (the idle current caused by can not placing impedor because wrapping up calcium core in pipe during high-frequency welding is not solved still）Greatly, the technical barrier of high energy consumption；The every high-frequency induction welding technique parameter used has much room for improvement；And the calcium iron in product is than unreasonable.
And it is well known that the selection of high-frequency induction welding technique relevant parameter, is related to the quality of welding quality, and then have influence on the bulk strength of welded tube product, credit rating and speed of production.In actual production process, influence the parameter of HFI welding quality very many, and the interaction that interacted between these parameters.The installation site of such as induction coil can influence the gap between the length at V-arrangement angle, compression roller to influence whether to weld size of amount of compression and extruding force etc..The selection stability usually to welding process of parameters, welding quality in the production process of HFI welding
Stability and the performance of welded tube can all have very big influence.
The content of the invention
The technical problem to be solved in the present invention is to provide do not ftracture, can slow down or avoid molten steel splash, calcium recovery rate height when a kind of calcium iron reasonable mixture ratio, good rigidity and line feeding, go to be mingled with the good welding calcium core-spun yarn of effect；And the application process of the welding calcium core-spun yarn in liquid steel refining is disclosed, this method can effectively reduce the usage amount of calcium line, the production cost of liquid steel refining is greatly reduced.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of welding calcium core-spun yarn of design, is the wire body as formed by seamless welding box hat parcel solid calcium cored wire, and the 10mm of wire body diameter 8, solid calcium cored wire weighs 52 60g/m, and seamless welding box hat weighs 180 230g/m;It is rapid that the preparation method Bao of the welding calcium core-spun yarn includes Yi Xia Walk：
(1) the pure calcium silk for choosing a diameter of 5 9mm is used as solid calcium cored wire；
(2) it is pipe to take the mild-carbon steel strip that thickness is 1. 0 1. 5mm to coat the calcium cored wire palintrope roll forming；
(3) with high frequency induction welding connection by the jointing edge of above-mentioned pipe under atmosphere of inert gases in closely weld together, and the joint portion after butt welding connects carries out air-cooled or contactless water cooling immediately, the frequency of alternating current used is 350 430KHz during HFI welding, 4 ° of the congregation angle 2 ° of the edge of V-arrangement zone steel two, V-arrangement section length（To the distance of meeting point in the middle part of induction coil）For 1. 3 1. 6 times of pipe caliber；The number of turn of induction coil used is 23, and its internal diameter is 1. 2 1. 5 times of pipe caliber, and its length is less than or equal to the internal diameter of itself, more than or equal to pipe external diameter；Welding temperature during HFI welding（Weld input power）, speed, extruding force（Amount of compression）Three interacts, in welding process of the present invention, and suitable selection is that 1,250 1460 °C of welding temperature during HFI welding, welding amount of compression (wraps up the pipe of calcium cored wire before and after welding extruded tube
Circumferential length difference）For 0. 33 0. 67 times of mild-carbon steel strip thickness, the 50m/min of speed of welding 30;
(4) burr at excision solder bond position, then after shaped, stretch processing welding calcium core-spun yarn.
Before cladding calcium cored wire, processing first can be passivated to the calcium cored wire outer surface of shaping：At least one layer of passivator is uniformly coated in solid calcium cored wire outer surface, and is stood after 8 15min, under 110 120 °C, dries after 0. 5 lh, that is, forms passivation film, the passivator is pressed by atoleine, soda ash: 4〜6 :12 weight is than composition.
Application process of the above-mentioned welding calcium core-spun yarn in liquid steel refining, it is rapid that Bao includes Ru Xia Walk：
(1) molten steel is after LF stoves are refined or RH stove refining treatments terminate, with feeding wire machine with 70
120m/min wire-feeding velocity feeds above-mentioned welding calcium core-spun yarn into molten steel, and feed quantity feeds 0. 4m l. 0m by molten steel per ton by the molten steel of silicon deoxidation, fed by the molten steel of aluminium deoxidation molten steel per ton
0. 8m~ l. 5m;
(2) 4 6min are reacted after the feeding of welding calcium core-spun yarn, while with 10 50m3/min flow argon bottom-blowing.
The Shang Shu Walk of are rapid（1) in, molten steel is reached after LF stoves, and lime, refining slag and slag deoxidier are added according to a conventional method and quickly makes white slag, and slugging makes the refining slag weight percent composition be after terminating：Dual alkalinity Ca0/Si02 is controlled 5：10, (TFe+MnO) % 4%, A1203% are controlled 16 29%; the Holo-Al content added in molten steel in aluminum shot or feeding aluminum steel adjustment molten steel, after LF stove processing terminates, when Holo-Al content is in 0. 015% 0. 040%; feeding welding calcium core-spun yarn, carries out Calcium treatment.
Suo Shu Walk are rapid（2) after, the molten steel after being refined through LF stoves is directly entered continuous casting working procedure, or introduces RH stove Jin traveling Yi Walk refining, the wherein 50min of RH stoves vacuum processing time 20, vacuum
The processing time that degree is 50 300Pa is 12 30min, without containing aluminium deoxidizer during application of vacuum；Then above-mentioned welding calcium core-spun yarn is fed into molten steel with 70 120m/min wire-feeding velocity with feeding wire machine for the second time, feed quantity is by the molten steel molten steel feeding 0. 8,111 1. 5111 per ton of aluminium deoxidation, variety steel molten steel feeding 1. 2 1. 6111 per ton.
The invention has the advantages that：
1. the strip that present invention welding calcium core-spun yarn is used is thick, rigid high, its line footpath is uniform, without prominent button rim portion, also in the absence of the situation of the line feeding trail change thus brought；And weld seam is formed by the mother metal fusing of steel band body, mechanical strength is better than general welded tube, it can thus feed in the deeper molten steel of ladle, effectively slow down or avoid molten steel splash, and calcium is evenly distributed in the molten steel in ladle, the service efficiency of calcium line is significantly increased, calcium yield can improve 25 times, and go to be mingled with better, the flaw detection qualification rate of steel is improved to more than 99% by 96%.
2. production practices show, the parameters selection in HFI welding technique of the present invention is reasonable, such as reduces V-arrangement angle using appropriate adjustment（To strengthen kindred effect）, increase alternating current frequency, the aggregate measures such as induction coil are reduced to increase pipe internal impedance（And then increase the welding current in V-arrangement area and substantially reduce invalid circulating current）, impedor must be laid by coaxial in pipe by changing in conventional highfrequency welding method（Bar magnet）To increase the way of internal surface of bloom induction reactance, the technical barrier of impedor can not be placed because being enclosed with calcium core in pipe to be welded by solving the present invention；For another example 30 50m/min weldering speed is used, weld zone firing rate can be made to be exceedingly fast, the enhancing of workpiece autorefrigeration, heat affected area is narrow and is not susceptible to oxidation, can obtain tissue and weld seam of good performance, will not produce the phenomenon of burning and not weld penetration；Speed of welding improves rational amount of compression in addition, is not only advantageous to shorten heat affected area, is conducive to from melting groove extrusion oxide layer, and improve production efficiency.
3. the manufacturing technique method of present invention welding calcium core-spun yarn and the reasonable selection of related process parameters so that its production efficiency is greatly improved, defect rate is substantially reduced, produce and use cost is substantially reduced, and is conducive to popularizing.
4. utilize application process of the present invention in liquid steel refining, the feed quantity of welding calcium core-spun yarn can be reduced, steel refining production cost can be not only greatly reduced, the Calcium treatment time can also be saved, the temperature loss during molten steel Calcium treatment is reduced, molten steel nitrogen pick-up, oxygenation situation effectively during control steel treatment.
5. using application process of the present invention in liquid steel refining, the mass fraction of total oxygen in steel can respectively be controlled（5〜20 ) X 106, most field trash in the steel after refining can be made to turn into spherical, the equivalent diameter of field trash is（1 10) micron, rear steel plate inspection qualification rate is rolled more than 99%, B type impurities grading overall reduction, less than 1 grade ratio accounts for 95%, Control and Inclusion Removal level is significantly improved, and greatly reduces the quality problems caused by field trash, and practical application shows, can make monthly the percent defective caused by field trash be less than 0. 5%, economic benefit is significantly improved.
Brief description of the drawings
Fig. 1 is a kind of cross-sectional configuration schematic diagram of conventional pure calcium core-spun yarn；
Fig. 2 is the cross-sectional configuration schematic diagram of another conventional pure calcium core-spun yarn；
Fig. 3 is the cross-sectional configuration schematic diagram of another conventional pure calcium core-spun yarn；
Fig. 4 welds the cross-sectional configuration schematic diagram of calcium core-spun yarn for the present invention.
In figure, 1 is calcium cored wire, and 2 be thin steel strip, and 3,6 be tightening buckle side, and 4 be solid calcium cored wire, and 5 be seamless welding box hat, and 7 be weld seam.
Embodiment
Raw material used etc., is commercially available unless otherwise instructed in following embodiments；Method therefor
Unless otherwise instructed, it is conventional method.
Embodiment 1:One kind welding calcium core-spun yarn, referring to Fig. 4, it is the wire body as formed by seamless welding box hat parcel solid calcium cored wire, and the wire body diameter 9mm, solid calcium cored wire weighs 54 ± 2g/m, seamless welding box hat weight 200g/m;It is rapid that the preparation method Bao of the welding calcium core-spun yarn includes Yi Xia Walk：(1) the pure calcium silk for choosing a diameter of 7mm is used as solid calcium cored wire；
(2) it is pipe to take the mild-carbon steel strip that thickness is 1. 0mm to coat the calcium cored wire palintrope roll forming；
(3) with high frequency induction welding connection by the jointing edge of above-mentioned pipe under atmosphere of inert gases in closely weld together, and the joint portion after butt welding connects carries out air-cooled or contactless water cooling immediately, the frequency of alternating current used is 400KHz during HFI welding, 3. 5 ° of the congregation angle of the edge of V-arrangement zone steel two, V-arrangement section length is 14mm;The number of turn of induction coil used is 3, and its internal diameter is 13mm, and induction coil length is 11mm;1350 °C of welding temperature during HFI welding, amount of compression 0. 5mm, speed of welding 40m/min;
(4) cut off welding position burr, then after shaped, stretch processing welding calcium core-spun yarn.Embodiment 2:Calcium core-spun yarn is welded in molten steel in steel making（Aluminium deoxidation steel grade）In application process, the technological process used for：Pre-processed using molten iron+refining of converter smelting+LF stoves terminates, the refining of first time feeding+RH stoves terminates, second of feeding+continuous casting.After LF stove processing terminates, about 150t molten steel, Holo-Al content welds 200 meters/stove of calcium core-spun yarn for the first time 0. 015% described in feeding embodiment 1, speed 110m/min reacts 4min, and argon flow amount is set as 15Nm3/min;RH stove refining treatments terminate rear molten steel and introduce the refining of RH stoves, second of feeding welding 200 meters/stove of calcium core-spun yarn, and speed 110m/min reacts in.
Using above-mentioned application process, total oxygen mass fraction in the steel after refining can be respectively controlled to 9 X 106, the field trash in steel is spherical, 9 microns of the maximum equivalent diameter of field trash, after rolling mostly
Steel plate inspection qualification rate 100%;B type impurities grading overall reduction, less than 1 grade ratio accounts for 98%, and Control and Inclusion Removal level is significantly improved, and greatly reduces the quality problems caused by field trash, and the of that month percent defective caused by field trash is less than 0. 08%.
Embodiment 3:Calcium core-spun yarn is welded in molten steel in steel making（Silicon killed steel kind）In application process, the technological process used for：Pre-processed using molten iron+refining of converter smelting+LF stoves terminates, the refining of first time feeding+RH stoves terminates, second of feeding+continuous casting.After LF stove processing terminates, about 80t molten steel welds 80 meters/stove of calcium core-spun yarn for the first time described in feeding embodiment 1, speed 110m/min reacts 4min, and argon flow amount is set as 15Nm7min;The refining of LF stoves terminates molten steel and introduces the refining of RH stoves, second of feeding welding 70 meters/stove of calcium core-spun yarn, and speed 110m/min reacts 4min.
Using above-mentioned application process, total oxygen mass fraction in the steel after refining can be respectively controlled to 9 X 106, and field trash in steel is spherical, 9 microns of the maximum equivalent diameter of field trash mostly, rolls rear steel plate inspection qualification rate 99%;B type impurities grading overall reduction, less than 1 grade ratio accounts for 98%, and Control and Inclusion Removal level is significantly improved, and greatly reduces the quality problems caused by field trash, and the of that month percent defective caused by field trash is less than 0. 09%.
Embodiment 4:In the application example of steel mill of South Korea
In March, 2013 is in the 320 tons of ladle applications of steel mill of South Korea, by the welding calcium core-spun yarn described in embodiment 1 with l lOm/min speed feeding three/Radius of ladle inward flange to the region at center, it is per ton to feed 1 meter, 4min is reacted, argon flow amount is set as 15Nm7min;Contrast test is done with silicon-calcium wire under identical condition simultaneously.Result of the test shows（Referring to table 1), close or identical refining effect is reached, silicon-calcium wire feeding 171g per ton is compared, 68% is reduced using the feed quantity of welding calcium core-spun yarn of the present invention, calcium recovery rate 28%, 2. 3 times are improved compared to silicon-calcium wire recovery rate 12%.
The present invention welding calcium core-spun yarn of table 1 uses result in steel mill of South Korea
Volume=2t calcium line comparison sheet 320t Ladle
Embodiment 5:The application example of certain steel mill at home
In January, 2013 150 tons of ladle applications of certain steel mill at home, by the welding calcium core-spun yarn described in embodiment 1 with l lOm/min speed feeding molten steel, position is in the region of three/Radius of ladle inward flange to center, fed by 1 meter per ton of amount, 4min is reacted, argon flow amount is set as 20Nm3/ min result of the tests are average calcium recovery rates 34. 30%, referring to table 2
Calcium bag unit length is welded to the present invention welding of table 2 calcium core-spun yarn using result by certain steel mill at home
Initial calcium contains bag calcium in core, beggar's content containing middle bag calcium and receives date steel grade cored wire feeding molten steel amount（T) core weight
Amount（%) measure（%) (%) yield（%) length (m) (kg/m)
2013/1/8 E36-T 150 151. 5 0. 0003 0. 0025 0. 055 98. 6 40. 98
2013/1/8 E36-T 150 161. 9 0. 0003 0. 0021 0. 055 98. 6 35. 82
2013/1/8 E36-T 150 158. 7 0. 0003 0. 0024 0. 055 98. 6 40. 98
2013/1/8 E36-T 150 158 0. 0003 0. 0023 0. 055 98. 6 38. 84
2013/1/9 Q345EN-3 150 161. 9 0. 0003 0. 0028 0. 055 98. 6 49. 75
2013/1/9 Q345EN-3 150 160. 8 0. 0003 0. 0036 0. 055 98. 6 65. 25
2013/1/9 Q345GJD-3 150 153. 3 0. 0003 0. 0021 0. 055 98. 6 33. 92
2013/1/9 Q370R-2 150 157. 4 0. 0003 0. 0025 0. 055 98. 6 42. 56
2013/1/9 Q370R-2 150 157. 3 0. 0003 0. 0021 0. 055 98. 6 34. 81
2013/1/9 S355-J2 150 153. 3 0. 0003 0. 0024 0. 055 98. 6 39. 58
2013/1/9 S355-J2 150 159. 5 0. 0003 0. 0022 0. 055 98. 6 37. 25
2013/1/9 S355-J2 150 149. 3 0. 0003 0. 003 0. 055 98. 6 49. 57
2013/1/9 S355-J2 150 156. 5 0. 0003 0. 0022 0. 055 98. 6 36. 56
s
r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ r→ ro ro ro
> > > > > > > > >
2013/1/29 Q235DZ15-1 180 147. 4 0. 0003 0. 0016 0. 055 98. 6 19. 63
2013/1/29 Q345R-V 180 152. 5 0. 0003 0. 002 0. 055 98. 6 26. 55
2013/1/29 Q345R-V 180 154. 6 0. 0003 0. 0021 0. 055 98. 6 28. 5
2013/1/29 Q345R-V 180 141. 5 0. 0003 0. 0021 0. 055 98. 6 26. 1
2013/1/29 Q345R-V 180 157. 6 0. 0003 0. 0021 0. 055 98. 6 29. 06
2013/1/29 Q345R-V 180 158. 3 0. 0003 0. 0023 0. 055 98. 6 32. 43
2013/1/29 Q345R-V 180 150 0. 0003 0. 0022 0. 055 98. 6 29. 2
2013/1/30 Q345R-V 180 152. 6 0. 0003 0. 0019 0. 055 98. 6 25. 01
2013/1/30 12MNNIVR-2 180 153. 6 0. 0003 0. 0022 0. 055 98. 6 29. 9
2013/1/30 12MNNIVR-2 180 154. 2 0. 0003 0. 0024 0. 055 98. 6 33. 17
2013/1/30 12MNNIVR-2 180 142 0. 0003 0. 0017 0. 055 98. 6 20. 37
2013/1/30 12MNNIVR-2 180 147. 7 0. 0003 0. 0021 0. 055 98. 6 27. 24
2013/1/30 12MNNIVR-2 180 145. 8 0. 0003 0. 0019 0. 055 98. 6 23. 9
2013/1/31 12MNNIVR-2 180 150 0. 0,003 0. 0,028 0. 055 98. 6 38. 42 changes each specific numerical parameter in above-described embodiment, or the equivalent substitution of material composition, multiple specific embodiments can be formed, it is the common excursion of the present invention, will not be described in detail herein.
Claims (5)
- Claims1. one kind welding calcium core-spun yarn, is the wire body as formed by seamless welding box hat parcel solid calcium cored wire, it is characterised in that the 10mm of wire body diameter 8, solid calcium cored wire weighs 52 60g/m, and seamless welding box hat weighs 180 230g/m;It is rapid that the preparation method Bao of the welding calcium core-spun yarn includes Yi Xia Walk：(1) the pure calcium silk for choosing a diameter of 5 9mm is used as solid calcium cored wire；(2) it is pipe to take the mild-carbon steel strip that thickness is 1.0 1.5mm to coat the calcium cored wire palintrope roll forming；(3) with high frequency induction welding connection by the jointing edge of above-mentioned pipe under atmosphere of inert gases in closely weld together, and the joint portion after butt welding connects immediately carries out air-cooled or contactless water cooling；The frequency of alternating current used is 350 430KHz during HFI welding, and 4 ° of the congregation angle 2 ° of the edge of V-arrangement zone steel two, V-arrangement section length is 1.3 1.6 times of pipe caliber；The number of turn of induction coil used is 23, and its internal diameter is 1.2 1.5 times of pipe caliber, and its length is less than or equal to the internal diameter of itself, more than or equal to pipe external diameter；1,250 1460 °C of welding temperature during HFI welding, welding amount of compression is 0.33 0.67 times of mild-carbon steel strip thickness, the 50m/min of speed of welding 30;(4) burr at excision solder bond position, then after shaped, stretch processing welding calcium core-spun yarn.2. welding calcium core-spun yarn according to claim 1, it is characterised in that in Suo Shu Walk rapid (1), processing first is passivated to solid calcium cored wire outer surface：At least one layer of passivator is uniformly coated in solid calcium cored wire outer surface, and is stood after 8 15min, under 110 120 °C, dries after 0.5 lh, that is, forms passivation film, the passivator is pressed by atoleine, soda ash：4〜6:12 weight is than composition.3. application process of the calcium core-spun yarn in liquid steel refining is welded described in claim 1, including such as Xia Walk is rapid：(1) after molten steel terminates through LF stove refining treatments, the welding calcium core-spun yarn described in claim 1 is fed into molten steel with 70 120m/min wire-feeding velocity with feeding wire machine, feed quantity feeds the 0m of 0. 4m 1. by the molten steel of silicon deoxidation by molten steel per ton, and 0. 8m ~ l. 5m are fed by the molten steel of aluminium deoxidation molten steel per ton;(2) 4 6min are reacted after feeding welding calcium core-spun yarn, while with 10 50m3/min flow argon bottom-blowing.4. application process of the welding calcium core-spun yarn according to claim 3 in liquid steel refining, it is characterised in that Suo Shu Walk are rapid（1) in, molten steel is reached after LF stoves, is added lime, refining slag and slag deoxidier and is quickly made white slag, and slugging makes the refining slag weight percent composition be after terminating：Dual alkalinity Ca0/Si02 is controlled 5：10, TFe+MnO %^4%, A1203% are controlled 16 29%; the Holo-Al content added in molten steel in aluminum shot or feeding aluminum steel adjustment molten steel, after LF stove processing terminates, when Holo-Al content is in 0. 015% 0. 040% in molten steel; start feeding welding calcium core-spun yarn, carry out Calcium treatment.5. application process of the welding calcium core-spun yarn according to claim 4 in liquid steel refining, it is characterised in that Suo Shu Walk are rapid（2) after, molten steel after being refined through LF stoves is directly entered continuous casting working procedure or introduces RH stove Jin traveling Yi Walk refinings, the 50min of RH stoves vacuum processing time 20, wherein vacuum be 50 300Pa processing time be 12 30min, without containing aluminium deoxidizer during application of vacuum；Then fed for the second time with feeding wire machine with 70 120m/min wire-feeding velocity into molten steel and weld calcium core-spun yarn described in claim 1, the 5m of 0. 8m 1. are fed by the molten steel of aluminium deoxidation molten steel per ton, variety steel molten steel per ton feeds 1. 2 1. 6m.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2014/080276 WO2015192348A1 (en) | 2014-06-19 | 2014-06-19 | Welded calcium core wire and application method thereof in molten steel refining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106170566A true CN106170566A (en) | 2016-11-30 |
| CN106170566B CN106170566B (en) | 2019-03-19 |
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| WO (1) | WO2015192348A1 (en) |
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| CN102399938A (en) * | 2011-11-29 | 2012-04-04 | 东北大学 | Inclusion control method for rod and wire alloy steel |
| CN102417950A (en) * | 2011-11-28 | 2012-04-18 | 巩义市众鑫钙业有限公司 | Seamless calcium line and preparation method thereof |
| CN102748578A (en) * | 2012-07-09 | 2012-10-24 | 巩义市众鑫钙业有限公司 | Seamless ferroaluminum wire and preparation method thereof |
| CN202643742U (en) * | 2012-06-26 | 2013-01-02 | 巩义市众鑫钙业有限公司 | Seamless calcium iron wire |
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- 2014-06-19 WO PCT/CN2014/080276 patent/WO2015192348A1/en active Application Filing
- 2014-06-19 CN CN201480076534.0A patent/CN106170566B/en not_active Expired - Fee Related
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| WO2015192348A1 (en) | 2015-12-23 |
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