WO2014034152A1 - フェライト系ステンレス鋼 - Google Patents
フェライト系ステンレス鋼 Download PDFInfo
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- WO2014034152A1 WO2014034152A1 PCT/JP2013/005208 JP2013005208W WO2014034152A1 WO 2014034152 A1 WO2014034152 A1 WO 2014034152A1 JP 2013005208 W JP2013005208 W JP 2013005208W WO 2014034152 A1 WO2014034152 A1 WO 2014034152A1
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Classifications
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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%
-
- 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
-
- 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
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C22C38/54—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a ferritic stainless steel that is excellent in surface quality, corrosion resistance, and workability, and that is suitable as a material for interior and exterior of buildings and materials for home appliance parts.
- Ferritic stainless steel is cheaper than austenitic stainless steel containing a large amount of expensive Ni, so it is a member for automobile exhaust systems, members for interior and exterior of buildings, kitchen equipment, washing machines, microwave ovens, etc. It is widely used as a member for home appliance parts.
- ferritic stainless steel mainly containing Ti has good workability and is cheaper than ferritic stainless steel mainly containing Nb, and therefore, uses are expanding.
- Patent Document 1 the amount of Ti and Mg is controlled to improve the cast structure, and a stainless steel plate having excellent formability and ridging resistance is obtained.
- Patent Document 2 discloses a technique for improving the corrosion resistance by controlling the composition of oxide inclusions to reduce scab-like surface defects and controlling the amount of Ni, Cu or Co. Is disclosed. It is disclosed that this technique can provide a stainless steel having a good surface property and excellent corrosion resistance and formability. Thus, compared with austenitic stainless steel, the properties of ferritic stainless steel, which has problems, are gradually improved, and the use tends to increase more and more.
- JP 2001-294991 A Japanese Unexamined Patent Publication No. 2000-1758
- Ti-precipitates mainly hard and coarsely deposited TiN
- streaks and white streaks on the steel sheet surface.
- the appearance of the product becomes a problem.
- the conventional technology has not yet overcome such surface quality problems.
- an object of the present invention is to provide a Ti-containing ferritic stainless steel excellent in surface quality, corrosion resistance and workability, which could not be achieved by the prior art.
- the present inventors investigated the relationship between the form of Ti-based precipitates in the Ti-containing ferritic stainless steel and the streaks and patterns on the surface of the steel sheet. The relationship between the precipitation forms of the system precipitates was examined in detail. At the same time, the effects of the component composition on the corrosion resistance and workability were also examined.
- the present invention has been made on the basis of the above knowledge, and the gist thereof is as follows.
- the soot component composition is mass%, C: 0.020% or less, Si: 0.15% or more, Ti ⁇ N ⁇ 100% or more, 0.50% or less, Mn: 0.05 to 0.40 %, P: 0.026 to 0.040%, S: 0.006% or less, Al: 0.01 to 0.15%, Cr: 16.0 to 19.0%, Ni: 0.05 to 0 50%, Ti: 10 ⁇ (C + N)% to 0.35%, Nb: 0.03% or less, N: 0.015% or less, Ca: 0.0003 to 0.0025%, B: 0.0001 Ferritic stainless steel characterized by containing ⁇ 0.0020%, the balance being Fe and inevitable impurities.
- the component composition is mass%, C: 0.003% to 0.012%, Al: 0.02 to 0.08%, Cr: 17.0 to 18.5%, N: The ferritic stainless steel according to [1], containing 0.010% or less and B: 0.0001 to 0.0010%.
- the component composition contains Si: 0.15% or more and Ti ⁇ N ⁇ 100% or more and 0.36% or less in mass%.
- the component composition is selected from the following, by mass: Cu: 0.01 to 0.14%, Mo: 0.01 to 0.14%, V: 0.01 to 0.20%.
- the present invention in addition to applications that mainly require workability and corrosion resistance, such as automobile exhaust system parts, it is used for interior and exterior members of buildings, kitchen appliances, washing machines, and household appliance parts such as microwave ovens. Among these members, it can be widely used as a member whose appearance is important. Also, TiN, which is the main cause of streaks and patterns generated on the surface of the steel sheet, is finely dispersed in the steel by controlling the component composition, so that it has been conventionally performed to remove TiN localized on the surface layer of the steel sheet. Maintenance such as grinding of the hot-rolled sheet that had been used is no longer necessary.
- C 0.020% or less Since C reduces corrosion resistance, it is made 0.020% or less. Desirably, it is 0.012% or less. On the other hand, in order to ensure strength, C is preferably contained in an amount of 0.001% or more. Therefore, C is preferably in the range of 0.001 to 0.020%. More preferably, it is in the range of 0.003 to 0.012%. More preferably, it is 0.005 to 0.012% of range.
- Ti and N in the above formula mean the content (mass%) of each element.
- Si has a function of refining and dispersing TiN, and is effective in reducing the surface flaws of the steel sheet caused by TiN. In order to obtain the effect, it is necessary to contain 0.15% or more and Ti ⁇ N ⁇ 100% or more. However, Si reduces the descalability of the hot-rolled sheet by pickling. In particular, when it contains more than 0.50%, the descaling property by pickling of a hot-rolled sheet is remarkably deteriorated, thereby inhibiting the production. For this reason, the amount of Si is made into the range of 0.15% or more and Ti ⁇ N ⁇ 100% or more and 0.50% or less. Preferably, it is 0.15% or more and Ti ⁇ N ⁇ 100% or more and 0.36% or less. More preferably, it is a range of 0.15% or more and Ti ⁇ N ⁇ 100% or more and 0.30% or less.
- Mn 0.05 to 0.40% Mn is effective as a deoxidizing element and contains 0.05% or more. However, if it exceeds 0.40%, Mn promotes the precipitation of MnS, which is the starting point of corrosion, and lowers the corrosion resistance. Therefore, the Mn content is in the range of 0.05 to 0.40%. Preferably it is 0.10 to 0.30% of range.
- P 0.026 to 0.040% P produces Fe and Ti and fine precipitates FeTiP, which causes a decrease in ductility. For this reason, the amount of P is made into 0.040% or less.
- the amount of P is desirably low, but in order to reduce P, the manufacturing cost is remarkably increased. Therefore, the P content is in the range of 0.026 to 0.040%.
- S 0.006% or less Since S forms sulfides with Ca and the like and deteriorates the corrosion resistance, the amount of S is made 0.006% or less.
- the S content is preferably 0.004% or less.
- the S content is preferably 0.002% or less.
- Al 0.01 to 0.15%
- Al is effective as a deoxidizing element. Furthermore, it is also effective in suppressing clogging of the casting nozzle during steel making, which is a problem with Ti-containing steel. For this reason, the Al content is 0.01% or more. The content is preferably 0.02% or more. However, when Al is contained in an amount exceeding 0.15%, coarse TiN is formed with an oxide mainly composed of Al 2 O 3 as a nucleus. Therefore, the Al content is in the range of 0.01 to 0.15%. Further, when the Al content is increased, the depth of penetration of the welded portion is lowered, and the workability of the welded portion is lowered. Therefore, the Al content is preferably 0.08% or less. Therefore, the preferable range of Al content is 0.02 to 0.08%.
- Cr 16.0 to 19.0% Cr is effective in improving the corrosion resistance, and in order to obtain good corrosion resistance, it is necessary to contain 16.0% or more. However, if the Cr content exceeds 19.0%, the workability decreases. Therefore, the Cr content is in the range of 16.0 to 19.0%. Preferably it is 17.0 to 18.5% of range.
- Ni 0.05 to 0.50%
- Ni is an element effective for improving corrosion resistance, and in order to obtain the effect, it is necessary to contain 0.05% or more. However, when Ni exceeds 0.50%, steel hardens
- Ti is an element effective for fixing C and N as carbonitrides and improving corrosion resistance and workability, and it is necessary to contain 10 ⁇ (C + N)% or more. However, if the content exceeds 0.35%, the workability is lowered, so the Ti content is in the range of 10 ⁇ (C + N)% to 0.35%. Preferably, it is 0.20 to 0.30% of range.
- Nb 0.03% or less
- the recrystallization temperature rises and the annealing temperature needs to be increased.
- the excessive addition of Nb increases the strength of the steel sheet, leading to a decrease in workability.
- the Nb content is 0.03% or less.
- it is 0.01% or less.
- N 0.015% or less
- N is an element that reduces corrosion resistance. Furthermore, N forms Ti and TiN and causes streaks and patterns on the surface of the steel sheet. Therefore, the N content is 0.015% or less. Preferably, it is 0.012% or less. More preferably, it is 0.010% or less. In order to reduce the amount of N to less than 0.004%, it is necessary to lengthen the refining time. Therefore, the N content is more preferably 0.005 to 0.012%.
- Ca 0.0003 to 0.0025%
- Ca is effective in controlling the oxide composition and preventing clogging of the casting nozzle in steelmaking. Therefore, the Ca content is 0.0003% or more. However, if Ca is contained in excess of 0.0025%, a sulfide is formed and becomes a starting point of rusting, and the corrosion resistance is lowered. Therefore, the Ca content is in the range of 0.0003 to 0.0025%. Preferably it is 0.0005 to 0.0020% of range.
- B 0.0001 to 0.0020%
- B content is 0.0001% or more.
- the B amount is set in the range of 0.0001 to 0.0020%. Preferably, it is in the range of 0.0002 to 0.0010%. More preferably, it is in the range of 0.0002 to 0.0005%.
- the above is the basic chemical component of the present invention, and the balance is composed of Fe and inevitable impurities, but can further contain one or more selected from Cu, Mo, and V from the viewpoint of improving corrosion resistance.
- Cu and Mo are effective in improving the corrosion resistance, and the contents of Cu and Mo are each 0.1%. 01% or more. However, if Cu and Mo are contained in amounts exceeding 0.14%, the workability is lowered. Therefore, when Cu is contained, the Cu content is preferably in the range of 0.01 to 0.14%. When Mo is contained, the amount of Mo is preferably in the range of 0.01 to 0.14%. More preferably, both Cu and Mo are in the range of 0.02 to 0.10%.
- V 0.01-0.20%
- V combines with C and N to suppress sensitization and improve corrosion resistance. This effect can be obtained by adding 0.01% or more. However, if the content exceeds 0.20%, the workability deteriorates. Therefore, when V is contained, the content is preferably in the range of 0.01 to 0.20%. More preferably, It is in the range of 0.01 to 0.10%. More preferably, it is in the range of 0.01 to 0.06%.
- secondary refining secondary refining (strong-stirring-vacuum-Oxygen-Decarburization) (SS-VOD) and argon-oxygen-decarburization (AOD) with a converter, electric furnace, etc.
- the steel having the above-mentioned preferred component composition is melted and made into a steel material (slab) by a continuous casting method or an ingot forming method.
- hot rolling is performed by heating to 1050 to 1200 ° C. to obtain a hot rolled steel sheet.
- cold rolling and finish annealing at 820 to 990 ° C. are performed to obtain a cold rolled steel sheet. .
- the casting temperature during casting is preferably 30 to 60 ° C. higher than the solidification temperature of the molten steel from the viewpoint of refinement and dispersion of TiN.
- the rolling reduction during cold rolling is preferably performed at a rolling reduction of 50% or more in order to ensure sufficient workability, particularly in order to ensure an elongation of 30% or more in a tensile test. Furthermore, when the elongation in the tensile test is ensured to be 32% or more, the rolling reduction is desirably 60% or more.
- the cold rolling may be performed once or twice or more including annealing in the middle.
- skin pass rolling and tension leveler may be applied within a range of 2.0% or less, preferably 1.0% or less, within a range where workability can be ensured.
- a ferritic stainless steel having the composition shown in Table 1-1 and Table 1-2 was cast at a solidification temperature of + 50 ° C. to obtain a 30 kg steel ingot.
- hot rolling was performed to obtain a hot-rolled steel plate having a thickness of 4.0 mm.
- annealing and pickling were performed at 950 ° C., and cold rolling was performed to obtain a plate thickness of 1.0 mm.
- finish annealing at 930 ° C. and pickling were performed, and five cold-rolled steel sheets each having a width of 20 cm and a length of 40 cm were produced for each ingot.
- the obtained cold-rolled steel sheet was observed for the presence or absence of streaks or patterns on the front and back surfaces.
- the case of ⁇ was evaluated as ⁇ A (passed, good), and the case of 4 or more was evaluated as ⁇ C (failed).
- Corrosion resistance was measured by preparing two 60 mm x 80 mm test pieces each having the surface of a cold rolled steel plate polished with emery polishing paper # 600, and salt water according to JIS (Japanese Industrial Standards) Z 2371 (2000).
- a spray test (SST) test (SST) was performed for evaluation.
- the salt spray test was carried out for 4 hours by spraying a 5 mass% NaCl solution at 35 ° C., and then using an optical microscope, the number of rust points of 0.5 mm ⁇ or more was counted, and the total number of each two sheets evaluated.
- the case where the rusting point was 0 was evaluated as ⁇ AA (passed, very good)
- the case of 1 to 4 was evaluated as ⁇ A (passed, good)
- the case of 5 or more was evaluated as ⁇ C (failed).
- the present invention in addition to uses that require mainly workability and corrosion resistance such as automobile exhaust system parts, it is used for interior and exterior members of buildings, kitchen appliances, washing machines, and household appliance parts such as microwave ovens. It can be widely used for members whose appearance is important among the members.
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Abstract
Description
はじめに、本発明の鋼の成分組成を規定した理由を説明する。なお、成分%は、全て質量%を意味する。
Cは耐食性を低下させるため、0.020%以下とする。望ましくは、0.012%以下である。一方、強度を確保するためには、Cは0.001%以上含有することが望ましい。よって、Cは0.001~0.020%の範囲が好ましい。より好ましくは0.003~0.012%の範囲である。更に好ましくは0.005~0.012%の範囲である。
なお、上記式中のTi、Nはそれぞれの元素の含有量(質量%)を意味する。
Mnは脱酸元素として有効であり0.05%以上含有する。しかし、0.40%を超えて含有すると、Mnは腐食の起点となるMnSの析出を促進し、耐食性を低下させる。よって、Mn量は0.05~0.40%の範囲とする。好ましくは0.10~0.30%の範囲である。
PはFeおよび、Tiと微細な析出物FeTiPを生成し延性の低下の原因となる。このため、P量は0.040%以下とする。P量は低いことが望ましいが、Pを低減させるためには製造コストが著しく増加するため、0.026%以上とする。よって、P量は0.026~0.040%の範囲とする。
SはCa等と硫化物を形成し耐食性を劣化させるため、S量は0.006%以下とする。なお、Caを0.0015%以上含有する場合は、S量は0.004%以下とすることが好ましい。Caを0.0020%以上含有する場合には、S量は0.002%以下とすることが好ましい。
Alは脱酸元素として有効である。さらに、Ti含有鋼で問題となる製鋼時の鋳造ノズルの閉塞を抑制するのにも有効である。このため、Al量は0.01%以上の含有とする。好ましくは0.02%以上の含有である。しかし、Alを0.15%を超えて含有すると、Al2O3を主体とする酸化物を核として粗大なTiNが形成される。従って、Al量は0.01~0.15%の範囲とする。また、Alの含有量が増加すると溶接部の溶込み深さ(depth of penetration)が低下し、溶接部の加工性が低下するため、Al量は0.08%以下とするのが好ましい。よって、好ましいAl量の範囲は、0.02~0.08%である。
Crは耐食性の改善に有効であり、良好な耐食性を得るためには、16.0%以上の含有が必要である。しかし、Crを19.0%を超えて含有すると加工性が低下する。よって、Cr量は16.0~19.0%の範囲とする。好ましくは17.0~18.5%の範囲である。
Niは耐食性の向上に有効な元素であり、その効果を得るためには、0.05%以上の含有が必要である。しかし、Niを0.50%を超えて含有すると、鋼が硬化し、延性が低下する。また、Niは高価な元素である。よって、Ni量は0.05~0.50%の範囲とする。好ましくは0.20~0.50%の範囲である。
なお、C、Nはそれぞれの元素の含有量(質量%)を意味する。
Nbは、過剰に添加すると再結晶温度が上昇し、焼鈍温度を高温にする必要がある。また、Nbの過剰に添加により、鋼板の強度が増加し、加工性の低下を招く。このため、Nb量は0.03%以下とする。好ましくは0.01%以下である。
Nは、Cと同様に、耐食性を低下させる元素である。さらに、NはTiとTiNを形成し、鋼板表面の筋状の疵や模様の原因となる。このため、N量は0.015%以下とする。好ましくは、0.012%以下である。さらに好ましくは0.010%以下である。N量を0.004%未満にまで低減するには精錬時間を長くする必要があり、製造コストの上昇および生産性の低下を招くため好ましくない。したがって、N量は0.005~0.012%がより好ましい。
Caは、酸化物の組成を制御し、製鋼における鋳造ノズルの閉塞を防止するのに有効である。よって、Caは0.0003%以上の含有とする。しかし、0.0025%を超えてCaを含有すると、硫化物を形成して発錆の起点となり、耐食性を低下させる。従って、Ca量は0.0003~0.0025%の範囲とする。好ましくは0.0005~0.0020%の範囲である。
Bは、熱間加工性の向上や二次加工脆化(secondary cold-work embrittlement)を防止するのに有効である。よって、Bは0.0001%以上の含有とする。しかし、Bを0.0020%を超えて含有すると、熱間加工性が低下する。従って、B量は0.0001~0.0020%の範囲とする。好ましくは、0.0002~0.0010%の範囲である。より好ましくは、0.0002~0.0005%の範囲である。
Cu、Moは耐食性の向上に有効であり、Cu、Moの含有量はそれぞれ0.01%以上とする。しかし、Cu、Moはそれぞれ0.14%を超えて含有すると加工性が低下する。よって、Cuを含有する場合は、Cu量は0.01~0.14%の範囲とするのが好ましい。Moを含有する場合は、Mo量は0.01~0.14%の範囲とするのが好ましい。より好ましくは、Cu、Moのいずれも0.02~0.10%の範囲である。
VはC、Nと結合して鋭敏化を抑制して耐食性を向上させる。この効果は0.01%以上の添加で得られる。しかし、0.20%を超えて含有すると加工性が低下するため、Vを含有する場合は、0.01~0.20%の範囲とするのが好ましい。より好ましくは、
0.01~0.10%の範囲である。さらに好ましくは、0.01~0.06%の範囲である。
次に本発明鋼の好適製造方法について説明する。
一方、Siが0.06%と請求の範囲より低いNo.9、Si含有量がTi×N×100%より低いNo.10、No.14、No.16、No.24は表面品質が不合格であった。さらに、Al含有量が0.16%と請求の範囲より高いNo.13およびSi含有量が0.51%と請求の範囲より高いNo.23も表面品質が不合格であった。
さらに、Nb含有量が0.05%と請求の範囲より高いNo.21、Ti含有量が0.39%あるいは0.38%と請求の範囲より高いNo.15およびはNo.22は加工性が不合格であった。
Claims (5)
- 成分組成が、質量%で、C:0.020%以下、Si:0.15%以上かつTi×N×100%以上、0.50%以下、Mn:0.05~0.40%、P:0.026~0.040%、S:0.006%以下、Al:0.01~0.15%、Cr:16.0~19.0%、Ni:0.05~0.50%、Ti:10×(C+N)%~0.35%、Nb:0.03%以下、N:0.015%以下、Ca:0.0003~0.0025%、B:0.0001~0.0020%を含有し、残部がFeおよび不可避的不純物から成ることを特徴とするフェライト系ステンレス鋼。
- 更に、成分組成が、質量%で、C:0.003%以上0.012%以下、Al:0.02~0.08%、Cr:17.0~18.5%、N:0.010%以下、B:0.0001~0.0010%を含有することを特徴とする請求項1に記載のフェライト系ステンレス鋼。
- 更に、成分組成が、質量%で、Si:0.15%以上かつTi×N×100%以上、0.36%以下を含有することを特徴とする請求項1または2に記載のフェライト系ステンレス鋼。
- 更に、成分組成が、質量%で、Cu:0.01~0.14%、Mo:0.01~0.14%、V:0.01~0.20%の中から選ばれる一種以上を含有することを特徴とする請求項1乃至3の何れか1項に記載のフェライト系ステンレス鋼。
- 更に、成分組成が、質量%で、V:0.01~0.10%を含有することを特徴とする請求項4に記載のフェライト系ステンレス鋼。
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