CN101244496A - Chromium-molybdenum-seel flux welding wire for gas shielded arc welding - Google Patents
Chromium-molybdenum-seel flux welding wire for gas shielded arc welding Download PDFInfo
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Abstract
The invention discloses a Cr-Mo steel flux-cored wire applying to gas shielded welding. The content proportion of the core wire accounting for the weight of the welding wire is as following: TiO2: 4 to 6%, Si: 0.2 to 0.5%, Mn: 1 to 2.2%, SiO2: 0.1 to 1%, ZrO2: 0.1 to 0.5%, Cr: 2 to 2.8%, Mo: 0.9 to 1.5%, Ni: 0 to 5%, B: 0.002 to 0.01%, Ti: 0.02 to 0.3%, Fe: 2 to 6%, Al+Mg: 0.4 to 0.75%, K, Na and Li: 0.1 to 0.35 which is converted from K, Na and Li alkali oxide and/or fluoride, wherein k: 0.02 to 0.07%, Na/Li/ Na+Li: 0.08 to 0.3%, F: 0.1 to 0.35% converted from fluoride. The proportion of S, P, Sn and Bi is less than 0.035% in the carbon steel and the core wire powders. The welding wire has the advantages that: the intensity and heat-resistant of the weld joint can be insured, at same time, the invention still has good low-temperature impact toughness and global welding performance; the stability of the electric arc and the welding operation processing property are both good; the weld joint is smooth; the weld joint metal is of good low-temperature impact toughness and crack resistance; the invention is suitable for welding heat-resistant steel such as the 2.25-Cr-1-Mo steel.
Description
Technical field
The present invention relates to the welding material that metal solder is used, be meant a kind of chromium-molybdenum-seel flux welding wire for gas shielded arc welding particularly.Be suitable for adopting the Ar+CO2 mist to weld heat resisting steel as types such as 2.25 chromium, 1 molybdenum steels.
Background technology
The advantage of the welding of gas shielded arc welding flux-cored wire is compatible stick electrode and shield-arc welding solid core welding wire welding, its production efficiency height, welding technological properties is good.Be widely used in carbon steel, the welding of low-alloy steel and high-alloy steel, but at heat resisting steel, when particularly 2.25Cr1Mo heat resisting steel welded, the defective that the low-temperature impact toughness that titania-type flux-cored welding wire commonly used also exists is low, crack resistance also needed to improve.
Chinese patent publication number: CN 101041214A, open day: on 09 26th, 2007, denomination of invention is " the heat resisting steel alkaline flux-cored wire that the removability of slag is good ", proposed to improve the technical scheme of the alkaline heat-resistant steel flux-cored wire removability of slag, improved the processing performance of welding wire effectively, but usually, the welding technological properties of alkaline welding wire will be lower than acid welding wire, so the all-position welding performance of this technical scheme still remains to be improved.
Chinese patent publication number: CN 1358605A, open day: on 07 17th, 2002, the application for a patent for invention of denomination of invention for " chromium-molybdenum-seel flux welding wire " disclosed, this welding wire is the basic slag system welding wire, low-temperature impact toughness and manufacturability for 1Cr0.5Mo chrome-molybdenum steel welding are better, but can't satisfy the requirement of heat resisting steel high strength grade such as 2.25 chromium, 1 molybdenum and heat resisting temperature.
Summary of the invention
The objective of the invention is to overcome defective and the deficiency that prior art can't satisfy high-grade heat resisting steel weld seam manufacturability and all-position welding performance requirement, a kind of chromium-molybdenum-seel flux welding wire for gas shielded arc welding is provided.Its arc stability is good,
Low temperature ImpactGood toughness, that crack resistance is good, weld seam smoothly reaches the composite technology performance is good, is particularly suitable for the gas shield all-position welding of 2.25 chromium, 1 molybdenum steel.
Technical solution of the present invention is: a kind of chromium-molybdenum-seel flux welding wire for gas shielded arc welding, comprise carbon steel crust and medicine core, and forming quality % is mild steel crust 78-86, it is as follows that medicine core 14-22, the composition of described medicine core and content account for welding wire gross mass %: TiO
24-6, Si 0.2-0.5, Mn 1-2.2, SiO
20.1-1, ZrO
20.1-0.5, Cr 2-2.8, Mo 0.9-1.5, Ni 0-5, B 0.002-0.01, Ti 0.02-0.3, Fe 2-6, Al+Mg 0.4-0.75, K, Na, Li alkali metal oxide and/or fluoride are amounted to the content 0.1-0.35 of K, Na, Li, K 0.02-0.07 wherein, and Na or Li or both sums are 0.08-0.3, fluoride is amounted to F 0.1-0.35, and S, P, Sn, Bi sum are not more than 0.035 in described carbon steel crust and the medicine core powder.
The fluoride and/or the oxide that contain rare earth metal in the medicine core of the present invention, its content are amounted to rare earth metal, and to account for welding wire gross mass % be 0.005-0.2.
Oxide TiO in the medicine core of the present invention
2+ SiO
2+ ZrO
2The content sum to account for welding wire gross mass % be 5-7.
The present invention can also add CaCO3 and/or CaF2 in the medicine core, it is 0.2-0.4 that the content of wherein amounting to CaO accounts for welding wire gross mass %, and the fluoride in the described welding wire is amounted to F 0.1-0.35.
To account for welding wire gross mass % be 0.06-0.15 to the content of C in medicine core of the present invention and the carbon steel crust.
Press quality %S 0-0.015, P 0-0.020, Sn 0-0.001, Bi0-0.001 in carbon steel crust of the present invention and the medicine core powder.
The used protective gas of welding wire of the present invention is the Ar+CO2 mist, and wherein Ar is 80%, and CO2 is 20%.
The invention has the beneficial effects as follows: 1, define the addition of CaCO3 and/or CaF2 clearly, studied and improved molten slag basicity and guarantee the method that the welding operation performance is satisfactory to both parties, when improving molten slag basicity, keep the good characteristics of titanium type slag system processing performance as far as possible, studied and added B simultaneously, Ti, C, Si, Mn is to improving the effect of impact flexibility.Weld seam
Low-temperature impactToughness has good low temperature impact flexibility and all-position welding performance again greater than 47J when guaranteeing weld seam high strength, high-fire resistance.2, the oxide or the fluoride of adding rare earth metal improve its fixedly effect of hydrogen, nitrogen, have improved the low-temperature impact toughness of weld seam effectively.3, add strong deoxidier Al, Mg, improved the low-temperature impact toughness of weld seam, help the discharge and the appearance of weld of weld seam gas.4, control oxide TiO
2+ SiO
2+ ZrO
2Addition, guaranteed the processing performance of flux-cored wire all-position welding.5, the content of strict control S, P, Sn, Bi, the crackle that has reduced weld seam is inclined to.6, the employed protective gas of welding wire is the Ar+CO2 mist, and ratio is Ar 80%, and CO2 20%, can reduce the oxidation and the scaling loss of medicine core composition, improves the stability of its weldquality.7, control the content of C in the welding wire on the whole, guaranteed the mechanical property of weld metal; Keep good arc stability and welding operation performance, its weld seam is level and smooth, and weld metal has good low-temperature impact toughness and good crack resistance, is suitable for welding the heat resisting steel as types such as 2.25 chromium, 1 molybdenum steels.
The specific embodiment
The present invention is described in further detail below in conjunction with the specific embodiment:
A kind of chromium-molybdenum-seel flux welding wire for gas shielded arc welding comprises carbon steel crust and medicine core, and forming quality % is mild steel crust 78-86, and it is as follows that medicine core 14-22, the composition of described medicine core and content account for welding wire gross mass %: TiO
24-6, Si 0.2-0.5, Mn 1-2.2, SiO
20.1-1, ZrO
20.1-0.5, Cr 2-2.8, Mo 0.9-1.5, Ni 0-5, B 0.002-0.01, Ti0.02-0.3, Fe 2-6, Al+Mg 0.4-0.75, K, Na, Li alkali metal oxide and/or fluoride are amounted to the content 0.1-0.35 of K, Na, Li, K 0.02-0.07 wherein, and Na or Li or both sums are 0.08-0.3, fluoride is amounted to F0.1-0.35, and S, P, Sn, Bi sum are not more than 0.035 in described carbon steel crust and the medicine core powder.
The steel crust of flux-cored wire of the present invention adopts mild steel, and its chemical composition sees Table 1.
Table 1: the chemical composition % of flux-cored wire steel crust
| C | Si | Mn | S | P |
| 0.03 | 0.01 | 0.28 | 0.009 | 0.012 |
The chemical analysis of medicine core powder and raw material formation see Table 2.
Table 2: the formation of medicine core powder
| Drug core component | Constitute | Account for welding wire gross mass % |
| TiO 2 | The rutile ferrotianium | 4-6 |
| Si | The ferrosilicon silicomangan | 0.2-0.5 |
| Mn | Ferromanganese silicomangan manganese metal | 1-2.2 |
| SiO 2 | Quartzy potassium, albite zircon sand zircon | 0.1-1 |
| ZrO 2 | The zircon sand zircon | 0.1-0.5 |
| CaO | Marble, fluorite | 0.2-0.4 |
| Fe | Iron powder silicomangan ferromanganese ferro-aluminum | 2-6 |
| Al+Mg | Ferro-aluminum almag magnesium powder feldspar magnesia | 0.4-0.75 |
| Alkali metal oxide | K (potassic feldspar, potassium) | 0.02-0.07 |
| Alkali metal oxide | Na or Li or both and (albite soda ash sodium silicate) | 0.06-0.35 |
| Alkali metal fluoride | NaF KF LiF | F：0.1-0.36 |
| Rare earth metal | The fluoride of rare earth metal or oxide | 0.005-0.2 |
| C | C in the steel crust, the iron powder ferrosilicon | 0.06-0.15 |
| B | The B2O3 ferro-boron | 0.002-0.01 |
| Ni | The Ni powder | 0-5 |
| Cr | The little carbon Cr of Metal Cr iron | 2-2.8 |
| Mo | Mo iron | 0.8-1.5 |
Medicine core chemical composition mentality of designing of the present invention is as follows:
TiO
2Be main slag former, arc stabilizer improves the moulding of weld seam and takes off slag, is the all-position welding indispensable material.Titanium in the ferrotianium is amounted to TiO
2Addition is less than at 4% o'clock can not embody above-mentioned characteristic, greater than 6.% o'clock because the oxygen content height, low-temperature impact toughness reduces, the slag blanket thickening influences gas and overflows from the molten bath, easily produces pore.Therefore be limited to 4-6.
C comprises C in the steel crust and the C in the medicine core, splashes and flue dust from reduction, and C is low more good more, wish below 0.02%, but collateral security weld metal mechanical property and molten iron flowability content at 0.06%-0.15% for well.Too high greater than 0.15% o'clock weld metal intensity, low-temperature impact toughness reduces, the flue dust and the increase of splashing.Crack sensitivity increases.
Si is main deoxidier, reduces the oxygen content of weld metal, improves low-temperature impact toughness, regulates the flowability of molten iron, and addition is less than at 0.2% o'clock can not embody above-mentioned characteristic, becomes sticky greater than 0.5% o'clock molten iron, and weld strength is too high, and low-temperature impact toughness reduces.Therefore be limited to 0.2%-0.5%.
Mn is main deoxidier, reduces the oxygen content of weld metal, increases weld metal intensity and crack resistance, improve low-temperature impact toughness, regulate the flowability of molten iron, addition is less than at 1.% o'clock and embodies above-mentioned characteristic deficiency, too high greater than 2.2% o'clock weld strength, low-temperature impact toughness reduces.Therefore be limited to 1-2.2%.
SiO
2Be slag former, rise and regulate slag fusing point and viscosity that improve appearance of weld, favourable weld seam is to the mother metal rounding off.Addition is less than 0.1 can not embody above-mentioned characteristic, greater than 1% o'clock because the oxygen content height, low-temperature impact toughness reduces, and causes the welding slag sintering on the weld seam easily, therefore is limited to 0.1-1%.
CaCO3 and the CaF2 molten slag basicity that is improved, improve the effect of impact flexibility, the effect of strong raising slag flowability is arranged, amounting to the CaO addition among CaCO3 and/or the CaF2, to be less than at 0.2 o'clock inoperative to improving impact flexibility, and addition makes the molten slag can not intact covering weld seam greater than 0.4 o'clock strong molten slag flowability that improves.Vertical position welding molten iron and welding slag tenesmus can not be carried out vertical position welding.Therefore be limited to 0.2%-0.4%.
ZrO
2Can improve the good covering weld seam of the fusing point of slag effectively, prevent the tenesmus of vertical position welding molten iron, reduce sinter thickness, help the eliminating of weld seam gas.Addition is less than at 0.1% o'clock can not embody above-mentioned characteristic, too high greater than 0.5% o'clock weld metal intensity, and low-temperature impact toughness reduces.Therefore be limited to 0.1%-0.5%.
Al, Mg are strong deoxidiers, (oxide that wherein contains aluminium and magnesium is amounted to into Al and Mg calculating) improves low-temperature impact toughness, both additions are less than at 0.40% o'clock and improve the low-temperature impact toughness deficiency, because deoxidation products contains aluminium and magnesium oxide the fusing point rising setting rate of slag was accelerated greater than 0.75% o'clock, the eliminating and the appearance of weld that are unfavorable for weld seam gas, welding bead protrudes during vertical position welding, easily produces air drain.Therefore be limited to 0.4%-0.75%.
Fe is an iron powder, can improve conditions at the arc, regulates molten iron fusing point and viscosity.Addition is less than at 2% o'clock and embodies above-mentioned characteristic deficiency, and greater than 6% o'clock vertical position welding degradation, it is big that flue dust becomes.Therefore be limited to 2%-6%.
Na
2O, K
2O, Li
2O is an arc stabilizer, amounts to wherein K, Na or the content of Li or both sums 0.1%-0.35% that accounts for the welding wire gross mass.Addition is less than 0.1% o'clock arc stability deficiency, and electric arc is too concentrated, and vertical position welding molten bath molten iron turns up, the electric arc instability.Addition is elongated greater than 0.35% o'clock electric arc, the flue dust and the increase of splashing, the tenesmus of vertical position welding molten iron.Amount to the 0.02%-0.07% that wherein K content accounts for the welding wire gross weight.K content is in 0.02% instability of electric arc when following, and vertical position welding molten bath molten iron turns up, and K content is 0.07% when above, and the weld seam low-temperature impact toughness reduces.
Fluoride NaF, KF, LiF are arc stabilizers, and the 0.1%-0.35% that F content accounts for the welding wire gross mass is amounted in the dehydrogenation agent.Addition is less than 0.1% o'clock arc stability deficiency, and the dehydrogenation scarce capacity easily produces the weld porosity load mould.Addition is greater than the 0.35% o'clock flue dust and the increase of splashing.When with fluoride NaF, KF, LiF as arc stabilizer, during the dehydrogenation agent, must guarantee that the content of Na in the welding wire, K or Li or both sums accounts for the 0.1%-0.35% of welding wire gross mass.
Oxide TiO
2+ SiO
2+ ZrO
2=5%-7%, oxide TiO
2+ SiO
2+ ZrO
2Bad less than 5% o'clock all-position welding technology.Oxide TiO
2+ SiO
2+ ZrO
2Too high greater than 7.% o'clock oxygen content, low-temperature impact toughness reduces, and easily produces the weld porosity load mould.
The fluoride of rare earth metal or oxide have fixedly hydrogen, nitrogen, improve the effect of low-temperature impact toughness, amount to the 0.005%-0.2% that rare earth metal content accounts for the welding wire gross mass.Less than 0.005% o'clock very little to the effect of fixedly hydrogen, nitrogen, caused the electric arc shakiness to splash to increase, influence appearance of weld to the dilution of slag is excessive greater than 0.2% o'clock.
Ni is favourable to improving low-temperature impact toughness, and the adding scope is 0-5%.
Cr has the effect that improves intensity and quenching degree, improves the ability of the corrosion-resistant and elevated temperature strength of weld seam.But the effect that reduces low-temperature impact toughness and percentage elongation is arranged, and Cr content is 2-2.8.
Mo has the effect that improves heat resistance, and low-temperature impact toughness is descended, and content is for being controlled at .0.9-1.5.
The fluoride and/or the oxide that contain rare earth metal in the described medicine core, its content are amounted to rare earth metal, and to account for welding wire gross mass % be 0.005-0.2.Oxide TiO in the described medicine core
2+ SiO
2+ ZrO
2The content sum to account for welding wire gross mass % be 5-7.Add CaCO3 and/or CaF2 in the medicine core, it is 0.2-0.4 that the content of wherein amounting to CaO accounts for welding wire gross mass %, and the fluoride in the described welding wire is amounted to F 0.1-0.35.To account for welding wire gross mass % be 0.06-0.15 to the content of C in described medicine core and the carbon steel crust.
The used protective gas of welding wire of the present invention is the Ar+CO2 mist, and wherein Ar is 80%, and CO2 is 20%.
Because S, P, Sn, Bi have the crackle tendency that increases weld seam, therefore must carry out strict control to its impurity in carbon steel crust and medicine core powder.Guarantee in welding wire by quality %S＜0.015 P＜0.020, Sn＜0.001, Bi＜0.001.S, P, Sn, Bi sum are not more than 0.035.
At the interior charge core powder of crust (wide 14 millimeters, thick 0.9 millimeter) that mild-carbon steel strip is made, filling rate 14%-22% obtains the finished product welding wire of diameter 1.0-1.6 millimeter behind the overmolding tube reducing.
Each component content of medicine core is changed the back press different-diameter, different filling rates are made welding wire and are tested.Its medium carbon steel crust and medicine core composition and content 5 kinds of welding wires within the scope of the present invention are respectively sample 1-sample 6,4 kinds of welding wires that carbon steel crust and medicine core composition and content exceed beyond the scope of the invention are respectively contrast 7-contrast 10, each test diameter of flux-cored wire, filling rate and medicine core each component see Table 3-1, table 3-2.
Table 3-1: welding wire and medicine core component proportioning test table
| Contrast 9 | 1.2 | 22.12 | 7 | 0.56 | 0.9 | 0.4 | 0.45 | 2.0 | 0.20 | 0.05 | 0.10 |
| Contrast 10 | 1.4 | 15.74 | 4.3 | 0.59 | 0.55 | 0.45 | 0.46 | 2.1 | 0.20 | 0.07 | 0.12 |
Table 3-2: welding wire and medicine core component proportioning test table
Annotate: other hurdles include rare-earth oxide and/or rare earth metal fluoride and S, P, impurity such as Sn, B
The mechanical property soldering test, general welding condition: 20 millimeters of electrode extensions, 20 liters/minute of gas flows.Using gases: Ar+CO2 mist Ar:80%: CO2:20%
1. deposited metal welding condition is referring to table 4.
Table 4: deposited metal Mechanics Performance Testing welding condition
| Project | Welding condition |
| Welding current | 220-240A |
| Weldingvoltage | 26-28V |
| The welding number of plies | 7 layer of 14 road |
| Temperature between the road | 150℃ |
| Speed of welding | 250 millimeters/minute |
| Weld width | The 2/3-4/5 weld width |
690 ℃ of insulations of postwelding heat treatment in 2 hours
2.2.25Cr1Mo 60 millimeters slab welding conditions of steel are referring to table 5.
Table 5:60 millimeter slab Mechanics Performance Testing welding condition
| Project | Welding condition |
| Welding current | 200-220A |
| Weldingvoltage | 26-28V |
| The welding number of plies | 22 layer of 69 road |
| Temperature between the road | 150-170℃ |
| Speed of welding | 250 millimeters/minute |
| Preheat temperature | 120℃ |
690 ℃ of insulations of postwelding heat treatment in 2 hours.
The crack resistance soldering test
Cracking test: tiltedly Y tests with reference to GB4675.1,80 ℃ of preheat temperatures.
2 groups 10 equal flawlesses of sample of cracking test.
The overall merit of test welding wire performance
Welding wire overall merit: welding wire overall merit is referring to table 6, table 7, table 8.
Table 6: welding wire overall merit
Wherein: the expression of welding technological properties and overall merit: good is ◎, is zero well, and passing is △, fail for *.
Table 7: welding wire mechanical property
| Yield strength ReH | Tensile strength Rm | Percentage elongation A% | Low-temperature impact toughness AKV v (J) | |
| Sample 1 | 615 | 670 | 18.5 | 93 118 78 |
| Sample 2 | 615 | 675 | 19 | 74 87 81 |
| Sample 3 | 640 | 715 | 17.5 | 78 83 86 |
| Sample 4 | 575 | 640 | 20.5 | 74 87 83 |
| Sample 5 | 575 | 640 | 19.5 | 48 66 53 |
| Sample 6 | 570 | 660 | 19 | 68 88 86 |
| Contrast 7 | - | 875 | 14 | 53 52 54 |
| Contrast 8 | 750 | 870 | 14.5 | 36 40 38 |
| Contrast 9 | 675 | 795 | 14 | 23 23 15 |
| Contrast 10 | 590 | 670 | 20 | 148 155 142 |
60 millimeters slab different parts of table 8:2.25Cr1Mo steel low-temperature impact toughness
Through testing: the welding wire of sequence number sample 1-sample 6 takes off slag and appearance of weld is good, the pore-free air drain, and good mechanical properties is adapted to all-position welding.
Contrast Mn too high levels in 7 welding wires, greater than 2.2%, the too high no remarkable yield intensity of intensity, low-temperature impact toughness reduces.
Contrast content sum that alkali metal oxide in 8 welding wires and/or fluoride amount to Na, K, Li greater than 0.35%, electric arc is elongated, the flue dust and the increase of splashing, the tenesmus of vertical position welding molten iron, the vertical position welding poor mechanical property, and do not have the crystal grain thinning effect of B, Ti, low-temperature impact toughness reduces.
Contrast in 9 welding wires filling rate and surpass 20%, TiO
2+ SiO
2+ ZrO
2Greater than 7%, easily produce the weld porosity load mould, simultaneously owing to the oxygen content height, low-temperature impact toughness reduces.
It is higher to contrast in 10 welding wires low-temperature impact toughness, but Cr content is low, and chemical composition is defective, and its intensity, hear resistance and welding technological properties all can not meet the demands.
Claims (6)
1. a chromium-molybdenum-seel flux welding wire for gas shielded arc welding comprises carbon steel crust and medicine core, and forming quality % is mild steel crust 78-86, and medicine core 14-22 is characterized in that: it is as follows that the composition of described medicine core and content account for welding wire gross mass %: TiO
24-6, Si 0.2-0.5, Mn 1-2.2, SiO
20.1-1, ZrO
20.1-0.5, Cr 2-2.8, Mo 0.9-1.5, Ni 0-5, B 0.002-0.01, Ti 0.02-0.3, Fe 2-6, Al+Mg 0.4-0.75, K, Na, Li alkali metal oxide and/or fluoride are amounted to the content 0.1-0.35 of K, Na, Li, K 0.02-0.07 wherein, and Na or Li or both sums are 0.08-0.3, fluoride is amounted to F 0.1-0.35, and S, P, Sn, Bi sum are not more than 0.035 in described carbon steel crust and the medicine core powder.
2. a kind of chromium-molybdenum-seel flux welding wire for gas shielded arc welding according to claim 1 is characterized in that: contain the fluoride and/or the oxide of rare earth metal in the described medicine core, its content is amounted to rare earth metal, and to account for welding wire gross mass % be 0.005-0.2.
3. a kind of carbon dioxide gas arc welding chromium-molybdenum-seel flux welding wire according to claim 1 is characterized in that: oxide TiO in the described medicine core
2+ SiO
2+ ZrO
2The content sum to account for welding wire gross mass % be 5-7.
4. a kind of carbon dioxide gas arc welding chromium-molybdenum-seel flux welding wire according to claim 1; it is characterized in that: in the medicine core, add CaCO3 and/or CaF2; it is 0.2-0.4 that the content of wherein amounting to CaO accounts for welding wire gross mass %, and the fluoride in the described welding wire is amounted to F 0.1-0.35.
5. a kind of carbon dioxide gas arc welding chromium-molybdenum-seel flux welding wire according to claim 1, to account for welding wire gross mass % be 0.06-0.15 to the content of C in described medicine core and the carbon steel crust.
6. a kind of carbon dioxide gas arc welding chromium-molybdenum-seel flux welding wire according to claim 1 is pressed quality %S 0-0.015, P 0-0.020, Sn 0-0.001, Bi 0-0.001 in described carbon steel crust and the medicine core powder.
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| CN106624449A (en) * | 2017-01-18 | 2017-05-10 | 武汉铁锚焊接材料股份有限公司 | Flux-cored wire used for oceanographic engineering big thick plate heat treatment and preparing method and application of flux-cored wire |
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| CN112872651A (en) * | 2021-01-26 | 2021-06-01 | 华能国际电力股份有限公司 | Flux core, preparation method of flux core, flux-cored wire and welding method |
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2008
- 2008-03-14 CN CN200810047067A patent/CN100574964C/en not_active Expired - Fee Related
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| CN111886110A (en) * | 2018-03-29 | 2020-11-03 | 株式会社神户制钢所 | Flux-cored wire |
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| CN117506228A (en) * | 2024-01-04 | 2024-02-06 | 山东聚力焊接材料有限公司 | Efficient composite steel core stainless steel welding rod and preparation method thereof |
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