CN102950392B - Wire rod for submerged arc welding wire of production pipeline and manufacturing method thereof - Google Patents
Wire rod for submerged arc welding wire of production pipeline and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a wire rod for submerged arc welding wires of a production pipeline and a manufacturing method thereof, wherein the wire rod comprises the following chemical components in percentage by weight: 0.04 to 0.11 percent of C, 0.10 to 0.40 percent of Si, 1.40 to 1.90 percent of Mn1, 0.40 to 0.60 percent of Ni0.20 to 0.40 percent of Mo0.20, 0.03 to 0.10 percent of Ti0, 0.004 to 0.007 percent of B, 0.010 to 0.030 percent of Al, less than or equal to 0.003 percent of S, less than or equal to 0.008 percent of P, less than or equal to 0.0015 percent of O, less than or equal to 0.0040 percent of N, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: converter smelting adopts a duplex method, LF refining adopts slag system components according to the weight percentage: CaO42.0-58.0%, Al2O3 15.2％～27.5％，SiO23.5 to 6.0 percent, weak blowing is adopted in VD refining, whole-process protection pouring is adopted in continuous casting, electromagnetic stirring is carried out at the tail end of a crystallizer, the wire rolling and spinning temperature is 830 to 850 ℃, the speed of an air cooling roller way is 4 to 6m/min, and the wire rod with the tensile strength less than or equal to 700Mpa is obtained. When the wire rod is drawn into a finished welding wire with phi 4mm or phi 3.2mm, the annealing process is omitted. The invention improves the obdurability of the weld metal and solves the problems of low steel cleanliness and high wire rod strength.
Description
Technical field
The present invention relates to a kind of production welding wire wire rod, especially a kind of wire rod of X80 level pipeline welding wire for submerged-arc welding and manufacture method thereof.
Background technology
Pipe line steel is also not quite similar due to its supporting welding wire of difference of rank and composition.The X80 level submerged arc welding wire for steel pipeline of import, general containing precious metals such as higher Ni, Mo, expensive, and some kinds of domestic-developed, when alloy system designs, whole and Some substitute are carried out to Ni, Mo in order to reduce costs, adopt simultaneously and add tissue that the micro alloying element such as Ti, B, Zr carrys out refinement and improve weld seam to improve obdurability, but these micro alloying elements are oxidizable when smelting, Composition Control difficulty is large, secondly the oxide inclusions properties of weld formed when welding affect fashion time bad, poor stability.Relevant patent comprises that application number is 200810005040.X, application number is 200610124514.3, application number be 200610145593.6 and application number be the Chinese patent of 200510029245.8.Above-mentioned smelting process mainly adopts electric furnace or converter, and what have is below furnished with LF refining furnace, and the cleanliness of molten steel is not high, and the obdurability of some impurity elements especially S, P, O butt welded seam has a negative impact.Mainly adopt the rolling of high speed twist-free mill when producing wire rod, the wire rod of some welding wires, before drawing or in drawing process, carries out annealing heat treatment, and this is as good as and adds labour intensity and cost, if application number is the Chinese patent of 200510029245.8.Along with the day different raising that continuous upgrading and the pipe engineering Welded Pipe Weld Performance of pipeline steel quality require, especially under the market competition of fierceness, high-strength, the high-ductility that Welded Pipe expection reaches, the overall characteristic requirement such as anti-corrosion, wear-resisting, just there is above-mentioned deficiency in the composition of existing welding wire or manufacture method.
1. the Chinese patent of application number 200810005040.X, provide a kind of high-strength high-ductility high-soldering-speed welding wire for submerged arc welding for high, be made up of following compositions and be by weight percentage: C0.03%-0.09%, Si0.1%-0.3%, Mn1.70%-2.3%, P < 0.010%, S < 0.008%, Mo0.2%-0.7%, Ti0.04%-0.10%, B0.003%-0.009%, Zr0.001%-0.003%, surplus is Fe and inevitable impurity.Reach the needs of the height weldering speed needed for welding X80 steel-grade weld seam, high strength, high tenacity.Smelting process adopts desulfurizing iron; control into stove molten steel sulfur content; select the raw material that S, P content is low; adopt pneumatic steelmaking and top bottom blowing technique, C, S, P of smelting endpoint are controlled at reduced levels, after deoxidation alloying; adopt the furnace outer refining process such as LF stove; add the trace elements such as Mn, Si, Mo, Ti, B, Zr, molten steel pours into continuous casting billet through casting machine full guard, and continuous casting billet is rolled into the wire rod of Ф 5.5mm through high speed twist-free mill.
2. the Chinese patent of application number 200610124514.3, provides a kind of high ductility buried arc welding wire for low-alloy super-strength steel, its chemical composition by weight percentage: C0.06%-0.12%; Si0.03%-0.20%; Mn1.50%-2.00%; Cr0.20%-0.60%; Ni1.40%-2.60%; Cu0.10%-0.60%; Ti0.06%-0.20%; Mo0.10%-0.50%; B0.002%-0.010%; Surplus is Fe and inevitable impurity.The tensile strength of weld metal reaches 800MPa ,-40 DEG C of Impact energy Ak v >=47J, welding wire steel electric furnace smelting.
3. the Chinese patent of application number 200610145593.6, provides a kind of submerged arc welding wire for steel pipeline, its chemical composition by weight percentage: C0.02%-0.07%; Si0.10%-0.30%; Mn1.80%-2.50%; P < 0.010%; S < 0.010%; Cr0.10%-0.50%; Ti0.05%-0.08%; Mo0.20%-0.50%; B0.003%-0.004%; Surplus is Fe and inevitable impurity.Tensile strength>=the 700MPa of weld metal ,-20 DEG C of Impact energy Ak v>=150J, are suitable for the submerged arc welding of the senior Pipeline Steel Plate of X80, and welding wire smelting process adopts (desulfurizing iron)-converter smelting-LF stove refining-160mm
2billet caster molding casting.The rolling of high speed twist-free mill is adopted when producing wire rod.
4. the Chinese patent of application number 200510029245.8, provide a kind of high-performance buried arc welding wire and wire rod and manufacture method thereof, its chemical composition contains: C0.06%-0.13%; Si0.1%-0.5%; Mn1.3%-1.7%; Mo0.3%-0.6%; Ti0.010%-0.015%; B0.001%-0.009%; Surplus is Fe and inevitable impurity.Can be used for the submerged-arc welding of tensile strength rank at 580-680MPa high strength steel.The manufacture method of wire rod comprises the steps: that the welding wire wire rod of mentioned component is before drawing or in drawing process, and annealing heat treatment process is: heat in 680 ~ 800 DEG C of heating furnaces, and insulation 2 ~ 10h cools with stove.
Summary of the invention
The object of this invention is to provide a kind of wire rod and manufacture method thereof of production flow line welding wire for submerged-arc welding, by dosing a certain amount of Al and Ti, B synergy, improving the obdurability of weld metal.Clean steel production method cold rolling technique of easing up is adopted to solve the problems such as the low and wire rod intensity of steel cleanliness factor is high.
One, the present invention relates to wire rod composition by weight percentage: C0.04% ~ 0.11%, Si0.10% ~ 0.40%, Mn1.40% ~ 1.90%, Ni0.40% ~ 0.60%, Mo0.20% ~ 0.40%, Ti0.03% ~ 0.10%, B0.004% ~ 0.007%, Al0.010% ~ 0.030%, S≤0.003%, P≤0.008%, O≤0.0015%, N≤0.0040%, surplus is Fe and inevitable impurity.
The present invention first usually improves weld metal obdurability by increasing the unit such as Mn, Ti, B from Composition Design, suitably adds Ni, Mo element, practices every conceivable frugality and use these noble elements to reduce costs under the prerequisite ensureing toughness; Second improves the weldability of mild steel significantly by the synergy of adding the micro alloying element such as appropriate Al and Ti, B, the mainly formation such as carbide, nitride, oxide in process of setting, the particulate of these compounds is as crystallization nucleus thus the as-cast structure of refinement weld metal and crystal grain, improve the intensity of steel, toughness, wearability, resist timeliness effect simultaneously, and useful effect is also played to resistant to hydrogen; Objectionable impurities element O, the N content such as P, S in the 3rd pair of steel and gas claim, and improve steel cleanliness factor, reach the requirement of alternative import steel level, improve the application performance of steel grade further.
The explanation of each element of wire rod composition of production flow line welding wire for submerged-arc welding of the present invention:
(1) C:C is most important alloying element in microalloy weld metal, is the element expanding γ phase region.The result of study of G.M.Evans thinks that C can impel formation acicular ferrite, reduce crystal boundary polygonal ferrite, and refinement reheating district crystal grain, improve the intensity of deposited metal, but hardness increase simultaneously, Charpy impact can decline along with the increase of C carbon content, and the phosphorus content of best impact property is 0.05% ~ 0.10%.Consider, in wire rod composition, carbon content should be 0.04% ~ 0.011%.
(2) Mn:Mn is as the main alloy element in Weld Metal in Microalloyed Steel, and significantly affect austenite diffusion, Mn is austenite stable element, makes austenite phase transformation shift to lower temperature.Mn mono-aspect can be used as deoxidier, has on the other hand crystal grain thinning and the strong effect of solid solution.G.M.Evans thinks that the increase of Mn content 0.6% ~ 1.8% can increase the content of acicular ferrite, decreases the content of pro-eutectoid ferrite, and the as-welded acicular ferrite structure of refinement, the also tissue of refinement weld heat-affected zone coarse grain zone.The increase of Mn content, decreases the thin brilliant crystallite dimension of the axles such as welding heat affected zone.Mn content often increases by 0.1%, and as-welded weld metal yield strength and hot strength approximately increase 10MPa.The increase of Mn content adds yield strength on the one hand, add on the other hand the volume fraction of acicular ferrite and the refinement crystallite dimension of hot-zone again, the impact of these two kinds of factors makes Mn content in certain scope, the compound segregation of excessive easy generation Mn and P reduces toughness, and resists H
2s corrosion is unfavorable.Consider, in wire rod composition, Mn content should be 1.40% ~ 1.90%.
(3) generally can reduce welding seam toughness adding of Si:Si, but G.M.Evans thinks, Si can impel the formation of acicular ferrite.Consider, in wire rod composition, Si content should be 0.10% ~ 0.40%.
(4) Ni:Ni is the beneficial element improving weld seam low-temperature impact toughness, is infinitely solid-solution in γ-Fe, is the element expanding γ phase region, CCT curve also can be made to move to right, thus can impel the formation of acicular ferrite, welding seam toughness is improved.But Ni content increases cost and just improves, and consider, in wire rod composition, Ni content should be 0.40% ~ 0.60% thereupon.
(5) Mo:Mo is the element reducing γ phase region, is middle carbide, and its Main Function is the transformation of postponement pro-eutectoid ferrite and is conducive to being formed bainite structure, and strong inhibition perlitic transformation.Research shows, when Mo content changes between 0 ~ 1.1%, seam organization is mainly pro-eutectoid ferrite, ferrite side plate and acicular ferrite, increases toughness, intensity and hardness simultaneously, but also promote the formation of M-A constituent element and bainite, yield tensile ratio and percentage elongation decline simultaneously.Mo content is generally no more than 0.50%.Consider, in wire rod composition, Mo content is 0.20% ~ 0.40%.
(6) B, Ti: add B, Ti and improve obdurability, have research to think, under the protection of Ti, effective B segregation in austenite boundaries, crystal boundary is separated out a large amount of carbide Fe containing B
23(BC)
6, it generates prior to ferrite, and pro-eutectoid ferrite can be hindered to be formed, thus promotes the formation of intragranular acicular ferrite, improves obdurability.In weld seam, the field trash of Ti becomes the forming core particle of acicular ferrite simultaneously, promotes the formation of acicular ferrite thus the obdurability of raising weld seam.Consider, Ti content 0.03% ~ 0.10%, B content 0.004% ~ 0.007% in wire rod composition.
(7) Al: nitrogen agent is determined in the deoxidation be mainly used in when making steel, and crystal grain thinning, suitable aluminium can improve steel toughness at low temperatures.Consider, Al content 0.010% ~ 0.030% in wire rod composition.
(8) S, P:S are easy to the hot tearing causing weld seam, and significantly reduce impact flexibility.Simultaneously in welding process, sulphur is easy to oxidation, generates sulfur dioxide gas and overflows, so that in weld metal, produces a lot of pore and loosen, and P increases the sensitiveness of welding and splitting, and considers, S content≤0.003% in wire rod composition, P content≤0.008%.
(9) O, N: reduce O, the N content in steel, can improve the degree of purity of steel, ensures the beneficial effect of alloying, micro alloying element in composition, reduces the generation of friable tissues, improve the obdurability of weld metal further.Consider, O content≤0.0015% in wire rod composition, N content≤0.0040%.
Two, the manufacture method of the wire rod of production flow line welding wire for submerged-arc welding of the present invention comprises desulfurizing iron-converter smelting-LF stove refining-VD refining-continuous casting-wire rod rolling and becomes wire rod, be characterized in that described converter smelting adopts duplex practice, the tapping temperature of first half molten steel is at 1420 ~ 1440 DEG C, the tapping temperature of later half molten steel is at 1680 ~ 1700 DEG C, P≤0.008% in steel can be made, improve the cleanliness factor of steel; The slag system ingredient that described LF refining adopts is by weight percentage: CaO42.0% ~ 58.0%, Al
2o
315.2% ~ 27.5%, SiO
23.5% ~ 6.0%, S≤0.003% in steel can be made, improve the cleanliness factor of steel; Described VD refining, vacuum is 67 ~ 100Pa, pressurize 5 ~ 15min, and after broken empty, soft argon blowing 5 ~ 10min reaches and degass, goes the object that is mingled with, improves the cleanliness factor of steel; Described continuous casting adopts molding casting, in ladle long nozzle and crystallizer submersed nozzle argon shield, and crystallizer end electromagnetic agitation, current strength 350 ~ 500A, casting speed 0.7 ~ 0.8m/min; Retarded cooling process measure is adopted when wire rod rolling, namely when described wire rod rolling, laying temperature controls at 830 ~ 850 DEG C, and air-cooled roller table speed is 4 ~ 6m/min, and adopts the measure of button cover and closedown blower fan, to reduce cooling rate, obtain Ф 5 ~ 6mm wire rod of tensile strength≤700Mpa.This wire rod, when being drawn into the finished product welding wire of Ф 4mm or Ф 3.2mm, saves annealing operation.
Technical scheme of the present invention mainly comprises composition, process for making and wire rod retarded cooling process scheme.
Technical characteristic: 1. from Composition Design, apply new strengthened mechanism, dose a certain amount of Al (0.01% ~ 0.03%) and Ti, B acts synergistically, namely grain refinement mechanism and microalloying theory reach the object gaining in strength and improve toughness, again save precious metal Ni, the consumption of Mo, reduce costs, and contrast patent and all do not relate to Al, give full play to B to the superiority improving steel mechanical property, relative contrast's patent improves the lower limit (0.004%) of B, strict control B higher limit (0.007%) simultaneously, during because of B content height, when solidification of molten steel, boride due to segregation precipitation can weaken the intensity of crystal boundary, in continuous casting production process, easily produce bleed-out cause security incident, accurately Ni (0.40% ~ 0.60%), Mo (0.20% ~ 0.40%) content range, the controllability realizing composition is that the stable of properties of product provides guarantee, specific requirement has been done on the upper limit affecting the extremely important harmful element P (≤0.008%) of steel low-temperature flexibility, with contrast patent, reduce the upper limit, improve low-temperature flexibility, the impurity element that other S and gas O, N are harmful to Steel Properties is claimed simultaneously, realize obdurability further 2. in manufacture method, steel-making aspect, converter adopts advanced duplex practice, and effectively de-P realizes the requirement of P≤0.008%, and contrast patent is without this method, LF stove adopts slag system to be CaO42.0% ~ 58.0% by weight percentage, Al
2o
315.2% ~ 27.5%, SiO
23.5% ~ 6.0%, realize the requirement of O≤0.0015%, S≤0.003%, contrast patent is without this method, and VD adopts high vacuum degassing and the weak technology for clarifying that blows to realize N≤0.0040%, continuous casting adopt crystallizer electromagnetism to stir and secondary cooling water cold by force, low pulling rate, can ensure the quality of strand, ensures that continuous casting direct motion prevents bleed-out, and contrast patent is without this method.3. in the wire rod rolling technique of manufacture method, have employed retarded cooling process newly developed, reduce the processing intensity of wire rod, wire rod need not be annealed before drawing or in drawing process, reach the object realizing energy-saving and environmental protection, cost declining.
The advantage that the present invention has and effect:
1, stablize with the Quality of Final Welding Wire that this wire rod is produced, coupling alkalescent sintered flux SJ101, the deposited metal intensity obtained reaches >=682MPa, ballistic work AKV (-20 DEG C) >=130J, strength of welded joint reaches >=700MPa, ballistic work AKV (-20 DEG C) >=136J, the welding of suitable X80 level Pipeline Steel Plate.
Decrease the addition of precious alloy in the Composition Design of 2, wire rod and welding wire, Costco Wholesale is low.
3, wire rod is easy to drawing processing, and the tensile strength≤700Mpa of wire rod produces welding wire with this wire rod, need not anneal, reduce the production cost of user before drawing or in drawing process.
4, with the finished product welding wire moderate strength that this wire rod is produced, be easy to be wound around wire feed.
Detailed description of the invention
The present invention is further described by the following embodiment.
Embodiment 1: first send converter smelting by the molten steel after desulfurization, adopt duplex practice, the tapping temperature of first half molten steel is 1422 DEG C, and the tapping temperature of later half molten steel is 1682 DEG C, P0.006% in molten steel, and tapping process carries out deoxidation alloying.Slag system ingredient in LF stove refining process: CaO50.0%, Al
2o
320.0%, SiO
25.0%, the S in molten steel is 0.002%, and alloying element is adjusted to steel grades requirement; In VD refining, vacuum is 67Pa, pressurize 10min, broken empty rear soft argon blowing 5min; Deliver to 280 × 380mm again
2the continuous casting board of rectangular bloom is poured into a mould, in ladle long nozzle and crystallizer submersed nozzle argon shield, crystallizer end electromagnetic agitation, current strength 400A, casting speed 0.75m/min; After roll into 120 × 120mm through tandem rolling
2specification square billet, to wire rod rolling, adopts high speed twist-free mill Rolling Production to go out Ф 5.5mm wire rod.Wherein during wire rod rolling, laying temperature controls at 830 DEG C, and air-cooled roller table speed is 5m/min, adopts the measure of button cover and closedown blower fan.The chemical composition of the wire rod produced by above-mentioned condition is by weight percentage: C0.06%, Si 0.20%, Mn1.75%, Ni0.50%, Mo0.30%, Ti0.05%, B0.005%, Al 0.02%, S0.001%, P0.007%, O0.0010%, N0.0030%, surplus is Fe and inevitable impurity, and the tensile strength of Ф 5.5mm wire rod is 650Mpa.
The welding wire produced with this wire rod and SJ101-G solder flux mate and carry out deposited metal and weld, and test plate (panel) is X80 pipeline, and thickness is 24mm, bevel angle 30 °, and root gap is 12mm.Welding conditions are: welding current 475 ~ 575A, and weldingvoltage is 27 ~ 30V, speed of welding 23.5 ~ 26.5m/h, weld heat input 23KJ/cm, interlayer temperature≤150 DEG C.The mechanical property of the deposited metal of the welding wire produced with the present embodiment is in table 1.
The welding wire produced with this wire rod and SJ101-G solder flux mate and carry out X80 level pipe line steel and weld, and motherboard is Anshan iron and steel plant X80 level Pipeline Steel Plate, its chemical composition: C0.05%, Si0.2%, Mn1.84%, P0.009%, S0.002%, Ni0.2%, Al0.033%.Thickness is 18.4mm, and bevel angle is the double V-groove of 60 °.Welding conditions are: welding current 475 ~ 575A, and weldingvoltage is 27 ~ 30V, speed of welding 23.5 ~ 26.5m/h, weld heat input 23KJ/cm, interlayer temperature≤150 DEG C.The performance of the weld metal of the welding wire produced with the present embodiment is in table 2.
Embodiment 2: first send converter smelting by the molten steel after desulfurization, adopt duplex practice dephosphorization, the tapping temperature of first half molten steel is 1425 DEG C, and the tapping temperature of later half molten steel is at 1690 DEG C, and P0.006% in steel, carbon is 0.07%, and tapping process carries out deoxidation alloying.Slag system ingredient in LF stove refining process: CaO45%, Al
2o
323.0%, SiO
25.0%, the S in molten steel is 0.002%, and alloying element is adjusted to steel grades requirement; In VD refining, vacuum is 67Pa, pressurize 10min, broken empty rear soft argon blowing 5min; Deliver to 280 × 380mm again
2the continuous casting board of rectangular bloom is poured into a mould, in ladle long nozzle and crystallizer submersed nozzle argon shield, crystallizer end electromagnetic agitation, current strength 400A; Casting speed 0.7m/min; After roll into 120 × 120mm through tandem rolling
2specification square billet, to wire rod rolling, adopts high speed twist-free mill Rolling Production to go out Ф 5.5mm wire rod.Wherein during wire rod rolling, laying temperature controls at 830 DEG C, air-cooled roller table speed 5m/min, adopts the measure of button cover and closedown blower fan.The chemical composition of the wire rod produced by above-mentioned condition is by weight percentage: C0.07%, Si 0.20%, Mn1.77%, Ni0.45%, Mo0.30%, Ti0.05%, B0.006%, Al0.01%, S0.001%, P0.006%, O0.0012%, N0.0025%, surplus is Fe and inevitable impurity, and the tensile strength of Ф 5.5mm wire rod is the wire rod of 680Mpa.
Welding procedure and motherboard material identical with embodiment 1, the mechanical property of deposited metal of the welding wire produced with the present embodiment wire rod is in table 1, and the performance of weld metal is in table 2.
Embodiment 3: first send converter smelting by the molten steel after desulfurization, adopt duplex practice dephosphorization, the tapping temperature of first half molten steel is at 1430 DEG C, and the tapping temperature of later half molten steel is at 1700 DEG C, and P0.005% in steel, carbon is 0.07%, and tapping process carries out deoxidation alloying.Slag system ingredient in LF stove refining process: CaO.55%, Al
2o
324.0%, SiO
26.0%, the S in molten steel is 0.001%, and alloying element is adjusted to steel grades requirement; In VD refining, vacuum is 67Pa, pressurize 10min, broken empty rear soft argon blowing 5min; Deliver to 280 × 380mm again
2the continuous casting board of rectangular bloom is poured into a mould, in ladle long nozzle and crystallizer submersed nozzle argon shield, crystallizer end electromagnetic agitation, current strength 400A; Casting speed 0.8m/min; After roll into 120 × 120mm through tandem rolling
2specification square billet to wire rod rolling, adopt high speed twist-free mill Rolling Production to go out Ф 5.5mm wire rod, afterwards wire rod peeled off, pickling, copper facing, make (drawing) Ф 4mm welding wire.Wherein during wire rod rolling, laying temperature controls at 830 DEG C, and air-cooled roller table speed is 5m/min, adopts the measure of button cover and closedown blower fan.The chemical composition of the wire rod produced by above-mentioned condition is by weight percentage: C0.07%, Si 0.18%, Mn1.80%, Ni0.46%, Mo0.35%, Ti0.04%, B0.005%, Al0.03%, S0.001%, P0.006%, O0.0011%, N0.0028%, surplus is Fe and inevitable impurity, and the tensile strength of Ф 5.5mm wire rod is the wire rod of 690Mpa.
Welding procedure and motherboard material identical with embodiment 1, the mechanical property of welding wire deposited metal that the present embodiment wire rod is produced is in table 1, and the performance of weld metal is in table 2.
The performance of the deposited metal of the welding wire that table 1 embodiment of the present invention wire rod is produced
The performance of the welding point of the welding wire that table 2 embodiment of the present invention wire rod is produced
Claims (2)
1. a wire rod for production flow line welding wire for submerged-arc welding, is characterized in that wire rod chemical composition is by weight percentage: C0.04% ~ 0.11%, Si0.18% ~ 0.40%, Mn1.40% ~ 1.90%, Ni0.40% ~ 0.60%, Mo0.20% ~ 0.40%, Ti0.03% ~ 0.10%, B0.005% ~ 0.007%, Al0.010% ~ 0.030%, S≤0.003%, P≤0.008%, O≤0.0015%, N≤0.0040%, surplus is Fe and inevitable impurity.
2., for a wire rod manufacture method for pipeline welding wire for submerged-arc welding according to claim 1, comprise desulfurizing iron-converter smelting-LF stove refining-VD refining-continuous casting-wire rod rolling; Described converter smelting adopts duplex practice, and the tapping temperature of first half molten steel is at 1420 ~ 1440 DEG C, and the tapping temperature of later half molten steel is at 1680 ~ 1700 DEG C; The slag system ingredient that the refining of described LF stove adopts is by weight percentage: CaO42.0% ~ 58.0%, Al2O315.2% ~ 27.5%, SiO23.5% ~ 6.0%; Described VD refining, vacuum is 67 ~ 100Pa, pressurize 5 ~ 15min, broken empty rear soft argon blowing 5 ~ 10min; Described continuous casting adopts molding casting, in ladle long nozzle and crystallizer submersed nozzle argon shield, and crystallizer end electromagnetic agitation, current strength 350 ~ 500A, casting speed 0.7 ~ 0.8m/min; During described wire rod rolling, laying temperature controls at 830 ~ 850 DEG C, and air-cooled roller table speed is 4 ~ 6m/min.
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| CN108393614B (en) * | 2017-02-08 | 2020-09-01 | 鞍钢股份有限公司 | High-quality welding wire steel wire rod and production method thereof |
| CN108062992B (en) * | 2017-11-07 | 2020-06-30 | 邢台钢铁有限责任公司 | Steel wire for copper-clad steel composite shielded wire and production method thereof |
| CN110666391B (en) * | 2019-09-29 | 2021-08-20 | 宜昌猴王焊丝有限公司 | Submerged arc welding wire for pipeline steel |
| CN110814580A (en) * | 2019-10-29 | 2020-02-21 | 哈焊所华通（常州）焊业股份有限公司 | Machining method for stable welding wire for pipeline mold |
| CN113245742A (en) * | 2021-04-12 | 2021-08-13 | 包头钢铁（集团）有限责任公司 | Novel low-cost welding wire for submerged-arc welding of X80 pipeline steel and preparation method thereof |
| CN114378480B (en) * | 2022-02-08 | 2023-07-07 | 张家港荣盛特钢有限公司 | Large heat input submerged-arc welding wire steel wire rod, preparation method thereof, large heat input submerged-arc welding wire and large heat input welding method |
| CN115351458B (en) * | 2022-10-19 | 2023-02-14 | 张家港荣盛特钢有限公司 | Steel for submerged arc welding wire, wire rod, submerged arc welding wire and preparation method thereof |
| CN115647653B (en) * | 2022-12-13 | 2023-04-07 | 山东聚力焊接材料有限公司 | High-strength wire rod for pipeline steel welding and preparation method |
| CN116586823B (en) * | 2023-07-17 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Welding wire molten steel and welding wire for welding medium-pressure hydrogen transmission pipeline and preparation method thereof |
| CN116586822B (en) * | 2023-07-17 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Solid welding wire for medium-pressure hydrogen-doped gas conveying pipeline and preparation method thereof |
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