CN103223561B - Stainless steel 347 metal core welding wire with low hexavalent chrome emission and preparation method of welding wire - Google Patents
Stainless steel 347 metal core welding wire with low hexavalent chrome emission and preparation method of welding wire Download PDFInfo
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- CN103223561B CN103223561B CN201310066627.2A CN201310066627A CN103223561B CN 103223561 B CN103223561 B CN 103223561B CN 201310066627 A CN201310066627 A CN 201310066627A CN 103223561 B CN103223561 B CN 103223561B
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- 238000002360 preparation method Methods 0.000 title abstract description 6
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- 239000011701 zinc Substances 0.000 claims description 15
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- 238000011049 filling Methods 0.000 claims description 9
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- 230000008021 deposition Effects 0.000 claims description 4
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- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
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- 230000008901 benefit Effects 0.000 abstract description 3
- 239000010953 base metal Substances 0.000 abstract 1
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- 238000012360 testing method Methods 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 208000025865 Ulcer Diseases 0.000 description 3
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- 238000010521 absorption reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
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Abstract
A stainless steel 347 metal core welding wire with low hexavalent chrome emission and a preparation method of the welding wire are suitable for the field of welding materials. The welding wire comprises the following components: 0.025-0.07wt.% of C, 45-60wt.% of Cr, 25-31wt.% of Ni, 4-7wt.% of Mn, 0.66-1.5wt.% of Si, 0.3-2wt.% of Ti, 0.3-2wt.% of Zn, 0.3-2wt.% of Zr, 0.25-1.2wt.% of Nb, and the balance of Fe and unavoidable impurities. The welding wire and the preparation method ensure that the mechanical property of welding wire deposited metal is matched with that of base metal, and a stainless steel belt is replaced with a carbon steel belt, so that the cost is lowered; 30-60% of the total amount of hexavalent chrome (Cr<+6>) in welding fume is reduced; a welding operation environment is improved; and in addition, the welding wire and the preparation method have the advantages that splattering is low, and the combination property of the formed deposited metal is excellent.
Description
Technical field
The present invention relates to and be applicable to welding 18%Cr-8%Ni-Nb stainless steel (SUS347 etc.) and 18%Cr-8%Ni-Ti stainless 347 (L) field of welding material, particularly relate to the low Cr VI (Cr in weld fumes
+ 6) content gas protection stainless steel 347 metal core welding wire.
Background technology
Because in stainless steel, Cr content is higher, during soldering stainless steel, welding material all can add appropriate Cr element in order to the corrosion resistance meeting weld seam, by promoting oxide top layer, makes weld seam produce enough corrosion resistances to meet welding requirements.But in wlding and mother metal, Cr enters weld fumes in welding evaporation, and can be at high temperature oxidized to the virose Cr of tool by oxygen
+ 6.
Cr
+ 6in human body, there is carcinogenesis, also can cause other many health problems, the hexavalent chromium compound as sucked some higher concentration can cause rhinorrhea, sneezes, itch, nosebleed, ulcer and perforation of nasal septum.The contact of short-term heavy dose, can produce adverse consequences in contact site, comprises ulcer, schneiderian membrance stimulates and perforation of nasal septum.Absorption over much dosage can cause the damage of kidney and liver, nauseating, GI irritation, gastric ulcer, spasm are even dead.Skin contact can cause ulcer or allergic reaction Cr VI (Cr
+ 6) be one of the easiest anaphylactic metal, be only second to nickel.In order to ensure the health of welding personnel, 2006 Occupational Safety and Health Administration of the U.S. (OSHA) newly promulgated Cr VI (Cr in weld fumes
+ 6) permission exposure limit value (PEL), by 52 original μ g/m
3be reduced to 3 μ g/m
3.
Stainless steel metal core welding wire compares the welding of various steel with solid core welding wire, composition and the ratio of strong adaptability adjustment solder flux are very convenient and easy, can provide required weld seam chemical composition; Processing performance is good, and appearance of weld is attractive in appearance, obtains and is well shaped; Deposition rate is fast, and the current density of the high flux-cored wire under same weld electric current of production efficiency is large, and burn-off rate is fast, and its deposition rate is about 85%-90%.
Stainless steel metal core welding wire is compared with flux-cored wire, and large quantifier elimination proves the Cr in weld fumes and flue dust
+ 6metal core welding wire will be far smaller than flux-cored wire, in addition, current stainless flux-cored wire does crust with stainless steel belt, stainless steel welding stick is made by rolling, drawing process, the application of stainless steel belt increases welding wire production and stainless steel welded cost, therefore, exploitation is a kind of, low Cr VI (Cr
+ 6) discharge capacity, the outstanding stainless steel metal core welding wire 347 of welding procedure is significant.
Summary of the invention:
The present invention is formed in view of the foregoing, its object is to provide low Cr VI (Cr
+ 6) discharge capacity, the stainless steel metal core welding wire 347 that welding procedure is outstanding.
In order to solve above-mentioned problem, the present invention proposes a kind of low Cr VI (Cr
+ 6) the stainless steel metal core welding wire that discharges, it can when ensure welding wire deposited metal mechanical property reach mate with mother metal, replace stainless steel belt to reduce costs with carbon steel steel band, decrease the Cr VI (Cr of 30%-60% in weld fumes simultaneously
+ 6) total amount, improve weld job environment, there is splashing in addition little, the advantage of the deposited metal high comprehensive performance of formation.
For achieving the above object, the present invention takes following technical scheme:
Stainless steel 347 metal core welding wires for low Cr VI discharge, it is characterized in that, in welding wire, each elemental composition scope is as follows: C:0.025 ~ 0.07wt.%; Cr:45 ?60wt.%; Ni:25 ~ 31wt.%; Mn:4 ~ 7wt.%; Si:0.66 ~ 1.5wt.%; Ti:0.3 ~ 2wt.%; Zn:0.3 ~ 2wt.%; Zr:0.3 ~ 2wt.%; Nb:0.25 ?1.2wt.%; Surplus is Fe and inevitable impurity.
Further, in welding wire, metal-cored chemical composition mass percent is as follows: C:0.03 ~ 0.05wt.%; Cr:52 ~ 58wt.%; Ni:26 ~ 30wt.%; Mn:4 ~ 6wt.%; Si:0.66 ~ 1.5wt.%; Ti:0.5 ~ 1wt.%; Zn:0.5 ~ 1.5wt.%; Zr:0.5 ~ 1wt.%; Nb:0.5 ?1wt.%; Surplus is Fe and inevitable impurity.
Further, described metal-cored powder comprises: hafnium metal powfer: 40 ~ 120 orders, metal nickel powder: 40 ~ 120 orders, electrolytic manganese powder: 40 ~ 120 orders, ferrosilicon powder: 60 ~ 120 orders, titanium-iron powder: 60 ~ 120 orders, metal zinc: 60 ~ 120 orders, zirconium ferrosilicon powder: 60 ~ 120 orders, metal iron powder: 60 ~ 120 orders, ferro-niobium 60 ~ 120 order.
The stainless steel preparation method of 347 metal core welding wires of described a kind of low Cr VI discharge, it is characterized in that, described welding wire crust band is carbon steel steel band 8 × 0.4mm, metal core welding wire filling rate: 30% ~ 38%, the diameter 1.2mm of welding wire.
The stainless steel application of 347 metal core welding wires of described a kind of low Cr VI discharge, is characterized in that:
Adopt 95 ~ 98%Ar+2 ~ 5%O
2gas shielded prepares deposition hardfacing alloy technique, and welding condition is: voltage: 22 ~ 34V; Electric current: 160 ~ 260A; Wire feed rate: 350 ~ 500mm/min; Gas flow rate: 13 ~ 20L/min; Welding wire stretches out the distance of ignition tip: 14 ~ 25mm.
Further, described welding condition is: voltage: 24 ~ 30V; Electric current: 200 ~ 260A; Wire feed rate: 400 ~ 500mm/min; Gas flow rate: 15 ~ 20L/min; Welding wire stretches out the distance of ignition tip: 15 ~ 22mm.
In deposited metal, the content of each element is at following scope: C:0.021 ~ 0.03wt.%; Cr:19.2 ~ 21.1wt.%; Ni:9 ~ 11.0wt.%; Mn:0.97 ~ 2.5wt.%; Si:0.41 ~ 1wt.%; Ti:0.01 ~ 1wt.%; Zn:0.3 ~ 1wt.%; Zr:0.2 ~ 1wt.%; Nb:0.21-1.1wt.%; Fe: surplus.
The weld fumes that this metal core welding wire is collected under above-mentioned process conditions, in weld fumes, chromium is mainly with Cr
2o
3form exists, there is few a part of chromium can exist with chromic form, Zn and Zr in core wire composition finally can be present in flue dust and deposited metal in the form of the oxide, simultaneously, the content of welding arc peripheral activity oxygen can be decreased at them in welding process, thus suppress chromic generation in weld fumes, in addition, because steel band selects mild steel steel band, reduce manufacturing cost.
Main feature of the present invention is metal core welding wire crust is carbon steel steel band, avoids by the high cost problem of 304L stainless steel belt.Meanwhile, on the basis not reducing Cr content in medicine core, add the element such as Zn, Zr, reduce content of 6-valence Cr ions in weld fumes, in core wire, the element such as Si, Ti reduces spatter in addition.With the present invention development metal core welding wire has low Cr VI discharge capacity, welding arc stablility, splashing is little, appearance of weld is attractive in appearance, the advantage of high comprehensive performance.
Accompanying drawing explanation
The welding parameter that Fig. 1 diameter 1.2mm metal-cored 347 (L) stainless steel welding stick is suitable
Cr in Fig. 2 embodiment welding wire weld fumes
+ 6with Cr in traditional welding wire flue dust
+ 6content balance figure
Fig. 3 embodiment welding wire Han Ruowei surveys voltage pattern
Detailed description of the invention
Metal core welding wire of the present invention is by the restriction of above-mentioned example, and any improvement in the scope that claim of the present invention is protected and change are all within protection scope of the present invention.
Select the carbon steel steel band of 8 × 0.3mm to be metal core welding wire crust, now rolled into U-shaped.Crome metal powder, metallic nickel powder, electrolytic etching of metal manganese powder end, 4-5 silicon iron powder, ferrotianium powder, metallic zinc powder, zirconium ferrosilicon powder, ferro-niobium powder, metal iron powders etc. are configured to medicinal powder, institute get powder granularity be by 80 object sieves.Got various powder are put into mixed powder machine mixing 40 minutes, then added by mixed-powder in U-shaped carbon steel trough of belt, filling rate is 30 ~ 34%, by U-lag river mouth, medicinal powder is wrapped up wherein.Then make it be the wire drawing die of 2.4,2.26,1.96,1.83,1.73,1.6,1.5,1.41,1.34,1.26,1.19 respectively by diameter, by road drawing, tube reducing, finally make its diameter reach 1.19mm.
Specific embodiment is as follows:
1, a kind of low Cr
+ 6the stainless steel metal core welding wire of discharge, relative to welding wire gross mass, containing (mass fraction wt.%) is: C:0.037wt.%; Cr:53wt.%; Ni:27wt.%; Mn:4wt.%; Si:0.68wt.%; Ti:0.6wt.%; Zn:0.9wt.%; Zr:0.5wt.%; Nb:0.6; Fe: surplus.The filling rate of medicinal powder in steel band is 30%.Adopt 98%Ar+2%O
2the welding condition of gas shielded arc welding is: voltage 26V; Electric current 220A; Wire feed rate 400mm/min; Gas flow rate 20L/min; Welding wire stretches out the distance 20mm of ignition tip.The deposited metal main component adopting above-mentioned technique to prepare is: Cr:20wt.%; Ni:10wt.%; Mn:1.8wt.%; Si:0.45wt.%;
2, a kind of low Cr
+ 6the stainless steel metal core welding wire of discharge, relative to welding wire gross mass, containing (mass fraction wt.%) is: C:0.025wt.%; Cr:57wt.%; Ni:26wt.%; Mn:5wt.%; Si:1wt.%; Ti:0.5wt.%; Zn:1.5wt.%; Zr:0.6wt.%; Nb:0.57wt.%; Fe: surplus.The filling rate of medicinal powder in steel band is 38%.Adopt 98%Ar+2%O
2the welding condition of gas shielded arc welding is: voltage 25V; Electric current 200A; Wire feed rate 440mm/min; Gas flow rate 19L/min; Welding wire stretches out the distance 22mm of ignition tip.The deposited metal main component adopting above-mentioned technique to prepare is: Cr:19.5wt.%; Ni:9.3wt.%; Mn:1.2wt.%; Si:0.6wt.%;
3, a kind of low Cr
+ 6the stainless steel metal core welding wire of discharge, relative to welding wire gross mass, containing (mass fraction wt.%) is: C:0.04wt.%; Cr:55wt.%; Ni:28wt.%; Mn:5wt.%; Si:1.5wt.%; Ti:0.7wt.%; Zn:1.2wt.%; Zr:1wt.%; Nb:1.0wt.%; Fe: surplus.The filling rate of medicinal powder in steel band is 32%.Adopt 98%Ar+2%O
2the welding condition of gas shielded arc welding is: voltage 26V; Electric current 245A; Wire feed rate 500mm/min; Gas flow rate 20L/min; Welding wire stretches out the distance 17mm of ignition tip.The deposited metal main component adopting above-mentioned technique to prepare is: Cr:19.7wt.%; Ni:9.6wt.%; Mn:1.7wt.%; Si:0.7wt.%.
4, a kind of low Cr
+ 6the stainless steel metal core welding wire of discharge, relative to welding wire gross mass, containing (mass fraction wt.%) is: C:0.05wt.%; Cr:52wt.%; Ni:27wt.%; Mn:6wt.%; Si:1wt.%; Ti:1wt.%; Zn:0.8wt.%; Zr:0.8wt.%Nb:0.5wt.%; ; Fe: surplus.The filling rate of medicinal powder in steel band is 31%.Adopt 98%Ar+2%O
2the welding condition of gas shielded arc welding is: voltage 28V; Electric current 230A; Wire feed rate 440mm/min; Gas flow rate 21L/min; Welding wire stretches out the distance 19mm of ignition tip.The deposited metal main component adopting above-mentioned technique to prepare is: Cr:20.5wt.%; Ni:10.5wt.%; Mn:1.9wt.%; Si:0.9wt.%.
5, a kind of low Cr
+ 6the stainless steel metal core welding wire of discharge, relative to welding wire gross mass, containing (mass fraction wt.%) is: C:0.045wt.%; Cr:58wt.%; Ni:30wt.%; Mn:5wt.%; Si:1.3wt.%; Ti:1wt.%; Zn:1wt.%; Zr:0.9wt.%; Nb:0.67wt.%; Fe: surplus.The filling rate of medicinal powder in steel band is 35%.Adopt 98%Ar+2%O
2the welding condition of gas shielded arc welding is: voltage 30V; Electric current 200A; Wire feed rate 420mm/min; Gas flow rate 18L/min; Welding wire stretches out the distance 19mm of ignition tip.The deposited metal main component adopting above-mentioned technique to prepare is: Cr:21wt.%; Ni:10.5wt.%; Mn:1.7wt.%; Si:1wt.%.
6, a kind of low Cr
+ 6the stainless steel metal core welding wire of discharge, relative to welding wire gross mass, containing (mass fraction wt.%) is: C:0.039wt.%; Cr:54wt.%; Ni:30wt.%; Mn:6wt.%; Si:0.66wt.%; Ti:1.5wt.%; Zn:0.5wt.%; Zr:1wt.%; Nb:0.9wt.%; Fe: surplus.The filling rate of medicinal powder in steel band is 34%.Adopt 98%Ar+2%O
2the welding condition of gas shielded arc welding is: voltage 26V; Electric current 210A; Wire feed rate 450mm/min; Gas flow rate 15L/min; Welding wire stretches out the distance 21mm of ignition tip.The deposited metal main component adopting above-mentioned technique to prepare is: Cr:22wt.%; Ni:12wt.%; Mn:2.1wt.%; Si:1.4wt.%.
Table 1 carbon steel band chemical composition (wt.%)
| Element | C | Si | Mn | S | P |
| Content (%) | 0.03-0.04 | <0.065 | <0.33 | <0.025 | <0.03 |
The mass fraction wt.% that in table 2 comparative example, welding wire medicinal powder contains relative to welding wire gross mass
(Cr in weld fumes
+ 6content)
Air-suction cover in flue dust collecting device can 360 degree of rotations, in flexible inhalation arm, universal joint is housed, signature can be gone up, all around move, soot dust granule material is sucked, then collected in measurement unit's time weld fumes weight, Cr (VI) content according to the standard detection every kilogram flue dust of ISO16740, its result in table 3.Metewand is with content 1.3-1.5 × 10 of tradition 347 (L) stainless steel MIG/MAG welding wire
3mg/Kg, when lower than 1.3 × 10
3be " excellent: Ο " during mg/Kg, be greater than 1.3 × 10
3during mg/Kg be " poor: × ".
(mechanical property)
Tensile strength, 0 DEG C of absorption energy (toughness) is evaluated based on GB/T 17853-1999.Its result is displayed in Table 3.The metewand of tensile strength be more than 500MPa 640MPa once time for " excellent: Ο " is lower than 500MPa or more than being " poor: × " during 640MPa.In addition, 0 DEG C absorb can metewand be " excellent: Ο " when being more than 60J, lower than during 60J being " poor: × ".In addition, when evaluating extensibility based on GB/T 17853-1999, when its metewand be more than 22% be " excellence: Ο ", lower than 22% time be " poor: × ".Elongation is be " excellent: Ο " higher than 25% according to metewand, lower than 25% time be " poor: × "
(ferrite number)
Cut this welding wire welding stainless steel weld joint deposited metal part as sample, cross section is as detection faces, corrode with the corrosive liquid that 100ml distilled water, 100ml hydrochloric acid (analyzing pure), 10ml nitric acid (top grade is pure) are prepared after grinding and polishing, clearly can see that ferrite grain boundaries is as the criterion, then use Zeiss, Germany AXIO ImagerZ1m type light microscope, measure with reference to the ferrite content of division lines method to sample in GB/T 1954-2008 " chromiumnickel austenite stainless steel weld seam ferrite content measuring method ".For ensure measurement result statistically and reasonability, covering the welded seam area within melt run to each sample, random selecting 20 visual fields measure, and get the mean value of 20 measurement results as final tested volume, its result is in table 3.Metewand is ferrite number FN is " excellent: Ο " when 5%-12%, lower than 5% or higher than 12% time be " poor: × "
(welding wire spatter loss coefficient)
Spatter loss coefficient assessment method adopts semiclosed case to collect splashing, and test test piece for welding (size 300 × 30 × 20mm, Q235 carbon steel sheet) is placed on testing stand, losing, being covered, welding in copper cover with conductive copper cover for preventing from splashing; Carry out being welded on welding on test plate (panel) with automatic welding carriage and be about the weld seam of 250mm together, postwelding collects the splashing metallic particles in copper cover on testing stand, and claim its weight, its result in table 3.Metewand is be " excellent: Ο " below 0.5%, higher than 0.5% time be " poor: × ".
Spatter loss coefficient ψ computing formula is as follows:
M in formula
2-splashing weight (g);
M
1-welding wire expendable weight (g).
(overall merit)
As overall merit, welding operation (Cr in arc stability, spatter loss coefficient, flue dust
+ 6content) and deposited metal performance (hot strength, ballistic work, FN number) all meets " Ο " time be evaluated as ⊙, even if having any one project appraisal for × time, overall merit is also ×.
The low Cr of table 3
+ 6, low cost stainless steel metal core 347 (L) evaluation result
As shown in table 3, embodiment NO.1-NO.6 is that the composition of metal core welding wire meets scope of the present invention so comprehensive performance evaluation is " excellent ", and NO.7-NO.24 does not meet scope of the present invention, and therefore comprehensive performance evaluation is defective.
Claims (6)
1. stainless steel 347 metal core welding wires for low Cr VI discharge, it is characterized in that, in welding wire, each elemental composition scope is as follows: C:0.025 ~ 0.07wt.%; Cr:45 ?60wt.%; Ni:25 ~ 31wt.%; Mn:4 ~ 7wt.%; Si:0.66 ~ 1.5wt.%; Ti:0.3 ~ 2wt.%; Zn:0.3 ~ 2wt.%; Zr:0.3 ~ 2wt.%; Nb:0.25 ?1.2wt.%; Surplus is Fe and inevitable impurity.
2. stainless steel 347 metal core welding wires of a kind of low Cr VI discharge according to claim 1, it is characterized in that, in welding wire, metal-cored chemical composition mass percent is as follows: C:0.03 ~ 0.05wt.%; Cr:52 ~ 58wt.%; Ni:26 ~ 30wt.%; Mn:4 ~ 6wt.%; Si:0.66 ~ 1.5wt.%; Ti:0.5 ~ 1wt.%; Zn:0.5 ~ 1.5wt.%; Zr:0.5 ~ 1wt.%; Nb:0.5 ?1wt.%; Surplus is Fe and inevitable impurity.
3. stainless steel 347 metal core welding wires of a kind of low Cr VI discharge according to claim 1, it is characterized in that, metal-cored powder comprises: hafnium metal powfer: 40 ~ 120 orders, metal nickel powder: 40 ~ 120 orders, electrolytic manganese powder: 40 ~ 120 orders, ferrosilicon powder: 60 ~ 120 orders, titanium-iron powder: 60 ~ 120 orders, metal zinc: 60 ~ 120 orders, zirconium ferrosilicon powder: 60 ~ 120 orders, metal iron powder: 60 ~ 120 orders, ferro-niobium 60 ~ 120 order.
4. prepare the method for stainless steel 347 metal core welding wires of a kind of low Cr VI discharge as claimed in claim 1, it is characterized in that, described welding wire crust band is carbon steel steel band 8 × 0.4mm, metal core welding wire filling rate: 30% ~ 38%, the diameter 1.2mm of welding wire.
5. the stainless steel technique of 347 metal core welding wires of application a kind of low Cr VI discharge as claimed in claim 1, is characterized in that:
Adopt 95 ~ 98%Ar+2 ~ 5%O2 gas shielded to prepare deposition hardfacing alloy technique, welding condition is: voltage: 22 ~ 34V; Electric current: 160 ~ 260A; Wire feed rate: 350 ~ 500mm/min; Gas flow rate: 13 ~ 20L/min; Welding wire stretches out the distance of ignition tip: 14 ~ 25mm.
6. technique according to claim 5, is characterized in that:
Described welding condition is: voltage: 24 ~ 30V; Electric current: 200 ~ 260A; Wire feed rate: 400 ~ 500mm/min; Gas flow rate: 15 ~ 20L/min; Welding wire stretches out the distance of ignition tip: 15 ~ 22mm.
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| CN103480981B (en) * | 2013-09-22 | 2016-04-06 | 北京工业大学 | A kind of 347 stainless flux-cored wires of low Cr VI discharge |
| CN103480982B (en) * | 2013-09-22 | 2015-07-01 | 北京工业大学 | 316 stainless steel flux-cored wire low in hexavalent chromium discharge |
| PL3266560T3 (en) * | 2016-07-05 | 2019-08-30 | Ductil S.A. | Multi-coated electrode for welding stainless steel |
| US10799974B2 (en) | 2017-08-16 | 2020-10-13 | Lincoln Global, Inc. | Electrodes for forming austenitic and duplex steel weld metal |
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