WO2024058413A1 - Exterior material for home appliance and refrigerator comprising same - Google Patents

Exterior material for home appliance and refrigerator comprising same Download PDF

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Publication number
WO2024058413A1
WO2024058413A1 PCT/KR2023/010982 KR2023010982W WO2024058413A1 WO 2024058413 A1 WO2024058413 A1 WO 2024058413A1 KR 2023010982 W KR2023010982 W KR 2023010982W WO 2024058413 A1 WO2024058413 A1 WO 2024058413A1
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WO
WIPO (PCT)
Prior art keywords
stainless steel
steel sheet
exterior material
less
rolled steel
Prior art date
Application number
PCT/KR2023/010982
Other languages
French (fr)
Korean (ko)
Inventor
이석
고영덕
김광주
김용환
김충건
변다현
윤재익
이찬영
Original Assignee
삼성전자주식회사
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Publication date
Priority claimed from KR1020220134488A external-priority patent/KR20240037120A/en
Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Publication of WO2024058413A1 publication Critical patent/WO2024058413A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/24—Deep-drawing involving two drawing operations having effects in opposite directions with respect to the blank
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/02—Doors; Covers

Definitions

  • the disclosed invention relates to exterior materials for home appliances and refrigerators including the same.
  • the purpose of the disclosed invention to solve the above problems is to provide an exterior material for home appliances with improved dent resistance and moldability while reducing the thickness, and a refrigerator including the same.
  • An exterior material for a home appliance may include a cold-rolled stainless steel sheet.
  • the stainless steel cold-rolled steel sheet contains, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities, and the microstructure As such, it includes ferrite and martensite or more structures and may have a thickness of 0.3 mm or more and 0.5 mm or less.
  • a method of manufacturing an exterior material for home appliances includes, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities.
  • a refrigerator according to one embodiment.
  • the door may include an exterior material for home appliances.
  • the exterior material for the home appliance may include a cold-rolled stainless steel sheet.
  • the stainless steel cold-rolled steel sheet contains, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities, and the microstructure As such, it includes ferrite and martensite or more structures and may have a thickness of 0.3 mm or more and 0.5 mm or less.
  • an exterior material for home appliances with improved dent resistance and a refrigerator including the same can be provided.
  • Figure 1 is a schematic diagram showing an exterior material for home appliances according to an embodiment.
  • FIG. 2 is an enlarged schematic diagram of portion A of FIG. 1.
  • FIG. 3 is an enlarged schematic diagram of part B of FIG. 1.
  • Figure 4 is a schematic diagram showing deformation after molding.
  • Figure 5 is a schematic diagram showing a refrigerator according to one embodiment.
  • Figure 6 is an image showing the results of a dent test on the exterior material for home appliances according to Comparative Example 1.
  • Figure 7 is an image showing the results of a dent test on the exterior material for home appliances according to Example 1.
  • the exterior material for home appliances may include a cold-rolled stainless steel sheet.
  • the stainless steel cold-rolled steel sheet contains, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities, and the microstructure As such, it may contain structures other than ferrite and martensite, and the thickness may be 0.3 mm or more and 0.5 mm or less.
  • the exterior material for home appliances may include a cold-rolled stainless steel sheet.
  • the stainless steel cold-rolled steel sheet contains, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities, and the microstructure As such, it may contain structures other than ferrite and martensite, and the thickness may be 0.3 mm or more and 0.5 mm or less.
  • Figure 1 is a schematic diagram showing an exterior material for home appliances according to an embodiment.
  • the exterior material for home appliances may include a bending portion (B) with a bent edge formed by forming a cold-rolled stainless steel sheet.
  • the bending part can be coupled to the outside of the home appliance.
  • the exterior material for home appliances according to one embodiment can be used by combining it with the outside of a refrigerator door.
  • the exterior material for home appliances can be used in the outermost part of home appliances, and thus may be directly exposed to external shock.
  • the present invention seeks to provide an exterior material for home appliances including high-strength stainless steel cold-rolled steel sheets to protect home appliances from external shocks.
  • the unit is weight%.
  • the stainless steel cold-rolled steel sheet may contain, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other unavoidable impurities.
  • the C (carbon) content may be more than 0% and less than or equal to 0.12%.
  • C acts as an interstitial element and is an element effective in increasing strength due to the solid solution strengthening effect. However, if the C content is excessive, toughness may decrease and sudden brittle fracture may occur. Considering this, the upper limit of C content can be limited to 0.12%.
  • the content of Mn may be more than 0% and less than or equal to 1.0%.
  • Mn is a substitutional element with an atomic diameter similar to iron, and is an element that has a significant solid solution strengthening effect and improves the hardenability of steel.
  • Mn is an element that can contribute to the grain refinement effect by acting as an austenite stabilizing element and delaying ferrite and pearlite transformation.
  • Mn is an effective element that facilitates the transformation from austenite to martensite after heat treatment.
  • the Mn content is excessive, MnS inclusions are generated and central segregation is formed in the slabs and coils, which reduces the toughness and ductility of the steel and may cause brittle fracture.
  • the upper limit of Mn content may be limited to 1.0%.
  • the Cr (chromium) content may be greater than 16.0% and less than or equal to 18.0%.
  • Cr is an effective element in improving hardenability to secure strength and improve corrosion resistance. Considering this, Cr may be added in excess of 16.0%. However, if the Cr content is excessive, coarse carbides may be formed by combining with C, and toughness may become weak. Additionally, if the Cr content is excessive, a chromium oxide layer is formed on the surface, which may increase the C/A ratio of the corrosion pits and cause a notch effect. Therefore, if the Cr content is excessive, it is undesirable in terms of corrosion fatigue durability. Considering this, the upper limit of Cr content may be limited to 18.0%.
  • the remaining component of the disclosed invention is iron (Fe).
  • Fe iron
  • the stainless steel cold-rolled steel sheet may include ferrite and martensite structures as a microstructure by controlling the alloy composition and manufacturing method.
  • the stainless steel cold rolled steel sheet may have a thickness of 0.3 mm or more and 0.5 mm or less.
  • the thickness of cold-rolled stainless steel for refrigerator doors was 0.5 mm or more.
  • the disclosed invention seeks to reduce the thickness of the stainless steel cold-rolled steel sheet to a thinner thickness in order to reduce the amount of use.
  • the thickness of the cold-rolled stainless steel sheet is less than 0.3 mm, durability may deteriorate, such as the dent depth becoming very deep.
  • the lower limit of the thickness of the stainless steel cold rolled steel sheet may be 0.3 mm or more.
  • the stainless steel cold rolled steel sheet may include a hairline on the surface.
  • the stainless steel cold rolled steel sheet may further include a coating layer provided on the top.
  • FIG. 2 is an enlarged schematic diagram of portion A of FIG. 1.
  • the exterior material 10 for a home appliance may include a cold-rolled stainless steel sheet 11.
  • it may further include a hairline 12 formed on the surface of the stainless steel cold rolled steel sheet 11.
  • it may further include a coating layer 13 provided on the stainless steel cold rolled steel sheet 11.
  • the aesthetics of the exterior material 10 for home appliances can be improved through the hairline 12 formed on the surface of the stainless steel cold-rolled steel sheet 11.
  • the hairline 12 shown in FIG. 2 is only an example and may be implemented in various forms.
  • the hairline 12 may be formed in a straight or curved shape with regular intervals, or may have an irregular shape with different intervals.
  • the durability, corrosion resistance, and aesthetics of the exterior material 10 for home appliances can be improved through the coating layer 13 provided on the stainless steel cold-rolled steel sheet 11.
  • the exterior material for home appliances can utilize high-strength stainless steel cold-rolled steel sheets to improve durability while reducing the thickness. Therefore, the stainless steel cold rolled steel sheet may have a yield strength of 420 to 520 MPa.
  • the stainless steel cold rolled steel sheet may have an elongation of 20 to 30%.
  • the optimal elongation rate is derived through forming analysis.
  • the FLD Forming Limit Diagram
  • FLD is obtained through the Nakajima test to derive the elongation at which fracture may not occur.
  • FLD is a diagram indicating the forming limit according to the forming mode when forming a material, and the position or shape of the FLD may vary depending on the formability of the material.
  • molding analysis was performed by dividing the product into elements using molding analysis software and applying finite element analysis (FEA) to calculate the amount of deformation for each element when molding the product.
  • FEA finite element analysis
  • the exterior material for home appliances may have a dent depth of 0,5 mm or less at a test load of 200 N by controlling the alloy composition and manufacturing method. Meanwhile, as the test load increases, the dent depth can become deeper.
  • the bending angle of the bending portion may be 90 to 94 degrees.
  • Figure 3 is a schematic diagram showing an enlarged portion of part B of Figure 1.
  • part B in Figure 1 is a bending portion of the exterior material for the home appliance and can be coupled to the outside of the home appliance.
  • the bending part may have a bending angle of 90 to 94 degrees so that it can be easily coupled to the outside of the home appliance.
  • the bending angle of the bending portion may be 92 degrees.
  • the bending angle of the bending portion is less than 90 degrees or exceeds 94 degrees, it is not easy to couple it to the outside of the home appliance, so the entire production process of the home appliance may not proceed smoothly, which may reduce productivity.
  • a method of manufacturing an exterior material for home appliances includes, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities.
  • the method of manufacturing an exterior material for home appliances may further include a hairline forming step of forming a hairline on the surface of the stainless steel cold rolled steel sheet.
  • the method of manufacturing an exterior material for home appliances may further include a painting step of providing a painting layer on the upper part of the stainless steel cold-rolled steel sheet.
  • the stainless steel cold rolled steel sheet may have a yield strength of 420 to 520 MPa and an elongation of 20 to 30%. Additionally, the stainless steel cold rolled steel sheet may have a dent depth of 0.5 mm or less.
  • a method of manufacturing an exterior material for home appliances may include preparing and forming a series of cold-rolled stainless steel sheets, and may further include a hairline forming step and a painting step.
  • a stainless steel cold-rolled steel sheet can be prepared, and then the stainless steel cold-rolled steel sheet can be formed by pressing and bending to suit the purpose and function.
  • the forming step may include a process of bending the edge of the cold-rolled stainless steel sheet through a press mold die. At this time, deformation (spring back) may occur after molding due to the property of resisting deformation.
  • Figure 4 is a schematic diagram showing deformation after molding.
  • the overbending angle is expressed in degrees as the degree of bending further based on the bending angle of 92 degrees.
  • the yield strength increases, the property of resisting deformation may be greater. Therefore, when the yield strength increases, the amount of recovery in the elastic region is large and the amount of permanent deformation is small, so significant deformation may occur after molding. Therefore, when molding a material with high yield strength, it is necessary to set the overbending angle by taking more deformation after molding into consideration.
  • the over-bending angle may be 8 to 10 degrees.
  • a hairline forming step may be performed to form a hairline on the surface of the stainless steel cold rolled steel sheet.
  • the hairline can be formed into a straight hairline in the vertical and horizontal directions by applying a straight polishing method. Additionally, a circular hairline can be formed using a brush. However, it is not limited to this, and the shape of the hairline may appear in various ways depending on the desired design.
  • a painting step of providing a painting layer on the upper part of the stainless steel cold rolled steel sheet may be further included.
  • the coating layer can be prepared by applying the 1C1B (2-coated and 2-bake) method using UV coating. Additionally, the coating layer may be prepared using a 2-coated and 2-bake (2C2B) or 3-coated and 3-bake (3C3B) method. The coating method can be selected considering economic efficiency and productivity.
  • the paint layer may include at least one of a chemical treatment, a primer layer, a base layer, and a clear layer.
  • a refrigerator according to one embodiment.
  • the door may include an exterior material for home appliances.
  • the exterior material for the home appliance may include a cold-rolled stainless steel sheet.
  • the stainless steel cold-rolled steel sheet contains, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities, and the microstructure It includes ferrite and martensite structures and may have a thickness of 0.3 mm or more and 0.5 mm or less.
  • the exterior material for home appliances may further include a hairline formed on the surface of the stainless steel cold-rolled steel sheet, and may further include a painting layer provided on the stainless steel cold-rolled steel sheet.
  • the stainless steel cold rolled steel sheet may have a yield strength of 420 to 520 MPa and an elongation of 20 to 30%.
  • the stainless steel cold rolled steel sheet may have a dent depth of 0.5 mm or less.
  • the exterior material for home appliances may have a bending angle of 90 to 94 degrees.
  • Figure 5 is a schematic diagram showing a refrigerator according to one embodiment.
  • the refrigerator 100 may include a main body 110 and storage compartments 121 , 122 , and 123 formed by dividing the main body 110 into upper and lower sections.
  • the refrigerator 110 may include a door 130 that opens and closes the storage compartments 121, 122, and 123, and a cold air supply device (not shown) that supplies cold air to the storage compartments 121, 122, and 123.
  • the door 130 may include the exterior material 10 for the home appliance.
  • the main body 110 includes an inner case that forms the storage compartments (121, 122, 123), an external case that is joined to the outside of the internal case to form the exterior, and an insulating material that is foamed between the internal case and the external case to insulate the storage compartments (121, 122, 123). It can be configured to include.
  • the storage rooms 121, 122, and 123 may be divided into a plurality of partitions 115, and the interior of the storage rooms 121, 122, and 123 may include a plurality of shelves 125 and storage containers 126 to store food, etc. ) can be provided.
  • the storage rooms 121, 122, and 123 may be divided into a plurality of storage rooms 121, 122, and 123 by a partition 115, and the partition 115 is horizontally coupled inside the storage rooms 121, 122, and 123.
  • the partition 115 which has a T-shape by combining the first partition 117 and the second partition 119, can divide the storage compartments 121, 122, and 123 into three spaces.
  • the first storage compartment 121 and the second storage compartments 122 and 123 divided by the first partition 117 the first storage compartment 121 can be used as a refrigerator room, and the second storage compartments 122 and 123 can be used as a freezer compartment. can be used
  • each storage compartment 121, 122, and 123 may be used differently from the configuration described above.
  • the first storage compartment 121 and the second storage compartments 122 and 123 can be opened and closed by a door 130 rotatably coupled to the main body 110, respectively.
  • the door 130 is rotatably coupled to the main body 110 and includes a pair of first storage compartment doors 140 and 150 that open and close the first storage compartment 121, and a pair of first storage compartment doors 140 and 150 that are rotatably coupled to the main body 110 to open and close the first storage compartment 121. It may include a pair of second storage compartment doors (160, 170) that open and close the storage compartments (122, 123).
  • At least one of the pair of first storage doors 140 and 150 covers the gap between the pair of first storage doors 140 and 150 when the pair of first storage doors 140 and 150 are closed.
  • a rotating bar 180 may be provided.
  • the rotation bar 180 may be rotatably coupled to at least one of the pair of first storage doors 140 and 150.
  • the rotation bar 180 may be guided to rotate according to the opening and closing of the door to which the rotation bar 180 is coupled among the first storage compartment doors 140 and 150 by the rotation guide 180 formed on the inner case.
  • Door shelves 142 and 152 for storing food may be provided on the back of the pair of first storage doors 140 and 150, respectively.
  • Door shelves 162 and 172 for storing food may be provided on the back of the pair of second storage doors 160 and 170, respectively.
  • a blowing fan may be installed on at least one of the first storage compartment doors 140 and 150.
  • An inlet 147a may be provided in the upper portion of at least one of the pair of first storage compartment doors 140 and 150 to allow air to flow into the blowing fan.
  • An outlet provided to discharge airflow toward the gap G between the pair of first storage doors 140 and 150 may be provided on the side surface.
  • the pair of first storage doors 140 and 150 may include a first door 140 and a second door 150 provided on a side of the first door 140.
  • the first door and the second door are not limited to this, and the first door 160 of the pair of second storage doors 160 and 170 and the second door 170 provided on the side of the first door 160 It can be prepared by.
  • the structure of the fan case or guide duct accommodating the blowing fan is not limited to the structure of the door on which it is mounted, and can be applied to a refrigerator having a plurality of doors provided in parallel.
  • Table 1 below shows the dent depth according to yield strength and thickness.
  • Example 1 is an exterior material for home appliances containing a cold-rolled stainless steel sheet with a yield strength of 500 MPa and a thickness of 0.4 mm.
  • a stainless steel cold-rolled steel sheet containing C: 0.1%, Mn: 0.7%, Cr: 17.0%, the remaining Fe and other inevitable impurities, and containing ferrite and martensite or more as a microstructure was used.
  • Comparative Example 1 is an exterior material for home appliances containing a cold-rolled stainless steel sheet with a yield strength of 320 MPa and a thickness of 0.55 mm.
  • general STS 430 steel was applied.
  • the yield strength was measured at room temperature and under a tensile speed of 20 mm/min through a tensile tester, according to the ASTM KS B 0802 standard.
  • Microstructure was measured by observing the cross section of the specimen with an optical microscope.
  • the dent depth was expressed by measuring the dent depth that occurred after fixing the specimen to the jig and applying a load to the center of the specimen.
  • the load conditions were 150N, 200N, and 250N, and the test speed was 2mm/min.
  • the lower the dent depth the better the dent resistance.
  • Example 1 had a thin thickness but high yield strength, resulting in a shallow dent depth. That is, Example 1 had excellent dent resistance.
  • Comparative Example 1 was thick, the yield strength was low and the dent depth was deep. In other words, Comparative Example 1 had inferior dent resistance.
  • Figure 6 is an image showing the results of a dent test on the exterior material for home appliances according to Comparative Example 1
  • Figure 7 is an image showing the results of a dent test on the exterior material for home appliances according to Example 1.
  • the exterior material for home appliances according to one embodiment has excellent dent resistance.
  • Example 2 is an exterior material for home appliances using a cold-rolled stainless steel sheet with a yield strength of 420 MPa
  • Example 3 is an exterior material for home appliances using a cold-rolled stainless steel sheet with a yield strength of 520 MPa.
  • Example 2 After bending with a mold with an overbending angle of 5 degrees and measuring deformation after molding, the bending angle was measured to be 95.2 degrees. Therefore, since Example 2 was deformed by more than 3.2 degrees based on the bending angle of 92 degrees, it was confirmed that it was desirable to set the overbending angle to 8.2 degrees.
  • Example 3 After bending with a mold with an overbending angle of 5 degrees and measuring deformation after molding, the bending angle was measured to be 97 degrees. Therefore, since Example 3 was deformed by more than 5 degrees based on the bending angle of 92 degrees, it was confirmed that it was desirable to set the overbending angle to 10 degrees.
  • the amount of raw material used can be reduced and carbon emissions generated during steel production can be reduced, thereby contributing to the environment.
  • an exterior material for home appliances with improved dent resistance and excellent formability, despite using a thin cold-rolled stainless steel sheet, and a refrigerator including the same can be provided.
  • an exterior material for home appliances with improved dent resistance and a refrigerator including the same can be provided.

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Abstract

The disclosed invention relates to an exterior material for a home appliance and a refrigerator comprising same. An exterior material for a home appliance according to an embodiment may include a stainless steel cold rolled steel sheet. The stainless steel cold rolled steel sheet may contain, in wt%, more than 0% and 0.12% or less of C, more than 0% and 1.0% or less of Mn, and more than 16.0% and 18.0% or less of Cr, with the remainder comprising Fe and inevitable impurities, have a microstructure including a ferrite/martensite dual-phase structure, and have a thickness of 0.3-0.5 mm.

Description

가전기기용 외장재 및 이를 포함하는 냉장고 Exterior materials for home appliances and refrigerators containing the same
개시된 발명은 가전기기용 외장재 및 이를 포함하는 냉장고에 관한 것이다.The disclosed invention relates to exterior materials for home appliances and refrigerators including the same.
기후변화 방지를 위해 국제사회는 CO2 저감을 위한 규제가 강화되고 있다. 이러한 추세에 맞춰 CO2 배출 저감을 위해 부품 원소재 사용량을 저감하려는 연구가 활발히 진행되고 있다.To prevent climate change, the international community is strengthening regulations to reduce CO2 emissions. In line with this trend, research is being actively conducted to reduce the amount of raw material used in parts to reduce CO2 emissions.
한편, 냉장고 도어에 사용하는 스테인리스 스틸 강판의 사용량을 저감하기 위해서는, 두께를 얇게 축소해야 한다. 그러나, 두께가 얇은 강판을 활용하면, 내덴트성이 열위해지는 등 내구성이 약화되는 문제가 발생할 수 있다.Meanwhile, in order to reduce the amount of stainless steel used in refrigerator doors, the thickness must be reduced to thin. However, if a thin steel plate is used, problems such as poor dent resistance and weakened durability may occur.
이를 개선하기 위해 항복강도가 높은 강판을 적용하게 되면, 벤딩 각도 및 규격 치수가 벗어나는 등 성형성이 떨어지는 문제가 발생하였다.When steel plates with high yield strength were applied to improve this, problems with poor formability such as bending angles and standard dimensions occurred.
상기와 같은 문제점을 해결하기 위한 개시된 발명의 목적은, 두께를 축소하면서도 내덴트성 및 성형성이 향상된, 가전기기용 외장재 및 이를 포함하는 냉장고를 제공하는데 있다.The purpose of the disclosed invention to solve the above problems is to provide an exterior material for home appliances with improved dent resistance and moldability while reducing the thickness, and a refrigerator including the same.
일 실시예에 따른 가전기기용 외장재는, 스테인리스 스틸 냉연강판을 포함할 수 있다. 상기 스테인리스 스틸 냉연강판은, 중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함 하고, 미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함하고, 두께가 0.3mm 이상 0.5mm 이하일 수 있다.An exterior material for a home appliance according to an embodiment may include a cold-rolled stainless steel sheet. The stainless steel cold-rolled steel sheet contains, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities, and the microstructure As such, it includes ferrite and martensite or more structures and may have a thickness of 0.3 mm or more and 0.5 mm or less.
일 실시예에 따른 가전기기용 외장재 제조방법은, 중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함 하고, 미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함하고, 두께가 0.3mm 이상 0.5mm 이하인, 스테인리스 스틸 냉연강판을 준비하는 단계; 및 상기 스테인리스 스틸 냉연강판을 성형하는 단계를 포함할 수 있다.A method of manufacturing an exterior material for home appliances according to an embodiment includes, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities. Preparing a stainless steel cold-rolled steel sheet, including a microstructure of ferrite and martensite or more, and having a thickness of 0.3 mm or more and 0.5 mm or less; And it may include forming the stainless steel cold rolled steel sheet.
일 실시예에 따른 냉장고는. 본체; 상기 본체 내부에 마련되는 저장실; 및 상기 저장실의 적어도 일부를 개폐하도록 상기 본체에 회전 가능하게 결합되는 도어를 포함할 수 있다. 상기 도어는, 가전기기용 외장재를 포함할 수 있다. 상기 가전기기용 외장재는, 스테인리스 스틸 냉연강판을 포함할 수 있다. 상기 스테인리스 스틸 냉연강판은, 중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함 하고, 미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함하고, 두께가 0.3mm 이상 0.5mm 이하일 수 있다.A refrigerator according to one embodiment. main body; a storage compartment provided inside the main body; And it may include a door rotatably coupled to the main body to open and close at least a portion of the storage compartment. The door may include an exterior material for home appliances. The exterior material for the home appliance may include a cold-rolled stainless steel sheet. The stainless steel cold-rolled steel sheet contains, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities, and the microstructure As such, it includes ferrite and martensite or more structures and may have a thickness of 0.3 mm or more and 0.5 mm or less.
일 실시예에 의하면, 고강도 스테인리스 스틸 냉연강판을 적용하여, 내덴트성이 향상된 가전기기용 외장재 및 이를 포함하는 냉장고를 제공할 수 있다. 또한, 일 실시예에 의하면, 최적의 연신율 및 오버 벤딩 각도를 도출하여 성형성이 향상된 가전기기용 외장재 및 이를 포함하는 냉장고를 제공할 수 있다.According to one embodiment, by applying a high-strength stainless steel cold-rolled steel sheet, an exterior material for home appliances with improved dent resistance and a refrigerator including the same can be provided. In addition, according to one embodiment, it is possible to provide an exterior material for home appliances with improved formability by deriving an optimal elongation and over-bending angle, and a refrigerator including the same.
다만, 실시예 들에 따른 가전기기용 외장재 및 이를 포함하는 냉장고가 달성할 수 있는 효과는 이상에서 언급한 것들로 제한되지 않으며, 언급하지 않은 또 다른 효과들은 아래의 기재로부터 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 명확하게 이해될 수 있을 것이다.However, the effects that can be achieved by the exterior material for home appliances and the refrigerator containing the same according to the embodiments are not limited to those mentioned above, and other effects not mentioned can be found in the technical field to which the present invention belongs from the description below. It will be clearly understandable to those with ordinary knowledge.
도 1은, 일 실시예에 따른 가전기기용 외장재를 도시한 모식도이다.Figure 1 is a schematic diagram showing an exterior material for home appliances according to an embodiment.
도 2는, 도 1의 A 부분을 확대해서 도시한 모식도이다.FIG. 2 is an enlarged schematic diagram of portion A of FIG. 1.
도 3은, 도 1의 B 부분을 확대해서 도시한 모식도이다.FIG. 3 is an enlarged schematic diagram of part B of FIG. 1.
도 4는, 성형 후 변형을 나타낸 모식도이다.Figure 4 is a schematic diagram showing deformation after molding.
도 5는, 일 실시예에 따른 냉장고를 나타낸 모식도이다.Figure 5 is a schematic diagram showing a refrigerator according to one embodiment.
도 6은, 비교예1에 따른 가전기기용 외장재의 덴트 실험 결과를 나타낸 이미지이다.Figure 6 is an image showing the results of a dent test on the exterior material for home appliances according to Comparative Example 1.
도 7은, 실시예1에 따른 가전기기용 외장재의 덴트 실험 결과를 나타낸 이미지이다.Figure 7 is an image showing the results of a dent test on the exterior material for home appliances according to Example 1.
일 실시예에 따른 가전기기용 외장재는, 스테인리스 스틸 냉연강판을 포함할 수 있다. 상기 스테인리스 스틸 냉연강판은, 중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함 하고, 미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함하고, 두께가 0.3mm 이상 0.5mm 이하일 수 있다.The exterior material for home appliances according to one embodiment may include a cold-rolled stainless steel sheet. The stainless steel cold-rolled steel sheet contains, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities, and the microstructure As such, it may contain structures other than ferrite and martensite, and the thickness may be 0.3 mm or more and 0.5 mm or less.
이하에서는 개시된 발명의 실시 예를 첨부 도면을 참고하여 상세히 설명한다. 이하의 실시 예는 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 개시된 발명의 사상을 충분히 전달하기 위해 제시하는 것이다. 본 발명은 여기서 제시한 실시 예만으로 한정되지 않고 다른 형태로 구체화될 수도 있다. 도면은 본 발명을 명확히 하기 위해 설명과 관계 없는 부분의 도시를 생략하고, 이해를 돕기 위해 구성요소의 크기를 다소 과장하여 표현할 수 있다.Hereinafter, embodiments of the disclosed invention will be described in detail with reference to the accompanying drawings. The following examples are presented to sufficiently convey the spirit of the disclosed invention to those skilled in the art. The present invention is not limited to the embodiments presented herein and may be embodied in other forms. In order to clarify the present invention, the drawings may omit illustrations of parts unrelated to the description and may slightly exaggerate the sizes of components to aid understanding.
명세서 전체에서, 어떤 부분이 어떤 구성요소를 "포함"한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 포함할 수 있는 것을 의미한다.Throughout the specification, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary.
단수의 표현은 문맥상 명백하게 예외가 있지 않는 한, 복수의 표현을 포함한다.Singular expressions include plural expressions unless the context clearly makes an exception.
일 실시예에 따른 가전기기용 외장재는, 스테인리스 스틸 냉연강판을 포함할 수 있다. 상기 스테인리스 스틸 냉연강판은, 중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함 하고, 미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함하고, 두께가 0.3mm 이상 0.5mm 이하일 수 있다.The exterior material for home appliances according to one embodiment may include a cold-rolled stainless steel sheet. The stainless steel cold-rolled steel sheet contains, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities, and the microstructure As such, it may contain structures other than ferrite and martensite, and the thickness may be 0.3 mm or more and 0.5 mm or less.
도 1은, 일 실시예에 따른 가전기기용 외장재를 도시한 모식도이다.Figure 1 is a schematic diagram showing an exterior material for home appliances according to an embodiment.
도 1을 참고하면, 일 실시예에 따른 가전기기용 외장재는, 스테인리스 스틸 냉연강판을 성형하여 가장자리가 굽은 벤딩부(B)를 포함할 수 있다. 상기 벤딩부는, 가전기기 외부와 결합할 수 있다. 예를 들어, 일 실시예에 따른 가전기기용 외장재는, 냉장고 도어 외부에 결합하여 활용될 수 있다.Referring to FIG. 1, the exterior material for home appliances according to one embodiment may include a bending portion (B) with a bent edge formed by forming a cold-rolled stainless steel sheet. The bending part can be coupled to the outside of the home appliance. For example, the exterior material for home appliances according to one embodiment can be used by combining it with the outside of a refrigerator door.
일 실시예에 따른 가전기기용 외장재는, 가전기기의 최외곽에 활용될 수 있으므로, 외부 충격에 직접 노출될 수 있다. 본 발명에서는 외부 충격으로부터 가전기기를 보호할 수 있도록 고강도 스테인리스 스틸 냉연강판을 포함한 가전기기용 외장재를 제공하고자 한다.The exterior material for home appliances according to one embodiment can be used in the outermost part of home appliances, and thus may be directly exposed to external shock. The present invention seeks to provide an exterior material for home appliances including high-strength stainless steel cold-rolled steel sheets to protect home appliances from external shocks.
이하, 개시된 발명의 실시예 에서의 합금성분 함량의 수치 한정 이유에 대하여 설명한다. 이하에서는 특별한 언급이 없는 한 단위는 중량%이다.Hereinafter, the reason for limiting the numerical value of the alloy component content in the embodiments of the disclosed invention will be explained. Hereinafter, unless otherwise specified, the unit is weight%.
상기 스테인리스 스틸 냉연강판은, 중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함할 수 있다.The stainless steel cold-rolled steel sheet may contain, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other unavoidable impurities.
C(탄소)의 함량은 0% 초과 0.12% 이하일 수 있다.The C (carbon) content may be more than 0% and less than or equal to 0.12%.
C는 침입형 원소로 작용하여 고용강화 효과에 따른 강도 증가에 유효한 원소이다. 그러나, C의 함량이 과다한 경우에는, 인성이 저하되어 급작스런 취성 파단이 유발될 수 있다. 이를 고려하여, C 함량의 상한은 0.12%로 제한될 수 있다.C acts as an interstitial element and is an element effective in increasing strength due to the solid solution strengthening effect. However, if the C content is excessive, toughness may decrease and sudden brittle fracture may occur. Considering this, the upper limit of C content can be limited to 0.12%.
Mn(망간)의 함량은 0% 초과 1.0% 이하일 수 있다.The content of Mn (manganese) may be more than 0% and less than or equal to 1.0%.
Mn은 원자 직경이 철과 유사한 치환형 원소로써, 고용 강화 효과가 크고, 강의 경화능을 향상시키는 원소이다. 또한, Mn은 오스테나이트 안정화 원소로 작용하여 페라이트 및 펄라이트 변태를 지연시켜 결정립 미세화 효과에 기여할 수 있는 원소이다. 또한, Mn은 열처리 후 오스테나이트에서 마르텐사이트 변태를 쉽게 하는 작용을 하는데 효과적인 원소이다. 그러나, Mn의 함량이 과다한 경우에는, MnS 개재물이 생성되어 슬라브 및 코일에 중심 편석을 형성시켜 강의 인성 및 연성이 저하되고 취성 파단이 일어날 수 있다. 이를 고려하여, Mn 함량의 상한은 1.0%로 제한될 수 있다.Mn is a substitutional element with an atomic diameter similar to iron, and is an element that has a significant solid solution strengthening effect and improves the hardenability of steel. In addition, Mn is an element that can contribute to the grain refinement effect by acting as an austenite stabilizing element and delaying ferrite and pearlite transformation. In addition, Mn is an effective element that facilitates the transformation from austenite to martensite after heat treatment. However, if the Mn content is excessive, MnS inclusions are generated and central segregation is formed in the slabs and coils, which reduces the toughness and ductility of the steel and may cause brittle fracture. Considering this, the upper limit of Mn content may be limited to 1.0%.
Cr(크롬)의 함량은 16.0% 초과 18.0 % 이하일 수 있다.The Cr (chromium) content may be greater than 16.0% and less than or equal to 18.0%.
Cr은 경화능을 향상시켜 강도를 확보하고 내식성을 향상시키는데 효과적인 원소이다. 이를 고려하여, Cr은 16.0% 초과하여 첨가될 수 있다. 그러나, Cr의 함량이 과다한 경우에는, C와 결합하여 조대한 탄화물이 형성되고, 인성이 취약해질 수 있다. 또한, Cr의 함량이 과다한 경우에는, 표면에 크롬산화층이 형성되어 부식 피트의 C/A ratio가 켜져 노치효과를 발생시킬 수 있다. 따라서, Cr의 함량이 과다한 경우에는, 부식피로 내구성 측면에서 바람직하지 못하다. 이를 고려하여, Cr 함량의 상한은 18.0%로 제한될 수 있다. Cr is an effective element in improving hardenability to secure strength and improve corrosion resistance. Considering this, Cr may be added in excess of 16.0%. However, if the Cr content is excessive, coarse carbides may be formed by combining with C, and toughness may become weak. Additionally, if the Cr content is excessive, a chromium oxide layer is formed on the surface, which may increase the C/A ratio of the corrosion pits and cause a notch effect. Therefore, if the Cr content is excessive, it is undesirable in terms of corrosion fatigue durability. Considering this, the upper limit of Cr content may be limited to 18.0%.
개시된 발명의 나머지 성분은 철(Fe)이다. 다만, 통상의 제조과정에서는 원료 또는 주위 환경으로부터 의도되지 않는 불순물들이 불가피하게 혼입될 수 있으므로, 이를 배제할 수는 없다. 이들 불순물들은 통상의 제조과정의 기술자라면 누구라도 알 수 있는 것이기 때문에 그 모든 내용을 특별히 본 명세서에서 언급하지는 않는다.The remaining component of the disclosed invention is iron (Fe). However, in the normal manufacturing process, unintended impurities from raw materials or the surrounding environment may inevitably be mixed, so this cannot be ruled out. Since these impurities are known to anyone skilled in the ordinary manufacturing process, all of them are not specifically mentioned in this specification.
상기 스테인리스 스틸 냉연강판은, 합금조성 및 제조방법을 제어함으로써, 미세조직으로 페라이트 및 마르텐사이트 이상 조직을 포함할 수 있다.The stainless steel cold-rolled steel sheet may include ferrite and martensite structures as a microstructure by controlling the alloy composition and manufacturing method.
또한, 상기 스테인리스 스틸 냉연강판은, 두께가 0.3mm 이상 0.5mm 이하일 수 있다.Additionally, the stainless steel cold rolled steel sheet may have a thickness of 0.3 mm or more and 0.5 mm or less.
종래에는 냉장고 도어용 스테인리스 스틸 냉연강판의 두께가 0.5mm 이상이었다. 그러나, 상술한 바와 같이, 개시된 발명에서는 스테인리스 스틸 냉연강판의 사용량을 저감하기 위해 두께를 얇게 축소하고자 한다. 다만, 상기 스테인리스 스틸 냉연강판의 두께가 0.3mm 미만인 경우에는, 덴트 깊이가 매우 깊어지는 등 내구성이 악화될 수 있다. 이를 고려하여, 상기 스테인리스 스틸 냉연강판 두께의 하한은 0.3mm 이상으로 할 수 있다.Previously, the thickness of cold-rolled stainless steel for refrigerator doors was 0.5 mm or more. However, as described above, the disclosed invention seeks to reduce the thickness of the stainless steel cold-rolled steel sheet to a thinner thickness in order to reduce the amount of use. However, if the thickness of the cold-rolled stainless steel sheet is less than 0.3 mm, durability may deteriorate, such as the dent depth becoming very deep. Considering this, the lower limit of the thickness of the stainless steel cold rolled steel sheet may be 0.3 mm or more.
상기 스테인리스 스틸 냉연강판은, 표면에 헤어라인을 포함할 수 있다. 또한, 상기 스테인리스 스틸 냉연강판은, 상부에 마련되는 도장층을 더 포함할 수 있다.The stainless steel cold rolled steel sheet may include a hairline on the surface. In addition, the stainless steel cold rolled steel sheet may further include a coating layer provided on the top.
도 2는, 도 1의 A 부분을 확대해서 도시한 모식도이다.FIG. 2 is an enlarged schematic diagram of portion A of FIG. 1.
도 2를 참고하면, 일 실시예에 따른 가전기기용 외장재(10)는, 스테인리스 스틸 냉연강판(11)을 포함할 수 있다. 또한, 상기 스테인리스 스틸 냉연강판(11) 표면에 형성되는 헤어라인(12)을 더 포함할 수 있다. 또한, 상기 스테인리스 스틸 냉연강판(11) 상부에 마련되는 도장층(13)을 더 포함할 수 있다.Referring to FIG. 2, the exterior material 10 for a home appliance according to an embodiment may include a cold-rolled stainless steel sheet 11. In addition, it may further include a hairline 12 formed on the surface of the stainless steel cold rolled steel sheet 11. In addition, it may further include a coating layer 13 provided on the stainless steel cold rolled steel sheet 11.
상기 스테인리스 스틸 냉연강판(11) 표면에 형성되는 헤어라인(12)을 통해 가전기기용 외장재(10)의 심미감을 향상시킬 수 있다. 다만, 도 2에 나타난 헤어라인(12)은 일 예에 불과하며, 다양한 형태로 구현될 수 있다. 예를들어, 상기 헤어라인(12)은 일정한 간격의 직선형 또는 곡선형으로 형성될 수 있고, 간격이 서로 다르게 불규칙한 형상으로 나타날 수도 있다.The aesthetics of the exterior material 10 for home appliances can be improved through the hairline 12 formed on the surface of the stainless steel cold-rolled steel sheet 11. However, the hairline 12 shown in FIG. 2 is only an example and may be implemented in various forms. For example, the hairline 12 may be formed in a straight or curved shape with regular intervals, or may have an irregular shape with different intervals.
상기 스테인리스 스틸 냉연강판(11) 상부에 마련되는 도장층(13)을 통해 가전기기용 외장재(10)의 내구성, 내식성 및 심미감이 향상될 수 있다.The durability, corrosion resistance, and aesthetics of the exterior material 10 for home appliances can be improved through the coating layer 13 provided on the stainless steel cold-rolled steel sheet 11.
개시된 발명의 일 예에 따른 가전기기용 외장재는, 두께를 얇게 축소하면서도 내구성을 향상시키기 위해, 고강도 스테인리스 스틸 냉연강판을 활용할 수 있다. 따라서, 상기 스테인리스 스틸 냉연강판은, 항복강도가 420 내지 520MPa일 수 있다.The exterior material for home appliances according to an example of the disclosed invention can utilize high-strength stainless steel cold-rolled steel sheets to improve durability while reducing the thickness. Therefore, the stainless steel cold rolled steel sheet may have a yield strength of 420 to 520 MPa.
상기 스테인리스 스틸 냉연강판은, 연신율이 20 내지 30%일 수 있다.The stainless steel cold rolled steel sheet may have an elongation of 20 to 30%.
일반적으로 스테인리스 스틸 냉연강판은, 항복강도가 크면 성형성이 떨어질 수 있다. 따라서, 고강도 냉연강판의 경우, 성형에 따른 파단이 발생할 수 있다.In general, if the yield strength of stainless steel cold rolled steel sheet is high, the formability may be poor. Therefore, in the case of high-strength cold-rolled steel sheets, fracture may occur during forming.
개시된 발명에서는 성형해석을 통해 최적의 연신율을 도출하고자 한다. 구체적으로, 나카지마 시험법(Nakajima test)를 통해 FLD(Forming Limit Diagram)를 구하여 파단이 발생하지 않을 수 있는 연신율을 도출한다. 한편, FLD는 재료 성형 시, 성형 모드에 따른 성형한계를 나타내는 선도로써, 재료의 성형성에 따라 FLD의 위치나 형상이 달라질 수 있다.In the disclosed invention, the optimal elongation rate is derived through forming analysis. Specifically, the FLD (Forming Limit Diagram) is obtained through the Nakajima test to derive the elongation at which fracture may not occur. Meanwhile, FLD is a diagram indicating the forming limit according to the forming mode when forming a material, and the position or shape of the FLD may vary depending on the formability of the material.
개시된 발명에서는 성형해석 소프트웨어를 이용하여 제품을 요소(Element)로 나누어 유한요소해석(FEA)을 적용하여, 제품을 성형 시 각 요소 별 변형량을 계산하는 방법으로 성형해석을 진행했다. 이를 통해 도출된 연신율은, 20 내지 30%이고, 연신율이 20% 미만일 경우에는 파단이 발생하는 것으로 예상되었다.In the disclosed invention, molding analysis was performed by dividing the product into elements using molding analysis software and applying finite element analysis (FEA) to calculate the amount of deformation for each element when molding the product. The elongation rate derived through this was 20 to 30%, and it was expected that fracture would occur if the elongation rate was less than 20%.
일 실시예에 따른 가전기기용 외장재는, 합금조성 및 제조방법 등을 제어함으로써, 시험하중 200N에서의 덴트 깊이가 0,5mm 이하일 수 있다. 한편, 시험하중이 커질수록 덴트 깊이는 깊어질 수 있다.The exterior material for home appliances according to one embodiment may have a dent depth of 0,5 mm or less at a test load of 200 N by controlling the alloy composition and manufacturing method. Meanwhile, as the test load increases, the dent depth can become deeper.
일 실시예에 따른 가전기기용 외장재는, 벤딩부의 벤딩 각도가 90 내지 94도일 수 있다.In the exterior material for home appliances according to one embodiment, the bending angle of the bending portion may be 90 to 94 degrees.
도 3은, 도 1의 B 부분을 확대해서 도시한 모식도이다.Figure 3 is a schematic diagram showing an enlarged portion of part B of Figure 1.
도 3을 참고하면, 상기 가전기기용 외장재의 벤딩 각도를 확인할 수 있다. 한편, 도 1의 B 부분은 상기 가전기기용 외장재의 벤딩부로써, 가전기기 외부에 결합될 수 있다. 상기 벤딩부는 가전기기 외부에 용이하게 결합될 수 있도록 벤딩 각도가 90 내지 94도로 형성될 수 있다. 바람직하게는, 상기 벤딩부의 벤딩 각도는 92도일 수 있다.Referring to Figure 3, the bending angle of the exterior material for the home appliance can be confirmed. Meanwhile, part B in Figure 1 is a bending portion of the exterior material for the home appliance and can be coupled to the outside of the home appliance. The bending part may have a bending angle of 90 to 94 degrees so that it can be easily coupled to the outside of the home appliance. Preferably, the bending angle of the bending portion may be 92 degrees.
상기 벤딩부의 벤딩 각도가 90도 미만이거나, 94도를 초과하면, 가전기기 외부에 결합이 용이하지 않으므로, 가전기기 전체 생산공정이 원활하게 진행되지 않아 생산성이 떨어질 수 있다.If the bending angle of the bending portion is less than 90 degrees or exceeds 94 degrees, it is not easy to couple it to the outside of the home appliance, so the entire production process of the home appliance may not proceed smoothly, which may reduce productivity.
다음으로, 개시된 발명의 다른 일 측면에 따른 가전기기용 외장재 제조방법에 대해 구체적으로 설명한다.Next, a method for manufacturing an exterior material for home appliances according to another aspect of the disclosed invention will be described in detail.
일 실시예에 따른 가전기기용 외장재 제조방법은, 중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함 하고, 미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함하고, 두께가 0.3mm 이상 0.5mm 이하인, 스테인리스 스틸 냉연강판을 준비하는 단계; 및 상기 스테인리스 스틸 냉연강판을 성형하는 단계를 포함할 수 있다.A method of manufacturing an exterior material for home appliances according to an embodiment includes, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities. Preparing a stainless steel cold-rolled steel sheet, including a microstructure of ferrite and martensite or more, and having a thickness of 0.3 mm or more and 0.5 mm or less; And it may include forming the stainless steel cold rolled steel sheet.
일 실시예에 따른 가전기기용 외장재 제조방법은, 상기 스테인리스 스틸 냉연강판 표면에 헤어라인을 형성시키는 헤어라인 형성 단계를 더 포함할 수 있다.The method of manufacturing an exterior material for home appliances according to an embodiment may further include a hairline forming step of forming a hairline on the surface of the stainless steel cold rolled steel sheet.
또한, 일 실시예에 따른 가전기기용 외장재 제조방법은, 상기 스테인리스 스틸 냉연강판 상부에 도장층을 마련하는 도장 단계를 더 포함할 수 있다.In addition, the method of manufacturing an exterior material for home appliances according to an embodiment may further include a painting step of providing a painting layer on the upper part of the stainless steel cold-rolled steel sheet.
상기 스테인리스 스틸 냉연강판은, 항복강도가 420 내지 520MPa일 수 있고, 연신율이 20 내지 30%일 수 있다. 또한, 상기 스테인리스 스틸 냉연강판은, 덴트 깊이가 0,5mm 이하일 수 있다.The stainless steel cold rolled steel sheet may have a yield strength of 420 to 520 MPa and an elongation of 20 to 30%. Additionally, the stainless steel cold rolled steel sheet may have a dent depth of 0.5 mm or less.
스테인리스 스틸 냉연강판의 성분 함량, 미세조직 및 물성에 대한 설명은 상술한 바와 같고, 이하 가전기기용 외장재 제조방법에 대하여 구체적으로 설명한다.The description of the component content, microstructure, and physical properties of the stainless steel cold-rolled steel sheet is as described above, and the method of manufacturing exterior materials for home appliances will be described in detail below.
일 실시예에 따른 가전기기용 외장재의 제조방법은, 일련의 스테인리스 스틸 냉연강판을 준비하는 단계, 성형하는 단계를 포함할 수 있고, 헤어라인 형성 단계 및 도장 단계를 더 포함할 수 있다.A method of manufacturing an exterior material for home appliances according to an embodiment may include preparing and forming a series of cold-rolled stainless steel sheets, and may further include a hairline forming step and a painting step.
먼저, 스테인리스 스틸 냉연강판을 준비한 다음, 상기 스테인리스 스틸 냉연강판을 목적 및 기능에 맞게 프레스 및 벤딩 등 성형할 수 있다.First, a stainless steel cold-rolled steel sheet can be prepared, and then the stainless steel cold-rolled steel sheet can be formed by pressing and bending to suit the purpose and function.
상기 성형하는 단계는, 프레스 금형 다이를 통해 스테인리스 스틸 냉연강판의 가장자리를 벤딩하는 공정을 포함할 수 있다. 이때, 변형에 반발하는 성질로 인한 성형 후 변형(Spring back)이 발생할 수 있다.The forming step may include a process of bending the edge of the cold-rolled stainless steel sheet through a press mold die. At this time, deformation (spring back) may occur after molding due to the property of resisting deformation.
도 4는, 성형 후 변형을 나타낸 모식도이다.Figure 4 is a schematic diagram showing deformation after molding.
도 4를 참고하면, 변형에 반발하는 성질로 인한 성형 후 변형이 일어나는 과정을 확인할 수 있다. 여기서 오버 벤딩 각도는, 벤딩 각도 92도를 기준으로 더 많이 벤딩한 정도를 각도로 표시한 것이다.Referring to Figure 4, you can see the process in which deformation occurs after molding due to the property of resisting deformation. Here, the overbending angle is expressed in degrees as the degree of bending further based on the bending angle of 92 degrees.
한편, 항복강도가 증가하면 변형에 반발하는 성질이 더 크게 나타날 수 있다. 따라서, 항복강도가 증가하면 탄성 영역의 회복량이 크고 영구 변형량이 적어 성형 후 변형이 크게 발생할 수 있다. 따라서, 항복강도가 높은 소재를 성형할 경우에는, 성형 후 변형을 더 많이 고려하여 오버 벤딩 각도를 설정할 필요가 있다.On the other hand, as the yield strength increases, the property of resisting deformation may be greater. Therefore, when the yield strength increases, the amount of recovery in the elastic region is large and the amount of permanent deformation is small, so significant deformation may occur after molding. Therefore, when molding a material with high yield strength, it is necessary to set the overbending angle by taking more deformation after molding into consideration.
개시된 발명은 고강도 스테인리스 스틸 냉연강판을 활용하므로, 오버 밴딩 각도가 8 내지 10도일 수 있다.Since the disclosed invention utilizes a high-strength stainless steel cold-rolled steel sheet, the over-bending angle may be 8 to 10 degrees.
다음으로, 상기 스테인리스 스틸 냉연강판 표면에 헤어라인을 형성시키는 헤어라인 형성 단계를 수행할 수 있다.Next, a hairline forming step may be performed to form a hairline on the surface of the stainless steel cold rolled steel sheet.
상기 헤어라인은, 직선형 연마공법이 적용되어 세로 및 가로 방향의 직선형 헤어라인을 형성시킬 수 있다. 또한, 브러쉬를 통한 원형 헤어라인을 형성시킬 수 있다. 다만, 이에 한정되지 않고, 목적하는 디자인에 따라 헤어라인의 형태는 다양하게 나타날 수 있다.The hairline can be formed into a straight hairline in the vertical and horizontal directions by applying a straight polishing method. Additionally, a circular hairline can be formed using a brush. However, it is not limited to this, and the shape of the hairline may appear in various ways depending on the desired design.
그 후, 상기 스테인리스 스틸 냉연강판 상부에 도장층을 마련하는 도장 단계를 더 포함할 수 있다.Afterwards, a painting step of providing a painting layer on the upper part of the stainless steel cold rolled steel sheet may be further included.
상기 도장층은, UV 코팅을 적용한 1C1B(2-coated and 2-bake)방식을 적용하여 마련될 수 있다. 또한, 상기 도장층은, 2C2B(2-coated and 2-bake) 또는 3C3B(3-coated and 3-bake)방식으로도 마련될 수 있다. 도장 방식은 경제성 및 생산성을 고려하여 선택될 수 있다. 상기 도장층은, 화학처리, 프라이머 층, 베이스 층 및 클리어 층 중 적어도 하나를 포함할 수 있다.The coating layer can be prepared by applying the 1C1B (2-coated and 2-bake) method using UV coating. Additionally, the coating layer may be prepared using a 2-coated and 2-bake (2C2B) or 3-coated and 3-bake (3C3B) method. The coating method can be selected considering economic efficiency and productivity. The paint layer may include at least one of a chemical treatment, a primer layer, a base layer, and a clear layer.
다음으로, 개시된 발명의 다른 일 측면에 따른 냉장고를 구체적으로 설명한다.Next, a refrigerator according to another aspect of the disclosed invention will be described in detail.
일 실시예에 따른 냉장고는. 본체; 상기 본체 내부에 마련되는 저장실; 및 상기 저장실의 적어도 일부를 개폐하도록 상기 본체에 회전 가능하게 결합되는 도어를 포함할 수 있다. 상기 도어는, 가전기기용 외장재를 포함할 수 있다. 상기 가전기기용 외장재는, 스테인리스 스틸 냉연강판을 포함할 수 있다. 상기 스테인리스 스틸 냉연강판은, 중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함 하고, 미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함하고, 두께가 0.3mm 이상 0.5mm 이하일 수 있다.A refrigerator according to one embodiment. main body; a storage compartment provided inside the main body; And it may include a door rotatably coupled to the main body to open and close at least a portion of the storage compartment. The door may include an exterior material for home appliances. The exterior material for the home appliance may include a cold-rolled stainless steel sheet. The stainless steel cold-rolled steel sheet contains, in weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, the remaining Fe and other inevitable impurities, and the microstructure It includes ferrite and martensite structures and may have a thickness of 0.3 mm or more and 0.5 mm or less.
상기 가전기기용 외장재는, 스테인리스 스틸 냉연강판 표면에 형성되는 헤어라인을 더 포함하고, 스테인리스 스틸 냉연강판 상부에 마련되는 도장층을 더 포함할 수 있다.The exterior material for home appliances may further include a hairline formed on the surface of the stainless steel cold-rolled steel sheet, and may further include a painting layer provided on the stainless steel cold-rolled steel sheet.
상기 스테인리스 스틸 냉연강판은, 항복강도가 420 내지 520MPa이고, 연신율이 20 내지 30%일 수 있다.The stainless steel cold rolled steel sheet may have a yield strength of 420 to 520 MPa and an elongation of 20 to 30%.
또한, 상기 스테인리스 스틸 냉연강판은, 덴트 깊이가 0.5mm 이하일 수 있다.Additionally, the stainless steel cold rolled steel sheet may have a dent depth of 0.5 mm or less.
상기 가전기기용 외장재는, 벤딩부의 벤딩 각도가 90 내지 94도일 수 있다.The exterior material for home appliances may have a bending angle of 90 to 94 degrees.
가전기기용 외장재에 대한 설명은 상술한 바와 같고, 이하 일 실시예에 대한 냉장고에 대해 구체적으로 개시한다.The description of the exterior material for home appliances is as described above, and the refrigerator according to one embodiment will be described in detail below.
도 5는, 일 실시예에 따른 냉장고를 나타낸 모식도이다.Figure 5 is a schematic diagram showing a refrigerator according to one embodiment.
도 5를 참고하면, 일 실시예에 따른 냉장고(100)는 본체(110)와, 본체(110) 내부에 상하로 구획되어 형성되는 저장실(121, 122, 123)를 포함할 수 있다. 냉장고(110)는 저장실(121, 122, 123)을 개폐하는 도어(130)와, 저장실(121, 122, 123)에 냉기를 공급하는 냉기공급장치(미도시)를 포함할 수 있다.Referring to FIG. 5 , the refrigerator 100 according to one embodiment may include a main body 110 and storage compartments 121 , 122 , and 123 formed by dividing the main body 110 into upper and lower sections. The refrigerator 110 may include a door 130 that opens and closes the storage compartments 121, 122, and 123, and a cold air supply device (not shown) that supplies cold air to the storage compartments 121, 122, and 123.
상기 도어(130)는, 상기 가전기기용 외장재(10)를 포함할 수 있다.The door 130 may include the exterior material 10 for the home appliance.
본체(110)는 저장실(121, 122, 123)을 형성하는 내상과 내상의 외측에 결합되어 외관을 형성하는 외상과 내상과 외상 사이에 발포되어 저장실(121, 122, 123)을 단열시키는 단열재를 포함하여 구성될 수 있다.The main body 110 includes an inner case that forms the storage compartments (121, 122, 123), an external case that is joined to the outside of the internal case to form the exterior, and an insulating material that is foamed between the internal case and the external case to insulate the storage compartments (121, 122, 123). It can be configured to include.
저장실(121, 122, 123)은 파티션(115)에 의해 복수로 구획될 수 있으며, 저장실(121, 122, 123)의 내부에는 음식물 등을 저장할 수 있도록 복수의 선반(125) 및 저장용기(126)가 마련될 수 있다.The storage rooms 121, 122, and 123 may be divided into a plurality of partitions 115, and the interior of the storage rooms 121, 122, and 123 may include a plurality of shelves 125 and storage containers 126 to store food, etc. ) can be provided.
저장실(121, 122, 123)은 파티션(115)에 의해 복수의 저장실(121, 122, 123)로 분할될 수 있으며, 파티션(115)은 저장실(121, 122, 123) 내부에 가로로 결합되어 저장실(121, 122, 123)을 제1 저장실(121)과, 제2 저장실(122, 123)로 분할하는 제1 파티션(117)과, 제2 저장실(122, 123)에 세로로 결합되어 제2 저장실(122, 123)을 제1 하부 저장실(122)과 제2 하부 저장실(123)로 분할하는 제2 파티션(119)을 포함할 수 있다.The storage rooms 121, 122, and 123 may be divided into a plurality of storage rooms 121, 122, and 123 by a partition 115, and the partition 115 is horizontally coupled inside the storage rooms 121, 122, and 123. A first partition 117 that divides the storage compartments 121, 122, and 123 into the first storage compartment 121 and the second storage compartments 122 and 123, is vertically coupled to the second storage compartments 122 and 123, and 2 It may include a second partition 119 that divides the storage compartments 122 and 123 into a first lower storage compartment 122 and a second lower storage compartment 123.
제1 파티션(117)과 제2 파티션(119)이 결합되어 T자 형상을 갖는 파티션(115)은 저장실(121, 122, 123)을 3개의 공간으로 분할할 수 있다. 제1 파티션(117)에 의해 분할되는 제1 저장실(121)과 제2 저장실(122, 123) 중 제1 저장실(121)은 냉장실로 사용될 수 있고, 제2 저장실(122, 123)은 냉동실로 사용될 수 있다. The partition 115, which has a T-shape by combining the first partition 117 and the second partition 119, can divide the storage compartments 121, 122, and 123 into three spaces. Among the first storage compartment 121 and the second storage compartments 122 and 123 divided by the first partition 117, the first storage compartment 121 can be used as a refrigerator room, and the second storage compartments 122 and 123 can be used as a freezer compartment. can be used
상기와 같은 저장실(121, 122, 123)의 분할은 하나의 예를 든 것으로, 각각의 저장실(121, 122, 123)은 상기의 구성과 다르게 사용될 수 있다.The division of the storage compartments 121, 122, and 123 as described above is an example, and each storage compartment 121, 122, and 123 may be used differently from the configuration described above.
제1 저장실(121)과 제2 저장실(122, 123)은 각각 본체(110)에 회전 가능하게 결합되는 도어(130)에 의해 개폐될 수 있다.The first storage compartment 121 and the second storage compartments 122 and 123 can be opened and closed by a door 130 rotatably coupled to the main body 110, respectively.
도어(130)는 본체(110)에 회전 가능하게 결합되어 제1 저장실(121)을 개폐하는 한 쌍의 제1 저장실 도어(140, 150)와, 본체(110)에 회전 가능하게 결합되어 제2 저장실(122, 123)을 개폐하는 한 쌍의 제2 저장실 도어(160, 170)를 포함할 수 있다.The door 130 is rotatably coupled to the main body 110 and includes a pair of first storage compartment doors 140 and 150 that open and close the first storage compartment 121, and a pair of first storage compartment doors 140 and 150 that are rotatably coupled to the main body 110 to open and close the first storage compartment 121. It may include a pair of second storage compartment doors (160, 170) that open and close the storage compartments (122, 123).
한 쌍의 제1 저장실 도어(140, 150) 중 적어도 하나에는, 한 쌍의 제1 저장실 도어(140, 150)가 닫혔을 때 한 쌍의 제1 저장실 도어(140, 150) 사이의 갭을 커버하는 회전 바(180)가 마련될 수 있다. 회전 바(180)는 한 쌍의 제1 저장실 도어(140, 150)중 적어도 하나에 회전 가능하게 결합될 수 있다. 회전 바(180)는 내상에 형성된 회전 가이드(180)에 의해 제1 저장실 도어(140, 150) 중 회전 바(180)가 결합되는 도어의 개폐에 따라 회전하도록 가이드될 수 있다.At least one of the pair of first storage doors 140 and 150 covers the gap between the pair of first storage doors 140 and 150 when the pair of first storage doors 140 and 150 are closed. A rotating bar 180 may be provided. The rotation bar 180 may be rotatably coupled to at least one of the pair of first storage doors 140 and 150. The rotation bar 180 may be guided to rotate according to the opening and closing of the door to which the rotation bar 180 is coupled among the first storage compartment doors 140 and 150 by the rotation guide 180 formed on the inner case.
한 쌍의 제1 저장실 도어(140, 150)의 배면에는 각각 식품을 수납할 수 있는 도어선반(142, 152)이 마련될 수 있다. 한 쌍의 제2 저장실 도어(160, 170)의 배면에는 각각 식품을 수납할 수 있는 도어선반(162, 172)가 마련될 수 있다. Door shelves 142 and 152 for storing food may be provided on the back of the pair of first storage doors 140 and 150, respectively. Door shelves 162 and 172 for storing food may be provided on the back of the pair of second storage doors 160 and 170, respectively.
한편, 한 쌍의 제1 저장실 도어(140, 150)가 닫혔을 때 한 쌍의 제1 저장실 도어(140, 150) 사이의 갭(G)을 형성하는 사이드면에 이슬이 맺히는 것을 방지하도록 한 쌍의 제1 저장실 도어(140, 150) 중 적어도 하나에는 송풍팬이 장착될 수 있다. 이러한 송풍팬으로 공기가 유입되도록 인렛(147a)이 한 쌍의 제1 저장실 도어(140, 150) 중 적어도 하나의 상부(Upper portion)에 마련될 수 있다. 한 쌍의 제1 저장실 도어(140, 150) 사이의 갭(G)을 향해 기류를 배출하도록 마련되는 아웃렛이 사이드면에 마련될 수 있다.Meanwhile, when the pair of first storage doors 140 and 150 are closed, a pair of doors 140 and 150 are provided to prevent dew from forming on the side surface forming the gap G between the pair of first storage doors 140 and 150. A blowing fan may be installed on at least one of the first storage compartment doors 140 and 150. An inlet 147a may be provided in the upper portion of at least one of the pair of first storage compartment doors 140 and 150 to allow air to flow into the blowing fan. An outlet provided to discharge airflow toward the gap G between the pair of first storage doors 140 and 150 may be provided on the side surface.
한 쌍의 제1 저장실 도어(140, 150)는 제1 도어(140) 및 제1 도어(140)의 측방에 마련되는 제2 도어(150)를 포함할 수 있다. 다만, 이에 한정되는 것이 아니라 제1 도어 및 제2 도어는 한 쌍의 제2 저장실 도어(160,170)의 제1 도어(160) 및 제1 도어(160)의 측방에 마련되는 제2 도어(170)로 마련될 수 있다.The pair of first storage doors 140 and 150 may include a first door 140 and a second door 150 provided on a side of the first door 140. However, the first door and the second door are not limited to this, and the first door 160 of the pair of second storage doors 160 and 170 and the second door 170 provided on the side of the first door 160 It can be prepared by.
도 5에 도시된 바와 같이 송풍팬을 수용하는 팬 케이스 또는 가이드 덕트의 구조가 장착되는 도어의 구조에 한정되지 아니하고, 나란하게 마련되는 복수의 도어를 구비하는 냉장고에 적용될 수 있다.As shown in FIG. 5, the structure of the fan case or guide duct accommodating the blowing fan is not limited to the structure of the door on which it is mounted, and can be applied to a refrigerator having a plurality of doors provided in parallel.
이하에서, 본 발명에 대한 이해를 돕기 위하여 실시예 및 비교예를 기재한다. 다만, 하기 기재는 개시된 발명의 내용 및 효과에 관한 일 예에 해당할 뿐, 개시된 발명의 권리범위 및 효과가 반드시 이에 한정되는 것은 아니다.Below, examples and comparative examples are described to aid understanding of the present invention. However, the following description is only an example of the content and effect of the disclosed invention, and the scope and effect of the disclosed invention are not necessarily limited thereto.
{실시예}{Example}
<내덴트성 실험><Dent resistance test>
아래 표 1에는, 항복강도 및 두께에 따른 덴트 깊이를 나타냈다.Table 1 below shows the dent depth according to yield strength and thickness.
실시예1은 항복강도가 500MPa이고, 두께가 0.4mm인 스테인리스 스틸 냉연강판을 포함하는 가전기기용 외장재이다. 실시예는, C: 0.1%, Mn: 0.7%, Cr: 17.0%, 나머지 Fe 및 기타 불가피한 불순물을 포함하고, 미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함한 스테인리스 스틸 냉연강판을 적용했다.Example 1 is an exterior material for home appliances containing a cold-rolled stainless steel sheet with a yield strength of 500 MPa and a thickness of 0.4 mm. In the example, a stainless steel cold-rolled steel sheet containing C: 0.1%, Mn: 0.7%, Cr: 17.0%, the remaining Fe and other inevitable impurities, and containing ferrite and martensite or more as a microstructure was used.
비교예1은 항복강도가 320MPa이고, 두께가 0.55mm인 스테인리스 스틸 냉연강판을 포함하는 가전기기용 외장재이다. 비교예는, 일반 STS 430 강재를 적용했다.Comparative Example 1 is an exterior material for home appliances containing a cold-rolled stainless steel sheet with a yield strength of 320 MPa and a thickness of 0.55 mm. In the comparative example, general STS 430 steel was applied.
항복강도는, ASTM KS B 0802 규격에 의거하여, 상온에서, 인장시험기를 통해 시편을 20mm/min 인장 속도 하에 측정했다.The yield strength was measured at room temperature and under a tensile speed of 20 mm/min through a tensile tester, according to the ASTM KS B 0802 standard.
미세조직은, 시편의 단면을 광학현미경으로 관찰하여 측정했다.Microstructure was measured by observing the cross section of the specimen with an optical microscope.
덴트 깊이는, 시편을 Jig에 고정한 다음, 시편 중앙에 하중을 인가한 후 발생한 덴트 깊이를 측정해 나타냈다. 하중 조건은 150N, 200N 및 250N이고, 시험 속도는 2mm/min으로 수행했다. 한편, 동일 하중 조건에서 덴트 발생 깊이가 낮을수록 내덴트성이 우수하다고 평가할 수 있다.The dent depth was expressed by measuring the dent depth that occurred after fixing the specimen to the jig and applying a load to the center of the specimen. The load conditions were 150N, 200N, and 250N, and the test speed was 2mm/min. On the other hand, under the same load conditions, the lower the dent depth, the better the dent resistance.
항복강도(MPa)Yield strength (MPa) 두께(mm)Thickness (mm) 시험 하중(N)Test load (N) 덴트 깊이(mm)Dent depth (mm)
비교예1Comparative Example 1 320320 5.15.1 150150 0.390.39
200200 0.620.62
250250 0.940.94
실시예1Example 1 500500 4.04.0 150150 0.320.32
200200 0.450.45
250250 0.510.51
표 1을 참고하면, 실시예1은 두께가 얇지만 항복강도가 높아 덴트 깊이가 얕게 나타났다. 즉, 실시예1은 내덴트성이 우수했다.Referring to Table 1, Example 1 had a thin thickness but high yield strength, resulting in a shallow dent depth. That is, Example 1 had excellent dent resistance.
그러나, 비교예1은 두께가 두껍지만 항복강도가 낮아 덴트 깊이가 깊게 나타났다. 즉, 비교예1은 덴트성이 열위했다.However, although Comparative Example 1 was thick, the yield strength was low and the dent depth was deep. In other words, Comparative Example 1 had inferior dent resistance.
도 6은, 비교예1에 따른 가전기기용 외장재의 덴트 실험 결과를 나타낸 이미지이고, 도 7은, 실시예1에 따른 가전기기용 외장재의 덴트 실험 결과를 나타낸 이미지이다.Figure 6 is an image showing the results of a dent test on the exterior material for home appliances according to Comparative Example 1, and Figure 7 is an image showing the results of a dent test on the exterior material for home appliances according to Example 1.
도 6 및 도 7을 참고하면, 일 실시예에 따른 가전기기용 외장재의 내덴트성이 우수한 것을 확인할 수 있다.Referring to Figures 6 and 7, it can be seen that the exterior material for home appliances according to one embodiment has excellent dent resistance.
<성형 후 변형 시험><Deformation test after molding>
실시예 2는, 항복강도가 420MPa인 스테인리스 스틸 냉연강판을 적용한 가전기기용 외장재이고, 실시예 3은, 항복강도가 520MPa인 스테인리스 스틸 냉연강판을 적용한 가전기기용 외장재이다.Example 2 is an exterior material for home appliances using a cold-rolled stainless steel sheet with a yield strength of 420 MPa, and Example 3 is an exterior material for home appliances using a cold-rolled stainless steel sheet with a yield strength of 520 MPa.
실시예 2에 대해, 오버 벤딩 각도가 5도인 금형으로 벤딩한 후, 성형 후 변형을 측정한 결과, 벤딩 각도가 95.2도로 측정되었다. 따라서, 실시예 2는 벤딩 각도 92도 기준으로 3.2도 초과하여 변형되었으므로, 오버 벤딩 각도를 8.2도로 설정하는 것이 바람직한 것으로 확인되었다.For Example 2, after bending with a mold with an overbending angle of 5 degrees and measuring deformation after molding, the bending angle was measured to be 95.2 degrees. Therefore, since Example 2 was deformed by more than 3.2 degrees based on the bending angle of 92 degrees, it was confirmed that it was desirable to set the overbending angle to 8.2 degrees.
실시예 3에 대해, 오버 벤딩 각도가 5도인 금형으로 벤딩한 후, 성형 후 변형을 측정한 결과, 벤딩 각도가 97도로 측정되었다. 따라서, 실시예 3은 벤딩 각도 92도 기준으로 5도 초과하여 변형되었으므로, 오버 벤딩 각도를 10도로 설정하는 것이 바람직한 것으로 확인되었다.For Example 3, after bending with a mold with an overbending angle of 5 degrees and measuring deformation after molding, the bending angle was measured to be 97 degrees. Therefore, since Example 3 was deformed by more than 5 degrees based on the bending angle of 92 degrees, it was confirmed that it was desirable to set the overbending angle to 10 degrees.
따라서, 항복강도 420 내지 520MPa인 스테인리스 스틸 냉연강판을 적용할 경우, 오버 벤딩 각도를 8 내지 10도로 설정하여 성형하는 것이 바람직한 것으로 확인되었다.Therefore, when applying a stainless steel cold-rolled steel sheet with a yield strength of 420 to 520 MPa, it was confirmed that it is desirable to form the overbending angle at 8 to 10 degrees.
개시된 발명의 일 실시예에 의하면, 두께가 얇은 스테인리스 스틸 냉연강판을 적용함으로써 원재료 사용량을 절감하고, 철강 생산 시 발생하는 탄소 배출량을 줄여 친환경에도 이바지할 수 있다. 또한, 개시된 발명의 일 실시예에 의하면, 두께가 얇은 스테인리스 스틸 냉연강판을 적용함에도 불구하고, 내덴트성이 향상되고, 성형성이 우수한 가전기기용 외장재 및 이를 포함하는 냉장고를 제공할 수 있다.According to one embodiment of the disclosed invention, by applying a thin-thick stainless steel cold-rolled steel sheet, the amount of raw material used can be reduced and carbon emissions generated during steel production can be reduced, thereby contributing to the environment. In addition, according to one embodiment of the disclosed invention, an exterior material for home appliances with improved dent resistance and excellent formability, despite using a thin cold-rolled stainless steel sheet, and a refrigerator including the same can be provided.
일 실시예에 의하면, 고강도 스테인리스 스틸 냉연강판을 적용하여, 내덴트성이 향상된 가전기기용 외장재 및 이를 포함하는 냉장고를 제공할 수 있다. 또한, 일 실시예에 의하면, 최적의 연신율 및 오버 벤딩 각도를 도출하여 성형성이 향상된 가전기기용 외장재 및 이를 포함하는 냉장고를 제공할 수 있다.According to one embodiment, by applying a high-strength stainless steel cold-rolled steel sheet, an exterior material for home appliances with improved dent resistance and a refrigerator including the same can be provided. In addition, according to one embodiment, it is possible to provide an exterior material for home appliances with improved formability by deriving an optimal elongation and over-bending angle, and a refrigerator including the same.

Claims (15)

  1. 스테인리스 스틸 냉연강판을 포함하고,Contains stainless steel cold rolled steel sheet,
    상기 스테인리스 스틸 냉연강판은,The stainless steel cold rolled steel sheet,
    중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함 하고,In weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, including the remaining Fe and other inevitable impurities,
    미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함하고,The microstructure includes ferrite and martensite structures,
    두께가 0.3mm 이상 0.5mm 이하인, 가전기기용 외장재.Exterior material for home appliances with a thickness of 0.3 mm or more and 0.5 mm or less.
  2. 제1항에 있어서,According to paragraph 1,
    상기 스테인리스 스틸 냉연강판 표면에 형성되는 헤어라인을 더 포함하는, 가전기기용 외장재.An exterior material for home appliances, further comprising a hairline formed on the surface of the stainless steel cold rolled steel sheet.
  3. 제1항에 있어서,According to paragraph 1,
    상기 스테인리스 스틸 냉연강판 상부에 마련되는 도장층을 더 포함하는, 가전기기용 외장재.An exterior material for home appliances, further comprising a coating layer provided on the stainless steel cold rolled steel sheet.
  4. 제1항에 있어서,According to paragraph 1,
    상기 스테인리스 스틸 냉연강판은,The stainless steel cold rolled steel sheet,
    항복강도가 420 내지 520MPa인, 가전기기용 외장재.An exterior material for home appliances with a yield strength of 420 to 520 MPa.
  5. 제1항에 있어서,According to paragraph 1,
    상기 스테인리스 스틸 냉연강판은,The stainless steel cold rolled steel sheet,
    연신율이 20 내지 30%인, 가전기기용 외장재.Exterior material for home appliances with an elongation of 20 to 30%.
  6. 제1항에 있어서,According to paragraph 1,
    상기 스테인리스 스틸 냉연강판은,The stainless steel cold rolled steel sheet,
    덴트 깊이가 0.5mm 이하인, 가전기기용 외장재.Exterior material for home appliances with a dent depth of 0.5 mm or less.
  7. 제1항에 있어서,According to paragraph 1,
    벤딩부의 벤딩 각도가 90 내지 94도인, 가전기기용 외장재.An exterior material for home appliances in which the bending portion has a bending angle of 90 to 94 degrees.
  8. 중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함 하고,In weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, including the remaining Fe and other inevitable impurities,
    미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함하고,The microstructure includes ferrite and martensite structures,
    두께가 0.3mm 이상 0.5mm 이하인, 스테인리스 스틸 냉연강판을 준비하는 단계; 및Preparing a stainless steel cold-rolled steel sheet with a thickness of 0.3 mm or more and 0.5 mm or less; and
    상기 스테인리스 스틸 냉연강판을 성형하는 단계를 포함하는, 가전기기용 외장재 제조방법.A method of manufacturing an exterior material for home appliances, comprising the step of forming the stainless steel cold-rolled steel sheet.
  9. 제8항에 있어서,According to clause 8,
    상기 스테인리스 스틸 냉연강판 표면에 헤어라인을 형성시키는 헤어라인 형성 단계를 더 포함하는, 가전기기용 외장재 제조방법.A method of manufacturing an exterior material for home appliances, further comprising a hairline forming step of forming a hairline on the surface of the stainless steel cold rolled steel sheet.
  10. 제8항에 있어서,According to clause 8,
    상기 스테인리스 스틸 냉연강판 상부에 도장층을 마련하는 도장 단계를 더 포함하는, 가전기기용 외장재 제조방법.A method of manufacturing an exterior material for home appliances, further comprising a painting step of providing a painting layer on the stainless steel cold rolled steel sheet.
  11. 제8항에 있어서,According to clause 8,
    상기 성형하는 단계에서,In the molding step,
    오버 벤딩 각도는 8 내지 10도인, 가전기기용 외장재 제조방법.A method of manufacturing exterior materials for home appliances, wherein the overbending angle is 8 to 10 degrees.
  12. 제8항에 있어서,According to clause 8,
    상기 스테인리스 스틸 냉연강판은,The stainless steel cold rolled steel sheet,
    덴트 깊이가 0.5mm 이하인, 가전기기용 외장재 제조방법.Method for manufacturing exterior materials for home appliances with a dent depth of 0.5 mm or less.
  13. 본체;main body;
    상기 본체 내부에 마련되는 저장실; 및a storage compartment provided inside the main body; and
    상기 저장실의 적어도 일부를 개폐하도록 상기 본체에 회전 가능하게 결합되는 도어를 포함하고,A door rotatably coupled to the main body to open and close at least a portion of the storage compartment,
    상기 도어는,The door is
    가전기기용 외장재를 포함하고,Including exterior materials for home appliances,
    상기 가전기기용 외장재는,The exterior material for the home appliance is,
    스테인리스 스틸 냉연강판을 포함하고,Contains stainless steel cold rolled steel sheet,
    상기 스테인리스 스틸 냉연강판은,The stainless steel cold rolled steel sheet,
    중량%로, C: 0% 초과 0.12% 이하, Mn: 0% 초과 1.0% 이하, Cr: 16.0% 초과 18.0 % 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함 하고,In weight percent, C: more than 0% and less than 0.12%, Mn: more than 0% and less than 1.0%, Cr: more than 16.0% and less than 18.0%, including the remaining Fe and other inevitable impurities,
    미세조직으로, 페라이트와 마르텐사이트 이상 조직을 포함하고,The microstructure includes ferrite and martensite structures,
    두께가 0.3mm 이상 0.5mm 이하인, 냉장고.Refrigerator with a thickness of 0.3 mm or more and 0.5 mm or less.
  14. 제13항에 있어서,According to clause 13,
    상기 가전기기용 외장재는,The exterior material for the home appliance is,
    스테인리스 스틸 냉연강판 표면에 형성되는 헤어라인을 더 포함하고,Further comprising a hairline formed on the surface of the stainless steel cold rolled steel sheet,
    스테인리스 스틸 냉연강판 상부에 마련되는 도장층을 더 포함하는, 냉장고.A refrigerator further comprising a coating layer provided on an upper portion of a stainless steel cold-rolled steel sheet.
  15. 제13항에 있어서,According to clause 13,
    상기 가전기기용 외장재는,The exterior material for the home appliance is,
    벤딩부의 벤딩 각도가 90 내지 94도인, 냉장고.A refrigerator having a bending angle of 90 to 94 degrees.
PCT/KR2023/010982 2022-09-14 2023-07-27 Exterior material for home appliance and refrigerator comprising same WO2024058413A1 (en)

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KR1020220134488A KR20240037120A (en) 2022-09-14 2022-10-18 Exterior material for home appliance and refrigerator comprising same
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08319519A (en) * 1995-05-24 1996-12-03 Nisshin Steel Co Ltd Production of high strength dual-phase stainless steel strip or sheet
JPH11152550A (en) * 1997-11-17 1999-06-08 Nisshin Steel Co Ltd Mirror-finished dual-phase stainless steel sheet excellent in scratch resistance, and its production
JP2003231954A (en) * 2001-12-06 2003-08-19 Nippon Steel Corp Ferritic stainless steel plate with excellent press formability and workability and its manufacturing process
KR20130009474A (en) * 2011-07-15 2013-01-23 주식회사 포스코 Martensitic stainless steel with high carbon content and manufacturing method of the same
WO2015133433A1 (en) * 2014-03-03 2015-09-11 新日鐵住金ステンレス株式会社 Ferritic/austenitic two-phase stainless-steel sheet with excellent polishability and process for producing same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08319519A (en) * 1995-05-24 1996-12-03 Nisshin Steel Co Ltd Production of high strength dual-phase stainless steel strip or sheet
JPH11152550A (en) * 1997-11-17 1999-06-08 Nisshin Steel Co Ltd Mirror-finished dual-phase stainless steel sheet excellent in scratch resistance, and its production
JP2003231954A (en) * 2001-12-06 2003-08-19 Nippon Steel Corp Ferritic stainless steel plate with excellent press formability and workability and its manufacturing process
KR20130009474A (en) * 2011-07-15 2013-01-23 주식회사 포스코 Martensitic stainless steel with high carbon content and manufacturing method of the same
WO2015133433A1 (en) * 2014-03-03 2015-09-11 新日鐵住金ステンレス株式会社 Ferritic/austenitic two-phase stainless-steel sheet with excellent polishability and process for producing same

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