KR20010063549A - a method of manufacturing austenitic stainless steel plates with good pickling property - Google Patents
a method of manufacturing austenitic stainless steel plates with good pickling property Download PDFInfo
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- KR20010063549A KR20010063549A KR1019990060664A KR19990060664A KR20010063549A KR 20010063549 A KR20010063549 A KR 20010063549A KR 1019990060664 A KR1019990060664 A KR 1019990060664A KR 19990060664 A KR19990060664 A KR 19990060664A KR 20010063549 A KR20010063549 A KR 20010063549A
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- 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
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
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- 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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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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Abstract
Description
본 발명은 산세성이 향상된 오스테나이트계 스테인레스 냉연강판의 제조방법에 관한 것으로서, 보다 상세하게는 산세성 개선을 위해 냉연소둔 산세전에 강판표면에 압연유를 도포하여 오스테나이트계 스테인레스강을 산세하는 냉연강판의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing an austenitic stainless cold rolled steel sheet having improved pickling properties, and more particularly, a cold rolled steel sheet for pickling austenitic stainless steel by applying rolling oil to the surface of a steel sheet before cold rolling annealing to improve pickling properties. It relates to a manufacturing method of.
일반적으로, 오스테나이트계 스테인레스 냉연강판의 산세성은 산세조건, 소둔조건 그리고 소둔전 강판의 표면상태에 의해 크게 영향을 받는다. 그리고 이러한 소둔전 강판의 표면상태는 냉간압연조건을 변화시키거나 압연유와 같은 표면도포액의 잔존량에 따라 변화될 수 있다. 즉, 냉간압연중 마무리 압연시 압연유제거 브러쉬의 작동조건을 제어하거나 소둔전 강판 표면에 압연유를 인위적으로 도포하는 부가장치를 설치하여 강판 표면의 압연유 도포량을 변화시킬 수 있기 때문에 오스테나이트계 스테인레스강의 산세성은 압연유 도포량에 따라 변화된다.In general, pickling properties of austenitic stainless cold rolled steel sheets are greatly affected by pickling conditions, annealing conditions and the surface condition of the steel sheet before annealing. In addition, the surface state of the steel sheet before annealing may be changed depending on the cold rolling conditions or the remaining amount of the surface coating liquid such as rolling oil. That is, the austenitic stainless steel can be pickled by controlling the operating conditions of the rolling oil removal brush during cold rolling or by installing an additional device for artificially applying the rolling oil to the surface of the steel sheet before annealing. The properties change depending on the amount of rolled oil applied.
오스테나이트계 스테인레스 냉연강판의 산세성은 압연유의 도포량에 따라 크게 영향을 받는 것으로 알려져 있다. 실제로 오스테나이트계 스테인레스 냉연강판을 소둔산세할 때 강판 표면의 잔류 압연유층이 불균일하게 분포되면 산세후 강판 표면의 산세성이 상당히 불균일해짐이 확인되었다. 강판 표면의 압연유 도포량을 제어하여 산세성이 촉진된다는 보고는 아직 없지만, 도포된 압연유가 소둔중에 고온에서 기지금속중 크롬과 반응하여 강판 표면의 산화스케일 구조를 변화시켜 산세 과정이 영향을 받을 수 있다.Pickling properties of the austenitic stainless cold rolled steel sheet are known to be greatly affected by the coating amount of the rolling oil. In fact, when annealing the austenitic stainless cold rolled steel sheet, if the residual rolling oil layer on the surface of the steel sheet was unevenly distributed, the pickling property of the steel sheet surface after pickling was considerably uneven. Although it has not been reported that pickling is promoted by controlling the amount of rolling oil applied to the surface of the steel sheet, the applied rolling oil may react with chromium in the base metal at high temperature during annealing to change the oxidation scale structure of the steel sheet surface so that the pickling process may be affected. .
이에 본 발명자들은 오스테나이트계 스테인레스 냉연강판의 산세성이 산세조건과 소둔조건 뿐만아니라 압연유 도포량의 제어에 의한 소둔전 강판표면 상태를 변화시킴에 의해서도 크게 영향을 받는다는 사실을 발견하고, 그 근거에 의해 본 발명을 제안한 것으로, 본 발명은 오스테나이트계 스테인레스 냉연강판을 냉간압연후 열처리하는 공정에서 열처리전 강판표면의 압연유 도포량을 제어함으로써, 산세성을 개선시킬 수 있는 오스테나이트계 스테인레스 냉연강판의 제조방법을 제공하는 데, 그 목적이 있다.Accordingly, the present inventors have found that pickling properties of austenitic stainless cold rolled steel sheets are greatly influenced not only by pickling conditions and annealing conditions but also by changing the surface state of the steel sheet before annealing by controlling the amount of rolled oil applied thereto. According to the present invention, the present invention provides a method for producing an austenitic stainless cold rolled steel sheet which can improve pickling property by controlling the amount of rolling oil applied to the surface of the steel sheet before heat treatment in the step of heat-treating the austenitic stainless cold rolled steel sheet after cold rolling. To provide it, its purpose is.
상기 목적을 달성하기 위한 본 발명은 중량 %로 C:0.1%이하, Cr : 10-20%, Ni:5-12%이하, N : 0.1% 이하, Si : 1.0%이하, Mn : 2.0% 이하, Ti : 0.5%이하, Nb: 0.6%이하, Mo : 2.0%이하, Cu : 1.0%이하, 나머지 Fe 및 기타 불가피한 불순물로 조성되는 냉연강판을 1000∼1250℃의 온도범위에서 소둔열처리를 실시하는 방법에 있어서, 상기 강판을 소둔열처리전 강판표면의 압연유도포량을 80∼150cc/m2으로 제어하여 소둔을 시행하는 오스테나이트계 스테인레스 냉연강판의 제조방법에 관한 것이다.The present invention for achieving the above object by weight% C: 0.1% or less, Cr: 10-20%, Ni: 5-12% or less, N: 0.1% or less, Si: 1.0% or less, Mn: 2.0% or less , Annealing heat treatment is performed on the cold rolled steel sheet composed of Ti: 0.5% or less, Nb: 0.6% or less, Mo: 2.0% or less, Cu: 1.0% or less, remaining Fe and other unavoidable impurities in the temperature range of 1000 to 1250 ° C. The method relates to a method for producing an austenitic stainless cold rolled steel sheet in which the steel sheet is subjected to annealing by controlling the rolling guide coating amount on the surface of the steel sheet before annealing heat treatment to 80 to 150 cc / m 2 .
도 1은 일반 소둔재와 도포소둔재의 소둔열처리후 강판 표면의 산화스케일층 두께를 비교한 그래프도.1 is a graph comparing the thickness of the oxide scale layer of the surface of the steel sheet after the annealing heat treatment of the general annealing material and the coating annealing material.
도 2는 일반 소둔재와 도포소둔재의 소둔산세후 강판 표면의 백색도를 비교한 그래프도.Figure 2 is a graph comparing the whiteness of the surface of the steel sheet after annealing of the general annealing material and the coating annealing material.
이하, 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.
오스테나이트계 스테인레스 냉연강판을 소둔열처리하여 산세하는 경우, 두께0.5∼3.0mm의 강판을 과잉산소량 1%이상을 함유하는 1000∼1250℃의 연소로내에서 연속적으로 소둔하여 강판표면에는 철-크롬계의 산화물이 약 2500∼4000Å의 두꺼운 피막이 형성된다. 열처리 직후 냉연강판은 황산조와 혼산조를 통과하면서 표면의 소둔산화물이 제거되면서 산세가 진행되며, 산세 직후에는 연속적으로 세척조내에서 강판 표면의 잔류 산세액이 세척된다.In the case of annealing and pickling austenitic stainless cold rolled steel sheets, steel sheets 0.5 to 3.0 mm thick are continuously annealed in a combustion furnace at 1000 to 1250 ° C. containing 1% or more of excess oxygen, Oxide forms a thick film having a thickness of about 2500 to 4000 Pa. Immediately after the heat treatment, the cold rolled steel sheet passes through the sulfuric acid bath and the mixed acid bath, and pickling proceeds as the annealing oxide is removed from the surface. Immediately after the pickling, residual pickling liquid on the surface of the steel sheet is continuously washed in the washing bath.
황산조와 혼산조내에는 강판 표면의 산화물이 산용액과 화학반응을 일으키고 산화스케일층 직하의 크롬고갈층이 집중적으로 부식되어 산화스케일층이 금속표면에서 박리된다. 산화스케일이 두꺼우면 산화층과 기지금속계면에서의 산소분압이 낮아지고 상대적으로 산소친화력이 높은 크롬의 선택적 산화가 발생되어 기지금속내 크롬고갈층의 형성이 용이하다.In the sulfuric acid tank and the mixed acid tank, the oxide on the surface of the steel sheet causes a chemical reaction with the acid solution, and the chromium depleted layer immediately under the oxide scale layer intensively corrodes, causing the oxide layer to peel off from the metal surface. The thicker the oxide scale, the lower the partial pressure of oxygen at the oxide layer and the base metal interface, and the selective oxidation of chromium, which has a relatively high oxygen affinity, to facilitate formation of a chromium depleted layer in the base metal.
강판표면에 압연유가 도포되면 압연유중의 탄소성분이 열처리중 크롬과 반응하여 크롬탄화물을 형성하므로 초기에는 보호성이 약한 철산화물이 주로 형성되어 산화스케일층이 두꺼워진다. 이후 두꺼운 산화스케일층과 기지금속 사이의 산소분압이 낮아지면 크롬의 선택적 산화가 발생되어 기지금속내 크롬고갈층이 형성된다.When rolling oil is applied to the surface of the steel sheet, the carbon component in the rolling oil reacts with chromium during heat treatment to form chromium carbide, so that iron oxides having weak protective properties are mainly formed, resulting in a thick oxide scale layer. Subsequently, when the oxygen partial pressure between the thick oxide scale layer and the base metal is lowered, selective oxidation of chromium occurs to form a chromium depleted layer in the base metal.
강판표면의 압연유도포량을 제어하기 위해서는 냉간압연중에 압연유제거브러쉬의 작동조건을 변화시키거나, 별도로 도포라인을 설치하는 방법도 있지만, 냉간압연후 소둔까지의 대기시간중 도포된 압연유가 흘러서 일정 도포량을 유지하기가 힘들고 별도의 도포장치의 도입하는 것은 설비 투자와 유지비용이 발생한다.In order to control the amount of rolling induction on the surface of the steel sheet, there is a method of changing the operating condition of the oil removal brush during cold rolling or installing a coating line separately.However, the applied rolling oil flows during the waiting time until the annealing after cold rolling. Difficult to maintain and the introduction of a separate coating device incurs equipment investment and maintenance costs.
소둔열처리설비에서 강판이 로내에 들어가기 직전에 고무롤 사이를 통과시키면서 압연유를 도포시키면, 도포량의 제어와 유지가 가능하므로 오스테나이트계 스테인레스강의 산세성이 개선될 수 있다. 이 방법은 별도의 도포설비와 같은 높은 설치비용과 유지경비를 발생시키지 않으므로 현장적용이 용이하다.In the annealing heat treatment equipment, when the rolling oil is applied while passing between the rubber rolls just before entering the furnace, pickling of the austenitic stainless steel can be improved because the coating amount can be controlled and maintained. This method is easy to apply in the field because it does not incur high installation cost and maintenance cost like separate coating equipment.
따라서, 본 발명에서는 오스테나이트계 스테인레스 냉연강판을 1000∼1250℃의 온도범위에서 소둔열처리후 산세를 실시하는 경우 소둔열처리전 강판표면의 압연유도포량을 80∼150 cc/m2으로 제어할 수 있는 고무롤을 설치하여 소둔을 시행하는 것이 바람직하다.Accordingly, in the present invention, when the austenitic stainless cold rolled steel sheet is subjected to pickling after annealing heat treatment at a temperature range of 1000 to 1250 ° C., a rubber roll capable of controlling the rolling induction amount on the surface of the steel sheet before the annealing heat treatment is 80 to 150 cc / m 2 . It is preferable to perform annealing by installing a.
본 발명에 있어서 오스테나이트계 스테인레스 냉연강판의 소둔공정은 냉연강판을 1000∼1250℃에서 소둔열처리하여 연속적으로 황산조와 혼산조에서 산세중에 소둔전 고무롤 사이에 냉연강판을 통과시켜 강판표면의 압연유도포량을 80∼150cc/m2으로 제어할 수 있는 압연유도포용 고무롤을 설치하여 소둔을 시행하는것이 바람직하고, 압연유량을 제어하기 위해서는 별도의 압연유 보관용기와 유량제어기가 필요하다.In the present invention, the annealing process of the austenitic stainless cold rolled steel sheet is subjected to annealing heat treatment of the cold rolled steel sheet at 1000 ~ 1250 ℃ to continuously pass the cold rolled steel sheet between the rubber roll before annealing during pickling in sulfuric acid tank and mixed acid bath to reduce the amount of rolling induction on the surface of the steel sheet It is preferable to perform annealing by installing a rolling guide rubber roll that can be controlled at 80 to 150 cc / m 2 , and a separate rolled oil storage container and a flow controller are required to control the rolling flow rate.
이하, 실시예를 통하여 본 발명을 설명한다.Hereinafter, the present invention will be described through examples.
(실시예)(Example)
주요 성분의 함량이 하기 표 1과 같이 조성되는 두께 1.0mm의 오스테나이트계 스테인레스 냉연강판을 준비한 후 40(W)×40(L)×1.0(t)mm의 크기로 시편을 제작하였다.After preparing the austenitic stainless steel cold rolled steel sheet having a thickness of 1.0 mm having a main component content as shown in Table 1, a specimen was manufactured in a size of 40 (W) x 40 (L) x 1.0 (t) mm.
(단위 : 중량%)(Unit: weight%)
이후, 상기 냉연강판의 소둔조건을 두가지로 변화시켰는데, 첫번째는 압연유를 추가도포하지 않은 소둔방법(이하, '일반소둔재'라 칭함)이고, 두 번째는 압연유를 인위적으로 도포한 소둔방법(이하, '도포소둔재'라 칭함)의 두종류의 시편이다.Then, the annealing conditions of the cold-rolled steel sheet were changed into two, the first is an annealing method (hereinafter referred to as a general annealing material) without further rolling oil, and the second annealing method artificially coated rolling oil ( Hereinafter, two kinds of specimens are referred to as 'coating annealing material'.
일반소둔재는 냉간압연된 강판을 그대로 사용하였고, 강판표면의 잔류압연유량은 60cc/m2으로 측정되었다. 도포소둔재는 냉간압연후 고무롤 사이를 통과시키면서 압연유를 추가도포하였고 강판표면의 압연유도포량은 100cc/m2이었다.The cold rolled steel sheet was used as the general annealing material, and the residual rolling flow rate of the surface of the steel sheet was measured to be 60 cc / m 2 . The coated annealing material was further coated with rolling oil while passing between the rubber rolls after cold rolling, and the amount of rolling induction on the surface of the steel sheet was 100 cc / m 2 .
상기의 두가지 시험재에 대하여 소둔열처리조건은 통상이 오스테나이트계 스테인레스 냉연소둔조건과 유사하게 설정하였는데, 소둔온도는 1150℃이고 소둔시간은 가열시간 40초와 등온유지시간 20초의 총 60초간 수행하였다. 소둔분위기는 Propane가스를 연료로 하여 과잉산소 4.0%에서 열처리하였다.The annealing heat treatment conditions for the two test materials were generally set similar to those of the austenitic stainless cold rolling annealing conditions. The annealing temperature was 1150 ° C., and the annealing time was performed for a total of 60 seconds including a heating time of 40 seconds and an isothermal holding time of 20 seconds. . The annealing atmosphere was heat treated at 4.0% excess oxygen using Propane gas as a fuel.
산세는 오스테나이트계 스테인레스강의 통상 산세법인 황산과 혼산조내에서 침지방식을 적용하였는데 하기 표 2에서와 같이 소둔열처리된 냉연강판을 500℃의 염욕조내에서 10초간 침지후 50℃의 황산에 20초간 침지하고 55℃의 혼산조내에서 10초간 침지하여 산세하였다.The pickling was applied by dipping in sulfuric acid and a mixed acid bath, which is a common pickling method of austenitic stainless steel. After the annealing heat-treated cold rolled steel sheet was immersed in a salt bath at 500 ° C. for 10 seconds, It was immersed for a second and immersed for 10 seconds in a mixed acid bath at 55 DEG C and pickled.
열처리후에 강판표면의 산화스케일층 두께를 측정하기 위해 SAM(Scanning Auger Microscopy) Depth-profile 분석을 하였고, 산세후에 강판의 산세성 정도를 평가하기 위해 백색도를 측정하였다. 백색도가 높은 경우 산세성은 우수하다.After the heat treatment, a scanning auger microscopy (SAM) depth profile analysis was performed to measure the thickness of the oxide scale layer on the surface of the steel sheet, and whiteness was measured to evaluate the degree of pickling of the steel sheet after pickling. If the whiteness is high, pickling is excellent.
도 1은 일반소둔재와 도포소둔재의 두가지 소둔재에 대해서 산화스케일층 형성에 대한 표면조건의 영향을 보여준다. 도포소둔재는 산화스케일층 두께가 4200Å으로 두꺼운 반면에 일반소둔재는 3000Å으로 얇았다.FIG. 1 shows the effect of surface conditions on the formation of an oxide scale layer for two annealing materials, a general annealing material and a coating annealing material. The applied annealing material had a thick oxide scale layer of 4200Å, while the general annealing material was as thin as 3000Å.
도 2는 일반소둔재와 도포소둔재의 두가지 소둔재에 대해서 산세성에 대한 표면조건의 영향을 보여준다. 도포소둔재는 백색도값이 65로 높은 반면에 일반소둔재는 54로 낮았다.Figure 2 shows the effect of surface conditions on pickling properties for the two annealing materials, general annealing material and coating annealing material. The coating annealing material had a high whiteness value of 65, while the general annealing material had a low value of 54.
상술한 바와 같이, 본 발명의 오스테나이트계 스테인레스 냉연강판의 소둔방법에의하면 우수한 고유특성이 손상되지 않고, 제조공정상의 어려움이 없이 강판의 산세성을 향상시킴에 의해 제품의 생산성과 품질향상을 기대할 수 있는 효과를 지닌다.As described above, according to the annealing method of the austenitic stainless cold rolled steel sheet of the present invention, excellent intrinsic properties are not impaired, and the pickling property of the steel sheet is improved without difficulty in the manufacturing process, thereby improving product productivity and quality. It can have the effect.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5735619A (en) * | 1980-08-08 | 1982-02-26 | Sumitomo Metal Ind Ltd | Annealing method for cold rolled steel plate |
| JPS6156721A (en) * | 1984-08-25 | 1986-03-22 | Kawasaki Steel Corp | Production of stainless cold rolled strip |
| JPS6217138A (en) * | 1985-07-13 | 1987-01-26 | Nisshin Steel Co Ltd | Method for continuously annealing cold rolled austenitic stainless steel strip |
| JPH02169107A (en) * | 1988-12-23 | 1990-06-29 | Kawasaki Steel Corp | Manufacture of preliminary treatment stainless steel strip for cold rolling |
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1999
- 1999-12-22 KR KR1019990060664A patent/KR20010063549A/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5735619A (en) * | 1980-08-08 | 1982-02-26 | Sumitomo Metal Ind Ltd | Annealing method for cold rolled steel plate |
| JPS6156721A (en) * | 1984-08-25 | 1986-03-22 | Kawasaki Steel Corp | Production of stainless cold rolled strip |
| JPS6217138A (en) * | 1985-07-13 | 1987-01-26 | Nisshin Steel Co Ltd | Method for continuously annealing cold rolled austenitic stainless steel strip |
| JPH02169107A (en) * | 1988-12-23 | 1990-06-29 | Kawasaki Steel Corp | Manufacture of preliminary treatment stainless steel strip for cold rolling |
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