WO2022108170A1 - 열간가공성이 우수한 고강도 오스테나이트계 스테인리스강 - Google Patents
열간가공성이 우수한 고강도 오스테나이트계 스테인리스강 Download PDFInfo
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- WO2022108170A1 WO2022108170A1 PCT/KR2021/015395 KR2021015395W WO2022108170A1 WO 2022108170 A1 WO2022108170 A1 WO 2022108170A1 KR 2021015395 W KR2021015395 W KR 2021015395W WO 2022108170 A1 WO2022108170 A1 WO 2022108170A1
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- stainless steel
- austenitic stainless
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 28
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000001556 precipitation Methods 0.000 claims abstract description 22
- 239000011651 chromium Substances 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 229910052748 manganese Inorganic materials 0.000 claims description 13
- 229910052750 molybdenum Inorganic materials 0.000 claims description 13
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 229910052759 nickel Inorganic materials 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 229910052796 boron Inorganic materials 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 239000011572 manganese Substances 0.000 description 25
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 18
- 239000010949 copper Substances 0.000 description 15
- 229910000859 α-Fe Inorganic materials 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000005098 hot rolling Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 230000006866 deterioration Effects 0.000 description 8
- 238000000137 annealing Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 7
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910000765 intermetallic Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000002436 steel type Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
Definitions
- the present invention relates to high-strength austenitic stainless steel having excellent hot workability, and more particularly, to high-strength austenitic stainless steel having excellent hot workability, excellent surface quality during manufacturing, and high hardness.
- Austenitic stainless steel among the materials of parts materials has excellent elongation, so there is no problem in making complex shapes, and it has excellent work hardenability, so it is a steel type applied in various fields. These austenitic stainless steels can improve their strength by utilizing interstitial elements that prevent the movement of dislocations when stress is applied.
- carbon and nitrogen are inexpensive component elements and are very useful elements for improving strength without increasing cost.
- carbon and nitrogen greatly increase the degree of stabilization of the austenite phase, they act to reduce the generation of delta ferrite during solidification, and lead to deterioration of hot workability during hot rolling.
- An object of the present invention is to provide a high-strength austenitic stainless steel having high hardness while preventing deterioration of the hot workability of the austenitic stainless steel.
- High-strength austenitic stainless steel having excellent hot workability is, by weight, C: 0.01 to 0.035%, Si: 0.5% or less, Mn: 0.5 to 1.5%, Cr: 17 to 22%, Ni: 6 to 11%, Mo: 1% or less, Cu: 1% or less, N: 0.1 to 0.22%, the remaining Fe and unavoidable impurities, and the value of the following formula (1) is 1.9 or more, or chromium nitride
- the precipitation temperature may satisfy the value below the value expressed by the following formula (2).
- the number of surface cracks may be 0.3 or less per unit meter (m).
- the high-strength austenitic stainless steel having excellent hot workability may have a hardness of 190 Hv or more.
- P 0.05% or less
- S 0.01% or less
- Al 0.1% or less
- Ti 0.01% or less
- B 0.005% or less
- High-strength austenitic stainless steel with excellent hot workability can secure high strength by utilizing interstitial elements, and at the same time form ferrite during solidification to improve strength without deterioration of surface quality.
- the high-strength austenitic stainless steel with excellent hot workability can suppress cracks occurring during hot working by controlling the precipitation temperature of the CrN phase, and the subsequent surface machining process for securing surface quality can be omitted. This can reduce the process cost.
- High-strength austenitic stainless steel having excellent hot workability is, by weight, C: 0.01 to 0.035%, Si: 0.5% or less, Mn: 0.5 to 1.5%, Cr: 17 to 22%, Ni: 6 to 11%, Mo: 1% or less, Cu: 1% or less, N: 0.1 to 0.22%, the remaining Fe and unavoidable impurities, and the value of the following formula (1) is 1.9 or more, or chromium nitride
- the precipitation temperature may satisfy the value below the value expressed by the following formula (2).
- High-strength austenitic stainless steel having excellent hot workability by weight, C: 0.01 to 0.035%, Si: 0.5% or less, Mn: 0.5 to 1.5%, Cr: 17 to 22% , Ni: 6 to 11%, Mo: 1% or less, Cu: 1% or less, N: 0.1 to 0.22%, remaining Fe and unavoidable impurities.
- the content of carbon (C) is 0.01 to 0.035%.
- C is a representative interstitial element and is an element effective in improving strength. Addition of 0.01% or more is required to improve strength. However, when the content is excessive, there is a problem of lowering the hot workability because the formation of delta ferrite during solidification is suppressed due to the austenite stabilization effect. Therefore, it is preferable to limit it to 0.035% or less in order to secure hot workability.
- the content of silicon (Si) is 0.5% or less.
- Si is a ferrite stabilizing element and has the effect of reducing the decrease in the ferrite phase due to the addition of C and N. However, if it is excessively added, it is preferable to limit it to 0.5% or less because it promotes precipitation of intermetallic compounds such as sigma ( ⁇ ) phase and deteriorates mechanical properties and corrosion resistance.
- the content of manganese (Mn) is 0.5 to 1.5%.
- the content of chromium (Cr) is 17 to 22%.
- Cr is the most important element for improving the corrosion resistance of stainless steel. In addition, it is preferable to contain 17% or more as an important element for strength improvement.
- Cr is a ferrite phase stabilizing element, and when the content is excessive, the degree of stabilization of the austenite phase is decreased, which accompanies an increase in the content of Ni, so there is a problem in that the manufacturing cost increases.
- there is a problem in that mechanical properties and corrosion resistance are lowered by precipitation of an intermetallic compound such as ⁇ phase and in the present invention, it is preferable to limit the upper limit to 22%.
- the content of nickel (Ni) is 6 to 11%.
- Ni is the most powerful element among the austenitic phase stabilizing elements, and should be contained in an amount of 6% or more in order to secure sufficient austenitic phase stabilization in austenitic stainless steels. However, since an increase in the Ni content is directly related to an increase in the raw material price, it is preferable to limit it to 11% or less.
- the content of molybdenum (Mo) is 1% or less.
- Mo is an element useful for improving corrosion resistance, but it is an expensive component element, and when added in a large amount, it causes an increase in cost. In addition, there is a problem in that mechanical properties and corrosion resistance are deteriorated by precipitation of intermetallic compounds such as ⁇ phase, and it is preferable to limit the content to 1% or less in the present invention.
- the content of copper (Cu) is 1% or less.
- Cu is a useful element for stabilizing the austenite phase, and may be used by substituting expensive nickel. However, when a large amount is added, it forms a low-melting-point phase and deteriorates the hot workability, thereby reducing the surface quality. Therefore, it is preferable to limit it to 1% or less.
- the content of nitrogen (N) is 0.1 to 0.22%.
- N is a low-cost element and a useful element for strength improvement, and is an essential element in high-strength austenitic stainless steel. Therefore, it is necessary to add 0.1% or more. However, when a large amount is added, it is preferable to limit it to 0.22% or less, because it promotes the generation of chromium nitride (CrN) and reduces the hot workability to reduce the surface quality of the steel.
- CrN chromium nitride
- Austenitic stainless steel contains P: 0.05% or less, S: 0.01% or less, Al: 0.1% or less, Ti: 0.01% or less, B: 0.005% or less, in addition to the alloy components described above. and more preferably P: 0.035% or less, S: 0.0035% or less, Al: 0.04% or less, Ti: 0.003% or less, B: 0.0025% or less.
- the content of phosphorus (P) is 0.05% or less, and the content of sulfur (S) is 0.01% or less.
- P and S are impurities that are unavoidably contained in steel, and when their content exceeds 0.05% and 0.01%, respectively, there is a fear that they may segregate in steel and cause surface cracks. Therefore, P and S can be controlled to be 0.05% or less and 0.01% or less, respectively, and more preferably, 0.035% or less and 0.0035% or less.
- the content of aluminum (Al) is 0.1% or less.
- Al improves the high temperature oxidation resistance. However, when a large amount is added, the surface quality deteriorates due to the formation of Al inclusions. Therefore, Al can be controlled to 0.1% or less, and more preferably to 0.04% or less.
- the content of titanium (Ti) is 0.01% or less.
- Ti prevents high-temperature corrosion during heating of the slab, thereby preventing the occurrence of surface cracks during hot rolling. However, when a large amount is added, coarse precipitates are formed, which may cause a problem of lowering impact toughness. Therefore, Ti can be controlled to 0.01% or less, and more preferably, to 0.003% or less.
- the content of boron (B) is 0.005% or less.
- the B content can be controlled to 0.005% or less, and more preferably to 0.0025% or less.
- the remainder of the stainless steel except for the above-mentioned alloying elements consists of Fe and other unavoidable impurities.
- Austenitic stainless steel forms a small amount of delta ferrite upon solidification to prevent hot cracking.
- C and N serve to reduce the amount of delta ferrite, when C and N are added, the occurrence of hot cracks due to the reduction of delta ferrite tends to increase.
- the strength of austenitic stainless steel is increased by adding C and N, and at this time, deterioration of hot workability due to reduction in delta ferrite during solidification is prevented through securing ferrite content or controlling chromium nitride (CrN) phase did
- Equation (1) has a value less than 1.9, cracks occur on the surface due to deterioration of hot workability. On the other hand, when Equation (1) has a value of 1.9 or more, the number of surface cracks after hot rolling annealing is 0.3 or less per unit meter (m).
- Equation (1) it is possible to secure the surface quality through the improvement of hot workability by utilizing Equation (1), but the range of its components tends to be limited. Therefore, other factors other than delta ferrite were examined, and the correlation of surface quality according to the precipitation temperature of the CrN phase was derived.
- N increases the precipitation temperature of the CrN phase, and the increase in the precipitation temperature causes the CrN phase to remain during hot rolling, thereby lowering the hot workability.
- the precipitation temperature of CrN phase can be experimentally evaluated using calorimetric evaluation equipment such as TGA and DSC, or it can be derived through numerical calculation using a phase transformation analysis program.
- the decomposition limit temperature of the CrN phase was derived as shown in Equation (2), and it was confirmed that the hot workability was improved when the precipitation temperature of the CrN phase was below the decomposition limit temperature.
- Equation (2) When the value of Equation (2) is less than the precipitation temperature (°C) of chromium nitride (CrN), cracks occur on the surface due to deterioration of hot workability. On the other hand, when the value of Equation (2) is equal to or higher than the precipitation temperature (°C) of chromium nitride (CrN), it is possible to provide a hot-rolled annealed material having a surface crack number of 0.3 or less per unit meter (m).
- the austenitic stainless steel may have a hardness of 190 Hv or more and a number of surface cracks of 0.3 or less per unit meter (m) after hot rolling annealing.
- the method for manufacturing high-strength austenitic stainless steel having excellent hot workability may be manufactured through a general process of austenitic stainless steel, in wt%, C: 0.01 to 0.035%, Si: 0.5% or less, Mn: 0.5 to 1.5%, Cr: 17 to 22%, Ni: 6 to 11%, Mo: 1% or less, Cu: 1% or less, N: 0.1 to 0.22%, remaining Fe and unavoidable impurities containing It includes the step of hot-rolling the slab and annealing the hot-rolled steel sheet that has been subjected to the hot-rolling step.
- the slab satisfies at least one of Equations (1) and (2) to improve hot workability, and more specifically, the number of surface cracks after annealing may be 0.3 or less per unit meter (m).
- the hardness of the hot-rolled annealed material may be made of 190 Hv or more.
- Equations (1) and (2) are the same as described above, and thus will be omitted.
- Table 3 shows the values of formulas (1) and (2) of the steel types shown in Tables 1 and 2, and the precipitation temperature of the CrN phase.
- the precipitation temperature of the CrN phase can be experimentally evaluated using calorific evaluation equipment such as TGA and DSC, and it can be derived through numerical calculation using a phase transformation analysis program.
- the values in Table 3 are the values calculated using the phase transformation analysis program.
- Table 3 shows the results of evaluating the number of surface defects and hardness after manufacturing 4-8 mmt hot-rolled coils for each component.
- the number of defects is obtained by dividing the total number of surface defects by the coil length after annealing and pickling in a hot-rolled coil to obtain the number of defects per unit meter. Usually, when the number is 0.3 or less, it is judged as a material with excellent surface quality. Hv hardness was evaluated for hardness, and the load was 10 kgf, the measurement interval was 1 mm, and the reduction time was 10 sec.
- the hot-rolled annealed steel sheets of grades 1 to 10 showed good surface quality as the value of Equation (1) was 1.9 or more and the number of surface cracks was 0.24/m or less.
- the value of formula (1) was less than 1.9, but the CrN precipitation temperature was less than the value of formula (2), and the number of surface cracks was 0.25 pieces/m or less, showing good surface quality.
- Equation (1) was less than 1.9, and the CrN precipitation temperature exceeded the value of Equation (2), so that the number of cracks increased.
- Equation (1) when the value of Equation (1) is 1.9 or more or the CrN precipitation temperature is less than or equal to the value of Equation (2), it can be seen that the hot workability of the austenitic stainless steel is improved and the number of surface defects is reduced.
- the hardness of the hot-rolled annealed steel sheet of 1 to 29 steels satisfying the alloy composition of the present invention was 190 Hv or more.
- the austenitic stainless steel according to the present invention can secure high strength and, at the same time, form ferrite during solidification to improve strength without deterioration of surface quality, suppress cracks generated during hot working, and secure surface quality It is possible to omit the subsequent surface processing for
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Abstract
Description
구분 | 강종 No. |
C | Si | Mn | P | S | Cr | Ni | Mo | Cu | N | Al | Ti | B |
발명예 | 1 | 0.020 | 0.48 | 0.70 | 0.030 | 0.0011 | 21.4 | 10.6 | 0.64 | 0.95 | 0.198 | 0.003 | 0.002 | 0.0023 |
2 | 0.016 | 0.48 | 0.99 | 0.032 | 0.0010 | 21.6 | 10.9 | 0.52 | 0.83 | 0.195 | 0.003 | 0.002 | 0.0023 | |
3 | 0.013 | 0.48 | 1.36 | 0.028 | 0.0010 | 17.0 | 6.8 | 0.50 | 0.49 | 0.131 | 0.003 | 0.002 | 0.0023 | |
4 | 0.010 | 0.32 | 1.24 | 0.008 | 0.0035 | 17.4 | 6.7 | 0.32 | 0.29 | 0.137 | 0.004 | 0.002 | 0.0025 | |
5 | 0.030 | 0.50 | 0.94 | 0.010 | 0.0005 | 21.5 | 10.8 | 0.59 | 0.85 | 0.190 | 0.003 | 0.002 | 0.0023 | |
6 | 0.016 | 0.30 | 0.86 | 0.034 | 0.0011 | 21.2 | 10.6 | 0.57 | 0.95 | 0.198 | 0.003 | 0.002 | 0.0023 | |
7 | 0.021 | 0.41 | 1.49 | 0.030 | 0.0007 | 17.4 | 6.5 | 0.00 | 0.23 | 0.132 | 0.003 | 0.002 | 0.0023 | |
8 | 0.023 | 0.48 | 1.42 | 0.030 | 0.0008 | 17.4 | 6.7 | 0.07 | 0.05 | 0.136 | 0.003 | 0.002 | 0.0023 | |
9 | 0.019 | 0.32 | 0.90 | 0.029 | 0.0012 | 21.4 | 10.7 | 0.53 | 0.70 | 0.202 | 0.003 | 0.002 | 0.0023 | |
10 | 0.024 | 0.48 | 0.88 | 0.025 | 0.0009 | 21.2 | 10.7 | 0.59 | 0.99 | 0.206 | 0.003 | 0.002 | 0.0023 | |
11 | 0.011 | 0.32 | 0.75 | 0.022 | 0.0012 | 21.2 | 10.7 | 0.61 | 0.71 | 0.219 | 0.003 | 0.002 | 0.0023 | |
12 | 0.034 | 0.32 | 0.84 | 0.032 | 0.0011 | 21.2 | 10.4 | 0.75 | 0.71 | 0.211 | 0.003 | 0.002 | 0.0023 | |
13 | 0.035 | 0.33 | 0.72 | 0.030 | 0.0010 | 21.6 | 10.9 | 0.61 | 0.88 | 0.207 | 0.003 | 0.002 | 0.0023 | |
14 | 0.032 | 0.35 | 0.75 | 0.032 | 0.0007 | 21.5 | 10.8 | 0.72 | 0.73 | 0.213 | 0.004 | 0.003 | 0.0019 |
구분 | 강종No. | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | N | Al | Ti | B |
발명예 | 15 | 0.023 | 0.37 | 0.70 | 0.029 | 0.0011 | 21.3 | 10.9 | 0.71 | 0.79 | 0.211 | 0.004 | 0.003 | 0.0019 |
16 | 0.024 | 0.31 | 1.49 | 0.032 | 0.0009 | 17.2 | 6.4 | 0.02 | 0.07 | 0.131 | 0.004 | 0.003 | 0.0020 | |
17 | 0.022 | 0.38 | 1.21 | 0.032 | 0.0011 | 17.3 | 7.0 | 0.36 | 0.34 | 0.146 | 0.002 | 0.003 | 0.0020 | |
18 | 0.018 | 0.41 | 1.24 | 0.034 | 0.0011 | 17.2 | 6.6 | 0.01 | 0.17 | 0.141 | 0.003 | 0.002 | 0.0021 | |
19 | 0.010 | 0.30 | 1.24 | 0.034 | 0.0011 | 17.0 | 6.6 | 0.40 | 0.25 | 0.155 | 0.004 | 0.002 | 0.0019 | |
20 | 0.018 | 0.34 | 1.31 | 0.030 | 0.0008 | 17.2 | 7.0 | 0.20 | 0.49 | 0.132 | 0.004 | 0.002 | 0.0019 | |
21 | 0.033 | 0.33 | 0.71 | 0.025 | 0.0006 | 21.2 | 10.8 | 0.53 | 0.95 | 0.194 | 0.003 | 0.002 | 0.0019 | |
22 | 0.019 | 0.32 | 0.72 | 0.030 | 0.0012 | 21.3 | 10.7 | 0.50 | 0.81 | 0.213 | 0.003 | 0.003 | 0.0019 | |
23 | 0.030 | 0.38 | 0.71 | 0.029 | 0.0011 | 21.2 | 10.8 | 0.57 | 0.71 | 0.206 | 0.003 | 0.003 | 0.0020 | |
24 | 0.017 | 0.32 | 0.83 | 0.034 | 0.0021 | 21.2 | 10.8 | 0.74 | 0.71 | 0.220 | 0.004 | 0.003 | 0.0020 | |
25 | 0.025 | 0.50 | 1.27 | 0.032 | 0.0007 | 17.2 | 6.8 | 0.46 | 0.02 | 0.159 | 0.004 | 0.003 | 0.0021 | |
26 | 0.030 | 0.31 | 0.71 | 0.033 | 0.0012 | 21.3 | 11.0 | 0.66 | 0.90 | 0.207 | 0.002 | 0.002 | 0.0023 | |
27 | 0.030 | 0.39 | 1.30 | 0.031 | 0.0011 | 17.5 | 6.8 | 0.08 | 0.01 | 0.145 | 0.003 | 0.002 | 0.0023 | |
28 | 0.029 | 0.32 | 1.26 | 0.020 | 0.0018 | 17.1 | 6.8 | 0.49 | 0.39 | 0.147 | 0.003 | 0.002 | 0.0019 | |
29 | 0.024 | 0.33 | 1.28 | 0.018 | 0.0011 | 17.1 | 7.0 | 0.02 | 0.16 | 0.159 | 0.003 | 0.003 | 0.0019 | |
비교예 | 30 | 0.021 | 0.42 | 1.40 | 0.034 | 0.0028 | 17.0 | 6.6 | 0.09 | 0.26 | 0.130 | 0.004 | 0.003 | 0.0019 |
31 | 0.035 | 0.35 | 0.96 | 0.024 | 0.0016 | 21.2 | 10.6 | 0.55 | 0.93 | 0.196 | 0.003 | 0.002 | 0.0023 | |
32 | 0.023 | 0.45 | 0.89 | 0.029 | 0.0024 | 21.3 | 11.0 | 0.79 | 0.75 | 0.220 | 0.004 | 0.002 | 0.0022 | |
33 | 0.033 | 0.33 | 0.97 | 0.030 | 0.0015 | 21.6 | 10.5 | 0.55 | 0.82 | 0.217 | 0.004 | 0.002 | 0.0022 | |
34 | 0.020 | 0.50 | 1.36 | 0.032 | 0.0017 | 17.1 | 6.7 | 0.37 | 0.09 | 0.152 | 0.003 | 0.003 | 0.0022 | |
35 | 0.011 | 0.31 | 1.50 | 0.029 | 0.0008 | 17.3 | 6.5 | 0.06 | 0.23 | 0.150 | 0.003 | 0.003 | 0.0022 | |
36 | 0.025 | 0.41 | 1.40 | 0.020 | 0.0024 | 17.4 | 6.8 | 0.00 | 0.13 | 0.147 | 0.003 | 0.003 | 0.0022 | |
37 | 0.026 | 0.40 | 1.43 | 0.010 | 0.0011 | 17.2 | 7.0 | 0.06 | 0.01 | 0.153 | 0.004 | 0.002 | 0.0025 |
구분 | 강종 No. | 식(1) | CrN 석출온도 | 식(2) | 결함 수 | 경도 (Hv) |
발명예 | 1 | 4.5 | 1266 | 1261 | 0.17 | 198 |
2 | 4.2 | 1261 | 1246 | 0.18 | 199 | |
3 | 3.0 | 1202 | 1201 | 0.14 | 208 | |
4 | 2.8 | 1188 | 1202 | 0.12 | 192 | |
5 | 3.6 | 1261 | 1248 | 0.22 | 202 | |
6 | 2.8 | 1257 | 1255 | 0.24 | 199 | |
7 | 2.0 | 1193 | 1187 | 0.02 | 208 | |
8 | 2.0 | 1191 | 1189 | 0 | 201 | |
9 | 2.7 | 1251 | 1250 | 0.13 | 195 | |
10 | 2.5 | 1277 | 1259 | 0.17 | 202 | |
11 | 1.8 | 1260 | 1263 | 0.03 | 199 | |
12 | 1.7 | 1258 | 1260 | 0.12 | 199 | |
13 | 1.8 | 1263 | 1263 | 0.17 | 213 | |
14 | 1.8 | 1261 | 1263 | 0.08 | 198 | |
15 | 1.8 | 1261 | 1265 | 0.07 | 199 | |
16 | 1.0 | 1180 | 1184 | 0.02 | 212 | |
17 | 1.0 | 1201 | 1208 | 0.15 | 211 | |
18 | 1.0 | 1193 | 1198 | 0.03 | 213 | |
19 | 0.9 | 1198 | 1210 | 0.03 | 211 | |
20 | 1.0 | 1197 | 1200 | 0.23 | 198 | |
21 | 1.6 | 1256 | 1258 | 0.05 | 199 | |
22 | 1.5 | 1262 | 1263 | 0.16 | 211 | |
23 | 1.5 | 1256 | 1260 | 0.2 | 202 | |
24 | 1.4 | 1262 | 1263 | 0.25 | 209 | |
25 | 0.7 | 1204 | 1207 | 0.12 | 197 | |
26 | 1.2 | 1262 | 1265 | 0 | 203 | |
27 | 0.6 | 1190 | 1196 | 0 | 211 | |
28 | 0.2 | 1203 | 1210 | 0.12 | 212 | |
29 | -2.1 | 1203 | 1204 | 0.18 | 211 | |
비교예 | 30 | 1.2 | 1193 | 1191 | 0.45 | 198 |
31 | 1.8 | 1262 | 1251 | 0.47 | 195 | |
32 | 1.7 | 1273 | 1262 | 0.83 | 198 | |
33 | 1.5 | 1271 | 1257 | 0.78 | 201 | |
34 | 0.9 | 1203 | 1202 | 0.43 | 194 | |
35 | 0.8 | 1200 | 1194 | 0.78 | 201 | |
36 | 0.1 | 1199 | 1195 | 0.83 | 199 | |
37 | -1.1 | 1198 | 1195 | 0.65 | 211 |
Claims (4)
- 중량%로, C: 0.01 내지 0.035%, Si: 0.5% 이하, Mn: 0.5 내지 1.5%, Cr: 17 내지 22%, Ni: 6 내지 11%, Mo: 1% 이하, Cu: 1% 이하, N: 0.1 내지 0.22%, 나머지 Fe 및 불가피한 불순물을 포함하고,하기 식 (1)의 값이 1.9 이상이거나, 크롬 질화물의 석출온도가 하기 식 (2)로 표현되는 값 이하를 만족하는 열간가공성이 우수한 고강도 오스테나이트계 스테인리스강.(1) 3×(Cr+Mo) + 5×Si - 2×Ni - Mn - 70×(C+N) - 27(2) 1180 + 36×C + 12×Mo + 17×Cu + 411×N - 35×Mn(여기서, Cr, Mo, Si, Ni, Mn, C, N, Cu은 각 원소의 함량(중량%)을 의미한다.)
- 제1항에 있어서,표면 크랙 개수가 단위 미터(m)당 0.3개 이하인 열간가공성이 우수한 고강도 오스테나이트계 스테인리스강.
- 제1항에 있어서,경도가 190 Hv 이상인 열간가공성이 우수한 고강도 오스테나이트계 스테인리스강.
- 제1항에 있어서,중량%로, P: 0.05% 이하, S: 0.01% 이하, Al: 0.1% 이하, Ti: 0.01% 이하, B: 0.005% 이하를 포함하는 열간가공성이 우수한 고강도 오스테나이트계 스테인리스강.
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JPH06212365A (ja) * | 1993-01-20 | 1994-08-02 | Daido Steel Co Ltd | 帯鋸用鋼材およびその製造方法 |
EP1215298A2 (en) * | 2000-12-04 | 2002-06-19 | Nisshin Steel Co., Ltd. | A high-strength austenitic stainless steel strip excellent in flatness of shape and its manufacturing method |
JP2017088928A (ja) * | 2015-11-05 | 2017-05-25 | 新日鐵住金ステンレス株式会社 | 耐熱性と加工性に優れたオーステナイト系ステンレス鋼板とその製造方法、および当該ステンレス鋼製排気部品 |
JP2020509212A (ja) * | 2016-12-23 | 2020-03-26 | ポスコPosco | 加工性および表面特性が優秀なオーステナイト系ステンレス鋼およびその製造方法 |
KR20200054779A (ko) * | 2018-11-12 | 2020-05-20 | 주식회사 포스코 | 비자성 오스테나이트계 스테인리스강 및 그 제조방법 |
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JPH06212365A (ja) * | 1993-01-20 | 1994-08-02 | Daido Steel Co Ltd | 帯鋸用鋼材およびその製造方法 |
EP1215298A2 (en) * | 2000-12-04 | 2002-06-19 | Nisshin Steel Co., Ltd. | A high-strength austenitic stainless steel strip excellent in flatness of shape and its manufacturing method |
JP2017088928A (ja) * | 2015-11-05 | 2017-05-25 | 新日鐵住金ステンレス株式会社 | 耐熱性と加工性に優れたオーステナイト系ステンレス鋼板とその製造方法、および当該ステンレス鋼製排気部品 |
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