KR100490987B1 - Mold flux for manufacturing high carbon steel - Google Patents

Mold flux for manufacturing high carbon steel Download PDF

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Publication number
KR100490987B1
KR100490987B1 KR10-2000-0073224A KR20000073224A KR100490987B1 KR 100490987 B1 KR100490987 B1 KR 100490987B1 KR 20000073224 A KR20000073224 A KR 20000073224A KR 100490987 B1 KR100490987 B1 KR 100490987B1
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mold flux
high carbon
mold
flux
present
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KR10-2000-0073224A
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KR20020044234A (en
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이성욱
고재윤
양대욱
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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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

본 발명은 고탄소강 제조용 몰드 플럭스(mold flux)에 관한 것이며; 그 목적은 상대적으로 응고시 몰드내 응고셀의 두께가 상대적으로 얇은 고탄소 공구강의 연속주조시 그 소모량을 충분히 확보하여 구속성 주편터짐(break-out)을 줄이는데 있다.The present invention relates to mold flux for producing high carbon steels; The purpose is to reduce the constrained break-out by sufficiently securing the consumption during continuous casting of the relatively high thickness of high carbon tool steel during the solidification of the solidification cell in the mold.

본 발명의 몰드 플럭스는, 중량%로, CaO : 25-40%, SiO2 : 25-40%, Al2O3 : 1-3%, Na2O : 17-22%, F : 10-15%, free [C] : 1-5%, 및 나머지는 기타 불순성분으로 구성된다.The mold flux of the present invention, in weight percent, CaO: 25-40%, SiO 2 : 25-40%, Al 2 O 3 : 1-3%, Na 2 O: 17-22%, F: 10-15 %, free [C]: 1-5%, and the remainder consisting of other impurities.

Description

고탄소강 제조용 몰드 플럭스{MOLD FLUX FOR MANUFACTURING HIGH CARBON STEEL}MOLD FLUX FOR MANUFACTURING HIGH CARBON STEEL}

본 발명은 몰드 플럭스(mold flux)에 관한 것으로, 보다 상세하게는 고탄소강 슬라브를 연속주조할 때 사용하는 몰드 플럭스에 관한 것이다.The present invention relates to a mold flux, and more particularly to a mold flux used for continuous casting of high carbon steel slab.

고탄소 공구강은 C성분이 중량%로 0.80-0.90%로 냉간압연후 열처리를 실시하는 표면 고경도 제품으로서 줄자, 시계태엽, 면도날 및 자동차 부품 등에 주로 사용되는 고부가 가치 제품이다. 금속학적인 특징으로는 일반적인 Fe-C 상태도에서도 알 수 있듯이, 고탄소 공구강은 과공석강이며, 열간압연후 인장강도가 90-100kgf/㎟, 항복강도가 35-65kgf/㎟, 연신율이 10% 수준인 고강도재로서 최종제품 가공후 수중 또는 유중 소입을 실시하여 표면강도를 얻으며, 강한 경화능으로 압축응력을 잔존시켜 공구의 구부러짐 현상과 뒤틀림 현상 등을 방지한다는 특징이 있다. High carbon tool steel is a surface hardened product that undergoes heat treatment after cold rolling at 0.80-0.90% by weight of C component, and is a high value-added product mainly used for tape measure, clockwork, razor blade and automobile parts. As can be seen from the general Fe-C state diagram, the high carbon tool steel is over-vacuum steel, the tensile strength is 90-100kgf / mm2, the yield strength is 35-65kgf / mm2, and the elongation is 10% after hot rolling. As a high strength phosphor, it is quenched in water or in water after processing the final product to obtain surface strength, and it has a feature of preventing bending and warping of tools by remaining compressive stress with strong hardening ability.

일반적으로 연속주조기를 통해 주조되는 고탄소 공구강과 같은 고탄소강은 그 제조상 다음과 같은 문제가 있다. 즉, 일반적인 Fe-C 상태에서도 알 수 있듯이, 강중 C의 함량이 증가함에 따라서 고상선 온도가 낮아짐과 동시에 고액공존 구간이 넓어지게 된다. In general, high carbon steel such as high carbon tool steel cast through a continuous casting machine has the following problems in its manufacture. That is, as can be seen in the general Fe-C state, as the content of steel C increases, the solidus temperature decreases and the solid-liquid coexistence section becomes wider.

이러한 고탄소강의 응고지연 현상으로 인하여 수냉되는 몰드와 접촉된 표면만이 응고되어 응고셀(solidification shell)의 두께가 얇아지게 된다. 이에 따라 상대적으로 응고셀과 몰드간의 마찰에 의해 응고셀이 파단되면서 구속성 주편터짐(break-out)이 발생되기 쉽다. 연주과정에서는 이 구속성 주편터짐을 막기 위해 윤활제로서 분말 또는 과립 형상의 합성슬래그(slag)인 몰드 플럭스(mold flux)를 몰드 내의 용강 상부에 투입하게 된다. Due to the solidification delay phenomenon of the high carbon steel, only the surface in contact with the water-cooled mold is solidified, so that the thickness of the solidification shell becomes thin. Accordingly, as the coagulation cell breaks due to the friction between the coagulation cell and the mold, restrictive break-out is likely to occur. In the playing process, a mold flux, which is a synthetic slag in the form of powder or granules, is injected into the upper part of the molten steel in the mold in order to prevent the restraint cast slab.

한편, 슬라브 연주기에서의 고탄소 공구강 주조시 사용되는 종래의 몰드 플럭스는 다수 제안되어 있다. 그 대표적인 예로서 대한민국 특허 제113104호에는 슬라브 연주기의 구속성 주편터짐을 저감하기 위한 고탄소강용 몰드 플럭스가 개시되어 있다. 상기 특허에 개시된 몰드 플럭스는 중량%로, CaO : 25-40%, SiO2 : 25-40%, Al2O3 : 3-8%, Na2O : 7-13%, Ba2O5: 5-7%, F : 10-15%로 조성되는데, 이러한 종래의 몰드 플럭스는 염기도 (CaO/SiO2)가 0.95~0.97이고, 점도가 1.0~1.2 (poise, 1300℃)가 되도록 하여 윤활성을 확보하도록 선정되었다. 그러나, 이러한 몰드 플럭스는 열전달능 및 윤활능 미약으로 인하여, 응고되는 주편의 단위 중량 당 윤활작용에 의해 소모되는 몰드 플럭스 중량(이하, `소모량')이 확보가 되지 않는 문제가 있었다. 고탄소 공구강을 연주 작업할 때 몰드 내 플럭스의 소모량이 충분치 않을 경우 응고셀 파단에 의한 주편터짐이 발생할 가능성이 커지는 단점이 있다.On the other hand, a number of conventional mold fluxes used for high carbon tool steel casting in slab players are proposed. As a representative example, Korean Patent No. 113104 discloses a mold flux for high carbon steel for reducing the restraint cast slab of a slab player. The mold flux disclosed in this patent is in weight percent, CaO: 25-40%, SiO 2 : 25-40%, Al 2 O 3 : 3-8%, Na 2 O: 7-13%, Ba 2 O 5 : 5-7%, F: 10-15%, the conventional mold flux is such that the basicity (CaO / SiO 2 ) is 0.95 ~ 0.97, the viscosity is 1.0 ~ 1.2 (poise, 1300 ℃) lubricity Was chosen to secure. However, such mold flux has a problem that the mold flux weight (hereinafter referred to as 'consumption amount') consumed by the lubrication action per unit weight of the solidified slab cannot be secured due to the poor heat transfer and lubricity. When playing high-carbon tool steel, if the consumption of the flux in the mold is insufficient, there is a disadvantage that the cast slab caused by the coagulation cell breakage is likely to occur.

본 발명은 이와같은 종래의 문제점을 해결하고자 제안된 것으로서, 그 목적은 상대적으로 응고시 몰드내 응고셀의 두께가 상대적으로 얇은 고탄소 공구강의 연속주조시 그 소모량을 충분히 확보함과 동시에 구속성 주편터짐을 줄일 수 있는 몰드 플럭스를 제공하는데 있다.The present invention has been proposed to solve such a conventional problem, the object of which is to secure a sufficient amount during continuous casting of relatively high-carbon tool steel with a relatively thin thickness of the solidification cell in the mold during solidification, while constraining cast iron burst It is to provide a mold flux that can be reduced.

상기 목적달성을 위한 본 발명은 연속주조시 사용되는 몰드 플럭스에 있어서, 중량%로, CaO : 25-40%, SiO2 : 25-40%, Al2O3 : 1-3%, Na2O : 17-22%, F : 10-15%, free [C] : 1-5%, 및 나머지는 기타 불순성분으로 구성되는 고탄소강 제조용 몰드 플럭스에 관한 것이다.The present invention for achieving the above object in the mold flux used during continuous casting, in weight%, CaO: 25-40%, SiO 2 : 25-40%, Al 2 O 3 : 1-3%, Na 2 O : 17-22%, F: 10-15%, free [C]: 1-5%, and the rest relates to a mold flux for producing high carbon steel, which is composed of other impurities.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

우선, 본 발명의 몰드 플럭스는 종래의 몰드 플럭스와 달리, 플럭스의 점도를 하향화하여 충분한 윤활능을 확보하는데 특징이 있다. 더불어 본 발명의 몰드 플럭스는 플럭스의 용융점을 낮추어 줌으로써 용융 슬래그의 양을 증가시키고, 이에 따라 주편과 몰드간 슬래그 유입을 원활히 함에 특징이 있다.First, the mold flux of the present invention is characterized by lowering the viscosity of the flux and securing sufficient lubricating ability, unlike the conventional mold flux. In addition, the mold flux of the present invention is characterized by increasing the amount of molten slag by lowering the melting point of the flux, thereby smoothly flowing the slag between the cast and the mold.

이를 위해 본 발명의 몰드 플럭스는 종래의 몰드 플럭스에 비하여 Al2O3의 함량을 감소시키고, Na2O와 F의 함량을 증가시키는 것이 필요하다.To this end, the mold flux of the present invention needs to reduce the content of Al 2 O 3 and increase the content of Na 2 O and F as compared to the conventional mold flux.

이하, 본 발명의 몰드 플럭스의 성분조정을 한정하는 이유를 상세히 설명한다.Hereinafter, the reason for limiting the component adjustment of the mold flux of the present invention will be described in detail.

본 발명의 몰드 플럭스 중에 함유되는 CaO와 SiO2는 염기도 조정 성분으로서, CaO를 40% 초과하여 첨가하거나 SiO2를 25% 미만으로 첨가하는 경우 슬래그의 점도가 매우 떨어지므로 용강 내에 슬래그 유입이 과다해 지고, 반대로 CaO를 25% 미만으로 첨가하거나 SiO2를 40% 초과 첨가시에는 슬래그의 점도가 높아지게 되어 용강내 슬래그 유입이 곤란해지므로 몰드와 응고쉘의 윤활능이 떨어져서 구속성 주편터짐의 가능성이 커지게 된다.CaO and SiO 2 contained in the mold flux of the present invention are basicity adjusting components, and when the CaO is added in excess of 40% or the SiO 2 is added in less than 25%, the viscosity of the slag is very low. On the contrary, when CaO is added less than 25% or SiO 2 is added more than 40%, the viscosity of slag becomes high, which makes it difficult to introduce slag into molten steel. do.

상기 Al2O3를 3% 초과 첨가시에는 점도 증가와 더불어 용강 내의 비금속개재물 흡수능이 저하되고, 1% 미만인 경우에는 슬래그의 Al2O3 흡수능력 과다로 인해 슬래그 점도가 과다하게 증가하여 윤활능이 저하된다.When the Al 2 O 3 is added more than 3%, the absorption of non-metallic inclusions in the molten steel is lowered, and when less than 1%, the slag viscosity is excessively increased due to the excessive absorption of Al 2 O 3 of the slag, so that the lubricity is increased. Degrades.

상기 Na2O를 17-22% 첨가하는 이유는 이 범위를 벗어갈 경우 몰드 플럭스의 용융점이 상승되어 원활한 슬래그 유입이 억제되기 때문이다. 특히, Na2O가 17% 미만 첨가될 경우 몰드 플럭스의 융제 기능이 저하되어 점도가 급격히 증가하게 된다.The reason why the Na 2 O is added in the range of 17-22% is that the melting point of the mold flux rises out of this range, so that smooth slag flow is suppressed. In particular, when Na 2 O is added less than 17%, the flux function of the mold flux is lowered and the viscosity is increased rapidly.

상기 F를 15% 초과 첨가시에는 슬래그의 결정질율이 과도하게 상승되어 몰드내 주편의 냉각속도가 저하되어 응고셀의 두께가 얇아지게 되어 구속성 주편터짐의 위험성이 커지게 된다. 10% 미만 첨가시에는 점도가 급격히 증가되어 윤활능이 저하된다. When F is added in excess of 15%, the slag crystallization rate is excessively increased, thereby decreasing the cooling rate of the slab in the mold, thereby reducing the thickness of the solidification cell, thereby increasing the risk of constrained slab burst. When less than 10% is added, the viscosity increases rapidly and the lubricating ability is lowered.

또한, free [C]을 1% 미만으로 첨가하면 몰드 내 용강 면의 보온성이 떨어져 슬래그 윤활능이 저하되고, 5%를 초과하여 함유되는 경우 몰드 플럭스의 용융속도가 느려져 주편과 몰드 사이에 원활한 슬래그 유입이 이루어지지 않는다.In addition, if free [C] is added below 1%, the slag lubrication performance is lowered due to the poor insulation of molten steel surface in the mold, and when it is contained in excess of 5%, the melt flux of the mold flux is slowed, so that smooth slag flows between the cast and the mold. This is not done.

한편, 본 발명의 몰드 플럭스는 그 점도를 0.1-0.2(poise, 1300℃)의 범위가 되도록 함이 바람직한데, 그 이유는 점도가 0.1미만인 경우에는 용강 내의 비금속개재물 흡수능이 급격히 저하되는 등 몰드 플럭스의 기능을 수행하지 못하게 되며, 0.2를 초과하는 경우에는 윤활능이 저하되어 적정한 소모량 확보가 되지 않는다.On the other hand, it is preferable that the mold flux of the present invention to have a viscosity in the range of 0.1-0.2 (poise, 1300 ℃), because if the viscosity is less than 0.1, the mold flux such as the absorption of the non-metallic inclusions in the molten steel is sharply lowered It will not be able to perform the function of, and if it exceeds 0.2, the lubrication capacity is lowered to ensure proper consumption.

본 발명의 몰드 플럭스는 고탄소강의 반제품 슬라브 제조에 적용되는데, 예를들면 중량%로, C: 0.80-0.90%, Si: 0.15-0.25%, Mn: 0.35-0.50%, P: 0.020%이하, S: 0.005%이하, 나머지 Fe 및 기타 불가피한 불순물로 이루어진 고탄소 공구강의 연속주조에 적용하면 보다 효과적이다. The mold flux of the present invention is applied to the production of semi-finished slabs of high carbon steel, for example, by weight, C: 0.80-0.90%, Si: 0.15-0.25%, Mn: 0.35-0.50%, P: 0.020% or less, S: 0.005% or less, more effective when applied to continuous casting of high carbon tool steel consisting of the remaining Fe and other unavoidable impurities.

이하, 본 발명을 실시예를 통하여 구체적으로 설명하지만, 본 발명은 하기 실시예로 국한되지 아니한다. 즉, 본 발명의 몰드 플럭스가 적용되는 강종은 실시예의 고탄소 공구강종으로 국한되지 않으며, 탄소량이 보다 많은 고탄소강에도 적용 가능함은 물론이다.Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to the following Examples. That is, the steel type to which the mold flux of the present invention is applied is not limited to the high carbon tool steel type of the embodiment, and of course, it is also applicable to high carbon steel having a higher carbon content.

[실시예]EXAMPLE

슬라브 연속주조기에서 0.70-1.05중량%의 탄소를 포함한 고탄소 공구강을 모두 동일한 주조조건으로 연속주조하였다. 이때, 몰드 플럭스로는 표1과 같은 조성을 갖는 제품을 투입하였다. 비교재 몰드 플럭스와 본 발명의 몰드 플럭스를 실제 슬라브 연주기에 적용하면서 소모량과 구속성 주편터짐 발생율을 비교한 결과를 표1에 함께 나타내었다. In the slab continuous casting machine, all high carbon tool steels including 0.70-1.05% by weight of carbon were continuously cast under the same casting conditions. At this time, a product having a composition as shown in Table 1 was added to the mold flux. Comparing the mold flux of the comparative material and the mold flux of the present invention to the actual slab player, the results of comparing the consumption rate and the restraint cast slab occurrence rate are shown in Table 1 together.

여기서, 구속성 주편터짐 발생율이란 래들단위 생산 챠지(charge)중 구속성 주편터짐 회수를 말한다.Here, the binding slab generation rate refers to the number of binding slab bursts during the production charge of the ladle unit.

구분division 화학조성(중량%)Chemical composition (% by weight) 점도(poise, 1300℃)Viscosity (1300 ℃) 결정질율(%)Crystallinity rate (%) 소모량(kg/T)Consumption (kg / T) 구속성 주편터짐발생율(%)Constrained cast rupture rate CaOCaO SiO2 SiO 2 Al2O3 Al 2 O 3 Na2ONa 2 O FF free[C]free [C] 기타Etc 비교재1Comparative Material 1 29.029.0 30.830.8 5.35.3 12.212.2 8.68.6 1.81.8 나머지Remainder 1.011.01 -- 0.200.20 4.54.5 비교재2Comparative Material 2 27.827.8 29.029.0 3.73.7 10.110.1 3.83.8 1.71.7 나머지Remainder 1.081.08 00 0.230.23 2.22.2 비교재3Comparative Material 3 27.827.8 29.029.0 2.62.6 9.99.9 10.010.0 1.81.8 나머지Remainder 0.290.29 00 0.320.32 1.31.3 비교재4Comparative Material 4 24.224.2 24.924.9 14.114.1 15.015.0 16.416.4 1.51.5 나머지Remainder 1.351.35 4.24.2 0.270.27 7.27.2 비교재5Comparative Material 5 24.124.1 24.724.7 8.48.4 24.324.3 7.37.3 0.70.7 나머지Remainder 0.430.43 3.23.2 0.340.34 0.90.9 비교재6Comparative Material 6 41.141.1 42.342.3 1.21.2 4.24.2 2.22.2 5.35.3 나머지Remainder 0.330.33 00 0.340.34 1.51.5 비교재7Comparative Material7 40.240.2 41.141.1 2.32.3 8.88.8 00 5.45.4 나머지Remainder 0.840.84 00 0.210.21 3.33.3 발명재1Invention 1 29.229.2 30.430.4 1.91.9 18.718.7 11.311.3 1.81.8 나머지Remainder 0.150.15 5.25.2 0.370.37 00 발명재2Invention 2 28.128.1 30.130.1 1.21.2 21.121.1 11.111.1 1.51.5 나머지Remainder 0.120.12 2.32.3 0.400.40 00 발명재3Invention 3 29.229.2 30.230.2 2.42.4 17.717.7 14.514.5 4.24.2 나머지Remainder 0.180.18 -- 0.360.36 00

실제 슬라브 연속주조기에서의 반복 시험 결과, 몰드 플럭스의 소모량과 구속성 주편터짐 발생율이 표1에서 보이는 것처럼, 본 발명의 조건 범위를 만족하는 발명재(1-3)를 사용할 때 크게 개선되었음을 확인할 수 있었다.As a result of repeated tests in the continuous slab casting machine, it was confirmed that the consumption of the mold flux and the incidence of restraint cast slab were greatly improved when the invention material (1-3) satisfying the condition range of the present invention was used. .

상술한 바와 같이, 본 발명의 몰드 플럭스는 주편과 몰드간의 마찰력을 감소시키는 윤활작용이 매우 우수하여, 특히 고탄소강 제조시 안정적 소모량이 확보되므로써 연속주조시 구속성 주편터짐 발생을 현저히 감소시키는 매우 유용한 효과가 있다.As described above, the mold flux of the present invention has a very good lubrication action to reduce the friction between the cast and the mold, in particular, a stable consumption in the production of high carbon steel is very useful effect to significantly reduce the occurrence of restraint cast slab during continuous casting There is.

Claims (3)

연속주조시 사용되는 몰드 플럭스에 있어서, 중량%로, CaO : 25-40%, SiO2 : 25-40%, Al2O3 : 1-3%, Na2O : 17-22%, F : 10-15%, free [C] : 1-5%, 및 나머지는 기타 불순성분으로 구성됨을 특징으로 하는 고탄소강 제조용 몰드 플럭스.In the mold flux used for continuous casting, in weight%, CaO: 25-40%, SiO 2 : 25-40%, Al 2 O 3 : 1-3%, Na 2 O: 17-22%, F: 10-15%, free [C]: 1-5%, and the remainder consists of other impurities, the mold flux for producing high carbon steels. 제1항에 있어서, The method of claim 1, 상기 몰드 플럭스는 점도가 0.1-0.2(poise, 1300℃)의 범위임을 특징으로 하는 고탄소강 제조용 몰드 플럭스. The mold flux is a mold flux for producing high carbon steel, characterized in that the viscosity is in the range of 0.1-0.2 (poise, 1300 ℃). 삭제delete
KR10-2000-0073224A 2000-12-05 2000-12-05 Mold flux for manufacturing high carbon steel KR100490987B1 (en)

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KR101313476B1 (en) * 2011-11-15 2013-10-01 주식회사 포스코 Mold flux for manufacturing high carbon steel
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Citations (8)

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KR950016970A (en) * 1993-12-29 1995-07-20 조말수 Mold casting for continuous casting with high crystallinity
KR950016963A (en) * 1993-12-28 1995-07-20 조말수 Billet Continuous Casting Mold Flux
KR960010124A (en) * 1994-09-15 1996-04-20 김만제 Mold Flux for High Carbon Steel to Reduce Strain Breakout in Slab Slabs
KR960010125A (en) * 1994-09-15 1996-04-20 김만제 Tundish flux for tundish hot reuse of aluminum-kilted steel
JPH08150455A (en) * 1994-11-24 1996-06-11 Sumitomo Metal Ind Ltd Low viscosity flux for centrifugal casting
JPH09323142A (en) * 1996-06-04 1997-12-16 Nippon Steel Metal Prod Co Ltd Flux for removing tundish slag and method for removing tundish slag
JPH105952A (en) * 1996-06-14 1998-01-13 Sumitomo Metal Ind Ltd Flux for continuous casting of steel
JP2000071051A (en) * 1998-08-31 2000-03-07 Nkk Corp Powder for continuous casting of steel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR950016963A (en) * 1993-12-28 1995-07-20 조말수 Billet Continuous Casting Mold Flux
KR950016970A (en) * 1993-12-29 1995-07-20 조말수 Mold casting for continuous casting with high crystallinity
KR960010124A (en) * 1994-09-15 1996-04-20 김만제 Mold Flux for High Carbon Steel to Reduce Strain Breakout in Slab Slabs
KR960010125A (en) * 1994-09-15 1996-04-20 김만제 Tundish flux for tundish hot reuse of aluminum-kilted steel
JPH08150455A (en) * 1994-11-24 1996-06-11 Sumitomo Metal Ind Ltd Low viscosity flux for centrifugal casting
JPH09323142A (en) * 1996-06-04 1997-12-16 Nippon Steel Metal Prod Co Ltd Flux for removing tundish slag and method for removing tundish slag
JPH105952A (en) * 1996-06-14 1998-01-13 Sumitomo Metal Ind Ltd Flux for continuous casting of steel
JP2000071051A (en) * 1998-08-31 2000-03-07 Nkk Corp Powder for continuous casting of steel

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