CN105414796B - A kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding - Google Patents
A kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding Download PDFInfo
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- CN105414796B CN105414796B CN201510921282.3A CN201510921282A CN105414796B CN 105414796 B CN105414796 B CN 105414796B CN 201510921282 A CN201510921282 A CN 201510921282A CN 105414796 B CN105414796 B CN 105414796B
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- 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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/10—Pipe-lines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
A kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding, belong to field of welding material.The self-protection flux-cored wire is by steel band and medicine core powder constituent, it is characterised in that the deposited metal composition and weight/mass percentage composition of the welding wire be：C：0.01~0.08wt%, Si：0~0.5wt%, Mn：0.5~2.0wt%, P：≤ 0.02wt%, S：≤ 0.01wt%, Al：0.5~1.5wt%, Ni：3.0~4.5wt%, surplus are Fe and inevitable impurity；Also V：0~0.08wt%, Co：0~0.5wt%, Zr：0~0.06wt%, Rare-Earth Ce：One or more in 0~0.02wt% alloying elements.Advantage is; flux-cored wire will not generate volume of smoke and pernicious gas in welding process; nitrogen, oxygen content are relatively low in molten bath; free nitrogen content in weld metal can be reduced to below 150ppm; weld seam solidification state is organized as the ferrite bainite tissue and granular bainite microstructure of refinement; the refinement of MA constituent elements, Dispersed precipitate, are effectively improved shelf-shielded arc weld impact flexibility.
Description
Technical field
The invention belongs to field of welding material, and in particular to a kind of high-ductility self-shield medicine suitable for high-grade pipe welding
Core welding wire, all positon self-shield flux-cored wire used for welding of the high-grade pipe that is particularly suitable for use in (X80, X90, X100).
Background technology
Self-protection flux-cored wire since the advent of the world have passed through the development of nearly 50 years, from initial to pursue processing performance
Based on develop into current high-strength, high-ductility and the high-quality self-protection flux-cored wire that all-position welding can be carried out.As one kind
Efficiently, convenient, economic novel welding material, self-protection flux-cored wire have obtained extensively in fields such as oil-gas pipeline, ocean platforms
General application, there is vast potential for future development.Self-protection flux-cored wire is in addition to the characteristics of flux-cored wire, also with following excellent
Point：1. being not required to additional protection source of the gas, existing gas shielded welding equipment modification can be used, reduces renewal of the equipment cost and more
It is easy to operation；2. there is excellent wind loading rating, generally can the smooth welding under fresh breeze；3. excellent rust-proofing ability.Self-shield
Welding material of the flux-cored wire as a kind of efficient and suitable outdoor work, led in welding such as petroleum pipeline, ship, drilling platforms
Domain enjoys favor, especially in China's Pipeline the girth welding of pipe line steel some use self-shield
Flux-cored wire semiautomatic welding is completed.
But because self-protection flux-cored wire is a kind of welding material under the protection of no adscititious gases, cause weld seam
Oxygen in Metals, nitrogen equal size are higher, often cause the toughness of line pipe welding point larger fluctuation often occur.The one of the present invention
Ni contents greatly improved compared to conventional welding wire in kind high-toughness self-protection flux-cored welding wire and seam organization, and optimize other conjunctions
Gold dollar cellulose content, free nitrogen content effectively reduces in weld seam, and it is few that what microscopic structure obtained is that a kind of ferrite bainite of refinement adds
The line and staff control of granular bainite is measured, MA particles effectively improve weldquality, improved in refinement, Dispersed precipitate in the tissue
Weld metal toughness, it can especially meet the field work demand of outdoor Large Diameter Pipeline pipe line steel.
The content of the invention
It is an object of the invention to provide a kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding, the welding wire
Welding technological properties and excellent in mechanical performance, the welding requirements of high-strength and high ductility pipe line steel can be met.
A kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding of the present invention, including mild steel
The welding wire crust and medicine core of band, the deposited metal composition and weight/mass percentage composition of the welding wire are:C：0.01~0.08wt%,
Si：0~0.5wt%, Mn：0.5~2.0wt%, P：≤ 0.02wt%, S：≤ 0.01wt%, Al:0.5~1.5wt%, Ni：
3.0~4.5wt%, remaining is Fe and inevitable impurity.Further accordance with specific performance requirement, the also V of suitably small amount：0~
0.08wt%, Co：0~0.5wt%, Zr：0~0.06wt%, Rare-Earth Ce：One kind in the alloying elements such as 0~0.02wt% or
It is several.
Free nitrogen content in the welding wire weld metal is reduced to below 150ppm, and weld seam solidification state is organized as the plate of refinement
Bar bainite structure and a small amount of granular bainite line and staff control, the refinement of MA constituent elements, Dispersed precipitate, can be effectively improved shelf-shielded arc weld
Impact flexibility.
A kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding of the present invention, is set by the alloy of optimization
Meter, it can make the nitrogen in weld seam is most of to exist in the form of being dissolved nitrogen, dramatically reduce the presence of free nitrogen in weld seam,
Reduce the local cluster of nitrogen, reduce harm of the nitrogen to toughness.
A kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding of the present invention, is closed by adjusting in welding wire
Gold dollar cellulose content, the solidified structure for making weld seam is the ferrite bainite tissue of refinement, and heat affecting coarse grain zone is organized as lath shellfish
The line and staff control of family name's body and a small amount of granular bainite, and in refinement, Dispersed precipitate, there is MA constituent elements in whole Microstructure of Weld Metal
Effect reduces destruction of the brittlement phase MA islands to toughness.
A kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding of the present invention, it is several in its deposited metal
The effect of key component is as follows：
Al is the deoxidier and nitrogen fixation agent commonly used in self-protection flux-cored wire, has effective deoxidation, nitrogen fixation.Can be with
The generation of stomata in weld seam is effectively prevented, is played a very good protection.Aluminium is strong nitrogen fixation agent again, and aluminium can be acted on nitrogen and generated
Stable nitride and the steel insoluble in liquid, are combined into N2 bubbles, Du so as to effectively prevent oversaturated N in deposited metal
Deposited metal produces stomata absolutely.
Mn is austenitizing stable element, can reduce temperature of the austenite to ferritic transformation.With the increasing of Mn contents
Add, the quantity increase of acicular ferrite, the quantity of pro-eutectoid ferrite and ferrite side plate is reduced, and makes acicular ferrite
Grain size become more tiny, while Mn improves weld metal toughness, can also improve the intensity of weld metal.In welding wire
Mn can also play a part of deoxidation, and stable MnS can be generated with reaction of Salmon-Saxl, so as to reduce low melting point phase FeS generation,
Be advantageous to improve the heat resistanceheat resistant crackle of weld metal and the ability of lamellar tearing.
Ni is austenite stabilizer element, and Ni is infinitely solid-solution in γ-Fe, solution strengthening effect is also played in weld metal,
Austenite quenching degree can be improved, reduces phase transition temperature, promotes ferrite bainite to be formed, optimizes form and the distribution of MA constituent elements.Drop
The destruction of the toughness of low brittle hardening phase MA constituent elements.So as to be effectively improved the impact flexibility of weld seam.
Zr is typical disperse phase element, suppresses metal recrystallization and crystal grain is grown up, so as to grain refining intensificatiom alloy property.
Zr is solid-solution in matrix, or Al3Zr is generated after Zr is added, the tiny particle dispersion of ZrN, ZrC, is formed strip and is distributed in iron element
On body dendrite, with matrix coherence pinning dislocation, dendrite and crystal boundary migration are hindered, generates the dendrite and fine grain of refinement.
Rare earth element ce can improve weld seam degree of purity, change the distribution shape of field trash in weld seam (predominantly oxide)
State, so as to improve the intensity of weld seam and impact flexibility.
The high Ni self-protection flux-cored wires suitable for high-grade pipe welding of the present invention will not generate welding process
Volume of smoke and pernicious gas, improve weldquality, effectively improve weld seam impact toughness.Outdoor Large Diameter Pipeline pipeline can especially be met
The field work demand of steel.
The invention has the advantages that flux-cored wire will not generate volume of smoke and pernicious gas in welding process, in molten bath
Nitrogen, oxygen content are relatively low, and the free nitrogen content in weld metal can be reduced to below 150ppm, and weld seam solidification state is organized as refinement
Ferrite bainite tissue and granular bainite microstructure, the refinement of MA constituent elements, Dispersed precipitate；The welding wire is applicable to high-grade pipe
All-position welding, shelf-shielded arc weld impact flexibility is effectively improved, can especially meet the field work need of outdoor Large Diameter Pipeline pipe line steel
Ask.
Brief description of the drawings
Fig. 1 is that weld seam once solidifies micro-organization chart.
Fig. 2 is weld seam heat affecting coarse grain zone micro-organization chart.
Fig. 3 is the implementation case deposited metal columnar zone organization chart.
Fig. 4 is the implementation case deposited metal coarse grain zone microstructure figure.
Fig. 5 is the implementation case deposited metal fine grained region organization chart.
Fig. 6 is contrast welding wire deposited metal columnar zone organization chart.
Fig. 7 is contrast welding wire deposited metal coarse grain zone microstructure figure.
Fig. 8 is contrast welding wire deposited metal fine grained region organization chart.
Embodiment
Specific embodiment is set forth below, and the present invention will be described, it is necessary to it is pointed out here that be implementation steps in detail below
It is served only for that the invention will be further described, does not represent limiting the scope of the invention, other people make according to the present invention
Some it is nonessential modification and adjustment still fall within protection scope of the present invention.
Here is the specific embodiment of the present invention：
Embodiment:
A kind of high-ductility self-protection flux-cored wire and seam organization suitable for high-grade pipe welding, it uses common commercially available
Cold-rolled low carbon steel steel steel band be raw material, according to the difference of specific welding pipe line steel, prepare medicine according to certain ratio respectively
Core powder, after 120~300 DEG C of drying and processings, it is outer that well mixed and according to 21~24% filling rates, which are added to using cold-rolled strip,
In the welding wire of skin.6 batches of welding wires are prepared for altogether, and gage of wire is 2.0mm.
Table 1 is low-carbon cold rolling steel band chemical component table used in welding wire preparation process of the present invention, and table 2 is applicable for the present invention's
In the chemical component table of the high-ductility Deposited Metal of Self-shielded Flux of high-grade pipe welding, table 3 is institute of the embodiment of the present invention
With flux-cored wire welding mother metal and welding procedure table, Fig. 3 and Fig. 4 are respectively each region of deposited metal after welding of the embodiment of the present invention
Typical microscopic structure and the microscopic structure for contrasting welding wire weld seam, table 4 are using the deposited metal after welding of the embodiment of the present invention
Performance.
The cold-rolled strip chemical composition (weight %) of 1 welding wire of the present invention of table
| Composition | C | Si | Mn | S | P |
| 0.035 | 0.01 | 0.25 | 0.004 | 0.009 |
The high-ductility Deposited Metal of Self-shielded Flux chemical component table suitable for pipeline welding of the present invention of table 2, surplus
For Fe (weight %)
Flux-cored wire welding mother metal and welding procedure table used in the embodiment of the present invention of table 3
Table 4 is compared with the prior art the performance comparison table of deposited metal after a welding using the present invention
As can be seen here, contrast with conventional self-protection flux-cored wire, by improving the Ni contents in deposited metal, on the one hand make
Microstructure of Weld Metal refines, and microscopic structure middle plate strip bainite ratio is substantially increased, especially MA constituent elements quantity
Obvious compared with contrasting welding wire to reduce, the refinement of MA islands, Dispersed precipitate are in matrix；Simultaneously because Ni contents are improved, in weld seam
Free nitrogen content is significantly reduced, and significantly improves the impact flexibility of weld metal, and not only average value improves more than 20J, impact
Ductility values stability is also obviously improved.In addition, in welding process, the viscosity and coagulating property of slag are good, can all positon
Welding, it is especially suitable for vertical downward weldering.Welding usability is good, and arc stability, penetration power are strong, and operation is easy, and appearance of weld is attractive in appearance.It is de-
Slag is good, splashes small.
In summary, the high-ductility welded by self-shielded flux cord wire work suitable for high-grade pipe all-position welding of the invention
Skill is functional, the refinement of weld seam MA constituent elements, disperse, effectively reduce free nitrogen content in weld seam you, impact flexibility effectively changes
It is kind, it can especially meet the field work demand of outdoor Large Diameter Pipeline pipe line steel.
Claims (1)
1. a kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding, the self-protection flux-cored wire is by steel band and medicine
Core powder constituent, it is characterised in that the deposited metal composition and weight/mass percentage composition of the welding wire be：C：0.01~
0.08wt%, Si：0.11~0.18wt%, Mn：1.47~2.0wt%, P：≤ 0.02wt%, S：≤ 0.01wt%, Al：0.72
~1.02wt%, Ni：3.0~4.5wt%, surplus are Fe and inevitable impurity；Also V：0~0.08wt%, Co：0~
0.5wt%, Zr：0~0.06wt%, Rare-Earth Ce：One or more in 0~0.02wt% alloying elements；
Free nitrogen content in the welding wire weld metal is reduced to below 150ppm, and weld seam solidification state is organized as the lath shellfish of refinement
Family name's body tissue and a small amount of granular bainite line and staff control, the refinement of MA constituent elements, Dispersed precipitate, it is tough to be effectively improved shelf-shielded arc weld impact
Property.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510921282.3A CN105414796B (en) | 2015-12-11 | 2015-12-11 | A kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510921282.3A CN105414796B (en) | 2015-12-11 | 2015-12-11 | A kind of high-ductility self-protection flux-cored wire suitable for high-grade pipe welding |
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| Publication Number | Publication Date |
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| CN105414796A CN105414796A (en) | 2016-03-23 |
| CN105414796B true CN105414796B (en) | 2017-11-28 |
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| CN108544137A (en) * | 2018-06-05 | 2018-09-18 | 沈阳航空航天大学 | A kind of low hydrogen, high toughness self-protection flux-cored wire and preparation method thereof |
| CN110773905B (en) * | 2019-10-17 | 2021-01-08 | 北京奥邦新材料有限公司 | Steel welding flux-cored wire for high heat input welding, preparation method and welding method thereof |
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| JPS4942540A (en) * | 1972-08-30 | 1974-04-22 | ||
| JP3241342B2 (en) * | 1999-04-22 | 2001-12-25 | 株式会社神戸製鋼所 | MIG welding wire for high tensile steel |
| CN101733514B (en) * | 2010-02-05 | 2012-01-11 | 西南交通大学 | Rail on-line repairing technology of self-shielded flux-cored welding wire at low preheating temperature |
| CN103586594B (en) * | 2013-10-31 | 2016-06-08 | 天津大学 | The gas shielded metal core welding wire for high-strength steel welding based on ULCB tissue |
| CN104942475B (en) * | 2015-07-10 | 2017-06-16 | 北京工业大学 | A kind of X90/X100 pipe line steels high intensity metallic core welding wire for submerged-arc welding and preparation method thereof |
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