CN103111771B - The low chromium iron-based abrasion resistant overlaying-welding flux-cored wire of a kind of low boron - Google Patents
The low chromium iron-based abrasion resistant overlaying-welding flux-cored wire of a kind of low boron Download PDFInfo
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- CN103111771B CN103111771B CN201310055824.4A CN201310055824A CN103111771B CN 103111771 B CN103111771 B CN 103111771B CN 201310055824 A CN201310055824 A CN 201310055824A CN 103111771 B CN103111771 B CN 103111771B
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Abstract
The low chromium iron-based abrasion resistant overlaying-welding flux-cored wire of a kind of low boron, belongs to materials processing field of welding material.Adopt carbon steel steel band parcel medicine core powder, flux-cored wire filling rate is 19 ~ 26%, and the alloying element of flux-cored wire comprises by mass percentage: C:0.6 ~ 0.95%; B:0.55 ~ 0.9%; Cr:2.5 ~ 4.9%; Nb:1.6 ~ 1.9%; Ni:1.2 ~ 1.5%; Mn:0.95 ~ 1.3%; Si:0.8 ~ 1.3%; Fe and inevitably impurity: surplus.The made alloy grain of flux-cored wire of the present invention is tiny, separates out, have rational wearability and crack resistance matching performance in tissue without thick nascent hard phase; Bead-welding technology is good, and appearance of weld is attractive in appearance, can repeated overlaying weldability use, excellent compatibility.
Description
Technical field
The invention belongs to materials processing field of welding material, be specifically related to a kind of flux-cored wire for wear-resistant belt of petroleum drill rod built-up welding.
Background technology
The wear problem of drilling rod and sleeve pipe has become one of main problem affecting oil drilling, every year because the drilling tool failure caused that weares and teares result in serious economic loss, have impact on the efficiency of oilfield exploitation greatly.Shaped wear-resistant belt of drill pipe joint has the anti-wear performance being better than joint itself, and can play the effect of antifriction to sleeve pipe, thus wear-resistant strip technology is more and more applied in drilling well simultaneously.The appearance of shaped wear-resistant belt of drill pipe joint, scraps this problem to solution drilling tool because of wear out failure and serves critical effect, extend the service life of drilling rod and sleeve pipe further.
At present, widely used wear-resistant strip flux-cored wire, mainly based on the flux-cored wire of Gao Ge, high boron iron-based alloy, by controlling chromium element and boron content, ensures to form nascent M in tissue
7c
3and eutectic Fe
2type B hard phase improves hardness and the wearability of wear-resistant strip, nascent M
7c
3and eutectic Fe
2type B hard phase all has high microhardness value, thus in raising Wear Resistance, there is important function, but, due to these two kinds, hard phase fragility is large, particle size is large, cause alloy ductility not enough, add the crackle tendency in weld deposit process, overlay cladding may be caused to occur departing from long-time wear process.In order to avoid the cracking of hardfacing alloy and coming off of causing, by reducing the content of boron, chromium element, adopt the acting in conjunction of the polynary V-N steel such as Nb, Ni, Mn, Si simultaneously, while ensureing Wear Resistance, improve the cracking resistance of wear-resistant strip hardfacing alloy further.
Summary of the invention
The object of the invention is to solve Most current resurfacing welding material wearability and cracking resistance can not the problem of Proper Match, there is provided a kind of low boron low chromium iron-based abrasion resistant overlaying-welding flux-cored wire, replace the thick nascent hard phase organization occurred in traditional wear-resistant strip tissue with the matrix of small grains and hard phase organization.
The low chromium iron-based abrasion resistant overlaying-welding flux-cored wire of low boron provided by the present invention, carbon steel steel band (preferred SPCC carbon steel steel band) is adopted to wrap up medicine core powder, flux-cored wire filling rate is 19 ~ 26%, and the alloying element of described flux-cored wire comprises by mass percentage: C:0.6 ~ 0.95%; B:0.55 ~ 0.9%; Cr:2.5 ~ 4.9%; Nb:1.6 ~ 1.9%; Ni:1.2 ~ 1.5%; Mn:0.95 ~ 1.3%; Si:0.8 ~ 1.3%; Fe and inevitably impurity: surplus.
The alloying element of preferred described flux-cored wire comprises by mass percentage: C:0.65 ~ 0.92%; B:0.6 ~ 0.85%; Cr:3.0 ~ 4.85%; Nb:1.65 ~ 1.85%; Ni:1.28 ~ 1.45%; Mn:1.0 ~ 1.25%; Si:0.85 ~ 1.2%; Fe and inevitably impurity: surplus.
The alloying element of further preferred described flux-cored wire comprises by mass percentage: C:0.7 ~ 0.9%; B:0.65 ~ 0.8%; Cr:3.5 ~ 4.8%; Nb:1.7 ~ 1.8%; Ni:1.3 ~ 1.4%; Mn:1.1 ~ 1.2%; Si:0.9 ~ 1.1%; Fe and inevitably impurity: surplus.
The preparation method of the low chromium iron-based abrasion resistant overlaying-welding flux-cored wire of the low boron of the present invention comprises the following steps:
1, strip rolling is become U-lag, then in U-lag, add the medicine core powder accounting for flux-cored wire gross weight 19-26% of the present invention;
2, U-lag is healed up, medicine core is wrapped up wherein, by wire drawing die, by road drawing, tube reducing, finally makes its diameter reach requirement, be generally preferably 1.6mm, obtain final products.
Wherein alloy element action is as follows:
B: to weld metal transition boron element, mainly in order to obtain the boron-carbide of high rigidity, thus improves the wearability of hardfacing alloy.Hardfacing alloy hardness and wearability improve along with the increase of Boron contents, but can separate out thick eutectic Fe in the too high tissue of Boron contents
2b hard phase, causes the crack resistance of hardfacing alloy not enough, therefore, in order to ensure that hardfacing alloy wearability avoids eutectic Fe simultaneously
2the generation of B phase, it is 0.55 ~ 0.9wt.% that the present invention designs B content in hardfacing alloy.
Cr: solution strengthening element, the thick carbide hard phase of high rigidity, high fragility can be formed, the present invention is in order to ensure that Cr element can suppress the precipitation of this kind of nascent hard phase while of can playing the effect of solution strengthening to matrix, and in design hardfacing alloy, Cr content is 2.5 ~ 4.9wt.%.
Nb: to weld metal transition niobium element, niobium element is that strong carbide separates out element, and the NbC phase of formation has high rigidity, high-modulus, comparatively high-flexural strength, low-friction coefficient, can the effective feature such as crystal grain thinning, is a kind of desirable hard phase under drilling rod operating mode.It is 1.6 ~ 1.9wt.% that the present invention designs Nb content in hardfacing alloy.
Ni: consider the hardenability that B element may be brought, by adding appropriate nickel powder transition Ni element, strengthens toughness and the intensity of wear-resistant strip matrix.
Mn, Si: utilize manganese silicon combined deoxidation, improve transfer coefficient of element.
Fe: fill up surplus.
Compared with current material, advantage of the present invention is:
1, flux-cored wire hardfacing alloy of the present invention has both the advantage of high-wearing feature and high cracking resistance, and combination property is better than same kind of products at abroad.
2, adopt the alloy structure crystal grain of flux-cored wire built-up welding of the present invention tiny, nascent hard phase without coarse grains is separated out, the tiny NbC hard phase formed and boron-carbide tissue diffusion be distributed on matrix, simultaneously Cr element instead of in traditional handicraft to rely in the mode of solution strengthening matrix and forms nascent M
7c
3the mode of hard phases strengthening matrix, while raising hardfacing alloy intensity and wearability, ensure that and in use there will not be hardfacing alloy to ftracture and the stripping that causes.
3, bead-welding technology is good: without the need to weld preheating, postheating, and heap postwelding wear-resistant strip does not occur crackle, and it is little to splash in welding process, and appearance of weld is attractive in appearance.
4, flux-cored wire of the present invention has high compatibility, can repeated overlaying weldability use.
Accompanying drawing explanation
Fig. 1: the low boron of the present invention low chromium iron-based abrasion resistant overlaying-welding flux-cored wire bead-on-plate weld shape appearance figure;
Fig. 2: embodiment 4 Chinese medicine core welding wire built-up welding alloy microstructure;
Fig. 3: embodiment 4 flux-cored wire hardfacing alloy XRD schemes.
Detailed description of the invention
Illustrate substantive distinguishing features of the present invention and remarkable advantage further below by embodiment, the present invention is only confined to stated embodiment by no means.
In each embodiment, same section is as described below:
1, in embodiment, flux-cored wire crust selects specification to be 12 × 0.3mm(width is 12mm, thickness is 0.3mm) SPCC carbon steel steel band, flux for flux-cored wire composition illustrates in an embodiment, selected phase answers powder to cross 60 mesh sieve respectively, selected various powder is put into mixed powder machine mixing 10 minutes, then the medicine core powder obtained is added in the steel band groove of U-shaped, U-lag is healed up, medicinal powder is wrapped up wherein.Then be: the wire drawing die of 3.0mm, 2.8mm, 2.6mm, 2.4mm, 2.2mm, 2.0mm, 1.8mm, 1.6mm, by road drawing, tube reducing, finally make its diameter reach 1.6mm respectively through diameter, obtain low boron low ferrochrome base flux-cored wire.
2, in welding wire built-up welding process, technological parameter is all set as: voltage: 26-29V; Electric current: 260-290A; Wire feed rate: 430-460mm/min; Gas flow rate: 18-23L/min; Welding wire stretches out the length of ignition tip: 14-28mm.
Embodiment 1
The flux-cored wire hardfacing alloy element of the present embodiment comprises by mass percentage: C:0.6%; B:0.55%; Cr:2.5%; Nb:1.6%; Ni:1.2%; Mn:0.95%; Si:0.8%; Fe: surplus.Add in the steel band groove of U-shaped by the metal powder prepared, alloyed powder medicine core powder after mixing, filling rate is 19%, is healed up by U-lag, obtains the low boron low ferrochrome base flux-cored wire that diameter is 1.6mm.
Embodiment 2
The flux-cored wire hardfacing alloy element of the present embodiment comprises by mass percentage: C:0.65%; B:0.6%; Cr:3.0%; Nb:1.65%; Ni:1.28%; Mn:1.0%; Si:0.85%; Fe: surplus.Add in the steel band groove of U-shaped by the metal powder prepared, alloyed powder medicine core powder after mixing, filling rate is 26%, is healed up by U-lag, obtains the low boron low ferrochrome base flux-cored wire that diameter is 1.6mm.
Embodiment 3
The flux-cored wire hardfacing alloy element of the present embodiment comprises by mass percentage: C:0.7%; B:0.65%; Cr:3.5%; Nb:1.7%; Ni:1.3%; Mn:1.1%; Si:0.9%; Fe: surplus.Add in the steel band groove of U-shaped by the metal powder prepared, alloyed powder medicine core powder after mixing, filling rate is 25%, is healed up by U-lag, obtains the low boron low ferrochrome base flux-cored wire that diameter is 1.6mm.
Embodiment 4
The flux-cored wire hardfacing alloy element of the present embodiment comprises by mass percentage: C:0.9%; B:0.8%; Cr:4.8; Nb:1.8%; Ni:1.4%; Mn:1.2%; Si:1.1%; Fe: surplus.Add in the steel band groove of U-shaped by the metal powder prepared, alloyed powder medicine core powder after mixing, filling rate is 23%, is healed up by U-lag, obtains the low boron low ferrochrome base flux-cored wire that diameter is 1.6mm.
Embodiment 5
The flux-cored wire hardfacing alloy element of the present embodiment comprises by mass percentage: C:0.92%; B:0.85%; Cr:4.85%; Nb:1.85%; Ni:1.45%; Mn:1.25%; Si:1.2%; Fe: surplus.Add in the steel band groove of U-shaped by the metal powder prepared, alloyed powder medicine core powder after mixing, filling rate is 24%, is healed up by U-lag, obtains the low boron low ferrochrome base flux-cored wire that diameter is 1.6mm.
Embodiment 6
The flux-cored wire hardfacing alloy element of the present embodiment comprises by mass percentage: C:0.95%; B:0.9%; Cr:4.9%; Nb:1.9%; Ni:1.5%; Mn:1.3%; Si:1.3%; Fe: surplus.Add in the steel band groove of U-shaped by the metal powder prepared, alloyed powder medicine core powder after mixing, filling rate is 22%, is healed up by U-lag, obtains the low boron low ferrochrome base flux-cored wire that diameter is 1.6mm.
Carry out experiment of hardness, wear-resistant experiment, crack resistance experiment to the overlay cladding deposited metal prepared by example, test result is as shown in table 1 below.
Adopt HR-150A Rockwell hardness machine to measure hardness number, load is 150kg, gets at 10 beat hardness to deposited metal, finally obtains the average Rockwell hardness number of this flux-cored wire overlay cladding.
Wearability experiment adopts the wheeled grain-abrasion testing machine of MLS-225 type damp sand rubber to carry out.Wear specimens is of a size of 57mm × 25.5mm × 6mm, and test parameters is as follows: rubber wheel rotating speed: 240r/min; Rubber wheel diameter: 178mm; Rubber wheel hardness: 60 (Shao Er hardness); Load 100N; Rubber wheel revolution: pre-grinding 1000 turns, fine grinding 4000 turns, abrasive material: granularity 40-70 order quartz sand.The weight loss of material wear-resistant performance wearing and tearing is weighed.Experiment with Q36CrNiMo4 steel as a comparison, the ratio of contrast piece weight loss and measuring piece weight loss is as the relative wear resistance of this formula.
During cracking test, not preheating before guarantee weldering, under the prerequisite that postwelding is not heat-treated, without built-up welding 3 layers continuous on the joint of petroleum drill rod of built-up welding, be soldered rear observation welding bead surface, again with the cracks on dye penetrant inspection technology display welding bead after smooth with grinder buffing.
The hardness of table 1 embodiment 1-6 deposited metal, relative wear resistance and crack resistance
Claims (1)
1. the low chromium iron-based abrasion resistant overlaying-welding flux-cored wire of low boron, is characterized in that, adopt carbon steel steel band parcel medicine core powder, flux-cored wire filling rate is 19 ~ 26%, and the alloying element of described flux-cored wire comprises by mass percentage: C:0.7 ~ 0.9%; B:0.65 ~ 0.8%; Cr:3.5 ~ 4.8%; Nb:1.7 ~ 1.8%; Ni:1.3 ~ 1.4%; Mn:1.1 ~ 1.2%; Si:0.9 ~ 1.1%; Fe and inevitably impurity: surplus;
Described flux-cored wire crust band used is SPCC carbon steel steel band.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310055824.4A CN103111771B (en) | 2013-02-21 | 2013-02-21 | The low chromium iron-based abrasion resistant overlaying-welding flux-cored wire of a kind of low boron |
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| CN201310055824.4A CN103111771B (en) | 2013-02-21 | 2013-02-21 | The low chromium iron-based abrasion resistant overlaying-welding flux-cored wire of a kind of low boron |
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| CN103111771A CN103111771A (en) | 2013-05-22 |
| CN103111771B true CN103111771B (en) | 2015-11-04 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103381527B (en) * | 2013-07-06 | 2015-07-29 | 北京工业大学 | A kind of tungsten carbide strengthens iron-based abrasion resistant overlaying-welding flux-cored wire |
| CN103949794A (en) * | 2014-04-10 | 2014-07-30 | 北京工业大学 | Iron base hardfacing flux-cored wire containing superfine carbide hard phase |
| CN105057909B (en) * | 2015-07-09 | 2017-09-26 | 苏州优霹耐磨复合材料有限公司 | Cushion open arc welding wire |
| CN112458457B (en) * | 2020-11-26 | 2022-04-26 | 上海交通大学 | Iron-based alloy powder and application thereof |
| CN113996969A (en) * | 2021-11-10 | 2022-02-01 | 海隆管道工程技术服务有限公司 | High-hardness and high-wear-resistance flux-cored wire for build-up welding of inner wall of pipeline |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS61206589A (en) * | 1985-03-11 | 1986-09-12 | Nippon Steel Corp | Submerged arc welding method for hardening and build-up |
| CN101421073A (en) * | 2006-02-16 | 2009-04-29 | 司多迪公司 | Hard-facing alloys having improved crack resistance |
| CN102581515A (en) * | 2012-03-16 | 2012-07-18 | 北京工业大学 | Iron-based overlaying flux-cored welding wire for abrasion-resistant belts of drill pipe joints |
| CN102744532A (en) * | 2011-04-19 | 2012-10-24 | 王新虎 | Iron-based abrasion resisting and reducing surfacing flux-cored wire |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100101780A1 (en) * | 2006-02-16 | 2010-04-29 | Michael Drew Ballew | Process of applying hard-facing alloys having improved crack resistance and tools manufactured therefrom |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61206589A (en) * | 1985-03-11 | 1986-09-12 | Nippon Steel Corp | Submerged arc welding method for hardening and build-up |
| CN101421073A (en) * | 2006-02-16 | 2009-04-29 | 司多迪公司 | Hard-facing alloys having improved crack resistance |
| CN102744532A (en) * | 2011-04-19 | 2012-10-24 | 王新虎 | Iron-based abrasion resisting and reducing surfacing flux-cored wire |
| CN102581515A (en) * | 2012-03-16 | 2012-07-18 | 北京工业大学 | Iron-based overlaying flux-cored welding wire for abrasion-resistant belts of drill pipe joints |
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