KR20100052061A - Continuous casting method for reducing width deviation of ferritic stainless steel last-slab - Google Patents

Continuous casting method for reducing width deviation of ferritic stainless steel last-slab Download PDF

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KR20100052061A
KR20100052061A KR1020080110926A KR20080110926A KR20100052061A KR 20100052061 A KR20100052061 A KR 20100052061A KR 1020080110926 A KR1020080110926 A KR 1020080110926A KR 20080110926 A KR20080110926 A KR 20080110926A KR 20100052061 A KR20100052061 A KR 20100052061A
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continuous casting
cast
speed
width deviation
slab
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KR1020080110926A
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Korean (ko)
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KR100986931B1 (en
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최자용
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주식회사 포스코
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/002—Stainless steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/005—Manufacture of stainless steel

Abstract

PURPOSE: A continuous casting method for reducing width deviation of ferrite stainless steel last-slab is provided to reduce the failure rate of products by reducing the width deviation of ferrite stainless steel last-slab in a continuous casting process. CONSTITUTION: A de-slagging process is performed by inserting molten steel into a mold after passing through a ladle-tundish. The word slab is out drawn. The speed of the de-slagging is identically set with the normality shaft speed of the continuous casting. The output speed of the word slab controls to the normality shaft speed comparison 103~120% range of the continuous casting.

Description

페라이트계 스테인리스강의 말주편 폭편차 저감을 위한 연속주조 방법{Continuous casting method for reducing width deviation of ferritic stainless steel last-slab}Continuous casting method for reducing the width deviation of the cast iron of ferritic stainless steel

본 발명은 페라이트계 스테인리스강의 연속주조방법에 관한 것으로, 보다 상세하게는 연속주조말기에 몰드 슬래그 제거시의 주속(이하, 디슬래깅 주속이라 함) 및 말주편의 인출속도 제어를 통하여 말주편의 폭편차를 저감함으로써, 열연코일에서의 제품 폭부족으로 인한 불량을 저감하는 연속주조방법에 관한 것이다.The present invention relates to a continuous casting method of ferritic stainless steel, and more particularly, the width deviation of the cast iron through the control of the casting speed (hereinafter referred to as deslagging casting speed) and the drawing speed of the casting piece during the removal of mold slag at the end of the continuous casting. The present invention relates to a continuous casting method for reducing defects due to lack of product width in a hot rolled coil.

일반적으로 열간압연 공정에서 폭압연에 따른 슬라브 에지 결함은 연주주편에서 비롯되는 것으로서, 최종제품의 폭에 비해 연주주편 폭이 과다하게 큰 경우에는 슬라브 에지 결함의 폭방향 깊이가 증가하는 문제가 발생한다. 이후 슬리팅 (slitting) 공정을 거치는데, 상기 공정을 거치더라도 최종제품에는 결함이 잔존하게 된다.In general, the slab edge defects due to the width rolling in the hot rolling process originate from the cast steel, and when the width of the cast steel is excessively large compared to the width of the final product, there is a problem that the width depth of the slab edge defect increases. . Thereafter, a slitting process is performed, and even though the slitting process is performed, defects remain in the final product.

반대로 최종제품의 폭에 비해 연주주편 폭이 과다하게 작은 경우에는 열간압연공정에서의 폭퍼짐으로도 상쇄되지 못하여, 최종적으로 제품의 폭이 부족하게 되 는 문제가 발생한다.On the contrary, if the width of the cast steel is excessively small compared to the width of the final product, it cannot be offset by the width spread in the hot rolling process, resulting in a problem that the width of the product is finally insufficient.

이러한 문제를 해결하기 위한 종래의 공지기술에서는 연속주조시 몰드의 폭가변을 통해 주편폭을 조절함으로써 이를 해결하고 있으나, 폭가변 설비가 없는 곳에서는 이러한 기술을 적용할 수 없는 문제점을 가지고 있다. Conventional known techniques for solving this problem have been solved by adjusting the width of the slab through the variable width of the mold during continuous casting, but there is a problem that can not be applied to this technique where there is no variable width equipment.

또한, 주편 상/하면 폭편차를 저감하기 위해 몰드의 단변부 형상을 변경하는 방법이 제시되고 있으나, 이러한 기술 또한 주편의 길이방향 폭편차와는 다른 개념인 것이다. In addition, a method of changing the shape of the short side of the mold in order to reduce the width deviation on the upper and lower surfaces of the cast is proposed, but this technique is also a concept different from the longitudinal width deviation of the cast.

즉, 연속주조초기 말주편의 폭편차 저감을 위한 본 발명은 폭가변 설비 없이도 말주편의 폭편차를 최소화하기 위한 연주조건의 제어방법을 제시하는 것으로서, 이와 관련된 특허는 아직 보고되고 있지 않다. That is, the present invention for reducing the width deviation of the initial cast of the continuous casting is to propose a method of controlling the play conditions for minimizing the width deviation of the cast iron without the width variable equipment, the related patents have not been reported yet.

참고로, 여기서 주편폭편차라 함은 실제주편폭과 지시주편폭과의 차이를 의미하며, 초주편은 연속주조를 시작하여 처음 주조되는 주편을 의미하는 것으로, 초주편 이후 주조되는 주편들을 중주편, 그리고 연속주조를 시작하여 마지막으로 주조되는 주편을 말주편이라고 정의할 수 있다. For reference, the slab width deviation means the difference between the actual slab width and the indicated slab width, and the ultra slab means the slab that is first cast after the continuous casting, and the slabs cast after the slab are cast. In addition, the last cast can be defined as a horse cast by starting continuous casting.

본 발명은 상기한 종래의 문제점을 개선하기 위한 것으로, 연속주조공정에서 몰드의 폭가변 설비 없이도 연속주조말기 디슬래깅 주속 및 말주편의 인출속도 제어를 통하여 말주편의 폭편차를 저감함으로써, 열연코일에서의 폭부족으로 인한 제품 불량을 저감할 수 있는 페라이트계 스테인리스강의 연속주조방법을 제공하는데, 그 목적이 있다.The present invention is to improve the above-mentioned problems, in the continuous casting process, by reducing the width deviation of the horse cast through the deslagging circumferential speed of the continuous casting end and the drawing speed of the casting piece without the need to change the width of the mold, in the hot rolled coil It is an object of the present invention to provide a continuous casting method of ferritic stainless steel, which can reduce product defects due to lack of width.

상기 목적을 달성하기 위한 본 발명의 연속주조방법은, 연속주조말기 말주편을 주조하기 위하여 레이들-턴디시를 거쳐 몰드로 용강이 유입된 후 디슬래깅 및 말주편의 인출공정을 포함하는 페라이트계 스테인리스강의 연속주조 방법에 있어서, The continuous casting method of the present invention for achieving the above object, the ferrite system including the process of deslag and take out the cast after the molten steel flows into the mold through the ladle-tundish to cast the end cast of the continuous casting In the continuous casting method of stainless steel,

상기 디슬래깅의 주속은 연속주조의 정상주속과 동일하게 하고, 말주편의 인출속도는 연속주조의 정상주속 대비 103~120% 범위로 제어하는 것을 포함하는 것이다.The casting speed of the deslag is the same as the normal casting speed of the continuous casting, the withdrawal speed of the horse cast includes controlling to 103 ~ 120% range compared to the normal casting speed of the continuous casting.

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

본 발명자는 열연코일에서의 폭부족으로 인한 제품 불량을 유발하는 연속주조말기 말주편의 폭감소 현상을 억제하기 위한 방안을 모색하던 중 연속주조말기 디슬래깅 주속 및 말주편의 인출속도를 적절히 제어하면, 말주편의 응고셀 강도를 약화시킴에 따라 말주편의 폭팽창을 유도시켜 말주편에서 폭감소 현상을 억제할 수 있다는 것을 규명한 것이다.The inventors of the present invention seeks to reduce the phenomena of the reduction of the end casting of the end casting, which causes product defects due to the shortage of the hot rolled coil. As the coagulation cell strength of the cast iron is weakened, the expansion of the cast iron can be induced to suppress the decrease in the width of the cast iron.

먼저, 도 1은 스테인리스강 연속주조장치의 개략도를 나타낸 것으로, 본 발명은 통상의 연속주조방법에 따라 레이들(1)-턴디시(2)를 거쳐 몰드(5)로 용강(4)이 유입되고, 몰드(5)내에서는 응고가 시작되면 응고셀이 형성되며 이후 2차냉각대(7) 하부로 갈수록 응고셀이 두꺼워져 최종적으로 응고가 완료되어 주편(8)이 얻어질 수 있는 것이다.First, Figure 1 shows a schematic diagram of a stainless steel continuous casting apparatus, the present invention is the molten steel 4 is introduced into the mold (5) through the ladle (1)-tundish (2) according to the conventional continuous casting method When the solidification starts in the mold 5, a solidification cell is formed, and then the solidification cell becomes thicker toward the lower side of the secondary cooling stand 7 so that the solidification is finally completed, and thus, the cast piece 8 may be obtained.

이때, 강의 응고시에는 온도하락에 따른 부피수축이 일어나게 되며, 이에 따라 주편폭은 감소하게 된다. 그러나 응고셀이 약한 상부에서는 고열에 의해 주편 자체에서 발생되는 철정압(6)에 의해 온도하락에 따른 부피수축량이 감소하게 되고, 심한 경우에는 몰드의 폭보다 더 팽창하게 되는 경우도 발생하게 된다. At this time, when the steel solidifies, volume shrinkage occurs due to a temperature drop, thereby reducing the width of the cast steel. However, when the coagulation cell is weak, the amount of shrinkage due to temperature drop is reduced by the iron static pressure 6 generated in the cast itself by high heat, and in some cases, the expansion occurs more than the width of the mold.

결과적으로, 최종 연주주편의 폭은 철정압과 온도하락에 따른 부피수축의 상호작용에 의해 결정되는 것으로, 일반적으로 연주주편에서 조업조건의 변동이 없는 한 주편의 폭변화는 거의 일어나지 않게 되므로, 폭수축 보정계수의 조정을 통해 폭편차가 작은 주편을 생산할 수 있다. As a result, the width of the final cast steel is determined by the interaction between the iron static pressure and the volume shrinkage due to the temperature drop. By adjusting the shrinkage correction factor, it is possible to produce casts with small width deviations.

그러나 도 2에서 알 수 있듯이, 말주편에서는 주편길이 방향에 따라 폭편차 가 달라지는 것을 확인할 수 있다. 이를 상세히 살펴보면, 말주편의 헤드부(Head)는 정상폭임에 반해 말주편의 테일부(Tail)에서는 정상폭에 비해 폭이 현격히 감소하는 것을 알 수 있다.However, as can be seen in Figure 2, it can be seen that the width deviation varies depending on the length of the cast iron in the cast. Looking at this in detail, it can be seen that the head portion (Head) of the horse cast, while the tail portion (Tail) of the horse cast is significantly reduced in width compared to the normal width.

도 3은 연속주조시 말주편의 주조상태 모식도를 나타낸 것으로서, 이러한 현상이 일어나는 원인은 도 3에 나타난 바와 같이, 말주편의 경우 중주편과 비교할 때, 연속주조가 종료됨에 따른 용강공급 중단으로 인하여 주편이 인출될수록 동일위치에서의 철정압이 중주편에 비해 감소된다. Figure 3 shows a schematic diagram of the casting state of the end cast during continuous casting, the cause of this phenomenon, as shown in Figure 3, compared with the middle cast in the case of the horse cast, the cast steel due to the interruption of the molten steel supply due to the end of the continuous casting As it withdraws, the iron static pressure at the same position decreases compared to the middle cast.

이러한 현상은 말주편 끝으로 갈수록 더욱 심화되며, 결과적으로 철정압 감소에 의한 주편 변형력이 감소되어 온도수축에 따른 폭수축 상쇄력이 약해지기 때문에 말주편에서 폭감소가 발생하는 것이다. This phenomenon is intensified toward the end of the cast iron, and as a result, a decrease in the deflection force due to the reduction of the static pressure decreases the width shrinkage offset force due to the temperature shrinkage, resulting in a width reduction in the cast iron.

또한, 연속주조 말기에는 말주편 끝부분의 응고를 위해 몰드 슬래그 제거작업이 이루어지는데, 이때의 주속 즉, 디슬래깅 주속은 정상주속 대비 낮게 실시하게 되고 이에 따라 낮은 주속에 따른 응고셀 증가로 폭변형 저항성이 증대되어 중주편 대비 주편폭이 줄어들게 되는 것도 하나의 원인이다.In addition, at the end of continuous casting, mold slag removal is performed to solidify the end portion of the horse slab. At this time, the main slag, that is, the deslagging circumferential speed, is lower than the normal circumferential speed. Another reason is that the deformation resistance is increased and the width of the cast steel is reduced compared to the middle cast steel.

이에 본 발명에서는 페라이트계 스테인리스 강의 연속주조시 말주편의 폭감소 현상을 억제하기 위해, 즉 연속주조시 말주편의 폭팽창을 유도하기 위한 응고셀 강도 약화를 위하여 연속주조말기 디슬래깅 주속 및 말주편의 인출속도를 제어하는 것으로, 상기 디슬래깅의 주속은 연속주조의 정상주속과 동일하게 하고, 말주편의 인출속도는 연속주조의 정상주속 대비 103~120% 범위로 제어한다. Therefore, in the present invention, in order to suppress the width reduction of the end casting during continuous casting of ferritic stainless steel, that is, to reduce the strength of the solidification cell for inducing the expansion of the end casting during continuous casting, the end of continuous casting deslag speed and the end of the casting casting By controlling the speed, the deslagging circumferential speed is the same as the normal circumferential speed of continuous casting, and the withdrawal speed of the horse cast is controlled in the range of 103 to 120% of the normal circumferential speed of the continuous casting.

여기서, 말주편의 인출속도는 도 3에서 나타난 바와 같이, 연속주조말기 최종 용강이 몰드(5)를 빠져나간 후의 속도를 나타내는 것이며, 또한 본 발명의 디슬래깅 주속은 연속주조의 정상주속과 동일하게 하지만, 오차 범위 ±0.01m/min 를 허용할 수 있다. Here, as shown in Figure 3, the withdrawal speed of the cast slab represents the speed after the final molten steel at the end of the continuous casting exits the mold 5, and the deslagging peripheral speed of the present invention is the same as the normal peripheral speed of continuous casting However, error range ± 0.01m / min Can be allowed.

상기 디슬래깅 주속이 연속주조의 정상주속과 동일하지 않을 경우에는, 본 발명에서 목표로 하는 최대폭편차보다 커져 최종제품의 불량을 초래할 수 있다.If the deslagging circumferential speed is not the same as the normal circumferential speed of continuous casting, the deslagging circumferential speed may be greater than the maximum width deviation aimed at by the present invention, which may result in a failure of the final product.

또한, 상기 말주편의 인출속도는 연속주조의 정상주속 대비 103~120% 범위로 제어하는 것이다. 연속주조말기 말주편의 인출속도에 따라 최대폭편차는 2차함수적으로 변동하며, 이에 따라 폭편차를 최소화 할 수 있는 최적의 주편 인출속도가 존재하는 것을 알 수 있다. 이러한 결과를 바탕으로 말기 인출속도와 최대폭편차는 다음식과 같은 관계가 있는 것을 알 수 있다. In addition, the withdrawal speed of the horse cast is controlled in the range of 103 ~ 120% compared to the normal speed of the continuous casting. It can be seen that the maximum width deviation varies with the second function according to the withdrawal speed of the end of continuous casting, and therefore, there is an optimum casting speed with which the width deviation can be minimized. Based on these results, it can be seen that the final withdrawal speed and the maximum width deviation are related as follows.

[식 1][Equation 1]

최대폭편차 = -186.3(정상주속 대비 인출속도(%))2+ 414.4(정상주속대비 인 출속도(%))-244.1Maximum Width Deviation = -186.3 (drawal rate from normal speed (%)) 2 + 414.4 (drawal rate from normal speed) (%) -244.1

상기 식을 토대로 제품폭부족이 발생하지 않기 위한 최대폭편차 15mm를 만족하기 위해서 말주편의 인출속도는 연속주조의 정상주속 대비 103%~120%로 설정하여야 한다. 상기 인출속도가 103% 보다 낮거나 120%를 초과하는 경우에는, 상기 식 1에서 표현되는 최대폭편차값이 15mm를 초과하게 되어 최종제품의 불량을 초래할 수 있다.Based on the above formula, in order to satisfy the maximum width deviation of 15mm to avoid product shortage, the withdrawal speed of the cast iron should be set at 103% ~ 120% of the normal speed of continuous casting. When the withdrawal speed is lower than 103% or exceeds 120%, the maximum width deviation value expressed in Equation 1 may exceed 15 mm, which may cause a failure of the final product.

즉, 본 발명을 만족하는 연속주조말기 말주편의 최대폭편차는 최종제품의 불량을 초래하지 않는 범위인 15mm 이하로 제어되는 것이 바람직하다.That is, the maximum width deviation of the end cast of the end of continuous casting satisfying the present invention is preferably controlled to 15mm or less which is a range that does not cause the failure of the final product.

상술한 바와 같이, 본 발명에 따르면, 연속주조공정에서 몰드의 폭가변 설비 없이도 말주편의 폭편차를 저감하여 열연코일에서의 폭부족으로 인한 제품 불량이 개선된 페라이트계 스테인리스강을 제조할 수 있는 효과가 있다.As described above, according to the present invention, it is possible to manufacture ferritic stainless steel in which the product defects due to the shortage in the hot rolled coil are reduced by reducing the width deviation of the cast iron in the continuous casting process without the mold width changing equipment. There is.

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

[실시예 1]Example 1

11~13% 크롬을 함유하는 페라이트계 스테인리스강을 대상으로 연속주조말기 디슬래깅 작업시 연속주조의 정상주속과 정상주속 대비 78% 수준으로 하였을 경우 말주편의 폭편차를 측정하여 그 결과를 표 1 및 도 4에 나타내었다. 이때, 말주편 의 인출속도는 연속주조의 정상주속 대비 103~120% 범위로 하였다.In case of deslag work in the end of continuous casting of ferritic stainless steel containing 11 ~ 13% chromium, the width deviation of the end casting was measured when 78% of normal casting speed and continuous casting speed were measured. And FIG. 4. At this time, the withdrawal speed of the horse cast was in the range of 103 ~ 120% compared to the normal speed of continuous casting.

[표 1]TABLE 1

구분division 디슬래깅 주속
(정상주속대비%)Deslagging Speed
(% Of normal speed) 평균폭편차(mm)Average Width Deviation (mm) 최대폭편차(mm)Maximum Width Deviation (mm) 비교예 1Comparative Example 1 78%78% -7.5-7.5 -27-27 발명예 1Inventive Example 1 100%100% -3.6-3.6 -15-15

도 4는 도 4는 본 발명에 따른 말주편 디슬래깅 주속의 효과를 나타낸 그래프로서, 도 4 및 표 1에서 알 수 있듯이 말주편의 디슬래깅 주속이 정상주속대비 100%인 경우 본 발명에서 목표로 하는 최대폭편차를 만족하는 것을 잘 알 수 있다. Figure 4 is a graph showing the effect of the horse slag deslagging circumferential speed according to the present invention, as can be seen in Figure 4 and Table 1 the target in the present invention when the deslagging circumferential speed of the horse cast is 100% compared to the normal speed It can be seen that satisfies the maximum width deviation.

반면, 본 발명의 디슬래깅 주속을 만족하지 않는 비교예 1의 경우 최대폭편차가 -27mm를 나타내었고, 이는 최종제품의 불량을 가져올 수 있음을 알 수 있다.On the other hand, in the case of Comparative Example 1, which does not satisfy the deslagging circumferential speed of the present invention, the maximum width deviation was -27 mm, which may result in a defect of the final product.

[실시예 2][Example 2]

11~13% 크롬을 함유하는 페라이트계 스테인리스강을 대상으로 연속주조말기 말주편의 디슬래깅 작업시 기준주속을 연속주조의 정상주속과 동일하게 유지한 상태에서, 말주편의 인출속도를 기준주속의 89~133% 범위에서 변화시켜 말주편의 폭편차를 측정하여 그 결과를 도 5와 표 2에 나타내었다.In the case of deslag work of the end casting of the end casting of the continuous casting of ferritic stainless steel containing 11 to 13% chromium, the withdrawal speed of the end casting was set to 89 of the reference casting while maintaining the same reference speed as that of the continuous casting. The variation in the width of the cast steel was measured in the range of 133%, and the results are shown in FIGS. 5 and 2.

[표 2]TABLE 2

구분division 주편인출속도
(정상주속대비%)Cast Withdrawal Speed
(% Of normal speed) 평균폭편차(mm)Average Width Deviation (mm) 최대폭편차(mm)Maximum Width Deviation (mm) 비교예 2Comparative Example 2 89%89% -5.6-5.6 -21-21 비교예 3Comparative Example 3 100%100% -6.4-6.4 -21-21 발명예 2Inventory 2 111%111% -4.4-4.4 -13-13 발명예 3Inventory 3 111%111% -3.9-3.9 -11-11 발명예 4Inventive Example 4 111%111% -4.3-4.3 -13-13 비교예 4Comparative Example 4 122%122% -4.8-4.8 -16-16 비교예 5Comparative Example 5 133%133% -8.0-8.0 -23-23

도 5는 본 발명에 따른 말주편의 인출속도의 효과를 나타낸 그래프로서, 도 5 및 표 2에서 알 수 있듯이 말주편의 인출속도가 본 발명을 만족하는 발명예(2~4)의 경우에는 최대폭편차가 -11~-13mm로서, 본 발명에서 목표로 하는 최대폭편차 범위를 만족하였다. 5 is a graph showing the effect of the extraction speed of the cast steel according to the present invention, as shown in Figure 5 and Table 2, the maximum width deviation in the case of the invention example (2-4) that the extraction speed of the horse cast satisfies the present invention As -11 to -13 mm, the maximum width deviation range targeted in the present invention was satisfied.

그러나, 본 발명의 인출속도를 만족하지 않는 비교예(2~5)의 경우에는 최대폭편차가 -16~-23mm 범위를 나타내었고, 이는 최종제품의 불량을 가져올 수 있음을 알 수 있다.However, in the case of Comparative Examples (2 to 5) that do not satisfy the withdrawal speed of the present invention, the maximum width deviation was in the range of -16 to -23 mm, which may lead to the failure of the final product.

도 1은 연속주조장치의 개략도를 나타낸다.1 shows a schematic view of a continuous casting apparatus.

도 2는 연속주조 말주편 길이 방향에 따른 폭편차를 나타낸 그래프이다.Figure 2 is a graph showing the width deviation along the longitudinal direction of the continuous casting end cast.

도 3은 연속주조시 말주편의 주조상태 모식도를 나타낸다.Figure 3 shows a schematic view of the casting state of the end cast during continuous casting.

도 4는 본 발명에 따른 말주편 디슬래깅 주속의 효과를 나타낸 그래프이다.Figure 4 is a graph showing the effect of the horse slag deslag circumferential speed in accordance with the present invention.

도 5는 본 발명에 따른 말주편의 인출속도의 효과를 나타낸 그래프이다.5 is a graph showing the effect of the withdrawal speed of the horse cast according to the present invention.

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

1: 레이들 2: 턴디시1: ladle 2: tundish

3: 침지노즐 4: 용강3: immersion nozzle 4: molten steel

5: 몰드 6: 철정압5: mold 6: iron positive pressure

7: 2차냉각대 8: 주편7: 2nd cooling stand 8: cast

Claims (2)

연속주조말기 말주편을 주조하기 위하여 레이들-턴디시를 거쳐 몰드로 용강이 유입된 후 디슬래깅 및 말주편의 인출공정을 포함하는 페라이트계 스테인리스강의 연속주조 방법에 있어서, In the continuous casting method of ferritic stainless steel, including molten steel flows into the mold through a ladle-tundish to cast the end cast of the end of continuous casting, and the process of drawing out the cast slab, 상기 디슬래깅의 주속은 연속주조의 정상주속과 동일하게 하고, 말주편의 인출속도는 연속주조의 정상주속 대비 103~120% 범위로 제어하는 것을 포함하는 페라이트계 스테인리스강의 말주편 폭편차 저감을 위한 연속주조 방법.The casting speed of the deslag is the same as the normal speed of continuous casting, the withdrawal speed of the horse cast to reduce the width deviation of the cast steel of the ferritic stainless steel, including controlling the range of 103 ~ 120% compared to the normal casting of continuous casting Continuous casting method. 제 1항에 있어서, 상기 말주편의 최대폭편차는 하기 식 1에서 표현되는 최대폭편차값이 15mm 이하인 것을 특징으로 하는 페라이트계 스테인리스강의 말주편 폭편차 저감을 위한 연속주조 방법.The continuous casting method of claim 1, wherein the maximum width deviation of the cast steel has a maximum width deviation value of 15 mm or less represented by Equation 1 below. [식 1][Equation 1] 최대폭편차 = -186.3(정상주속 대비 인출속도(%))2+ 414.4(정상주속대비 인출속도(%))-244.1Maximum Width Deviation = -186.3 (drawal rate from normal speed (%)) 2 + 414.4 (drawal rate from normal speed) (%) -244.1
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CN102847901A (en) * 2011-06-28 2013-01-02 宝山钢铁股份有限公司 Method for controlling width of ferrite stainless steel plate blank in continuous casting production

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JPS61232049A (en) 1985-04-09 1986-10-16 Nippon Steel Corp Method for controlling continuously cast ingot to specified width
JPS62199253A (en) 1986-02-27 1987-09-02 Nippon Steel Corp Constant width controlling method for continuous casting slab
JP3425259B2 (en) * 1995-03-22 2003-07-14 新日本製鐵株式会社 Slab width control method in continuous casting

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102847901A (en) * 2011-06-28 2013-01-02 宝山钢铁股份有限公司 Method for controlling width of ferrite stainless steel plate blank in continuous casting production

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