WO2011007921A1 - 고강도·고내식 탄질소 복합첨가 오스테나이트계 스테인리스강 및 이의 제조방법 - Google Patents
고강도·고내식 탄질소 복합첨가 오스테나이트계 스테인리스강 및 이의 제조방법 Download PDFInfo
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- WO2011007921A1 WO2011007921A1 PCT/KR2009/004642 KR2009004642W WO2011007921A1 WO 2011007921 A1 WO2011007921 A1 WO 2011007921A1 KR 2009004642 W KR2009004642 W KR 2009004642W WO 2011007921 A1 WO2011007921 A1 WO 2011007921A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0405—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/041—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular fabrication or treatment of ingot or slab
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0426—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
Definitions
- the present invention relates to a high strength, high corrosion resistance carbon nitrogen composite austenitic stainless steel and a method for producing the same.
- austenitic stainless steel is unlikely to improve characteristics due to heat treatment, unlike carbon steel, which has a combination of strength and ductility through phase transformation and processing heat treatment using various processing heat treatment processes. It depends mainly on the addition of alloying elements.
- Nickel (Ni) of the alloy element is an efficient austenite stabilizing element and has the advantage of contributing to the improvement of workability, more than 65% of the total supply and demand is used as an alloy element of austenitic stainless steel.
- Nickel prices are a key indicator of the cost of stainless steel. Problems countering human and environmental friendliness, such as causing allergy and releasing harmful gases during recycling, have been raised.
- the new stainless steel which was recently developed to solve various problems of the conventional stainless steel having high nickel (Ni) content, has the advantages of Fe-Cr-Mn-based alloy known as STS 200-based alloy and nitrogen as an alloying element. There is high nitrogen stainless steel that actively utilizes and improves various characteristics.
- Nitrogen is a strong austenite stabilizing element, has a number of advantages such as high solid solution strengthening effect, less ductility decrease with strength increase, and corrosion resistance including formal resistance.
- high nitrogen steel has not been actively progressed due to difficulties in manufacturing process to secure nitrogen in steel material.
- PESR pressurized electroslag remelting
- powder metallurgy powder metallurgy
- solid phase nitriding etc. Thanks to the development of various manufacturing process technologies, many research and developments are underway.
- the pressurization process has the advantage of minimizing the delta ferrite section, which secures a high nitrogen content in the liquid state and at the same time rapidly reduces the nitrogen utilization during solidification.
- the present inventors compositely add the invasive element carbon and nitrogen, and control the content of the invasive element (C + N, C / N) and the substituted element (Mn + Cr, Mn / Cr, or 0.5W + Mo).
- C + N, C / N the content of the invasive element
- Mn + Cr, Mn / Cr, or 0.5W + Mo the content of the invasive element
- Mn + Cr, Mn / Cr, or 0.5W + Mo 0.5W + Mo
- An object of the present invention is to solve the above problems, and to control the content of the invasive element (C + N, C / N) and the substituted element (Mn + Cr, Mn / Cr, or 0.5W + Mo) It is an object of the present invention to provide austenitic stainless steel having high strength and high corrosion resistance in which carbon (C) and nitrogen (N) having improved corrosion resistance are added.
- Another object of the present invention is to provide a method for producing the austenitic stainless steel.
- the present invention minimizes the nickel (Ni) content, which is an expensive alloy element harmful to the environment and human body by adding carbon (C) and nitrogen (N), which is an invasive element, and excludes the pressure melting method. It can be manufactured by the atmospheric pressure melting method to provide an austenitic stainless steel excellent in economic efficiency and a method of manufacturing the same.
- the manufacturing method according to the present invention enables the production of alloys at low manufacturing costs, thereby improving the price competitiveness of developed steel grades.
- the austenitic stainless steel produced according to the present invention is controlled by controlling the content of the invasive element (C + N, C / N) and the substituted element (Mn + Cr, Mn / Cr, or 0.5W + Mo) It has a tensile strength of 850 MPa or more and a uniform elongation of 45% or more, which not only improves molding processability, but also exhibits excellent corrosion resistance and biocompatibility by minimizing the content of nickel (Ni), an alloy element harmful to the human body.
- Ni nickel
- Figure 1 is a graph showing the change in nitrogen utilization with temperature changes in Fe-Cr-Mn-based Fe-Cr-Mn-0.4C alloy system according to an embodiment of the present invention.
- FIG. 2 is a manufacturing process chart showing a method for producing austenitic stainless steel having high strength and high corrosion resistance in which carbon (C) and nitrogen (N) are added in combination with the present invention.
- FIG. 3 is a manufacturing process diagram showing in detail a nitrogen content adjusting step which is one step in the manufacturing method of a high-strength and high corrosion resistance austenitic stainless steel in which carbon (C) and nitrogen (N) are added in accordance with the present invention.
- the austenitic stainless steel having high strength and high corrosion resistance in which carbon (C) and nitrogen (N) are added in combination with the present invention is 8 to 12% by weight of manganese (Mn) and 15 to 20% by weight of chromium ( Cr), 2 wt% or less nickel (Ni), 4 wt% or less tungsten (W), 2 wt% or less molybdenum, 0.6-1.0 wt% carbon (C) and nitrogen (N) It is characterized by including the total content (C + N), the remaining iron (Fe) and other unavoidable impurities.
- the ratio (Mn / Cr) of manganese (Mn) to chromium (Cr) is characterized by being 0.5 or more and 1.0 or less.
- the manganese is lower than the content of manganese (16 to 21% by weight) contained in the conventional stainless steel (PCT / EP / 008960) released by Berns Group can improve the official resistance of the stainless steel according to the present invention.
- the total content (Mn + Cr) of the manganese (Mn) and chromium (Cr) is characterized in that less than 30% by weight.
- the content of nitrogen (N) is characterized in that more than 0.3% by weight.
- the total content of the tungsten (W) and molybdenum (Mo) is characterized in that 0.5W + Mo is 3% by weight or less. If the total content of 0.5W + Mo exceeds 3% by weight, the manufacturing cost increases, there is a problem of increasing the residual delta ferrite fraction and forming a harmful second phase.
- Nickel (Ni) has a high austenite stabilizing ability, but as described above, it is expensive and harmful to the environment and human body, so the amount of addition is limited as much as possible. However, when a small amount of nickel (Ni) is added to the austenitic stainless steel, it has the ability to improve hot and cold workability and to suppress delta ferrite formation during solidification from the liquid phase. Set to.
- Chromium (Cr) is an essential alloy element for securing the corrosion resistance required for stainless steel, and most of the chromium (Cr) is added to more than 15% by weight in austenitic stainless steel. However, when chromium (Cr) is added in excess, excessive delta ferrite remains after solidification, or promotes the generation of various harmful second precipitated phases during heat treatment, thereby deteriorating corrosion resistance and workability of stainless steel. Therefore, in the stainless steel, the content of chromium (Cr) was limited to the range of 15 to 20% by weight.
- Manganese (Mn) is an austenite stabilizing element that can replace expensive nickel (Ni), and is added to stainless steel to increase nitrogen utilization and increase the strength of materials.
- nonmetallic inclusions such as manganese sulfide (MnS) and manganese oxide (MnO) are formed by combining with sulfur (S) or oxygen (O), which are impurity elements.
- S sulfur
- O oxygen
- the non-metallic inclusions acted as the main official source for lowering the formal resistance of the austenitic stainless steel, so the content was limited to 8 to 12% by weight.
- Molybdenum (Mo) is an alloy element that improves the corrosion resistance of austenitic stainless steel together with chromium (Cr). However, when excessively added, the delta ferrite fraction remaining after solidification increases, and like chromium (Cr), it forms a harmful second phase such as carbides and intermetallic compounds and increases the manufacturing cost. Limited.
- Tungsten (W) as an alloying element increases the high temperature strength of stainless steel and improves creep resistance. In addition, there is an effect to increase the general corrosion resistance in the non-oxidizing atmosphere, promote the passivation of the metal, and improve the official resistance of the alloy.
- tungsten is also a ferrite stabilizing element, when added excessively, the delta ferrite fraction is increased, and as a result of the increase in manufacturing cost, the content is limited to 4 wt% or less.
- the 0.5W + Mo content was limited to 3% by weight or less in order to secure excellent corrosion resistance and economical manufacturing cost.
- Carbon (C), like nitrogen (N) is added for the purpose of stabilizing austenite, and serves to improve the strength of stainless steel through a solid solution strengthening effect.
- carbon (C) is excessively added, mechanical properties (typically toughness) are degraded, and carbides such as M 23 C 6 and M 6 C are formed at grain boundaries to promote sensitization of austenitic stainless steels. This lowers the corrosion resistance.
- the stainless steel of the present invention was limited to the total content (C + N) of carbon (C) and nitrogen (N) in the range of 0.6 to 1.0% by weight.
- Figure 1 is 0.4 weight of three kinds of Fe-Cr-Mn-based (Fe-18Cr-10Mn, Fe-15Cr-15Mn, Fe-13Cr-20Mn) alloy without carbon (C) and carbon (C) It is the result of calculating the nitrogen solubility at 1 atmosphere of nitrogen partial pressure of three kinds of Fe-Cr-Mn-0.4C alloys added. As shown in the figure, the nitrogen utilization of the liquid phase decreases from 0.38 wt% to 0.3 wt% with the addition of carbon (C), but when solidification, the decrease in nitrogen employment due to delta ferrite formation is significantly reduced. It is possible to reduce the nitrogen loss that can occur.
- the reason for limiting the total content (C + N) of carbon (C) and nitrogen (N) in the range of 0.6 to 1.0% by weight is as follows.
- nitrogen (N) is added as an alloying element to increase the free electron density of the austenite matrix, which promotes metallic bonding to short-range rule diagrams within the austenitic matrix. -range ordering). Due to the specificity of the atomic bonds generated during nitrogen addition, it is possible to suppress the formation of harmful second phase due to segregation of alloying elements and to improve ductility and corrosion resistance. That is, the physical basis for the addition of nitrogen (N) to improve the overall characteristics of the steel can be said to be due to the increase in free electron concentration.
- the production method of austenitic stainless steel having high strength and high corrosion resistance in which carbon (C) and nitrogen (N) are added in combination is electrolytic iron, Fe-50% Mn, Fe-60% Cr, Fe- A mother alloy charging step of charging a master alloy containing 58.8% Cr-6.6% N, 75.1% Mn-17.4% Fe-6.8% C, tungsten and / or molybdenum into a vacuum melting furnace, and a vacuum melting furnace loaded with the mother alloy A vacuum holding step of maintaining the vacuum state, a mother alloy melting step of melting the master alloy by heating the vacuum melting furnace, a nitrogen content adjusting step of injecting nitrogen gas into the vacuum melting furnace, and stirring the molten master alloy
- the vacuum holding step is characterized in that the inside of the vacuum melting process to have a vacuum degree of less than 10 -3 torr.
- the nitrogen content adjusting step includes a nitrogen injection process of injecting nitrogen gas into the vacuum melting furnace and a pressure adjustment process of adjusting the nitrogen partial pressure inside the vacuum melting furnace to 1 atm.
- the austenitic stainless steel according to the present invention was found to have a tensile strength of 850 MPa or more and a uniform elongation of 45% or more (see Table 2).
- a tensile strength of 850 MPa or more and a uniform elongation of 45% or more (see Table 2).
- dV / dt potential scanning speed
- the austenitic stainless steel according to the present invention can be manufactured by using atmospheric pressure induction melting without the pressurization process, which is inevitable for the production of conventional high nitrogen steel by complex addition of carbon (C), the production of alloys at a low production cost
- C complex addition of carbon
- the content of invasive elements (C + N, C / N) and substituted elements (Mn + Cr, Mn / Cr, or 0.5W + Mo) is controlled by 850. It has a tensile strength of at least MPa and a uniform elongation of at least 45%, which not only improves molding processability but also shows excellent corrosion resistance and improves biocompatibility by minimizing the content of nickel (Ni), which is a harmful alloying element.
- chromium which has a high melting point and is difficult to dissolve, uses a Fe-60% Cr master alloy, and has a low vapor pressure, resulting in fume formation and segregation during melting.
- Mn was used a Fe-50% Mn master alloy.
- Austenitic stainless steels were manufactured by a method prepared by the patent (PCT / EP / 008960) published by the Bernes Group.
- Table 1 shows the compositions of the austenitic stainless steels of Examples and Comparative Examples.
- Example 1 18.10 9.47 - 2.17 - 0.38 0.48 0.86
- Example 2 17.85 9.72 1.25 2.05 - 0.42 0.49 0.91
- Example 3 17.98 9.79 - - 2.01 0.39 0.48 0.87
- Example 4 17.71 9.85 1.21 - 2.00 0.36 0.55 0.91
- Example 5 18.12 9.63 0.10 1.16 2.00 0.38 0.53 0.91
- Example 6 17.73 9.97 1.23 1.15 1.99 0.39 0.52 0.91
- Example 7 17.68 9.84 - - 3.80 0.41 0.56 0.97
- Example 8 17.65 9.73 1.17 - 3.77 0.43 0.54 0.97
- Comparative Example 1 18.00 2.00 8.00 - - - 0.08 0.08 Comparative Example 2 17.00 2.00 12.00 2.50 - - 0.08 0.08 Comparative Example 3 17.00 2.00 12.00 2.50 - - 0.03 0.03 Comparative Example 4 18.54 17.86 0.45 0.52 - 0.54 0.66 1.20 Comparative Example 5 17.97 17.8 0.36 0.51 -
- Table 2 shows room temperature tensile properties of the examples and the comparative examples prepared by the above process.
- Comparative Examples 1 to 3 which are commercial austenitic stainless steels, exhibited mechanical properties such as yield strength of 170 to 205 MPa, tensile strength of 480 to 515 MPa, and elongation of 40%. In the case of yield strength 476 ⁇ 559 MPa, tensile strength 868 ⁇ 980 MPa, uniform elongation was 46.3 ⁇ 62.1%.
- the austenitic stainless steel according to the present invention can be used to replace the conventional austenitic stainless steel by exhibiting excellent mechanical properties of high strength while minimizing the content of nickel than commercially available austenitic stainless steel.
- the specimens of the austenitic stainless steels of Examples and Comparative Examples were placed in a 1 M NaCl solution at room temperature, and the potential was increased at a potential scanning speed (dV / dt) of 2 mV / s.
- the polarization polarization behavior was measured and the formula potential was calculated and shown in FIG. 4 and Table 3.
- Example 1 no pitting (1.0 or later)
- Example 2 no pitting (1.0 or later)
- Example 3 no pitting (1.0 or later)
- Example 4 no pitting (1.0 or later)
- Example 5 no pitting (1.0 or later)
- Example 6 no pitting (1.0 or later)
- Example 7 no pitting (1.0 or later)
- Example 8 no pitting (1.0 or later) Comparative Example 1 0.311 Comparative Example 2 0.417 Comparative Example 3 0.496 Comparative Example 4 0.557 Comparative Example 5 0.692
- Examples 1-8 of this invention did not generate a formula.
- the formulas of commercial stainless steels used in Comparative Examples 1 to 3 were generated at 0.311 to 0.496 V SCE
- the formulas of the conventional carbonitride-added stainless steels of Comparative Examples 4 and 5 were generated at 0.557 V SCE and 0.692 V SCE , respectively. . From this, it can be seen that the formal resistance of the austenitic stainless steel according to the present invention is superior to that of the comparative example.
- the austenitic stainless steel according to the present invention exhibits excellent mechanical properties with high corrosion resistance while minimizing nickel content than commercially available austenitic stainless steel or conventional carbon-nitrogen mixed austenitic stainless steel. Can be used in place of steel.
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Abstract
Description
합금 | Cr | Mn | Ni | Mo | W | N | C | C+N |
실시예 1 | 18.10 | 9.47 | - | 2.17 | - | 0.38 | 0.48 | 0.86 |
실시예 2 | 17.85 | 9.72 | 1.25 | 2.05 | - | 0.42 | 0.49 | 0.91 |
실시예 3 | 17.98 | 9.79 | - | - | 2.01 | 0.39 | 0.48 | 0.87 |
실시예 4 | 17.71 | 9.85 | 1.21 | - | 2.00 | 0.36 | 0.55 | 0.91 |
실시예 5 | 18.12 | 9.63 | 0.10 | 1.16 | 2.00 | 0.38 | 0.53 | 0.91 |
실시예 6 | 17.73 | 9.97 | 1.23 | 1.15 | 1.99 | 0.39 | 0.52 | 0.91 |
실시예 7 | 17.68 | 9.84 | - | - | 3.80 | 0.41 | 0.56 | 0.97 |
실시예 8 | 17.65 | 9.73 | 1.17 | - | 3.77 | 0.43 | 0.54 | 0.97 |
비교예 1 | 18.00 | 2.00 | 8.00 | - | - | - | 0.08 | 0.08 |
비교예 2 | 17.00 | 2.00 | 12.00 | 2.50 | - | - | 0.08 | 0.08 |
비교예 3 | 17.00 | 2.00 | 12.00 | 2.50 | - | - | 0.03 | 0.03 |
비교예 4 | 18.54 | 17.86 | 0.45 | 0.52 | - | 0.54 | 0.66 | 1.20 |
비교예 5 | 17.97 | 17.8 | 0.36 | 0.51 | - | 0.58 | 0.48 | 1.06 |
합금 | 항복강도(MPa) | 인장강도(MPa) | 균일연신율(%) |
실시예 1 | 529 | 980 | 62.1 |
실시예 2 | 559 | 973 | 46.3 |
실시예 3 | 537 | 960 | 52.3 |
실시예 4 | 493 | 903 | 59.3 |
실시에 5 | 523 | 899 | 51.1 |
실시예 6 | 528 | 927 | 49.4 |
실시예 7 | 476 | 868 | 55.7 |
실시예 8 | 532 | 930 | 50.8 |
비교예 1 | 205 | 515 | 40.0(총연신율) |
비교예 2 | 205 | 515 | 40.0(총연신율) |
비교예 3 | 170 | 480 | 40.0(총연신율) |
비교예 4 | 533 | 1019 | 62.8 |
비교예 5 | 500 | 940 | 59.0 |
합금 | 공식전위(Epit), VSCE |
실시예 1 | no pitting(1.0 이상) |
실시예 2 | no pitting(1.0 이상) |
실시예 3 | no pitting(1.0 이상) |
실시예 4 | no pitting(1.0 이상) |
실시예 5 | no pitting(1.0 이상) |
실시예 6 | no pitting(1.0 이상) |
실시예 7 | no pitting(1.0 이상) |
실시예 8 | no pitting(1.0 이상) |
비교예 1 | 0.311 |
비교예 2 | 0.417 |
비교예 3 | 0.496 |
비교예 4 | 0.557 |
비교예 5 | 0.692 |
Claims (12)
- 8~12 중량%의 망간(Mn)과; 15~20 중량%의 크롬(Cr)과; 2 중량% 이하의 니켈(Ni)과; 0.6~1.0 중량%의 탄소(C)와 질소(N)의 총 함량(C+N)과; 4 중량% 이하의 텅스텐(W)과; 2 중량% 이하의 몰리브덴(Mo)과; 잔부(殘部)인 철(Fe) 및 기타 불가피한 불순물을 포함하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강.
- 제1항에 있어서, 상기 오스테나이트계 스테인리스강은 8~12 중량%의 망간(Mn)과; 15~20 중량%의 크롬(Cr)과; 2 중량% 이하의 니켈(Ni)과; 1~4 중량%의 텅스텐(W)과; 0.6~1.0 중량%의 탄소(C)와 질소(N)의 총 함량(C+N)과; 잔부(殘部)인 철(Fe) 및 기타 불가피한 불순물을 포함하는 것을 특징으로 하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강.
- 제1항에 있어서, 상기 오스테나이트계 스테인리스강은 8~12 중량%의 망간(Mn)과; 15~20 중량%의 크롬(Cr)과; 2 중량% 이하의 니켈(Ni)과; 2 중량% 이하의 몰리브덴(Mo)과; 0.6~1.0 중량%의 탄소(C)와 질소(N)의 총 함량(C+N)과; 잔부(殘部)인 철(Fe) 및 기타 불가피한 불순물을 포함하는 것을 특징으로 하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강.
- 제1항에 있어서, 상기 오스테나이트계 스테인리스강은 8~12 중량%의 망간(Mn)과; 15~20 중량%의 크롬(Cr)과; 2 중량% 이하의 니켈(Ni)과; 1~4 중량%의 텅스텐(W)과; 2 중량% 이하의 몰리브덴(Mo)과; 0.6~1.0 중량%의 탄소(C)와 질소(N)의 총 함량(C+N)과; 잔부(殘部)인 철(Fe) 및 기타 불가피한 불순물을 포함하는 것을 특징으로 하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강.
- 제1항에 있어서, 상기 크롬(Cr)에 대한 망간(Mn)의 비율(Mn/Cr)은 0.5 이상 1.0 이하인 것을 특징으로 하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강.
- 제1항에 있어서, 상기 망간(Mn)과 크롬(Cr)의 총함량(Mn+Cr)은 30 중량% 이하인 것을 특징으로 하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강.
- 제1항에 있어서, 상기 질소(N)의 함량은 0.3 중량% 이상인 것을 특징으로 하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강.
- 제1항에 있어서, 상기 텅스텐(W)과 몰리브덴(Mo)의 총함량은 0.5W+Mo이 3 중량% 이하인 것을 특징으로 하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강.
- 제1항에 있어서, 상기 오스테나이트계 스테인리스강은 인장강도 850 MPa 이상, 균일 연신율 45% 이상의 기계적 특성을 갖는 것을 특징으로 하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강.
- 모합금을 진공용해로에 장입하는 모합금장입단계와,상기 모합금이 장입된 진공용해로를 진공 상태로 유지하는 진공유지단계와,상기 진공용해로를 가열하여 모합금을 용융하는 모합금용융단계와,상기 진공용해로 내부에 질소가스를 주입하는 질소함량조정단계와,용융된 모합금을 교반하는 용융합금교반단계와,상기 진공용해로 내부에서 교반된 용융합금을 출탕하여 주괴를 형성하는 주괴형성단계와,형성된 주괴를 열간 압연하는 단계와,열간 압연된 스테인리스강을 수냉 처리하여 기계적 특성, 내식성에 유해한 탄화물의 석출을 억제하는 단계를 포함하여 이루어지는 것을 특징으로 하는 제1항의 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강의 제조방법.
- 제10항에 있어서, 상기 진공유지단계는 진공용해로 내부가 10-3torr 이하의 진공도를 갖도록 하는 과정임을 특징으로 하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강의 제조방법.
- 제10항에 있어서, 상기 질소함량조정단계는,상기 진공용해로 내부로 질소 가스를 주입하는 질소주입과정과,상기 진공용해로 내부의 질소분압을 1기압으로 조정하는 압력조정과정으로 이루어지는 것을 특징으로 하는 탄소(C)와 질소(N)가 복합첨가된 고강도·고내식성을 갖는 오스테나이트계 스테인리스강의 제조방법.
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US12/994,815 US20110226391A1 (en) | 2009-07-13 | 2009-08-20 | C+n austenitic stainless steel having high strength and excellent corrosion resistance, and fabrication method thereof |
CN200980159318.1A CN102428200B (zh) | 2009-07-13 | 2009-08-20 | 含有碳-氮复合添加剂的高强度/抗腐蚀性奥氏体不锈钢及其制造方法 |
JP2011522918A JP5272078B2 (ja) | 2009-07-13 | 2009-08-20 | 高強度・高耐食の炭窒素複合添加オーステナイト系ステンレス鋼及びその製造方法 |
EP09847378.8A EP2455508B1 (en) | 2009-07-13 | 2009-08-20 | High strength / corrosion-resistant,.austenitic stainless steel with carbon - nitrogen complex additive, and method for manufacturing same |
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KR1020090063486A KR101089718B1 (ko) | 2009-07-13 | 2009-07-13 | 텅스텐 및 몰리브덴이 첨가된 고강도·고내식 탄질소 복합첨가 오스테나이트계 스테인리스강 및 이의 제조방법 |
KR1020090063487A KR101089714B1 (ko) | 2009-07-13 | 2009-07-13 | 텅스텐이 첨가된 고강도·고내식 탄질소 복합첨가 오스테나이트계 스테인리스강 및 이의 제조방법 |
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EP (1) | EP2455508B1 (ko) |
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EP2924514A1 (fr) * | 2014-03-24 | 2015-09-30 | Nivarox-FAR S.A. | Ressort d'horlogerie en acier inoxydable austénitique |
CN113737091A (zh) * | 2021-07-22 | 2021-12-03 | 洛阳双瑞特种装备有限公司 | 一种低磁高强度耐蚀紧固件用钢以及紧固件 |
CN114606430A (zh) * | 2022-03-01 | 2022-06-10 | 兴机电器有限公司 | 一种低碳Fe-Mn-Al-Si系TWIP钢及其制备方法 |
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Also Published As
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US20110226391A1 (en) | 2011-09-22 |
JP2011526969A (ja) | 2011-10-20 |
CN102428200B (zh) | 2014-04-02 |
EP2455508B1 (en) | 2016-11-23 |
EP2455508A4 (en) | 2014-03-05 |
EP2455508A1 (en) | 2012-05-23 |
CN102428200A (zh) | 2012-04-25 |
JP5272078B2 (ja) | 2013-08-28 |
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