WO2019039715A1 - Acier inoxydable austénitique ayant une excellente aptitude au façonnage et une excellente résistance aux fissures anti-vieillissement et produit d'étirage l'utilisant - Google Patents

Acier inoxydable austénitique ayant une excellente aptitude au façonnage et une excellente résistance aux fissures anti-vieillissement et produit d'étirage l'utilisant Download PDF

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WO2019039715A1
WO2019039715A1 PCT/KR2018/006853 KR2018006853W WO2019039715A1 WO 2019039715 A1 WO2019039715 A1 WO 2019039715A1 KR 2018006853 W KR2018006853 W KR 2018006853W WO 2019039715 A1 WO2019039715 A1 WO 2019039715A1
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stainless steel
austenitic stainless
aging
workability
steel
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PCT/KR2018/006853
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English (en)
Korean (ko)
Inventor
김상석
박미남
정한용
민현웅
김영민
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주식회사 포스코
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Priority to JP2020511263A priority Critical patent/JP7256792B2/ja
Priority to CN201880068255.8A priority patent/CN111247265B/zh
Publication of WO2019039715A1 publication Critical patent/WO2019039715A1/fr

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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
    • C22C38/04—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
    • C22C38/18—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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • 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 an austenitic stainless steel which is excellent in workability and anti-aging crack resistance without causing defects such as age cracking or delayed fracture even when applied to a design sink having a radius of curvature of 50 mm or less.
  • Stainless steel is generally used for sink bowls in kitchen sinks. 300 series universal stainless steels are mainly used, but the general shape of the sink bowl is not widely used because of the problem of moldability.
  • Fig. 1 shows a deformation amount distribution during molding of a design sink model in which the curvature radius R of the corner corner is 20 mm. As shown in Fig. 1, the deformation amount concentrates on the edge leading from the flange portion to the bottom during drawing, and a crack is generated in the concentrated deformation portion.
  • the embodiments of the present invention provide an austenitic stainless steel excellent in workability and anti-aging crack resistance without occurrence of defects such as age cracking or delayed fracture even when applied to a design sink having a radius of curvature of 50 mm or less I want to.
  • the austenitic stainless steel according to one embodiment of the present invention is excellent in workability and anti-aging crack resistance, and contains 0.01 to 0.04% of C, 0.1 to 1% of Si, 0.1 to 2% of Mn, 0.1 to 2% of Mn, (1), wherein the alloy contains 6 to 10% of Cr, 16 to 20% of Cr, 1 to 2% of Cu, 0.01 to 0.2% of Mo, 0.035 to 0.07% of N and the balance of Fe and unavoidable impurities
  • the austenite stabilization parameter (ASP) value is not more than -3 and the work hardening index n value satisfies the range of 0.4 to 0.5 in the true strain range of 0.3 to 0.4.
  • C, N, Si, Mn, Ni, Cr, and Cu mean the content (weight%) of each element.
  • the stainless steel may satisfy the following formula (2).
  • Cu and N mean the content (weight%) of each element.
  • the stainless steel may have a yield strength (YS) of 230 MPa or more and a tensile strength (TS) of 540 MPa or more.
  • the stainless steel may satisfy the following formula (3).
  • N, Mn, and Cu mean the content (weight%) of each element.
  • the stainless steel may have an average potential of 245 mV or higher.
  • the austenitic stainless steel drawing finished product excellent in workability and anti-aging cracking property according to an embodiment of the present invention is characterized in that when the stainless steel is drawn using a punch,
  • the amounts of modified organic martensite measured at the side wall positions of 20 mm, 30 mm and 40 mm satisfy 1.0%, 1.0%, 5.0%, 10% and 15%, respectively.
  • aged cracks may not occur in the drawn product after 24 hours of processing.
  • the austenitic stainless steel excellent in workability and anti-aging resistance according to the embodiment of the present invention can prevent defects such as aging cracks or delayed fracture even when applied to a design sink having a radius of curvature of 50 mm or less have.
  • the material has a yield strength of 230 MPa or more and a tensile strength of 540 MPa or more to satisfy the material specifications and exhibits an average electric potential of 245 mV or more, which is excellent in corrosion resistance.
  • Fig. 1 shows a deformation amount distribution during molding of a design sink model having a curvature radius of corner corner of 20 mm.
  • FIG. 2 is a graph showing the relationship between true strain-work hardening indexes of austenitic stainless steels and comparative steels according to an embodiment of the present invention.
  • FIG 3 is a cross-sectional view schematically showing a cup drawing process using a punch.
  • Fig. 4 shows the position where the amount of modified organic martensite of the workpiece after the cup drawing process was measured.
  • the austenitic stainless steel according to one embodiment of the present invention is excellent in workability and anti-aging crack resistance, and contains 0.01 to 0.04% of C, 0.1 to 1% of Si, 0.1 to 2% of Mn, 0.1 to 2% of Mn, (1), wherein the alloy contains 6 to 10% of Cr, 16 to 20% of Cr, 1 to 2% of Cu, 0.01 to 0.2% of Mo, 0.035 to 0.07% of N and the balance of Fe and unavoidable impurities
  • the austenite stabilization parameter (ASP) value is not more than -3 and the work hardening index n value satisfies the range of 0.4 to 0.5 in the true strain range of 0.3 to 0.4.
  • C, N, Si, Mn, Ni, Cr, and Cu mean the content (weight%) of each element.
  • the inventors of the present invention have studied the processing conditions capable of forming austenitic stainless steel sheet without designing cracks. However, the inventors of the present invention have been able to develop a new austenitic stainless steel because the cracking can not be suppressed merely by controlling the processing conditions.
  • the STS304 steel has excellent deep drawability, but cracks often occur during machining of complex shapes or design sinking. From this point, it has been found that it is important to control not only the deep drawability but also the work hardening index in the case of a design sink product which is complicated in shape by press molding or whose radius of curvature R is controlled to be 50 mm or less.
  • the work hardening index and the anti-aging cracking property can be ensured by controlling the work hardening index according to the Austenite Stability Parameter (hereinafter referred to as " ASP ") value together with the composition of the component system.
  • &quot Austenite Stability Parameter
  • the austenitic stainless steel according to one embodiment of the present invention is excellent in workability and anti-aging crack resistance, and contains 0.01 to 0.04% of C, 0.1 to 1% of Si, 0.1 to 2% of Mn, 0.1 to 2% of Mn, 6 to 10%, Cr: 16 to 20%, Cu: 1 to 2%, Mo: 0.01 to 0.2%, N: 0.035 to 0.07%, balance Fe and unavoidable impurities.
  • the content of carbon (C) is 0.01 to 0.04%.
  • the content of silicon (Si) is 0.1 to 1.0%.
  • Silicon in steel is added as a deoxidizer in the steelmaking process.
  • Si-oxide is formed in the passive film when the film is subjected to a bright annealing process, thereby improving the corrosion resistance of the steel.
  • the content is 1.0% or more, there is a problem that the ductility of the steel is lowered.
  • the content of manganese (Mn) is 0.1 to 2.0%.
  • Ni nickel
  • the content of nickel (Ni) is 6.0 to 10.0%.
  • the content of chromium (Cr) is 16.0 to 20.0%.
  • Chromium in steel is an essential element for improvement of corrosion resistance. It is necessary to add more than 16% in order to secure corrosion resistance in atmospheric environment and sink applications. However, when added excessively, chromium is hardened and moldability such as deep drawability is disadvantageous , So it is limited to 20%.
  • the content of copper (Cu) is 1.0 to 2.0%.
  • Copper in steel is an austenite phase stabilizing element, and as the amount of copper is increased, the austenite phase is stabilized and the effect of suppressing work hardening due to the generation of modified organic martensite is suppressed.
  • corrosion resistance is lowered and cost is increased.
  • the content of molybdenum (Mo) is 0.01 to 0.2%.
  • Molybdenum in the steel has an effect of improving the corrosion resistance and workability and is added by 0.01% or more, and excessive addition is limited to 0.2% or less because it involves an increase in cost.
  • the content of nitrogen (N) is 0.035 to 0.07%.
  • austenite stabilization parameter (ASP) value represented by the following formula (1) satisfies -3 or below together with the composition of the component system.
  • FIG. 2 is a graph showing the relationship between true strain-work hardening indexes of austenitic stainless steels and comparative steels according to an embodiment of the present invention.
  • most of the 300-grade austenitic stainless steels have a work hardening index (n) in the range of 0.3 to 0.4 at a strain rate of 10 to 20% at the early stage of deformation.
  • n work hardening index
  • a work hardening index in the range of 0.55 to 0.65 at an elongation strain of 30 to 40%.
  • R radius of curvature
  • the austenitic stainless steel according to one embodiment of the present invention satisfies the Austenite Stabilization Parameter (ASP) value of -3 or less, and the work hardening index n value in the range of true strain 0.3 to 0.4 can exhibit a range of 0.4 to 0.5 have.
  • ASP Austenite Stabilization Parameter
  • the excellent formability of the material is also important, but it is sometimes necessary to guarantee the material specification for each country.
  • the strength of the material of the 304 material standard can not be guaranteed, and in the present invention, excellent material strength and corrosion resistance, And to develop a steel which can secure corrosion resistance.
  • the austenitic stainless steel according to one embodiment of the present invention can satisfy the following formula (2).
  • the austenitic stainless steel according to the present invention can have a yield strength (YS) of 230 MPa or more and a tensile strength (TS) of 540 MPa or more.
  • the austenitic stainless steel according to one embodiment of the present invention can satisfy the following formula (3).
  • the austenitic stainless steel according to the present invention can secure a formal potential of 245 mV or more.
  • FIG 3 is a cross-sectional view schematically showing a cup drawing process using a punch.
  • the deep drawing raises a circular blank on the drawing die 2 and then presses the circular blank with the blank holder 3 at an appropriate pressure. Subsequently, the punch 1 draws the circular blank into the die 2, at which time the center of the workpiece is slowly drawn and the outer periphery of the workpiece slides on the side of the die and into the die 2.
  • the thickness of the bottom portion 10 of the blank surrounding the bottom surface of the punch 1 is accompanied by a reduction in thickness, and the stress state in this portion is a biaxial tensile state.
  • the flange portion 30 since the material is drawn toward the entrance of the die 2 in the radial direction, compressive deformation occurs in the circumferential direction and tensile deformation occurs in the radial direction. Due to the peripheral action of the compression deformation and the tensile deformation, an increase in thickness occurs in the flange portion 30. That is, in the flange portion 30, the thickness of the material becomes thick, and at the same time, the strength of the material increases due to work hardening due to compressive deformation.
  • the thickness of the workpiece becomes thinner and the workpiece hardens due to work hardening.
  • the work hardening of the flange portion 30 Is very low.
  • the flange portion 30 and the side wall portion 20 of the blank having the same fracture limit have a difference in fracture limit.
  • the flange portion 30 has a fracture limit of [high strength x thick thickness]
  • the sidewall portion 20 has a fracture limit of [somewhat high strength x thin thickness], so that the fracture limit becomes uneven, Deformation concentrates on the part where the strength is weak and cracks occur.
  • the austenitic stainless steel drawing finished product excellent in workability and anti-age cracking property according to an embodiment of the present invention was drawn using a punch to a range of 2.0 to 2.3 in the range of the minimum draw ratio (LDR) ,
  • LDR minimum draw ratio
  • the amount of modified organic martensite measured at side wall positions of 10 mm, 20 mm, 30 mm, and 40 mm from the bottom and bottom surfaces of the drawn product satisfies 1.0%, 1.0%, 5.0%, 10%, and 15% .
  • the limited drawing ratio refers to the ratio (D / d) of the maximum diameter (D) of the workpiece to the diameter (d) of the punch.
  • austenite stabilization parameter (ASP) value exceeds -3, aging cracks may occur after 24 hours of processing because the ⁇ ⁇ ⁇ 'transformation can not be suppressed during the drawing process. Therefore, in the case of drawing using the stainless steel having the austenite stabilization parameter (ASP) value of -3 or less according to the present invention, the amount of the modified organic martensite of the drawn product can be controlled, and aging cracks can be prevented .
  • the austenitic stainless steels of the component system shown in Table 1 below are partly manufactured by Lab. Ingot was produced by vacuum melting, and some slabs were produced through an electric furnace-VOD-playing process. The prepared ingot and slab were reheated at 1,240 ° C. for 1 to 2 hours and then heat-treated by a roughing mill and a continuous finishing mill. Hot rolled annealing was performed at a temperature of 1,000 to 1,100 ° C., followed by cold rolling and cold annealing .
  • Inventive steels 1 to 5 controlled the value of Cu / (100 * N) to 0.55 or less and controlled the ASP value to -3 or less to secure the desired yield strength (230 MPa or more) and tensile strength (540 MPa or more) ,
  • the work hardening index n value in the range of the true strain 0.3 to 0.4 suitable for the design sink was 0.5 or less.
  • the comparative steels 1 to 3 had the desired yield strength and tensile strength of the present invention at the values of Cu / (100 * N) of 0.13, 0.03 and 0.20, respectively.
  • ASP values were 18.1, 5.6,
  • the value of the work hardening index n is 0.5 or more in the range of the true strain 0.3 to 0.4, which is not suitable for the design sink application.
  • the comparative steels 4 and 5 had an ASP value of -10.9 and -11.1, respectively, falling within the object range of the present invention, but the Cu / (100 * N) values were 2.90 and 0.73, respectively, And the tensile strength was not ensured.
  • Table 3 shows the correlation between the value of 100 * N - (Mn + Cu) of formula (3) and the formula potential.
  • the average electric potential was measured using a 3.5% NaCl solution at 30 ° C after polishing the surface of the steel sheet # 600.
  • Invention steels 1 to 5 showed that the values of 100 * N - (Mn + Cu) were all 0 or more, and the formula potential indicating the corrosion resistance of the material was more than 245 mV which is a target range of the present invention.
  • the ASP values are -10.9 and -11.1 (see Table 2)
  • the corrosion resistance (over 245 mV) of the STS304 level required by the design sink is lower than 200 mV due to the fact that the N - (Mn + Cu) values do not satisfy the formula (3) could not be secured.
  • Austenitic stainless steel according to an embodiment of the present invention was cup-drawn using a punch having a diameter of 50 mm at a punch speed of 100 mm / min. Drawing processing was performed within a range of 1.9 to 2.3 in the range of the minimum drawing ratio (LDR) and within a range in which creases and fractures did not occur in the upper part of the cup. After drawing, the amount of deformation organic martensite ( ⁇ ') was measured at the side wall positions of 10 mm, 20 mm, 30 mm, and 40 mm from the bottom and bottom surfaces of the cup product as shown in FIG. 4, And whether aged cracks occurred after 24 hours of processing. The amount of modified organic martensite was measured using a ferrite-scope.
  • the austenitic stainless steels according to the embodiments of the present invention have excellent workability and corrosion resistance cracking resistance as well as corrosion resistance, and can be applied to highly molded products such as design sinks.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

La présente invention concerne un acier inoxydable austénitique ayant une excellente aptitude au façonnage et une excellente résistance aux fissures antivieillissement qui ne provoque pas de défauts tels que des fissures de vieillissement ou des fractures retardées, etc., même lorsque l'acier inoxydable austénitique est appliqué sur un évier type dans lequel le rayon de courbure d'un coin est inférieur ou égal à 50 mm. L'acier inoxydable austénitique ayant une excellente aptitude au façonnage et une excellente résistance aux fissures anti-vieillissement, selon un mode de réalisation de la présente invention, comprend, en % en poids: 0,01 à 0,04 % de C; 0,1 à 1 % de Si; 0,1 à 2 % de Mn; 6 à 10 % de Ni; 16 à 20 % de Cr; 1 à 2 % de Cu; 0,01 à 0,2 % de Mo; 0,035 à 0,07 % de N; et le reste étant du Fe et des impuretés inévitables, la valeur de paramètre de stabilisation d'austénite (ASP) est de -3 ou moins et le coefficient d'écrouissage n dans la plage de déformation réelle de 0,3 à 0,4 satisfait la plage de 0,4 à 0,5.
PCT/KR2018/006853 2017-08-21 2018-06-18 Acier inoxydable austénitique ayant une excellente aptitude au façonnage et une excellente résistance aux fissures anti-vieillissement et produit d'étirage l'utilisant WO2019039715A1 (fr)

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JP2020511263A JP7256792B2 (ja) 2017-08-21 2018-06-18 加工性および耐時効割れ性に優れたオーステナイト系ステンレス鋼のドローイング加工品
CN201880068255.8A CN111247265B (zh) 2017-08-21 2018-06-18 加工性和抗季裂性优异的奥氏体不锈钢及利用它的拉伸加工产品

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KR1020170105277A KR101964314B1 (ko) 2017-08-21 2017-08-21 가공성 및 내시효균열성이 우수한 오스테나이트계 스테인리스강 및 이를 이용한 드로잉 가공품
KR10-2017-0105277 2017-08-21

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KR102120700B1 (ko) * 2018-09-13 2020-06-09 주식회사 포스코 확관가공성 및 내시효균열성이 우수한 오스테나이트계 스테인리스강
KR102448741B1 (ko) * 2020-08-31 2022-09-30 주식회사 포스코 심가공성이 향상된 오스테나이트계 스테인리스강
KR20220169655A (ko) * 2021-06-21 2022-12-28 주식회사 포스코 오스테나이트계 스테인리스강 및 그 제조방법

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JP2008169423A (ja) * 2007-01-10 2008-07-24 Nisshin Steel Co Ltd 曲げ加工用オーステナイト系ステンレス鋼板

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