CN102489901B - Gas protective welding flux cored wire for welding heat resistant steel - Google Patents
Gas protective welding flux cored wire for welding heat resistant steel Download PDFInfo
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- CN102489901B CN102489901B CN2011104077579A CN201110407757A CN102489901B CN 102489901 B CN102489901 B CN 102489901B CN 2011104077579 A CN2011104077579 A CN 2011104077579A CN 201110407757 A CN201110407757 A CN 201110407757A CN 102489901 B CN102489901 B CN 102489901B
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Abstract
The invention belongs to a gas protective welding flux cored wire for welding heat resistant steel. The gas protective welding flux cored wire comprises low-carbon steel metal skin and a flux core, wherein the low-carbon steel metal skin comprises the following components in percentage by weight: 0.01 to 0.1 percent of C, 0.1 to 0.4 percent of Mn, 0.01 to 0.03 percent of Si, 0.005 to 0.015 percent of S, 0.005 to 0.015 percent of P and the balance of iron; the flux core accounts for 14 to 25 percent of the total weight of the welding wire and comprises the following components in percentage by weight: 1.2 to 3.0 percent of medium-carbon ferromanganese, 0.20 to 2.0 percent of ferrosilicon powder, 0.05 to 0.5 percent of magnesium powder, 1.5 to 2.0 percent of metal chromium powder, 0.2 to 2.0 percent of ferromolybdenum powder, 0.05 to 0.2 percent of electrically fused magnesia, 0.01 to 0.3 percent of fluoride and 7 to 15 percent of iron powder; and the components are mixed uniformly, the mixture is coiled on a thin steel strip made of low-carbon steel to form strips, and the strips are drawn to form wires. The gas protective welding flux cored wire has the characteristics of no molten slag on deposited metal after welding, capability of performing continuous multi-layer welding without slag removal, high welding process property, stable electric arcs, small splatter, attractive appearance of weld joints and the like, the welding efficiency is improved by 20 to 40 percent, and vertical downward welding can be realized by short circuiting transfer.
Description
Technical field
The invention belongs to Metal Material Welding production welding wire, particularly a kind of gas protective welding flux cored wire for welding heat resistant steel; This flux-cored wire especially is suitable for operating temperature and uses welding and the continuous welding of not scarfing cinder multilayer of heat resisting steel lower than the 15CrMoR class low-alloy container of 520 ℃.
Background technology
The 15CrMoR steel is the pearlite heatproof steel of countries in the world extensive use, its chemical composition (percentage by weight) is: C:0.12-0.18%, Cr:0.80-1.20%, Mo.0.45-0.60%, Mn:0.40-0.70%, Si:0.15-0.40%, S≤0.010%, P≤0.025%, and surplus is iron and inevitable impurity; Its mechanical property is tensile strength Rm:450-590MPa, yield strength ReL >=275MPa, percentage elongation A >=19%, 20 ℃ kv >=31J, be the main steel grade for the manufacture of superheater, header and the main steam line of high pressure, super-pressure, Subcritical Utility Boiler, this steel grade welding performance is good.Welding material commonly used has welding rod, solid core welding wire, common flux-cored wire (acid, alkalescence).While adopting the welding rod welding, every root bead bar all will be lost the discard electrode of 20～30mm, can cause the waste of material; And common flux-cored wire is compared with solid welding wire, under same condition, the deposition rate of flux-cored wire is than the high 20-30% of solid core welding wire; In the patent No., be that the patent documentation that 200710185054.X, denomination of invention are " flux-cored wire for gas shielded arc welding for creep-resisting steels " discloses a kind of with TiO
2Be main Mayari flux-cored wire, although this welding wire has toughness characteristics preferably, in welding process, can produce a large amount of slags, not only reduced welding efficiency, but also increased welder's labour intensity.In order to reduce slag amount in the flux-cored wire welding process, up to the present, a lot of schemes were proposed, as: the patent documentation that be 200680010604.8 in the patent No., denomination of invention is " metallic flux cored wire and use its welding method and the preparation method of the few high-fatigue strength welding point of the quantity of slag " discloses a kind of graphitiferous and SiO of adding in the medicine core
2, Al
2O
3, Na
2O and K
2The flux-cored wire of one or more oxides of O; And be 200710166801.5 in the patent No., patent documentation that denomination of invention is " flux-cored wire for gas shielded arc welding for creep-resisting steels " discloses a kind of at the metal-cored flux-cored wire that has added the oxides such as ferriferous oxide containing 0.5-2.5%, Mn oxide; Improve liquidity and the effect of stabilising arc, and can reach to a certain extent the purpose that reduces the slag amount although can play the adding of above-mentioned oxide, the slag amount after welding still more, need just can carry out the multilayer continuous welding after scarfing cinder.Thereby this type of patented technology still exists and can not realize that continuous multilayer welds, welding efficiency is low, operator's the defects such as labour intensity height.
Summary of the invention
The purpose of this invention is to provide a kind of gas protective welding flux cored wire for welding heat resistant steel, use welding and the continuous welding of not scarfing cinder multilayer of heat resisting steel lower than the 15CrMoR class low-alloy container of 520 ℃ for the welding job temperature, to reach the rear slag of effective reduction welding, can carry out the welding of not scarfing cinder continuous multilayer, effectively improve weld seam overall performance and welding efficiency; And welding technological properties is good, arc stability, splash little, appearance of weld is attractive in appearance, and also can realize the purpose such as vertical welding downwards by short circuiting transfer.
The solution of flux-cored wire of the present invention is the metal sheath of the metal sheath of the welding wire mild steel (Thin Strip Steel) that to adopt containing C0.01-0.1wt%, Mn0.1-0.4wt%, Si0.01-0.03wt%, S0.005-0.015wt%, P0.005-0.015wt%, surplus be iron as welding wire; In its medicine core each composition with the weight percent meter of whole welding wires, be respectively: medium carbon manganese iron powder 1.2-3.0wt%, ferrosilicon powder 0.20-2.0wt%, magnesium (Mg) powder 0.05-0.5wt%, crome metal (Cr) powder 1.5-2.0wt%, molybdenum-iron powder 0.2-2.0wt%, fused magnesite 0.05-0.2wt%, fluoride 0.01-0.3wt%, iron powder 7-15wt%; After each composition in the medicine core mixes, be placed on the thin steel band of low-carbon (LC) of welding wire crust, roll (parcel) slivering and be pulled to into the silk of requirement diameter.
The content of above-mentioned flux-cored wire Chinese medicine core accounts for the 14-25wt% of whole welding wire weight, the diameter of medicine core is Φ 1.0-3.0mm.In described flux-cored wire, the weight ratio of Mn and Si is 3-8.Described fluoride is one or more in calcirm-fluoride, sodium fluoride, potassium fluotitanate and oryolite.And the Hydrogen Diffusion in Deposited Metal after flux-cored wire welding of the present invention is less than 4mL/100g.
In medicine core of the present invention, the Main Function of each composition is as follows:
Mid-carbon fe-mn: manganese is important deoxidier, is also the important alloying constituent of weld metal simultaneously.Intensity and the toughness of Resistance of Weld Metal have material impact.Manganese can reduce austenite to the ferritic transformation temperature, promotes AF (acicular ferrite) to form; The increase of manganese content can improve the low-temperature impact toughness of weld seam, but contrary when too high, in addition, manganese can also form MnS with sulphur, reduces the impurity content of weld seam.
Ferrosilicon: silicon is that important deoxidier is also the important alloying constituent of weld metal simultaneously, and silicon can reduce the oxygen content of weld metal, improves the impact flexibility of weld metal, but contrary when too high; Adopt its effect of silicomanganese combined deoxidation better.
The magnesium powder: magnesium is strong deoxidier, and the oxygen content of controlling weld metal is had to important function, can also play the effect of stabilising arc simultaneously; But can increase weld fumes during too high levels, in welder's unhealthy profit.
Crome metal: chromium is the alloying component that heat resisting steel is commonly used, and chromium can play the effect of crystal grain thinning in alloy, in all metal carbides, the carbide of chromium is the most tiny a kind of, and can be evenly distributed in the steel body; The effect of the grain growth of obstruction is arranged under the high heat condition of short time, thereby can reduce weld seam (deposited metal) to overheated sensitlzing effect (property).
Molybdenum-iron: molybdenum can significantly improve the intensity of weld metal, and the effect of crystal grain thinning is also arranged, and can reduce overheated tendentiousness and the temper brittleness of weld metal, and suitable molybdenum-iron addition can improve intensity, hardness and the heat endurance of weld seam; But too highly can affect weld metal toughness.
Fused magnesite: for improving appearance of weld, increase slag basicity, improve the low-temperature flexibility of weld seam, the gas permeability of slag is had to certain help.
Fluoride: the present invention selects one or more in calcirm-fluoride, sodium fluoride, potassium fluotitanate and oryolite, in order to reduce the content of Diffusible Hydrogen In Deposited Metal; But content of fluoride is too high, during welding, electric arc is unstable, splashing becomes large, electric arc sound variation.
Iron powder: add the core that is used as medicine in the medicine core and can improve welding efficiency and provide a small amount of oxygen for stabilising arc, in order to guarantee high deposition efficiency.
Thereby the present invention is by organic assembly of above-mentioned drug core component and coordinate and realize its goal of the invention with the mild steel crust.
After adopting welding wire of the present invention to be welded with heat resisting steel 15CrMoR class low-alloy container, tensile strength >=the 550MPa of its deposited metal, yield strength >=470MPa, percentage elongation >=19%, normal temperature impact and reach 90J, and the deposited metal diffusible hydrogen content is less than 4mL/100g; Effectively improved the weld seam overall performance, welding efficiency improves 20-40%, and the integrated cost of welding wire production and use is low.But thereby after the slag amount after tool decrease of the present invention (elimination) welding, welding, on deposited metal, almost without slag, exist, can carry out the welding of not scarfing cinder continuous multilayer, effectively improved overall performance and the welding efficiency of weld seam; And welding technological properties is good, arc stability, splash little, appearance of weld is attractive in appearance, and also can realize the characteristics such as vertical welding downwards by short circuiting transfer.
The specific embodiment
Embodiment 1: adopt the crust of the steel band of (wide * thick) 14 * 0.9mm as welding wire, its chemical composition is that CO.04wt%, Mn0.25wt%, Si0.015wt%, S0.01wt%, P0.01wt%, surplus are iron; It is example that the 100Kg welding wire is produced in the preparation of take, the present embodiment medicine core accounts for the 15wt% that whole welding wire is heavy, and in the medicine core, each composition is: mid-carbon fe-mn 2.4Kg, ferrosilicon powder 1.0Kg, magnesium (Mg) powder 0.2Kg, crome metal (Cr) powder 1.5Kg, molybdenum-iron powder 0.9Kg, fused magnesite 0.1Kg, calcirm-fluoride 0.2Kg, add iron powder 8.7Kg to medicine core batching gross weight 15Kg; Then by each composition in the medicine core, mix rear stand-by;
Steel band is placed in the welding wire forming machine, successively stand-by medicine core compound is injected and laterally is bent in the steel band groove of " U " type, and then roll slivering, silk through being pulled to Φ 1.2mm again.
The present embodiment is at welding parameter: I=250-260A, U=28-30V, gas flow 20L/min, 80%Ar+ surplus CO
2, the 15CrMoR steel to be welded, the post weld heat treatment ginseng is: 620 ℃, permanent (guarantor) warm 1h; Its:
Deposited metal composition (wt%)
| C | Mn | Si | S | P | Cr | Mo |
| 0.07 | 0.9 | 0.4 | 0.007 | 0.010 | 1.15 | 0.45 |
Deposited metal mechanical performance (mist):
Diffusible hydrogen content: 3.2mL/100g.
Embodiment 2: the crust of welding wire is identical with EXAMPLE l, it is example that the 100Kg welding wire is produced in the preparation of take, the present embodiment medicine core accounts for the 20wt% that whole welding wire is heavy, and in the medicine core, each composition is: mid-carbon fe-mn 2.4Kg, ferrosilicon powder 1.0Kg, magnesium (Mg) powder 0.2Kg, crome metal (Cr) powder 1.5Kg, molybdenum-iron powder 0.9Kg, fused magnesite 0.1Kg, calcirm-fluoride and potassium fluotitanate 0.2Kg (each 0.1Kg), add iron powder 13.7Kg to medicine core batching gross weight 20Kg; All the other are identical with embodiment 1, its:
Deposited metal composition (wt%)
| C | Mn | Si | S | P | Cr | MO |
| 0.07 | 0.9 | 0.3 | 0.007 | 0.010 | 1.15 | 0.45 |
[0028] Deposited metal mechanical performance (mist):
Diffusible hydrogen content: 3.6mL/100g.
The crust of embodiment 3. welding wires is identical with embodiment 1, it is example that the 100Kg welding wire is produced in the preparation of take, the present embodiment medicine core accounts for the 20wt% that whole welding wire is heavy, and in the medicine core, each composition is: mid-carbon fe-mn 2.4Kg, ferrosilicon powder 1.0Kg, magnesium (Mg) powder 0.2Kg, crome metal (Cr) powder 1.5Kg, molybdenum-iron powder 0.9Kg, fused magnesite 0.1Kg, sodium fluoride and potassium fluotitanate 0.24Kg (each 0.12Kg), add iron powder 13.66Kg to medicine core batching gross weight 20Kg.Then by each composition in the medicine core, mix rear stand-by;
Steel band is placed in the welding wire forming machine, successively stand-by medicine core compound is injected and laterally is bent in the steel band groove of " U " type, and then roll slivering, the silk through being pulled to Φ 2.0mm.
The present embodiment is at welding parameter: I=350-360A, U=30-31V, gas flow 25L/min, 80%Ar+ surplus CO
2, the 15CrMoR steel to be welded, the post weld heat treatment ginseng is: 620 ℃, permanent (guarantor) warm 1h; Its:
Deposited metal composition (wt%)
| C | Mn | Si | S | P | Cr | MO |
| 0.04 | 0.9 | 0.4 | 0.007 | 0.010 | 1.15 | 0.45 |
Deposited metal mechanical performance (mist):
Diffusible hydrogen content: 3.5mL/100g.
Claims (5)
1. a gas protective welding flux cored wire for welding heat resistant steel, comprise metal sheath and be located at the medicine core of outer intracutaneous, it is characterized in that the metal sheath of the metal sheath mild steel that to adopt containing C0.01-0.1wt%, Mn0.1-0.4wt%, Si0.01-0.03wt%, S0.005-0.015wt%, P0.005-0.015wt%, surplus be iron as welding wire; In its medicine core each composition with the weight percent meter of whole welding wires, be respectively: medium carbon manganese iron powder 1.2-3.0wt%, ferrosilicon powder 0.20-2.0wt%, magnesium powder 0.05-0.5wt%, hafnium metal powfer 1.5-2.0wt%, molybdenum-iron powder 0.2-2.0wt%, fused magnesite 0.05-0.2wt%, fluoride 0.01-0.3wt%, iron powder 7-15wt%; After each composition in the medicine core mixes, be placed on the thin steel band of mild steel of welding wire crust, roll slivering and be pulled to into the silk of requirement diameter.
2. by the described gas protective welding flux cored wire for welding heat resistant steel of claim 1, it is characterized in that the diameter that the content of described flux-cored wire Chinese medicine core accounts for the 14-25wt% of whole welding wire weight, medicine core is Φ 1.0-3.0mm.
3. by the described gas protective welding flux cored wire for welding heat resistant steel of claim 1, it is characterized in that in described flux-cored wire, the weight ratio of Mn and Si is 3-8.
4. by the described gas protective welding flux cored wire for welding heat resistant steel of claim 1, it is characterized in that described fluoride is one or more in calcirm-fluoride, sodium fluoride, potassium fluotitanate and oryolite.
5. by the described gas protective welding flux cored wire for welding heat resistant steel of claim 1, it is characterized in that the Hydrogen Diffusion in Deposited Metal after described flux-cored wire welding is less than 4mL/100g.
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| CN2011104077579A CN102489901B (en) | 2011-12-09 | 2011-12-09 | Gas protective welding flux cored wire for welding heat resistant steel |
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| CN102489901B true CN102489901B (en) | 2013-12-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103551758B (en) * | 2013-10-11 | 2015-08-05 | 四川大西洋焊接材料股份有限公司 | A kind of nuclear power engineering high-toughness metal powder type flux-cored wire |
| CN104148824B (en) * | 2014-09-01 | 2015-12-09 | 四川大西洋焊接材料股份有限公司 | A kind of high tenacity flux-cored wire for electrogas arc welding |
| CN106624450B (en) * | 2017-02-08 | 2019-04-12 | 四川大西洋焊接材料股份有限公司 | A kind of ultra supercritical heat-resistant steel flux-cored wire and preparation method thereof |
| CN107717257B (en) * | 2017-11-27 | 2020-02-14 | 四川大西洋焊接材料股份有限公司 | Flux-cored wire matched with ultra-supercritical heat-resistant steel and preparation method thereof |
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| CN1714986A (en) * | 2005-07-08 | 2006-01-04 | 湘潭大学 | High chromium cast iron self protective build-up welding cored welding wire and its usage |
| CN101450425A (en) * | 2008-12-31 | 2009-06-10 | 宁波隆兴焊割科技股份有限公司 | Heat-resisting steel flux-cored wire |
| CN101633086A (en) * | 2008-07-23 | 2010-01-27 | 中冶集团建筑研究总院 | Flux-cored wire used for backing build-up welding of semi-steel roll |
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| CN102248325A (en) * | 2011-07-19 | 2011-11-23 | 燕山大学 | Titanium carbide ceramic-enhanced visible arc self-shielded flux-cored wire for high-chromium cast iron |
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| JP3815984B2 (en) * | 2001-07-06 | 2006-08-30 | 株式会社神戸製鋼所 | Flux-cored wire for gas shielded arc welding for low alloy heat resistant steel |
| JP2008126279A (en) * | 2006-11-21 | 2008-06-05 | Nippon Steel Corp | Flux-cored wire for gas shielded arc welding |
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Patent Citations (5)
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| CN1714986A (en) * | 2005-07-08 | 2006-01-04 | 湘潭大学 | High chromium cast iron self protective build-up welding cored welding wire and its usage |
| CN101633086A (en) * | 2008-07-23 | 2010-01-27 | 中冶集团建筑研究总院 | Flux-cored wire used for backing build-up welding of semi-steel roll |
| CN101450425A (en) * | 2008-12-31 | 2009-06-10 | 宁波隆兴焊割科技股份有限公司 | Heat-resisting steel flux-cored wire |
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| CN102248325A (en) * | 2011-07-19 | 2011-11-23 | 燕山大学 | Titanium carbide ceramic-enhanced visible arc self-shielded flux-cored wire for high-chromium cast iron |
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