WO2016017053A1 - プラズマ溶接用フェライト系ステンレス鋼板およびその溶接方法 - Google Patents
プラズマ溶接用フェライト系ステンレス鋼板およびその溶接方法 Download PDFInfo
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- WO2016017053A1 WO2016017053A1 PCT/JP2015/002400 JP2015002400W WO2016017053A1 WO 2016017053 A1 WO2016017053 A1 WO 2016017053A1 JP 2015002400 W JP2015002400 W JP 2015002400W WO 2016017053 A1 WO2016017053 A1 WO 2016017053A1
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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
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
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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
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Definitions
- the present invention relates to a ferritic stainless steel sheet used for plasma welding and a welding method thereof.
- Patent Document 1 discloses a martensitic stainless steel containing 7 to 14 mass% Cr in which Al, P, S and O are regulated for fusion welding such as plasma welding.
- austenitic stainless steel represented by SUS304 has been conventionally used.
- austenitic stainless steel has a drawback that stress corrosion cracking is likely to occur, and there are many applications in which ferritic stainless steel that is less susceptible to stress corrosion cracking is used. For this reason, it is required to perform plasma keyhole welding also on ferritic stainless steel.
- Patent Document 2 discloses a welding method in which a ferritic stainless steel having a thickness of 3 mm or less is non-keyhole welded using a plasma welding torch. Therefore, this method is not for performing keyhole welding.
- ferritic stainless steel has good thermal conductivity and heat is easily diffused. Therefore, it is necessary to increase the amount of heat input in arc welding such as TIG welding. However, when the amount of heat input is increased by plasma keyhole welding, the amount of melting increases and burnout may occur.
- the present invention has been completed in order to solve the above-mentioned problems, and an object of the present invention is to provide a ferritic stainless steel sheet that is less melted and has excellent plasma weldability.
- the present invention optimizes the steel components and prevents melting.
- the present inventors have reduced the amount of O in steel as much as possible, added Al and Ca that are easily combined with O, and added O to Al 2 O 3 and CaO. As a result, it was found that the occurrence of burn-out can be suppressed.
- the present invention has been made based on the above findings, and the gist thereof is as follows.
- burn-through is reduced and high-quality plasma welding can be performed on a ferritic stainless steel sheet.
- the ferritic stainless steel sheet according to the present invention has a mass composition of C: 0.020% or less, Si: 0.6% or less, Mn: 0.5% or less, P: 0.04% or less. S: 0.010% or less, Al: 0.015% or more, 0.20% or less, Cr: 17.0% or more and 24.0% or less, Ni: less than 0.6%, N: 0.020%
- Ca 0.0002% or more, 0.0020% or less, O: 0.0050% or less, Ti: 0.01% or more, 0.45% or less, Nb: 0.01% From the above, it further contains one or two selected from 0.55% or less, and consists of the balance Fe and other inevitable impurities, and (Ti + Nb ⁇ 48/93) / (C + N) ⁇ 8.0 (in the formula, Ti , Nb, C, and N represent the content (mass%) of each element.
- the ferritic stainless steel sheet according to the present invention is excellent in corrosion resistance.
- ferritic stainless steel sheet of the present invention is used for plasma welding.
- the ferritic stainless steel plate of the present invention can be used for plasma keyhole welding because high quality plasma welding is possible.
- the steel sheet of the present invention the reasons for limiting the components of the ferritic stainless steel sheet of the present invention (hereinafter referred to as “the steel sheet of the present invention”) will be described.
- “%” of each component in the steel sheet of the present invention indicates “mass%” unless otherwise specified.
- C is an element that decreases the workability and toughness of the steel sheet. If the C content exceeds 0.020%, the adverse effect becomes significant, so the C content is limited to 0.020% or less. In particular, from the viewpoint of improving workability and toughness, the C content is preferably 0.017% or less. Further, the C content is more preferably 0.012% or less.
- Si is an element necessary as a deoxidizer. The effect is acquired by making it contain 0.01% or more. Therefore, the Si content is preferably 0.01% or more. However, if Si is contained in excess of 0.6%, it is oxidized at the time of annealing to form a SiO 2 film on the surface of the steel sheet, thereby reducing the pickling property. Therefore, the Si content is set to 0.6% or less. Furthermore, from the viewpoint of improving pickling properties, the Si content is preferably 0.30% or less.
- Mn is an element necessary as a deoxidizer. The effect is acquired by making it contain 0.01% or more. Therefore, the Mn content is preferably 0.01% or more. However, when Mn is contained exceeding 0.5%, the workability of the steel sheet is lowered. Therefore, the Mn content is 0.5% or less. Furthermore, from the viewpoint of improving workability, the Mn content is preferably 0.30% or less.
- P is an element that lowers the workability and toughness of the steel sheet, and is preferably as small as possible.
- the P content is 0.04% or less.
- S is an element that lowers toughness, and is preferably as small as possible, and the S content is 0.010% or less. From the viewpoint of improving toughness, the S content is preferably 0.007% or less.
- Al 0.015% or more, 0.20% or less
- Al is necessary for improving plasma weldability, which is a feature of the present invention.
- the Al content is less than 0.015%, the amount of O that is not fixed as Al 2 O 3 or CaO in the steel will increase, and it will not be possible to suppress the occurrence of burnout.
- the Al content is preferably 0.020% or more.
- the Al content is preferably 0.15% or less.
- Cr 17.0% or more and 24.0% or less
- Cr is an elemental component effective for improving corrosion resistance, and a content of 17.0% or more is necessary to obtain sufficient corrosion resistance. Further, from the viewpoint of improving the corrosion resistance, the Cr content is preferably 20.5% or more. On the other hand, Cr lowers the toughness of the steel sheet. In particular, when the Cr content exceeds 24.0%, the toughness is significantly lowered, so the Cr content is limited to 24.0% or less. From the viewpoint of improving toughness, the Cr content is preferably 22.0% or less.
- Ni has the effect of improving corrosion resistance and toughness, but the raw material cost is high, so the Ni content is less than 0.6%. From the viewpoint of corrosion resistance and toughness, the Ni content is preferably 0.10% or more. On the other hand, when the Ni content exceeds 0.40%, the effect of improving the corrosion resistance is saturated. Therefore, from the economical viewpoint, the Ni content is preferably set to 0.40% or less.
- N is an element that lowers the workability and toughness of the steel sheet in the same manner as C.
- N content exceeds 0.020%, its adverse effect becomes significant, so it is limited to 0.020% or less.
- the N content is preferably 0.015% or less, and more preferably 0.012% or less.
- Ca 0.0002% or more and 0.0020% or less
- Ca is necessary for improving plasma weldability, which is a feature of the present invention.
- the Ca content is less than 0.0002%, the amount of O that is not fixed as Al 2 O 3 or CaO in the steel. Therefore, it becomes impossible to suppress the occurrence of melt-off, so the content is made 0.0002% or more and preferably 0.0005% or more.
- the Ca content exceeds 0.0020%, not only the effect is saturated, but also Ca becomes inclusions, and the surface quality of the steel sheet is lowered by generating lashes. Therefore, the Ca content is 0.0020% or less. From the viewpoint of improving the surface quality, the Ca content is preferably 0.0015% or less.
- the steel plate of the present invention contains at least one of Ti and Nb as an essential component.
- Ti and Nb form carbonitrides, and Cr has the effect of suppressing the sensitization phenomenon that combines with carbon and nitrogen to reduce corrosion resistance.
- Ti, Nb, C and N in formula (1) indicate the content (% by mass) of each element).
- Ti and Nb are contained excessively, not only the suppression effect of sensitization is saturated, but also the toughness is reduced, so the Ti content is 0.45% or less and the Nb content is 0.55.
- the Ti content is preferably 0.35% or less and the Nb content is preferably 0.45% or less.
- the Ti content is 0.01% or more, preferably 0.20% or more.
- the Nb content is 0.01% or more, preferably 0.10% or more.
- the left side of the formula (1) is preferably 12.0 or more.
- the balance other than the above components of the steel sheet of the present invention is Fe and inevitable impurities.
- Mo, Cu, Co, V, Zr and B are not essential components but can be contained in the following ranges.
- Mo 0.01% or more and 2.0% or less
- Mo is an element effective for improving the corrosion resistance, and is contained as necessary. The effect is acquired because Mo content is 0.01% or more. From the viewpoint of improving the corrosion resistance, the Mo content is preferably 0.40% or more. However, if the Mo content exceeds 2.0%, not only the effect of improving the corrosion resistance is saturated, but also the toughness is lowered, so the Mo content is set to 2.0% or less. From the viewpoint of improving toughness, the Mo content is preferably 1.5% or less.
- Cu 0.01% or more, 1.0% or less
- Cu is an element component that is particularly effective for improving corrosion resistance, and is contained as necessary. The effect is acquired because Cu content is 0.01% or more. However, if the Cu content exceeds 1.0%, not only the effect is saturated but also the toughness may be lowered, so the Cu content is set to 1.0% or less. From the viewpoint of improving toughness, the Cu content is preferably 0.60% or less. In order to obtain a sufficient effect of improving corrosion resistance, the Cu content is preferably 0.20% or more.
- Co 0.01% or more, 0.2% or less
- Co is an element that improves toughness, and is contained as necessary. This effect is obtained when the content is 0.01% or more. On the other hand, if the Co content exceeds 0.2%, productivity may be reduced. Therefore, when Co is contained in the steel sheet of the present invention, the Co content is in the range of 0.01 to 0.2%.
- V 0.01 to 0.10%
- V is an element that enhances workability by being contained in a trace amount, and is contained as required. The effect is acquired because V content is 0.01% or more. However, if the V content exceeds 0.10%, the workability improvement effect is saturated, so the V content is 0.10% or less.
- Zr 0.01 to 0.10%
- Zr is an element that enhances workability by being contained in a small amount, and is contained as necessary. The effect is acquired because Zr content is 0.01% or more. However, if the Zr content exceeds 0.10%, the workability improvement effect is saturated, so the Zr content is set to 0.10% or less.
- B is an element effective for preventing embrittlement at low temperature secondary processing, and is contained as necessary. In order to obtain this effect, 0.0002% or more of B must be contained. However, when the B content exceeds 0.0050%, the hot workability may decrease. Therefore, when it contains B, it is made into 0.0002% or more and 0.0050% or less. Moreover, it is preferable that B content shall be 0.0005% or more from a viewpoint of prevention of low temperature secondary work embrittlement. Further, the B content is preferably 0.0035% or less, and more preferably 0.0020% or less, from the viewpoint of improving hot workability.
- the method for producing the steel sheet of the present invention is not particularly limited except that the composition of the molten steel is adjusted as described above at the stage of molten steel, and the method generally employed for the production of ferritic stainless steel sheet is used as it is. Can be applied. Preferred production conditions in the production method will be described below.
- the steel melted in a converter or an electric furnace is secondarily refined by a VOD method or the like, and the steel contains the above essential components and components added as necessary.
- the molten steel can be made into a steel material (slab) by a known method, it is preferable to use a continuous casting method in terms of productivity and quality.
- the steel material is heated to 1000 to 1250 ° C. and is hot rolled into a hot rolled sheet having a desired thickness.
- the hot-rolled sheet thus obtained may then be subjected to continuous annealing at a temperature of 850 to 1100 ° C. and then descaled by pickling or the like to obtain a hot-rolled annealed sheet.
- the cooling rate after annealing is not particularly limited, but it is desirable to cool in as short a time as possible. If necessary, the scale may be removed by shot blasting before pickling.
- the hot-rolled annealed plate or hot-rolled plate may be a cold-rolled product through a process such as cold rolling.
- the cold rolling may be performed once, but may be performed twice or more with intermediate annealing in view of productivity and required quality.
- the total rolling reduction of the cold rolling process once or twice is preferably 60% or more, more preferably 70% or more.
- the cold-rolled steel sheet is then preferably subjected to continuous annealing (finish annealing) at a temperature of preferably 850 to 1150 ° C., more preferably 900 to 1100 ° C., pickling, and forming a cold-rolled product.
- finish annealing continuous annealing
- the cooling rate after annealing is not particularly limited, but is desirably as large as possible.
- skin pass rolling or the like may be performed to adjust the shape, surface roughness, and material quality of the steel sheet.
- welding current 50 to 400 A
- voltage 10 to 40 V
- welding speed 50 to 600 mm / min
- constraining nozzle diameter 1.0 to 5.0 mm
- pilot gas (Ar ) Flow rate: 0.1 to 5.0 l / min
- shield gas flow rate 4 to 40 l / min.
- a cold-rolled sheet serving as a test material was obtained by the following method.
- a 50 kg steel ingot having the chemical composition shown in Table 1 below is melted in a vacuum melting furnace, heated to 1200 ° C. and then hot-rolled by a reverse rolling mill to be 6 mm thick, and annealed at 950 to 1000 ° C. Then, it was descaled by pickling to obtain a hot-rolled annealed plate (hot-rolled pickled plate).
- the hot-rolled annealed sheet was made into a sheet thickness of 3.0 mm by cold rolling, and after finish annealing at 880 to 970 ° C., it was mixed with 60 ° C. mixed acid (nitric acid 10 mass% + hydrofluoric acid 3 mass%). It was immersed and descaled to obtain a cold rolled sheet.
- welding conditions A are as shown below.
- the welding condition B is the same condition Welding was also performed.
- the inventive example did not melt, whereas the comparative example had melted.
- the O component in the steel sheet is 0.0040% or less, so it does not melt in any of welding conditions A and B, and has excellent plasma weldability. I found out.
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Abstract
Description
[1]質量%で、C:0.020%以下、Si:0.6%以下、Mn:0.5%以下、P:0.04%以下、S:0.010%以下、Al:0.015%以上、0.20%以下、Cr:17.0%以上、24.0%以下、Ni:0.6%未満、N:0.020%以下、Ca:0.0002%以上、0.0020%以下、O:0.0050%以下、を含有し、
Ti:0.01%以上、0.45%以下、Nb:0.01%以上、0.55%以下から選ばれる1種または2種を更に含有し、残部Fe及びその他不可避的不純物からなり、(Ti+Nb×48/93)/(C+N)≧8.0(式中のTi、Nb、CおよびNは、各元素の含有量(質量%)を示す。)を満たすプラズマ溶接用フェライト系ステンレス鋼板。
[2]質量%で、Mo: 0.01%以上、2.0%以下、Cu: 0.01%以上、1.0%以下、Co:0.01%以上、0.2%以下、のうちから選ばれる1種または2種以上を含有する前記[1]に記載のプラズマ溶接用フェライト系ステンレス鋼板。
[3]質量%で、V:0.01%以上、0.10%以下、Zr:0.01%以上、0.10%以下、B:0.0002%以上、0.0050%以下、の1種または2種以上を含有する前記[1]または[2]に記載のプラズマ溶接用フェライト系ステンレス鋼板。
[4]キーホール溶接に用いられる前記[1]~[3]のいずれか1つに記載のプラズマ溶接用フェライト系ステンレス鋼板。
[5]前記[1]~[3]のいずれか1つに記載のプラズマ溶接用フェライト系ステンレス鋼板をプラズマキーホール溶接に用いるプラズマキーホール溶接方法。
Cは、鋼板の加工性および靱性を低下させる元素であり、C含有量が0.020%を超えると、その悪影響が顕著となるので、C含有量は0.020%以下に限定する。特に、加工性および靱性の向上の観点から、C含有量は0.017%以下とすることが好ましい。また、C含有量は0.012%以下とすることがより好ましい。
Siは、脱酸剤として必要な元素である。その効果は0.01%以上含有させることで得られる。よって、Si含有量は0.01%以上とすることが好ましい。しかし、0.6%を超えてSiを含有させると焼鈍時に酸化して鋼板の表面にSiO2皮膜を形成して酸洗性を低下させる。よって、Si含有量は0.6%以下とする。更に、酸洗性の向上の観点から、Si含有量は0.30%以下とすることが好ましい。
Mnは、脱酸剤として必要な元素である。その効果は0.01%以上含有させることで得られる。よって、Mn含有量は0.01%以上とすることが好ましい。しかし、0.5%を超えてMnを含有させると鋼板の加工性を低下させる。よって、Mn含有量は0.5%以下とする。更に、加工性の向上の観点から、Mn含有量は0.30%以下とすることが好ましい。
Pは、鋼板の加工性および靭性を低下させる元素であり、出来る限り少ない方が好ましく、P含有量は0.04%以下とする。
Sは、靭性を低下させる元素であり、出来る限り少ない方が好ましく、S含有量は0.010%以下とする。靭性の向上の観点から、S含有量を0.007%以下にすることが好ましい。
Alは、本発明の特徴であるプラズマ溶接性の向上のために必要である。Al含有量は、0.015%未満であると、鋼中でAl2O3やCaOとして固定されないOの量が多くなって溶け落ちの発生を抑えることができなくなるため、0.015%以上とする。また、溶け落ち発生の抑制の観点から、Al含有量は0.020%以上とすることが好ましい。しかしながら、Alを過剰に含有するとAl2O3介在物が過度に生成しヘゲ疵等の発生により鋼板の表面品質が低下するため、Al含有量は0.20%以下に限定する。表面品質の向上の観点からは、Al含有量は0.15%以下とすることが好ましい。
Crは耐食性の向上に有効な元素成分であり、十分な耐食性を得るためには17.0%以上の含有量が必要である。また、耐食性の向上の観点から、Cr含有量は20.5%以上とすることが好ましい。一方、Crは鋼板の靱性を低下させ、特にCr含有量が24.0%を超えると靱性の低下が著しくなるため、Cr含有量は24.0%以下に限定する。靱性の向上の観点から、Cr含有量は22.0%以下とすることが好ましい。
Niは、耐食性および靭性を向上させる効果を持つが、原料コストが高いため、Ni含有量は0.6%未満とする。耐食性および靭性の観点からは、Ni含有量は0.10%以上とすることが好ましい。一方、Ni含有量が0.40%を超えると耐食性の向上効果は飽和するため、経済性の観点から、Ni含有量は0.40%以下とすることが好ましい。
Nは、Cと同様に鋼板の加工性および靱性を低下させる元素であり、N含有量が0.020%を超えるとその悪影響が顕著となるので、0.020%以下に限定する。特に、加工性および靱性の向上の観点から、N含有量は0.015%以下とすることが好ましく、0.012%以下とすることがより好ましい。
Caは、本発明の特徴であるプラズマ溶接性の向上のために必要であり、Ca含有量は、0.0002%未満であると、鋼中でAl2O3やCaOとして固定されないOの量が多くなって溶け落ちの発生を抑えることができなくなるため、0.0002%以上とし、0.0005%以上とすることが好ましい。しかしながら、Ca含有量が0.0020%を超えると、その効果が飽和するばかりでなく、Caが介在物となり、ヘゲ疵を発生させることで鋼板の表面品質を低下させる。そのため、Ca含有量は0.0020%以下とする。また、表面品質の向上の観点から、Ca含有量は0.0015%以下とすることが好ましい。
本発明の鋼板は、TiおよびNbの少なくとも一方は必須成分として含有する。TiおよびNbは炭窒化物を形成し、Crが炭素および、窒素と結びついて耐食性を低下させる鋭敏化現象を抑制する効果があるため、
(Ti+Nb×48/93)/(C+N)≧8.0 ・・・(1)
を満たすようにする(式(1)中のTi、Nb、CおよびNは、各元素の含有量(質量%)を示す。)。しかし、TiおよびNbを過度に含有しても、鋭敏化の抑制効果が飽和するだけでなく、靭性の低下を招くため、Ti含有量は0.45%以下および、Nb含有量は0.55%以下とする。特に、靭性の向上の観点からはTi含有量は0.35%以下および、Nb含有量は0.45%以下とすることが好ましい。また、鋭敏化の抑制の観点からは、上記(1)式を満たすとともに、Tiを含有する場合、Ti含有量は0.01%以上とし、好ましくは0.20%以上とする。Nbを含有する場合には、Nb含有量は0.01%以上とし、好ましくは0.10%以上とする。さらに、鋭敏化の抑制の観点から、上記(1)式の左辺は12.0以上であることが好ましい。
鋼中のO量低減は、本発明の溶け落ちを軽減するという効果を得るために必須であり、Oの含有量を0.0050%以下とすることで、その溶け落ちを軽減するという効果が得られる。O含有量は0.0040%以下にするとその効果は大きくなり、さらに0.0030%以下にするとよりその効果はより大きくなる。
Moは耐食性の向上に有効な元素であり、必要に応じて含有させる。Mo含有量が0.01%以上であることで、その効果は得られる。耐食性の向上の観点から、Mo含有量は0.40%以上にすることが好ましい。しかし、Mo含有量が2.0%を超えると、耐食性向上の効果が飽和するばかりでなく、靱性を低下させるため、Mo含有量は2.0%以下とする。靭性の向上の観点からは、Mo含有量は1.5%以下とすることが好ましい。
Cuは、耐食性向上に特に有効な元素成分であり、必要に応じて含有させる。Cu含有量が0.01%以上であることで、その効果が得られる。しかし、Cu含有量が1.0%を超えると、その効果が飽和するばかりでなく、靱性を低下させる場合があるため、Cu含有量は1.0%以下とする。靭性の向上の観点からは、Cu含有量は0.60%以下とすることが好ましい。十分な耐食性改善効果を得るためには、Cu含有量は0.20%以上とすることが好ましい。
Coは靭性を向上させる元素であり、必要に応じて含有させる。この効果は0.01%以上の含有によって得られる。一方、Co含有量が0.2%を超えると製造性を低下させる場合がある。そのため、本発明の鋼板にCoを含有させる場合、Co含有量は0.01~0.2%の範囲とする。
Vは微量含有させることにより加工性を高くする元素であり、必要に応じて含有させる。V含有量が0.01%以上であることで、その効果は得られる。しかし、V含有量が0.10%を超えると加工性の向上効果は飽和するため、V含有量は、0.10%以下とする。
Zrは微量含有させることにより加工性を高くする元素であり、必要に応じて含有させる。Zr含有量が0.01%以上であることで、その効果は得られる。しかし、Zr含有量が0.10%を超えると加工性の向上効果は飽和するため、Zr含有量は、0.10%以下とする。
Bは低温二次加工脆化を防止するのに有効な元素であり、必要に応じて含有させる。この効果を得るためには0.0002%以上のBの含有が必要である。しかし、B含有量が0.0050%を超えると熱間加工性が低下する場合がある。そのため、Bを含有する場合は0.0002%以上、0.0050%以下とする。また、B含有量は、低温二次加工脆化の防止の観点から、0.0005%以上とすることが好ましい。また、B含有量は、熱間加工性の向上の観点から、0.0035%以下とすることが好ましく、さらに、0.0020%以下であることがより好ましい。
本発明の鋼板を製造する方法は、溶鋼の段階で上述のように溶鋼の組成を成分調整する以外は、特に限定されず、フェライト系ステンレス鋼板の製造に一般的に採用されている方法をそのまま適用することができる。
上記製造方法における、好ましい製造条件について以下説明する。
実施例として、以下の方法で供試材となる冷延板を得た。
以下の表1に示す化学組成を有する50kg鋼塊を真空溶解炉で溶製し、1200℃に加熱後リバース圧延機による熱間圧延により厚さ6mmの熱延板とし、950~1000℃で焼鈍した後、酸洗で脱スケールし熱延焼鈍板(熱延酸洗板)とした。次にその熱延焼鈍板を、冷間圧延により板厚3.0mmとし、880~970℃での仕上げ焼鈍を行った後、60℃の混酸(硝酸10質量%+ふっ酸3質量%)に浸漬して脱スケールし、冷延板を得た。
溶接条件(溶接条件A)は以下に示す通りである。
フローニアス社製プラズマ溶接機
溶接電流:250A
溶接速度:260mm/分
板とチップ間の距離:3mm
拘束ノズル径:3.2mm
パイロットガス:Ar、0.2l/分
シールドガス:Ar、25l/分
ワイヤ:不使用
また、上記の溶接条件Aと比べ、溶接電流を270Aとした以外は、同一の条件である溶接条件Bによる溶接も行った。
◎:溶接電流が270A、250Aの双方で溶け落ち欠陥が発生しなかった。
○:溶接電流が270Aの場合では、溶け落ち欠陥が発生することもあったが、250Aの場合では、溶け落ち欠陥が発生しなかった。
×:溶接電流が270A、250Aの双方で溶け落ち欠陥が発生した。
Claims (5)
- 質量%で、
C:0.020%以下、
Si:0.6%以下、
Mn:0.5%以下、
P:0.04%以下、
S:0.010%以下、
Al:0.015%以上、0.20%以下、
Cr:17.0%以上、24.0%以下、
Ni:0.6%未満、
N:0.020%以下、
Ca:0.0002%以上、0.0020%以下、
O:0.0050%以下、を含有し、
Ti:0.01%以上、0.45%以下、Nb:0.01%以上、0.55%以下から選ばれる1種または2種を更に含有し、
残部Fe及びその他不可避的不純物からなり、
(Ti+Nb×48/93)/(C+N)≧8.0 ・・・(1)
(式(1)中のTi、Nb、CおよびNは、各元素の含有量(質量%)を示す。)
を満たすプラズマ溶接用フェライト系ステンレス鋼板。 - 質量%で、
Mo:0.01%以上、2.0%以下、
Cu:0.01%以上、1.0%以下、
Co:0.01%以上、0.2%以下、のうちから選ばれる1種または2種以上を含有する請求項1に記載のプラズマ溶接用フェライト系ステンレス鋼板。 - 質量%で、
V:0.01%以上、0.10%以下、
Zr:0.01%以上、0.10%以下、
B:0.0002%以上、0.0050%以下、の1種または2種以上を含有する請求項1または2に記載のプラズマ溶接用フェライト系ステンレス鋼板。 - キーホール溶接に用いられる請求項1~3のいずれか1項に記載のプラズマ溶接用フェライト系ステンレス鋼板。
- 請求項1~3のいずれか1項に記載のプラズマ溶接用フェライト系ステンレス鋼板をプラズマキーホール溶接に用いるプラズマキーホール溶接方法。
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| KR1020177002374A KR20170018457A (ko) | 2014-07-31 | 2015-05-12 | 플라즈마 용접용 페라이트계 스테인리스 강판 및 그 용접 방법 |
| CN201580041326.1A CN106574339A (zh) | 2014-07-31 | 2015-05-12 | 等离子弧焊用铁素体系不锈钢板及其焊接方法 |
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Also Published As
| Publication number | Publication date |
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| TWI567209B (zh) | 2017-01-21 |
| US20170266751A1 (en) | 2017-09-21 |
| JPWO2016017053A1 (ja) | 2017-04-27 |
| CN106574339A (zh) | 2017-04-19 |
| TW201610184A (zh) | 2016-03-16 |
| JP5874864B1 (ja) | 2016-03-02 |
| US10272513B2 (en) | 2019-04-30 |
| KR20170018457A (ko) | 2017-02-17 |
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