CN107498209A - 18Ni250 stainless steels Self-protecting flux-cored wire and preparation method thereof - Google Patents
18Ni250 stainless steels Self-protecting flux-cored wire and preparation method thereof Download PDFInfo
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- CN107498209A CN107498209A CN201710640005.4A CN201710640005A CN107498209A CN 107498209 A CN107498209 A CN 107498209A CN 201710640005 A CN201710640005 A CN 201710640005A CN 107498209 A CN107498209 A CN 107498209A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention discloses 18Ni250 martensite aged stainless steels Self-protecting flux-cored wire, including medicine core and weldering skin, wherein medicine core it is composed of the following components by mass percentage：Cobalt powder 12.0% 14.0%, nickel powder 9.0% 12.0%, molybdenum powder 8.0% 10.0%, it is electrolysed aluminium powder 0.5% 0.1%, golden red stone flour 20.0% 23.0%, zircon flour 5% 7%, barium fluoride powder 22% 25%, Paris white 2% 3%, lithium carbonate powder 2% 3%, brown iron oxide 5% 7%, alumina powder 2% 3%, magnesia powder 2% 3%, remaining is iron powder, and above constituent mass percentage sum is 100%.The present invention has also opened its preparation method.Flux-cored wire appearance of weld of the present invention is attractive in appearance, can obtain martensitic stain less steel seam organization, and welding point has excellent mechanical property and corrosion resistance.
Description
Technical field
The invention belongs to Metal Material Welding technical field, and in particular to 18Ni250 stainless steels are welded with Self-protecting medicine core
Silk, the invention further relates to the preparation method of the welding wire.
Background technology
Martensite refers to that austenite by diffusionless transformation is carbon in iron the body-centred cubic metastable phase that is transformed into
Oversaturated interstitial solid solution, its original structure are martensite, and the iron-nickel alloy of reinforcing is produced by timeliness.With other steel grades
Difference, martensite aged stainless steel are a kind of to be obtained by low-carbon martensite phase transformation, the superposition of two kinds of strengthening effects of ageing strengthening
A kind of superhigh strength stainless steel.This steel not only possesses all advantages of Maraging steel, and possesses other martensites
Corrosion resistance characteristic not available for aged steel, and improve some performances of precipitation-hardening stainless steel.So this martensite ag(e)ing
Stainless steel progressively replaces precipitation-hardening stainless steel to turn into a kind of important trend of development as high-strength stainless steel.This steel is complete
During pansclerosis state, there is optimal corrosion resistance, also there is best halophile stress-corrosion cracking performance.Not only have high strong
Degree, is also provided simultaneously with excellent fracture toughness, horizontal mechanical performance and anticorrosion stress-resistant performance.The excellent combination of such steel
Can, it is widely used in the fields such as aerospace, nuclear reactor and petrochemical industry.
18Ni250 martensite aged stainless steels mainly by 18% Ni, 8.5% Co, 5.0% Mo, 0.4% Ti and
0.1% Al compositions.18Ni Maraging steel has excellent mechanical performance and good quenching property.By 820 DEG C of skies
After cold solution treatment, 18Ni Maraging steel is organized as Ultra-low carbon, high Ni single-phase martensite, then it is carried out again
After 490~510 DEG C of Ageing Treatment and air cooling, just have intermetallic precipitates separate out in M-region, refinement, more
Dissipate, so that steel is strengthened.Generally 18Ni martensite ag(e)ings steel wire is machined, and is carrying out Ageing Treatment.
Because its change in size in Ageing Treatment very small (18Ni250 shrinkage factor is only 0.06~0.07) so, whole
Finishing can be saved in individual processing process, this is the great advantage of Maraging steel.18Ni250 is widely used in the people
With field (such as cold-punching mould, precision die, hydrofoil boat supporting frame) and military field (such as undercarriage, uranium enrichment centrifugation point
The rotary barrel disembarked, missile case, rocket engine cast etc.).
At present, the report in terms of 18Ni250 martensitic stain less steel Welding Problems only have a small amount of welding procedure, there is not yet
Report on its melting welding connecting welding material.
The content of the invention
It is an object of the invention to provide 18Ni250 stainless steels Self-protecting flux-cored wire, spatter is few, appearance of weld
It is attractive in appearance, there is good welding technological properties.
Preparation method it is a further object to provide 18Ni250 stainless steels with Self-protecting flux-cored wire.
The technical solution adopted in the present invention is 18Ni250 stainless steels Self-protecting flux-cored wire, including medicine core and weldering
Skin, wherein medicine core are composed of the following components by mass percentage：Cobalt powder 12.0%-14.0%, nickel powder 9.0%-12.0%, molybdenum powder
8.0%-10.0%, it is electrolysed aluminium powder 0.5%-0.1%, golden red stone flour 20.0%-23.0%, zircon flour 5%-7%, barium fluoride
Powder 22%-25%, Paris white 2%-3%, lithium carbonate powder 2%-3%, brown iron oxide 5%-7%, alumina powder 2%-3%,
Magnesia powder 2%-3%, remaining is iron powder, and above constituent mass percentage sum is 100%.
The features of the present invention also resides in：
Weldering skin is 316 stainless steel belts.
The loading of medicine core powder is 26%-30% in flux-cored wire.
Another technical scheme of the present invention is the preparation of 18Ni250 stainless steels Self-protecting flux-cored wire
Method, comprise the following steps that：
Step 1：Weigh respectively by mass percentage：Cobalt powder 12.0%-14.0%, nickel powder 9.0%-12.0%, molybdenum powder
8.0%-10.0%, it is electrolysed aluminium powder 0.5%-0.1%, golden red stone flour 20.0%-23.0%, zircon flour 5%-7%, barium fluoride
Powder 22%-25%, Paris white 2%-3%, lithium carbonate powder 2%-3%, brown iron oxide 5%-7%, alumina powder 2%-3%,
Magnesia powder 2%-3%, remaining is iron powder, and above constituent mass percentage sum is 100%；
Step 2：Barium fluoride powder, Paris white, lithium carbonate powder, brown iron oxide, alumina powder and the oxidation that step 1 is weighed
Magnesium powder is mixed to get mixed powder A, and sodium silicate binder is added into mixed powder A and is well mixed, is then placed into heating
Sintered in stove, pulverize, sieve, obtain mixed powder B；
Step 3：Molybdenum powder that step 1 is weighed, nickel powder, cobalt powder, electrolysis aluminium powder, iron powder, golden red stone flour and ilmenite powder with
The mixed powder B that step 2 obtains is well mixed, and is placed in drying oven and is dried, and obtains medicine core powder；
Step 4：The medicine core powder that step 3 obtains is wrapped in 316 stainless steel belts by flux-cored wire producing machine, and
316 stainless steel belts are closed using forming machine, obtain welding wire semi-finished product, drawing is carried out again with acetone wiped clean, is drawn to
A diameter of 1.2-1.6mm；
Step 5：After welding wire semi-finished product are through step 4 drawing, the greasy dirt on welding wire is wiped with the cotton for being moistened with acetone, most
Welding wire is stretched through wire drawing machine eventually, disk into disk, pack, obtain 18Ni250 stainless steel Self-protecting flux-cored wires.
In step 2：Sintering temperature is 650 DEG C -750 DEG C, sintering time 4-6h, and sieve granularity 60-140 mesh.
In step 3：Drying temperature is 200 DEG C -300 DEG C, drying time 2-3h.
In step 4：316 stainless steel belt width are 7mm, thickness 0.3mm.
In step 4：The loading of medicine core powder is 26%-30% in flux-cored wire.
The invention has the advantages that
(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；Available for continuous wire feed automatic welder, there is saving and protection gas and higher production
Efficiency；
(2) flux-cored wire of the present invention produces slag using mineral slag system, and the molten bath for making to be formed during welding is protected, played
The effect of self-shield；
(3) preparation method of flux-cored wire of the present invention is simple, easy to operate, available for mass production.
Embodiment
With reference to embodiment, the present invention is described in detail.
18Ni250 stainless steels Self-protecting flux-cored wire of the present invention, including medicine core and weldering skin, wherein medicine core press quality hundred
Divide than composed of the following components：Cobalt powder 12.0%-14.0%, nickel powder 9.0%-12.0%, molybdenum powder 8.0%-10.0%, electrolytic aluminium
Powder 0.5%-0.1%, golden red stone flour 20.0%-23.0%, zircon flour 5%-7%, barium fluoride powder 22%-25%, calcium carbonate
Powder 2%-3%, lithium carbonate powder 2%-3%, brown iron oxide 5%-7%, alumina powder 2%-3%, magnesia powder 2%-3%, its
Remaining is iron powder, and above constituent mass percentage sum is 100%.
The effect of each component and function are as follows in the welding wire：
Molybdenum is the element for promoting ferrite to be formed and stablizing in deposited metal, in addition, the function metals molybdenum according to mother metal
Addition can improve the corrosion resistance of steel, molybdenum can promote the passivation of Fe-Cr alloys；
Cobalt is a kind of austenite former, and cobalt increases the hardness of martensite by solution strengthening；
Nickel is that the element in austenitic area infinitely expands, and can be completely dissolved in austenite, cooled in welding high temperature nickel
Journey can substantially reduce the phase transformation of austenite transformation temperature, so as to suppress block pro-eutectoid ferrite crystal grain body and ferritic side
Plate is formed at first, is advantageous to the formation of acicular ferrite, and relatively low phase transition temperature it is also ensured that uniform tiny pin
Columnar ferrite separates out, and welding seam toughness is good, is a kind of element that can improve pearlite type weld metal toughness；
Electrolytic aluminium has the formation for promoting acicular ferrite, and the toughness for improving welding point is served in weld metal；
Molybdenum is the element for promoting ferrite to be formed and stablizing in deposited metal, and electrolytic aluminium, which has, promotes acicular ferrite
Formed, metallic cobalt is a kind of austenite former, and metallic nickel promotes the formation of austenite, makes have generation austenite in weld seam
Trend, 4 kinds of metal powders are used cooperatively so that austenite and ferrite are proportional in weld seam；
Rutile belongs to the material of low ionizing element, there is stabilising arc, can improve the striking performance of welding wire and improve
The stability of arc burning, and rutile also has certain slag making function；
Titanium dioxide is a kind of gas making, slag making, dehydrogenation material well, is suitable for the special metallurgical mistake of self-protection flux-cored wire
The needs of journey and good appearance of weld, gas making and slag making can be carried out, so as to form more effective gas-slag joint self-insurance
Retaining ring border, such welding wire are adapted to special welding environment；
Rutile, welding wire medicine core can be made to realize the characteristic of " short slag " during fusing is welded, to weld seam melt gold
Sprawling for category is highly beneficial, can also play a part of stable electric arc, appropriate rutile not only stabilising arc, and reduce welding and fly
Splash, 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；
Ilmenite, is mixture, and fusing point will be according to TiO2、FeO、Fe2O3Content determination, the role in welding process：
Promote molten drop with vaporific transition；Promote appearance of weld thin and smooth；Weldering speed is favorably improved, makes the easily de- slag of weld seam, but to direction
Property welding and splash it is unfavorable；
Mica, it is mixture, 1400 DEG C of fusing point, there is the function of stabilising arc and slag making；
White clay, 1810 DEG C of fusing point, is mainly used as binding agent, also fluxing effect；
Titanium dioxide, chemical products, 1560 DEG C of fusing point, role during welding：Stabilising arc, make molten bath tranquil, it is few to splash, lead
Electrically, it is easy to operate；Short slag is formed, opposition, overhead welding have remarkable result；Active slag can be produced, uniform fold is in welded joints
Protect weld seam, TiO2Viscosity coefficient of dross is very low at high temperature；De- slag is convenient, TiO2Crystallization rate is fast；Make weld ripples careful；Can be with oxidation
Iron is combined into titanate and plays deoxidation into slag；
Ferrotianium, there is excellent deoxidation in welding process.
The 18Ni250 stainless steels preparation method of Self-protecting flux-cored wire, is comprised the following steps that：
Step 1：Weigh cobalt powder 12.0%-14.0%, nickel powder 9.0%-12.0%, molybdenum powder respectively by mass percentage
8.0%-10.0%, it is electrolysed aluminium powder 0.5%-0.1%, golden red stone flour 20.0%-23.0%, zircon flour 5%-7%, barium fluoride
Powder 22%-25%, Paris white 2%-3%, lithium carbonate powder 2%-3%, brown iron oxide 5%-7%, alumina powder 2%-3%,
Magnesia powder 2%-3%, remaining is iron powder, and above constituent mass percentage sum is 100%；
Step 2：Barium fluoride powder, Paris white, lithium carbonate powder, brown iron oxide, alumina powder and the oxidation that step 1 is weighed
Magnesium powder is mixed to get mixed powder A, and sodium silicate binder is added into mixed powder A and is well mixed, is then placed into heating
650 DEG C of -750 DEG C of sintering 4-6h, pulverize, cross 60-140 mesh sieves, obtain mixed powder B in stove；
Step 3：Molybdenum powder that step 1 is weighed, nickel powder, cobalt powder, electrolysis aluminium powder, iron powder, golden red stone flour and ilmenite powder with
The mixed powder B that step 2 obtains is well mixed, and is placed in 200 DEG C of -300 DEG C of drying 2h-3h in drying oven, is obtained medicine core powder；
Step 4：The medicine core powder that step 3 obtains is wrapped in 316 stainless steel belts by flux-cored wire producing machine, welded
The loading of medicine core powder is 26%-30% in silk, and uses forming machine by width for 7mm, and the 316 of thickness 0.3mm are stainless
Steel steel band closes, and obtains welding wire semi-finished product, carries out drawing again with acetone wiped clean, be drawn to a diameter of 1.2-1.6mm；
Step 5：After welding wire semi-finished product are through step 4 drawing, the greasy dirt on welding wire is wiped with the cotton for being moistened with acetone, most
Welding wire is stretched through wire drawing machine eventually, disk into disk, pack, obtain 18Ni250 stainless steel Self-protecting flux-cored wires.
Embodiment 1
Step 1：Cobalt powder 180g, nickel powder 110g, molybdenum powder 110g are weighed, is electrolysed aluminium powder 2g, golden red stone flour 120g, zircon flour
60g, barium fluoride powder 220g, Paris white 30g, lithium carbonate powder 30g, brown iron oxide 60g, alumina powder 30g, magnesia powder 20g,
Iron powder 28g；
Step 2：Barium fluoride powder, Paris white, lithium carbonate powder, brown iron oxide, alumina powder and the oxidation that step 1 is weighed
Magnesium powder is mixed to get mixed powder A, and 180g sodium silicate binders are added into mixed powder A and are well mixed, are then placed into
650 DEG C of sintering 4h in heating furnace, pulverize, cross 60-140 eye mesh screens, obtain mixed powder B；
Step 3：Molybdenum powder that step 1 is weighed, nickel powder, cobalt powder, electrolysis aluminium powder, iron powder, golden red stone flour and ilmenite powder with
The mixed powder B that step 2 obtains is well mixed, and is placed in 200 DEG C of drying 2h in drying oven, is obtained medicine core powder；
Step 4：By width be 7mm, thickness 0.3mm 316 stainless steel belts be placed on welding wire forming machine put band machine on,
Stainless steel belt is rolled into by U-type groove by the indent of forming machine, the medicine core powder that step 3 obtains is put into U-type groove, medicine core
Then the filling rate control of powder makes U-type groove roll closure, is drawn to again with acetone wiped clean 26% with forming machine
A diameter of 1.2mm, be moistened with acetone cotton wipe welding wire on greasy dirt, finally welding wire is stretched through wire drawing machine, disk into disk,
Pack, obtain 18Ni250 stainless steel Self-protecting flux-cored wires.
Flux-cored wire made from embodiment 1 is applied to flux cored wire arc welding (FCAW-S), without additional protective gas.Weldering
Narrow bars part is：Welding current is 140-180A, weldingvoltage 15.5-24.5V.After tested, the tensile strength of welding point is
765Mpa, yield limit 502Mpa, the contraction percentage of area 42%, ballistic work 71J.Performance meets 18Ni250 martensite ag(e)ings
The requirement of stainless steel.
Embodiment 2
Step 1：Cobalt powder 170g, nickel powder 110g, molybdenum powder 110g are weighed, is electrolysed aluminium powder 2g, golden red stone flour 120g, zircon flour
60g, barium fluoride powder 220g, Paris white 30g, lithium carbonate powder 30g, brown iron oxide 60g, alumina powder 30g, magnesia powder 20g,
Iron powder 28g；
Step 2：Barium fluoride powder, Paris white, lithium carbonate powder, brown iron oxide, alumina powder and the oxidation that step 1 is weighed
Magnesium powder is mixed to get mixed powder A, and 180g sodium silicate binders are added into mixed powder A and are well mixed, are then placed into
700 DEG C of sintering 4.5h in heating furnace, pulverize, cross 60-140 eye mesh screens, obtain mixed powder B；
Step 3：Molybdenum powder that step 1 is weighed, nickel powder, cobalt powder, electrolysis aluminium powder, iron powder, golden red stone flour and ilmenite powder with
The mixed powder B that step 2 obtains is well mixed, and is placed in 250 DEG C of drying 2.5h in drying oven, is obtained medicine core powder；
Step 4：By width be 7mm, thickness 0.3mm 316 stainless steel belts be placed on welding wire forming machine put band machine on,
Stainless steel belt is rolled into by U-type groove by the indent of forming machine, the medicine core powder that step 3 obtains is put into U-type groove, medicine core
Then the filling rate control of powder makes U-type groove roll closure, is drawn to again with acetone wiped clean 27% with forming machine
A diameter of 1.4mm, be moistened with acetone cotton wipe welding wire on greasy dirt, finally welding wire is stretched through wire drawing machine, disk into disk,
Pack, obtain 18Ni250 stainless steel Self-protecting flux-cored wires.
Flux-cored wire made from embodiment 2 is applied to flux cored wire arc welding (FCAW-S), without additional protective gas.Weldering
Narrow bars part is：Welding current is 140-180A, weldingvoltage 15.5-24.5V.After tested, the tensile strength of welding point is
701Mpa, yield limit 593Mpa, the contraction percentage of area 61%, ballistic work 61J.Performance meets 18Ni250 martensite ag(e)ings
The requirement of stainless steel.
Embodiment 3
Step 1：Cobalt powder 180g, nickel powder 100g, molybdenum powder 100g are weighed, is electrolysed aluminium powder 5g, golden red stone flour 130g, zircon flour
60g, barium fluoride powder 230g, Paris white 30g, lithium carbonate powder 30g, brown iron oxide 70g, alumina powder 20g, magnesia powder 20g,
Iron powder 25g；
Step 2：Barium fluoride powder, Paris white, lithium carbonate powder, brown iron oxide, alumina powder and the oxidation that step 1 is weighed
Magnesium powder is mixed to get mixed powder A, and 180g sodium silicate binders are added into mixed powder A and are well mixed, are then placed into
750 DEG C of sintering 6h in heating furnace, pulverize, cross 60-140 eye mesh screens, obtain mixed powder B；
Step 3：Molybdenum powder that step 1 is weighed, nickel powder, cobalt powder, electrolysis aluminium powder, iron powder, golden red stone flour and ilmenite powder with
The mixed powder B that step 2 obtains is well mixed, and is placed in 300 DEG C of drying 3h in drying oven, is obtained medicine core powder；
Step 4：By width be 7mm, thickness 0.3mm 316 stainless steel belts be placed on welding wire forming machine put band machine on,
Stainless steel belt is rolled into by U-type groove by the indent of forming machine, the medicine core powder that step 3 obtains is put into U-type groove, medicine core
Then the filling rate control of powder makes U-type groove roll closure, is drawn to again with acetone wiped clean 30% with forming machine
A diameter of 1.6mm, be moistened with acetone cotton wipe welding wire on greasy dirt, finally welding wire is stretched through wire drawing machine, disk into disk,
Pack, obtain 18Ni250 stainless steel Self-protecting flux-cored wires.
Flux-cored wire made from embodiment 3 is applied to flux cored wire arc welding (FCAW-S), without additional protective gas.Weldering
Narrow bars part is：Welding current is 140-180A, weldingvoltage 15.5-24.5V.After tested, the tensile strength of welding point is
701Mpa, yield limit 593Mpa, the contraction percentage of area 61%, ballistic work 61J.Performance meets 18Ni250 martensite ag(e)ings
The requirement of stainless steel.
Embodiment 4
Step 1：Cobalt powder 170g, nickel powder 110g, molybdenum powder 110g are weighed, is electrolysed aluminium powder 4g, golden red stone flour 120g, zircon flour
50g, barium fluoride powder 220g, Paris white 30g, lithium carbonate powder 20g, brown iron oxide 60g, alumina powder 20g, magnesia powder 30g,
Iron powder 56g；
Step 2：Barium fluoride powder, Paris white, lithium carbonate powder, brown iron oxide, alumina powder and the oxidation that step 1 is weighed
Magnesium powder is mixed to get mixed powder A, and 180g sodium silicate binders are added into mixed powder A and are well mixed, are then placed into
720 DEG C of sintering 5.5h in heating furnace, pulverize, cross 60-140 eye mesh screens, obtain mixed powder B；
Step 3：Molybdenum powder that step 1 is weighed, nickel powder, cobalt powder, electrolysis aluminium powder, iron powder, golden red stone flour and ilmenite powder with
The mixed powder B that step 2 obtains is well mixed, and is placed in 220 DEG C of drying 2h in drying oven, is obtained medicine core powder；
Step 4：By width be 7mm, thickness 0.3mm 316 stainless steel belts be placed on welding wire forming machine put band machine on,
Stainless steel belt is rolled into by U-type groove by the indent of forming machine, the medicine core powder that step 3 obtains is put into U-type groove, medicine core
Then the filling rate control of powder makes U-type groove roll closure, is drawn to again with acetone wiped clean 29% with forming machine
A diameter of 1.4mm, be moistened with acetone cotton wipe welding wire on greasy dirt, finally welding wire is stretched through wire drawing machine, disk into disk,
Pack, obtain 18Ni250 stainless steel Self-protecting flux-cored wires.
Flux-cored wire made from embodiment 4 is applied to flux cored wire arc welding (FCAW-S), without additional protective gas.Weldering
Narrow bars part is：Welding current is 140-180A, weldingvoltage 15.5-24.5V.After tested, the tensile strength of welding point is
734Mpa, yield limit 503Mpa, the contraction percentage of area 45%, ballistic work 63J.Performance meets 18Ni250 martensite ag(e)ings
The requirement of stainless steel.
Embodiment 5
Step 1：Cobalt powder 175g, nickel powder 120g, molybdenum powder 115g are weighed, is electrolysed aluminium powder 1g, golden red stone flour 120g, zircon flour
50g, barium fluoride powder 220g, Paris white 30g, lithium carbonate powder 25g, brown iron oxide 60g, alumina powder 25g, magnesia powder 30g,
Iron powder 29g；
Step 2：Barium fluoride powder, Paris white, lithium carbonate powder, brown iron oxide, alumina powder and the oxidation that step 1 is weighed
Magnesium powder is mixed to get mixed powder A, and 180g sodium silicate binders are added into mixed powder A and are well mixed, are then placed into
680 DEG C of sintering 5h in heating furnace, pulverize, cross 60-140 eye mesh screens, obtain mixed powder B；
Step 3：Molybdenum powder that step 1 is weighed, nickel powder, cobalt powder, electrolysis aluminium powder, iron powder, golden red stone flour and ilmenite powder with
The mixed powder B that step 2 obtains is well mixed, and is placed in 200 DEG C of drying 2h in drying oven, is obtained medicine core powder；
Step 4：By width be 7mm, thickness 0.3mm 316 stainless steel belts be placed on welding wire forming machine put band machine on,
Stainless steel belt is rolled into by U-type groove by the indent of forming machine, the medicine core powder that step 3 obtains is put into U-type groove, medicine core
Then the filling rate control of powder makes U-type groove roll closure, is drawn to again with acetone wiped clean 26% with forming machine
A diameter of 1.4mm, be moistened with acetone cotton wipe welding wire on greasy dirt, finally welding wire is stretched through wire drawing machine, disk into disk,
Pack, obtain 18Ni250 stainless steel Self-protecting flux-cored wires.
Flux-cored wire made from embodiment 5 is applied to flux cored wire arc welding (FCAW-S), without additional protective gas.Weldering
Narrow bars part is：Welding current is 160-180A, weldingvoltage 16.5-24.5V.After tested, the tensile strength of welding point is
675Mpa, yield limit 460Mpa, the contraction percentage of area 52%, ballistic work 55J.Performance meets 18Ni250 martensite ag(e)ings
The requirement of stainless 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 attractive in appearance,
The advantages of good welds processing performance；Available for continuous wire feed automatic welder, there is saving and protection gas and higher production to imitate
Rate；Silk produces slag using mineral slag system, and the molten bath for making to be formed during welding is protected, and serves the effect of self-shield；Prepare
Method is simple, easy to operate, available for mass production.
Claims (8)
1.18Ni250 stainless steels Self-protecting flux-cored wire, it is characterised in that including medicine core and weldering skin, wherein medicine core presses matter
It is composed of the following components to measure percentage：Cobalt powder 12.0%-14.0%, nickel powder 9.0%-12.0%, molybdenum powder 8.0%-10.0%, electricity
Solve aluminium powder 0.5%-0.1%, golden red stone flour 20.0%-23.0%, zircon flour 5%-7%, barium fluoride powder 22%-25%, carbon
Sour calcium powder 2%-3%, lithium carbonate powder 2%-3%, brown iron oxide 5%-7%, alumina powder 2%-3%, magnesia powder 2%-
3%, remaining is iron powder, and above constituent mass percentage sum is 100%.
2. 18Ni250 stainless steels Self-protecting flux-cored wire according to claim 1, it is characterised in that the weldering skin
For 316 stainless steel belts.
3. 18Ni250 stainless steels Self-protecting flux-cored wire according to claim 1, it is characterised in that flux-cored wire
The loading of middle medicine core powder is 26%-30%.
The preparation method of 4.18Ni250 stainless steels Self-protecting flux-cored wire, it is characterised in that comprise the following steps that：
Step 1：Weigh cobalt powder 12.0%-14.0%, nickel powder 9.0%-12.0%, molybdenum powder 8.0%- respectively by mass percentage
10.0%, it is electrolysed aluminium powder 0.5%-0.1%, golden red stone flour 20.0%-23.0%, zircon flour 5%-7%, barium fluoride powder
22%-25%, Paris white 2%-3%, lithium carbonate powder 2%-3%, brown iron oxide 5%-7%, alumina powder 2%-3%, oxygen
Change magnesium powder 2%-3%, remaining is iron powder, and above constituent mass percentage sum is 100%；
Step 2：Barium fluoride powder, Paris white, lithium carbonate powder, brown iron oxide, alumina powder and the magnesia powder that step 1 is weighed
Mixed powder A is mixed to get, sodium silicate binder is added into mixed powder A and is well mixed, is then placed into heating furnace
Sintering, pulverizes, sieves, obtain mixed powder B；
Step 3：Molybdenum powder, nickel powder, cobalt powder, electrolysis aluminium powder, iron powder, golden red stone flour and ilmenite powder and the step 2 that step 1 is weighed
Obtained mixed powder B is well mixed, and is placed in drying oven and is dried, and obtains medicine core powder；
Step 4：The medicine core powder that step 3 obtains is wrapped in 316 stainless steel belts by flux-cored wire producing machine, and used
Forming machine closes 316 stainless steel belts, obtains welding wire semi-finished product, carries out drawing again with acetone wiped clean, is drawn to diameter
For 1.2-1.6mm；
Step 5：After welding wire semi-finished product are through step 4 drawing, the greasy dirt on welding wire, final warp are wiped with the cotton for being moistened with acetone
Wire drawing machine stretches welding wire, disk into disk, pack, obtain 18Ni250 stainless steel Self-protecting flux-cored wires.
5. the preparation method of 18Ni250 stainless steels Self-protecting flux-cored wire according to claim 4, its feature exist
In in the step 2：Sintering temperature is 650 DEG C -750 DEG C, sintering time 4-6h, and sieve granularity 60-140 mesh.
6. the preparation method of 18Ni250 stainless steels Self-protecting flux-cored wire according to claim 4, its feature exist
In in the step 3：Drying temperature is 200 DEG C -300 DEG C, drying time 2h-3h.
7. the preparation method of 18Ni250 stainless steels Self-protecting flux-cored wire according to claim 4, its feature exist
In in the step 4：316 stainless steel belt width are 7mm, thickness 0.3mm.
8. the preparation method of 18Ni250 stainless steels Self-protecting flux-cored wire according to claim 4, its feature exist
In in the step 4：The loading of medicine core powder is 26%-30% in welding wire.
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| CN108526752A (en) * | 2018-05-08 | 2018-09-14 | 山东省科学院海洋仪器仪表研究所 | One kind is paddled welding self-protection flux-cored wire under environment |
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| CN112171108A (en) * | 2020-09-11 | 2021-01-05 | 中交第二公路勘察设计研究院有限公司 | High-viscosity high-toughness flux-cored wire for U-rib internal elevation welding and preparation method thereof |
| CN112404795A (en) * | 2020-10-08 | 2021-02-26 | 武汉科技大学 | Seamless self-protection flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel |
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Application publication date: 20171222 |