KR20020001452A - A method for manufacturing stainless steel slabs reducing m type sliver defect - Google Patents

A method for manufacturing stainless steel slabs reducing m type sliver defect Download PDF

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KR20020001452A
KR20020001452A KR1020000036193A KR20000036193A KR20020001452A KR 20020001452 A KR20020001452 A KR 20020001452A KR 1020000036193 A KR1020000036193 A KR 1020000036193A KR 20000036193 A KR20000036193 A KR 20000036193A KR 20020001452 A KR20020001452 A KR 20020001452A
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South Korea
Prior art keywords
stainless steel
steel slab
cast
slab
water
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KR1020000036193A
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Korean (ko)
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김영조
심상대
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이구택
포항종합제철 주식회사
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Priority to KR1020000036193A priority Critical patent/KR20020001452A/en
Publication of KR20020001452A publication Critical patent/KR20020001452A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/023—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes by immersion in a bath
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed

Abstract

PURPOSE: To eliminate surface scale present in the middle part of a stainless steel slab while minimizing the temperature drop of the stainless steel slab, the cooling conditions of a continuous cast stainless steel slab is properly controlled just before it is charged in a heating furnace during the manufacture of a stainless steel slab using hot charge rolling(HRC). CONSTITUTION: The method for manufacturing stainless steel slab is characterized in that as conveying stainless steel slab at 20-30m/min on a convey table, cooling water is sprayed on upper side of the stainless steel slab at a pressure 6 to 7bar, being mixed with 15-25bar of air, and then it is dipped in a water basin for 10 to 30sec followed by charging in a heating furnace.

Description

표면 스케일이 저감되는 스테인레스 주편의 제조방법{A METHOD FOR MANUFACTURING STAINLESS STEEL SLABS REDUCING M TYPE SLIVER DEFECT}Manufacturing method of stainless steel slab with reduced surface scale {A METHOD FOR MANUFACTURING STAINLESS STEEL SLABS REDUCING M TYPE SLIVER DEFECT}

본 발명은 스테인레스강의 제조에 관한 것으로, 보다 상세하게는 M형 슬리버(sliver) 결함이 심한 스테인레스 주편의 제조시 냉각조건을 적절히 제어하므로써 표면 스케일이 저감되는 스테인레스 주편의 제조방법에 관한 것이다.The present invention relates to the production of stainless steel, and more particularly to a method for producing a stainless steel slab is reduced in surface scale by appropriately controlling the cooling conditions in the production of stainless steel slabs severe M-type sliver (sliver) defects.

스테인레스강은 Cr이 12%이상 함유되어 있어 Cr2O3의 부동태 피막을 형성하여 내식성이 뛰어난 강종이다. 반면, 스테인레스강은 제조공정에서 주편이 대기와 고온 분위기에서 표층이 산화되어 스케일이 코일에 이르기까지 그 코일 표면에 잔류되는 정도가 심하다. 즉, 일반 탄소강의 경우 스케일 제거시 약 3000㎛ 두께 정도로 표면 스케일이 벗겨진다면 400계열의 스테인레스강의 경우는 약 500㎛ 정도, 그리고 304 스테인레스강종의 경우는 약 250㎛ 정도로 스케일이 벗겨져 주편 표면에 스케일이 다량 잔류하는 아주 민감한 강종이다.Stainless steel contains more than 12% Cr and forms a passivation film of Cr 2 O 3 to be excellent in corrosion resistance. Stainless steel, on the other hand, has a high degree of remaining on the surface of the coil in the manufacturing process, in which the surface layer is oxidized in the atmosphere and high temperature atmosphere until the scale reaches the coil. In other words, if the surface scale is peeled off by about 3000㎛ thickness in case of general carbon steel, the scale is peeled off by about 500㎛ in case of 400 series stainless steel and about 250㎛ in case of 304 stainless steel. It is a very sensitive steel grade that remains large.

이러한 표면 스케일층은 주편이 가열로에 장입되면서 열충격에 의해 주편 표층 아래에서 균열을 야기하거나 주로 M형 슬리버 결함을 일으킨다. 스테인레스강의 제조시 발생되는 M형 슬리버 결함을 저감시키기 위해 현재 실조업에서는 주편을 가열로에 장입할 때 장입온도를 상향시키는 고온장입에 의한 열간압연(hot charge rolling; 이하, 단지 `HCR')을 주로 사용하고 있다.This surface scale layer causes cracking under the surface layer of the slab by thermal shock as the slab is charged into the furnace or mainly causes an M-type sliver defect. In order to reduce the M-type sliver defects generated in the production of stainless steel, in the present manufacturing industry, hot charge rolling (hereinafter referred to as 'HCR') due to the high temperature charging that raises the charging temperature when the cast steel is charged into the furnace. Mainly used.

상기 HCR은 탄소강의 제조시와는 달리 연속주조된 열간상태의 스테인레스 주편을 가열로에 장입하여 열간압연하는 방법으로 열충격에 의한 미세 균열이 발생하지 않아 M형 슬리버 결함 발생을 저감하는데 효과적이었다. 그러나, 상기 HCR에 의한 스테인레스강을 제조하는 경우 여전히 제거되는 표면 스케일의 양이 적어 압연후에도 열연코일에 스케일이 잔류하여 면거침 결함을 발생시키고 있는 실정이다. 이러한 면거침 결함은 주편의 중심부에 집중되고 있는데, 결국 HCR에 의해서도 스테인레스강의 면거침 결함 발생을 억제하는데는 여전히 미흡하다.Unlike the production of carbon steel, the HCR was effective in reducing the occurrence of M-type sliver defects by inserting stainless steel slabs in a continuous cast hot state into a heating furnace and hot rolling. However, in the case of manufacturing the stainless steel by the HCR, the amount of surface scale that is still removed is small, and the scale remains in the hot rolled coil even after rolling, causing surface roughness defects. These roughness defects are concentrated in the center of the cast steel, and thus, HCR is still insufficient to suppress the occurrence of roughness defects in stainless steel.

스테인레스강의 표면 스케일 제거를 위해 종래 여러 방법이 시도되어왔는데, 그 대표적인 방법으로서 대한민국 공개특허 제99-50929호에는 조압연 스탠드에서 스테인레스강 표면의 M형 결함을 방지할 수 있는 열간압연방법이 제시되어 있다. 상기 대한민국 공개특허 제99-50929호에 따른 열간압연방법은 스테인레스 주편의 양단으로부터 200mm 지점까지 수증기를 15~25Kgf/㎠의 압력으로 분사한 후 조압연하여 표면 M형 결함을 효과적으로 방지하여 표면품질을 개선하는 방법이다. 그러나, 상기 방법은 압연재 표면의 두꺼운 스케일을 충분히 제거할 수 있으나, 고압수 대신 수증기를 사용할 뿐만아니라 여전히 주편의 중심부에 표면 스케일이 잔존하는 문제가 있다.Various methods have been attempted to remove the surface scale of stainless steel, and as a representative method, Korean Patent Laid-Open Publication No. 99-50929 discloses a hot rolling method capable of preventing M-type defects on a stainless steel surface in a rough rolling stand. have. In the hot rolling method according to the Republic of Korea Patent Publication No. 99-50929, spraying water vapor at a pressure of 15 to 25 kgf / cm2 from both ends of the stainless steel slab at a pressure of 15 to 25 kgf / cm2 and roughly rolling to effectively prevent surface M-type defects to improve surface quality. How to improve. However, the method can sufficiently remove the thick scale on the surface of the rolled material, but there is a problem that the surface scale remains in the center of the cast steel as well as using steam instead of high pressure water.

본 발명은 이러한 종래의 문제를 해결하고자 제안된 것으로서, 그 목적은 HCR에 의한 스테인레스강의 제조시 연속주조된 스테인레스 주편을 가열로에 장입하기 직전 냉각조건을 적절히 제어하므로써, 주편의 온도 하락을 최소화하면서도 주편의 중심부에 존재하는 표면 스케일까지 제거할 수 있는 스테인레스 주편의 제조방법을 제공함에 있다.The present invention has been proposed to solve such a conventional problem, and an object thereof is to minimize the temperature drop of the cast by appropriately controlling the cooling conditions immediately before charging the continuously cast stainless cast steel into the heating furnace in the production of stainless steel by HCR. The present invention provides a method for producing a stainless steel slab that can remove the surface scale existing in the center of the cast steel.

도1은 본 발명의 냉각장치가 구비된 연속주조기의 개략 구성도1 is a schematic configuration diagram of a continuous casting machine equipped with a cooling device of the present invention

도2는 도1의 냉각장치의 상세 구성도Figure 2 is a detailed configuration diagram of the cooling device of Figure 1

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1 ..... 연속주조기 2 ..... 래들 3 ..... 턴디쉬1 ..... Continuous Casting Machine 2 ..... Ladle 3 ..... Tundish

4 ..... 몰드 10 .... 냉각장치 8 ..... 주편4 ..... Mold 10 .... Chiller 8 ..... Cast

상기 목적 달성을 위한 본 발명은 스테인레스강의 제조방법에 있어서,In the present invention for achieving the above object,

주조된 스테인레스 주편을 이송롤 테이블에서 20~30m/분의 속도로 이송하면서 6~7bar의 물과 15~25bar의 공기를 혼합하여 상기 주편 상부에 냉각수를 살수한 후, 10~30초간 수냉조에 침적한 다음 상기 주편을 가열로에 장입하는 표면 스케일이 저감되는 스테인레스 주편의 제조방법에 관한 것이다.After casting the cast stainless cast steel at a feed roll table at a speed of 20 to 30 m / min, 6 to 7 bar of water and 15 to 25 bar of air are mixed to sprinkle the cooling water on the top of the cast steel and then deposited in a water cooling tank for 10 to 30 seconds. Then, the present invention relates to a method for manufacturing a stainless steel slab, the surface scale of charging the cast steel into a heating furnace is reduced.

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

우선, 본 발명은 스테인레스강의 종류에 관계없이 적용 가능하나, 표면품질이 요구되는 304 스테인레스강의 제조에 더욱 적합하다.First, the present invention can be applied regardless of the type of stainless steel, but is more suitable for the production of 304 stainless steel surface quality is required.

본 발명은 연속주조된 스테인레스 주편을 먼저 냉각수로 살수하여 냉각한 후이어서 바로 수냉조에 침적하여 냉각함으로써 가열로에 장입되는 주편의 온도 하락을 최소화하는 동시에 주편의 표면 스케일을 최대한 제거함에 특징이 있다.The present invention is characterized in that the continuous casting of the stainless steel castings by cooling with water first, followed by cooling by directly immersing in a water cooling tank to minimize the temperature drop of the castings charged into the heating furnace and to remove the surface scale of the castings as much as possible.

본 발명에서는 연속주조된 스테인레스 주편의 온도 하락을 방지하기 위해서는 이송롤 테이블에서 20~30m/분의 속도로 이송하는 것이 적당하다.In the present invention, in order to prevent the temperature drop of the continuously cast stainless steel cast is suitable to feed at a speed of 20 ~ 30m / min in the feed roll table.

또한, 본 발명의 경우 냉각수를 공기와 더불어 살수하는데, 상기한 이송속도를 유지하는 설비의 경우 스테인레스 주편에 살수되는 냉각수는 6~7bar의 물과 15~25bar의 공기를 혼합하여 상기 주편 상부에 살수함이 바람직하다. 기본적으로 냉각수의 온도는 낮기 때문에 급랭 효과에 의한 스케일 제거 효과는 물론 고압 살수를 하므로써 기계적으로 스케일을 박리시키는 효과도 있다.In addition, in the case of the present invention, the cooling water is sprayed together with the air, in the case of the equipment to maintain the transfer speed, the cooling water sprayed on the stainless steel slab is mixed with water of 6 ~ 7bar and 15 ~ 25bar of water to spray the upper portion of the cast steel It is preferable to. Since the temperature of the cooling water is basically low, the scale removal effect due to the quenching effect, as well as the high-pressure water spraying, has the effect of mechanically peeling the scale.

바람직하게는 상기 주편의 중심부에 잔류하는 스케일을 보다 효과적으로 제거하기 위해서 주편의 양측에서 살수되는 냉각수는 냉각수의 노즐을 주편의 중심부 측으로 5~20°정도 기울어진 방향으로 설치하여 살수하는 것이다.Preferably, in order to more effectively remove the scale remaining in the center of the slab, the cooling water sprayed from both sides of the slab is sprayed by installing a nozzle of the cooling water in a direction inclined about 5 to 20 degrees toward the center of the slab.

그 다음, 고압으로 냉각수를 살수한 후에는 스테인레스 주편을 약 10~30초간 수냉조에 침적한 후 상기 주편을 가열로에 장입한다. 이러한 상태로 스테인레스 주편을 가열로에 장입하면 약 500℃ 이상으로 유지할 수 있어 M형 슬리버 결함 방지에 적합하다.Then, after the cooling water is sprayed at high pressure, the stainless steel slab is deposited in a water cooling tank for about 10 to 30 seconds, and then the cast steel is charged to a heating furnace. In this state, when the stainless steel slab is charged into the furnace, it can be maintained at about 500 ° C or higher, which is suitable for preventing M-type sliver defects.

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

[실시예]EXAMPLE

도1과 같은 연속주조기(1)에서 연속주조되는 304 스테인레스 주편(8)을 이송테이블(6) 상에서 냉각수를 살수하여 1차 냉각한 후, 냉각된 주편을 바로수냉조(7)에 침적하였다. 도1에서 미설명부호 "2"는 래들, "3"은 턴디쉬, "4"는 몰드, "5"는 절단기를 의미한다. 냉각수의 살수는 도2와 같이, 냉각수 라인(11)에 다수개의 노즐(12)이 일정한 간격을 두고 연결된 구조를 갖는 냉각장치(10)에 의해 실시하였다. 이때, 주조속도, 냉각조건 및 침적시간은 표1과 같이 행하였다.The 304 stainless cast 8 continuously cast in the continuous casting machine 1 as shown in FIG. 1 was first cooled by sprinkling the cooling water on the transfer table 6, and then the cooled cast was directly deposited in the water cooling tank 7. In FIG. 1, reference numeral 2 denotes a ladle, 3 denotes a tundish, 4 denotes a mold, and 5 denotes a cutter. As shown in FIG. 2, the cooling water was sprayed by a cooling device 10 having a structure in which a plurality of nozzles 12 were connected to the cooling water line 11 at regular intervals. At this time, casting speed, cooling conditions and deposition time were performed as shown in Table 1.

이와같이, 냉각조건을 변화시키면서 제조된 각각의 주편에 대하여 스케일 잔류 정도 및 면거침 발생율을 측정하고, 그 결과를 표1에 나타내었다.In this way, the scale residual degree and the surface roughness incidence of each of the prepared cast pieces while changing the cooling conditions, and the results are shown in Table 1.

구분division 주조속도(m/분)Casting speed (m / min) 냉각조건(bar)Cooling condition (bar) 침적시간(초)Deposition time (seconds) 주편온도(℃)Cast temperature (℃) 스케일 잔류량(%)Scale residual amount (%) 면거침 발생율(%)Cotton roughness occurrence rate (%) 물water 공기air 노즐각도(°)Nozzle Angle (°) 종래예Conventional example 2020 -- -- -- 6060 380380 28.028.0 2.02.0 비교예1Comparative Example 1 1010 33 1010 55 6060 400400 12.012.0 1.11.1 비교예2Comparative Example 2 1515 33 1010 55 3030 390390 10.510.5 0.90.9 발명예1Inventive Example 1 2020 66 2525 55 3030 580580 3.53.5 0.30.3 발명예2Inventive Example 2 3030 77 1515 2020 1010 590590 3.33.3 0.20.2 비교예3Comparative Example 3 4040 1010 3030 2525 1010 640640 15.015.0 1.41.4 비교예4Comparative Example 4 5050 1010 4040 3030 3030 590590 14.814.8 1.41.4

표1에 나타난 바와 같이, 본 발명에 따라 냉각된 주편의 경우 종래의 경우에 비하여 주편의 온도 하락 폭도 적으면서도 스케일 잔류량 및 면거침 정도가 극히 감소한 반면, 본 발명의 조건을 마족하지 않은 비교예(1-4)의 경우 여전히 스케일 잔류량과 면거침 발생 정도가 심하게 나타남을 알 수 있었다.As shown in Table 1, the cast slab cooled according to the present invention, while the temperature drop of the cast slab compared to the conventional case, while the scale residual amount and surface roughness was extremely reduced, while the comparative example did not meet the conditions of the present invention ( In the case of 1-4), scale residual amount and surface roughness were still severe.

상술한 바와 같이, 본 발명에 의하면, HCR에 의한 스테인레스강의 제조시 연속주조된 스테인레스 주편을 가열로에 장입하기 직전 냉각조건을 적절히 제어하므로써, 스테인레스 주편의 온도 하락을 최소화하면서도 주편의 중심부에 존재하는 표면 스케일까지 제거할 수 있는 커다란 효과가 있다.As described above, according to the present invention, by appropriately controlling the cooling conditions immediately before charging the continuously cast stainless steel slab in the heating furnace during the production of stainless steel by HCR, it is possible to minimize the temperature drop of the stainless steel slab, There is a huge effect that can be removed to the surface scale.

Claims (2)

스테인레스강의 제조방법에 있어서,In the manufacturing method of stainless steel, 주조된 스테인레스 주편을 이송롤 테이블에서 20~30m/분의 속도로 이송하면서 6~7bar의 물과 15~25bar의 공기를 혼합하여 상기 주편 상부에 냉각수를 살수한 후, 10~30초간 수냉조에 침적한 다음 상기 주편을 가열로에 장입함을 특징으로 하는 표면 스케일이 저감되는 스테인레스 주편의 제조방법After casting the cast stainless cast steel at a feed roll table at a speed of 20 to 30 m / min, 6 to 7 bar of water and 15 to 25 bar of air are mixed to sprinkle the cooling water on the top of the cast steel and then deposited in a water cooling tank for 10 to 30 seconds. And then a method for producing a stainless steel slab, the surface scale of which is characterized in that the slab is charged to a heating furnace. 제1항에 있어서, 상기 주편의 양측에서 살수되는 냉각수는 주편의 중심부 측으로 5~20° 기울어진 방향으로 살수함을 특징으로 하는 표면 스케일이 저감되는 스테인레스 주편의 제조방법The method of claim 1, wherein the cooling water sprayed from both sides of the cast steel is sprayed in a direction inclined 5 to 20 ° toward the center of the cast steel.
KR1020000036193A 2000-06-28 2000-06-28 A method for manufacturing stainless steel slabs reducing m type sliver defect KR20020001452A (en)

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KR100812065B1 (en) * 2006-11-23 2008-03-07 주식회사 포스코 Improvement method of surface roughness of hot rolled stainless steel coils
CN102847731A (en) * 2011-06-29 2013-01-02 宝山钢铁股份有限公司 Control method for surface roughness of finished cold metal strips
KR101242822B1 (en) * 2009-10-30 2013-03-12 주식회사 포스코 Method for scale reduction of rolling material

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JPH08176865A (en) * 1994-12-27 1996-07-09 Kawasaki Steel Corp Production of stainless steel strip and continuous annealing equipment of cold rolled stainless steel strip
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JPS60128214A (en) * 1983-12-15 1985-07-09 Kawasaki Steel Corp Preventive method for formation of speck pattern on stainless steel strip
JPH08176865A (en) * 1994-12-27 1996-07-09 Kawasaki Steel Corp Production of stainless steel strip and continuous annealing equipment of cold rolled stainless steel strip
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100812065B1 (en) * 2006-11-23 2008-03-07 주식회사 포스코 Improvement method of surface roughness of hot rolled stainless steel coils
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KR101242822B1 (en) * 2009-10-30 2013-03-12 주식회사 포스코 Method for scale reduction of rolling material
CN102847731A (en) * 2011-06-29 2013-01-02 宝山钢铁股份有限公司 Control method for surface roughness of finished cold metal strips

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