WO2022145068A1 - Matériau d'acier - Google Patents

Matériau d'acier Download PDF

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WO2022145068A1
WO2022145068A1 PCT/JP2021/014781 JP2021014781W WO2022145068A1 WO 2022145068 A1 WO2022145068 A1 WO 2022145068A1 JP 2021014781 W JP2021014781 W JP 2021014781W WO 2022145068 A1 WO2022145068 A1 WO 2022145068A1
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steel
steel material
recrystallization
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PCT/JP2021/014781
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English (en)
Japanese (ja)
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恭平 石川
謙 木村
靖之 荻巣
美百合 梅原
真吾 山▲崎▼
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日本製鉄株式会社
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • 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
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • the present invention relates to steel materials.
  • Patent Document 1 by further coexisting B in addition to Nb, the recrystallization temperature of austenite is increased by 50 ° C. or more and the hardenability is significantly improved, and the values expected from the Nb and B single system are obtained. It is taught that the improvement of the strength / toughness balance is extremely large in comparison.
  • Patent Documents 2 and 3 describe that Nb is an element effective for refining austenite grains at a high temperature because it raises the recrystallization temperature.
  • Patent Document 4 describes that a small amount of Nb suppresses the recrystallization of austenite and contributes to the miniaturization of the metal structure.
  • Niobium (Nb) is known to be an element effective in suppressing recrystallization, but it is also an element that contributes to improvement of hardenability and strengthening of precipitation. Therefore, if the content of Nb is increased in order to obtain a higher recrystallization suppressing effect, the strength of the obtained steel material may become too high, or the toughness may decrease in connection therewith. Therefore, in the present technical field, for steel materials containing elements other than Nb, which have the same or higher recrystallization suppressing effect as Nb, depending on the application in which the steel material is used and the characteristics required in the application. There is a need.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a steel material having an improved recrystallization suppressing effect or an improved recrystallization suppressing effect due to a novel configuration. To provide.
  • the present inventors have investigated an element capable of suppressing or delaying the recrystallization of austenite crystal grains.
  • the present inventors suppress or delay recrystallization by increasing the amount of the specific element dissolved in the steel, and the temperature at which recrystallization starts (hereinafter, simply "recrystallization start temperature”).
  • recrystallization start temperature the temperature at which recrystallization starts
  • the steel materials that have achieved the above objectives are as follows. (1) By mass%, C: 0.001 to 1.000%, Si: 0.01-3.00%, Mn: 0.10 to 4.50%, P: 0.300% or less, S: 0.0300% or less, Al: 0.001-5.000%, N: 0.2000% or less, O: 0.0100% or less, At least one R element selected from the group consisting of La: 0 to 0.8000%, Ce: 0 to 0.8000%, Nd: 0 to 0.8000%, and Y: 0 to 0.8000%.
  • Nb 0-3.000%, Ti: 0 to 0.500%, Ta: 0 to 0.500%, V: 0 to 1.00%, Cu: 0 to 3.00%, Ni: 0-60.00%, Cr: 0 to 30.00%, Mo: 0 to 5.00%, W: 0 to 2.00%, B: 0-0.0200%, Co: 0 to 3.00%, Be: 0 to 0.050%, Ag: 0 to 0.500%, Zr: 0 to 0.5000%, Hf: 0 to 0.5000%, Ca: 0-0.0500%, Mg: 0-0.0500%, At least one of Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pm, and Sc: 0-0.5000% in total, Sn: 0 to 0.300%, Sb: 0 to 0.300%, Te: 0 to 0.100%, Se: 0 to 0.100%, As: 0 to 0.050%, Bi: 0 to 0.500%, Pb:
  • [La], [Ce], [Nd], [Y], [O], [S], and [P] are the content [mass%] of each element, and the element is not contained.
  • the chemical composition is mass%.
  • Nb 0.003 to 3.000%, Ti: 0.005 to 0.500%, Ta: 0.001 to 0.500%, V: 0.001 to 1.00%, Cu: 0.001 to 3.00%, Ni: 0.001 to 60.00%, Cr: 0.001 to 30.00%, Mo: 0.001 to 5.00%, W: 0.001 to 2.00%, B: 0.0001-0.0200%, Co: 0.001 to 3.00%, Be: 0.0003 to 0.050%, Ag: 0.001 to 0.500%, Zr: 0.0001 to 0.5000%, Hf: 0.0001 to 0.5000%, Ca: 0.0001-0.0500%, Mg: 0.0001-0.0500%, At least one of Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pm, and Sc: 0.0001 to 0.5000% in total, Sn: 0.001 to 0.300%, Sb: 0.001 to 0.300%, Te: 0.001 to 0.100%, Se:
  • the steel material according to the embodiment of the present invention is based on mass%.
  • Nb 0-3.000%, Ti: 0 to 0.500%, Ta: 0 to 0.500%, V: 0 to 1.00%, Cu: 0 to 3.00%, Ni: 0-60.00%, Cr: 0 to 30.00%, Mo: 0 to 5.00%, W: 0 to 2.00%, B: 0-0.0200%, Co: 0 to 3.00%, Be: 0 to 0.050%, Ag: 0 to 0.500%, Zr: 0 to 0.5000%, Hf: 0 to 0.5000%, Ca: 0-0.0500%, Mg: 0-0.0500%, At least one of Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pm, and Sc: 0-0.5000% in total, Sn: 0 to 0.300%, Sb: 0 to 0.300%, Te: 0 to 0.100%, Se: 0 to 0.100%, As: 0 to 0.050%, Bi: 0 to 0.500%, Pb:
  • the rolling temperature is high at this time, the Fe atoms move by themselves so as to eliminate the deformation zone and the ledge, and try to return from the disturbed unstable state to a stable crystal in which the Fe atoms are neatly arranged. This is a phenomenon called recrystallization.
  • the rolling temperature is low (for example, when it is less than about 800 ° C.), Fe atoms cannot move, so that hot rolling is performed while leaving ledges and deformation bands at grain boundaries and many places in the grain. Will end.
  • the metallographic structure transforms from austenite to ferrite, and such transformation generally occurs from a place where the arrangement of Fe atoms in austenite is disturbed. Therefore, when austenite is recrystallized during hot rolling, the arrangement of Fe atoms is disturbed only at the grain boundaries, so that new ferrite crystals can only be generated from the austenite grain boundaries. ..
  • hot rolling is performed at a low temperature of less than about 800 ° C., it becomes possible to generate a large number of new ferrite crystals from ledges and deformation bands existing in many places of austenite.
  • the present inventors have investigated an element that can suppress or delay the recrystallization of austenite crystal grains.
  • the present inventors have determined the amount of specific elements that are solidly dissolved in the steel, that is, the elements La, Ce, Nd, and Y (hereinafter, also referred to as "R element") in the steel.
  • R element the elements La, Ce, Nd, and Y
  • the recrystallization of austenite crystal grains can be suppressed or delayed, and the recrystallization start temperature due to such suppression or delay of recrystallization.
  • the recrystallization start temperature due to such suppression or delay of recrystallization.
  • the above R element according to the embodiment of the present invention adheres to lattice defects such as dislocations introduced into steel during hot rolling.
  • recrystallization is suppressed by inhibiting the rearrangement of the dislocations to move to a stable arrangement.
  • all of the above R elements have a larger atomic radius than Nb used in the prior art, dislocations are caused by fixing elements having such a relatively large atomic radius to lattice defects such as dislocations. It is considered that the inhibitory effect such as rearrangement of the above is enhanced, and as a result, at least the same or higher recrystallizing inhibitory effect can be achieved as compared with the conventional steel material using Nb. Therefore, in the present invention, it is extremely important to dissolve a large amount of such an element having a relatively large atomic radius in the steel.
  • R elements are likely to combine with O (oxygen), S (sulfur), and P (phosphorus) present in steel to form inclusions consisting of oxides, sulfides, and phosphors.
  • O oxygen
  • S sulfur
  • P phosphorus
  • the R element forms such inclusions in the steel, the amount of solid solution of the R element that can contribute to the suppression of recrystallization decreases, and the R element adheres to lattice defects such as dislocations. As a result, the recrystallization inhibitory effect obtained by this cannot be sufficiently obtained.
  • the solid solution amount of the R element in consideration of such inclusions is calculated as the effective amount of the R element by the above formula 1 which will be described in detail later, and the effective amount is within a predetermined range, that is, By setting it to 0.0003% or more, it is possible to achieve a higher recrystallization suppressing effect.
  • the R element in the present invention tends to combine with O, S and P to form inclusions, and therefore it is generally difficult to secure a predetermined solid solution amount in steel. Due to such circumstances, the effect of suppressing recrystallization by the above R element has not been known so far. However, recent advances in refining technology have made it possible to reduce the content of elements such as O, S, and P, which are generally present in steel as impurities, to extremely low levels. It was possible to realize solid solution within a predetermined range of the above R element. Therefore, the recrystallization inhibitory effect caused by the solid solution of the R element has been clarified for the first time by the present inventors, and is extremely surprising and surprising.
  • Carbon (C) is an element necessary for stabilizing hardness and / or ensuring strength. In order to sufficiently obtain these effects, the C content is 0.001% or more. The C content may be 0.005% or more, 0.010% or more, or 0.020% or more. On the other hand, if C is excessively contained, toughness, bendability and / or weldability may decrease. Therefore, the C content is 1.000% or less. The C content may be 0.800% or less, 0.600% or less, or 0.500% or less.
  • Si is a deoxidizing element and is an element that also contributes to the improvement of strength. In order to sufficiently obtain these effects, the Si content is 0.01% or more. The Si content may be 0.05% or more, 0.10% or more, or 0.30% or more. On the other hand, if Si is excessively contained, the toughness may be lowered or surface quality defects called scale defects may occur. Therefore, the Si content is 3.00% or less. The Si content may be 2.00% or less, 1.00% or less, or 0.60% or less.
  • Manganese (Mn) is an element effective for improving hardenability and / or strength, and is also an effective austenite stabilizing element. In order to sufficiently obtain these effects, the Mn content is 0.10% or more. The Mn content may be 0.50% or more, 0.70% or more, or 1.00% or more. On the other hand, if Mn is excessively contained, MnS harmful to toughness may be generated or the oxidation resistance may be lowered. Therefore, the Mn content is 4.50% or less. The Mn content may be 4.00% or less, 3.50% or less, or 3.00% or less.
  • Phosphorus (P) is an element mixed in the manufacturing process, and is preferable from the viewpoint of reducing inclusions formed with the R element according to the embodiment of the present invention, and the P content is 0%. You may. However, in order to reduce the P content to less than 0.0001%, it takes time for refining, which leads to a decrease in productivity. Therefore, the P content may be 0.0001% or more, 0.0005% or more, 0.001% or more, 0.003% or more, or 0.005% or more. The P content may be 0.007% or more from the viewpoint of manufacturing cost.
  • the P content is 0.300% or less.
  • the P content may be 0.100% or less, 0.030% or less, or 0.010% or less.
  • S 0.0300% or less
  • Sulfur (S) is an element mixed in the manufacturing process, and is preferable from the viewpoint of reducing inclusions formed with the R element according to the embodiment of the present invention, so that the S content is 0%. There may be. However, in order to reduce the S content to less than 0.0001%, it takes time for refining, which leads to a decrease in productivity. Therefore, the S content may be 0.0001% or more, 0.0005% or more, or 0.0010% or more. On the other hand, if S is excessively contained, the effective amount of the R element may decrease and the toughness may decrease. Therefore, the S content is 0.0300% or less.
  • the S content is preferably 0.0100% or less, more preferably 0.0050% or less, and most preferably 0.0030% or less.
  • Aluminum (Al) is a deoxidizing element and is also an effective element for improving corrosion resistance and / or heat resistance.
  • the Al content is 0.001% or more.
  • the Al content may be 0.010% or more, 0.100% or more, or 0.200% or more.
  • the Al content may be 1.000% or more, 2.000% or more, or 3.000% or more.
  • the Al content is 5.000% or less.
  • the Al content may be 4.500% or less, 4000% or less, or 3.500% or less.
  • the Al content may be 1.500% or less, 1.000% or less, or 0.300% or less.
  • N Nitrogen (N) is an element mixed in the manufacturing process.
  • the N content may be 0%. However, in order to reduce the N content to less than 0.0001%, it takes time for refining, which leads to a decrease in productivity. Therefore, the N content may be 0.0001% or more, 0.0005% or more, or 0.0010% or more.
  • N is also an element effective for stabilizing austenite, and may be intentionally contained if necessary.
  • the N content is preferably 0.0100% or more, and may be 0.0200% or more and 0.0500% or more. However, excessive content of N may reduce toughness. Therefore, the N content is 0.2000% or less.
  • the N content may be 0.1500% or less, 0.1000% or less, or 0.0800% or less.
  • Oxygen (O) is an element mixed in the manufacturing process, and is preferable from the viewpoint of reducing inclusions formed with the R element according to the embodiment of the present invention, so that the O content is 0%. There may be. However, in order to reduce the O content to less than 0.0001%, it takes time for refining, which leads to a decrease in productivity. Therefore, the O content may be 0.0001% or more, 0.0005% or more, or 0.0010% or more. On the other hand, if O is excessively contained, coarse inclusions may be formed, the effective amount of the R element may be lowered, and the formability and / or toughness of the steel material may be lowered. Therefore, the O content is 0.0100% or less. The O content may be 0.0080% or less, 0.0060% or less, or 0.0040% or less.
  • the R element according to the embodiment of the present invention is La: 0 to 0.8000%, Ce: 0 to 0.8000%, Nd: 0 to 0.8000%, and Y: 0 to 0.8000%.
  • the R element according to the embodiment of the present invention is La: 0 to 0.8000%, Ce: 0 to 0.8000%, Nd: 0 to 0.8000%, and Y: 0 to 0.8000%.
  • Lanthanum (La), cerium (Ce), neodymium (Nd), and yttrium (Y) can exhibit a recrystallization inhibitory effect by being present in austenite in a solid solution state.
  • the metal structure in the finally obtained steel material can be refined even when hot rolling, particularly finish rolling, is performed at a relatively high temperature. For example, it is possible to improve the toughness evaluated by the Charpy impact characteristics and the like, and to greatly improve the productivity.
  • the R element may be used alone or in any specific combination of two or more of the above elements. Further, the R element may be present in an amount satisfying Equation 1, which will be described in detail later, and the lower limit thereof is not particularly limited. However, for example, the content of each R element or the total content may be 0.0010% or more, preferably 0.0050% or more, more preferably 0.0150% or more, and even more. It is preferably 0.0300% or more, and most preferably 0.0500% or more. On the other hand, even if the R element is excessively contained, the effect is saturated, and therefore, if the R element is contained in the steel material more than necessary, the manufacturing cost may increase.
  • each R element is 0.8000% or less, for example, 0.7000% or less, 0.6000% or less, 0.5000% or less, 0.4000% or less, or 0.3000% or less. May be good.
  • the total content of R element is 3.2000% or less, for example, 2.4000% or less, 1.6000% or less, 1.000% or less, 0.8000% or less, 0.6000% or less or 0. It may be 5000% or less.
  • the steel material may contain one or more of the following optional elements, if necessary.
  • the steel material has Nb: 0 to 3.000%, Ti: 0 to 0.500%, Ta: 0 to 0.500%, V: 0 to 1.00%, Cu: 0 to 3.00%, Ni: 0 to 60.00%, Cr: 0 to 30.00%, Mo: 0 to 5.00%, W: 0 to 2.00%, B: 0 to 0.0200%, Co: 0 to 3 It may contain one or more of 0.00%, Be: 0 to 0.050%, and Ag: 0 to 0.500%.
  • the steel materials include Zr: 0 to 0.5000%, Hf: 0 to 0.5000%, Ca: 0 to 0.0500%, Mg: 0 to 0.0500%, and Pr, Sm, Eu, Gd. At least one of Tb, Dy, Ho, Er, Tm, Yb, Lu, Pm, and Sc: 1 or 2 or more of 0 to 0.5000% in total may be contained. Further, the steel material may contain one or two of Sn: 0 to 0.300% and Sb: 0 to 0.300%. The steel materials are Te: 0 to 0.100%, Se: 0 to 0.100%, As: 0 to 0.050%, Bi: 0 to 0.500%, and Pb: 0 to 0.500%. One or more of them may be contained. Hereinafter, these optional elements will be described in detail.
  • Niobium (Nb) is an element that contributes to strengthening precipitation and suppressing recrystallization.
  • the Nb content may be 0%, but in order to obtain these effects, the Nb content is preferably 0.003% or more.
  • the Nb content may be 0.005% or more or 0.010% or more.
  • the Nb content may be 1.000% or more or 1.500% or more from the viewpoint of sufficiently strengthening precipitation.
  • the Nb content is 3.000% or less.
  • the Nb content may be 2.800% or less, 2.500% or less, or 2.000% or less.
  • the Nb content is preferably 0.100% or less, 0.080% or less, 0.050% or less, or 0.030. It may be less than or equal to%.
  • Titanium (Ti) is an element that contributes to improving the strength of steel materials by strengthening precipitation.
  • the Ti content may be 0%, but in order to obtain such an effect, the Ti content is preferably 0.005% or more.
  • the Ti content may be 0.010% or more, 0.050% or more, or 0.080% or more.
  • the Ti content is 0.500% or less.
  • the Ti content may be 0.300% or less, 0.200% or less, or 0.100% or less.
  • Tantalum (Ta) is an element effective in controlling the morphology of carbides and increasing their strength.
  • the Ta content may be 0%, but in order to obtain these effects, the Ta content is preferably 0.001% or more.
  • the Ta content may be 0.005% or more, 0.010% or more, or 0.050% or more.
  • the Ta content is 0.500% or less.
  • the Ta content may be 0.300% or less, 0.100% or less, or 0.080% or less.
  • Vanadium (V) is an element that contributes to improving the strength of steel materials by strengthening precipitation.
  • the V content may be 0%, but in order to obtain such an effect, the V content is preferably 0.001% or more.
  • the V content may be 0.01% or more, 0.02% or more, 0.05% or more, or 0.10% or more.
  • the V content is 1.00% or less.
  • the V content may be 0.80% or less, 0.60% or less, or 0.50% or less.
  • Copper (Cu) is an element that contributes to the improvement of strength and / or corrosion resistance.
  • the Cu content may be 0%, but in order to obtain these effects, the Cu content is preferably 0.001% or more.
  • the Cu content may be 0.01% or more, 0.10% or more, 0.15% or more, 0.20% or more, or 0.30% or more.
  • the Cu content is 3.00% or less.
  • the Cu content may be 2.00% or less, 1.50% or less, 1.00% or less, or 0.50% or less.
  • Nickel (Ni) is an element that contributes to the improvement of strength and / or heat resistance, and is also an effective austenite stabilizing element.
  • the Ni content may be 0%, but in order to obtain these effects, the Ni content is preferably 0.001% or more.
  • the Ni content may be 0.01% or more, 0.10% or more, 0.50% or more, 0.70% or more, 1.00% or more, or 3.00% or more.
  • the Ni content may be 30.00% or more, 35.00% or more, or 40.00% or more.
  • the deformation resistance during hot working increases in addition to the increase in alloy cost, which may increase the equipment load.
  • the Ni content is 60.00% or less.
  • the Ni content may be 55.00% or less or 50.00% or less.
  • the Ni content is 15.00% or less, 10.00% or less, 6.00% or less, or 4.00% or less. You may.
  • Chromium (Cr) is an element that contributes to the improvement of strength and / or corrosion resistance.
  • the Cr content may be 0%, but in order to obtain these effects, the Cr content is preferably 0.001% or more.
  • the Cr content may be 0.01% or more, 0.05% or more, 0.10% or more, or 0.50% or more.
  • the Cr content may be 10.00% or more, 12.00% or more, or 15.00% or more.
  • the Cr content is 30.00% or less.
  • the Cr content may be 28.00% or less, 25.00% or less, or 20.00% or less.
  • the Cr content may be 10.00% or less, 9.00% or less, or 7.50% or less.
  • Molybdenum is an element that enhances the hardenability of steel and contributes to the improvement of strength, and is also an element that contributes to the improvement of corrosion resistance.
  • the Mo content may be 0%, but in order to obtain these effects, the Mo content is preferably 0.001% or more.
  • the Mo content may be 0.01% or more, 0.02% or more, 0.50% or more, or 1.00% or more.
  • Mo content is 5.00% or less.
  • the Mo content may be 4.50% or less, 4.00% or less, 3.00 or less, or 1.50% or less.
  • Tungsten is an element that enhances the hardenability of steel and contributes to the improvement of strength.
  • the W content may be 0%, but in order to obtain such an effect, the W content is preferably 0.001% or more.
  • the W content may be 0.01% or more, 0.02% or more, 0.05% or more, 0.10% or more, or 0.50% or more.
  • the W content is 2.00% or less.
  • the W content may be 1.80% or less, 1.50% or less, or 1.00% or less.
  • B is an element that contributes to the improvement of strength.
  • the B content may be 0%, but in order to obtain such an effect, the B content is preferably 0.0001% or more.
  • the B content may be 0.0003% or more, 0.0005% or more, or 0.0007% or more.
  • the B content is 0.0200% or less.
  • the B content may be 0.0100% or less, 0.0050% or less, 0.0030% or less, or 0.0020% or less.
  • Co is an element that contributes to the improvement of hardenability and / or heat resistance.
  • the Co content may be 0%, but in order to obtain these effects, the Co content is preferably 0.001% or more.
  • the Co content may be 0.01% or more, 0.02% or more, 0.05% or more, 0.10% or more, or 0.50% or more.
  • the Co content is 3.00% or less.
  • the Co content may be 2.50% or less, 2.00% or less, 1.50% or less, or 0.80% or less.
  • Beryllium (Be) is an element effective for increasing the strength of the base metal and refining the structure.
  • the Be content may be 0%, but in order to obtain such an effect, the Be content is preferably 0.0003% or more.
  • the Be content may be 0.0005% or more, 0.001% or more, or 0.010% or more.
  • the Be content is 0.050% or less.
  • the Be content may be 0.040% or less, 0.030% or less, or 0.020% or less.
  • Silver (Ag) is an element effective for increasing the strength of the base material and refining the structure.
  • the Ag content may be 0%, but in order to obtain such an effect, the Ag content is preferably 0.001% or more.
  • the Ag content may be 0.010% or more, 0.020% or more, 0.030% or more, or 0.050% or more.
  • the Ag content is 0.500% or less.
  • the Ag content may be 0.400% or less, 0.300% or less, or 0.200% or less.
  • Zirconium (Zr) is an element that can control the morphology of sulfides.
  • the Zr content may be 0%, but in order to obtain such an effect, the Zr content is preferably 0.0001% or more.
  • the Zr content is 0.5000% or less.
  • Hafnium (Hf) is an element that can control the morphology of sulfides.
  • the Hf content may be 0%, but in order to obtain such an effect, the Hf content is preferably 0.0001% or more.
  • the Hf content is 0.5000% or less.
  • Ca 0-0.0500%
  • Ca is an element that can control the morphology of sulfides.
  • the Ca content may be 0%, but in order to obtain such an effect, the Ca content is preferably 0.0001% or more.
  • the Ca content is 0.0500% or less.
  • Magnesium (Mg) is an element that can control the morphology of sulfides.
  • the Mg content may be 0%, but in order to obtain such an effect, the Mg content is preferably 0.0001% or more.
  • the Mg content may be greater than 0.0015%, greater than 0.0016%, greater than or equal to 0.0018% or greater than or equal to 0.0020%.
  • the Mg content is 0.0500% or less.
  • the Mg content may be 0.0400% or less, 0.0300% or less, or 0.0200% or less.
  • Placeodim [At least one of Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pm, and Sc: 0 to 0.5000% in total] Placeodim (Pr), Samalium (Sm), Europium (Eu), Gadrinium (Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Lutetium (Er), Thulium (Tm), Itterbium (Yb), Lutetium (Lu), promethium (Pm), and scandium (Sc) are elements that can control the morphology of sulfides, similar to Ca and Mg.
  • the total content of at least one of Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pm, and Sc may be 0%, but such an effect can be achieved. In order to obtain it, it is preferably 0.0001% or more.
  • the total content of at least one of Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pm, and Sc is 0.0002% or more, 0.0003% or more, or 0. It may be 0004% or more. On the other hand, even if these elements are excessively contained, the effect is saturated, and therefore, including these elements in the steel material more than necessary may lead to an increase in manufacturing cost.
  • the total content of at least one of Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pm, and Sc is 0.5000% or less, 0.4000%. Hereinafter, it may be 0.3000% or less or 0.2000% or less.
  • Tin (Sn) is an element effective for improving corrosion resistance.
  • the Sn content may be 0%, but in order to obtain such an effect, the Sn content is preferably 0.001% or more.
  • the Sn content may be 0.010% or more, 0.020% or more, 0.030% or more, or 0.050% or more.
  • the Sn content is 0.300% or less.
  • the Sn content may be 0.250% or less, 0.200% or less, or 0.150% or less.
  • Antimony (Sb) is an element effective for improving corrosion resistance like Sn, and the effect can be increased by including it in combination with Sn.
  • the Sb content may be 0%, but in order to obtain the effect of improving the corrosion resistance, the Sb content is preferably 0.001% or more.
  • the Sb content may be 0.010% or more, 0.020% or more, 0.030% or more, or 0.050% or more.
  • excessive content of Sb may lead to a decrease in toughness, particularly low temperature toughness. Therefore, the Sb content is 0.300% or less.
  • the Sb content may be 0.250% or less, 0.200% or less, or 0.150% or less.
  • Tellurium is an element effective for improving the machinability of steel because it forms a low melting point compound with Mn, S and the like to enhance the lubricating effect.
  • the Te content may be 0%, but in order to obtain such an effect, the Te content is preferably 0.001% or more.
  • the Te content may be 0.010% or more, 0.020% or more, 0.030% or more, or 0.040% or more.
  • the Te content is 0.100% or less.
  • the Te content may be 0.090% or less, 0.080% or less, or 0.070% or less.
  • Selenium (Se) is an effective element for improving the machinability of steel because the selenium produced in the steel changes the shear-plastic deformation of the work material and the chips are easily crushed. ..
  • the Se content may be 0%, but in order to obtain such an effect, the Se content is preferably 0.001% or more.
  • the Se content may be 0.010% or more, 0.020% or more, 0.030% or more, or 0.040% or more.
  • the Se content is 0.100% or less.
  • the Se content may be 0.090% or less, 0.080% or less, or 0.070% or less.
  • Arsenic (As) is an element effective in improving the machinability of steel.
  • the As content may be 0%, but in order to obtain such an effect, the As content is preferably 0.001% or more.
  • the As content may be 0.005% or more or 0.010% or more.
  • the As content is 0.050% or less.
  • the As content may be 0.040% or less, 0.030% or less, or 0.020% or less.
  • Bismuth (Bi) is an element effective in improving the machinability of steel.
  • the Bi content may be 0%, but in order to obtain such an effect, the Bi content is preferably 0.001% or more.
  • the Bi content may be 0.010% or more, 0.020% or more, 0.030% or more, or 0.050% or more.
  • the Bi content is 0.500% or less.
  • the Bi content may be 0.400% or less, 0.300% or less, or 0.200% or less.
  • Pb 0 to 0.500%
  • Lead (Pb) is an element effective for improving the machinability of steel because it melts when the temperature rises due to cutting and promotes the growth of cracks.
  • the Pb content may be 0%, but in order to obtain such an effect, the Pb content is preferably 0.001% or more.
  • the Pb content may be 0.010% or more, 0.020% or more, 0.030% or more, or 0.050% or more.
  • the Pb content is 0.500% or less.
  • the Pb content may be 0.400% or less, 0.300% or less, or 0.200% or less.
  • the balance other than the above elements consists of Fe and impurities.
  • Impurities are components that are mixed in by various factors in the manufacturing process, including raw materials such as ore and scrap, when steel materials are industrially manufactured.
  • the effective amount of the R element consisting of La, Ce, Nd, and Y is determined by the left side of the following formula 1, and the value thereof satisfies the following formula 1. 0.40 [La] +0.40 [Ce] +0.39 [Nd] +0.63 [Y] -2.33 [O] -1.74 [S] -1.80 [P] ⁇ 0.0003 ⁇ . ⁇ ⁇ Equation 1
  • [La], [Ce], [Nd], [Y], [O], [S], and [P] are the content [mass%] of each element, and the element is not contained. Is 0.
  • the amount of these elements existing in the solid solution state in the steel can be increased, so that the recrystallization of the austenite crystal grains is suppressed. Alternatively, it can be delayed, and the recrystallization start temperature can be shifted to the higher temperature side due to such suppression or delay of recrystallization. More specifically, these R elements (hereinafter, also simply referred to as “R”) are combined with O (oxygen), S (sulfur), and P (phosphorus) present in steel to form an oxide (R 2 ). It tends to form inclusions consisting of O 3 ), sulfides (RS), and phosphites (RP).
  • R oxygen
  • S sulfur
  • P phosphorus
  • the amount of R element existing in the steel in a solid solution state without forming inclusions is determined. Need to increase.
  • the solid solution amount of the R element in the steel is obtained by subtracting the maximum amount that can be consumed to form inclusions (oxides, sulfides, and phosphates) from the amount of the R element contained in the steel. It is possible to estimate by. Therefore, in the embodiment of the present invention, the solid solution amount of the R element estimated in this way is the amount of the R element effective for suppressing the recrystallization of the austenite crystal grains (that is, the "effective amount of the R element". ), And specifically, it is defined by the following formula A.
  • R element [atomic%] ⁇ (M [Fe] / M [R] ) x [R]-(M [Fe] / M [O] ) x [O] x 2 / 3- (M [ ] Fe] / M [S] ) ⁇ [S]-(M [Fe] / M [P] ) ⁇ [P] ⁇ ⁇ ⁇ Equation A
  • R represents each R element of La, Ce, Nd, and Y
  • M [R] is the atomic weight of the R element
  • M [Fe] is the atomic weight of Fe
  • M [O] is the atomic weight of O
  • M [ S] represents the atomic weight of S
  • M [P] represents the atomic weight of P
  • [R], [O], [S] and [P] are the content [mass%] of the corresponding elements, respectively. If it does not contain, it is 0.
  • the steel material according to the embodiment of the present invention contains various alloying elements, the steel material as a whole is almost composed of Fe or is an optional element.
  • the steel material is almost composed of Ni and / or Cr in addition to Fe. Is.
  • the atomic weights of Ni and Cr are equivalent to the atomic weights of Fe.
  • the atomic% of each R element of La, Ce, Nd, and Y is approximately the content of each R element [ It can be calculated by multiplying [% by mass] by the ratio of the atomic weight of Fe to the atomic weight of each R element, that is, (M [Fe] / M [R] ) ⁇ [R]. Therefore, by summing up the amounts of each R element calculated by (M [ Fe ] / M [R ] ) ⁇ [R] (that is, ⁇ (M [Fe] / M [R] ) ⁇ [R]). By calculation), the atomic% of the entire R element can be calculated.
  • R element [atomic%] ⁇ (M [Fe] / M [R] ) x [R]-(M [Fe] / M [O] ) x [O] x 2 / 3- (M [ ] Fe] / M [S] ) ⁇ [S]-(M [Fe] / M [P] ) ⁇ [P] ⁇ ⁇ ⁇ Equation A
  • the atomic weights of Fe, O, S and P and each R element are Fe: 55.845, O: 15.9994, S: 32.068, P: 30.973762, La: 138.90547, Ce, respectively. : 140.116, Nd: 144.242, Y: 88.90585. Therefore, by substituting the atomic weight of each element into the above formula A and rearranging it, the effective amount of the R element in terms of atomic% can be approximately expressed by the following formula B.
  • Effective amount 0.40 [La] +0.40 [Ce] +0.39 [Nd] +0.63 [Y] -2.33 [O] -1.74 [S] -1.80 [P] ... ⁇ Equation B
  • [La], [Ce], [Nd], [Y], [O], [S], and [P] are the content [mass%] of each element, and the element is not contained. Is 0.
  • the effective amount of the R element obtained by the above formula B is 0.0003% or more, that is, the following formula 1 is satisfied. .. 0.40 [La] +0.40 [Ce] +0.39 [Nd] +0.63 [Y] -2.33 [O] -1.74 [S] -1.80 [P] ⁇ 0.0003 ⁇ . ⁇ ⁇ Equation 1
  • the effective amount of the R element may be, for example, 0.0005% or more or 0.0007% or more, preferably 0.0010% or more, more preferably 0.0015% or more, still more preferably 0.0030%.
  • the above is most preferably 0.0050% or more or 0.0100% or more. Further, as is clear from the above formula 1, in order to stably secure the effective amount, it is preferable to reduce the contents of O, S and P in the steel as much as possible.
  • the upper limit of the effective amount of the R element is not particularly limited, but even if the effective amount of the R element is excessively increased, the effect is saturated and the manufacturing cost increases (alloy cost due to the increase in the content of the R element). And / or an increase in the refining cost for O, S and P), which is not always preferable. Therefore, the effective amount of R element is 2.000% or less, for example, even if it is 1.8000% or less, 1.5000% or less, 1.2000% or less, 1.000% or less, or 0.8000% or less. good.
  • the steel material according to the embodiment of the present invention may be any steel material and is not particularly limited.
  • the steel material according to the embodiment of the present invention is, for example, a steel material before exhibiting the recrystallization suppressing effect, for example, slabs, billets, blooms which are steel materials before hot rolling, and a steel material after exhibiting the recrystallization suppressing effect.
  • it includes a steel material after hot rolling.
  • the steel material after hot rolling is not particularly limited, but includes, for example, thick steel plates, thin steel plates, steel bars, wire rods, shaped steels, steel pipes, and the like.
  • the steel material according to the embodiment of the present invention can be manufactured by any suitable method known to those skilled in the art, depending on the form of the final product and the like.
  • the manufacturing method includes a step generally applied when manufacturing the thick steel plate, for example, a step of casting a slab having the chemical composition described above, and casting.
  • a step of hot rolling the slab including a step of finish rolling ending at a temperature lower than the recrystallization start temperature, and a step of cooling the obtained rolled material, and an appropriate heat treatment step as necessary. It may further include a tempering step and the like.
  • the steel material according to the embodiment of the present invention is particularly suitable for applying a thermal processing control process (TMCP) that combines controlled rolling and accelerated cooling.
  • TMCP thermal processing control process
  • the manufacturing method includes a step generally applied when manufacturing the thin steel plate, for example, a step of casting a slab having the chemical composition described above, and casting.
  • a step of hot rolling a slab including a finish rolling that ends at a temperature lower than the recrystallization start temperature, a step of cooling and winding the obtained rolled material, and a cold rolling step if necessary.
  • the baking step and the like may be further included.
  • a step generally applied when manufacturing steel bars and other steel materials is included, and for example, a steelmaking process for forming a molten steel having the chemical composition described above is formed. A process of casting slabs, billets, blooms, etc.
  • molten steel having various chemical compositions was melted using a vacuum melting furnace, and an ingot of about 50 kg was manufactured by a lump formation method.
  • the chemical compositions obtained by analyzing the samples collected from each of the obtained ingots are as shown in Table 1 below.
  • a compression processing test was carried out using a cylindrical test material ( ⁇ 8 mm ⁇ height 12 mm) obtained from the ingot, and the recrystallization suppressing effect of the steel material was obtained based on the softening rate calculated from the result of the test. evaluated.
  • Comparative Examples 84 to 90 the effective amount of the R element composed of La, Ce, Nd, and Y was low, so that a sufficient recrystallization suppressing effect could not be exhibited. More specifically, in Comparative Example 84, since the R element was not contained, a sufficient recrystallization suppressing effect could not be exhibited. Further, in Comparative Examples 85 to 90, although the above R element was contained, the content thereof was small due to the relative relationship with O, S and / or P, in other words, O, S and O, S and O with respect to the R element. It is probable that a relatively large amount of inclusions were formed between the R element and these elements due to the excessive content of / or P.
  • the steel material according to the embodiment of the present invention is, for example, a steel material before hot rolling, such as slab, billet, bloom, or a steel material after hot rolling.
  • Steel materials after hot rolling include, for example, thick steel plates used for bridges, construction, shipbuilding, pressure vessels, etc., thin steel plates used for automobiles, home appliances, etc., as well as steel bars, wire rods, and shaped steel. , And steel pipes and the like.
  • the steel material according to the embodiment of the present invention is applied to these materials, the steel material can be manufactured without impairing the productivity due to the recrystallization suppressing effect, and the metal structure in the steel material is miniaturized. Therefore, it is possible to remarkably improve the properties related to the miniaturization of such a metal structure, for example, toughness.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention fournit un matériau d'acier qui présente une composition chimique prédéfinie satisfaisant ０,４０［Ｌａ］＋０,４０［Ｃｅ］＋０,３９［Ｎｄ］＋０,６３［Ｙ］－２,３３［Ｏ］－１,７４［Ｓ］－１,８０［Ｐ］≧０,０００３ (dans la formule, ［Ｌａ］, ［Ｃｅ］, ［Ｎｄ］, ［Ｙ］, ［Ｏ］, ［Ｓ］ et ［Ｐ］ représentent la teneur (en % en masse) de chaque élément).
PCT/JP2021/014781 2020-12-28 2021-04-07 Matériau d'acier WO2022145068A1 (fr)

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CN117418169A (zh) * 2023-12-15 2024-01-19 北京科技大学 一种抗点蚀316l不锈钢及其制备方法

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WO2016204005A1 (fr) * 2015-06-15 2016-12-22 新日鐵住金株式会社 Acier inoxydable austénitique à haute teneur en chrome
JP2019183208A (ja) * 2018-04-05 2019-10-24 日鉄ステンレス株式会社 完全オーステナイト系ステンレス鋼
WO2020137812A1 (fr) * 2018-12-26 2020-07-02 Ｊｆｅスチール株式会社 Acier pour environnements à hydrogène gazeux à haute pression, structure en acier pour environnements à hydrogène gazeux à haute pression et procédé de production d'acier pour environnements à hydrogène gazeux à haute pression
WO2020203159A1 (fr) * 2019-03-29 2020-10-08 日本製鉄株式会社 Tôle d'acier et son procédé de fabrication
WO2020203158A1 (fr) * 2019-03-29 2020-10-08 日本製鉄株式会社 Tôle d'acier
JP2020531689A (ja) * 2017-08-23 2020-11-05 宝山鋼鉄股▲分▼有限公司 低温圧力容器用鋼及びその製造方法

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WO2016204005A1 (fr) * 2015-06-15 2016-12-22 新日鐵住金株式会社 Acier inoxydable austénitique à haute teneur en chrome
JP2020531689A (ja) * 2017-08-23 2020-11-05 宝山鋼鉄股▲分▼有限公司 低温圧力容器用鋼及びその製造方法
JP2019183208A (ja) * 2018-04-05 2019-10-24 日鉄ステンレス株式会社 完全オーステナイト系ステンレス鋼
WO2020137812A1 (fr) * 2018-12-26 2020-07-02 Ｊｆｅスチール株式会社 Acier pour environnements à hydrogène gazeux à haute pression, structure en acier pour environnements à hydrogène gazeux à haute pression et procédé de production d'acier pour environnements à hydrogène gazeux à haute pression
WO2020203159A1 (fr) * 2019-03-29 2020-10-08 日本製鉄株式会社 Tôle d'acier et son procédé de fabrication
WO2020203158A1 (fr) * 2019-03-29 2020-10-08 日本製鉄株式会社 Tôle d'acier

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117418169A (zh) * 2023-12-15 2024-01-19 北京科技大学 一种抗点蚀316l不锈钢及其制备方法
CN117418169B (zh) * 2023-12-15 2024-03-08 北京科技大学 一种抗点蚀316l不锈钢及其制备方法

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