CN104117788B - The overcritical jessop welding rod of a kind of low hydrogen type - Google Patents
The overcritical jessop welding rod of a kind of low hydrogen type Download PDFInfo
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- CN104117788B CN104117788B CN201410382625.9A CN201410382625A CN104117788B CN 104117788 B CN104117788 B CN 104117788B CN 201410382625 A CN201410382625 A CN 201410382625A CN 104117788 B CN104117788 B CN 104117788B
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- core wire
- welding rod
- jessop
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Classifications
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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
- B23K35/02—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
-
- 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
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- 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
- B23K35/3601—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 with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
-
- 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
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The present invention is applicable to technical field of welding materials, provides a kind of low hydrogen type overcritical jessop welding rod, and the raw material that wherein said coating comprises and the mass percent of each raw material are as follows: marble 15-20%; Fluorite 30～50%; 98 ° of rutile 3～5%; Silicon powder 3～5%; 45# atomization ferrosilicon 7～10%; Marine alga 0.5～1%; Electrolytic manganese 5～10%; Graphite 0.2～0.4%; Rare earth oxide 0.3～1%; Surplus is iron powder. In the present invention, marble in electrode coating and fluorite ratio are about 1:2, the diffusible hydrogen content that has reduced weld seam, has improved processing property of electrode, in addition to core wire composition microalloying, adopt core wire Transition-metal Alloys composition, obtain good mechanical property, empirical tests, this welding rod arc good stability, impact flexibility is good simultaneously, cracking resistance is good, diffusible hydrogen reaches ultralow-hydrogen low level, welding procedure is good, is applicable to the welding of T/P91 steel full position.
Description
Technical field
The invention belongs to technical field of welding materials, relate in particular to the overcritical jessop welding rod of a kind of low hydrogen type.
Background technology
T/P91 steel is on the basis of traditional 9Cr1Mo steel, to have added the novel steel grade obtaining after a small amount of niobium, vanadium and nitrogen microalloying. Such composition provides good long term high temperature creep strength. T/P91 steel is widely used in the construction of the primary structures such as boiler-steam dome, jet chimney and the steam turbine casing in coal-fired and power station, and the while also can be applicable on the smelting equipment of petrochemical industry and lique faction of coal, equipment for gasification.
But in heat resisting steel field, supporting T/P91 steel electrode processing performance and mechanical property are undesirable, have that diffusible hydrogen is high, crack resistance is poor, impact flexibility is undesirable.
Summary of the invention
In view of the above problems, the object of the present invention is to provide the overcritical jessop welding rod of a kind of low hydrogen type, be intended to solve the processing property of electrode of existing welding T/P91 steel and the technical problem that mechanical property is undesirable, diffusible hydrogen is high, crack resistance is poor, impact flexibility is undesirable.
The overcritical jessop welding rod of described low hydrogen type comprises core wire and is wrapped in the coating on described core wire surface, and wherein, the raw material that described coating comprises and the mass percent of each raw material are as follows:
Surplus is iron powder.
Further, the element comprising in described core wire and each element mass percent are as follows:
Surplus is Fe.
The invention has the beneficial effects as follows: in the present invention, marble in electrode coating and fluorite ratio are about 1:2, reduce the diffusible hydrogen content of weld seam, improve usability of electrode energy, can all-position welding, in addition for core wire part, to core wire composition microalloying, adopt core wire Transition-metal Alloys composition, obtain good mechanical property, empirical tests, the overcritical jessop welding rod of low hydrogen type provided by the invention, there is arc stability good, impact flexibility is good simultaneously, cracking resistance is good, diffusible hydrogen reaches ultralow-hydrogen low level, welding procedure is good, be applicable to the welding of T/P91 steel full position.
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 hydrogen type overcritical jessop welding rod, comprises core wire and is wrapped in the coating on described core wire surface, and wherein, the raw material that described coating comprises and the mass percent of each raw material are as follows:
Surplus is iron powder.
In above-mentioned raw materials: marble main component is CaCO3, under high temperature, be decomposed into CaO, CO2, mainly playing slag making, gas making effect, protection molten pool metal is not oxidized, and conventional basic electrode addition is 40% left and right, and in the present embodiment, for controlling diffusible hydrogen content, addition control is 15-20%.
Fluorite main component CaF2, play slag making, improve slag fluidity, dehydrogenation effect, in the present embodiment by adding a large amount of fluorites, play and reduce diffusible hydrogen effect, match with marble, when having reduced weld seam diffusible hydrogen simultaneously, ensured that welding rod has good welding procedure, addition control is 30～50%.
Rutile main component is TiO2, playing stable arc, improve the removability of slag, the effect in calm molten bath, addition is too much, and butt welded seam mechanical property has impact, and rutile is a kind of mineral resources simultaneously, and price is more expensive, considers resource and cost, should not add too much. The present embodiment adopts 98 ° of rutile, and addition is controlled at 3～5%.
Silicon powder main component is SiO2, mainly working to improve slag fluidity, addition too much can cause de-slag difficulty, and addition control is 3～5%.
Si in 45# atomization ferrosilicon is important deoxidier, in electrode coating, contain the oxygen content that a certain amount of Si can reduce weld metal, improve low-temperature impact toughness, regulate the mobility of molten iron, addition is very few, does not have the effect of deoxidation, and addition is too much, cause weld strength higher, deoxidation surplus produces pore. Therefore addition is controlled at 7～10%.
Mn in electrolytic manganese is main deoxidier, can reduce the oxygen content of weld metal, increases weld metal intensity and crack resistance, improves low-temperature impact toughness, regulates molten iron flow, with ferrosilicon in like manner, therefore in the present embodiment, content is limited to 5～10%.
Graphite main component is C, can improve welding rod arc stability, and addition too much easily causes welding rod arc drift, and therefore addition is controlled at 0.2～0.4%.
Marine alga main rising in welding rod manufacture improved powder extrusion mobility and plasticity, and addition too much can cause the too fast exsiccation of powder, affects extrusion, and therefore addition is controlled at 0.5～1%.
Rare earth oxide is crystal grain thinning, and for removing the impurity of crystal boundary, content is controlled at 0.3～1%.
Wherein, the element comprising in described core wire and each element mass percent are as follows:
Surplus is Fe.
In above-mentioned element, Cr is improved the effect of intensity and quenching degree, can improve the ability of the corrosion-resistant and elevated temperature strength of weld seam, but reduces weld metal low-temperature impact toughness. In core wire, content is controlled at 10～13%.
Ni is alloying element important in weld metal, can improve the low-temperature flexibility of weld metal, reduce ductile-brittle transition temperature, but nickel too high levels can increase hot tearing sensitiveness. Content control≤1.0% in core wire.
Mo is one of most important alloying element improving heat resistance, generally all contains Mo in heat resisting steel, and Mo is dissolved in ferrite, can significantly improve ferritic recrystallization temperature, thereby improves creep strength. Meanwhile, can produce dispersion-strengthened action with the form of tiny carbide. In core wire, content is controlled at Mo1.0～1.4%.
Nb general control is 0.04～0.08%, and now weld metal has good high temperature creep property and desirable normal temperature performance.
By adding a small amount of V, N, Cu to carry out microalloy treatment, ensure best weld metal croop property.
Fe can improve conditions at the arc, can regulate molten iron fusing point and viscosity, remains as iron.
In the present embodiment Choice, the marble in coating and fluorite ratio are about 1:2, have reduced the diffusible hydrogen content of weld seam, have improved usability of electrode energy, can all-position welding; In addition, to core wire composition microalloying, can obtain good mechanical property. In actual production manufacture process, coating and core wire inevitably can be introduced a small amount of impurity, and as S, P etc., the impurity elements such as S, P can increase the crackle of weld seam, reduce weld seam low-temperature impact toughness, must carry out strict control. In core wire and coating, the impurity element such as S, P, in the situation that meeting material standard, controls to minimum as far as possible. The present embodiment is strictly controlled S, P and other impurity contents in raw material, is no more than 0.005%, can reduce like this bead crack. By adopting the mode of Mn – Si combined deoxidation, reduce the oxygen content in weld seam as far as possible, adopt this slag system, weld metal stable mechanical property, crack resistance are good, take corresponding measure in production process, further control diffusible hydrogen content.
In the embodiment of the present invention, covering of an electrode, core wire composition can be chosen arbitrarily in above-mentioned limited range, enumerate an instantiation below, and verify and manufacture the usability of electrode energy obtaining.
Embodiment mono-:
Electrode coating, core wire composition and quality proportioning are as follows:
Compositions of surfacing metal and proportioning: marble 20%; Fluorite 40%; 98 ° of rutile 5%; Silicon powder 5%; 45# atomization ferrosilicon 10%; Marine alga 1%; Electrolytic manganese 10%; Graphite 0.4%; ReO0.5%; Surplus is iron powder.
Core wire composition and proportioning: C0.05%; Si0.2%; Mn0.7%; Cr12%; Ni0.05%; Mo1.4%; V0.4%; Nb0.04%; N0.07%; Cu0.05%; Al0.02%; Surplus is iron.
Carry out soldering test to adopting said ratio to make welding rod, result is as follows:
1, diffusible hydrogen content test:
Adopt ISO3690 standard to carry out diffusible hydrogen content mensuration, testing equipment welds for Kazakhstan the mercury process diffusible hydrogen measuring instrument of developing, and model is: MF-1. Testing measured data is respectively: 3.2,3.1,2.9 (unit is: ml/100g), reach ultralow-hydrogen low (≤5ml/100g) standard.
2, welding procedure test
Observe through welding, arc stability, splashes little, and smog is less, appearance of weld light, and welding procedure is good.
3, mechanical property test
Downhand position welding, weld preheating to 280 DEG C, carries out 760 ± 15 DEG C of insulations two hours to workpiece after welding in accordance with regulations, and the deposited metal mechanical property of embodiment and banjo fixing butt jointing mechanical property are respectively in table 1 and table 2:
Table 1 deposited metal mechanical property
| Rm (Mpa of unit) | AKV at 20 DEG C2Ballistic work/J |
| 620 | 90、95、98 |
Table 2 banjo fixing butt jointing mechanical property
4, oblique Y cracking test
Enter The test of the oblique Y cold-crack resistance of row, weld preheating to 280 DEG C, result of the test is as following table 3:
| Experimental condition | (10℃×72％RH) | (0℃×80％RH) | (20℃×54％RH) |
| Crackle rate | 0 | 0 | 0 |
Table 3 is Y cracking test result tiltedly
After testing, face crack rate, section crack rate, root crack rate are 0%, and performance is outstanding.
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 (5)
1. the overcritical jessop welding rod of low hydrogen type, comprises core wire and is wrapped in the coating on described core wire surface, it is characterized in that, the raw material that described coating comprises and the mass percent of each raw material are as follows:
Marble 15-20%;
Fluorite 30 ~ 50%;
98 ° of rutile 3 ~ 5%;
Silicon powder 3 ~ 5%;
45# atomization ferrosilicon 7 ~ 10%;
Marine alga 0.5 ~ 1%;
Electrolytic manganese 5 ~ 10%;
Graphite 0.2 ~ 0.4%;
Rare earth oxide 0.3 ~ 1%;
Surplus is iron powder;
The mass ratio of wherein said marble and fluorite is 1:2.
2. the overcritical jessop welding rod of low hydrogen type as claimed in claim 1, is characterized in that, the raw material that described coating comprises and the mass percent of each raw material are as follows:
Marble 20%;
Fluorite 40%;
98 ° of rutile 5%;
Silicon powder 5%;
45# atomization ferrosilicon 10%;
Marine alga 1%;
Electrolytic manganese 10%;
Graphite 0.4%;
Rare earth oxide 0.5%;
Surplus is iron powder.
3. the overcritical jessop welding rod of low hydrogen type as claimed in claim 1 or 2, is characterized in that, the element comprising in described core wire and each element mass percent are as follows:
C≤0.07%；
Si≤0.2%；
Mn0.4~0.7%；
Cr10~13%；
Ni≤1.0%；
Mo1.0~1.4%；
V0.25~0.45%；
Nb0.04~0.08%；
N0.04~0.08%；
Cu≤0.10%；
Al≤0.02%；
Surplus is Fe.
4. the overcritical jessop welding rod of low hydrogen type as claimed in claim 3, is characterized in that, the element comprising in described core wire and each element mass percent are as follows:
C0.05%；
Si0.2%；
Mn0.7%；
Cr12%；
Ni0.05%；
Mo1.4%；
V0.4%；
Nb0.04%；
N0.07%；
Cu0.05%；
Al0.02%；
Surplus is Fe.
5. the overcritical jessop welding rod of low hydrogen type as claimed in claim 4, is characterized in that, in described coating and core wire composition, S, P impurity content are all no more than 0.005%.
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| CN105290645B (en) * | 2015-10-30 | 2018-03-16 | 武汉铁锚焊接材料股份有限公司 | A kind of welding rod for high-strength steel welding and its preparation method and application |
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| CN106078004B (en) * | 2016-06-23 | 2018-10-02 | 武汉铁锚焊接材料股份有限公司 | A kind of low temperature spherical tank ultralow-hydrogen low high-tenacity welding electrodes |
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