CN109317862A - 25CrNiMoV gas shielded type flux-cored wire and preparation method thereof - Google Patents

25CrNiMoV gas shielded type flux-cored wire and preparation method thereof Download PDF

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Publication number
CN109317862A
CN109317862A CN201811339057.9A CN201811339057A CN109317862A CN 109317862 A CN109317862 A CN 109317862A CN 201811339057 A CN201811339057 A CN 201811339057A CN 109317862 A CN109317862 A CN 109317862A
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China
Prior art keywords
powder
cored wire
25crnimov
gas shielded
flux
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Inventor
张敏
仝雄伟
程康康
李洁
贾芳
许帅
董玉凡
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Xian University of Technology
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Xian University of Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053Fe as the principal constituent
    • B23K35/308Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40Making wire or rods for soldering or welding

Abstract

The invention discloses 25CrNiMoV gas shielded type flux-cored wires; including medicine core and weldering skin; wherein medicine core is composed of the following components by mass percentage: silicon powder 1%-4%; manganese powder 3%-7%; chromium powder 8%-12%; nickel powder 7%-11%, molybdenum powder 3%-5%, vanadium powder 2%-5%; golden red mountain flour 8%-13%; Fluorspar Powder 25%-30%, zircon flour 6%-13%, Paris white 2%-7%; brown iron oxide 3%-10%; Al-Mg alloy powder 2%-7%, remaining is iron powder, and the sum of above constituent mass percentage is 100%.Flux-cored wire appearance of weld of the present invention is beautiful, can obtain martensite seam organization, and welding point has excellent mechanical property and corrosion resistance.The invention also discloses preparation method, this method is simple to operation.

Description

25CrNiMoV gas shielded type flux-cored wire and preparation method thereof
Technical field
The invention belongs to Metal Material Welding technical fields, and in particular to a kind of 25CrNiMoV gas shielded type medicine core weldering Silk, the invention further relates to the preparation methods of the welding wire.
Background technique
25CrNiMoV is low-carbon alloy steel, containing precipitation-strengthening element Cr, Ni, Mo and V, is generally used for manufacture steam turbine High inter case (generally with low-carbon or middle carbon Cr, Mo, V steel making), in higher temperature (300~570 DEG C) and higher stress It is operated under (35~25MPa), there is tempering upper bainite tissue.25CrNiMoV will have other than higher room temperature performance, also there is height Creep rupture strength and high temperature creep strength also need that Cr, Mo, V etc. are added into steel for this purpose, in addition to properly increasing carbon content Reinforced alloys element.In order to obtain uniform tissue and good strength character, guarantee that center portion is precipitated without free ferrite, need to Ni, Cr are added in steel to improve harden ability.Meanwhile the tissue after 25CrNiMoV normalizing is ferrite+pearlite, alloying element Content is less, and total amount is 5% hereinafter, being Mayari.There are enough elevated temperature strengths, antioxygen in its use temperature range Changing corrosive nature and good tissue property's stability, this kind of steel also has the ability of good sulfur resistive and hydrogen-type corrosion, and work Skill is functional, cheap, is widely used in petroleum, chemical industry, electric power and other industrial departments.25CrNiMoV The chemical component of low-carbon alloy steel be Si≤0.3%, Mn≤0.7%, Ni1.00%-1.50%, Cr1.00%-1.50%, Mo%0.25-0.45%, V0.05%-0.15% etc..
Summary of the invention
The object of the present invention is to provide a kind of 25CrNiMoV gas shielded type flux-cored wires, with good Welder Skill performance, spatter is few, and appearance of weld is beautiful.
It is a further object to provide a kind of 25CrNiMoV preparation methods of gas shielded type flux-cored wire.
The technical scheme adopted by the invention is that 25CrNiMoV gas shielded type flux-cored wire, including medicine core and weldering skin, Wherein medicine core is composed of the following components by mass percentage: silicon powder 1%-4%, manganese powder 3%-7%, chromium powder 8%-12%, nickel powder 7%-11%, molybdenum powder 3%-5%, vanadium powder 2%-5%, golden red mountain flour 8%-13%, Fluorspar Powder 25%-30%, zircon flour 6%-13%, Paris white 2%-7%, brown iron oxide 3%-10%, Al-Mg alloy powder 2%-7%, remaining is iron powder, above group Dividing the sum of mass percent is 100%.
The features of the present invention also characterized in that:
Weldering skin is mild steel steel band.
The loading of medicine core powder is 15wt%-20wt% in flux-cored wire.
Another technical solution of the present invention is the preparation of above-mentioned 25CrNiMoV gas shielded type flux-cored wire Method, the specific steps are as follows:
Step 1: weighing silicon powder 1%-4%, manganese powder 3%-7%, chromium powder 8%-12%, nickel powder respectively by mass percentage 7%-11%, molybdenum powder 3%-5%, vanadium powder 2%-5%, golden red mountain flour 8%-13%, Fluorspar Powder 25%-30%, zircon flour 6%-13%, Paris white 2%-7%, brown iron oxide 3%-10%, Al-Mg alloy powder 2%-7%, remaining is iron powder, above group Dividing the sum of mass percent is 100%;
Step 2: the weighed golden red mountain flour of step 1, Fluorspar Powder, zircon flour, Paris white, brown iron oxide and magnalium are closed Bronze is mixed to get mixed powder A, and sodium silicate binder is added into mixed powder A and is uniformly mixed, is then placed into heating It is sintered in furnace, pulverizes, is sieved, obtain mixed powder B;
Step 3: the weighed silicon powder of step 1, manganese powder, chromium powder, nickel powder, molybdenum powder, vanadium powder and iron powder and step 2 being obtained mixed It closes medicinal powder B to be uniformly mixed, is placed in drying oven and dries, obtain medicine core powder;
Step 4: the medicine core powder that step 3 obtains being wrapped in mild steel steel band by flux-cored wire producing machine, and is adopted Mild steel steel band is closed with molding machine, obtains welding wire semi-finished product, carries out drawing again with acetone wiped clean, being drawn to diameter is 1.2-1.6mm;
Step 5: after welding wire semi-finished product are through step 4 drawing, wiping the greasy dirt on welding wire with the cotton for being moistened with acetone, obtain To 25CrNiMoV gas shielded type flux-cored wire.
The features of the present invention also characterized in that
In step 2: sintering temperature is 650 DEG C -750 DEG C, sintering time 4-6h, and be sieved granularity 60-140 mesh.
In step 3: drying temperature is 200 DEG C -300 DEG C, drying time 2h-3h.
In step 4: mild steel width of steel band is 7mm, thickness 0.3mm.
In step 4: the loading of medicine core powder is 15wt%-20wt% in welding wire.
The beneficial effects of the present invention are:
(1) flux-cored wire of the present invention is compared with stainless steel electrode, solid welding wire, has that spatter is few, appearance of weld is beautiful The advantages of sight, good welds processing performance;It can be used for continuous wire feed automatic welder, there is saving and protection gas and higher production Efficiency;
(2) flux-cored wire of the present invention generates slag using mineral slag system, protects the molten bath formed when welding, plays The effect of gas shielded;
(3) preparation method of flux-cored wire of the present invention is simple, easy to operate, can be used for mass production.
Specific embodiment
The present invention is described in detail With reference to embodiment.
25CrNiMoV of the present invention gas shielded type flux-cored wire, including medicine core and weldering skin, wherein medicine core is by mass percentage It is composed of the following components: silicon powder 1%-4%, manganese powder 3%-7%, chromium powder 8%-12%, nickel powder 7%-11%, molybdenum powder 3%-5%, Vanadium powder 2%-5%, golden red mountain flour 8%-13%, Fluorspar Powder 25%-30%, zircon flour 6%-13%, Paris white 2%- 7%, brown iron oxide 3%-10%, Al-Mg alloy powder 2%-7%, remaining is iron powder, and the sum of above constituent mass percentage is 100%.
Weldering skin is mild steel steel band.
The loading of medicine core powder is 15wt%-20wt% in flux-cored wire.
The effect of each component and function are as follows in the welding wire:
Silicon, Si also come from the pig iron and deoxidier.Si deoxidizing capacity ratio Mn is strong, is main deoxidier, can eliminate FeO and be mingled with Adverse effect to steel.Si can be acted on FeO and be formed SiO2, it is excluded subsequently into clinker.Si is in addition to forming SiO2As Other than impurity is present in steel, Si is mainly dissolved in ferrite at room temperature, therefore Si has invigoration effect to steel;
Manganese, Mn are among the austenite stabilizing elements, and the addition of manganese can significantly reduce austenite that structural transformation is to ferrite The temperature of transformation.Meanwhile manganese effect in terms of reducing brittle transition temperature is obvious.There are also certain deoxidization desulfurations for manganese in medicine core Effect, can generate manganese oxide, and stable manganese sulfide can also be generated with reaction of Salmon-Saxl in conjunction with manganese, reduce weld seam with this The generation of middle low melting point phase iron sulfide improves the heat resistanceheat resistant crackle ability of weld metal;
Chromium, Cr are the element for promoting ferrite to form and stablize in deposited metal, add chromium herein, are on the one hand The corrosion resistance for guaranteeing weld metal, on the other hand also has certain effect to the raising of intensity.Studies have shown that in mild steel On the basis of a certain amount of chromium is added, steel can both generated in the medium with oxidisability a kind of with matrix jail Consolidate the passivating film of the ferrochrome oxide closed;The pitting potential value of steel can be effectively improved again, reduce steel to the sensibility of spot corrosion. Influence of the chromium to intensity, which shows as suitable chromium, can improve the obdurability of weld metal, but as the excess of chromium content adds Add, the precipitations of some intermetallic compounds tendency is gradually increased, their formation and in the presence of the plasticity and toughness that can significantly reduce steel and Corrosion resistance;
Nickel, Ni can be completely dissolved in austenite, and in welding High-temperature cooling process, Ni can substantially reduce austenite and turn Temperature, low phase transition temperature can guarantee the precipitation of uniformly tiny acicular ferrite, inhibit blocky pro-eutectoid ferrite Formation, be conducive to improve welding seam toughness;
Molybdenum, Mo can reduce austenite phase field, and austenite is solid-solution in weld seam or is deposited in the form of strong carbon compound Pro-eutectoid ferrite transformation can postponed and advantageously forming bainite structure, a small amount of Mo, which is added, will make deposited metal Intensity greatly improve but also toughness can be improved.The combination of Mo-Ti can more optimize seam organization after addition trace Ti, make to weld The tissue of seam is more uniform, and impact flexibility is improved significantly;
Fluorite is a kind of important materials of hydrogen controlled electrode, and main function is slag making, and in basic slag, it can reduce slag Fusing point, viscosity and surface tension increase the mobility of slag, it is possible to reduce the gaseous impurity in weld metal has certain go Hydrogen effect.
Rutile, rutile belong to the substance of low ionizing element, there is stabilising arc, can improve the striking performance of welding wire simultaneously And the stability of arc burning is improved, and rutile also has the function of certain slag making, welding wire medicine core can be made molten in welding The characteristic of " short slag " is realized during change, it is highly beneficial to sprawling for weld seam molten metal, stable electric arc can also be played Effect, suitable rutile not only stabilising arc, but also reduction spatter, moreover it is possible to promote sprawling for molten pool metal, make appearance of weld Well to reduce the formation of stomata in weld seam;
The main function of zircon sand is to improve removability of slag energy.The main component of zircon sand is ZrO2And SiO2, wherein ZrO2It is The main component of slag making, while the physical property of adjustable slag improve the removability of slag.If proportion content does not have improvement very little The effect of the removability of slag has bulky grain molten drop in the welding process and produces when proportion content is excessive, can generate biggish fly It splashes, and molten bath further becomes excessive, is unfavorable for all-position welding;
Iron oxide is very important a kind of component in gas-shielded flux-cored wire slag system, can improve the surface of slag Power keeps face of weld bright and clean.But the addition of iron oxide equally can generate adverse effect to the performance of gas-shielded flux-cored wire, So the content of iron oxide is unsuitable excessively high;
Calcium carbonate, CaO is basic anhydride important in basic clinker, usually with CaCO in the development of wlding3Shape Formula is added.CaCO3It there is no phase is melted, can directly be decomposed by solid phase in arc space, form CaO and a large amount of CO2Gas, one Slag basicity, purification weld seam can be improved in aspect, and the gas on the other hand generated can be enclosed in outside welding reaction zone, by molten bath It is opened with harmful air exclusion, plays the role of effective gas shield;
It also needs that a small amount of almag is added in medicine core.Aluminium and magnesium are all good deoxidiers, in self-protection flux-cored wire Suitable Al and Mg, which is added, can play good precedent desoxydation and nitrogen fixation, and reacting the product of production largely can be into Enter slag, adjust the basicity of slag, improves the processing performance of welding wire.
The preparation method of 25CrNiMoV gas shielded type flux-cored wire, the specific steps are as follows:
Step 1: weighing respectively by mass percentage: silicon powder 1%-4%, manganese powder 3%-7%, chromium powder 8%-12%, nickel powder 7%-11%, molybdenum powder 3%-5%, vanadium powder 2%-5%, golden red mountain flour 8%-13%, Fluorspar Powder 25%-30%, zircon flour 6%-13%, Paris white 2%-7%, brown iron oxide 3%-10%, Al-Mg alloy powder 2%-7%, remaining is iron powder, above group Dividing the sum of mass percent is 100%.
Step 2: the weighed golden red mountain flour of step 1, Fluorspar Powder, zircon flour, Paris white, brown iron oxide and magnalium are closed Bronze is mixed to get mixed powder A, and sodium silicate binder is added into mixed powder A and is uniformly mixed, is then placed into heating It is sintered in furnace, pulverizes, is sieved, obtain mixed powder B;
In step 2: sintering temperature is 650 DEG C -750 DEG C, sintering time 4-6h, and be sieved granularity 60-140 mesh;
Step 3: the weighed silicon powder of step 1, manganese powder, chromium powder, nickel powder, molybdenum powder, vanadium powder and iron powder and step 2 being obtained mixed It closes medicinal powder B to be uniformly mixed, is placed in drying oven and dries, obtain medicine core powder;
In step 3: drying temperature is 200 DEG C -300 DEG C, drying time 2h-3h;
Step 4: the medicine core powder that step 3 obtains being wrapped in mild steel steel band by flux-cored wire producing machine, and is adopted Mild steel steel band is closed with molding machine, obtains welding wire semi-finished product, carries out drawing again with acetone wiped clean, being drawn to diameter is 1.2-1.6mm;
In step 4: mild steel width of steel band is 7mm, thickness 0.3mm;
In step 4: the loading of medicine core powder is 15wt%-20wt% in welding wire;
Step 5: after welding wire semi-finished product are through step 4 drawing, wiping the greasy dirt on welding wire with the cotton for being moistened with acetone, most Welding wire is straightened through wire drawing machine eventually, disk is at disk, sealed package, obtain 25CrNiMoV gas shielded type flux-cored wire.
Embodiment 1
Step 1: weighing silicon powder 20g, manganese powder 50g, chromium powder 120g, nickel powder 80g, molybdenum powder 30g, vanadium respectively by mass percentage Powder 30g, golden red mountain flour 100g, Fluorspar Powder 250g, zircon flour 90g, Paris white 40g, brown iron oxide 60g, Al-Mg alloy powder 50g, iron powder 80g;
Step 2: by the weighed golden red mountain flour of step 1, Fluorspar Powder, zircon flour, Paris white, brown iron oxide, magnalium conjunction Bronze is mixed to get mixed powder A, and sodium silicate binder is added into mixed powder A and is uniformly mixed, is then placed into heating 650 DEG C of sintering 4h in furnace pulverize, cross 60 mesh screens, obtain mixed powder B;
Step 3: the weighed silicon powder of step 1, manganese powder, chromium powder, nickel powder, molybdenum powder, vanadium powder and iron powder and step 2 being obtained mixed It closes medicinal powder B to be uniformly mixed, is placed in 200 DEG C of drying 2h in drying oven, obtains medicine core powder;
Step 4: by width be 7mm, thickness 0.3mm mild steel steel band be placed on welding wire molding machine put band machine on, lead to Stainless steel belt is rolled into U-type groove by the indent of overmolding machine, the medicine core powder that step 3 obtains is put into U-type groove, medicine core powder The filling rate at end is controlled 16%, then so that U-type groove is rolled closure with molding machine, is carried out being drawn to again with acetone wiped clean straight Diameter is 1.2mm, wipes the greasy dirt on welding wire with the cotton for being moistened with acetone, finally welding wire is straightened through wire drawing machine, disk is at disk, close Package dress, obtains 25CrNiMoV gas shielded type flux-cored wire.
Flux-cored wire made from embodiment 1 is suitable for flux cored wire arc welding (FCAW-S), protective gas CO2.Welding Condition are as follows: welding current 140-180A, weldingvoltage 15.5-24.5V.After tested, the tensile strength of welding point is 760Mpa, yield limit 599Mpa, the contraction percentage of area 18%, ballistic work 51J.Performance meets 25CrNiMoV low-carbon alloy The requirement of steel.
Embodiment 2
Step 1: weighing silicon powder 30g, manganese powder 40g, chromium powder 110g, nickel powder 70g, molybdenum powder 40g, vanadium respectively by mass percentage Powder 20g, golden red mountain flour 130g, Fluorspar Powder 260g, zircon flour 60g, Paris white 30g, brown iron oxide 50g, Al-Mg alloy powder 70g, iron powder 90g;
Step 2: by the weighed golden red mountain flour of step 1, Fluorspar Powder, zircon flour, Paris white, brown iron oxide, magnalium conjunction Bronze is mixed to get mixed powder A, and sodium silicate binder is added into mixed powder A and is uniformly mixed, is then placed into heating 650 DEG C of sintering 5h in furnace pulverize, cross 80 mesh screens, obtain mixed powder B;
Step 3: the weighed silicon powder of step 1, manganese powder, chromium powder, nickel powder, molybdenum powder, vanadium powder and iron powder and step 2 being obtained mixed It closes medicinal powder B to be uniformly mixed, is placed in 200 DEG C of drying 3h in drying oven, obtains medicine core powder;
Step 4: by width be 7mm, thickness 0.3mm mild steel steel band be placed on welding wire molding machine put band machine on, lead to Stainless steel belt is rolled into U-type groove by the indent of overmolding machine, the medicine core powder that step 3 obtains is put into U-type groove, medicine core powder The filling rate at end is controlled 16%, then so that U-type groove is rolled closure with molding machine, is carried out being drawn to again with acetone wiped clean straight Diameter is 1.2mm, wipes the greasy dirt on welding wire with the cotton for being moistened with acetone, finally welding wire is straightened through wire drawing machine, disk is at disk, close Package dress, obtains 25CrNiMoV gas shielded type flux-cored wire.
Flux-cored wire made from embodiment 2 is suitable for flux cored wire arc welding (FCAW-S), protective gas CO2.Welding Condition are as follows: welding current 140-180A, weldingvoltage 15.5-24.5V.After tested, the tensile strength of welding point is 756Mpa, yield limit 589Mpa, the contraction percentage of area 20%, ballistic work 55J.Performance meets 25CrNiMoV low-carbon alloy The requirement of steel.
Embodiment 3
Step 1: weighing silicon powder 20g, manganese powder 60g, chromium powder 100g, nickel powder 90g, molybdenum powder 50g, vanadium respectively by mass percentage Powder 40g, golden red mountain flour 80g, Fluorspar Powder 270g, zircon flour 100g, Paris white 50g, brown iron oxide 30g, Al-Mg alloy powder 60g, iron powder 50g;
Step 2: by the weighed golden red mountain flour of step 1, Fluorspar Powder, zircon flour, Paris white, brown iron oxide, magnalium conjunction Bronze is mixed to get mixed powder A, and sodium silicate binder is added into mixed powder A and is uniformly mixed, is then placed into heating 670 DEG C of sintering 6h in furnace pulverize, cross 90 mesh screens, obtain mixed powder B;
Step 3: the weighed silicon powder of step 1, manganese powder, chromium powder, nickel powder, molybdenum powder, vanadium powder and iron powder and step 2 being obtained mixed It closes medicinal powder B to be uniformly mixed, is placed in 300 DEG C of drying 2h in drying oven, obtains medicine core powder;
Step 4: by width be 7mm, thickness 0.3mm mild steel steel band be placed on welding wire molding machine put band machine on, lead to Stainless steel belt is rolled into U-type groove by the indent of overmolding machine, the medicine core powder that step 3 obtains is put into U-type groove, medicine core powder The filling rate at end is controlled 16%, then so that U-type groove is rolled closure with molding machine, is carried out being drawn to again with acetone wiped clean straight Diameter is 1.2mm, wipes the greasy dirt on welding wire with the cotton for being moistened with acetone, finally welding wire is straightened through wire drawing machine, disk is at disk, close Package dress, obtains 25CrNiMoV gas shielded type flux-cored wire.
Flux-cored wire made from embodiment 3 is suitable for flux cored wire arc welding (FCAW-S), protective gas CO2.Welding Condition are as follows: welding current 140-180A, weldingvoltage 15.5-24.5V.After tested, the tensile strength of welding point is 747Mpa, yield limit 576Mpa, the contraction percentage of area 21%, ballistic work 49J.Performance meets 25CrNiMoV low-carbon alloy The requirement of steel.
Embodiment 4
Step 1: weigh silicon powder 30g, manganese powder 30g, chromium powder 110g, nickel powder 100g, molybdenum powder 30g respectively by mass percentage, Vanadium powder 50g, golden red mountain flour 110g, Fluorspar Powder 280g, zircon flour 120g, Paris white 20g, brown iron oxide 80g, almag Powder 20g, iron powder 20g;
Step 2: by the weighed golden red mountain flour of step 1, Fluorspar Powder, zircon flour, Paris white, brown iron oxide, magnalium conjunction Bronze is mixed to get mixed powder A, and sodium silicate binder is added into mixed powder A and is uniformly mixed, is then placed into heating 750 DEG C of sintering 4h in furnace pulverize, cross 110 mesh screens, obtain mixed powder B;
Step 3: the weighed silicon powder of step 1, manganese powder, chromium powder, nickel powder, molybdenum powder, vanadium powder and iron powder and step 2 being obtained mixed It closes medicinal powder B to be uniformly mixed, is placed in 300 DEG C of drying 3h in drying oven, obtains medicine core powder;
Step 4: by width be 7mm, thickness 0.3mm mild steel steel band be placed on welding wire molding machine put band machine on, lead to Stainless steel belt is rolled into U-type groove by the indent of overmolding machine, the medicine core powder that step 3 obtains is put into U-type groove, medicine core powder The filling rate at end is controlled 16%, then so that U-type groove is rolled closure with molding machine, is carried out being drawn to again with acetone wiped clean straight Diameter is 1.2mm, wipes the greasy dirt on welding wire with the cotton for being moistened with acetone, finally welding wire is straightened through wire drawing machine, disk is at disk, close Package dress, obtains 25CrNiMoV gas shielded type flux-cored wire.
Flux-cored wire made from embodiment 4 is suitable for flux cored wire arc welding (FCAW-S), protective gas CO2.Welding Condition are as follows: welding current 140-180A, weldingvoltage 15.5-24.5V.After tested, the tensile strength of welding point is 752Mpa, yield limit 580Mpa, the contraction percentage of area 19%, ballistic work 45J.Performance meets 25CrNiMoV low-carbon alloy The requirement of steel.
Embodiment 5
Step 1: weighing silicon powder 40g, manganese powder 30g, chromium powder 90g, nickel powder 110g, molybdenum powder 30g, vanadium respectively by mass percentage Powder 20g, golden red mountain flour 120g, Fluorspar Powder 300g, zircon flour 60g, Paris white 70g, brown iron oxide 90g, Al-Mg alloy powder 20g, iron powder 20g;
Step 2: by the weighed golden red mountain flour of step 1, Fluorspar Powder, zircon flour, Paris white, brown iron oxide, magnalium conjunction Bronze is mixed to get mixed powder A, and sodium silicate binder is added into mixed powder A and is uniformly mixed, is then placed into heating 700 DEG C of sintering 4h in furnace pulverize, cross 140 mesh screens, obtain mixed powder B;
Step 3: the weighed silicon powder of step 1, manganese powder, chromium powder, nickel powder, molybdenum powder, vanadium powder and iron powder and step 2 being obtained mixed It closes medicinal powder B to be uniformly mixed, is placed in 200 DEG C of drying 2h in drying oven, obtains medicine core powder;
Step 4: by width be 7mm, thickness 0.3mm mild steel steel band be placed on welding wire molding machine put band machine on, lead to Stainless steel belt is rolled into U-type groove by the indent of overmolding machine, the medicine core powder that step 3 obtains is put into U-type groove, medicine core powder The filling rate at end is controlled 16%, then so that U-type groove is rolled closure with molding machine, is carried out being drawn to again with acetone wiped clean straight Diameter is 1.2mm, wipes the greasy dirt on welding wire with the cotton for being moistened with acetone, finally welding wire is straightened through wire drawing machine, disk is at disk, close Package dress, obtains 25CrNiMoV gas shielded type flux-cored wire.
Flux-cored wire made from embodiment 5 is suitable for flux cored wire arc welding (FCAW-S), protective gas CO2.Welding Condition are as follows: welding current 140-180A, weldingvoltage 15.5-24.5V.After tested, the tensile strength of welding point is 761Mpa, yield limit 590Mpa, the contraction percentage of area 18%, ballistic work 53J.Performance meets 25CrNiMoV low-carbon alloy The requirement of steel.
Flux-cored wire of the present invention is compared with stainless steel electrode, solid welding wire, have spatter is few, appearance of weld is beautiful, The advantages of good welds processing performance;It can be used for continuous wire feed automatic welder, there is saving and protection gas and higher production to imitate Rate;Silk generates slag using mineral slag system, protects the molten bath formed when welding, plays the role of gas slag in combination;System Preparation Method is simple, easy to operate, can be used for mass production.

Claims (8)

1.25CrNiMoV gas shielded type flux-cored wire, which is characterized in that including medicine core and weldering skin, wherein medicine core presses quality hundred Divide than composed of the following components: silicon powder 1%-4%, manganese powder 3%-7%, chromium powder 8%-12%, nickel powder 7%-11%, molybdenum powder 3%- 5%, vanadium powder 2%-5%, golden red mountain flour 8%-13%, Fluorspar Powder 25%-30%, zircon flour 6%-13%, Paris white 2%-7%, brown iron oxide 3%-10%, Al-Mg alloy powder 2%-7%, remaining is iron powder, the sum of above constituent mass percentage It is 100%.
2. 25CrNiMoV according to claim 1 gas shielded type flux-cored wire, which is characterized in that the weldering skin is low Carbon steel steel band.
3. 25CrNiMoV according to claim 1 gas shielded type flux-cored wire, which is characterized in that flux-cored wire Chinese medicine The loading of core powder is 15wt%-20wt%.
The preparation method of 4.25CrNiMoV gas shielded type flux-cored wire, which is characterized in that specific step is as follows:
Step 1: weighing silicon powder 1%-4%, manganese powder 3%-7%, chromium powder 8%-12%, nickel powder 7%- respectively by mass percentage 11%, molybdenum powder 3%-5%, vanadium powder 2%-5%, golden red mountain flour 8%-13%, Fluorspar Powder 25%-30%, zircon flour 6%- 13%, Paris white 2%-7%, brown iron oxide 3%-10%, Al-Mg alloy powder 2%-7%, remaining is iron powder, above group of sub-prime Measuring the sum of percentage is 100%;
Step 2: by the weighed golden red mountain flour of step 1, Fluorspar Powder, zircon flour, Paris white, brown iron oxide and Al-Mg alloy powder It is mixed to get mixed powder A, sodium silicate binder is added into mixed powder A and is uniformly mixed, is then placed into heating furnace Sintering, pulverizes, is sieved, obtain mixed powder B;
Step 3: the mixing medicine that the weighed silicon powder of step 1, manganese powder, chromium powder, nickel powder, molybdenum powder, vanadium powder and iron powder and step 2 are obtained Powder B is uniformly mixed, and is placed in drying oven and is dried, obtains medicine core powder;
Step 4: the medicine core powder that step 3 obtains is wrapped in mild steel steel band by flux-cored wire producing machine, and using at Mild steel steel band is closed by type machine, obtains welding wire semi-finished product, carries out drawing again with acetone wiped clean, and being drawn to diameter is 1.2- 1.6mm;
Step 5: after welding wire semi-finished product are through step 4 drawing, wiping the greasy dirt on welding wire with the cotton for being moistened with acetone, obtain 25CrNiMoV gas shielded type flux-cored wire.
5. the 25CrNiMoV according to claim 4 preparation method of gas shielded type flux-cored wire, which is characterized in that institute State in step 2: sintering temperature is 650 DEG C -750 DEG C, sintering time 4-6h, and be sieved granularity 60-140 mesh.
6. the 25CrNiMoV according to claim 4 preparation method of gas shielded type flux-cored wire, which is characterized in that institute State in step 3: drying temperature is 200 DEG C -300 DEG C, drying time 2h-3h.
7. the 25CrNiMoV according to claim 4 preparation method of gas shielded type flux-cored wire, which is characterized in that institute State in step 4: mild steel width of steel band is 7mm, thickness 0.3mm.
8. the 25CrNiMoV according to claim 4 preparation method of gas shielded type flux-cored wire, which is characterized in that institute State in step 4: the loading of medicine core powder is 15wt%-20wt% in welding wire.
CN201811339057.9A 2018-11-12 2018-11-12 25CrNiMoV gas shielded type flux-cored wire and preparation method thereof Pending CN109317862A (en)

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Application publication date: 20190212