CN102699579A - Flux-cored wire for gas-shielded welding of high-chromium-nickel all-austenitic stainless steel - Google Patents
Flux-cored wire for gas-shielded welding of high-chromium-nickel all-austenitic stainless steel Download PDFInfo
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Abstract
The invention provides a flux-cored wire for the all-position welding of an austenitic stainless steel, comprising flux powder and a stainless steel band for external use, wherein the weight of a flux core accounts for 28.0-30.0 percent of the total weight of the flux-cored wire, the flux core contains the following components accounting for the flux core in percentage by weight: 25.0%-28.0% of metallic chromium powder, 29.0%-32.0% of metallic nickel powder, 4.0%-5.0% of electrolytic metallic manganese, 2.0%-4.0% of high carbon ferro-chrome, 18.0%-20.0% of rutiles, 1.0%-2.0% of quartz, 1.0%-2.0% of zircon sands, 1.0%-3.0% of feldspars, 0.5%-1.0% of fluorspars, 0.5%-1.5% of calcium carbonate, 0.5%-1.5% of barium carbonate, and the balance of ferrous powder. The flux-cored wire has good welding process property and is suitable for the all-position gas-shielded welding of a high-chromium-nickel all-austenitic stainless steel.
Description
Technical field
The invention belongs to the welding field of Materials Processing Engineering, especially, relate to a kind of high chromium nickel full austenite stainless steel gas protection flux-cored wire used for welding.
Background technology
The microscopic structure of tradition stainless steel (like 304 stainless steels) is made up of austenite and little ferrite, and the existence of little ferrite improves the cracking resistance of austenitic stainless steel.But for for the stainless steel of high temperature or use under harsh etching condition, ferritic existence can damage stainless high-temperature behavior and decay resistance on the contrary.Therefore, for high temperature or harsh etching condition working condition, need to use full austenite stainless steel, the stainless steel that promptly constitutes by single austenite structure.
The most typical full austenite stainless steel is Cr25Ni20 alloy system 310 stainless steels, and chromium content is 24.0～26.0%, and nickel content is 19.0～22.0%, is the austenitic stainless steel of high chromium nickel.At present; Mainly with the welding rod welding, welding rod is interrupted welding to high chromium nickel full austenite stainless steel, and stainless steel has bigger resistivity; The rubescent welding rod joint length that requires of afterbody is short easily; Can cause because of discard electrode produces bigger waste when therefore adopting the welding rod welding, particularly for the welding rod of high chromium nickel content, the waste of its alloying element is even more serious.
For the welding rod welding, welding wire is continuous welding.But because the composition of solid welding wire is subject to iron and steel enterprise's wire rod kind, and its welding technological properties is relatively poor, is difficult to satisfy high request, high-quality stainless steel welding.Therefore, exploitation is applicable to that the gas-shielded flux-cored wire of high chromium nickel full austenite stainless steel welding has remarkable economic efficiency, does not have relevant with it patent or bibliographical information at present as yet.
The present invention provides a kind of high chromium nickel full austenite stainless steel gas protection flux-cored wire used for welding; The technological difficulties that overcome the solder wire formula exploitation and manufactured; Welding wire has good welding technological properties and mechanical property, is applicable to the gas shiled welding of the stainless full position of high chromium nickel full austenite.
Summary of the invention
The object of the present invention is to provide a kind of flux-cored wire that is used for high chromium nickel full austenite stainless steel gas protection welding usefulness, this welding wire has good welding technological properties, is applicable to the gas shiled welding of the stainless full position of high chromium nickel full austenite.
To achieve these goals, the present invention adopts following technical scheme:
A kind of high chromium nickel full austenite stainless steel flux-cored wire used for welding is made up of medicinal powder and external application stainless steel band, and wherein, said medicine core accounts for 28.0～30.0% of welding wire gross weight; The percentage by weight of each ingredients constitute medicine core of its Chinese medicine core is: hafnium metal powfer: 25.0～28.0%, and metal nickel powder: 29.0～32.0%, electrolytic manganese metal: 4.0～5.0%; High carbon ferro-chrome: 2.0～4.0%, rutile: 18.0～20.0%, quartz: 1.0～2.0%; Zircon sand: 1.0～2.0%, feldspar: 1.0～3.0%, fluorite: 0.5～1.0%; Brium carbonate: 0.5～1.5%, calcium carbonate: 0.5～1.5%, all the other are iron powder.
Aforesaid flux-cored wire, preferably, said external application stainless steel band is an austenic stainless steel belt 309.
Aforesaid flux-cored wire, preferably, the sulfur content of said external application stainless steel band and each component of medicinal powder all is not higher than 0.010%, and phosphorus content all is not higher than 0.025%.
Aforesaid flux-cored wire, preferably, the content summation of brium carbonate and calcium carbonate is no more than 2.5% in the said medicinal powder.
Aforesaid flux-cored wire, preferably, the phosphorus content of the deposited metal of said flux-cored wire is not less than 0.08%.
Aforesaid flux-cored wire, preferably, the diameter of said flux-cored wire is 1.2mm.
Aforesaid flux-cored wire, its preparation methods steps is following:
(1) configures medicine core powder according to said medicine core composition, 309 austenic stainless steel belts are rolled into U-shaped, in U-lag, add the medicine core powder that accounts for this welding wire gross weight 28.0～30.0%;
(2) U-lag is healed up after, be rolled moulding, continuous drawing tube reducing successively and handle, obtain welding wire;
(3) welding wire surface is carried out mechanical chipping, obtain the final products of said high chromium nickel full austenite stainless steel gas protection flux-cored wire used for welding.
Beneficial effect of the present invention is:
For the stainless flux-cored wire of manufacturing high chromium nickel; If adopting 304 stainless steel bands commonly used is welding wire external application steel band; The composition that guarantees welding wire reaches composition that AWS standard or GB require (like chromium content 25.0～28.0%; Nickel content 20.0～22.5%), need the powder coefficient (being the percentage that welding wire medicinal powder accounts for welding wire weight) that add of welding wire be increased to more than 40%, then need increase the external application width of steel band simultaneously, reduce thickness of strips.When adding the powder coefficient and be higher than 40%, technology difficulty such as rolling, the drawing of production gas shiled flux-cored wire used for welding (gage of wire is 1.2mm), tube reducing are very big, can not realize producing.It is welding wire external application steel band that the present invention adopts 309 stainless steel bands of higher chromium nickel content, increases the alloying element amount of transition of steel band butt welded seam deposited metal, welding wire is added the powder coefficient reduce to below 30%, reaches the production permit scope, to guarantee the processing characteristics of welding wire.
As far as high chromium nickel full austenite stainless steel gas protection flux-cored wire material; Its chromium nickel equivalent ratio is about 1.2 (less than 1.5), does not contain ferrite in the microscopic structure, lack to stop fire check to produce and expansion second mutually; So heat resistanceheat resistant poor performance of type welding wire; Even adopt little heat input welding, the intergranular liquid film that accumulation of impurities forms still is prone to form fire check, hot cracking tendency highly significant.
For reducing its hot tearing sensitiveness, the present invention solves through following two kinds of approach: the one, as second phase in the microscopic structure, under the prerequisite that does not reduce the welding wire high-temperature behavior, suitably increase the content of carbide second phase with carbide; The 2nd, through control welding stick original material material sulphur, phosphorus impurities content, and combine metallurgical method, reduce the impurity content of welding wire deposited metal.
In welding wire medicinal powder, suitably add high carbon ferro-chrome, increase the carbon content of deposited metal, make carbon combine to form granular chromium carbide with the chromium of deposited metal, produce and expansion, reduce the hot tearing sensitiveness of welding wire as the second phase resistance crack arrest line.The present invention requires the phosphorus content of welding wire deposited metal to be not less than 0.08%.If be lower than at 0.08% o'clock, the tearing tendency of deposited metal is remarkable.For example when the deposited metal tension test, crackle is very easily expanded, and causes the pull-rod early fracture, and the tensile strength of deposited metal and percentage elongation can not reach the index of AWS standard or GB requirement.
As far as fully austenitic structure's weld seam, hot cracking tendency is far above the stainless steel material (like 304 stainless steels) of other austenites and little ferrite formation.Under the identical condition of weld seam impurity content (sulphur, phosphorus), the full austenite stainless steel is easy of crack more.For reducing hot cracking tendency, need sulphur, phosphorus content in the control welding wire deposited metal.The present invention at first controls the welding stick original material material, and promptly sulphur, the phosphorus content of external application steel band and each component of medicinal powder reduce the transition of raw-material impurity to deposited metal.The present invention requires the sulfur content of welding wire external application steel band and medicinal powder not to be higher than 0.01%, and phosphorus content is not higher than 0.025%; Next the present invention is directed to metallurgical dephosphorization situation of difficult, adopts calcium oxide and barium monoxide co-oxidation dephosphorization method.Brium carbonate and calcium carbonate decompose back formation calcium oxide and barium monoxide in the welding wire medicinal powder, and the phosphorous oxide that generates with phosphorus oxidation combines, and generate barium phosphate and synthos and carry out the transition in the slag, reach the purpose of metallurgical dephosphorization, and its effect is better than the independent dephosphorization of calcium oxide.Through above-mentioned measure, the sulfur content of welding wire deposited metal according to the invention is controlled at below 0.008%, and phosphorus content is controlled at below 0.020%, reaches the low impurity content level.But calcium carbonate and brium carbonate addition in the welding wire medicinal powder are in case above 2.5%, can cause the spatter increase, the deterioration welding technological properties.
Welding wire of the present invention is applicable to 100%CO
2Gas shielded arc welding; Welding technological properties is good; Quality of weld seam molding is good; Metallurgical imperfections such as flawless, pore, slag inclusion, each item performance of welding wire deposited metal all meet AWS standard (AWS A5.22 Specification for Stainless Steel Flux Cored and Metal Cored Welding Electrodes and Rods) and GB requires (GB/T17853 stainless flux-cored wire), are applicable to the stainless all-position welding of high chromium nickel full austenite.
The specific embodiment
The invention provides a kind of high chromium nickel full austenite stainless steel gas protection flux-cored wire used for welding, it is made up of external application steel band and welding wire medicine core wherein, and its specific embodiment is following:
Said external application steel band is an austenitic stainless steel strip 309.
The composition of said welding wire medicine core and the function of each component are following:
Hafnium metal powfer: 25.0～28.0%, metal nickel powder: 29.0～32.0%, electrolytic manganese metal: 4.0～5.0%; High carbon ferro-chrome: 2.0～4.0%, rutile: 18.0～20.0%, quartz: 1.0～2.0%; Zircon sand: 1.0～2.0%, feldspar: 1.0～3.0%, fluorite: 0.5～1.0%; Brium carbonate: 0.5～1.5%, calcium carbonate: 0.5～1.5%, all the other are iron powder.
Hafnium metal powfer: transition chromium element in the welding wire deposited metal, its weight percentage is (accounting for the weight percentage of medicine core, as follows) 25.0～28.0%.
Metal nickel powder: transition nickel element in the welding wire deposited metal, its weight percentage are 29.0～32.0%.
Electrolytic manganese metal: transition manganese element in the welding wire deposited metal, and play deoxidation, desulfidation, and manganese is austenizer simultaneously, its weight percentage is 4.0～5.0%.
High carbon ferro-chrome: transition chromium element and carbon in the welding wire deposited metal, can improve the hot-cracking resistance of welding wire deposited metal, its weight percentage is 2.0～4.0%.
Rutile: main slag former, can improve the removability of slag and the forming quality of weld metal, an amount of rutile can improve arc stability, but addition too much can reduce the electric arc quality on the contrary, and its weight percentage is 18.0～20.0%.
Quartzy: main slag former, the acidity of increase slag, the viscosity and the oxidisability of adjustment slag, but addition too much can increase oxide inclusions amount in the deposited metal, reduces quality of weld seam molding, and its weight percentage is 1.0～2.0%.
Zircon sand: main slag former, the physical and chemical performance of adjustment slag improves the removability of slag of weld metal, improves fusing coefficient, and its weight percentage is 1.0～2.0%;
Feldspar: be used for slag making, the physical and chemical performance of adjustment slag, the effect of stable arc, refinement molten drop.But the excessive acidity that then can improve slag of addition causes that the silica slag inclusion increases in the weld metal, and increases the weld porosity tendency, and the optimum weight percentage composition is 1.0～3.0%;
Fluorite: dehydrogenation, reduce weld metal pore tendency, simultaneously as the flux of metallurgical dephosphorisation reaction, promote the carrying out of dephosphorisation reaction, its weight percentage is 0.5～1.0%.
Brium carbonate: decompose the barium monoxide that generates in the welding process, decompose the calcium oxide that generates with calcium carbonate and participate in dephosphorisation reaction jointly, improve dephosphorization effect; Brium carbonate can improve the anti-pore ability of weld metal simultaneously, and its weight percentage is 0.5～1.5%.
Calcium carbonate: decompose the calcium oxide of producing in the welding process, decompose the barium monoxide that generates with brium carbonate and participate in dephosphorisation reaction jointly, improve dephosphorization effect; Calcium carbonate can improve the anti-pore ability of weld metal simultaneously, and its weight percentage is 0.5～1.5%.
All the other are iron powder.
Following steps are adopted in the manufacturing of austenitic stainless steel flux-cored wire used for welding of the present invention:
(1) with thickness 0.4mm, the austenic stainless steel belt 309 of width 10mm rolls into U-shaped, in U-lag, adds the medicinal powder that accounts for welding wire gross weight 28.0～30.0% of the present invention;
(2) U-lag is healed up after, through roll forming and multiple tracks drawing tube reducing, finally reach finished diameter, the finished diameter specification is 1.2mm.
(3) welding wire surface is carried out mechanical chipping, obtain final products.
Embodiment 1
Selecting thickness 0.4mm, width 10mm, weight for use is 309 austenic stainless steel belts of 2571g, and it is rolled into the U type, with the 250g hafnium metal powfer, and 290g metal nickel powder, 40g electrolytic manganese metal; The 20g high carbon ferro-chrome, the 180g rutile, 10g is quartzy, 10g zircon sand, 10g feldspar; The 5g fluorite, 5g brium carbonate, 5g calcium carbonate, 175g iron powder, 1000g medicinal powder altogether; Mixed evenly back adds in the U type groove, and filling rate is 28%, and through rolling tube reducing repeatedly, the final finished gage of wire is 1.2mm after healing up.
Embodiment 2
Selecting thickness 0.4mm, width 10mm, weight for use is 309 austenic stainless steel belts of 2571g, and it is rolled into the U type, with the 280g hafnium metal powfer, and 320g metal nickel powder, 50g electrolytic manganese metal; The 40g high carbon ferro-chrome, the 200g rutile, 20g is quartzy, 20g zircon sand, 30g feldspar; The 10g fluorite, 15g brium carbonate, 10g calcium carbonate, 5g iron powder, 1000g medicinal powder altogether; Mixed evenly back adds in the U type groove, and filling rate is 28%, and through rolling tube reducing repeatedly, the final finished gage of wire is 1.2mm after healing up.
Embodiment 3
Selecting thickness 0.4mm, width 10mm, weight for use is 309 austenic stainless steel belts of 3448g, and it is rolled into the U type, with the 270g hafnium metal powfer, and 300g metal nickel powder, 45g electrolytic manganese metal; The 30g high carbon ferro-chrome, the 190g rutile, 15g is quartzy, 15g zircon sand, 30g feldspar; The 8g fluorite, 8g brium carbonate, 10g calcium carbonate, 79g iron powder, 1000g medicinal powder altogether; Mixed evenly back adds in the U type groove, and filling rate is 29%, and through rolling tube reducing repeatedly, the final finished gage of wire is 1.2mm after healing up.
Embodiment 4
Selecting thickness 0.4mm, width 10mm, weight for use is 309 austenic stainless steel belts of 3448g, and it is rolled into the U type, with the 260g hafnium metal powfer, and 310g metal nickel powder, 45g electrolytic manganese metal; The 35g high carbon ferro-chrome, the 195g rutile, 18g is quartzy, 18g zircon sand, 25g feldspar; The 6g fluorite, 10g brium carbonate, 10g calcium carbonate, 68g iron powder, 1000g medicinal powder altogether; Mixed evenly back adds in the U type groove, and filling rate is 29%, and through rolling tube reducing repeatedly, the final finished gage of wire is 1.2mm after healing up.
Embodiment 5
Selecting thickness 0.4mm, width 10mm, weight for use is 309 austenic stainless steel belts of 2333g, and it is rolled into the U type, with the 250g hafnium metal powfer, and 290g metal nickel powder, 40g electrolytic manganese metal; The 20g high carbon ferro-chrome, the 180g rutile, 10g is quartzy, 10g zircon sand, 10g feldspar; The 5g fluorite, 5g brium carbonate, 5g calcium carbonate, 175g iron powder, 1000g medicinal powder altogether; Mixed evenly back adds in the U type groove, and filling rate is 30%, and through rolling tube reducing repeatedly, the final finished gage of wire is 1.2mm after healing up.
Embodiment 6
Selecting thickness 0.4mm, width 10mm, weight for use is 309 austenic stainless steel belts of 2333g, and it is rolled into the U type, with the 280g hafnium metal powfer, and 320g metal nickel powder, 50g electrolytic manganese metal; The 40g high carbon ferro-chrome, the 200g rutile, 20g is quartzy, 20g zircon sand, 30g feldspar; The 10g fluorite, 15g brium carbonate, 10g calcium carbonate, 5g iron powder, 1000g medicinal powder altogether; Mixed evenly back adds in the U type groove, and filling rate is 30%, and through rolling tube reducing repeatedly, the final finished gage of wire is 1.2mm after healing up.
Comparative Examples 1
Selecting thickness 0.4mm, width 10mm, weight for use is 309 austenic stainless steel belts of 2571g, and it is rolled into the U type, with the 250g hafnium metal powfer, and 290g metal nickel powder, 40g electrolytic manganese metal; The 180g rutile, 10g is quartzy, 10g zircon sand, 10g feldspar, 5g fluorite; The 7g brium carbonate, 8g calcium carbonate, 190g iron powder, 1000g medicinal powder altogether; Mixed evenly back adds in the U type groove, and filling rate is 28%, and through rolling tube reducing repeatedly, the final finished gage of wire is 1.2mm after healing up.
Comparative Examples 2
Selecting thickness 0.4mm, width 10mm, weight for use is 309 austenic stainless steel belts of 3448g, and it is rolled into the U type, with the 260g hafnium metal powfer, and 310g metal nickel powder, 45g electrolytic manganese metal; The 30g high carbon ferro-chrome, the 190g rutile, 18g is quartzy, 18g zircon sand, 25g feldspar; The 6g fluorite, 20g brium carbonate, 15g calcium carbonate, 63g iron powder, 1000g medicinal powder altogether; Mixed evenly back adds in the U type groove, and filling rate is 29%, and through rolling tube reducing repeatedly, the final finished gage of wire is 1.2mm after healing up.
Comparative Examples 3
Selecting thickness 0.4mm, width 10mm, weight for use is 309 austenic stainless steel belts of 2333g, and it is rolled into the U type, with the 270g hafnium metal powfer, and 300g metal nickel powder, 50g electrolytic manganese metal; The 30g high carbon ferro-chrome, the 190g rutile, 20g is quartzy, the 20g zircon sand; The 20g feldspar, 8g fluorite, 92g iron powder, 1000g medicinal powder altogether; Mixed evenly back adds in the U type groove, and filling rate is 30%, and through rolling tube reducing repeatedly, the final finished gage of wire is 1.2mm after healing up.
Evaluation to each embodiment and Comparative Examples performance:
The processing performance of the high chromium nickel all steel gas shiled flux-cored wire used for welding that embodiment and Comparative Examples are related to is estimated, and crack resistance, impurity content and tensile strength and the percentage elongation of examination welding wire deposited metal.The effect comparison of each embodiment and Comparative Examples is as shown in table 1.Visible by table 1, embodiments of the invention 1-6 is superior to Comparative Examples 1-3 comprehensively on each item indexs such as crack resistance, impurity content and the tensile strength of the processing performance of flux-cored wire, welding wire deposited metal and percentage elongation.
Claims (6)
1. one kind high chromium nickel full austenite stainless steel flux-cored wire used for welding is made up of medicinal powder and external application stainless steel band, it is characterized in that said medicine core accounts for 28.0～30.0% of welding wire gross weight; The percentage by weight of each ingredients constitute medicine core of its Chinese medicine core is: hafnium metal powfer: 25.0～28.0%, and metal nickel powder: 29.0～32.0%, electrolytic manganese metal: 4.0～5.0%; High carbon ferro-chrome: 2.0～4.0%, rutile: 18.0～20.0%, quartz: 1.0～2.0%; Zircon sand: 1.0～2.0%, feldspar: 1.0～3.0%, fluorite: 0.5～1.0%; Brium carbonate: 0.5～1.5%, calcium carbonate: 0.5～1.5%, all the other are iron powder.
2. flux-cored wire as claimed in claim 1 is characterized in that, said external application stainless steel band is an austenic stainless steel belt 309.
3. according to claim 1 or claim 2 flux-cored wire is characterized in that the sulfur content of said external application stainless steel band and each component of medicinal powder all is not higher than 0.010%, and phosphorus content all is not higher than 0.025%.
4. according to claim 1 or claim 2 flux-cored wire is characterized in that the content summation of brium carbonate and calcium carbonate is no more than 2.5% in the said medicinal powder.
5. according to claim 1 or claim 2 flux-cored wire is characterized in that the phosphorus content of the deposited metal of said flux-cored wire is not less than 0.08%.
6. according to claim 1 or claim 2 flux-cored wire is characterized in that the diameter of said flux-cored wire is 1.2mm.
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| CN102909490A (en) * | 2012-11-09 | 2013-02-06 | 高金菊 | Flux-cored wire for welding austenitic stainless steel |
| CN103521951A (en) * | 2013-11-04 | 2014-01-22 | 北京金威焊材有限公司 | Flux-cored wire for stainless steel welding |
| CN104588915A (en) * | 2014-12-09 | 2015-05-06 | 天津大桥金属焊丝有限公司 | Gas shield build-up welding flux-cored wire for hot-forging die |
| CN105108382A (en) * | 2015-09-16 | 2015-12-02 | 安徽克里斯特新材料有限公司 | Novel flux-cored wire manufacturing method and flux-cored wire produced through novel flux-cored wire manufacturing method |
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