CN102267021B - Submerged arc welding wire for pipeline steel and manufacturing method thereof - Google Patents
Submerged arc welding wire for pipeline steel and manufacturing method thereof Download PDFInfo
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- 241001062472 Stokellia anisodon Species 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Arc Welding In General (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention provides a submerged arc welding wire for pipeline steel and a manufacturing method thereof, wherein the welding wire comprises the following components: c: 0.04 to 0.07 percent of Si: 0.10-0.40%, Mn: 1.40% -1.90%, Ni: 0.40% -1.50%, Mo: 0.20-0.50%, Cu: 0.10% -0.30%, V: 0.03 to 0.20 percent of AlS：0.02 to 0.07 percent of the total weight of the alloy, less than or equal to 0.003 percent of S, less than or equal to 0.010 percent of P, and the balance of Fe and inevitable impurities. The manufacturing method comprises the steps of molten iron desulphurization, converter smelting, LF furnace refiningContinuous casting, wire rolling, wire rod shelling, acid pickling, borax coating and copper plating, wherein slag system components adopted for LF refining comprise CaO40.0-60.0 percent and Al2O315.0％～27.0％，SiO24.0% -6.0%; the continuous casting adopts protective pouring; and a slow cooling process measure is adopted during the wire rod rolling. The welding wire has stable quality and is suitable for welding X80 grade pipeline steel plates. The welding wire has simple manufacturing method, few working procedures, low cost and easy industrialized production.
Description
Technical field
The invention belongs to field of welding material, relate in particular to the welding wire for submerged-arc welding that the submerged arc welding of a kind of X80 of being applicable to level Pipeline Steel Plate is used.
Background technology
Pipe line steel is because its supporting welding wire of difference of rank and composition is also not quite similar.X80 level submerged arc welding wire for steel pipeline at present, its Composition Design mainly adopt micro alloying elements such as adding Ti, B, Zr to carry out refinement and the tissue that improves weld seam to improve obdurability, but these micro alloying elements are in the time smelting, oxidizable, Composition Control difficulty is large, secondly the oxide inclusions properties of weld forming in the time of welding affect fashion time bad, poor stability.Relevant patent comprises that application number is that 200810005040.X, application number are 200610124514.3, application number is 200610145593.6 and the application number Chinese patent that is 200510029245.8.Its smelting process mainly adopts electric furnace or converter, and what have is furnished with LF refining furnace below, requires degree lower to the control of impurity element especially S, P, O.These are all unfavorable for the performance of weld seam, and Patents has that application number is that 200810005040.X, application number are 200610124514.3, application number is 200610145593.6 and the application number Chinese patent that is 200510029245.8.It is produced and mainly adopts the rolling of high speed twist-free mill when wire rod, and some wire rod of welding wires are before drawing or in drawing process, the heat treatment of annealing, and this is as good as has increased labour intensity and cost, as the application number Chinese patent that is 200510029245.8.Along with the continuous upgrading of pipeline steel quality and the day different raising of pipe engineering Welded Pipe Weld Performance requirement, especially that Welded Pipe expection reaches is high-strength, high-ductility, the overall characteristic requirement such as anti-corrosion, wear-resisting, and the composition of existing welding wire and manufacture method cannot meet described requirement.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned existing welding wire, provide one to be specially adapted to X80 level pipe line steel, good combination property, become low, be easy to the welding wire for submerged-arc welding of suitability for industrialized production.
The composition of submerged arc welding wire for steel pipeline of the present invention is: by weight percentage, C:0.04%～0.07%, Si:0.10%～0.40%, Mn:1.40%～1.90%, Ni:0.40%～1.50%, Mo:0.20%～0.50%, Cu:0.10%～0.30%, V:0.03%～0.20%, Al
s: 0.02%～0.07%.S≤0.003%, P≤0.010%, surplus is Fe and inevitable impurity.
The present invention is from Composition Design, first, not oxidizable when improving significantly the weldability of mild steel and smelt by adding appropriate V element, it is convenient to control, the helpfulness of its welding is mainly the formation such as the carbide that has in process of setting, nitride, oxide, thereby the particulate of these compounds is as as-cast structure and the crystal grain of crystallization nucleus refinement weld metal, improves the intensity, toughness, wearability of steel, resist timeliness effect simultaneously, and resist hydrogen and also play useful effect; The second, keep mating with mother metal with moderate C, Mn content, admittedly melt strengthening by adding Ni, Mo, add Cu and improve corrosion resistance, improve the mobility of molten steel, to being welded with profit; The 3rd, high to the harmful element such as P, the S content control degree in steel, make S≤0.003% in steel by smelting means, P≤0.010%, reaches steel cleaning.
The explanation of the each element of submerged arc welding wire for steel pipeline composition of the present invention:
(1) C:C is most important alloying element in microalloy weld metal, is the element that expands 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 is hot-zone crystal grain again, 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 component of weld wire, carbon content should be 0.04%～0.07%.
(2) Mn:Mn, as the main alloy element in Weld Metal in Microalloyed Steel, significantly affects austenite diffusion, and Mn is austenite stable element, makes austenite phase transformation shift to lower temperature.Mn can be used as deoxidier on the one hand, the effect G.M.Evans that has on the other hand crystal grain thinning and solid solution and be by force thinks that the increase of Mn content (0.6%～1.8%) can increase the content of acicular ferrite, reduce the content of pro-eutectoid ferrite, and the as-welded acicular ferrite structure of refinement, the also increase of organizing Mn content of refinement weld heat-affected zone coarse grain zone, has reduced the thin brilliant crystallite dimension of the axles such as welding heat affected zone.The every increase by 0.1% of Mn content, as-welded weld metal yield strength and hot strength approximately increase 10MPa.The increase of Mn content has increased yield strength on the one hand, the crystallite dimension of hot-zone again that increased on the other hand the volume fraction of acicular ferrite and refinement, the impact of these two kinds of factors makes Mn content in certain scope, excessive easy generation Mn and the compound segregation of P reduce toughness, and antagonism H
2s corrosion is unfavorable.Consider, in component of weld wire, 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 component of weld wire, Si content should be 0.10%～0.40%.
(4) Ni:Ni is the beneficial element that improves weld seam low-temperature impact toughness, and unlimited solid solution, in γ-Fe, is the element that expands γ phase region, also can make CCT curve move to right, thereby can impel the formation of acicular ferrite, and welding seam toughness is improved.But Ni content increases cost and just improves thereupon, considers, and in component of weld wire, Ni content should be 0.40%～1.50%.
(5) Mo:Mo is the element that dwindles γ phase region, is middle carbide, and its Main Function is to postpone the transformation of pro-eutectoid ferrite and be conducive to form bainite structure, and strong inhibition perlitic transformation.Research shows, when Mo 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 promoted the formation of M-A constituent element and bainite, yield tensile ratio and percentage elongation decline simultaneously.Mo content generally should not exceed 0.50%.Consider, in component of weld wire, Mo content is 0.20%～0.50%.
(6) Cu:Cu reduces γ → a transition temperature, and Cu has the ability of Chinese People's Anti-Japanese Military and Political College's gas and corrosion.Energy refinement original austenite grain size, increases hardness and hot strength, and increases the volume fraction of second-phase.Add Cu can obtain intensity, hardness and corrosion stability and do not damage toughness.When Cu can improve pipe line steel at saturated H 0.20%～0.30% time
2anti-hydrogen attack performance in S artificial sea water.Consider, in component of weld wire, Cu content is 0.10%～0.30%.
(7) V:V can improve the weldability of mild steel significantly, the formation such as the carbide that has in this main process of setting, nitride, oxide, thereby the particulate of these compounds is as as-cast structure and the crystal grain of crystallization nucleus refinement weld metal, reduce the superheated susceptivity of heat affected area, improve the intensity, toughness, wearability of steel, resist timeliness effect simultaneously, and resist hydrogen and also play useful effect.But vanadium amount is unsuitable too high, not so, due to V
4c
3, consider causing the reduction of steel toughness at the disperse educt of intracrystalline, in component of weld wire, V content is 0.03%～0.20%.
(8) Al: nitrogen agent is determined in the deoxidation while being mainly used in making steel, and crystal grain thinning, suitable aluminium can improve steel toughness at low temperatures.Consider Al in component of weld wire
s0.02%～0.07%.
(9) S, P:S are easy to cause the hot tearing of 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, produce the sensitiveness that a lot of pores and loose P increase weldering are split, the cleanliness factor of O, N content influence steel, considers, S≤0.003% in component of weld wire, P≤0.010%.
The manufacture method of submerged arc welding wire for steel pipeline of the present invention comprises peel off-pickling-painting of desulfurizing iron-converter smelting-LF stove refining-continuous casting-wire rod rolling-wire rod borax-copper facing, make finished product welding wire, be characterized in that the slag system ingredient that described LF refining adopts is: CaO40.0%～60.0%, Al
2o
315.0%～27.0%, SiO
24.0%～6.0%, can make S≤0.003% in steel, improve the cleanliness factor of steel; Described continuous casting adopts protection cast, in ladle long nozzle and crystallizer submersed nozzle argon shield; In the time of wire rod rolling, adopt retarded cooling process measure, in the time of described wire rod rolling, laying temperature is controlled at 830～850 DEG C, roller speed is 4～6m/min, and adopt button to cover and close the measure of blower fan, to reduce cooling rate, Φ 5～6mm the wire rod that obtains tensile strength≤770Mpa, the direct drawing that is suitable for postorder becomes the finished product welding wire of Φ 4mm or Φ 3.2mm, and saves annealing operation.
Submerged arc welding wire for steel pipeline steady quality of the present invention, coupling alkalescent sintered flux SJ101, the reach>=668MPa of deposited metal intensity obtaining, ballistic work A
kV(20 DEG C)>=124J, the welding of suitable X80 level Pipeline Steel Plate.The manufacture method of this welding wire for submerged-arc welding is easy, and operation is few, and cost is low, is easy to suitability for industrialized production, is easy to drawing processing, and finished product welding wire moderate strength, is 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, dephosphorization simultaneously, tapping temperature is 1680 DEG C of left and right, and carbon is 0.06%, and tapping process carries out deoxidation alloying.Slag system ingredient: CaO50.0% in LF stove refining process, Al
2o
320.0%, SiO
25.0%, the S in molten steel is 0.002%, and the content of vanadium in steel controls to target call by adding vanadium iron, then other alloying element is adjusted to steel grades requirement, delivers to 280 × 380mm
2on rectangular bloom casting machine platform, pour into a mould, roll into 120 × 120mm through tandem rolling afterwards
2specification square billet to wire rod rolling, adopts high speed twist-free mill Rolling Production to go out Φ 5.5mm wire rod, afterwards wire rod is peeled off, pickling, copper facing, makes Φ 4mm welding wire.Wherein laying temperature is controlled at 830 DEG C when wire rod rolling, and roller speed is 5m/min, adopts button cover and closes the measure of blower fan.The chemical composition of the welding wire of producing by above-mentioned condition is (% by weight): C0.07%, Si 0.15%, Mn1.78%, Ni0.80%, Mo0.25%, Cu0.18%, V0.06%, Al
s0.03%, S0.002%, P0.008%, surplus is Fe and inevitable impurity, the wire rod that the tensile strength of Φ 5.5mm wire rod is 700Mpa.
Welding wire of the present invention mates and carries out deposited metal welding with SJ101-G solder flux, and test plate (panel) is X80 pipeline, and thickness is 24mm, 30 ° of bevel angles, and root gap is 12mm.Welding conditions are: welding current 475～575A, 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 present embodiment deposited metal is in table 1.
Welding wire of the present invention mates with SJ101-G solder flux and carries out X80 level pipe line steel welding, and motherboard is Anshan iron and steel plant X80 level Pipeline Steel Plate, its chemical composition (% by weight): C0.05%, Si0.2%, Mn1.84%, P0.09%, S0.002%, Ni0.2%, Als0.033%.Thickness is 18.4mm, and bevel angle is the double V-groove of 60 °.Welding conditions are: welding current 475～575A, 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 present embodiment weld metal is in table 2.
Embodiment 2: first send converter smelting by the molten steel after desulfurization, dephosphorization simultaneously, tapping temperature is 1690 DEG C, and carbon is 0.06%, and tapping process carries out deoxidation alloying.Wherein slag system ingredient: CaO45% in LF stove refining process, Al
2o
323.0%, SiO
25.0%, the S in molten steel is 0.003%, and the content of vanadium in steel controls to target call by adding vanadium iron, then other alloying element is adjusted to steel grades requirement, delivers to 280 × 380mm
2on rectangular bloom casting machine platform, pour into a mould, roll into 120 × 120mm through tandem rolling afterwards
2specification square billet to wire rod rolling, adopts high speed twist-free mill Rolling Production to go out Φ 5.5mm wire rod, afterwards wire rod is peeled off, pickling, copper facing, makes Φ 4mm welding wire.Wherein laying temperature is controlled at 850 DEG C when wire rod rolling, and roller speed is 5m/min, adopts button cover and closes the measure of blower fan.By the chemical composition of welding wire that above-mentioned condition is produced (% by weight): C0.06%, Si0.16%, Mn1.68%, Ni0.83%, Mo0.25%, Cu0.19%, V0.08%, Al
s0.04%, S0.003%, P0.010%.Surplus is Fe and inevitable impurity.The tensile strength of Φ 5.5mm wire rod is 740Mpa.
Welding procedure and motherboard material are identical with embodiment 1, and the mechanical property of the present embodiment welding wire deposited metal 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, dephosphorization simultaneously, tapping temperature is 1695 DEG C, and carbon is 0.06%, and tapping process carries out deoxidation alloying.Slag system ingredient: CaO.55% in LF stove refining process, Al
2o
324.0%, SiO
26.0%, the S in molten steel is 0.002%, and the content of vanadium in steel controls to target call by adding vanadium iron, then other alloying element is adjusted to steel grades requirement, delivers to 280 × 380mm
2on rectangular bloom casting machine platform, pour into a mould, roll into 120 × 120mm through tandem rolling afterwards
2specification square billet to wire rod rolling, adopts high speed twist-free mill Rolling Production to go out Φ 5.5mm wire rod, afterwards wire rod is peeled off, pickling, copper facing, makes Φ 4mm.Wherein laying temperature is controlled at 876 DEG C when wire rod rolling, and roller speed is 5.9m/min, adopts button cover and closes the measure of blower fan.The welding wire chemical composition (% by weight) of producing by above-mentioned condition: C0.06%, Si 0.16%, Mn1.80%, Ni0.70%, Mo0.25%, Cu0.198%, V0.09%, Al
s0.04%, S0.002%, P0.009%.The tensile strength of Φ 5.5mm wire rod is 748Mpa.
Welding procedure and motherboard material are identical with embodiment 1, and the mechanical property of the present embodiment welding wire deposited metal is in table 1, and the performance of weld metal is in table 2;
The performance of table 1 embodiment of the present invention welding wire deposited metal
The performance of the welding point of table 2 embodiment of the present invention welding wire
Claims (3)
1. a submerged arc welding wire for steel pipeline, the composition that it is characterized in that this welding wire is by weight percentage: C:0.06%～0.07%, Si:0.10%～0.16%, Mn:1.40%～1.90%, Ni:0.40%～1.50%, Mo:0.20%～0.50%, Cu:0.10%～0.30%, V:0.09%～0.20%, Al
s:0.02%～0.07%, S≤0.003%, P≤0.010%, surplus is Fe and inevitable impurity, this welding wire is applicable to X80 level pipe line steel.
2. the manufacture method of submerged arc welding wire for steel pipeline described in a claim 1, comprise peel off-pickling-painting of desulfurizing iron-converter smelting-LF stove refining-continuous casting-wire rod rolling-wire rod borax-copper facing, make finished product welding wire, it is characterized in that the slag system ingredient that described LF refining adopts is: CaO 40.0%～60.0%, Al
2o
315.0%～27.0%, SiO
24.0%～6.0%; Described continuous casting adopts protection cast; In the time of described wire rod rolling, adopt retarded cooling process measure, laying temperature is controlled at 830～850 DEG C, and roller speed is 4～6m/min, detains cover and closes blower fan.
3. the manufacture method of welding wire for submerged-arc welding according to claim 2, is characterized in that described wire rod Φ 5～6mm, described finished product welding wire Φ 4mm or Φ 3.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010201749.4A CN102267021B (en) | 2010-06-07 | 2010-06-07 | Submerged arc welding wire for pipeline steel and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010201749.4A CN102267021B (en) | 2010-06-07 | 2010-06-07 | Submerged arc welding wire for pipeline steel and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102267021A CN102267021A (en) | 2011-12-07 |
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| CN106521317B (en) * | 2016-11-18 | 2018-06-26 | 东北大学 | A kind of manufacturing method containing acicular ferrite low-carbon Thin Strip Steel |
| CN109202329A (en) * | 2017-07-05 | 2019-01-15 | 昆山中冶宝钢焊接材料有限公司 | A kind of 690MPa grades of welding wire for submerged-arc welding of yield strength meeting -60 DEG C of requirements |
| CN108747084A (en) * | 2018-08-14 | 2018-11-06 | 四川西冶新材料股份有限公司 | A kind of welding wire for submerged-arc welding and preparation method thereof |
| CN109852889B (en) * | 2019-04-02 | 2021-01-08 | 鞍钢股份有限公司 | Economical wire rod for 460 MPa-grade weather-resistant stud, production method and stud |
| CN110524138B (en) * | 2019-08-27 | 2021-09-10 | 西安理工大学 | X80 pipeline steel submerged arc welding wire with low cost and good low-temperature toughness |
| 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 |
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| CN1727108A (en) * | 2004-05-18 | 2006-02-01 | 株式会社神户制钢所 | Welding wire for modified 9Cr-1Mo steel, and submerged-arc welding material |
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