CN104117789A - Low temperature steel flux-cored welding wire - Google Patents

Low temperature steel flux-cored welding wire Download PDF

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Publication number
CN104117789A
CN104117789A CN201410382708.8A CN201410382708A CN104117789A CN 104117789 A CN104117789 A CN 104117789A CN 201410382708 A CN201410382708 A CN 201410382708A CN 104117789 A CN104117789 A CN 104117789A
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flux
welding wire
welding
cored
low
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CN201410382708.8A
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CN104117789B (en
Inventor
张亚平
刘玉双
吕奎清
田海成
李磊
韩海峰
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Wuhan Tiemiao Welding Materials Co Ltd
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Wuhan Tiemiao Welding Materials Co Ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B23K35/0266—Rods, electrodes, wires flux-cored

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The invention belongs to the technical field of welding materials, and provides a low temperature steel flux-cored welding wire. The low temperature steel flux-cored welding wire comprises a carbon steel shell and a flux core. The carbon steel shell accounts for 80-86% of the total mass of the welding wire, the flux core accounts for 14-20% of the total mass, and the flux core comprises, by weight accounting for the proportion of the total mass of the welding wire, 4.2-6% of TiO2, 0.24-0.6% of one of NaF and CaF2 or the mixture of NaF and CaF2, 0.6-1.4% of SiO2, 0.48-1.2% of ferrotitanium alloy, 0.15-0.44% of rare earth alloy, 0.36-0.5% of Mg, 0.5-1.5% of Mn, 0.12-0.3% of Fe3O4, 2.64-3.5% of Ni, 0.72-1.6% of ferroboron, 0.05-0.3% of ZrO2, and the balance iron powder. The titanium-alkali slag system is adopted, certain Ni content is guaranteed, the appropriate amount of Ti, B and Zr is added, weld metal grains are thin and small, and therefore the stable high tenacity weld joint is obtained.

Description

A kind of low-temperature steel flux-cored wire
Technical field
The invention belongs to technical field of welding materials, relate in particular to a kind of low-temperature steel flux-cored wire.
Background technology
Low-temperature steel is according to using calibration to be divided into four ranks :-20 DEG C～-40 DEG C ,-50 DEG C～-80 DEG C ,-100 DEG C～-110 DEG C ,-196 DEG C～-269 DEG C, be mainly used in the storage cask of liquefied petroleum gas and liquefied natural gas etc., and Offshore Engineering structure etc.From consulted reference materials statistical analysis, it is all welding rod substantially that current domestic welding business men is produced the wlding meeting on-80 DEG C of low temperature environment military service equipment.Flux-cored wire production efficiency is high, and welding technological properties is good, and this welding manner has wide range of applications, and is therefore necessary to develop the flux-cored of a kind of being applicable to-80 DEG C low temperature environment military service.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of low-temperature steel flux-cored wire, this flux-cored wire can be on active service at-80 DEG C of low temperature environments.
The present invention adopts following technical scheme:
A kind of low-temperature steel flux-cored wire, comprise carbon steel crust and be placed in the medicine core of described carbon steel crust, described carbon steel crust accounts for 80～86% of welding wire gross mass, described medicine core accounts for 14～20% of gross mass, and it is as follows that the composition that wherein said medicine core comprises and each composition account for the per distribution ratio of welding wire gross mass:
The invention has the beneficial effects as follows: flux-cored wire first of the present invention adopts titanium-alkali type slag system, has the operating procedure that rutile type slag is good, has again certain alkalescence, when use, welding arc stablility, slag fluidity is good, and appearance of weld is attractive in appearance; Secondly, in medicine core, by adding Mg, Mn, Ti, Si, carry out weld seam combined deoxidation, reduce the oxygen content in weld seam as far as possible, improve weld metal cracking resistance and low-temperature flexibility, be conducive to the moulding of weld seam; In addition, in medicine core, pass through to add ferro-titanium, ferro-boron and the ZrO of proper ratio 2, ensureing, under the prerequisite of weld strength, to determine the relation of Mn/Ni ratio in weld metal, Mn/Si ratio, (Ti+Zr)/B ratio and toughness, improved weld seam-80 DEG C low-temperature impact toughness.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, by specific embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the present invention provides a kind of low-temperature steel flux-cored wire, comprise carbon steel crust and be placed in the medicine core of described carbon steel crust, described carbon steel crust accounts for 80～86% of welding wire gross mass, flux-cored wire adopts the sealing mode of docking O type or overlap joint O type, described flux-cored diameter is 1.2mm, described medicine core accounts for 14～20% of gross mass, and it is as follows that the composition that wherein said medicine core comprises and each composition account for the per distribution ratio of welding wire gross mass:
In above-mentioned raw materials component:
TiO 2it is the main component that forms welding slag.Add TiO 2can make stable arc in the time of welding, reduce spatter, improve slag spreadability and the removability of slag.In addition, TiO 2can improve slag fluidity, make all-position welding operation become convenient and easily grasp.As TiO in medicine core 2while measuring very little, above-mentioned feature is not obvious; As TiO in medicine core 2measure when too much, not only destroyed the spreadability of slag, and mechanical property is produced to harmful effect.Therefore, TiO 2account for 4.2～6% of described flux-cored wire gross weight.
SiO 2also be the main component of slag.SiO 2can regulate slag fusing point and viscosity, improve appearance of weld, be conducive to weld seam to mother metal rounding off; Slag and weld interface are increased, make slag there is good spreadability.As SiO in medicine core 2addition can not embody above-mentioned feature, SiO when few 2when addition is large, in weld seam, oxygen content raises, and reduces the low-temperature impact toughness of weld metal.Therefore, SiO 2account for 0.6～1.4% of described flux-cored wire gross weight.
NaF and CaF 2can dehydrogenation, in the present embodiment, select both one of or get both mixtures, the excessive arc stability of addition is bad, increases spatter and flue dust,, easily there is pore load mould in the very few dehydrogenation scarce capacity of addition.Therefore, NaF, CaF 2in a kind of or both mixing account for 0.24～0.6% of described flux-cored wire gross weight.
ZrO 2can improve slag fusing point, viscosity and surface tension, make slag well be covered in weld seam, slag and molten iron tenesmus while preventing vertical position welding.ZrO 2the few above-mentioned feature of addition is not obvious, and addition is too high, and slag fusing point is too high, and poor fluidity reduces the low-temperature flexibility of weld metal simultaneously.Transition trace Zr element, coordinates with Ti, B, and crystal grain thinning, makes weld metal microalloying, carries the high-intensity while and can improve low-temperature impact toughness.ZrO 2account for 0.05～0.3% of described flux-cored wire gross weight.
Fe 3o 4can dilute slag, cause suitable slag surface tension and viscosity, improve the wellability of slag and molten iron.Add Fe 3o 4when amount is greater than 0.3%, slag surface tension is too small, and slag can not hold molten iron, vertical welding difficulty downwards.Therefore, Fe 3o 4account for 0.12～0.3% of described flux-cored wire gross weight.
Ni both can improve intensity, favourable to improving low-temperature impact toughness again.But Ni too high levels can increase hot tearing sensitiveness.Therefore, Ni accounts for 2.64～3.5% of described flux-cored wire gross weight.
Mn is main deoxidier, for reducing the oxygen content of weld metal, increases weld metal intensity and crack resistance, improves low-temperature impact toughness, regulates molten iron flow.While adding Mn amount to be greater than 1.5%, weld strength is too high, and low-temperature impact toughness reduces.Therefore account for Mn and account for 0.5～1.5% of described flux-cored wire gross weight.
Mg is strong deoxidier, for improving low-temperature impact toughness, improves low-temperature impact toughness scarce capacity when addition is less than, while adding Mg amount to be greater than 0.5%, rise because deoxidation products magnesium oxide makes the fusing point of slag, setting rate is accelerated, and is unfavorable for eliminating and the appearance of weld of weld seam gas.Therefore, Mg accounts for 0.36～0.5% of described flux-cored wire gross weight.
Rare earth alloy can fixed nitrogen, large with the affinity of sulfur impurity, changes the shape, quantity and the distribution that are mingled with matter, reduces the illeffects that is mingled with confrontation toughness.
Ferro-titanium adds as main deoxidier, the Ti of transition simultaneously element, crystal grain thinning.
Ferro-boron adds as deoxidier, and the B of transition simultaneously element, coordinates crystal grain thinning with Ti, Zr.There is no enough Ti and Zr, B is not obvious on the impact of raising impact flexibility, in the time that (Ti+Zr)/B ratio is 8～17, improves playing a role clearly of impact flexibility.
Fe is iron powder, can improve welding arc state, regulates molten iron fusing point and viscosity, and surplus adds.
In the present embodiment scheme, medicine core adopts titanium-alkali type slag system, coordinates CO when welding 2gas shield, has the processing performance of general rutile type slag, has again suitable basicity; Welding arc stablility, evenly, slag fluidity is good in fusing, and appearance of weld is attractive in appearance, and full position operation technique is good.Weld metal stable mechanical property, crack resistance are good, meet-80 DEG C of low-temperature flexibility requirements.In production process, take corresponding measure, further control diffusible hydrogen content.Secondly, medicine core adopts the mode of Mn-Mg-Ti-Si combined deoxidation, can reduce the oxygen content in weld seam as far as possible; In slag making component, add stabilising arc material, to meet the requirement of operative weldability energy; Add a large amount of iron powders, improve its deposition efficiency.The 3rd, by controlling ferro-titanium, ferro-boron, ZrO 2proportioning, add trace alloying element, realize the microalloying of weld seam, make this flux-cored wire reach good mating with mother metal in mechanical property, welding use time, adopt CO 2gas shielded welding, after tested, the Mn/Ni ratio of weld metal is that 0.17～0.22, Mn/Si ratio is 1.9～2.5, (Ti+Zr)/B ratio is 8～17, has improved weld seam-80 DEG C low-temperature impact toughness.Finally, by adding rare earth alloy, reduce in weld metal S content and change inclusion morphology, thereby improving low-temperature flexibility.
In the embodiment of the present invention, the drug core component of welding wire can be chosen arbitrarily in above-mentioned limited range, verifies the processing performance of flux-cored wire provided by the invention below by six instantiations.The drug core component proportioning (accounting for flux-cored wire total weight percent) of six embodiment is as shown in table 1 below:
Drug core component Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Embodiment 6
TiO 2 4.2 6 5.5 4.2 6 5
A kind of or both mixtures in NaF, CaF2 0.35 0.6 0.24 0.6 0.24 0.6
SiO 2 0.9 0.6 1.4 1.4 0.6 0.9
Ferro-titanium 0.48 0.8 1.2 0.8 1.2 0.48
Rare earth alloy 0.15 0.27 0.44 0.27 0.27 0.44
Mg 0.36 0.4 0.5 0.5 0.4 0.4
Mn 0.5 0.8 1.3 1.5 1.0 1.0
Fe 3O 4 0.12 0.2 0.3 0.2 0.2 0.2
Ni 3.5 2.64 3.2 3.2 2.88 2.88
Ferro-boron 1.1 1.6 0.72 1.1 1.05 0.72
ZrO 2 0.1 0.3 0.05 0.05 0.3 0.3
Fe and inevitably impurity Surplus Surplus Surplus Surplus Surplus Surplus
Filling rate (medicine core accounts for welding wire total weight percent) 20 16 15 14 16 20
Table 1
The flux-cored wire obtaining by above-mentioned six embodiment proportionings is carried out to soldering test, adopt CO 2gas shielded welding, chemical composition in deposited metal (mass fraction %) test, result is as following table 2:
Table 2
As can be seen from Table 2, in weld metal, Mn/Ni ratio is 0.17～0.22, Mn/Si ratio is 1.9～2.5, (Ti+Zr/) B ratio is 8～17, is the weld metal taking ferrite as matrix for Ni, and the topmost factor that affects its low-temperature flexibility is the ferritic quantity of ferrite grain size and fine acicular, the embodiment of the present invention is controlled at the ratio of (Ti+Zr)/B, Mn/Si, Mn/Ni in above-mentioned scope, has improved weld seam-80 DEG C low-temperature impact toughness.
In above-mentioned six embodiment, the deposited metal that welding test is obtained carries out Mechanics Performance Testing, and result is as shown in table 3 below:
Numbering R el/MPa R m/MPa A/％ KV 2-60 DEG C of ballistic works KV 2-80 DEG C of ballistic work average/J
Embodiment 1 467 542 24.5 110 69
Embodiment 2 488 569 26 98 55
Embodiment 3 452 548 25.5 105 63
Embodiment 4 479 554 23.5 118 81
Embodiment 5 470 561 26 122 77
Embodiment 6 488 580 24.5 101 61
Table 3
As can be seen from Table 3, deposited metal-60 DEG C KV 2average > 90J ,-80 DEG C of KV 2average > 47J; Deposited metal stable mechanical property, crack resistance are good.
In addition, the flux-cored wire being made by above-mentioned six embodiment is carried out to flat banjo fixing butt jointing welding and the performance test of vertical banjo fixing butt jointing welding mechanics, result is respectively as shown in table 4 and table 5:
Numbering R m/MPa KV 2-60 DEG C of ballistic work average/J KV 2-80 DEG C of ballistic work averages Positive recurvation (120 °～180 °)
? ? ? /J ?
Embodiment 1 557 95 55 Well
Embodiment 2 577 88 51 Well
Embodiment 3 563 83 56 Well
Embodiment 4 569 103 59 Well
Embodiment 5 577 115 61 Well
Embodiment 6 581 80 49 Well
The flat banjo fixing butt jointing mechanical property of table 4
Table 5 banjo fixing butt jointing mechanical property
In order to detect the cold crack sensitiveness of weld seam, carry out oblique Y type groove welding test.After testing, tiltedly crackle is not found in Y test.Examine by actual joint, can obtain qualified joint, meet Product jointing needs.
Finally, in above-mentioned six embodiment, the metallisation that welding test obtains carries out diffusible hydrogen test (mercury process), and test result is as shown in table 6 below:
Table 6
Deposited metal diffusible hydrogen content mercury process testing result < 5ml/100g, meets the demands.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (3)

1. a low-temperature steel flux-cored wire, comprise carbon steel crust and be placed in the medicine core of described carbon steel crust, it is characterized in that, described carbon steel crust accounts for 80～86% of welding wire gross mass, described medicine core accounts for 14～20% of gross mass, and it is as follows that the composition that wherein said medicine core comprises and each composition account for the per distribution ratio of welding wire gross mass:
2. low-temperature steel flux-cored wire as claimed in claim 1, is characterized in that, the sealing mode of described flux-cored employing docking O type or overlap joint O type.
3. low-temperature steel flux-cored wire as claimed in claim 2, is characterized in that, described flux-cored diameter is 1.2mm.
CN201410382708.8A 2014-08-06 2014-08-06 A kind of low-temperature steel flux-cored wire Active CN104117789B (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104439760A (en) * 2014-11-21 2015-03-25 宁波隆兴焊割科技股份有限公司 Flux-cored wire for welding low-temperature steel and preparation method thereof
CN104588904A (en) * 2014-11-21 2015-05-06 宁波隆兴焊割科技股份有限公司 High-tenacity and low-yield-ratio flux-cored wire and preparing method thereof
CN104588915A (en) * 2014-12-09 2015-05-06 天津大桥金属焊丝有限公司 Gas shield build-up welding flux-cored wire for hot-forging die
CN104785954A (en) * 2015-04-17 2015-07-22 上海焊接器材有限公司 High-strength and high-tenacity basic flux cored wire
CN106695171A (en) * 2017-02-09 2017-05-24 首钢总公司 Flux-cored wire for non gas shielded welding
CN107498213A (en) * 2017-10-18 2017-12-22 镇江市锶达合金材料有限公司 A kind of medicine core welding material
CN108000001A (en) * 2018-01-24 2018-05-08 江苏孚尔姆焊业股份有限公司 New type stainless steel. corrosion resistance flux-cored wire
CN109822258A (en) * 2019-01-23 2019-05-31 洛阳双瑞特种合金材料有限公司 A kind of low-temperature steel LPG ship flux-cored wire used for submerged arc welding
CN112108791A (en) * 2020-08-12 2020-12-22 中国船舶重工集团公司第七二五研究所 Alkaline seamless flux-cored wire for improving low-temperature toughness of low-alloy high-strength steel welding joint

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CN1775452A (en) * 2005-11-24 2006-05-24 武汉铁锚焊接材料股份有限公司 Carbon steel cored solder wire for gas-shielded arc welding
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CN101157169A (en) * 2006-10-02 2008-04-09 株式会社神户制钢所 Filling soldering flux wire for titania gas coverage arc welding
CN101396774A (en) * 2007-09-30 2009-04-01 苏派特金属（昆山）有限公司 Flux-cored wire
CN102528332A (en) * 2010-12-20 2012-07-04 昆山京群焊材科技有限公司 High-strength low-temperature-resistant TiO2-series CO2 gas-shielded low-hydrogen type flux-cored wire

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Publication number Priority date Publication date Assignee Title
CN1775452A (en) * 2005-11-24 2006-05-24 武汉铁锚焊接材料股份有限公司 Carbon steel cored solder wire for gas-shielded arc welding
CN101157169A (en) * 2006-10-02 2008-04-09 株式会社神户制钢所 Filling soldering flux wire for titania gas coverage arc welding
CN101104232A (en) * 2007-08-09 2008-01-16 武汉铁锚焊接材料股份有限公司 Low alloy steel flux-cored welding wire for carbon dioxide gas protection welding
CN101396774A (en) * 2007-09-30 2009-04-01 苏派特金属（昆山）有限公司 Flux-cored wire
CN102528332A (en) * 2010-12-20 2012-07-04 昆山京群焊材科技有限公司 High-strength low-temperature-resistant TiO2-series CO2 gas-shielded low-hydrogen type flux-cored wire

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104439760A (en) * 2014-11-21 2015-03-25 宁波隆兴焊割科技股份有限公司 Flux-cored wire for welding low-temperature steel and preparation method thereof
CN104588904A (en) * 2014-11-21 2015-05-06 宁波隆兴焊割科技股份有限公司 High-tenacity and low-yield-ratio flux-cored wire and preparing method thereof
CN104439760B (en) * 2014-11-21 2016-08-24 宁波隆兴焊割科技股份有限公司 A kind of for flux-cored wire welding low-temperature steel and preparation method thereof
CN104588915A (en) * 2014-12-09 2015-05-06 天津大桥金属焊丝有限公司 Gas shield build-up welding flux-cored wire for hot-forging die
CN104785954A (en) * 2015-04-17 2015-07-22 上海焊接器材有限公司 High-strength and high-tenacity basic flux cored wire
CN106695171A (en) * 2017-02-09 2017-05-24 首钢总公司 Flux-cored wire for non gas shielded welding
CN107498213A (en) * 2017-10-18 2017-12-22 镇江市锶达合金材料有限公司 A kind of medicine core welding material
CN108000001A (en) * 2018-01-24 2018-05-08 江苏孚尔姆焊业股份有限公司 New type stainless steel. corrosion resistance flux-cored wire
CN109822258A (en) * 2019-01-23 2019-05-31 洛阳双瑞特种合金材料有限公司 A kind of low-temperature steel LPG ship flux-cored wire used for submerged arc welding
CN112108791A (en) * 2020-08-12 2020-12-22 中国船舶重工集团公司第七二五研究所 Alkaline seamless flux-cored wire for improving low-temperature toughness of low-alloy high-strength steel welding joint

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