KR20000033982A - Method for annealing ferritic stainless heat steel plate - Google Patents
Method for annealing ferritic stainless heat steel plate Download PDFInfo
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- KR20000033982A KR20000033982A KR1019980051077A KR19980051077A KR20000033982A KR 20000033982 A KR20000033982 A KR 20000033982A KR 1019980051077 A KR1019980051077 A KR 1019980051077A KR 19980051077 A KR19980051077 A KR 19980051077A KR 20000033982 A KR20000033982 A KR 20000033982A
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Organic Chemistry (AREA)
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- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
본 발명은 페라이트계 스테인레스 열연강판의 소둔방법(annealing method)에 관한 것이며, 특히, 내산화성 개선을 위해서, 소둔로 내부에 공급되는 수소가스의 이슬점을 낮추어 상기 열연강판을 소둔시키는 페라이트계 스테인레스 열연강판의 소둔방법에 관한 것이다.The present invention relates to an annealing method of a ferritic stainless steel hot rolled steel sheet (annealing method), in particular, to improve the oxidation resistance, ferritic stainless steel hot rolled steel sheet to anneal the hot rolled steel sheet by lowering the dew point of hydrogen gas supplied into the annealing furnace To annealing method.
여기에서 소둔(燒鈍)이란 제철소에서 가공 또는 담금질 등에 의해서 경화된 재료의 내부 균열을 없애고 결정립(結晶粒)을 미세화시켜 연성을 높이는 풀림(annealing)을 의미한다.Here, the annealing means annealing to remove the internal cracks of the material hardened by processing or quenching in the steel mill and to refine the crystal grains to increase the ductility.
일반적으로, 페라이트계 스테인레스 강판의 내산화성은 사용되는 환경의 산화온도 및 외부 반응가스(소재가 사용되는 환경의 외부기체를 지칭하며, 이하 '분위기'라 칭함)에 의존하지만, 소재 내부적으로는 강판의 합금 함량, 표면 조도 및 표면처리조건, 표면의 성분원소변화에 의해 대부분 결정되어 진다.In general, the oxidation resistance of ferritic stainless steel sheet depends on the oxidation temperature of the environment in which it is used and the external reaction gas (referring to the external gas of the environment in which the material is used, hereinafter referred to as 'atmosphere'), It is largely determined by the alloy content, surface roughness and surface treatment conditions, and elemental changes of the surface.
그리고, 페라이트계 스테인레스 강판의 내산화성은 합금원소함량에 큰 영향을 받는다. 특히, 외부대기와 소재 사이의 보호피막을 형성하는 크롬함량은 매우 중요하고 기타 알루미늄(Al), 규소(Si)등이 첨가될때 크롬보호피막의 안정성이 강화될 수 있다. 여기에서, 산화 반응이란 금속표면의 금속원자와 상기 분위기중의 산소원자가 화학적으로 결합하는 현상을 의미한다. 그러므로, 금속표면의 합금함량은 소재의 내산화성에 직접적인 영향을 미친다. 또한, 일반적으로 페라이트계 스테인레스 열연강판은 열간압연중에 두꺼운 크롬산화층이 표면에 형성되고, 산화층과 산화가 안된 금속층과의 경계면에는 크롬고갈층이 형성된다. 이후, 질산, 황산, 염산과 같은 산용액에 담궈 표면을 가공하는 산세(酸洗)가공 과정에서 표면산화층이 제거되면 크롬고갈층이 표면에 나타나 소재의 내산화성 열화의 원인이 된다. 열간압연후에 소둔시 산화층 발달을 방지하고자 수소 분위기와 같은 환원성가스중에서 열처리하는데 이때 환원성가스의 이슬점을 극저로 관리하면 표면의 크롬산화물이 분해되면서 산화층의 바로 밑에 고갈된 크롬함량을 회복시킬 수 있다.The oxidation resistance of the ferritic stainless steel sheet is greatly influenced by the alloying element content. In particular, the chromium content to form a protective film between the external atmosphere and the material is very important, and when the other aluminum (Al), silicon (Si), etc. is added, the stability of the chrome protective film can be enhanced. Here, the oxidation reaction means a phenomenon in which the metal atoms on the metal surface and the oxygen atoms in the atmosphere are chemically bonded. Therefore, the alloying content of the metal surface directly affects the oxidation resistance of the material. In general, a ferritic stainless hot rolled steel sheet has a thick chromium oxide layer formed on the surface during hot rolling, and a chromium depleted layer is formed on the interface between the oxide layer and the non-oxidized metal layer. Subsequently, when the surface oxide layer is removed in the pickling process in which the surface is immersed in an acid solution such as nitric acid, sulfuric acid, or hydrochloric acid, a chromium depleted layer appears on the surface to cause oxidation resistance degradation of the material. In order to prevent the development of an oxide layer during annealing after hot rolling, heat treatment is performed in a reducing gas such as a hydrogen atmosphere. When the dew point of the reducing gas is very low, chromium oxide on the surface is decomposed to recover the depleted chromium content just below the oxide layer.
이에 본 발명자들은 페라이트계 스테인레스열연강판의 내산화성이 강판의 합금함량, 표면처리조건뿐만 아니라 표면 크롬고갈층에 의해서도 크게 영향을 받는다는 사실을 발견하였다.The present inventors have found that the oxidation resistance of ferritic stainless steel sheets is greatly influenced by not only the alloy content of the steel sheet and the surface treatment conditions but also the surface chromium depleted layer.
종래 기술에 따른 페라이트계 스테인레스 열연강판의 소둔방법은 분위기 가스를 이슬점 -10℃의 수소로 사용하고, 페라이트계 스테인레스 강판에 사용되는 소둔조건과 유사하게 설정하였다. 이때의 소둔온도는 820℃이고 소둔시간은 36시간동안으로 수행하였다. 그러한 종래의 페라이트계 스테인레스 열연강판의 소둔방법은 먼저, 열간압연된 두께 5.0㎜의 Type 420 스테인레스 강판을 30 ㎜ × 30 ㎜로 절단한다. 그리고, 수소가스에 의한 환원성분위기내의 소둔로에서 열처리하고, 질산과 불산의 혼합용액으로 산세하였다. 수소가스의 이슬점 조절을 위해 분위기가스 유입전 습기제거장치와 습기발생장치를 통해 수증기분압을 제어하였고, 노외(爐外)로 방출된 수소가스의 이슬점을 측정하였다. 이렇게 종래의 페라이트계 스테인레스 열연강판의 소둔방법에 의해서 열처리된 강판은 일반적인 주사오제현미경(scanning auger microscopy)으로 분석되었다.The annealing method of the ferritic stainless hot rolled steel sheet according to the prior art was set similarly to the annealing conditions used for the ferritic stainless steel sheet using the atmosphere gas as hydrogen of dew point -10 ℃. The annealing temperature at this time was 820 ℃ and the annealing time was carried out for 36 hours. In the conventional annealing method of the ferritic stainless steel hot rolled sheet, first, a Type 420 stainless steel sheet having a thickness of 5.0 mm hot-rolled is cut into 30 mm x 30 mm. Then, the mixture was heat-treated in an annealing furnace in a reducing atmosphere by hydrogen gas, and pickled with a mixed solution of nitric acid and hydrofluoric acid. In order to control the dew point of the hydrogen gas, the partial pressure of water vapor was controlled through the moisture removal device and the moisture generator before the inlet of the atmosphere gas, and the dew point of the hydrogen gas discharged to the outside of the furnace was measured. The steel sheet heat-treated by the conventional annealing method of the ferritic stainless steel hot rolled sheet was analyzed by a general scanning auger microscopy.
그러나, 종래의 페라이트계 스테인레스 열연강판의 소둔방법으로 소둔된 강판은 산성에 약한 단점이 있다. 따라서, 이런 단점을 파악하기 위해 본 발명에서는 프로판가스를 연소시킨 습기내에서 최대 1000℃까지 가열하면서 산화량의 증가를 구하였다. 도 3에 도시된 바와 같이, 종래의 페라이트계 스테인레스 열연강판의 소둔방법에 의해서 소둔가공된 강판은 상대적으로 많은 산화량을 발생시켰다.However, the steel sheet annealed by the conventional annealing method of the ferritic stainless hot rolled steel sheet has a weak disadvantage in acidity. Therefore, in order to grasp this disadvantage, in the present invention, the increase in the amount of oxidation was calculated while heating up to 1000 ° C. in the moisture in which propane gas was burned. As shown in FIG. 3, the steel sheet annealed by the conventional annealing method of the ferritic stainless steel hot rolled sheet produced a relatively large amount of oxidation.
본 발명은 앞서 설명한 바와 같은 종래 기술의 문제점을 해결하기 위하여 안출된 것으로서, 강판을 열간압연후 환원성분위기내에서 열처리하는 공정에서 소둔로 내부의 수소가스의 이슬점을 낮추어 크롬고갈층을 회복시킴으로써, 내산화성을 향상시킬 수 있는 페라이트계 스테인레스 열연강판의 소둔방법을 제공하는 것을 그 목적으로 한다.The present invention has been made to solve the problems of the prior art as described above, by lowering the dew point of the hydrogen gas in the annealing furnace in the process of heat-treating the steel sheet in the reducing component crisis after hot rolling to recover the chromium depleted layer, It is an object of the present invention to provide an annealing method of a ferritic stainless hot rolled steel sheet capable of improving oxidative properties.
도 1은 종래 기술에 따른 페라이트계 스테인레스 열연강판의 소둔방법으로서, 이슬점이 -10℃인 수소 분위기에서 열처리된 스테인레스 강판의 산세(酸洗)가공후, 표면에서의 깊이에 따른 크롬량을 나타내는 그래프.1 is a graph showing an amount of chromium according to the depth at the surface after pickling processing of a stainless steel sheet heat-treated in a hydrogen atmosphere having a dew point of -10 ℃ as an annealing method of a ferritic stainless steel hot rolled sheet according to the prior art .
도 2는 본 발명의 한 실시예에 따른 페라이트계 스테인레스 열연강판의 소둔방법으로서, 이슬점이 -40℃인 수소 분위기에서 열처리된 스테인레스강판의 산세가공후 표면에서의 깊이에 따른 크롬량을 나타내는 그래프.2 is a graph showing the amount of chromium according to the depth at the surface after pickling of a stainless steel sheet heat-treated in a hydrogen atmosphere having a dew point of -40 ℃ as an annealing method of a ferritic stainless hot rolled steel sheet according to an embodiment of the present invention.
도 3은 도 2에 도시된 페라이트계 스테인레스 열연강판의 소둔방법과 종래의 소둔방법에서 산화중량의 증가를 비교설명하기 위한 그래프.Figure 3 is a graph for comparing the increase in the oxidation weight in the annealing method and the conventional annealing method of the ferritic stainless steel sheet shown in FIG.
앞서 설명한 바와 같은 목적을 달성하기 위한 본 발명에 따르면, 중량%로 C:0.3%이하, Cr:10-20%, Ni:1.0%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 강재를 열간압연후 800-1200℃의 온도범위의 환원성 분위기에서 소둔열처리를 실시하는 페라이트계 스테인레스 열연강판의 소둔방법이 제공된다. 그러한 본 발명의 페라이트계 스테인레스 열연강판의 소둔방법은 상기 열연강판을 소둔로 내부에서 열처리하는 공정에서 수소를 70%이상 함유하고, 이슬점이 -40℃이하인 환원성분위기내에서 강판표면의 산화층이 환원되어 크롬고갈층을 회복시키도록 열처리를 시행한다.According to the present invention for achieving the object described above, by weight% C: 0.3% or less, Cr: 10-20%, Ni: 1.0% or less, N: 0.1% or less, Si: 1.0% or less, Mn: Steels composed of 2.0% or less, Ti: 0.5% or less, Nb: 0.6% or less, Mo: 2.0% or less, Cu: 1.0% or less and the remaining Fe and other unavoidable impurities are hot-rolled in the temperature range of 800-1200 ° C. An annealing method of a ferritic stainless hot rolled steel sheet which is subjected to annealing heat treatment in a reducing atmosphere is provided. In the annealing method of the ferritic stainless steel sheet according to the present invention, the oxide layer on the surface of the steel sheet is reduced in a reducing atmosphere containing 70% or more of hydrogen in a heat treatment process of the hot rolled steel sheet in an annealing furnace and having a dew point of -40 ° C. or less. Heat treatment is performed to restore the chromium depleted layer.
아래에서, 본 발명에 따른 페라이트계 스테인레스 열연강판의 소둔방법을 첨부한 도면을 참조로 하여 상세히 설명하겠다.Hereinafter, with reference to the accompanying drawings an annealing method of the ferritic stainless steel hot rolled steel sheet according to the present invention will be described in detail.
도면에서, 도 2는 본 발명의 한 실시예에 따른 페라이트계 스테인레스 열연강판의 소둔방법으로서, 이슬점이 -40℃인 수소 분위기에서 열처리된 Type 420 스테인레스강판의 산세가공후 표면에서의 깊이에 따른 크롬량을 나타내는 그래프이고, 도 3은 도 2에 도시된 페라이트계 스테인레스 열연강판의 소둔방법과 종래의 소둔방법에서 산화중량의 증가를 비교설명하기 위한 그래프이다.In the drawings, Figure 2 is an annealing method of a ferritic stainless steel sheet according to an embodiment of the present invention, the chromium according to the depth at the surface after pickling of Type 420 stainless steel sheet heat-treated in a hydrogen atmosphere having a dew point of -40 ℃ Figure 3 is a graph showing the amount, Figure 3 is a graph for comparing the increase in the oxidation weight in the annealing method and the conventional annealing method of the ferritic stainless steel sheet shown in FIG.
본 발명의 한 실시예에 따른 페라이트계 스테인레스 열연강판의 소둔방법에서는 열처리하는 소둔로 내부에서 수소 혹은 수소와 질소가 혼합된 약환원성 분위기로 인하여, 열간압연시에 형성된 산화층과 그 바로 밑의 크롬고갈층을 스테인레스 강판에 존재하게 한다. 그리고, 제품의 품질을 높이기 위한 산세가공 이후에는 표면산화층이 제거되면서, 크롬고갈층이 표면에 나타나고, 소재의 내산화성은 매우 낮아진다.In the annealing method of the ferritic stainless hot rolled steel sheet according to an embodiment of the present invention, due to a weakly reducing atmosphere in which hydrogen or hydrogen and nitrogen are mixed in the heat treatment annealing furnace, an oxide layer formed during hot rolling and chromium depletion immediately below The layer is present on the stainless steel sheet. Then, after pickling processing to improve the quality of the product, the surface oxide layer is removed, the chromium depleted layer appears on the surface, the oxidation resistance of the material is very low.
본 발명의 페라이트계 스테인레스 열연강판의 소둔방법이 적용되는 소둔로 내부에는 수소가 70%이상 혼합된 분위기가스를 이슬점 -40℃이하로 냉각시킨다. 그럴 경우에는 아래의 화학식 1과 같이 크롬산화물이 분해되어 금속크롬과 산소기체로 분리된다.Inside the annealing furnace to which the annealing method of the ferritic stainless hot rolled steel sheet of the present invention is applied, an atmosphere gas containing 70% or more of hydrogen is cooled to a dew point of -40 ° C or lower. In this case, chromium oxide is decomposed to separate metal chromium and oxygen gas as shown in Chemical Formula 1 below.
2Croxide-＞ 2CrMETAL 2Cr oxide -> 2Cr METAL
+) 3Ooxide+ 6HGAS-＞ 3H2OGAS +) 3O oxide + 6H GAS- > 3H 2 O GAS
Cr2O3 oxide+ 6HGAS-＞ 2CrMETAL+ 3H2OGAS Cr 2 O 3 oxide + 6H GAS -> 2Cr METAL + 3H 2 O GAS
여기에서, Cr2O3 oxide는 산화층내 크롬산화물이고, Croxide는 산화층내 크롬원자이며, Ooxide는 산화층내 산소원자이고, CrMETAL는 금속중의 크롬원자이며, HGAS는 분위기중의 수소원자이며, H2OGAS는 분위기중의 물분자이다.Here, Cr 2 O 3 oxide is chromium oxide in the oxide layer, Cr oxide is chromium atom in the oxide layer, O oxide is oxygen atom in the oxide layer, Cr METAL is chromium atom in the metal, H GAS is hydrogen in the atmosphere atom, and, H 2 O GAS is the water molecules in the atmosphere.
본 발명의 페라이트계 스테인레스 열연강판의 소둔방법에 의해서 분해된 금속크롬은 산화층의 바로 밑에 존재하는 크롬고갈층내로 확산되어 이동하여 고갈된 크롬을 보충하여 크롬고갈층을 회복시킨다. 그리고, 산화층의 바로 밑의 크롬고갈층내 크롬함량이 회복되어 소지금속중의 크롬함량수준이 되면 고온의 가혹한 환경에서 사용중에 소재표면에 안정적이고 치밀한 크롬산화물의 형성이 용이하여 내산화성이 개선된다.The metal chromium decomposed by the annealing method of the ferritic stainless hot rolled steel sheet of the present invention diffuses into the chromium depleted layer existing directly below the oxide layer, and moves to replenish the depleted chromium to recover the chromium depleted layer. When the chromium content in the chromium depletion layer immediately below the oxide layer is restored and the chromium content level in the base metal is reached, stable and dense chromium oxide is easily formed on the surface of the material during use in a harsh, high temperature environment, and oxidation resistance is improved.
따라서, 본 발명에서는 페라이트계 스테인레스 열연강판을 열간압연후 환원분위기하에서 열처리하는 공정에서 로내에 수소가스를 70%이상 유입하고 이슬점을 -40℃이하로 유지하여 열처리를 시행하는 것이 바람직하다.Therefore, in the present invention, in the process of heat-treating the ferritic stainless hot-rolled steel sheet in a reduced atmosphere after hot rolling, it is preferable to perform heat treatment by introducing more than 70% of hydrogen gas into the furnace and keeping the dew point at -40 ° C or below.
아래에서는 앞서 상세히 설명한 바와 같은 페라이트계 스테인레스 열연강판의 소둔방법을 더욱 상세히 설명하기 위한 실험결과를 설명하겠다.Hereinafter, the experimental results for explaining in more detail the annealing method of the ferritic stainless steel sheet as described in detail above.
먼저, 아래의 표 1과 같은 주요성분의 함량으로 조성되어 있고, 두께 5.0㎜로 열간압연된 페라이트계 스테인레스 열연강판을 준비하였다.First, the ferrite-based stainless hot rolled steel sheet was prepared by the content of the main components shown in Table 1 below, and hot rolled to a thickness of 5.0 mm.
표 1에 나타낸 바와 같은 성분을 갖는 열연강판은 이슬점이 -40℃인 수소분위기에서 열처리되고, 산세가공된다.The hot rolled steel sheet having the components as shown in Table 1 is heat-treated and pickled in a hydrogen atmosphere having a dew point of -40 ° C.
도 2에서는 상기와 같이 가공된 열연강판의 표면에서의 깊이에 따른 크롬량을 보여준다. 그래프의 좌측인 표면에서의 크롬량이 소재내부의 크롬량보다 높게 측정된다. 즉 표면의 크롬고갈층이 모두 회복되었다.2 shows the amount of chromium according to the depth at the surface of the hot rolled steel sheet processed as described above. The amount of chromium on the left side of the graph is measured higher than the amount of chromium in the material. That is, all of the surface of the chromium depleted layer was recovered.
도 3에 보이듯이, 본 발명의 페라이트계 스테인레스 열연강판의 소둔방법에서는 상기 열연강판의 소둔로 열처리조건을 1000℃까지 가열중에 산화시간에 따른 기존소둔재와 개선소둔재의 산화무게 증가량을 비교하였다. 기존소둔방법에 비하여 본발명의 페라이트계 스테인레스 열연강판의 소둔방법에서는 상기 열연강판에서 산화중량의 증가가 약 0.5배 이하로 낮아져서 내산화성이 기대 이상으로 개선되었다.As shown in FIG. 3, in the annealing method of the ferritic stainless steel sheet according to the present invention, the amount of oxidation weight increase of the existing annealing material and the annealing material according to the oxidation time during the annealing furnace heat treatment condition of the hot rolled steel sheet was compared to 1000 ° C. . Compared with the conventional annealing method, the annealing method of the ferritic stainless hot rolled steel sheet of the present invention lowers the oxidation weight of the hot rolled steel sheet to about 0.5 times or less, thereby improving oxidation resistance more than expected.
앞서 상세히 설명한 바와 같이 본 발명의 페라이트계 스테인레스 열연강판의 소둔방법은 산화성에 강한 장점이 있다.As described in detail above, the annealing method of the ferritic stainless hot rolled steel sheet of the present invention has a strong advantage in oxidizing property.
또한, 본 발명의 페라이트계 스테인레스 열연강판의 소둔방법에 의해 열처리된 제품은 상대적으로 적은 산화량이 발생되기 때문에, 제품의 품질향상을 가져오는 장점이 있다.In addition, the product heat-treated by the annealing method of the ferritic stainless hot-rolled steel sheet of the present invention has an advantage that the quality of the product is improved because a relatively small amount of oxidation occurs.
또한, 본 발명의 페라이트계 스테인레스 열연강판의 소둔방법은 상기와 같이 제품의 내산화성을 향상시킬 수 있기 때문에, 다른 종류의 강재를 열처리하는데 응용될 수 있는 장점이 있다.In addition, the annealing method of the ferritic stainless steel hot rolled steel sheet of the present invention can improve the oxidation resistance of the product as described above, there is an advantage that can be applied to heat treatment of other kinds of steel.
이상에서 본 발명의 페라이트계 스테인레스 열연강판의 소둔방법에 대한 기술사상을 첨부도면과 함께 서술하였지만 이는 본 발명의 가장 양호한 실시예를 예시적으로 설명한 것이지 본 발명을 한정하는 것은 아니다. 또한, 이 기술분야의 통상의 지식을 가진 자이면 누구나 본 발명의 기술사상의 범주를 이탈하지 않는 범위내에서 다양한 변형 및 모방이 가능함은 명백한 사실이다.Although the technical idea of the annealing method of the ferritic stainless hot rolled steel sheet of the present invention has been described with the accompanying drawings, this is for illustrative purposes only and not for limiting the present invention. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105838985A (en) * | 2016-05-23 | 2016-08-10 | 安徽鑫宏机械有限公司 | Niobium pentoxide modified cast-infiltration composite wear-resistant hammerhead of mining-purpose crusher and production method thereof |
| CN106041028A (en) * | 2016-05-23 | 2016-10-26 | 安徽鑫宏机械有限公司 | Crusher abrasion-resistant hammer head for magnesium aluminum silicate modified casting infiltration compound ore and production method of crusher abrasion-resistant hammer head |
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1998
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105838985A (en) * | 2016-05-23 | 2016-08-10 | 安徽鑫宏机械有限公司 | Niobium pentoxide modified cast-infiltration composite wear-resistant hammerhead of mining-purpose crusher and production method thereof |
| CN106041028A (en) * | 2016-05-23 | 2016-10-26 | 安徽鑫宏机械有限公司 | Crusher abrasion-resistant hammer head for magnesium aluminum silicate modified casting infiltration compound ore and production method of crusher abrasion-resistant hammer head |
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