WO2011093516A1 - 靭性に優れた高耐食性フェライト系ステンレス熱延鋼板 - Google Patents

靭性に優れた高耐食性フェライト系ステンレス熱延鋼板 Download PDF

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Publication number
WO2011093516A1
WO2011093516A1 PCT/JP2011/052187 JP2011052187W WO2011093516A1 WO 2011093516 A1 WO2011093516 A1 WO 2011093516A1 JP 2011052187 W JP2011052187 W JP 2011052187W WO 2011093516 A1 WO2011093516 A1 WO 2011093516A1
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less
steel sheet
hot
toughness
stainless steel
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PCT/JP2011/052187
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English (en)
French (fr)
Japanese (ja)
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寒川孝
井手信介
加藤康
宇城工
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Ｊｆｅスチール株式会社
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Priority to CN201180007210.8A priority Critical patent/CN102725432B/zh
Priority to KR1020127020446A priority patent/KR101463526B1/ko
Publication of WO2011093516A1 publication Critical patent/WO2011093516A1/ja

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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
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium

Definitions

  • the present invention relates to a high-corrosion resistance hot rolled stainless steel sheet having high toughness and high corrosion resistance ferritic stainless steel.
  • SUS304 (% Cr-8% Ni) (Japan Industrial Standards, JIS G 4305) of austenitic stainless steel is widely used due to its excellent corrosion resistance and toughness.
  • this steel type is expensive because it contains a large amount of Ni.
  • SUS436L (18% Cr-1% Mo) (JIS G 4305) containing Mo as a steel type having excellent corrosion resistance equivalent to SUS304.
  • Mo is also an expensive element, even if it is contained only 1%, the cost is significantly increased (increase in cost).
  • SUS436L has sufficient toughness as a structural member.
  • Ferritic stainless steel not containing Mo has SUS430J1L (19% Cr-0.5% Cu-0.4% Nb) (JIS G 4305), but has sufficient toughness as a structural member. Is not good.
  • Patent Document 1 discloses that C: 0.020% or less, Si: 0.30 to 1.00%, Mn: 1.00% by mass.
  • P 0.040% or less
  • S 0.010% or less
  • Cr 20.0 to 28.0%
  • Ni 0.6% or less
  • Al 0.03 to 0.15%
  • N 0.020% or less
  • 0 0.0020 to 0.0150%
  • Mo 0.3 to 1.5%
  • Nb 0.25 to 0.60%
  • Ti 0.05% or less
  • a ferritic stainless steel sheet for water heaters is disclosed in which the balance is Fe and inevitable impurities, and satisfies 25 ⁇ Cr + 3.3Mo ⁇ 30 and 0.35 ⁇ Si + Al ⁇ 0.85.
  • Patent Document 2 in mass%, C: 0.1% or less, N: 0.003 to 0.05%, Si: 0.03 to 1.5%, Mn: 1.0% or less, P : 0.04% or less, S: 0.03% or less, Cr: 10 to 30%, Cu: 2% or less, Ni: 2% or less, Mo: 3% or less, V: 1% or less, Ti: 0.0.
  • a ferritic stainless steel sheet having excellent workability and toughness in which composite inclusions of inclusions containing 0.3 to 0.5 Al and Mg and Ti inclusions are dispersed.
  • Patent Document 1 improves the toughness of a hot-rolled steel sheet having a thickness of 4 mm at 0 ° C. for the purpose of ensuring productivity such as prevention of breakage of the steel strip during hot-rolled sheet annealing or cold rolling. It is a technology, and since it contains a large amount of Mo, an intermetallic compound that reduces toughness is easily generated. For this reason, it is thought that toughness is inadequate for application to a thicker use. Also in Patent Document 2, it is difficult to control dispersion of Ti-based inclusions, and the toughness of the hot-rolled steel sheet tends to decrease due to the coarsening, and sufficient toughness is not obtained. In addition, when considering the building material field assumed to be used in cold regions, it is considered necessary to have toughness with a Charpy impact value at ⁇ 50 ° C. of 100 J / cm 2 or more.
  • An object of the present invention is to provide a highly corrosion-resistant ferritic stainless steel hot-rolled steel sheet having excellent toughness with a Charpy impact value at ⁇ 50 ° C. of 100 J / cm 2 or more.
  • the solubility product exceeds 8.0 ⁇ 10 ⁇ 5 , it is considered that Ti nitride is precipitated and coarsened from the solidification stage of the molten steel, and the toughness is reduced due to the notch effect. .
  • the content of Cr is set to 18.0 to 24.0% from the viewpoint of corrosion resistance and manufacturability, and the amount of Al and the solubility product of Ti and N are controlled as described above to reduce toughness. It has been found that a high corrosion resistance ferritic stainless steel hot rolled steel sheet with excellent toughness can be obtained by suppressing the formation of coarse Al inclusions and Ti nitrides in the solidification stage of molten steel, which is a cause of the above.
  • the present invention has been made based on these findings.
  • the configuration of the present invention is as follows. (1) By mass%, C: 0.020% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.06% or less, S: 0.01% or less, Cr: 18 0.0 to 24.0%, Mo: 0.3% or less, Nb: 0.15 to 0.40%, Ti: 0.015% or less, N: 0.020% or less, Al: 0.20 to 0 Ferritic stainless steel hot rolled steel sheet containing .40% and satisfying the following formulas (A) and (B), the balance being Fe and inevitable impurities; Ti ⁇ N ⁇ 8.0 ⁇ 10 ⁇ 5 (A) 10 ⁇ (C + N) ⁇ Nb ⁇ 0.25 + (C / 12 + N / 14) ⁇ 93 (B)
  • each element symbol represents the component content (% by mass) in the steel.
  • a highly corrosion-resistant ferritic stainless steel hot-rolled steel sheet having excellent toughness with a Charpy impact value of ⁇ 50 ° C. being 100 J / cm 2 or more can be obtained.
  • C 0.020% or less C tends to form Cr carbide. When it exceeds 0.020%, Cr carbide is formed in a heat-affected zone during welding, and intergranular corrosion. Cause. Therefore, C is made 0.020% or less. Preferably it is 0.015% or less. In the case where higher corrosion resistance is required, it is more preferably 0.010% or less. In addition, when refining cost becomes a problem, it is preferable to set it as 0.003% or more.
  • Si 1.0% or less Si exceeds 1.0% and lowers toughness. Therefore, Si is 1.0% or less. Preferably it is 0.5% or less, More preferably, it is 0.3% or less. In addition, since Si is an element useful as a deoxidizing agent (deoxidizing agent), it is preferable to set it as 0.05% or more.
  • Mn 1.0% or less When Mn exceeds 1.0%, MnS, which is a soluble sulfide, is formed, and the corrosion resistance is lowered. Therefore, Mn is 1.0% or less. Preferably it is 0.8% or less, More preferably, it is 0.6% or less.
  • P 0.06% or less P exceeds 0.06%, it is not only harmful to corrosion resistance, but also reduces workability by solid solution strengthening. Therefore, P is set to 0.06% or less. Considering workability and toughness, it is preferably 0.04% or less.
  • S 0.01% or less If S exceeds 0.01%, it is harmful to corrosion resistance. Therefore, S is set to 0.01% or less. From the viewpoint of high corrosion resistance, it is preferably 0.006% or less.
  • Cr 18.0 to 24.0%
  • Cr is an element that improves the corrosion resistance by forming a passive film on the surface. If Cr is less than 18.0%, sufficient corrosion resistance cannot be obtained. On the other hand, if it exceeds 24.0%, sigma phase embrittlement and 475 ° C. brittleness tend to occur, and the toughness tends to decrease. Therefore, Cr is made 18.0 to 24.0%. From the viewpoint of high corrosion resistance, it is preferably 20.0 to 24.0%.
  • Mo 0.3% or less
  • Mo 0.3% or less
  • Nb 0.15 to 0.40%
  • Nb is contained in an amount of 0.15% or more, it has an effect of fixing C and N and suppressing sensitization.
  • Nb is set to 0.15 to 0.40%.
  • toughness it is preferably 0.15 to 0.35%, more preferably 0.15 to 0.30%.
  • Ti 0.015% or less Ti forms coarse nitrides and reduces toughness. Therefore, Ti is made 0.015% or less. Preferably it is 0.010% or less. When higher toughness is required, it is more preferably 0.005% or less.
  • N 0.020% or less
  • N 0.020% or less
  • a nitride is formed and the toughness is lowered.
  • coarse Ti nitride is generated from the solidification stage of the molten steel, and the toughness is significantly reduced due to the notch effect. Therefore, N is set to 0.020% or less. Preferably it is 0.015% or less. In the case where higher corrosion resistance is required, it is more preferably 0.010% or less.
  • Al 0.20 to 0.40%
  • Al is an important element in the present invention, and has an effect of improving toughness. With respect to the toughness targeted by the present invention, the effect is insufficient if it is less than 0.20%. Moreover, when it exceeds 0.40%, hot workability (hot-workability) falls. Therefore, Al is 0.20 to 0.40%. Preferably, it is 0.20 to 0.35%. When higher toughness is required, the content is more preferably 0.20 to 0.30%.
  • Ti ⁇ N ⁇ 8.0 ⁇ 10 ⁇ 5 As described above, coarse Ti nitride that causes a decrease in toughness of a ferritic stainless steel hot-rolled steel sheet is generated from the solidification stage of the molten steel. In order to suppress the formation of Ti nitride, it is necessary to limit the solubility product Ti ⁇ N to 8.0 ⁇ 10 ⁇ 5 or less. Preferably it is 5.0 * 10 ⁇ -5> or less.
  • Ti and N represent content (mass%) of each component.
  • Nb 10 ⁇ (C + N) ⁇ Nb ⁇ 0.25 + (C / 12 + N / 14) ⁇ 93 Nb fixes C and N, which are harmful to corrosion resistance, as Nb carbide, Nb nitride, and precipitates in which these are combined, renders them harmless, and has an effect of improving corrosion resistance.
  • the amount of Nb is less than 10 times the amount of (C + N)
  • the precipitation of Nb carbide, Nb nitride, and a precipitate in which these are combined becomes insufficient, and Cr carbide, Cr nitride, and the precipitate in which these are combined Precipitates and corrosion resistance decreases. Therefore, Nb is limited to 10 ⁇ (C + N)% or more.
  • Nb is 12 ⁇ (C + N)% or more.
  • the content of Nb exceeding [0.25+ (C / 12 + N / 14) ⁇ 93]% increases the solid solution Nb and decreases the toughness. Therefore, Nb is limited to [0.25+ (C / 12 + N / 14) ⁇ 93]% or less.
  • C, N, and Nb represent the content (mass%) of each component.
  • Inevitable impurities include Mg: 0.0020% or less, Ca: 0.0020% or less, and V: 0.10% or less, but are not limited thereto.
  • the Charpy impact value at ⁇ 50 ° C. is 150 J / cm 2 or more, and more excellent toughness is obtained, and more excellent corrosion resistance is obtained.
  • the ferritic stainless steel hot-rolled steel sheet of the present invention can achieve the desired characteristics with the above essential elements, but can contain the following elements according to desired characteristics.
  • Cu 0.3 to 0.8%
  • Cu is an element useful for improving the corrosion resistance, and is an element particularly effective in reducing crevice corrosion. In order to exhibit this effect, 0.3% or more is necessary. On the other hand, when it exceeds 0.8%, the hot workability deteriorates. Therefore, Cu is 0.3 to 0.8%. Preferably it is 0.3 to 0.5%.
  • Ni 1.0% or less Ni has an effect of reducing crevice corrosion. Moreover, when Cu is contained, there is also an effect of preventing a decrease in hot workability. In order to obtain such effects, Ni is preferably 0.05% or more. However, if it exceeds 1.0%, the cost is increased, and the effect is saturated. On the contrary, the hot workability is lowered. Therefore, Ni is 1.0% or less. Preferably it is 0.05 to 0.4%.
  • Co 1.0% or less
  • Co is an element contributing to improvement of toughness. In order to obtain such an effect, Co is preferably 0.05% or more. However, if it exceeds 1.0%, the ductility is lowered. Therefore, Co is set to 1.0% or less.
  • B 0.0002 to 0.0020%
  • B is an effective element for improving resistance to cold-work embrittlement during deep drawing. The effect cannot be obtained at less than 0.0002%. On the other hand, if it exceeds 0.0020%, hot workability and deep drawability are lowered. Therefore, B is set to 0.0002 to 0.0020%.
  • the method for efficiently producing the ferritic stainless steel hot rolled steel sheet according to the present invention includes continuous casting on a slab, heating to a range of 1100 to 1300 ° C., hot rolling, and hot rolling.
  • a coil When the coil winding temperature in hot rolling exceeds 650 ° C., carbides and intermetallic compounds are precipitated after winding and the toughness is lowered. Therefore, the coil winding temperature is preferably 650 ° C. or less, and higher toughness is required. Is more preferably 450 ° C. or lower.
  • the obtained hot-rolled steel sheet is annealed in the range of 900 to 1150 ° C.
  • This hot-rolled annealing plate can be used as a product as it is. Moreover, it can also be used as a raw material for cold rolling, and can be made into a product as a cold-rolled annealing plate by performing cold rolling-finish annealing.
  • Ferritic stainless steels having chemical components shown in Table 3-1 and Table 4-1 were melted, and 250 mm thick slabs were obtained by a continuous casting method. These slabs were heated to 1200 ° C., then roughly rolled to a thickness of 35 mm, finish rolling was started at 1050 ° C., finished at 900 ° C., wound into a coil at 500 ° C., cooled, and 5 mm in thickness and / or A 6 mm hot rolled steel sheet was used. The obtained hot-rolled steel sheet was held at 1050 ° C. or higher for 80 seconds (maximum temperature: 1100 ° C.), and then subjected to annealing for cooling to obtain a hot-rolled annealed sheet (hot-rolled steel sheet).
  • the pitting potential in a 3.5% NaCl solution at 30 ° C. is measured on a sample collected from a hot-rolled annealed plate, and it must be 180 mV vs SCE or higher. It is said to have excellent corrosion resistance.
  • ferritic stainless steel hot-rolled steel sheet provided by the present invention is excellent in corrosion resistance and toughness, it can be used for truck loading, grating, various flooring materials, and metal claps. ) Is promising as a material for structural members for civil engineering and construction (civil engineering and construction).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
PCT/JP2011/052187 2010-01-28 2011-01-27 靭性に優れた高耐食性フェライト系ステンレス熱延鋼板 WO2011093516A1 (ja)

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Application Number Priority Date Filing Date Title
CN201180007210.8A CN102725432B (zh) 2010-01-28 2011-01-27 韧性优异的高耐腐蚀性铁素体系不锈钢热轧钢板
KR1020127020446A KR101463526B1 (ko) 2010-01-28 2011-01-27 인성이 우수한 고내식성 페라이트계 스테인레스 열연 강판

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JP2010-016100 2010-01-28
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JP2010-021080 2010-02-02
JP2010021080 2010-02-02

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Cited By (1)

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CN114592155A (zh) * 2022-03-08 2022-06-07 福建青拓特钢技术研究有限公司 一种高表面质量430铁素体不锈钢ba板及其制造方法

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JP6071608B2 (ja) 2012-03-09 2017-02-01 新日鐵住金ステンレス株式会社 耐酸化性に優れたフェライト系ステンレス鋼板
JP5793459B2 (ja) * 2012-03-30 2015-10-14 新日鐵住金ステンレス株式会社 加工性に優れた耐熱フェライト系ステンレス冷延鋼板、冷延素材用フェライト系ステンレス熱延鋼板及びそれらの製造方法
MX2015013765A (es) 2013-03-27 2016-02-26 Nippon Steel & Sumikin Sst Hoja de acero inoxidalbe ferritico, laminada en caliente, proceso para la produccion de la misma y fleje de acero.
JP5918796B2 (ja) * 2014-03-28 2016-05-18 新日鐵住金ステンレス株式会社 靭性に優れたフェライト系ステンレス熱延鋼板および鋼帯
JP6005234B1 (ja) * 2015-09-29 2016-10-12 日新製鋼株式会社 疲労特性に優れた高強度ステンレス鋼板およびその製造方法
CN108495944B (zh) * 2016-02-02 2020-12-25 日铁不锈钢株式会社 含Nb铁素体系不锈钢热轧钢板及其制造方法、和含Nb铁素体系不锈钢冷轧钢板及其制造方法
KR101879696B1 (ko) * 2016-12-23 2018-07-19 주식회사 포스코 고온 강도 및 내산화 특성이 우수한 페라이트계 스테인리스강 및 이의 제조 방법
CN111020365A (zh) * 2018-10-09 2020-04-17 中国电力科学研究院有限公司 一种耐候钢及其钢板制作方法和角钢制作方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114592155A (zh) * 2022-03-08 2022-06-07 福建青拓特钢技术研究有限公司 一种高表面质量430铁素体不锈钢ba板及其制造方法
CN114592155B (zh) * 2022-03-08 2022-08-16 福建青拓特钢技术研究有限公司 一种高表面质量430铁素体不锈钢ba板及其制造方法

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CN102725432A (zh) 2012-10-10
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TWI499465B (zh) 2015-09-11
TW201143932A (en) 2011-12-16
JP4831256B2 (ja) 2011-12-07
KR101463526B1 (ko) 2014-11-19
CN102725432B (zh) 2015-04-15

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