KR100598610B1 - Method for obtaining traffic information by using call data record of mobile - Google Patents
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- KR100598610B1 KR100598610B1 KR1020040085069A KR20040085069A KR100598610B1 KR 100598610 B1 KR100598610 B1 KR 100598610B1 KR 1020040085069 A KR1020040085069 A KR 1020040085069A KR 20040085069 A KR20040085069 A KR 20040085069A KR 100598610 B1 KR100598610 B1 KR 100598610B1
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- 238000000034 method Methods 0.000 title abstract description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 52
- 239000010935 stainless steel Substances 0.000 claims abstract description 51
- 238000005520 cutting process Methods 0.000 claims abstract description 38
- 238000005260 corrosion Methods 0.000 claims abstract description 35
- 230000007797 corrosion Effects 0.000 claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 claims abstract description 32
- 238000005097 cold rolling Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 22
- 238000005498 polishing Methods 0.000 claims description 11
- 238000005098 hot rolling Methods 0.000 abstract description 7
- 230000003746 surface roughness Effects 0.000 abstract description 6
- 229910001256 stainless steel alloy Inorganic materials 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 13
- 239000000047 product Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 210000004243 sweat Anatomy 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
본 발명은 초고내식 쾌삭 스테인리스강 연마평재 제조방법에 관한 것으로, 쾌삭 스테인리스 합금인 316F를 최적화된 연속 냉간압연으로 정밀 냉각 압연후, 냉간압연에 따른 응력을 해소시키기 위한 적절한 용체화 열처리를 수행하여 생산공정이 간단해져서 생산기간이 단축되며, 열간압연 공정보다 생산 원가도 절감되므로 소량 다품종 생산에 유리한 고 내식성이 요구되는 시계 케이스 부품등과 같은 정밀부품 소재로 사용할 수 있는 가공성, 내식성 및 표면조도가 우수한 초고내식 쾌삭 스테인리스강 연마평재를 제조할 수 있는 것이다.The present invention relates to a manufacturing method of ultra-high corrosion-resistant free-cutting stainless steel abrasive flat plate, and precisely cold-rolled free-rolled stainless steel alloy 316F with optimized continuous cold rolling, and then produced by performing an appropriate solution heat treatment to relieve the stress caused by cold rolling. The process is simplified and the production period is shortened, and the production cost is also reduced compared to the hot rolling process. It has excellent workability, corrosion resistance and surface roughness that can be used for precision parts such as watch case parts, which require high corrosion resistance. It is possible to manufacture ultra-high corrosion resistant free-cutting stainless steel abrasive plate.
스테인리스강, 쾌삭, 내식성, 냉간압연, 용체화열처리Stainless steel, free cutting, corrosion resistance, cold rolling, heat treatment
Description
도 1은 종래의 스테인리스강 판재의 생산공정도.1 is a production process of the conventional stainless steel sheet.
도 2는 본발명에 의한 스테인리스강 판재의 생산공도.2 is a production process of the stainless steel sheet according to the present invention.
도 3은 본 발명의 실시예에 의한 판재의 압연공정을 도시한 그래프.Figure 3 is a graph showing the rolling process of the plate according to an embodiment of the present invention.
도 4는 본 발명의 초고내식 쾌삭 스테인리스강 연마평재와 비교제품들의 절삭성을 나타낸 그래프. Figure 4 is a graph showing the machinability of the ultra-high corrosion resistance free cutting stainless steel abrasive flat material and comparative products of the present invention.
삭제delete
* 도면의 주요부분에 대한 부호의 설명 * Explanation of symbols on the main parts of the drawings
11 : 연속 냉간압연단계 12 : 용체화 열처리단계11: continuous cold rolling step 12: solution heat treatment step
13 : 절단 및 연마단계 13: cutting and polishing step
본 발명은 초고내식 쾌삭 스테인리스강 연마평재 제조방법에 관한 것으로서, 쾌삭 스테인리스 합금인 316F 또는 316LF을 최적화된 연속 냉간압연으로 정밀 냉간 압연후 적정 용체화 열처리만으로 고 내식성이 요구되는 소재인 시계 케이스, 베젤, 백 등 시계 관련 부품과 같은 정밀부품 소재로 사용할 수 있는 가공성, 내식성 및 표면조도가 우수한 초고내식 쾌삭 스테인리스강의 연마평재 제조방법에 관한 것이다. The present invention relates to a manufacturing method of ultra-high corrosion-resistant free-cutting stainless steel abrasive flat plate, watch case, bezel is a material that requires high corrosion resistance only by precise cold rolling after precision cold rolling of 316F or 316LF, a free-cutting stainless steel alloy optimized The present invention relates to a method for manufacturing abrasive flat materials of ultra-high corrosion-resistant free-cutting stainless steel having excellent workability, corrosion resistance, and surface roughness, which can be used as precision parts such as watches and watches.
일반적으로 시계 케이스, 베젤, 백 등 시계 관련 부품은 정밀도, 가공성, 절삭성 및 내식성이 요구되는 정밀부품으로 소재의 선택, 소재에 따른 최적의 압연공정, 열처리, 표면처리 공정에서 최적의 공정제어 기술개발 없이 그 정밀도를 만족시킬 수 없었다. In general, watch-related parts such as watch cases, bezels, and bags are precision parts that require precision, processability, cutting and corrosion resistance, and develop optimal process control technology in the selection of materials, optimal rolling process, heat treatment, and surface treatment process. Without that precision could not be satisfied.
특히, 이와 같은 시계의 케이스용 부품으로 내식성이 우수한 스테인리스강 압연 판재를 사용하고 있는데, 제작과정 중에 드릴링(drilling) 및 가공 공정이 적용되므로 소재는 스테인리스강의 절삭성 향상을 위해 쾌삭성이 함께 요구되고 있다. In particular, a stainless steel rolled sheet material having excellent corrosion resistance is used as a case part of such a watch. Since a drilling and a machining process are applied during the manufacturing process, the material is required to have high machinability to improve the machinability of stainless steel.
그러나 기존 시계 케이스용 소재로 널리 사용되는 범용 스테인리스 강인 SUS 304는 표면조도가 나쁘며 가공성이 우수하지 못한 특성이 있어서 가공후 표면의 요철이 심하고 정밀도가 떨어지고, 드릴 가공시 드릴 마모가 심하여 생산원가 절감이 어려우며, 드릴의 교체 주기도 짧아서 생산성이 낮은 문제점이 제기되어 왔다. However, SUS 304, a general-purpose stainless steel widely used as a material for the existing watch case, has poor surface roughness and poor workability. Therefore, roughness and precision of the surface after processing are severe, and drill wear is severe when drilling, making it difficult to reduce production costs. In addition, the replacement cycle of the drill is also short, and the problem of low productivity has been raised.
이와 같은 스테인리스강의 특성을 보완하기 위하여 시계 케이스 부품용 쾌삭 스테인리스강은 마르텐사이트나 페라이트계 스테인리스강보다 내식성이 우수한 오스테나이트계 스테인리스강을 적용하여 사용되고 있으며 일반적으로 S, Se, Pb등 쾌삭성 원소를 첨가하여 쾌삭성을 강화시키고 있다. In order to supplement the characteristics of the stainless steel, the free-cutting stainless steel for watch case parts is applied by using austenitic stainless steel, which has better corrosion resistance than martensite or ferritic stainless steel, and generally uses free-cutting elements such as S, Se, and Pb. It adds and enhances free machinability.
개발된 오스테나이트계 쾌삭 스테인레스 강의 합금으로는 SUS303 Se, 303F, 303Pb, 316F 등이 있으며 현재 고급시계의 경우 국내에선 일본금속사의 NTKF2, 일본 스테인레스사의 NARW2 합금판재를 주로 사용하고 있다. SUS303 Se, 303F, 303Pb, and 316F alloys of the austenitic free cutting stainless steel are developed. Currently, high quality watches mainly use NTKF2 from Japan Metal and NARW2 from Japan.
도 1은 종래의 시계 케이스용 스테인리스강 판재의 생산공정을 설명하기 위한 공정도로서 시계 케이스용 스테인리스 판재는 열간압연단계(1)와 용체화 열처리단계(2)를 수행하여 소재의 특성을 향상시킨 후 다시 코일로 감는 열연코일단계(3)를 거쳐 작업시 필요한 소정의 크기로 절단하는 절단단계(4)를 통해 제조하였다.1 is a process chart for explaining the production process of the conventional stainless steel plate for watch case, the stainless steel plate for watch case is subjected to the hot rolling step (1) and solution heat treatment step (2) to improve the properties of the material and then coiled again Furnace winding was prepared through a cutting step (4) of cutting to a predetermined size required during the work through the hot rolled coil step (3).
즉, 시계 케이스 부품용 스테인리스강 판재는 열간압연단계(1)와 용체화 열처리단계(2)를 수회 반복하여 스테인리스강의 특성을 향상시키고, 열연코일로 권취하는 열연코일단계(3)를 거쳐 최종적으로는 부품 소재를 생산하기 위해서 소정의 크기로 절단하는 절단단계(4)에서 가로 1m, 세로 2m의 열연 스테인리스 판재로 절단하고, 다시 프레스를 위해 필요에 따라 가로 30 ~ 60 mm 로 절단한 후, 부품 형상으로 프레스하여, 소재를 제작한 후 연마공정를 거쳐 완성하였다. That is, the stainless steel sheet for watch case parts is repeatedly subjected to the hot rolling step (1) and the solution heat treatment step (2) several times to improve the characteristics of the stainless steel, and finally through the hot rolled coil step (3) wound with a hot rolled coil. In the cutting step (4) of cutting to a predetermined size in order to produce the part material is cut into hot rolled stainless steel plate of 1m long and 2m long, and then cut to 30 ~ 60 mm horizontally as necessary for press, Pressed into a shape, a raw material was produced and then subjected to a polishing process.
하지만, 이와 같은 쾌삭 스테인리스강 소재 박판은 열간압연공정에 따른 압연량 제어, 압연횟수 및 두께 변화에 따라 조직과 기계적 특성 변화가 크기 때문에 최적 압연 공정 제어 기술 개발에 많은 어려움이 있고, 특히 공정지연에 따라 생산기간이 길고, 생산효율이 낮아 생산원가가 높은 문제점이 있다. However, such high-cutting stainless steel sheet is difficult to develop the optimum rolling process control technology because of the large change in structure and mechanical properties according to the rolling amount control, the number of rolling and the thickness change according to the hot rolling process. Therefore, the production period is long, the production efficiency is low, there is a problem that the production cost is high.
즉, 열간압연 공정은 냉간압연 공정에 비해 생산비용이 높은 단점이 있어서 생산원가를 상승시키는 문제점이었고, 공정이 냉간압연에 비해 복잡하고 생산기간도 더 오래 소요되므로 소량 다품종 생산에 적합하지 않은 문제점이 있다. In other words, the hot rolling process has a disadvantage in that the production cost is higher than that of the cold rolling process, thereby increasing the production cost, and the process is not suitable for producing small quantities of various products because the process is complicated and takes longer to produce than the cold rolling process. have.
본 발명은 상기와 같은 문제점을 해결하기 위해 창작된 것으로서, 본 발명의 목적은 SUS 316F 합금을 이용하여 쾌삭성을 구비하면서도, 냉간압연으로 내부 조직이 치밀하게 되어 가공성이 향상되며, 냉간압연에 따른 응력을 해소시키기 위한 적절한 용체화 열처리를 수행하여 생산공정이 간단해져서 생산기간이 단축되며, 열간압연 공정보다 생산 원가도 절감되면서 소재 품질도 우수하게 되어 소량 다품종 생산에 유리한 초고내식 쾌삭 스테인리스강 연마평재 제조방법을 제공함에 있다. The present invention has been made to solve the above problems, the object of the present invention is to provide a high machinability using SUS 316F alloy, the internal structure is densified by cold rolling to improve the workability, according to cold rolling Ultra-corrosion free-cutting stainless steel abrasive flat material that is suitable for production of small quantity of products by improving solution quality by shortening the production process by performing proper solution heat treatment to relieve stress and reducing production cost than hot rolling process. To provide a manufacturing method.
상기와 같은 목적을 실현하기 위한 본 발명인 초고내식 쾌삭 스테인리스강의 연마평재 제조방법은 스테인레스강 판재를 연속적으로 수회간 냉간압연하는 냉간압연단계와, 냉간압연된 스테인레스강 판재를 용체화열처리하는 용체화열처리단계와, 용체화열처리가 완료된 스테인레스강을 소정크기로 절단하고, 연마하는 절단 및 연마단계를 통해 초고내식 스테인리스강 연마평재를 제조하는 것을 특징으로 한다. In order to achieve the above object, the present invention provides a method for manufacturing ultra-high corrosion-resistant free-cutting stainless steel abrasive flat plate comprising a cold rolling step of continuously rolling a stainless steel sheet several times, and a solution heat treatment for heat treatment of the cold-rolled stainless steel plate. And the ultra-corrosion resistant stainless steel polishing flat material is prepared by cutting and polishing the stainless steel that has been subjected to the solution heat treatment to a predetermined size, and polishing and polishing.
특히, 냉간압연시 10 ~ 16% 의 압연률로 압연이 이루어지도록 하고, 상기 스테인레스강은 SUS316F 쾌삭 스테인레스강이 바람직하고, 6 내지 8회 연속 냉간압연을 수행하는 것이 바람직하다. In particular, the cold rolling is to be carried out at a rolling rate of 10 to 16%, the stainless steel is preferably SUS316F free-cutting stainless steel, it is preferable to perform 6 to 8 consecutive cold rolling.
또한, 상기 초고내식 스테인리스강 연마평재를 제조방법에 의해 생산되는 초고내식 스테인리스강 연마평재를 제공하는 것을 특징으로 한다.In addition, the ultra-high corrosion-resistant stainless steel abrasive plate is characterized by providing an ultra-high corrosion-resistant stainless steel abrasive plate produced by the manufacturing method.
이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 설명한다. 또한 본 실시예는 본 발명의 권리범위를 한정하는 것은 아니고, 단지 예시로 제시된 것이다. Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, this embodiment is not intended to limit the scope of the present invention, but is presented by way of example only.
도 2는 본 발명에 의한 초고내식 쾌삭 스테인리스강 연마평재 제조방법를 설명하기 위한 공정도이다. Figure 2 is a process chart for explaining the ultra-high corrosion resistance free cutting stainless steel abrasive flat material manufacturing method according to the present invention.
즉, 본 발명의 초고내식 쾌삭스테인리스강 연마평재를 제조하기 위해서는 먼저 스테인레스강 판재를 연속적으로 수회간 냉간압연하는 연속 냉간압연단계(11)와, 상기 연속 냉간압연단계(11)에서 냉간압연된 스테인레스강 판재를 적정 용체화열처리하는 용체화열처리단계(12)와, 상기 용체화열처리단계(12)에서 용체화열처리가 완료된 스테인레스강을 소정크기로 절단하고, 연마하는 절단 및 연마단계(13)를 통해 초고내식 스테인리스강 연마평재를 제조한다. That is, in order to manufacture the ultra-high corrosion-resistant free-cutting stainless steel abrasive flat plate of the present invention, first, a continuous cold rolling step (11) of continuously cold rolling stainless steel plate several times, and the cold rolled stainless in the continuous cold rolling step (11) The solution
도3은 본 발명의 실시예에 의한 압연공정을 그래프도 도시한 도면으로 두께 6.65mm, 폭 50mm 및 중량 50kg의 쾌삭스테인리스 합금인 SUS316LF 판재를 8회의 연속 냉간압연을 통해 두께 6.5mm(t)에서 두께 1.23mm 정도의 판재를 얻은 결과를 도시한 그래프이다. Figure 3 is a diagram showing a rolling process according to an embodiment of the present invention in a thickness of 6.65mm, width 50mm and weight 50kg SUS316LF sheet material of free cutting stainless steel alloy at a thickness of 6.5mm (t) through eight consecutive cold rolling It is a graph showing the result of obtaining a plate having a thickness of about 1.23 mm.
압연양은 냉간 압연기의 압연양 게이지(gauge)값을 통해 조절하는 것으로 도2의 그래프에서 압연회차에 대한 게이지값과 판재의 두께를 도시하였다.The amount of rolling is controlled by a rolling amount gauge (gauge) value of the cold rolling mill in the graph of Figure 2 shows the gauge value and the thickness of the plate for the rolling cycle.
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도3은 본 발명에 의한 압연과정을 그래프도 도시한 도면으로 두께 6.65mm, 폭 50mm 및 중량 50kg의 쾌삭스테인리스 합금인 SUS 316F 판재를 8회의 연속 냉간압연을 통해 두께 6.5mm(t)에서 두께 1.23mm 정도의 판재를 얻은 결과를 도시한 그래프이다. Figure 3 is a graph showing the rolling process according to the present invention in a thickness of 6.23mm, 50mm in width and 50kg in weight free cutting stainless steel alloy SUS 316F sheet through eight consecutive cold rolling thickness of 6.5mm (t) at thickness 1.23 It is a graph showing the result of obtaining a plate of about mm.
압연양은 냉간 압연기의 압연양 게이지(gauge)값을 통해 조절하는 것으로 도3의 그래프에서도 압연회차에 대한 게이지값과 판재의 두께를 도시하였다.The amount of rolling is controlled by the gauge of the rolling amount of the cold rolling mill (gauge) value in the graph of Figure 3 also shows the gauge value and the thickness of the plate for the rolling cycle.
도3의 그래프에 나타내었듯이 판재를 압연시마다, 압연 전후의 판재 두께가 10 ~ 16% 의 압연률로 압연되었으며, 이에 따라 압연양이 조절되도록 하였다. As shown in the graph of FIG. 3, each time the sheet was rolled, the thickness of the sheet before and after rolling was rolled at a rolling rate of 10 to 16%, thereby adjusting the amount of rolling.
이는 연마공정까지 완료된 이후 최종적으로 1.22~1.23mm 정도의 박판 판재에서 판재표면에 손상이 없는 한계값을 얻은 결과이며, 이와 같은 값을 벗어나게 되면, 두께가 균일하면서 크랙(crack)이 없는 제품을 얻을 수 없었다. This is the result of getting the limit value without damage to the plate surface from the thin plate of about 1.22 ~ 1.23mm after completion of the polishing process. If it is out of this value, it will get the product with uniform thickness and no crack. Could not.
이 냉간압연에서 1차 압연은 게이지 값을 6 ~ 7.5로 하여 5.6 ~ 5.65mm 두께의 판재를 얻게 되고, 2차 압연은 게이지 값을 7.7 ~ 9.2로 하여 4.95 ~ 5.0mm 두께의 판재를 얻게 되며, 3차 압연은 게이지 값을 9.2 ~ 10.8로 하여 4.2 ~ 4.35mm 두께의 판재를 얻게 되고, 4차 압연은 게이지 값을 10.5 ~ 11로 하여 3.55 ~ 3.75mm 두께의 판재를 얻게 된다. 5차 압연은 게이지 값을 3.2~5.2로 하여 2.7 ~ 3.1mm 두께를 얻게 되며, 6차 압연에서 게이지 값을 5.5 ~ 6.5로 하여 2.1 ~ 2.3mm 두께를 얻게 된다. 그리고 7차 압연에서 게이지 값을 6.5 ~ 7.5로 하여 1.68 ~ 1.75mm의 두께를 얻게 되고, 8차 압연에서 게이지 값을 4.4 ~ 5.2으로 하여 1.22~ 1.23mm의 두께를 갖는 판재를 얻게 된 것이다. 즉, 압연 게이지의 값이 1차에서 4차 압연시까지 증가하다가 5차 압연에서 급격히 감소하고 다시 증가하다가 8차 압 연에서 다시 감소하는 특성이 나타나는 것을 알 수 있다. In this cold rolling, the primary rolling obtains a sheet thickness of 5.6 to 5.65 mm with a gauge value of 6 to 7.5, and the secondary rolling obtains a sheet thickness of 4.95 to 5.0 mm with a gauge value of 7.7 to 9.2. In the third rolling, the gauge value is set to 9.2 to 10.8 to obtain a plate of 4.2 to 4.35mm thickness, and the fourth rolling is to obtain a plate of 3.55 to 3.75mm in thickness of the gauge value of 10.5 to 11. The fifth rolling has a thickness of 2.7 to 3.1mm with gauge values of 3.2 to 5.2, and the thickness of 2.1 to 2.3mm with a gauge of 5.5 to 6.5 for the sixth rolling. In the seventh rolling, a gauge value of 6.5 to 7.5 was obtained to obtain a thickness of 1.68 to 1.75 mm, and in the eighth rolling, a gauge having a thickness of 1.22 to 1.23 mm was obtained using the gauge value of 4.4 to 5.2. That is, it can be seen that the value of the rolling gauge increases from the first to the fourth rolling, decreases rapidly in the fifth rolling, increases again, and then decreases again in the eighth rolling.
냉간압연 후 각 두께별 판재의 압연방향의 단면 미세조직을 관찰해 보면, 압연량이 증가할수록 메탈 플로우(metal flow)가 선명해지면서 그 간격이 점점 줄어드는 것을 볼 수 있었다. 또한 결정립들이 압연방향으로 이방성이 증가하는 것도 관찰할 수 있다. 인장강도는 압연율이 증가할수록 증가하고 항복강도는 증가하는 경향을 보였지만, 5.15~4.15mm에서 감소하는 경향을 나타내다가 3.65mm에서 다시 증가하는 경향을 보인다. 이는 압연에 의한 가공경화로 전위의 밀도가 증가하고 결정립계와 석출물에 의해 이동이 힘들어지지만 전위의 중첩량이 증가함에 따라 5.15~4.15mm의 가공경화를 극복함으로서 전위들이 결정립계와 석출물을 통과하게 되는 것에서 비롯되는 현상이다. 그러나 압연량이 더욱 증가하면 가공 경화의 증가와 함께 전위의 발생량이 증가하여 전위들이 뒤엉키게 되어 다시 전위의 이동이 더욱 힘들어지게 된다. 이와 같은 현상은 금속에서 일반적으로 알려진 변형 시효(strain aging)로 설명되는 것이다.
그리고 참고로 도 4는 본 발명의 초고내식 쾌삭 스테인리스강 연마평재와 비교제품들의 절삭성을 나타낸 그래프이다.Observing the cross-sectional microstructure in the rolling direction of the plate for each thickness after cold rolling, as the rolling amount increased, the metal flow became clear and the gap gradually decreased. It can also be observed that grains increase anisotropy in the rolling direction. Tensile strength increased with increasing rolling rate and yield strength increased, but decreased from 5.15 ~ 4.15mm and then increased again at 3.65mm. This is due to the increase in the dislocation density due to the work hardening by rolling and the movement of the dislocation by the grain boundaries and precipitates. It is a phenomenon. However, when the rolling amount is further increased, the amount of dislocations increases with increasing work hardening, and the dislocations are entangled, which makes it more difficult to move the dislocations again. This phenomenon is explained by strain aging commonly known in metals.
And for reference, Figure 4 is a graph showing the machinability of the ultra-high corrosion resistance free cutting stainless steel abrasive flat material and comparative products of the present invention.
상기와 같이 냉간압연된 압연판재를 경도시험, 인장시험을 실시하였으며, 모두 기준을 충족하는 결과를 얻을 수 있었다. As described above, the cold rolled sheet was subjected to a hardness test and a tensile test, and all of the results were satisfied.
냉간압연 판재의 특성을 시험하기 위한 냉간압연 판재의 냉간압연 공정은 다음 [표 1]과 같다. The cold rolling process of the cold rolled sheet to test the characteristics of the cold rolled sheet is shown in Table 1 below.
[표 1]TABLE 1
상기 공정을 거친 냉간 압연판재에 대한 경도값은 아래 [표 2]에 나타난 바와 같음을 알 수 있다. It can be seen that the hardness value for the cold rolled sheet material subjected to the above process is as shown in Table 2 below.
[표 2]TABLE 2
아래의 [표 3]은 상기 냉간압연 판재의 특성을 시험하기 위한 판재의 냉간압연 후 각각의 두께에서의 인장강도를 나타낸 표이다. Table 3 below is a table showing the tensile strength at each thickness after the cold rolling of the plate for testing the properties of the cold rolled sheet.
[표 3]TABLE 3
상술한 바와 같은 방법에 의해 냉간압연된 스테인리스 판재는 냉간압연에 의해 생성되는 응력을 해소시키는 것이 매우 중요하다. 따라서 적당한 용체화 열처리 공정을 거쳐야지만 시계 케이스와 같은 정밀 부품 소재로서 요구되는 물성치를 만족할 수 있기 때문이다. In the stainless steel sheet cold rolled by the method as described above, it is very important to solve the stress generated by cold rolling. Therefore, it is necessary to pass a proper solution heat treatment process, but it is possible to satisfy the physical properties required as a precision part material such as a watch case.
용체화 열처리 조건은 미세조직의 재결정과 용체화 열처리 판재의 기계적 특성 및 부식 실험, 절삭성 시험으로 연구하였다. The solution heat treatment conditions were studied by recrystallization of microstructure, mechanical properties, solution corrosion test, and cutting test.
용체화 열처리는 스테인레스강의 표준온도 범위에서 온도를 설정하였다. The solution heat treatment set the temperature in the standard temperature range of stainless steel.
970, 1000, 1030, 1060, 1090℃에서 30, 60, 90, 120분 간 용체화 열처리를 하였다. 그 결과 재결정 조직 기준으로 1030℃/120분, 1060℃/90분 이 가장 우수한 재결정 조직을 보이는 것을 알 수 있었다. The solution heat treatment was performed for 30, 60, 90, and 120 minutes at 970, 1000, 1030, 1060, and 1090 ° C. As a result, it was found that 1030 ° C / 120 minutes and 1060 ° C / 90 minutes showed the best recrystallization structure based on the recrystallization structure.
또한, 상기와 같은 용체화 열처리 판재 중 1030℃/120분과 1060℃/90분의 두 가지 조건에서 경도값 HRB 80 ~ 85 kgf/mm2를 만족하는 조건은 1030℃/120분이었다. 따라서 적정 열처리 조건은 1030℃/120분이다. In addition, the conditions satisfying the hardness values HRB 80 to 85 kgf / mm 2 at two conditions of 1030 ° C./120 minutes and 1060 ° C./90 minutes in the solution heat treatment sheet material were 1030 ° C./120 minutes. Therefore, the appropriate heat treatment condition is 1030 ℃ / 120 minutes.
이 1030℃/120분 용체화 열처리 판재의 인장 강도는 시계 케이스용 판재의 요구특성인 55~60 kgf/mm2를 만족하는 것으로 나타났다. The tensile strength of this 1030 ° C / 120 min solution heat treatment plate was found to satisfy 55 ~ 60 kgf / mm 2 , which is the required characteristic of watch case plate.
다음 [표 4]와 [표 5]는 상기 냉간압연 판재의 특성을 시험하기 위한 판재를 용체화 열처리 및 표면 연마 후의 각 두께별 판재의 경도값과 인장강도이다. [Table 4] and [Table 5] are the hardness values and tensile strengths of the plates for each thickness after solution heat treatment and surface polishing of the sheet for testing the properties of the cold rolled sheet.
[표 4]TABLE 4
[표 5]TABLE 5
용체화 열처리가 이루어진 판재의 절삭성 요구값은 100,000N인데, 시험결과에서 메인 포스(main force)의 최대(max)값이 80,000 으로 요구값을 만족하고 있다. 이는 도5의 절삭성 비교 그래프를 도시한 도면에 나타내었다. The required value for machinability of the plate material subjected to the solution heat treatment was 100,000 N. The test result satisfies the required value with a maximum value of main force of 80,000. This is shown in the figure showing the graph of cutting machinability of FIG.
즉, 본 발명의 초고내식 쾌삭 스테인리스강 제조방법에 의해 제조된 고고내식 쾌삭 스테인리스강은 시계 부품과 같은 정밀 부품으로서 요구되는 냉간압연 판재 및 용체화 판재의 요구 물성을 모두 매우 우수하게 만족하고 있는 것을 알 수 있다. That is, the highly corrosion-resistant free-cutting stainless steel produced by the ultra-high corrosion-resistant free-cutting stainless steel manufacturing method of the present invention satisfactorily satisfies both the required physical properties of the cold rolled sheet and the solution-plated sheet required as precision parts such as watch parts. Able to know.
연마시험은 표면조도 요구특성과 비교하였으며, 부식시험은 염수분무 시험으로 120시간 실시하여 부식 유무를 판별하였다. 냉간 압연판재의 표면조도 요구값은 Rmax=20으로 그 값을 모두 만족하였고, 냉간 압연판재의 120시간 염수 분무시험에서 부식은 발생하지 않았다.The polishing test was compared with the required surface roughness, and the corrosion test was conducted for 120 hours by the salt spray test to determine the presence of corrosion. The required value of surface roughness of the cold rolled sheet was Rmax = 20, and all of the values were satisfied, and no corrosion occurred in the 120 hour salt spray test of the cold rolled sheet.
본 발명의 초고내식 쾌삭 스테인리스강의 연마평재 제조방법에 의해 제조된 초고내식 쾌삭 스테인리스강의 연마평재의 평가 결과를 종합하면 다음 [표 6]과 같다. The results of the evaluation of the abrasive flat material of the ultra-high corrosion resistance free cutting stainless steel manufactured by the ultra-high corrosion resistance free-cut stainless steel abrasive manufacturing method of the present invention are summarized as follows.
[표 6]TABLE 6
즉, 본 발명에 의해 제조된 초고내식 스테인리스강은 시계 부품으로서 요구되는 냉간압연 판재의 요구 물성을 매우 우수하게 만족하고 있음을 알 수 있다. That is, it can be seen that the ultra high corrosion resistance stainless steel produced by the present invention satisfactorily satisfies the required physical properties of the cold rolled sheet material required as a watch part.
또한, 본 발명에 의한 냉간압연 판재와 기존 시계 케이스용 판재 및 일본회사 제품의 인공땀에 의한 부식시험을 수행한 결과 표면 조직 관찰결과와 무게 변화량에서도 본 발명에 의한 316F의 판재가 고급제품에 사용되는 일본제품 보다 더 우수한 것을 [표 7]에서 보는 바와 같이 알 수 있었다.In addition, the cold rolled sheet according to the present invention and the corrosion test by the artificial sweat of the existing watch case plate and the Japanese company's product as a result of the surface structure observation results and weight change amount of the 316F plate according to the present invention is used in high-quality products It was found to be superior to the Japanese product as shown in [Table 7].
[표 7]TABLE 7
상기한 바와 같이 본 발명은 초고내식 쾌삭 스테인리스강 제조시 SUS 316F 합금을 이용하여 쾌삭성을 구비하면서도, 냉간압연으로 내부 조직이 치밀하게 되어 가공성이 향상되며, 냉간압연에 따른 응력을 해소시키기 위한 적절한 용체화 열처리를 수행하여 생산공정이 간단해져서 생산기간이 단축되며, 열간압연 공정보다 생산 원가도 절감되므로 시계 케이스 부품, 카메라, 미싱, 의료기 및 정밀나사 등의 정밀부품들을 소량 다품종 생산하기에 유리한 이점이 있다. As described above, the present invention has excellent machinability by using SUS 316F alloy when manufacturing ultra-high corrosion-resistant free-cutting stainless steel. The production process is simplified by the solution heat treatment, which shortens the production period and reduces the production cost than the hot rolling process, which is advantageous for producing small quantities of various kinds of precision parts such as watch case parts, cameras, sewing machines, medical instruments, and precision screws. There is this.
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| KR (1) | KR100598610B1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4798634A (en) | 1986-02-10 | 1989-01-17 | Al Tech Specialty Steel Corporation | Corrosion resistant wrought stainless steel alloys having intermediate strength and good machinability |
| JPH03193823A (en) * | 1989-12-22 | 1991-08-23 | Daido Steel Co Ltd | Production of high strength stainless steel bolt for structural use |
| JPH0617197A (en) * | 1992-06-30 | 1994-01-25 | Aichi Steel Works Ltd | Precipitation hardening type stainless steel excellent in strength and corrosion resistance |
| JPH06346198A (en) * | 1993-06-14 | 1994-12-20 | Sanyo Special Steel Co Ltd | Precipitation hardening stainless steel excellent in cold workability and pitting corrosion resistance |
| JPH07150305A (en) * | 1993-11-30 | 1995-06-13 | Nkk Corp | Stainless steel thin sheet for id blade base plate excellent in breaking resistance and manufacture thereof |
| KR960037855A (en) * | 1995-04-28 | 1996-11-19 | 강진규 | High corrosion resistant free cutting stainless steel and its manufacturing method |
| KR20010055478A (en) * | 1999-12-10 | 2001-07-04 | 이구택 | An anti-bacterial stainless steel having superior anti-bacterial property and free cutting property and a method for manufacturing it |
-
2004
- 2004-10-23 KR KR1020040085069A patent/KR100598610B1/en not_active IP Right Cessation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4798634A (en) | 1986-02-10 | 1989-01-17 | Al Tech Specialty Steel Corporation | Corrosion resistant wrought stainless steel alloys having intermediate strength and good machinability |
| JPH03193823A (en) * | 1989-12-22 | 1991-08-23 | Daido Steel Co Ltd | Production of high strength stainless steel bolt for structural use |
| JPH0617197A (en) * | 1992-06-30 | 1994-01-25 | Aichi Steel Works Ltd | Precipitation hardening type stainless steel excellent in strength and corrosion resistance |
| JPH06346198A (en) * | 1993-06-14 | 1994-12-20 | Sanyo Special Steel Co Ltd | Precipitation hardening stainless steel excellent in cold workability and pitting corrosion resistance |
| JPH07150305A (en) * | 1993-11-30 | 1995-06-13 | Nkk Corp | Stainless steel thin sheet for id blade base plate excellent in breaking resistance and manufacture thereof |
| KR960037855A (en) * | 1995-04-28 | 1996-11-19 | 강진규 | High corrosion resistant free cutting stainless steel and its manufacturing method |
| KR20010055478A (en) * | 1999-12-10 | 2001-07-04 | 이구택 | An anti-bacterial stainless steel having superior anti-bacterial property and free cutting property and a method for manufacturing it |
Non-Patent Citations (1)
| Title |
|---|
| 1019960037855 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20040097073A (en) | 2004-11-17 |
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