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US20190055634A1 - Ferritic stainless steel sheet - Google Patents

Ferritic stainless steel sheet Download PDF

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US20190055634A1
US20190055634A1 US15/764,090 US201615764090A US2019055634A1 US 20190055634 A1 US20190055634 A1 US 20190055634A1 US 201615764090 A US201615764090 A US 201615764090A US 2019055634 A1 US2019055634 A1 US 2019055634A1
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steel sheet
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stainless steel
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Shuji Nishida
Tomohiro Ishii
Mitsuyuki Fujisawa
Chikara Kami
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JFE Steel Corp
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JFE Steel Corp
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    • C—CHEMISTRY; METALLURGY
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
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    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • 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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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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    • 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
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    • 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
    • C—CHEMISTRY; METALLURGY
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • C—CHEMISTRY; METALLURGY
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling

Definitions

  • the present invention relates to a ferritic stainless steel sheet having excellent corrosion resistance, only a small quantity of surface defects, and excellent toughness.
  • a ferritic stainless steel sheet which does not contain Ni in a large amount, is a material having a lower price and more excellent price stability than those of an austenitic stainless steel sheet.
  • ferritic stainless steel sheets are used in various applications such as building materials, transport machine, home electrical appliances, and kitchen appliances, since they are excellent in terms of rust resistance.
  • the kind of ferritic stainless steel sheet which is used particularly in a harsh corrosive environment is a SUS443J1-type stainless steel sheet (JIS G 4305), which has excellent corrosion resistance equivalent to that of a SUS304-type stainless steel sheet (JIS G 4305, 18-mass %-Cr-8-mass %-Ni-based), which is an austenitic stainless, steel, as a result of containing 20.0 mass % to 23.0 mass % of Cr, 0.3 mass % to 0.8 mass % of Cu, and sufficient amounts of stabilizing chemical elements (Ti, Nb, and Zr).
  • SUS443J1-type stainless steel which is commonly used is SUS443J1-type stainless steel containing mainly Ti as a stabilizing chemical element.
  • Such steel is excellent in terms of workability because texture growth is promoted as a result of containing Ti.
  • it is possible to manufacture such steel by using a cold-rolled-sheet annealing and pickling line which is used for common steel, which results in high productivity.
  • streaks surface defects
  • Patent Literature 1 and Patent Literature 2 describe the prevention of surface defects and the improvement of toughness regarding Ti-containing ferritic stainless steel.
  • Patent Literature 1 discloses a method for manufacturing Ti-containing ferritic stainless steel having excellent roping resistance and good surface quality.
  • the surface defect of a cold-rolled and annealed steel sheet is prevented by controlling the solidifying temperature of the steel, casting temperature, and TiN-precipitating temperature in the steel so that a specified relationship is satisfied in order to control the precipitation of TiN when the molten steel is cast.
  • Patent Literature 2 discloses a ferritic stainless steel sheet which has excellent toughness and good corrosion resistance and which is excellent in terms of productivity and economic efficiency and a method for manufacturing the steel sheet.
  • the toughness of a hot-rolled and annealed steel sheet and the toughness of a cold-rolled and annealed steel sheet are improved by allowing nitrides in the steel to exist in the form of ZrN.
  • An object of aspects of the present invention is to provide a ferritic stainless steel sheet excellent in corrosion resistance in which a decrease in the quantity of surface defects and an improvement in toughness are realized at the same time and which is sufficiently softened even in the case where cold-rolled-sheet annealing is performed at a temperature equivalent to that for conventional Ti-containing SUS443J1-type stainless steel.
  • the present inventors in response to the problems described above, conducted comprehensive investigations in order to realize a decrease in the quantity of surface defects and an improvement in toughness at the same time and, as a result, found that it is possible to improve the toughness of Ti-containing SUS443J1-type stainless steel by adding appropriate amounts of Zr and Nb in combination to Ti-containing SUS443J1-type stainless steel in order to change the precipitation form of TiN, which causes a deterioration in toughness, without an increase in cold-rolled-sheet annealing temperature. Moreover, it was found that, since it is possible to precipitate Ti-based inclusions in a finely dispersed form by this effect, it is possible to decrease the quantity of surface defects of a steel sheet caused by TiN.
  • the stabilizing chemical elements Ti, Nb, and Zr
  • the content of Ti which is the main stabilizing chemical element
  • the Nb content which is equal to or less than the Ti content
  • the Zr content which is equal to or less than the Nb content
  • the mechanism of these is supposed to be as follows.
  • a ferritic stainless steel sheet having a chemical composition containing, by mass %, C: 0.020% or less, Si: 0.05% to 0.40%, Mn: 0.05% to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001% to 0.15%, Cr: 20.0% to 23.0%, Ni: 0.01% to 0.80%, Cu: 0.30% to 0.80%, Ti: 0.10% to 0.50%, Nb: 0.010% to 0.150%, Zr: 0.005% to 0.150%, N: 0.020% or less, and the balance being Fe and inevitable impurities, in which relational expression (1) below is satisfied.
  • each of Zr, Nb, and Ti in relational expression (1) denotes the content (mass %) of the corresponding chemical element.
  • FIG. 1 is a diagram illustrating the influence of the contents of Ti and Nb on toughness and the quantity of surface defects under the condition of Zr ⁇ Nb.
  • FIG. 2 is a diagram illustrating the influence of the contents of Nb and Zr on toughness and the quantity of surface defects under the condition of Nb Ti.
  • the chemical composition of the ferritic stainless steel sheet according to aspects of the present invention has a chemical composition containing, by mass %, C: 0.020% or less, Si: 0.05% to 0.40%, Mn: 0.05% to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001% to 0.15%, Cr: 20.0% to 23.0%, Ni: 0.01% to 0.80%, Cu: 0.30% to 0.80%, Ti: 0.10% to 0.50%, Nb: 0.010% to 0.150%, Zr: 0.005% to 0.150%, N: 0.020% or less, and the balance being Fe and inevitable impurities, in which relational expression (1) below is satisfied.
  • each of Zr, Nb, and Ti in relational expression (1) denotes the content (mass %) of the corresponding chemical element.
  • the chemical composition described above may further contain, by mass %, one, two, or all selected from Co: 0.01% to 0.50%, Mo: 0.01% to 0.30%, and W: 0.01% to 0.50%.
  • the chemical composition described above may further contain, by mass %, one, two, or more selected from V: 0.01% to 0.50%, B: 0.0003% to 0.0030%, Mg: 0.0005% to 0.0100%, Ca: 0.0003% to 0.0030%, Y: 0.001% to 0.20%, and REM (rare-earth metal): 0.001% to 0.10%.
  • the chemical composition described above may further contain, by mass %, one or both selected from Sn: 0.001% to 0.50% and Sb: 0.001% to 0.50%.
  • the C is a chemical element which is effective for improving the strength of steel. Such an effect is obtained in the case where the C content is 0.001% or more. However, in the case where the C content is more than 0.020%, there is a significant deterioration in corrosion resistance and workability. Therefore, the C content is set to be 0.020% or less, preferably 0.015% or less, or more preferably 0.010% or less.
  • Si is a chemical element which is effective as a deoxidizing agent. Such an effect is obtained in the case where, the Si content is 0.05% or more.
  • the Si content is more than 0.40%, there is a deterioration in workability due to an increase in the hardness of steel.
  • the Si content is more than 0.40%, since there is a decrease in the amount of scale formed on the upper surface of a slab, which has a lubrication effect when hot rolling is performed, there is an increase in the quantity of surface defects. Therefore, the Si content is limited to be in the range of 0.05% to 0.40%, or preferably 0.05% to 0.25%. It is more preferable that the lower limit of the Si content be 0.08% or more. It is more preferable that the upper limit of the Si content be 0.15% or less.
  • Mn has a deoxidizing function. Such an effect of Mn is obtained in the case where the Mn content is 0.05% or more.
  • the Mn content is more than 1.00%, since the precipitation and coarsening of MnS are promoted, there is a deterioration in corrosion resistance. Therefore, the Mn content is limited to be in the range of 0.05% to 1.00%. It is preferable that the lower limit of the Mn content be 0.10% or more, or more preferably 0.15% or more. It is preferable that the upper limit of the Mn content be less than 0.30%, or more preferably 0.25% or less.
  • P is a chemical element which deteriorates corrosion resistance.
  • the P content is set to be 0.040% or less, or preferably 0.030% or less.
  • the S content be smaller, and the S content is set to be 0.030% or less, or preferably 0.020% or less.
  • Al is a chemical element which is effective for deoxidation. Such an effect is obtained in the case where the Al content is 0.001% or more.
  • the Al content is more than 0.15%, since there is a decrease in the amount of scale formed on the surface of a slab, which has a lubrication effect when hot rolling is performed, there is an increase in the quantity of surface defects. Therefore, the Al content is limited to be in the range of 0.001% to 0.15%. It is preferable that the lower limit of the Al content be 0.005% or more, or more preferably 0.01% or more. It is preferable that the upper limit of the Al content be 0.10% or less, or more preferably 0.05% or less.
  • the Cr is a chemical element which improves corrosion resistance by forming a passive film on the surface. It is not possible to achieve sufficient corrosion resistance in the case where the Cr content is less than 20.0%. On the other hand, in the case where the Cr content is more than 23.0%, there is a tendency for toughness to deteriorate due to a phase and 475° C. embrittlement. Therefore, the Cr content is set to be 20.0% to 23.0%. It is preferable the lower limit of the Cr content be 20.5% or more. It is preferable that the upper limit of the Cr content be 22.0% or less, or more preferably 21.5% or less.
  • Ni is a chemical element which makes it possible to maintain a passive state even at a lower pH by inhibiting an anode reaction due to acid. That is, Ni improves corrosion resistance by markedly inhibiting the progress of corrosion in an active dissolution state as a result of increasing the effect of crevice corrosion resistance. Such an effect of Ni is obtained in the case where the Ni content is 0.01% or more. On the other hand, in the case where the Ni content is more than 0.80%, there is a deterioration in workability due to an increase in the hardness of steel. Therefore, the Ni content is limited to be 0.01% to 0.80%. It is preferable that the lower limit of the Ni content be 0.05% or more, or more preferably 0.10% or more. It is preferable that the upper limit of the Ni content be 0.40% or less, or more preferably 0.25% or less.
  • the Cu is a chemical element which improves corrosion resistance by strengthening a passive film.
  • the Cu content is set to be 0.30% to 0.80%. It is preferable that the lower limit of the Cu content be 0.35% or more, or more preferably 0.40% or more. It is preferable that the upper limit of the Cu content be 0.60% or less, or more preferably 0.45% or less.
  • Ti is a chemical element which improves corrosion resistance by preventing sensitization due to Cr carbonitrides as a result of fixing C and N.
  • TiN which is formed as a result of containing Ti, causes a deterioration in toughness.
  • the above-mentioned deterioration in toughness due to Ti is suppressed by the combination effect of Nb and Zr as described below.
  • the effect of improving corrosion resistance through the use of Ti is obtained in the case where the Ti content is 0.10% or more.
  • the Ti content is more than 0.50%, there is a deterioration in workability due to an increase in the hardness of a stainless steel sheet.
  • the Ti content is set to be in the range of 0.10% to 0.50%. It is preferable that the lower limit of the Ti content be 0.15% or more, or more preferably 0.18% or more. It is preferable that the upper limit of the Ti content be 0.35% or less, or more preferably 0.26% or less.
  • Nb 0.010% to 0.150%
  • Nb is, like Ti, a chemical element which improves corrosion resistance by preventing sensitization due to Cr carbonitrides as a result of fixing C and N. Moreover, Nb improves toughness and inhibits a surface defect from occurring by the combination effect with Zr described below. Such effects are obtained in the case where the Nb content is 0.010% or more. On the other hand, in the case where the Nb content is more than 0.150%, there is a deterioration in workability due to an increase in the hardness of a stainless steel sheet. In addition, in the case where the Nb content is more than 0.150%, since there is an increase in recrystallization temperature, there is a deterioration in manufacturability.
  • the Nb content is set to be in the range of 0.010% to 0.150%. It is preferable that the lower limit of the Nb content be 0.030% or more, or more preferably 0.070% or more. It is preferable that the upper limit of the Nb content be less than 0.100%, or more preferably 0.090% or less.
  • Zr is, like Ti, a chemical element which improves corrosion resistance by preventing sensitization due to Cr carbonitrides as a result of fixing C and N. Moreover, Zr improves toughness and inhibits a surface defect from occurring by the combination effect with Nb described below. It is necessary that the Zr content be 0.005% or more in order to obtained such effects. On the other hand, in the case where the Zr content is more than 0.150%, since Zr-based inclusions are precipitated on the surface, there is an increase in the quantity of surface defects. Therefore, the Zr content is limited to be in the range of 0.005% to 0.150%. It is preferable that the lower limit of the Zr content be 0.010% or more, or more preferably 0.030% or more. It is preferable that the upper limit of the Zr content be less than 0.100%, or more preferably 0.080% or less.
  • the stabilizing chemical elements Ti, Nb, and Zr
  • the chemical composition of a SUS443J1-type stainless steel so that the Ti content is 0.10% to 0.50%, the Nb content is 0.010% to 0.150%, and the Zr content is 0.005% to 0.150% under the condition expressed by relational expression (1) below, it is possible to allow sufficient softening to occur by performing cold-roiled-sheet annealing even at a temperature equivalent to that for the case where a stabilizing chemical element is limited to Ti, and it is possible to realize a decrease in the quantity of surface defects and a high toughness at the same time.
  • the mechanism of these is supposed to be as follows.
  • each of Zr, Nb, and Ti in relational expression (1) denotes the content (mass %) of the corresponding chemical element.
  • Ti and Nb it is preferable that the relational expression Ti ⁇ 1.5Nb, or more preferably Ti ⁇ 2Nb, be satisfied.
  • Nb and Zr it is preferable that the relational expression Nb ⁇ 1.3Zr, or more preferably Nb ⁇ 1.5Zr, be satisfied.
  • N is a chemical element which is inevitably mixed in steel.
  • the N content is set to be 0.020% or less, or preferably 0.015% or less.
  • Co is a chemical element which improves the crevice corrosion resistance of stainless steel. Such an effect of Co is obtained in the case where the Co content is 0.01% or more. However, in the case where the Co content is more than 0.50%, such an effect of Co becomes saturated, and there is a deterioration in workability. Therefore, in the case where Co is contained, the Co content is set to be 0.01% to 0.50%. It is preferable that the lower limit of the Co content be 0.02% or more, or more preferably 0.03% or more. It is preferable that the upper limit of the Co content be 0.30% or less, or more preferably 0.10% or less.
  • Mo is effective for improving the crevice corrosion resistance of stainless steel. Such an effect is obtained in the case where the Mo content is 0.01% or more. However, in the case where the Mo content is more than 0.30%, such an effect of Mo becomes saturated, and there is a deterioration in toughness due to the formation of coarse intermetallic compounds. Therefore, in the case where Mo is added, the Mo content is set to be 0.01% to 0.30%. It is preferable that the lower limit of the Mo content be 0.02% or more, or more preferably 0.03% or more. It is preferable that the upper limit of the Mo content be 0.20% or less, or more preferably 0.10% or less.
  • W is a chemical element which improves the crevice corrosion resistance of stainless steel. Such an effect of W is obtained in the case where the W content is 0.01% or more. On the other hand, in the case where the W content is more than 0.50%, such an effect of W becomes saturated, and there is a deterioration in workability. Therefore, in the case where W is contained, the W content is set to be 0.01% to 0.50%. It is preferable that the lower limit of the W content be 0.02% or more, or more preferably 0.03% or more. It is preferable that the upper limit of the W content be 0.30% or less, or more preferably 0.10% or less.
  • V 0.01% to 0.50%
  • V is a chemical element which improves the crevice corrosion resistance of stainless steel. Such an effect of V is obtained in the case where the V content is 0.01% or more. On the other hand, in the case where the V content is more than 0.50%, such an effect of V becomes saturated, and there is a deterioration in workability. Therefore, in the case where V is added, the V content is set to be 0.01% to 0.50%, preferably 0.01% to 0.30%, or more preferably 0.01% to 0.10%.
  • B is a chemical element which improves hot workability and secondary workability, it is effective to containing B to Ti-containing steel. Such an effect of B is obtained in the case where the B content is 0.0003% or more. On the other hand, in the case where the B content is more than 0.0030%, there is a deterioration in toughness. Therefore, in the case where B is contained, the B content is set to be in the range of 0.0003% to 0.0030%. It is preferable that the lower limit of the B content be 0.0015% or more. It is preferable that the upper limit of the B content be 0.0025% or less.
  • Mg functions as a deoxidizing agent along with Al by forming Mg oxides in molten steel. Such an effect of Mg is obtained in the case where the Mg content is 0.0005% or more.
  • the Mg content is more than 0.0100%, there is a deterioration in manufacturability and a deterioration in the toughness of steel. Therefore, in the case where Mg is contained, the Mg content is limited to be in the range of 0.0005% to 0.0100%. It is preferable that the lower limit of the Mg content be 0.0010% or more. It is preferable that the upper limit of the Mg content be 0.0050% or less, or more preferably 0.0030% or less.
  • Ca is a chemical element which improves hot workability. Such an effect of Ca is obtained in the case where the Ca content is 0.0003% or more. On the other hand, in the case where the Ca content is more than 0.0030%, there is a deterioration in the toughness of steel, and there is a deterioration in corrosion resistance due to the precipitation of CaS. Therefore, in the case where Ca is added, the Ca content is limited to be in the range of 0.0003% to 0.0030%. It is preferable that the lower limit of the Ca content be 0.001% or more. It is preferable that the upper limit of the Ca content be 0.002% or less.
  • Y is a chemical element which improves cleanliness by inhibiting a decrease in the viscosity of molten steel. Such an effect of Y is obtained in the case where the Y content is 0.001% or more. On the other hand, in the case where the Y content is more than 0.20%, such an effect of Y becomes saturated, and there is a deterioration in workability. Therefore, in the case where Y is added, the Y content is limited to be in the range of 0.001% to 0.20%, or preferably 0.001% to 0.10%.
  • REM rare-earth metal: one of the chemical elements having atomic numbers of 57 through 71 such as La, Ce, or Nd
  • REM content is a chemical element which improves high-temperature oxidation resistance.
  • the REM content is 0.001% or more.
  • the REM content is more than 0.10%, such an effect of REM becomes saturated, and a surface defect occurs when hot rolling is performed. Therefore, in the case where REM is contained, the REM content is limited to be in the range of 0.001% to 0.10%. It is preferable the lower limit of the REM content be 0.005% or more. It is preferable that the upper limit of the REM content be 0.05% or less.
  • Sn is effective for improving ridging resistance by promoting the formation of a deformation zone when rolling is performed. Such an effect is obtained in the case where the Sn content is 0.001% or more. However, in the case where the Sn content is more than 0.50%, such an effect of Sn becomes saturated, and there is a deterioration in workability. Therefore, in the case where Sn is added, the Sn content is set to be 0.001% to 0.50%. It is preferable that the lower limit of the Sn content be 0.003% or more. It is preferable that the upper limit of the Sn content be 0.20% or less.
  • Sb is effective for improving ridging resistance by promoting the formation of a deformation zone when rolling is performed. Such an effect is obtained in the case where the Sb content is 0.001% or more. However, in the case where the Sb content is more than 0.50%, such an effect of Sb becomes saturated, and there is a deterioration in workability. Therefore, in the case where Sb is contained, the Sb content is set to be 0.001% to 0.50%. It is preferable that the lower limit of the Sb content be 0.003% or more. It is preferable that the upper limit of the Sb content be 0.20% or less.
  • the remainder which is other than the constituent chemical elements described above is Fe and inevitable impurities.
  • Representative examples of the inevitable impurities described here include H, O (oxygen), Zn, Ga, Ge, As, Ag, In, Hf, Ta, Re, Os, Ir, Pt, Au, and Pb.
  • H and O (oxygen) may be contained in an amount of 0.05% or less.
  • Other chemical elements may be contained in an amount of 0.3% or less.
  • Molten steel having the chemical composition described above is prepared by using a known method such as one which utilizes a converter, an electric furnace, or a vacuum melting furnace and made into a steel material (slab) by using a continuous casting method or an ingot casting-slabbing method.
  • This steel material is heated to a temperature of 1000° C. to 1200° C. and then subjected to hot rolling so as to have a thickness of 2.0 mm to 5.0 mm under the condition of a finishing temperature of 700° C. to 1000° C.
  • the hot-rolled steel sheet, which has been obtained as described above, is subjected to annealing at a temperature of 800° C.
  • the cold-rolled steel sheet from which scale has been removed may be subjected to skin pass rolling.
  • aspects of the present invention are effective not only for the above-mentioned cold-rolled sheet product but also for a hot-rolled sheet product.
  • Table 1-1 and Table 1-2 are combined to form Table 1
  • Table 2 Table 2-1 and Table 2-2 are combined to form Table 2
  • Table 3 Table 3-1 and Table 3-2 are combined to form Table 3
  • the hot-rolled steel sheets were subjected to annealing at a temperature of 1100° C. followed by pickling which utilized a commonly used method and subjected to cold rolling so as to have a thickness of 2.0 mm followed by annealing at a temperature of 900° C. and pickling which utilized a commonly used method.
  • the quantity of surface defects was evaluated.
  • 10 steel sheets having each of the chemical compositions and by counting the number of streaks having a length in the L-direction of more than 10 mm in a region having a width of 200 mm and a length of 200 mm on the center portion of the upper surface of each of the steel sheets, a case where the average of the counted numbers was 1 or less was judged as “ ⁇ ” (satisfactory), and a case where the average of the counted numbers was more than 1 was judged as “ ⁇ ” (unsatisfactory).
  • test pieces having a length of 15 mm and a width of 20 mm were taken from the cold-rolled steel sheet, and each of the test pieces for respectively determining b and c was subjected to the corresponding annealing. Subsequently, each of the three test pieces were cut into pieces having a length of 15 mm and a width of 10 mm. Then, the Vickers hardness determined in the cross section of the cut piece was used for the evaluation. As annealing progressed, the harness of the steel sheet changed from a to c. A case where 90% or more of such a softening process was completed through annealing at a temperature of 880° C. for 20 seconds, that is, a case where the relational expression c+0.1 ⁇ (a ⁇ c) ⁇ b was satisfied, was judged as “ ⁇ ” (satisfactory), and other cases were judged as “ ⁇ ” (unsatisfactory).
  • Comparative example No. 34 whose Cr content was lower than the range according to aspects of the present invention, had poor corrosion resistance.
  • Comparative example No. 35 whose Cr content was higher than the range according to aspects of the present invention, had poor toughness.
  • Comparative example No. 36 whose Ni content was lower than the range according to aspects of the present invention, had poor corrosion resistance.
  • Comparative example No. 37 whose Ti content was lower than the range according to aspects of the present invention, had poor corrosion resistance.
  • Comparative example No. 38 whose Ti content was higher than the range according to aspects of the present invention, had poor toughness and a large quantity of surface defects.
  • Comparative example No. 39 whose Nb content was lower than the range according to aspects of the present invention, had poor toughness and a large quantity of surface defects.
  • Comparative example No. 40 whose Nb content was higher than the range according to aspects of the present invention, had poor manufacturability due to a high softening temperature.
  • Comparative example No. 41 whose Zr content was lower than the range according to aspects of the present invention, had poor toughness and a large quantity of surface defects.
  • Comparative example No. 42 whose Zr content was higher than the range according to aspects of the present invention, had a large quantity of surface defects.
  • Comparative example No. 57 whose contents of Nb and Zr were both lower than the range according to aspects of the present invention, had poor toughness and a large quantity of surface defects.
  • Comparative example No. 58 whose contents of Ti and Zr were both lower than the ranges according to aspects of the present invention, and whose contents of Al and Nb were both higher than the ranges according to aspects of the present invention, had poor toughness, a large quantity of surface defects, and poor manufacturability due to a high softening temperature.
  • FIG. 1 illustrates the evaluation results of Charpy impact values and surface defects of the examples of the present invention and comparative examples (Nos. 43 through 48), whose chemical compositions were within the range according to aspects of the present invention, and in which the relational expression Nb Zr was satisfied and the relational expression Ti Nb was not satisfied, in a form of graph in which the horizontal axis indicates the Ti content and the vertical axis indicates the Nb content.
  • the evaluation result regarding a Charpy impact value was satisfactory
  • the evaluation regarding a surface defect was satisfactory
  • the evaluation regarding a Charpy impact value was unsatisfactory
  • the evaluation regarding a surface defect was unsatisfactory.
  • FIG. 1 indicates, it is necessary that the relational expression Ti ⁇ Nb be satisfied in order to realize excellent toughness and a decrease in the quantity of surface defects at the same time within the range of the chemical composition according to aspects of the present invention.
  • FIG. 2 illustrates the evaluation results of Charpy impact values and surface defects of the examples of the present invention and comparative examples (Nos. 49 through 54, 67, and 68), whose chemical compositions were within the range according to aspects of the present invention, and in which the relational expression Ti Nb was satisfied and the relational expression Nb Zr was not satisfied, in a form of graph in which the horizontal axis indicates the Nb content and the vertical axis indicates the Zr content.
  • FIG. 2 indicates, it is necessary that the relational expression Nb ⁇ Zr be satisfied in order to realize excellent toughness and a decrease in the quantity of surface defects at the same time within the range of the chemical composition according to aspects of the present invention.
  • comparative example Nos. 55 and 56 whose chemical compositions were within the range according to aspects of the present invention, and in which the relational expression Ti ⁇ Nb. or the relational expression Nb ⁇ Zr was not satisfied, were unsatisfactory in the evaluations both regarding a Charpy impact value and regarding a surface defect.
  • the ferritic stainless steel sheet according to aspects of the present invention which has excellent toughness and only a small quantity of surface defects, can preferably be used not only for parts which are required to have satisfactory corrosion resistance but also for parts which are required to have satisfactory toughness and surface quality including the inner panels of elevators, interiors, duct hoods, muffler cutters, lockers, the parts of home electrical appliances, the parts of office appliances, the interior parts of automobiles, the exhaust pipes of automobiles, building materials, the lids of drainage channel, maritime containers, house wares, kitchen appliances, the interior and exterior materials of buildings, automobile parts, escalators, railway vehicles, the chassis of electrical apparatuses and the like.

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CN111032898B (zh) * 2017-09-29 2021-08-20 杰富意钢铁株式会社 铁素体系不锈钢热轧退火钢板及其制造方法
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CN113234994A (zh) * 2021-04-14 2021-08-10 马鞍山钢铁股份有限公司 一种屈服强度600MPa级热轧高强耐候钢板及其生产方法
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