CN101224527B - High hardness ferritic stainless steel wearable surfacing flux-cored wire - Google Patents
High hardness ferritic stainless steel wearable surfacing flux-cored wire Download PDFInfo
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- CN101224527B CN101224527B CN2008100306079A CN200810030607A CN101224527B CN 101224527 B CN101224527 B CN 101224527B CN 2008100306079 A CN2008100306079 A CN 2008100306079A CN 200810030607 A CN200810030607 A CN 200810030607A CN 101224527 B CN101224527 B CN 101224527B
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Abstract
The invention provides a high hardness ferrite stainless steel wearable flux-cored wire, which takes a low carbon steel H08A cold rolling thin steel strip as an external wrapper; furthermore, the wrapper is internally provided with a powder core which is composed of graphite, metal and alloy powder; the weight percentages of all ingredients of the powder core are 50-75% of high carbon ferrochrome, 10-16% of ferrovanadium, 6-10% of ferrotitanium, 2-10% of tungsten carbide, 2-3% of nickel powder, 1.5-2.5% of silver graphite, 1-3.5% of boron carbide, 1-2% of aluminium magnesium powder, 0-10% of metallic chromium, and the residual quantity of reduced iron powder; the filling proportion of the powder core is 46-50%; the invention adopts the technical proposal that high-content ferrovanadium and adequate alloy powders such as tungsten carbide and boron carbide, etc. are added into the flux-cored wire, changes the microstructure of the existing ferrite stainless steel flux-cored wire surfacing alloy, overcomes the shortages of poor wearability and ductility, and can be applied to submerged arc bead weld manufacture or repair of the parts which has high requirement of abrasion and the corrosion resistance of the wearable grain.
Description
Technical field
The present invention relates to a kind of replating material, particularly a kind of built-up welding manufacturing or reparation that is used for the parts of abrasive wear resistance and corrosion-resistant requirement is to improve the high hardness ferritic stainless steel wearable surfacing flux-cored wire of service life of equipment.
Background technology
In the welding production operation, the normal component surface of, surface abrasion poor to some surface abrasion resistances or regional area breakage that requires carries out built-up welding manufacturing or reparation.With slag, gas or slag gas discharge protection, at metal levels such as machinery part surface built-up welding one deck are wear-resisting, heat-resisting or corrosion-resistant, give the surface with special performances, this technology be the employings of many enterprises.Used welding material has covered electrode, solid welding wire and flux-cored wire, and wherein the covered electrode built-up welding has advantages such as simple to operate, flexible, and shortcoming is that efficient is low; The solid welding wire rigidity is strong, processing performance good, but the alloying element amount of transition is limited; It is very convenient that the flux-cored wire composition is regulated, and can obtain the hardfacing alloy of required composition as required, and weld with submerged arc or gas shiled mode and to have the deposition efficiency height, is more suitable for producing in enterprise.Still have the problem of wearability deficiency as the used solid core welding wire H25Cr3Mo2MnV of domestic iron and steel enterprises repaired roller, and the domestic and international flux-cored wire alloy system of developing is many based on Cr-Mo, Cr-Mo-V, Cr-Mo-W-V, Cr-Ni-Mo-V, Cr-Mo-W-V-Nb.Wearability and corrosion resistance be rich chromium cast iron preferably all, as supplying with the flux-cored wire form, because the hot input quantity of weld seam is big during submerged arc overlay welding, formed carbide is too thick, the hardfacing alloy poor toughness, even it is adopt preheating and post weld heat treatment etc. to reduce tension type, still easy to crack during submerged arc overlay welding, this makes that the production efficiency of enterprise is lower, and energy resource consumption is big.Most small business adopt its welding rod manual build up welding operation, and production efficiency is low, makes and the rehabilitation cost height.In addition, contain a large amount of corrosive ion (as: Cl in the atmospheric environments such as coastal area, steam power plant and part chemical workshop
-, H
+) and SO
2, SO
3Gas, very big to the corrosion of the wear part on the equipment, though ferritic stainless steel has superior corrosion resistance, wear no resistance.The wearability of hardfacing alloy mainly with its microscopic structure in hard mutually, relevant with quantity as the shape of carbide, toughness then depends on matrix.Vast manufacturing enterprise presses for a kind of flux-cored wire with good wearability, corrosion resistance and crack resistance, with built-up welding manufacturing or the reparation needs that satisfy parts.
Summary of the invention
At above-mentioned situation, the object of the present invention is to provide a kind of high hardness ferritic stainless steel wearable surfacing flux-cored wire, the vanadium iron and the alloy powders such as an amount of tungsten carbide, boron carbide that add high-load in this flux-cored wire, change the microscopic structure of existing ferritic stainless steel hardfacing alloy, make the former net carbide that distributes along crystal boundary become interrupted strip or granular carbide, reach and both have good wearability, corrosion resistance, have good crack resistance again, and need not preheating during built-up welding and also do not crack.
For achieving the above object, a kind of high hardness ferritic stainless steel wearable surfacing flux-cored wire, with the cold rolling thin steel band of mild steel H08A is outer foreskin, and is equipped with graphite, metal and alloy powder formation powder core in foreskin, and the weight percentage scope of described powder core each component is:
High carbon ferro-chrome 50～75%
Vanadium iron 10～16%
Ferrotianium 6～10%
Tungsten carbide 2～10%
Nickel powder 2～3%
Silver strip graphite 1.5～2.5%
Boron carbide 1～3.5%
Al-mg powder 1～2%
Crome metal 0～10%
The reduced iron powder surplus
Powder core filling rate is 46～50%.
Its further optimization measure is:
The weight percentage of each component is in the more excellent composition of described powder core:
High carbon ferro-chrome 50%
Vanadium iron 16%
Ferrotianium 10%
Tungsten carbide 2%
Nickel powder 3%
Silver strip graphite 1.5%
Boron carbide 3.5%
Al-mg powder 2%
Crome metal 3%
The reduced iron powder surplus
Powder core filling rate is 50%.
The weight percentage of each component is in the more excellent composition of described powder core:
High carbon ferro-chrome 60%
Vanadium iron 12%
Ferrotianium 6%
Tungsten carbide 6%
Nickel powder 2.5%
Silver strip graphite 2%
Boron carbide 2%
Al-mg powder 2%
Crome metal 6%
The reduced iron powder surplus
Powder core filling rate is 49%.
The weight percentage of each component is in the more excellent composition of described powder core:
High carbon ferro-chrome 75%
Vanadium iron 10%
Ferrotianium 6%
Tungsten carbide 2%
Nickel powder 2%
Silver strip graphite 2.5%
Boron carbide 1%
Al-mg powder 1%
The reduced iron powder surplus
Powder core filling rate is 46%.
The weight percentage of each component is in the more excellent composition of described powder core:
High carbon ferro-chrome 50%
Vanadium iron 12%
Ferrotianium 8%
Tungsten carbide 4%
Nickel powder 3%
Silver strip graphite 1.5%
Boron carbide 3.5%
Al-mg powder 2%
Crome metal 10%
The reduced iron powder surplus
Powder core filling rate is 47.5%.
The weight percentage of each component is in the more excellent composition of described powder core:
High carbon ferro-chrome 55%
Vanadium iron 10%
Ferrotianium 8%
Tungsten carbide 10%
Nickel powder 2%
Silver strip graphite 2.5%
Boron carbide 2%
Al-mg powder 2%
The reduced iron powder surplus
Powder core filling rate is 50%.
The composition content of powder of described powder core each component requires: the high carbon ferro-chrome chrome content is 63～75%, phosphorus content is 4%, the crome metal chrome content is not less than 99%, the nickel powder nickel content is not less than 99%, the vanadium content 50～52% of vanadium iron, silver strip graphite phosphorus content is not less than 98%, ferrotianium titaniferous amount is 25～35%, and the reduced iron powder iron-holder is not less than 98%.
Whole mistake 60 mesh sieves of the composition powder of described powder core each component.
Alloy powders such as the vanadium iron of the present invention's employing adding high-load in flux-cored wire and an amount of tungsten carbide, boron carbide, utilize a large amount of vanadium carbide disperses to separate out and hard phases strengthening ferritic structure such as tungsten carbide, boron carbide, and the net carbide that original high carbon and chromium stainless flux-cored wire is distributed along crystal boundary becomes the technical scheme of interrupted strip or granular carbide, change the microscopic structure of existing ferritic stainless steel wear-resisting welding wire with flux core hardfacing alloy, overcome its shortcoming that wears no resistance.
Compared with prior art, the present invention has following beneficial effect:
(i) the hardness height of abrasion-proof overlaying welding flux-cored wire deposited metal is 59.5～63.5HRC, has good wearability and corrosion resistance concurrently, has prolonged the service life of workpiece.
(ii) the abrasion-proof overlaying welding flux-cored wire deposited metal has good crack resistance, and not preheating of workpiece does not crack, and energy consumption is little, and is easy and simple to handle, and working condition is good.
(iii) the abrasion-proof overlaying welding flux-cored wire metal has the good removability of slag, and the automatic perk of welding slag comes off, smooth surface, defectives such as no dry slag.
(iv) abrasion-proof overlaying welding flux-cored wire component, its notable feature is not add the components such as molybdenum-iron, ferromanganese and ferro-niobium that other flux-cored wire or coating of build-up welding bar has, but has added a large amount of vanadium iron and an amount of al-mg powder, and with boron carbide (B
4C) but not the ferro-boron form add, vanadium iron is than molybdenum-iron and ferro-niobium low price, economic and practical is strong.
(v) microscopic structure difference, the microscopic structure of abrasion-proof overlaying welding flux-cored wire built-up welding of the present invention is the carbide particle of a large amount of ferrite+distribute along the interrupted strip that distributes of crystal boundary or granular carbide and a large amount of disperses of intracrystalline, but not common high carbon martensite tissue+thick netted or herring-bone form carbide, thereby toughness is better.
The present invention is widely used in the built-up welding manufacturing or the reparation of the parts of requirement abrasive wear resistance and corrosion resistance requirement, as blade of stirrer, grinder hammerhead, excavator, the bucket tooth of dredger and the roll in paper mill etc. of operation under the open-air atmospheres such as coastal area, steam power plant.
The specific embodiment
Embodiment 1
Composition ratio requirement by the powder core during making takes by weighing graphite, metal and alloy powder, whole mistake 60 mesh sieves of all powder.The abrasion-proof overlaying welding flux-cored wire YHZ-1 flux-cored wire forming machine that three English weldering industry Co., Ltd makes in Tianjin prepares moulding.The outer foreskin of abrasion-proof overlaying welding flux-cored wire is H08A cold-rolled strip (width 16mm * thickness 0.36mm, as follows), be equipped with graphite, metal and alloy powder in the foreskin and constitute the powder core, the composition of this powder core (percentage by weight) is: high carbon ferro-chrome 50%, vanadium iron 16%, ferrotianium 10%, tungsten carbide 2%, nickel powder 3%, silver strip graphite 1.5%, boron carbide 3.5%, al-mg powder 2%, crome metal 3%, all the other are reduced iron powder.Powder core filling rate is 50%.Rolling after the each component of powder core stirs is Φ 4.2 flux-cored wires, and the drawing tube reducing is Φ 4.0, Φ 3.8 successively again, until Φ 3.6 welding wires.
On the test plate (panel) (A3 steel) of 90 * 70 * 16mm, abrasion-proof overlaying welding flux-cored wire is with exchanging three layers of submerged arc welding machine MZ-1000 built-up welding, and technological parameter is as shown in table 1, solder flux HJ260, the postwelding welding slag comes off automatically, and face of weld is bright and clean, defectives such as no dry slag, crackle and pore.Is 57 * 25.5 * 6mm wearability sample with bead weld specimen with the line cutting technology processing and preparing, and tests its case hardness with the HR-150 Rockwell apparatus.
Table 1 abrasion-proof overlaying welding flux-cored wire submerged arc overlay welding technological parameter
The wheeled abrasion tester of MLS-23 type damp sand rubber is adopted in abrasion test, experimental condition is as follows: rubber wheel diameter 178mm, Shao Er hardness 60, institute adds the heavy 2.5Kg of counterweight, rubber wheel rotating speed 240r/min, and the mortar ratio is that 1500g quartz sand (40～60 order) is joined 1000g water.Sample elder generation pre-grinding 1000 is changeed, and rinses well, dries up, and claims initial weight M
0, cleaning dried up after formal test 1000 was changeed then, and M weighs
1, (M
0-M
1) be the sample absolute weight loss Δ M that weares and teares.Being standard specimen to example 1 bead weld specimen of having a competition, the absolute weight loss of the absolute weight loss/sample of relative wear coefficient ε=standard specimen, result of the test sees Table 2.
Embodiment 2
Composition ratio requirement by the powder core during making takes by weighing graphite, metal and alloy powder, whole mistake 60 mesh sieves of all powder.The abrasion-proof overlaying welding flux-cored wire YHZ-1 flux-cored wire forming machine that three English weldering industry Co., Ltd makes in Tianjin prepares moulding.The outer foreskin of abrasion-proof overlaying welding flux-cored wire is H08A cold-rolled strip (16mm * 0.36mm), be equipped with graphite, metal and alloy powder in the foreskin and constitute the powder core, the composition of this powder core (percentage by weight) is: high carbon ferro-chrome 60%, vanadium iron 12%, ferrotianium 6%, tungsten carbide 6%, nickel powder 2.5%, silver strip graphite 2%, boron carbide 2%, al-mg powder 2%, crome metal 6%, all the other are reduced iron powder.Powder core filling rate is 49%.Rolling after the each component of powder core stirs is Φ 4.2 flux-cored wires, and the drawing tube reducing is Φ 4.0, Φ 3.8 successively again, until Φ 3.6 welding wires.
All the other contents are with embodiment 1.
Embodiment 3
Composition ratio requirement by the powder core during making takes by weighing graphite, metal and alloy powder, whole mistake 60 mesh sieves of all powder.The flux-cored wire YHZ-1 flux-cored wire forming machine that three English weldering industry Co., Ltd makes in Tianjin prepares moulding.The outer foreskin of flux-cored wire is H08A cold-rolled strip (16mm * 0.36mm), be equipped with graphite, metal and alloy powder in the foreskin and constitute the powder core, the composition of this powder core (percentage by weight) is: high carbon ferro-chrome 75%, vanadium iron 10%, ferrotianium 6%, tungsten carbide 2%, nickel powder 2%, silver strip graphite 2.5%, boron carbide 1%, al-mg powder 1%, all the other are reduced iron powder.Powder core filling rate is 46%.Rolling after the each component of powder core stirs is Φ 4.2 flux-cored wires, and the drawing tube reducing is Φ 4.0, Φ 3.8 successively again, until Φ 3.6 welding wires.
All the other contents are with embodiment 1.
Embodiment 4
Composition ratio requirement by the powder core during making takes by weighing graphite, metal and alloy powder, whole mistake 60 mesh sieves of all powder.The flux-cored wire YHZ-1 flux-cored wire forming machine that three English weldering industry Co., Ltd makes in Tianjin prepares moulding.The outer foreskin of flux-cored wire is H08A cold-rolled strip (16mm * 0.5mm), be equipped with graphite, metal and alloy powder in the foreskin and constitute the powder core, the composition of this powder core (percentage by weight) is: high carbon ferro-chrome 50%, vanadium iron 12%, ferrotianium 8%, tungsten carbide 4%, nickel powder 3%, silver strip graphite 1.5%, boron carbide 3.5%, al-mg powder 2%, crome metal 10%, all the other are reduced iron powder.Powder core filling rate is 47.5%.Rolling after the each component of powder core stirs is Φ 4.2 flux-cored wires, and the drawing tube reducing is Φ 4.0, Φ 3.8 successively again, until Φ 3.6 welding wires.
All the other contents are with embodiment 1.
Embodiment 5
Composition ratio requirement by the powder core during making takes by weighing graphite, metal and alloy powder, whole mistake 60 mesh sieves of all powder.The flux-cored wire YHZ-1 flux-cored wire forming machine that three English weldering industry Co., Ltd makes in Tianjin prepares moulding.The outer foreskin of flux-cored wire is a H08A cold-rolled strip (16 * 0.4mm), be equipped with graphite, metal and alloy powder in the foreskin and constitute the powder core, the composition of this powder core (percentage by weight) is: high carbon ferro-chrome 55%, vanadium iron 10%, ferrotianium 8%, tungsten carbide 10%, nickel powder 2%, silver strip graphite 2.5%, boron carbide 2%, al-mg powder 2%, all the other are reduced iron powder.Powder core filling rate is 50%.Rolling after the each component of powder core stirs is Φ 4.2 flux-cored wires, and the drawing tube reducing is Φ 4.0, Φ 3.8 successively again, until Φ 3.6 welding wires.
All the other contents are with embodiment 1.
To the example 1 of having a competition
Adopt commercially available solid core welding wire H25Cr3Mo2MnV (Φ 4.0) on the test plate (panel) (A3 steel) of 90 * 70 * 16mm, with exchanging three layers of submerged arc welding machine MZ-1000 built-up welding, technological parameter is as shown in table 1, solder flux HJ260.
All the other contents are with embodiment 1.
The abrasive wear resistance performance of table 2 embodiment 1 hardfacing alloy
As can be seen from Table 2, the relative wear coefficient ε of high hardness ferritic stainless steel wearable surfacing flux-cored wire of the present invention is 27～36.8 times of solid core welding wire H25Cr3Mo2MnV, has good abrasive wear resistance performance.In addition, average chrome content 〉=12.5% that the flux-cored wire built-up welding is deposited has good anti-corrosion, and along with the increase of chrome content in the flux-cored wire, the corrosion resistance of built-up welding deposited metal increases, and it is stable that wearability keeps.
For guaranteeing the performance of high hardness ferritic stainless steel wearable surfacing flux-cored wire of the present invention, the composition content of powder of welding wire powder core each component requires: the high carbon ferro-chrome chrome content is 63～75%, phosphorus content is 4%, the crome metal chrome content is not less than 99%, the nickel powder nickel content is not less than 99%, the vanadium content 50～52% of vanadium iron, silver strip graphite phosphorus content is not less than 98%, and ferrotianium titaniferous amount is 25～35%, and the reduced iron powder iron-holder is not less than 98%.
Claims (7)
1. high hardness ferritic stainless steel wearable surfacing flux-cored wire, it is characterized in that with the cold rolling thin steel band of mild steel H08A be outer foreskin, and be equipped with graphite, metal and alloy powder and constitute the powder core in foreskin, the weight percentage scope of described powder core each component is:
Chrome content be 63～75% and phosphorus content be 4% high carbon ferro-chrome 50～75%
Vanadium content is 50～52% vanadium iron 10～16%
The titaniferous amount is 25～35% ferrotianium 6～10%
Tungsten carbide 2～10%
Nickel content is not less than 99% nickel powder 2～3%
Phosphorus content is not less than 98% silver strip graphite 1.5～2.5%
Boron carbide 1～3.5%
Al-mg powder 1～2%
Chrome content is not less than 99% crome metal 0～10%
Iron-holder is not less than 98% reduced iron powder surplus
Powder core filling rate is 46～50%.
2. high hardness ferritic stainless steel wearable surfacing flux-cored wire according to claim 1 is characterized in that the weight percentage of each component in the described powder core composition is:
Chrome content be 63～75% and phosphorus content be 4% high carbon ferro-chrome 50%
Vanadium content is 50～52% vanadium iron 16%
The titaniferous amount is 25～35% ferrotianium 10%
Tungsten carbide 2%
Nickel content is not less than 99% nickel powder 3%
Phosphorus content is not less than 98% silver strip graphite 1.5%
Boron carbide 3.5%
Al-mg powder 2%
Chrome content is not less than 99% crome metal 3%
Iron-holder is not less than 98% reduced iron powder surplus
Powder core filling rate is 50%.
3. high hardness ferritic stainless steel wearable surfacing flux-cored wire according to claim 1 is characterized in that the weight percentage of each component in the described powder core composition is:
Chrome content be 63～75% and phosphorus content be 4% high carbon ferro-chrome 60%
Vanadium content is 50～52% vanadium iron 12%
The titaniferous amount is 25～35% ferrotianium 6%
Tungsten carbide 6%
Nickel content is not less than 99% nickel powder 2.5%
Phosphorus content is not less than 98% silver strip graphite 2%
Boron carbide 2%
Al-mg powder 2%
Chrome content is not less than 99% crome metal 6%
Iron-holder is not less than 98% reduced iron powder surplus
Powder core filling rate is 49%.
4. high hardness ferritic stainless steel wearable surfacing flux-cored wire according to claim 1 is characterized in that the weight percentage of each component in the described powder core composition is:
Chrome content be 63～75% and phosphorus content be 4% high carbon ferro-chrome 75%
Vanadium content is 50～52% vanadium iron 10%
The titaniferous amount is 25～35% ferrotianium 6%
Tungsten carbide 2%
Nickel content is not less than 99% nickel powder 2%
Phosphorus content is not less than 98% silver strip graphite 2.5%
Boron carbide 1%
Al-mg powder 1%
Iron-holder is not less than 98% reduced iron powder surplus
Powder core filling rate is 46%.
5. high hardness ferritic stainless steel wearable surfacing flux-cored wire according to claim 1 is characterized in that the weight percentage of each component in the described powder core composition is:
Chrome content be 63～75% and phosphorus content be 4% high carbon ferro-chrome 50%
Vanadium content is 50～52% vanadium iron 12%
The titaniferous amount is 25～35% ferrotianium 8%
Tungsten carbide 4%
Nickel content is not less than 99% nickel powder 3%
Phosphorus content is not less than 98% silver strip graphite 1.5%
Boron carbide 3.5%
Al-mg powder 2%
Chrome content is not less than 99% crome metal 10%
Iron-holder is not less than 98% reduced iron powder surplus
Powder core filling rate is 47.5%.
6. high hardness ferritic stainless steel wearable surfacing flux-cored wire according to claim 1 is characterized in that the weight percentage of each component in the described powder core composition is:
Chrome content be 63～75% and phosphorus content be 4% high carbon ferro-chrome 55%
Vanadium content is 50～52% vanadium iron 10%
The titaniferous amount is 25～35% ferrotianium 8%
Tungsten carbide 10%
Nickel content is not less than 99% nickel powder 2%
Phosphorus content is not less than 98% silver strip graphite 2.5%
Boron carbide 2%
Al-mg powder 2%
Iron-holder is not less than 98% reduced iron powder surplus
Powder core filling rate is 50%.
7. according to claim 1 or 2 or 3 or 4 or 5 or 6 described high hardness ferritic stainless steel wearable surfacing flux-cored wires, it is characterized in that whole mistake 60 mesh sieves of composition powder of described powder core each component.
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| CN2008100306079A CN101224527B (en) | 2008-02-04 | 2008-02-04 | High hardness ferritic stainless steel wearable surfacing flux-cored wire |
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| CN2008100306079A CN101224527B (en) | 2008-02-04 | 2008-02-04 | High hardness ferritic stainless steel wearable surfacing flux-cored wire |
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| CN101224527B true CN101224527B (en) | 2010-09-29 |
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