CN101537549B - High-strength and high-toughness automatic submerged arc welding wire with weathering resistance - Google Patents
High-strength and high-toughness automatic submerged arc welding wire with weathering resistance Download PDFInfo
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- CN101537549B CN101537549B CN2009100615823A CN200910061582A CN101537549B CN 101537549 B CN101537549 B CN 101537549B CN 2009100615823 A CN2009100615823 A CN 2009100615823A CN 200910061582 A CN200910061582 A CN 200910061582A CN 101537549 B CN101537549 B CN 101537549B
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Abstract
The invention relates to a high-strength and high-toughness automatic submerged arc welding wire with weathering resistance and mainly aims at overcoming disadvantages of poor atmospheric corrosion resistance, high production cost and the like of the existing submerged arc welding materials. In term of technical measures, the welding wire is made from the following chemical components by weight percent: C: 0.05-0.12, Si: 0.01-0.10, Mn: 1.50-2.1. S: not more than 0.015, P: not more than 0.020, Ni: 0.20-0.60, Cr: 0.20-0.50, Cu: 0.25-0.50, Ti: 0.05-0.16, B: 0.002-0.010, Als: 0.001-0.015, Fe and other unavoidable impurities. The welding wire is matched with a basic sintered flux for welding, a weld joint has excellent atmospheric corrosion resistance and comprehensive mechanical properties, and a deposited metal at a weld seam has tensile strength up to 560MPa and ballistic work up to 107J at -40 DEG C and up to 87J at -50 DEG C.
Description
Technical field
The present invention relates to the Lincoln weld wire material that a kind of Metal Material Welding is used, be particularly useful for welded high-strength-and-toughness and have the Lincoln weld welding wire of the steel grade that high-weatherability can require.
Background technology
Along with the high speed development of Chinese national economy, the railway transportation industry enters the high-speed developing period.In recent years, railway track has successively carried out raising speed by a large scale six times, has begun to take shape the acceleration network of " four vertical two horizontal strokes ".For further satisfying the supporting demands of new steel grade key project welding material such as Ministry of Railways's speed-raising loss of weight and bridge spanning the sea, naval vessel, ocean, oil pipeline, engineering machinery, the steel for welded structures of new generation of high-weatherability, high strength, high tenacity will be adopted generally.Contain the atmospheric corrosion resistance that microalloy elements such as Cu, Cr, Ni, Ti, RE, Mn improve steel grade in these steel, the intensity rank of weather-proof steel grade of new generation is 500-600MPa.To the demands for higher performance of welding point, welding point must have obdurability and the weather resistance suitable with base material.There is not the weathering steel welding wire for submerged-arc welding in the existing welding wire national standard, specification requirement WER44-8 (III) the welding wire for submerged-arc welding intensity rank of the former standard laid down by the ministries or commissions of the Central Government TB/T2374-1999 of the Ministry of Railways is 440MPa, far can not need the supporting demands of high-level new steel grade key project welding material such as sufficient railway speed increase loss of weight, bridge spanning the sea, marine ship, oil pipeline, engineering machinery.Along with improving constantly of intensity, toughness and the weather resistance of high-level new steel grade, it is bigger that its welding seam toughness, weatherability and base material are compared gap, and the annual a large amount of imports of high-strength weather-proof series welding material can't be satisfied domestic key project demand.Chinese patent 00114334.4, its alloy system is Ni-Mo-Ti, though satisfied the needs of high-tensile rank 600-700MPa, but deficiency is the welding that only is suitable for making the low alloy steel plate of pressure vessel, especially do not have weatherability, and owing to contain Mo, its present price is very expensive, makes production cost higher.Chinese patent 97104393.0, its alloy system is Ni-Ti-B, it is suitable for the welding of large-line energy, the butt welding groove has stronger adaptability, but being still, its deficiency do not have weatherability, be not suitable for the submerged arc welding materials demand with weather resistance of the required coupling of weather-proof steel series that industries such as China railways speed-raising loss of weight, bridge spanning the sea, engineering machinery, petrochemical industry, marine ship develop atmospheric corrosion resistance, press for Development of New Generation high-weatherability high-strength and high-toughness automatic submerged arc welding wire.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, a kind of weather resistance that has is provided, and high-intensity high-tenacity, be used for the welding of 500MPa and above intensity rank steel grade, when mating with alkalescent sintered flux, postwelding weld seam tensile strength reaches more than the 560MPa,-40 ℃ of weld seam ballistic works reach 107J, and-50 ℃ of weld seam ballistic works reach 87J, and joint has the weather-resistant and high-strength degree high tenacity automatic submerged arc welding wire of obdurability coupling and corrosion resistance.
Realize the above-mentioned purpose technology contents:
To achieve these goals, its technical measures: have the high-strength and high-toughness automatic submerged arc welding wire of weather resistance, it is the chemical composition and the percentage by weight of welding wire: C:0.05～0.12, Si:0.001～0.10, Mn:1.50～2.1, S≤0.015, P≤0.020, Ni:0.20～0.60, Cr:0.20～0.50, Cu:0.25～0.50, Ti:0.05～0.16, B:0.002～0.010, Als:0.001～0.015, surplus is that Fe inevitably is mingled with other.
It is that the percentage by weight of Ni is 0.25～0.45.
It is that the percentage by weight of Ni is 0.30～0.40.
It is that the percentage by weight of Cr is 0.25～0.45.
It is that the percentage by weight of Cr is 0.30～0.40.
It is that the percentage by weight of Ti is 0.08～0.14.
It is that the percentage by weight of Ti is 0.10～0.13.
It is that the percentage by weight of B is 0.004～0.009.
It is that the percentage by weight of B is 0.006～0.007.
It is that the percentage by weight of Als is 0.002～0.010.
The present invention welds and adopts alkalescent sintered flux as the coupling solder flux, adopts submerged arc automatic.
Intensity that the weathering steel welding point is had relatively high expectations and low-temperature impact toughness and good atmospheric corrosion resistance.This welding wire has taken into full account these requirements in the chemical composition design, select for use alkalescent sintered flux as the coupling solder flux.C, Mn, Ni guarantee the enough intensity of weld seam in the welding wire, improve the toughness of weld seam; Proper C u, Cr butt welding are sewed with invigoration effect, increase the atmospheric corrosion resistance of weld seam; Trace Ti, B help suppressing in the weld seam austenite crystal and grow up, and postpone austenite to ferritic transition temperature, impel the formation of weld metal intracrystalline acicular ferrite, the refinement subgrain.Low S, P content improve weld seam degree of purity and performance, further improve the weld seam weather resistance.It specifically acts on:
The C percentage by weight is controlled at 0.05-0.12 in the welding wire of the present invention, and the obdurability of C constituent content butt welded seam and tissue thereof are formed bigger influence.When C content was low, weld strength was lower, and ratio of ferrite is higher in the weld metal.When C content was higher, welding seam toughness descended, and weld seam medium pearlite ratio increases.Therefore, C too high levels or mistake are hanged down and all can be influenced acicular ferrite content in the weld seam.
The Si percentage by weight is controlled at 0.001-0.10 in the welding wire of the present invention, and the Si in the base material of welding back partly carries out the transition to weld seam, and si content is controlled at below 0.3% in the weld seam.
The Mn percentage by weight is controlled at 1.50-2.1 in the welding wire of the present invention, and Mn is the effective element of weld seam Strengthening and Toughening, helps deoxidation in weld seam, prevents to cause the formation of fire check and iron sulfide.When the Mn percentage by weight was at 1.20-1.60 in the weld seam, the weld seam obdurability reached best coupling.
The Ni percentage by weight is controlled at 0.20-0.60 in the welding wire of the present invention, and the toughness that Ni helps improving weld metal is low-temperature impact toughness especially, reduces brittle transition temperature.Improve the weld seam corrosion resisting property simultaneously.When Ni content was too high, welding wire intensity and hardness were too high, and Ni content causes weld seam and mother metal composition difference big, and the welding wire cost is increased.
The Cr percentage by weight is controlled at 0.20-0.50 in the welding wire of the present invention, contain certain Cr element in the weld seam and help improving acicular ferrite content in the weld seam, reduce pro-eutectoid ferrite, and the effect of refinement ferrite crystal grain is arranged, improve the weld seam obdurability, improve the weld seam corrosion resisting property simultaneously.Performance maintained higher level after Cr also helped to keep weld seam heat treatment.
Cu percentage by weight control content improved weld strength less than 0.5 o'clock in the solution strengthening mode, and reduced the acicular ferrite initial transition temperature, improved acicular ferrite content; When Cu percentage by weight control content greater than 0.5 the time, separating out the mode strengthen welds, but butt welded seam toughness is unfavorable.Therefore Cu percentage by weight in the welding wire is controlled at 0.10～0.50.
Adding Ti in the welding wire of the present invention can thinning weld metal structure.Ti and N have high affinity, and Ti and N are combined into the TiN particle, as nucleus, impel the formation of acicular ferrite in the weld seam.The Ti percentage by weight is controlled at 0.01-0.04 in the weld metal, considers certain transfer coefficient, and therefore, the Ti percentage by weight control in the welding wire of the present invention can rise to 0.05-0.16.
The B percentage by weight is controlled at 0.002-0.010 in the welding wire of the present invention, the B of solid solution assembles reduction crystal boundary energy at austenite grain boundary, can control separating out of pro-eutectoid ferrite, B is deferrable austenite → ferritic phase transition temperature also, helps the formation of intragranular acicular ferrite.
S, P element are the main harmful elements in the weld seam, and they significantly reduce the weld metal low-temperature impact toughness.S is an inevitable element in the welding wire, and welding wire steel should reduce S content when smelting as far as possible.The alkaline species solder flux of welding wire of the present invention and low S content such as CHF101 solder flux coupling is used, and can make that S content is controlled at reduced levels in the weld seam.
Welding wire of the present invention adopts electric furnace or converter smelting, does not have special smelting process requirement.
Automatic submerged arc welding wire of the present invention has following advantage:
1, this welding wire has good performances such as atmospheric corrosion resistance.
2, welding wire of the present invention is used for the welding of 550MPa and above intensity rank steel construction, and weld seam has and base material higher strength and toughness coupling and good joint performance.
3, stable being easy to of this welding wire steel smelting process realized, function admirables such as drawing of the rolling and welding wire of steel billet dialled, copper facing.
The specific embodiment
Embodiment 1
Utilize 0.5 ton of this welding wire of electric furnace smelting, dial into welding wire gage of wire 4mm, copper coating with drawing through rolling.Its finished product composition is: C:0.06, Si:0.041, Mn:1.68, Ni:0.43, Cr:0.26, Ti:0.10, Cu:0.26, B:0.0057, Als:0.009.All the other inevitably are mingled with other for Fe.Adopt CHF101 solder flux coupling to carry out the deposited metal soldering test, welding current is 600A, and weldingvoltage is 31V, and speed of welding is 35cm/min.Interlayer temperature≤150 ℃.Weld metal yield strength ReL=425MPa, tensile strength Rm=560MPa, percentage elongation A=26%, contraction percentage of area Z=75%.The average ballistic work Akv in weld(ing) deposit (20 ℃)=147J, Akv (40 ℃)=107J, Akv (50 ℃)=87J, weld seam have good obdurability coupling and low-temperature impact toughness.Satisfy the supporting solder technology requirement of economical high-weatherability steel grade of new generation.
Embodiment 2
Utilize 0.5 ton of this welding wire of electric furnace smelting, dial into welding wire gage of wire 4mm, copper coating with drawing through rolling.Its finished weight composition is: C:0.07, Si:0.040, Mn:1.60, Ni:0.41, Cr:0.30, Ti:0.12, Cu:0.29, B:0.006, Als:0.005.All the other inevitably are mingled with other for Fe.The CHF101 solder flux coupling that welding wire and Atlantic Ocean welded articles Co., Ltd produce, the thick offshore platform steel WNHS315 of new generation of welding 20mm, the chemical composition of steel (% by weight) mainly contains C:0.061, Si:0.28, Mn:1.37, Nb:0.047, Mo:0.27, P:0.008, S:0.005.Rm＝510MPa、ReL＝316MPa、Akv(-0℃)＝268J。Welding procedure is a Y type groove.Root face is 6mm, and bevel angle is one-sided to be 35 °, and welding condition is welding current 650A, and weldingvoltage 31V welds fast 35cm/min.The tensile strength Rm=505MPa of joint, clod wash d=3a, 180 ° qualified.Weld seam ballistic work Akv (20 ℃)=91J, Akv (40 ℃)=69J, melt run ballistic work Akv (20 ℃)=125J, Akv (40 ℃)=81J, hot shadow zone ballistic work Akv (20 ℃)=177J, Akv (40 ℃)=136J, joint three district's ballistic works reach higher level.Submerged-arc welding joint overheated zone is mainly bainite structure, and weld metal is mainly tiny acicular ferrite structure, thereby less weld seam three districts that make of proeutectoid ferrite soma have higher low-temperature impact toughness.Carry out full welding line joint electrochemical corrosion test, experimental condition: weld joint samples is polished,, make the naked eyes can clear resolution base material---heat affected area (HAZ)-weld seam through 3% nitric acid alcohol etch.Each district makes reference with calomel electrode, at room temperature, adopts the microcell electrochemical techniques.In 3%NaCl solution, what record when stablizing 2 minutes respectively distinguishes average corrosion potential: base material: negative 479 millivolts, heat affected area (HAZ): negative 483 millivolts, weld seam: negative 485 millivolts.It is all little that welding point is respectively distinguished potential difference, and test explanation welding wire of the present invention and offshore platform steel WNHS315 matched junction of new generation have the superior corrosion resistance energy.The weld seam combination property satisfies offshore platform steel WNHS315 coupling solder technology condition of new generation.
Embodiment 3
Utilize 0.5 ton of this welding wire of electric furnace smelting, dial into welding wire gage of wire 4mm, copper coating with drawing through rolling.The weight chemical analysis of its welding wire is: C:0.09, Si:0.060, Mn:1.90, Ni:0.41, Cr:0.35, Ti:0.15, Cu:0.35, B:0.009, Als:0.012.All the other inevitably are mingled with other for Fe.Welding wire and CHF101 solder flux coupling, the thick offshore platform steel E36 of welding 20mm, weight chemical composition: C:0.12, Si:0.28, Mn:1.48, Ni (Nb): 0.020, Mo:0.036, P:0.008, S:0.005.Rm＝535MPa、ReL＝360MPa、Akv(-0℃)＝96J。Welding procedure is identical with embodiment 2.The tensile strength Rm=520MPa of joint, clod wash d=3a, 180 ° qualified.Weld seam ballistic work Akv (0 ℃)=144J, Akv (20 ℃)=73J, melt run ballistic work Akv (0 ℃)=88J, Akv (20 ℃)=100J, hot shadow zone ballistic work Akv (0 ℃)=95J, Akv (20 ℃)=63J, joint three district's ballistic works reach higher level.Submerged-arc welding joint overheated zone is mainly bainite structure, and weld metal is mainly tiny acicular ferrite structure, thereby less weld seam three districts that make of proeutectoid ferrite soma have higher low-temperature impact toughness.Carry out full welding line joint electrochemical corrosion test.Experimental condition: weld joint samples is polished,, make the naked eyes can clear resolution base material-heat affected area (HAZ)-weld seam through 3% nitric acid alcohol etch.Each district makes reference with calomel electrode, at room temperature, adopts the microcell electrochemical techniques.In 3%NaCl solution, what record when stablizing 2 minutes respectively distinguishes average corrosion potential: base material: negative 488 millivolts, heat affected area (HAZ): negative 475 millivolts, weld seam: negative 482 millivolts.It is all little that welding point is respectively distinguished potential difference, and test explanation welding wire of the present invention and offshore platform steel E36 coupling have the superior corrosion resistance energy.The weld seam combination property satisfies offshore platform steel E36 coupling solder technology condition.
Embodiment 4
Utilize 0.5 ton of this welding wire of electric furnace smelting, dial into welding wire gage of wire 4mm, copper coating with drawing through rolling.Its welding wire weight chemical composition is: C:0.10, Si:0.07, Mn:1.70, Ni:0.45, Cr:0.29, Ti:0.13, Cu:0.30, B:0.005, Als:0.006.All the other inevitably are mingled with other for Fe.The CHF101 solder flux coupling that welding wire and Atlantic Ocean welded articles Co., Ltd produce, the welding thick high-intensity high-tenacity Weather-resistance bridge steel of new generation of 32mm (Beijing-Shanghai bridge WNQ570), the main chemical compositions of WNQ570 steel (% by weight) is C:0.05, Si:0.40, Mn:1.58, P:0.015, S:0.008.Rm＝595MPa、ReL＝475MPa、Akv(-40℃)＝278J。Welding condition is welding current 630A, and weldingvoltage 31V welds fast 34m/min.The intensity 590MPa of welding point, cold-bending property is good, weld seam ballistic work Akv (20 ℃)=150J, Akv (20 ℃)=100J, Akv (40 ℃)=71J, heat affected area Akv (20 ℃)=195J, Akv (20 ℃)=173J, Akv (40 ℃)=117J, joint three district's ballistic works reach higher level.Submerged-arc welding joint overheated zone is mainly bainite structure, and weld metal is mainly tiny acicular ferrite structure, thereby less weld seam three districts that make of proeutectoid ferrite soma have higher low-temperature impact toughness.Carry out full welding line joint electrochemical corrosion test.Experimental condition: weld joint samples is polished,, make the naked eyes can clear resolution base material-heat affected area (HAZ)-weld seam through 3% nitric acid alcohol etch.Each district makes reference with calomel electrode, at room temperature, adopts the microcell electrochemical techniques.In 3%NaCl solution, what record when stablizing 2 minutes respectively distinguishes average corrosion potential: base material: negative 511 millivolts, heat affected area (HAZ): negative 494 millivolts, weld seam: negative 503 millivolts.It is all little that welding point is respectively distinguished potential difference, and test explanation welding wire of the present invention and high-intensity high-tenacity Weather-resistance bridge steel of new generation (WNQ570) matched junction have the superior corrosion resistance energy.The weld seam combination property satisfies high-intensity high-tenacity Weather-resistance bridge steel of new generation (WNQ570) coupling solder technology condition.
Embodiment 5
Utilize 0.5 ton of this welding wire of electric furnace smelting, dial into welding wire gage of wire 4mm, copper coating with drawing through rolling.Its welding wire weight chemical composition is: C:0.12, Si:0.08, Mn:2.0, Ni:0.45, Cr:0.45, Ti:0.15, Cu:0.40, B:0.008, Als:0.013.All the other inevitably are mingled with other for Fe.Welding wire and CHF101 solder flux coupling, the speed-raising loss of weight railway locomotive steel W400QN of welding a new generation, thickness 12mm.The chemical composition of W400QN steel (% by weight) mainly contains C:0.07, Si:0.39, Mn:0.35, Ni:0.30, Cu:0.30, Cr:0.42, P:0.09, S:0.006.Mechanical performance ReL:410MPa, Rm:535MPa.Akv (40 ℃)=88J.Carried out full welding line joint corrosive nature test.Adopted 2 samples to carry out joint electrochemical corrosion test altogether.Experimental condition and result of the test: weld joint samples is polished,, make the naked eyes can clear resolution base material-HAZ-weld seam through 3% nitric acid alcohol etch.Each district makes reference with calomel electrode, at room temperature, adopts the microcell electrochemical techniques.In 3%NaCl solution, record when stablizing 2 minutes and respectively distinguish corrosion potential.Base material electrochemical corrosion test welding point is respectively distinguished current potential: base material: negative 534 millivolts, heat affected area (HAZ): negative 532 millivolts, weld seam: negative 531 millivolts.It is all little that welding point is respectively distinguished potential difference, and test explanation welding wire of the present invention and weather-proof locomotive steel W400QN matched junction of new generation have the superior corrosion resistance energy.The weld seam decay resistance satisfies weather-proof locomotive steel W400QN coupling solder technology condition of new generation.
Claims (7)
1. the high-strength and high-toughness automatic submerged arc welding wire that has weather resistance, the chemical composition and the percentage by weight that it is characterized in that welding wire: C:0.05～0.12, Si:0.001～0.08, Mn:1.50～2.1, S≤0.015, P≤0.020, Ni:0.20～0.45, Cr:0.26～0.35, Cu:0.25～0.50, Ti:0.05～0.16, B:0.002～0.010, Als:0.001～0.015, surplus are that Fe inevitably is mingled with other.
2. the high-strength and high-toughness automatic submerged arc welding wire with weather resistance according to claim 1, the percentage by weight that it is characterized in that Ni is 0.30～0.40.
3. the high-strength and high-toughness automatic submerged arc welding wire with weather resistance according to claim 1, the percentage by weight that it is characterized in that Ti is 0.08～0.14.
4. according to claim 1 or 3 described high-strength and high-toughness automatic submerged arc welding wires with weather resistance, the percentage by weight that it is characterized in that Ti is 0.10～0.13.
5. the high-strength and high-toughness automatic submerged arc welding wire with weather resistance according to claim 1, the percentage by weight that it is characterized in that B is 0.004～0.009.
6. the high-strength and high-toughness automatic submerged arc welding wire that has weatherability according to claim 1 or 5, the percentage by weight that it is characterized in that B is 0.006～0.007.
7. the high-strength and high-toughness automatic submerged arc welding wire with weather resistance according to claim 1, the percentage by weight that it is characterized in that Als is 0.002～0.010.
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| CN105458549A (en) * | 2015-12-18 | 2016-04-06 | 钢铁研究总院 | Submerged arc welding wire for reactor supporting structure steel |
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