KR100398391B1 - A METHOD FOR MANUFACTURING HOT ROLLED STAINLESS STEEL CONTAINING 11-13% Cr - Google Patents

A METHOD FOR MANUFACTURING HOT ROLLED STAINLESS STEEL CONTAINING 11-13% Cr Download PDF

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KR100398391B1
KR100398391B1 KR10-1998-0058737A KR19980058737A KR100398391B1 KR 100398391 B1 KR100398391 B1 KR 100398391B1 KR 19980058737 A KR19980058737 A KR 19980058737A KR 100398391 B1 KR100398391 B1 KR 100398391B1
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hot rolled
coil
present
steel sheet
annealing
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KR10-1998-0058737A
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KR20000042517A (en
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우병성
전철
남지형
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주식회사 포스코
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263Modifying 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
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/002Heat treatment of ferrous alloys containing Cr
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273Final recrystallisation annealing
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/001Austenite

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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)
  • Heat Treatment Of Steel (AREA)

Abstract

본 발명은 11~13%의 크롬을 함유하고 티타늄 또는 니오븀을 미첨가한 스테인레스 열연강판의 제조방법에 관한 것으로, 그 목적은 연속소둔방법으로 제조하면서도 기존의 상소둔재에 비해 동등이상의 재질을 갖을 수 있는 열연강판의 제조방법을 제공함에 있다.The present invention relates to a method for manufacturing a stainless hot rolled steel sheet containing 11 to 13% of chromium and not adding titanium or niobium, and its object is to be manufactured by a continuous annealing method but may have a material equivalent to or higher than that of a conventional ordinary annealing material. The present invention provides a method for manufacturing a hot rolled steel sheet.

이러한 목적을 달성하기 위한 본 발명의 기술적인 구성은, 열간압연된 코일을 감는 권취온도를 고온으로 하여 공기중에서 냉각함으로써, 코일의 잠열을 방출하면서 서서히 750±20℃ 영역을 통과하도록 하여 재질을 연화시키고, 이때의 코일 냉각과정에서 코일의 내부 및 내,외권부 등의 위치별로 냉각속도가 다름에 따라 발생하는 재질편차를 줄이기 위하여 오스테나이트로 다시 역변태하는 770℃이하에서 연속소둔하여 열간압연판의 전장이 균일한 재질을 확보하는 것이다.The technical configuration of the present invention for achieving this object is to soften the material by gradually passing through the 750 ± 20 ℃ region while releasing the latent heat of the coil by cooling the air in the air at a high winding temperature winding the hot rolled coil In this case, the hot rolling plate is continuously annealed at 770 ℃ or lower, which is transformed back into austenite to reduce the material deviation caused by the different cooling speeds depending on the positions of the coil, the inner, the outer and the outer portion of the coil. The overall length of the to ensure a uniform material.

이러한 본 발명은 소둔시간을 현격히 단축할 수 있는 연속소둔방법에 의해 냉간압연에 적합한 열간압연판(항복응력:20-40kg/㎟)을 제공하는 유용한 기술이다.This invention is a useful technique of providing a hot rolled sheet (yield stress: 20-40 kg / mm 2) suitable for cold rolling by a continuous annealing method that can significantly reduce the annealing time.

Description

크롬을 11~13% 함유한 스테인레스 열연강판의 제조방법{A METHOD FOR MANUFACTURING HOT ROLLED STAINLESS STEEL CONTAINING 11-13% Cr}Manufacturing method of stainless hot rolled steel sheet containing 11 ~ 13% chromium {A METHOD FOR MANUFACTURING HOT ROLLED STAINLESS STEEL CONTAINING 11-13% Cr}

본 발명은 11~13%크롬을 함유하고 티타늄 또는 니오븀을 미첨가한 스테인레스 열연강판의 제조방법에 관한 것으로, 상세하게는 연속 소둔을 행하여 종래의 상소둔재와 동등이상의 재질을 갖는 열간압연판의 제조방법에 관한 것이다.The present invention relates to a method for producing a stainless hot rolled steel sheet containing 11-13% chromium and without adding titanium or niobium. Specifically, the present invention relates to the production of a hot rolled sheet having a material equivalent to or higher than that of a conventional ordinary annealing material. It is about a method.

스테인레스강중에 크롬을 11~13%함유한 강종의 열연강판은 열간압연에 의하여 잔류되는 마르텐사이트의 경화된 조직을 연화하기 위하여 도 1(a)에 도시된 바와 같이,열연 코일을 그대로 2단 또는 3단으로 적치하여 20시간정도 장시간 소둔을 하는 상소둔 방법으로 제조하고 있다.Hot rolled steel sheet of 11 ~ 13% of chromium in stainless steel is used as the two stages of hot rolled coil as it is shown in FIG. 1 (a) to soften the hardened structure of martensite remaining by hot rolling. It is produced by an annealing method in which it is loaded in three steps and annealed for about 20 hours for a long time.

이러한 상소둔방법으로 스테인레스 열연강판을 제조하면 열간압연 코일내부의 재질이 균일하여 냉간압연이 가능하다는 장점이 있으나, 장시간의 소둔이 요구되므로 비경제적이다. 물론, 연속소둔법을 적용하면 그 해결이 간단하나, 경질이면서도 재질의 편차를 가지는 열간압연판을 단시간에 행하는 연속소둔방법으로는 줄이기가 쉽지 않아 아직 그 해결방안이 제시되지 못하고 있는 실정이다.When manufacturing a stainless hot rolled steel sheet by such an annealing method has the advantage that the material inside the hot rolled coil is uniform, cold rolling is possible, but it is uneconomical because a long time annealing is required. Of course, if the continuous annealing method is applied, the solution is simple, but it is not easy to reduce the continuous annealing method of performing a hot rolled sheet having a hard and material deviation in a short time, the solution has not been proposed yet.

본 발명은 이러한 종래의 문제점을 해소하기 위하여 안출된 것으로, 그 목적은 크롬을 11-13% 함유한 스테인레스강을 연속소둔방법에 의하여 종래의 상소둔재와 동등이상의 재질을 갖는 열간압연강판을 제조할 수 있는 방법을 제공함에 있다.The present invention has been made to solve such a conventional problem, the object of the present invention is to produce a hot rolled steel sheet having a material equivalent to or more than the conventional annealing material by a continuous annealing method of stainless steel containing 11-13% chromium. It is to provide a way to.

도1은 스테인레스 열연강판의 제조공정도로서,1 is a manufacturing process diagram of a stainless hot rolled steel sheet,

도 1(a)는 상소둔에 의한 공정도(종래의 방법)1 (a) is a process chart by conventional annealing (conventional method)

도 1(b)는 연속소둔에 의한 공정도(본 발명의 방법)Figure 1 (b) is a process chart by the continuous annealing (method of the present invention)

도 2는 열간압연설비의 개략도2 is a schematic view of a hot rolling facility

도3은 열연스트립의 권취냉각 및 연속소둔시의 온도 및 시간의 변화곡선3 is a curve of change in temperature and time during winding cooling and continuous annealing of a hot rolled strip;

도4는 열연스트립의 소둔온도에 따른 항복응력의 변화를 나타내는 그래프Figure 4 is a graph showing the change in yield stress according to the annealing temperature of the hot rolled strip

상기의 목적을 달성하기 위한 본 발명의 스테인레스 열연강판 제조방법은, 중량%로, 크롬:11.0~13.0%, 실리콘:1.0%이하, 망간:1.0%이하 탄소: 0.010~0.020%, 질소:0.010~0.020%를 함유하고, 탄소와 질소의 합이 0.02~0.035%를 만족하는 강슬라브를 재가열하여 열간압연고, 고온권취한 다음, 연속소둔하는 것을 포함하여 구성된다.Stainless steel sheet production method of the present invention for achieving the above object, in weight%, chromium: 11.0 ~ 13.0%, silicon: 1.0% or less, manganese: 1.0% or less carbon: 0.010 ~ 0.020%, nitrogen: 0.010 ~ Steel slab containing 0.020% and having a sum of carbon and nitrogen of 0.02% to 0.035%, reheating, hot rolling, hot rolling, and continuous annealing.

이하, 본 발명을 도면을 참고하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the drawings.

본 발명의 대상강종은 크롬을 11-13% 함유하는 페라이트계 스테인레스강으로서, 주요성분으로는 중량%로, 실리콘:1.0%이하, 망간:1.0%이하 탄소: 0.010~0.020%, 질소:0.010~0.020%를 함유하고 있다. 바람직하게는 상기 탄소와 질소의 합이 200~350ppm 정도로 낮게 설정하는 것이 좋다. 이는 압연온도를 약 100℃정도(예를 들어, 1100℃에서 1000℃로) 낮출 수 있으며, 이 온도구역에서는 오스테나이트 양이 70~80%전후를 가진다.The target steel of the present invention is a ferritic stainless steel containing 11-13% of chromium, and the main component is weight%, silicon: 1.0% or less, manganese: 1.0% or less carbon: 0.010 to 0.020%, nitrogen: 0.010 to It contains 0.020%. Preferably, the sum of carbon and nitrogen is set to be low as about 200 ~ 350ppm. This can lower the rolling temperature by about 100 ° C. (eg, from 1100 ° C. to 1000 ° C.), in which the austenite content is around 70-80%.

상기와 같은 페라이트계 스테인레스강을 통상의 방법으로 열간압연하고, 이어 코일을 권취하는데, 이때 기존의 방법과 같이 수냉대(도 2)를 통과하면서 저온권취(700℃이하)하면 오스테나이트가 마르텐사이트로 변태되어 항복강도가 80kg/㎟로 매우 경화된 재질을 가진다. 이러한 연유로 종래에는 상소둔으로 장시간(20시간 소둔) 소둔하지 않으면 냉간압연이 곤란하였다.The ferritic stainless steel as described above is hot rolled by a conventional method, and then the coil is wound. At this time, when the low temperature winding (700 ° C or less) passes through the water cooling stand (Fig. 2) as in the conventional method, the austenitic martensite is Yield strength is 80kg / ㎜ very hardened to have a hardened material. For this reason, in the past, cold rolling was difficult unless it was annealed for a long time (20 hours) by ordinary annealing.

따라서, 본 발명에서는 고온권취하는데, 바람직하게는 800℃이상 보다 바람직하게는 800-900℃의 온도에서 권취한다. 이와 같이 고온권취하면 코일이 공냉시에 도 3에 나타난 바와 같이, 코일의 잠열에 의하여 서서히 냉각되면서 재질이 연화되는 750℃±20℃근처의 온도영역대를 통과하면서 재질이 연화되게 된다. 이에 따라 열간압연시 생성된 오스테나이트가 항복응력이 높은 마르텐사이트로 변태를 하지 않고 항복응력이 낮은 페라이트상으로 변태하므로서 재질을 연화할 수 있는 것이다.Therefore, in this invention, although winding at high temperature, Preferably it winds up at 800-900 degreeC more preferably 800 degreeC or more. As such, when the coil is wound at a high temperature, as shown in FIG. 3, the material is softened while passing through a temperature range near 750 ° C. ± 20 ° C. where the material is softened while gradually being cooled by latent heat of the coil. Accordingly, the austenite produced during hot rolling can soften the material by transforming it into a ferrite phase having a low yield stress without transforming into martensite having a high yield stress.

열연권취시 발생되는 마르텐사이트는 열간압연시 소재 합금 성분의 조합에 의하여생성된 오스테나이트에 의해 생성된 것이나, 탄소의 성분을 0.020%이하로 낮은 수준으로 제한하였기 때문에 권취하고 공냉하는 과정 또는 후술하는 연속소둔열처리과정에서 단시간에 분해가 되어 쉽게 재질의 연화를 도모할 수 있다.Martensite produced during hot rolling is produced by austenite produced by the combination of alloying materials during hot rolling, but is wound and air-cooled because it limits the carbon component to less than 0.020%. In the continuous annealing heat treatment, it can be decomposed in a short time, so that the material can be easily softened.

상기와 같이 고온권취한 다음 공냉하면 어느 정도 연화된 재질을 얻을 수는 있으나, 이 과정에서 권취코일의 외부와 내부의 위치별 냉각속도가 다르게 되어(도 3)코일 길이방향으로 재질을 측정하면 재질의 편차가 발생된다. 따라서, 이를 해결하기 위해서 열간압연판을 연속소둔하면 잔류된 마르텐사이트가 연질화된 페라이트로 분해되어 열간압연판의 전장이 균일한 재질을 얻을 수 있다. 이를 위한 최적의 연속소둔온도는 후술하는 실시예에서 확인할 수 있는 바와 같이, 730-770℃이다.If the air-cooled after the high temperature as described above to obtain a softened material to some extent, in this process the cooling speed for each position of the winding coil outside and inside is different (Fig. 3) If the material is measured in the coil length direction Deviation occurs. Therefore, in order to solve this problem, continuous hot annealing of the hot rolled sheet may decompose the remaining martensite into soft ferrite, thereby obtaining a uniform material of the hot rolled sheet. The optimum continuous annealing temperature for this is 730-770 ° C, as can be seen in the examples below.

이하, 본 발명을 실시예를 통하여 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

[실시예]EXAMPLE

중량%로, 크롬:11.3%, 실리콘:0.3%, 망간:0.8% 탄소: 0.015%, 질소:0.010%를 함유하는 강슬라브로 1000℃에서 압연을 종료하고 850℃(발명예)와 650℃에서 권취하면서 공냉(발명예의 경우 약 15분 소요)한 다음, 이 열연판을 500-800℃로 온도를 변화시키면서 5분동안 연속소둔하여 열간압연판을 제조한 다음, 이 연속소둔온도에 따른 열간압연판의 항복응력을 측정하고 그 결과를 도 4에 나타내었다.By steel slab containing chromium: 11.3%, silicon: 0.3%, manganese: 0.8% carbon: 0.015%, nitrogen: 0.010% by weight, the rolling was finished at 1000 ° C and at 850 ° C (invention) and 650 ° C. Air-cooled while winding (approximately 15 minutes in the case of the invention), and then the hot rolled sheet was continuously annealed for 5 minutes while changing the temperature to 500-800 ° C. to produce a hot rolled sheet, followed by hot rolling according to this continuous annealing temperature. The yield stress of the plate was measured and the results are shown in FIG. 4.

도 4에서 알 수 있듯이, 650℃로 저온권취한 열간압연판(소둔전)의 항복응력(점 A)은 80kg/㎟임을 알 수 있었다. 또한, 냉간압연에서 요구하는 목표수준이 항복응력(20-40kg/㎟)을 만족하는 최적의 연속소둔온도는 750±20℃임을 알 수 있었다.As can be seen in Figure 4, it was found that the yield stress (point A) of the hot rolled sheet (before annealing) cold wound at 650 ° C was 80kg / mm2. In addition, it was found that the optimum continuous annealing temperature at which the target level required for cold rolling satisfies the yield stress (20-40 kg / mm 2) was 750 ± 20 ° C.

도 4에서 B점은 페라이트에서 오스테나이트의 변태점을 의미한다.Point B in Figure 4 refers to the transformation point of austenite in the ferrite.

상술한 바와 같이, 본 발명은 연속소둔방법에 의해 코일의 길이방향으로 균일한 재질을 갖는 열간압연판을 제공할 수 있으며, 이에 따라 20시간 소요되는 기존의 상소둔 공정의 생략할 수 있는 유용한 효과가 있다.As described above, the present invention can provide a hot rolled plate having a uniform material in the longitudinal direction of the coil by the continuous annealing method, and thus a useful effect of omitting the existing ordinary annealing process that takes 20 hours. There is.

Claims (2)

중량%로, 크롬:11.0~13.0%, 실리콘:1.0%이하, 망간:1.0%이하, 탄소: 0.010~0.020%, 질소:0.010~0.020%, 상기 탄소와 질소의 합이 0.02~0.035%를 만족하는 강슬라브로 열연강판을 제조하는 방법에 있어서, 상기 강슬라브를 재가열하여 열간압연하고, 800~900℃의 온도범위에서 고온권취한 다음, 연속소둔하는 것을 특징으로 하는 크롬을 11-13%함유한 스테인레스 열연강판의 제조방법.By weight%, chromium: 11.0 ~ 13.0%, silicon: 1.0% or less, manganese: 1.0% or less, carbon: 0.010 ~ 0.020%, nitrogen: 0.010 ~ 0.020%, the sum of carbon and nitrogen satisfies 0.02 ~ 0.035% In the method for manufacturing a hot rolled steel sheet with a steel slab, the steel slab is reheated and hot rolled, wound at a high temperature in a temperature range of 800 to 900 ° C, and then continuously annealed to contain 11-13% of chromium. Method for producing a stainless hot rolled steel sheet. 제1항에 있어서, 상기 연속소둔은 730∼770℃의 온도에서 행하는 것을 특징으로 하는 크롬을 11-13%함유한 스테인레스 열연강판의 제조방법.The method for producing a stainless hot rolled steel sheet containing 11-13% of chromium according to claim 1, wherein the continuous annealing is performed at a temperature of 730 to 770 ° C.
KR10-1998-0058737A 1998-12-26 1998-12-26 A METHOD FOR MANUFACTURING HOT ROLLED STAINLESS STEEL CONTAINING 11-13% Cr KR100398391B1 (en)

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KR101126927B1 (en) * 2004-12-27 2012-03-20 주식회사 포스코 Method for manufacturing martensitic stainless steel

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KR20010095809A (en) * 2000-04-12 2001-11-07 이구택 Method for manufacturing ferritic stainless hot rolled steel sheet

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JPS54112319A (en) * 1978-02-23 1979-09-03 Sumitomo Metal Ind Ltd Heat resistant ferritic stainless steel with superior press formability and manufacture thereof
JPH02258931A (en) * 1989-03-29 1990-10-19 Nippon Steel Corp Production of cr stainless steel sheet by thin-wall casting method
JP2002030345A (en) * 2000-07-13 2002-01-31 Nippon Steel Corp Method for producing ferritic stainless steel sheet excellent in high temperature strength and magnetic property

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JPS54112319A (en) * 1978-02-23 1979-09-03 Sumitomo Metal Ind Ltd Heat resistant ferritic stainless steel with superior press formability and manufacture thereof
JPH02258931A (en) * 1989-03-29 1990-10-19 Nippon Steel Corp Production of cr stainless steel sheet by thin-wall casting method
JP2002030345A (en) * 2000-07-13 2002-01-31 Nippon Steel Corp Method for producing ferritic stainless steel sheet excellent in high temperature strength and magnetic property

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101126927B1 (en) * 2004-12-27 2012-03-20 주식회사 포스코 Method for manufacturing martensitic stainless steel

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