KR20010095809A - Method for manufacturing ferritic stainless hot rolled steel sheet - Google Patents

Method for manufacturing ferritic stainless hot rolled steel sheet Download PDF

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Publication number
KR20010095809A
KR20010095809A KR1020000019190A KR20000019190A KR20010095809A KR 20010095809 A KR20010095809 A KR 20010095809A KR 1020000019190 A KR1020000019190 A KR 1020000019190A KR 20000019190 A KR20000019190 A KR 20000019190A KR 20010095809 A KR20010095809 A KR 20010095809A
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South Korea
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hot
ferritic stainless
coil
hot rolled
annealing furnace
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KR1020000019190A
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Korean (ko)
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우병성
남지형
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이구택
포항종합제철 주식회사
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Priority to KR1020000019190A priority Critical patent/KR20010095809A/en
Publication of KR20010095809A publication Critical patent/KR20010095809A/en

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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
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • 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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

PURPOSE: A method of manufacturing ferritic stainless hot rolled steel sheet is provided to improve conventional batch annealing stage by directly transferring hot coil, without air cooling, to batch annealing furnace where hot coil is slowly cooled by using latent heat of the hot coil. CONSTITUTION: This method comprises the steps of (i) coiling ferritic stainless steel sheet at a temperature of over 800deg.C after hot rolling ferritic stainless steel wherein the ferritic stainless steel comprises Cr 11-13wt.% and the amount of C+N is between 0.02 and 0.035%; (ii) charging hot coil into batch annealing furnace after hot coiling; (iii) annealing the hot coil in the batch annealing furnace in the temperature range 730-770deg.C for at least 5 min.

Description

페라이트계 스테인레스 열연강판의 제조방법{Method for manufacturing ferritic stainless hot rolled steel sheet}Method for manufacturing ferritic stainless hot rolled steel sheet {Method for manufacturing ferritic stainless hot rolled steel sheet}

본 발명은 페라이트계 스테인레스 열연강판의 제조방법에 관한 것으로, 보다 상세하게는 권취코일의 잠열에 의한 보열소둔에 의해 상소둔시간을 줄이는 방법에관한 것이다.The present invention relates to a method for producing a ferritic stainless hot rolled steel sheet, and more particularly, to a method for reducing an annealing time by thermal annealing by latent heat of a winding coil.

일반적으로 페라이트 스테인레스 열연강판은 도 1에서와 같이, 열간압연기에서 고온의 소재를 원하는 압연사이즈로 압연후에 수냉대에서 스트립을 약 700℃정도로 냉각하고 권취기에서 감아 코일의 형태로 권취한다. 이러한 코일은 대기에서 2, 3일간 냉각하여 권취코일의 온도를 100℃이하로 한 다음 상소둔 한다. 700℃의 온도에서 저온권취하면 오스테나이트가 마르텐사이트로 변태되어 항복강도 80kg/mm2로 매우 경화된 재질을 가져 냉간압연이 곤란하다. 이러한 연유로 장시간동안 상소둔하여 냉간압연이 가능한 연한재질을 얻고 있다.In general, ferritic stainless hot rolled steel sheet, as shown in Figure 1, after rolling the hot material in a hot rolling mill to a desired rolling size, the strip is cooled to about 700 ° C in a water cooler and wound in a coil to wind up in the form of a coil. These coils are cooled in the air for 2 or 3 days to bring the coiling temperature below 100 ° C and then annealing. Cold winding at a temperature of 700 ℃ austenite is transformed to martensite has a very hardened material with a yield strength of 80kg / mm 2 it is difficult to cold rolling. With such condensed milk, it is annealed for a long time to obtain a soft material which can be cold rolled.

상소둔은 권취코일을 2∼3단으로 적치후에 이너커버(14)를 덮고 그 위에 다시 보열커버(12)를 덮은 다음 이너커버 내부에 불활성가스인 질소 또는 수소를 채운 후 가열과 균열을 하여 20시간 소둔한 후 보열커버(12)와 이너커버914)를 제거한 채 냉각을 행한다. 이러한 소둔과 냉각은 총 2, 3일 가량의 시간이 걸리며 에너지가 많이 소비되는 문제점이 있다.After the annealing is applied in two or three stages of the coiling coil, the inner cover 14 is covered, and the heat retaining cover 12 is covered thereon. The inner cover is filled with nitrogen or hydrogen, which is inert gas, and heated and cracked. After annealing for a while, cooling is performed while the heat retaining cover 12 and the inner cover 914 are removed. This annealing and cooling takes a total of about 2 or 3 days and has a problem of consuming a lot of energy.

본 발명은 에너지 다소비공정인 상소둔방법을 개선하기 위하여 안출된 것으로, 그 목적은 권취직후에 대기냉각을 행하지 않고 바로 상소둔로로 이송하여 코일의 내부잠열을 이용하여 코일을 서서히 냉각하여 재질을 연화시켜 상소둔시간과 에너지 절감방법을 제공하는데, 그 목적이 있다.The present invention has been made in order to improve the annealing method which is a somewhat energy-consuming process, the object of this is to transfer to the annealing furnace immediately without winding the air immediately after winding the material by slowly cooling the coil using the latent heat of the coil material By softening the to provide an annealing time and energy saving method, the purpose is.

도 1은 종래의 스테인레스 열연강판의 제조공정도1 is a manufacturing process of the conventional stainless hot rolled steel sheet

도 2는 본 발명의 스테인레스 열연강판의 제조공정도Figure 2 is a manufacturing process of the stainless hot rolled steel sheet of the present invention

도 3은 본 발명에 따라 상소둔로에 장입된 코일의 잠열에 따른 온도변화를 나타내는 그래프Figure 3 is a graph showing the temperature change according to the latent heat of the coil charged in the annealing furnace according to the present invention

도 4는 열연스트립의 소둔온도에 따른 항복응력의 변화를 나타내는 그래프4 is a graph showing the change in yield stress according to the annealing temperature of the hot rolled strip

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

10..... 상소둔로 12..... 보열커버10 ..... annealing furnace 12 ..... thermal cover

14.....이너커버 22.....수냉대Inner cover 22..Water cooling

41.....코일외권부 42.....코일내권부41 ..... Coil inside 42 ..... Coil inside

43.....코일내부43 .... inside the coil

상기 목적을 달성하기 위한 본 발명은,The present invention for achieving the above object,

페라이트계 스테인레스 강을 열간압연하고, 800℃이상의 온도에서 열연코일로 권취하는 단계;Hot-rolling the ferritic stainless steel and winding the hot-rolled coil at a temperature of 800 ° C. or higher;

상기 권취직후 열연코일을 상소둔로에 장입하는 단계;Charging the hot rolled coil immediately after the winding into an furnace annealing furnace;

이어 상소둔로의 보열커버를 덮어 코일의 잠열에 의해 열연코일을 소둔하는 단계;를 포함하여 구성된다.And covering the thermal cover of the annealing furnace and annealing the hot rolled coil by latent heat of the coil.

이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

본 발명은 도 2에 나타난 바와 같이, 페라이트 스테인레스강을 열간압연한 다음에 대기냉각하지 않고 바로 상소둔로에 장입하여 코일의 내부잠열에 의해 로안에서 서서히 냉각되도록 하여 재질이 연화되도록 함으로써 상소둔하는데 소요되는 시간과 에너지를 절감하는데, 특징이 있다.The present invention, as shown in Figure 2, hot-rolled ferritic stainless steel and then charged directly to the annealing furnace without atmospheric cooling to gradually cool in the furnace by the latent heat of the coil to soften the material to annealing It is characterized by saving time and energy.

본 발명의 대상강종은 페라이트계 스테인레스강으로, 바람직하게는 Cr:11∼13%이고, C+N이 0.02∼0.035%이다. C+N의 합을 0.02∼0.035%로 낮추면 압연온도를 약 100℃ 정도(예를 들어 1100℃에서 1000℃로)로 낮출 수 있어 이 구역에서 오스테나이트 양이 70∼80%전후를 가지도록 할 수 있다. 따라서, 항복응력을 상승시키는 C와 N의 합이 매우 낮아지므로 경질의 마르텐사이트 조직이 연질의 페라이트변태시간을 단축할 수 있다. 본 발명에서 적용 가능한 페라이트계 스테인레스강의 대표적인 예로는 Cr:11∼13고, C+N이 0.02∼0.035%, Si:1.0%이하, Mn:1.0%이하 나머지 Fe와 불가피한 불순물로 조성되는 강이다.The subject steel grade of the present invention is ferritic stainless steel, preferably 11% to 13% Cr and 0.02% to 0.035% C + N. By lowering the sum of C + N to 0.02 to 0.035%, the rolling temperature can be lowered to about 100 ° C (for example, from 1100 ° C to 1000 ° C) so that the austenite content can be around 70-80% in this zone. Can be. Therefore, since the sum of C and N which raises the yield stress becomes very low, the hard martensite structure can shorten the soft ferrite transformation time. Representative examples of the ferritic stainless steel applicable in the present invention are steels of Cr: 11 to 13, C + N of 0.02 to 0.035%, Si: 1.0% or less, and Mn: 1.0% or less of Fe and unavoidable impurities.

상기와 같은 페라이트계 스테인레스강을 통상의 방법으로 열간압연하고 이어 코일을 권취하는데, 이때 기존의 방법과 같이 수냉대를 통과하면서 700℃이하로 저온권취하면 오스테나이트가 마르텐사이트로 변태되어 항복강도가 80kg/㎟로 매우 경화된 재질을 갖는다. 이러한 연유로 종래에는 상소둔으로 장시간(20시간 정도)소둔하지 않으면 냉간압연이 어려울 뿐만 아니라 스트립이 파단하는 등 작업이 어려웠다.The ferritic stainless steel as described above is hot rolled in a conventional manner, and then the coil is wound. In this case, when the low temperature winding is performed at 700 ° C. or lower while passing through a water cooling stand, the austenite is transformed into martensite and the yield strength is increased. It has a very hardened material of 80 kg / mm2. For this reason, in the past, cold rolling is difficult as well as the strip is broken unless it is annealed for a long time (about 20 hours) by ordinary annealing.

본 발명에서는 열간압연하고 고온권취하고 대기 냉각 없이 바로 상소둔로에 열연코일을 장입한 다음 상소둔로의 보열커버를 덮는다. 권취온도는 800℃이상의 온도에서 하는 것이 바람직하다.In the present invention, hot-rolled, high-temperature winding, the hot-rolled coil is charged directly to the annealing furnace without air cooling, and then covers the thermal cover of the annealing furnace. It is preferable to wind up at the temperature of 800 degreeC or more.

본 발명에 따라 권취코일을 바로 상소둔로에 장입하여 보열커버를 덮으면, 코일은 잠열에 의하여 서서히 냉각되는데, 그 냉각패턴은 도 3과 같다. 권취된 코일은 이송과정중 대기에 의하여 부분적으로 냉각되지만, 상소둔로에 장입되면 냉각이 가장 빠른 부분인 외권부는 소둔로의 내화벽돌 단열성에 의하여 서서히 냉각되는 것외에, 소둔로의 단열 및 코일내부의 잠열에 의하여 온도가 상승하면서 내,외권부가 770℃이상 상승되어 다시 서서히 냉각된다.According to the present invention, if the coil is charged directly to the upper annealing furnace to cover the thermal cover, the coil is gradually cooled by latent heat, and its cooling pattern is as shown in FIG. 3. The coil wound is partially cooled by the atmosphere during the transfer process, but when charged into the annealing furnace, the outer winding part, which is the fastest cooling part, is gradually cooled by the refractory brick insulation of the annealing furnace. As the temperature rises due to the latent heat inside, the inner and outer windings rise above 770 ° C and gradually cool down again.

이러한 서냉과정에서 권취코일은 730∼770℃ 근처의 온도영역대를 거치면서 냉각되므로 열간압연시 생성된 오스테나이트가 항복응력이 높은 마르텐사이트로 변태를 하지 않고 항복응력이 낮은 페라이트상으로 변태하므로서 재질을 연화할 수 있다. 이와 같이 코일이 잠열에 의해 770∼730℃에서 5분이상 유지되면 항복응력을 냉간압연에 유효한 범위(20∼40kg/㎟)로 관리할 수 있다.In this slow cooling process, the winding coil is cooled through the temperature range around 730∼770 ℃, so that the austenite produced during hot rolling does not transform into martensite with high yield stress, but transforms into ferrite phase with low yield stress. Can be softened. In this way, when the coil is held at 770 to 730 ° C. for at least 5 minutes due to latent heat, the yield stress can be managed in the effective range (20 to 40 kg / mm 2) for cold rolling.

본 발명에서 코일을 2단 또는 3단으로 적치하여 소둔로에 장입하면 냉각속도를 서서히 조절할 수 있어 유리하다. 또한, 코일이 이송중에 시간이 지체되어 냉각이 많이 된 경우에는 바로 전에 작업하여 냉각이 되지 않은 상소둔로를 사용하면 온도의 상승효과를 기대할 수 있다.In the present invention, when the coil is loaded in two or three stages and charged into the annealing furnace, the cooling rate may be gradually adjusted. In addition, when the coil is delayed during the transfer and the cooling is much, the temperature increase effect can be expected by using the annealing furnace that is not cooled by working immediately before.

본 발명에서는 권취코일을 내부잠열에 의해 소둔하여 재질을 연화되도록 하는 것으로, 상소둔로 이외에 대기와의 접촉을 차단하여 보열냉각 할 수 있는 수단 즉, 로(furnace)에는 그 적용이 가능하다.In the present invention, the winding coil is annealed by the latent heat to soften the material, and in addition to the ordinary annealing furnace, it can be applied to a means capable of heat-cooling by blocking contact with the atmosphere.

이하, 본 발명을 실시예를 통하여 구체적으로 설명한다.Hereinafter, the present invention will be described in detail through examples.

[실시예]EXAMPLE

중량%로, Cr:11∼13%, C+N:0.02∼0.035%, Si:1%이하, Mn:1.0%이하를 만족하는 페라이트계 스테인레스강 슬라브를 500℃이상의 온도에서 권취한 다음에 바로 상소둔로에 장입하고 2단 적치하여 보열커버를 덮었다. 이때, 상소둔로에서 냉각패턴에 따른 항복응력을 도 4에 나타내었다.By weight, ferritic stainless steel slabs satisfying Cr: 11 to 13%, C + N: 0.02 to 0.035%, Si: 1% or less, and Mn: 1.0% or less are wound immediately at a temperature of 500 ° C or more. Charged into an annealing furnace and placed in two stages to cover the thermal cover. At this time, the yield stress according to the cooling pattern in the annealing furnace is shown in FIG.

도 4에서 알 수 있듯이, 장시간 소둔하지 않더라도 권취된 코일을 바로 소둔로에 장입하여 내부잠열에 의해 730∼770℃의 온도구간에서 5분이상 유지되도록 하면 목표로 하는 항복응력을 갖도록 할 수 있었다.As can be seen in Figure 4, even if not annealed for a long time, if the coil is wound directly in the annealing furnace to maintain at least 5 minutes in the temperature range of 730 ~ 770 ℃ by the latent heat to have the desired yield stress.

상술한 바와 같이, 열에너지 다소비공정인 상소둔공정을 간략화하여 열간압연에서 소둔완료까지의 총 4∼5일 소요되는 것을 2일 이하로 단축시킬 수 있으며, 상소둔시에 소요되는 에너지 절약이 가능한 유용한 효과가 있는 것이다.As described above, it is possible to shorten the total annealing process, which is a somewhat energy-saving process of heat energy, to shorten the total 4 to 5 days from hot rolling to the completion of annealing to 2 days or less, and to save energy required during the annealing process. It has a useful effect.

Claims (4)

페라이트계 스테인레스 강을 열간압연하고, 800℃이상의 온도에서 열연코일로 권취하는 단계;Hot-rolling the ferritic stainless steel and winding the hot-rolled coil at a temperature of 800 ° C. or higher; 상기 권취직후 열연코일을 상소둔로에 장입하는 단계;Charging the hot rolled coil immediately after the winding into an furnace annealing furnace; 이어 상소둔로의 보열커버를 덮어 코일의 잠열에 의해 열연코일을 소둔하는 단계;를 포함하여 이루어지는 페라이트계 스테인레스 열연강판의 제조방법.And covering the thermal cover of the annealing furnace to anneal the hot rolled coil by latent heat of the coil. 제 1항에 있어서, 상기 페라이트계 스테인레스강은 Cr:11∼13중량%이고, C+N:0.02∼0.035%을 만족함을 특징으로 하는 열연강판의 제조방법.The method of claim 1, wherein the ferritic stainless steel is Cr: 11 to 13% by weight, C + N: 0.02 to 0.035% of the method for producing a hot rolled steel sheet characterized in that. 제 1항에 있어서, 상기 열연코일은 상소둔로에 2단 또는 3단으로 적치하여 소둔함을 특징으로 하는 페라이트계 스테인레스 열연강판의 제조방법.The method of claim 1, wherein the hot rolled coil is placed in an annealing furnace in two or three stages and annealed. 제 1항 내지 제 3항중 어느 하나의 항에 있어서, 상기 소둔은 열연코일의 잠열에 의한 소둔과정에서 730∼770℃의 온도범위에서 5분이상 유지됨을 특징으로 하는 페라이트계 스테인레스 열연강판의 제조방법.The method of claim 1, wherein the annealing is maintained for at least 5 minutes in a temperature range of 730 to 770 ° C. during annealing by latent heat of the hot rolled coil. .
KR1020000019190A 2000-04-12 2000-04-12 Method for manufacturing ferritic stainless hot rolled steel sheet KR20010095809A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020001398A (en) * 2000-06-28 2002-01-09 이구택 Method for batch annealing fe-cr stainless steel coil
CN114214485A (en) * 2021-11-29 2022-03-22 辽宁石源科技有限公司 One-fire hot charging heat treatment process for ferrite stainless steel hot-rolled plate

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Publication number Priority date Publication date Assignee Title
JPS56119726A (en) * 1980-02-27 1981-09-19 Nisshin Steel Co Ltd Manufacture of hot rolled steel strip of ferrite stainless steel
JPS60110816A (en) * 1983-11-17 1985-06-17 Nippon Steel Corp Softening method of hot rolled steel strip
JPS60125329A (en) * 1983-12-07 1985-07-04 Kawasaki Steel Corp Production of hot rolled steel strip
JPS6160829A (en) * 1984-09-03 1986-03-28 Mitsubishi Heavy Ind Ltd Coil annealing method
KR20000042517A (en) * 1998-12-26 2000-07-15 이구택 Method for producing stainless hot rolled strip containing 11 to 13wt% of chrome

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56119726A (en) * 1980-02-27 1981-09-19 Nisshin Steel Co Ltd Manufacture of hot rolled steel strip of ferrite stainless steel
JPS60110816A (en) * 1983-11-17 1985-06-17 Nippon Steel Corp Softening method of hot rolled steel strip
JPS60125329A (en) * 1983-12-07 1985-07-04 Kawasaki Steel Corp Production of hot rolled steel strip
JPS6160829A (en) * 1984-09-03 1986-03-28 Mitsubishi Heavy Ind Ltd Coil annealing method
KR20000042517A (en) * 1998-12-26 2000-07-15 이구택 Method for producing stainless hot rolled strip containing 11 to 13wt% of chrome

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020001398A (en) * 2000-06-28 2002-01-09 이구택 Method for batch annealing fe-cr stainless steel coil
CN114214485A (en) * 2021-11-29 2022-03-22 辽宁石源科技有限公司 One-fire hot charging heat treatment process for ferrite stainless steel hot-rolled plate

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