KR101230126B1 - Manufacturing method of hot-rolled ferritic stainless steel sheet without edge crack - Google Patents
Manufacturing method of hot-rolled ferritic stainless steel sheet without edge crack Download PDFInfo
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- KR101230126B1 KR101230126B1 KR1020090132512A KR20090132512A KR101230126B1 KR 101230126 B1 KR101230126 B1 KR 101230126B1 KR 1020090132512 A KR1020090132512 A KR 1020090132512A KR 20090132512 A KR20090132512 A KR 20090132512A KR 101230126 B1 KR101230126 B1 KR 101230126B1
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 7
- 230000007423 decrease Effects 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 abstract description 8
- 238000005336 cracking Methods 0.000 abstract description 4
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/14—Reduction rate
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Abstract
본 발명은 페라이트계 스테인리스강의 R1~R4단계로 이루어진 열간 조압연 공정에서, 상기 R2의 조압연 전단부 압하율에 대한 R3 및 R4의 조압연 후단부 압하율 비를 0.13 내지 0.15로 조절하여 에지크랙을 저감하기 위한 것으로, 특히 또한 조압연의 R1, R2-1, R2-2의 초기 3패스는 각 패스별 압하율을 점차적으로 증가시키고, R2-2, R3, R4의 후기 3패스는 각 패스별 압하율을 점차적으로 감소시켜 에지크랙을 저감하기 위한 페라이트계 스테인리스강의 열간압연재 제조방법을 제공한다. 본 발명에 의하면, 열간압연 공정중의 조압연 온도가 저하되는 후단부위의 압하량을 줄여서 에지크랙이 없는 품질이 양호한 페라이트계 스테인리스강을 제조할 수 있다.According to the present invention, in the hot rough rolling process consisting of R1 to R4 of ferritic stainless steel, the edge crack ratio of R3 and R4 to the rough rolling front end rolling reduction ratio of R2 and R4 is adjusted to 0.13 to 0.15. In particular, the initial three passes of R1, R2-1, and R2-2 of rough rolling gradually increase the rolling reduction rate for each pass, and the later three passes of R2-2, R3, and R4 each pass. The present invention provides a method for manufacturing hot rolled material of ferritic stainless steel to reduce edge cracking gradually to reduce edge cracking. According to the present invention, it is possible to manufacture a ferritic stainless steel having good quality without edge cracks by reducing the amount of reduction in the rear end portion at which the rough rolling temperature during the hot rolling process decreases.
페라이트계, 스테인레스강, 에지크랙, 조압연, 열연 Ferritic, Stainless Steel, Edge Crack, Rough Rolled, Hot Rolled
Description
본 발명은 페라이트계 스테인레스강의 에지부(edge) 품질을 향상시키기 위한 제조방법에 관한 것으로서, 구체적으로는 페라이트계 스테인레스강의 열연 압연 공정 중 조압연 패스 스케쥴간 압하율 부하 배분을 재조정해 온도가 떨어지는 조압연 후단부의 압하율을 감소 시켜 에지부 품질을 향상시키기 위한 페라이트계 스테인리스강의 열간압연재 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method for improving the edge quality of ferritic stainless steels. The present invention relates to a method for manufacturing a hot rolled material of ferritic stainless steel for improving the edge quality by reducing the reduction ratio of the rolling end portion.
일반적으로 표면 광택이 요구되는 페라이트계 스테인레스강은 제강, 열간압연, 냉간압연, 광휘소둔 및 스킨패스(skin pass)의 공정을 통해 제조되며, 열간압연 상 표면 품질확보가 최종 제품의 표면 광택 및 실수율에 큰 영향을 주게 된다. In general, ferritic stainless steel, which requires surface gloss, is manufactured through the process of steelmaking, hot rolling, cold rolling, bright annealing, and skin pass. It will have a big impact on this.
하지만 200~220mm의 슬라브를 최종압연두께 3.0~5.0mm 두께로 압연을 하게 되면 일부 구간에서 에지부 균열이 발생하기 때문에 후 공정에서 이 부분을 제거하기위한 트리밍(Trimming) 작업으로 제품 실수율 및 표면 품질에 문제를 주는 경우 가 있다. However, when the slab of 200 ~ 220mm is rolled to the final rolling thickness of 3.0 ~ 5.0mm thickness, edge crack occurs in some section, so the product error rate and surface quality by trimming to remove this part in the post process There is a case to give a problem.
기존의 기술의 경우 제강에서 주조된 슬라브를 1250℃ 이상의 고온 가열로에서 가열한 뒤 조압연 공정에서의 압하율을 87~88%로 적용하여 27mm 정도 두께의 Bar 상태로 압연을 하고 그 후 사상압연에서 원하는 제품 두께 (3~5mm)까지 압연을 하고 있다.In case of the existing technology, the slab cast in steelmaking is heated in a high-temperature furnace of 1250 ℃ or higher, and then rolled in a bar state of 27mm thickness by applying a reduction ratio of 87-88% in the rough rolling process, and then finishing rolling Are rolling to the desired product thickness (3 to 5 mm).
이 경우 압연 작업성의 경우는 양호하지만 [도 2]에 나타난 바와 같이 에지부에 균열이 빈번하게 발생하고 이렇게 발생한 균열은 최종 제품의 표면 광택 및 실수율에 악영향을 미치게 된다.In this case, the rolling workability is good, but as shown in FIG. 2, cracks frequently occur at the edges, and thus the cracks adversely affect the surface gloss and the error rate of the final product.
상기와 같은 문제점을 해결하기 위한 것으로서,As to solve the above problems,
중량%로, C:0.080%이하, N:0.08%이하, C+N:0.10%이하, Si: 0.7% 이하, S:0.010%이하, Cr:16.0~17.0%, Ni:1.0%이하, Mo:0.5%이하, Cu:0.5%이하, Nb 0.5이하 조성범위를 가지고 있으며, 기타 불가피한 불순물로 이루어진 강종을 열간압연시 조압연 구간에서 압하량을 적절히 조절하여 에지크랙 발생이 없는 페라이트계 스테인레스강판을 제조하는 방법을 제공하는데 있다.By weight%, C: 0.080% or less, N: 0.08% or less, C + N: 0.10% or less, Si: 0.7% or less, S: 0.010% or less, Cr: 16.0-17.0%, Ni: 1.0% or less, Mo : 0.5% or less, Cu: 0.5% or less, Nb 0.5 or less, and ferrite-based stainless steel plate without edge cracks by appropriately adjusting the rolling reduction in the rough rolling section during hot rolling of other inevitable impurities It is to provide a method of manufacturing.
본 발명은 상술한 기술적 과제를 달성하기 위하여, 페라이트계 스테인리스강의 R1~R4단계로 이루어진 열간 조압연 공정에서, 상기 R2의 조압연 전단부 압하율에 대한 R3 및 R4의 조압연 후단부 압하율 비를 0.13 내지 0.15로 조절한다.The present invention, in order to achieve the above technical problem, in the hot rough rolling process consisting of R1 ~ R4 step of the ferritic stainless steel, the ratio of the rough rolling rear end reduction ratio of R3 and R4 to the rough rolling front end rolling ratio of R2 Is adjusted to 0.13 to 0.15.
또한 조압연의 R1, R2-1, R2-2의 초기 3패스는 각 패스별 압하율을 점차적으로 증가시키고, R2-2, R3, R4의 후기 3패스는 각 패스별 압하율을 점차적으로 감소시킬 수 있다.In addition, the initial three passes of R1, R2-1, and R2-2 of crude rolling gradually increase the reduction rate for each pass, and the later three passes of R2-2, R3, R4 gradually decrease the reduction rate of each pass. You can.
나아가 상기 조압연 전단부인 R2의 압하율을 전체 압하율 대비 23% 내지 29%에서 결정하고, 상기 조압연 후단부인 R3 및 R4의 압하율을 전체 압하율 대비 4 내지 7.5%에서 결정할 수 있다.Further, the reduction ratio of the rough rolling front end portion R2 may be determined at 23% to 29% of the total rolling reduction rate, and the reduction ratio of the rough rolling rear ends R3 and R4 may be determined at 4 to 7.5% of the total rolling reduction ratio.
또한, 본 발명에서 상기 페라이트계 스테인리스강은 중량%로, C:0.080%이하, N:0.08%이하, C+N:0.10%이하, Si: 0.7% 이하, S:0.010%이하, Cr:16.0~17.0%, Ni:1.0%이하, Mo:0.5%이하, Cu:0.5%이하, Nb 0.5이하 조성범위를 가지고 있으며, 기타 불가피한 불순물로 이루어진 430M강종을 대상으로 한다. In addition, the ferritic stainless steel in the present invention by weight%, C: 0.080% or less, N: 0.08% or less, C + N: 0.10% or less, Si: 0.7% or less, S: 0.010% or less, Cr: 16.0 ~ 17.0%, Ni: 1.0% or less, Mo: 0.5% or less, Cu: 0.5% or less, Nb 0.5 or less, and the composition ranges from 430M steel grade consisting of other unavoidable impurities.
본 발명에 의하면 열간압연 공정 중 조압연 온도가 떨어지는 후단부위의 압하량을 줄이고 바 두께를 하향함으로 에지크랙이 없는 양호한 품질의 페라이트계 스테인리스강을 생산할 수 있다. According to the present invention, it is possible to produce a good quality ferritic stainless steel without edge cracking by reducing the amount of reduction in the rear end portion where the rough rolling temperature falls during the hot rolling process and decreasing the thickness of the bar.
이하 첨부된 도면을 참조하여 본 발명의 실시예를 설명한다.BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
본 실시예의 대상이 되는 강종은 중량%로, C:0.080%이하, N:0.08%이하, C+N:0.10%이하, Si: 0.7% 이하, S:0.010%이하, Cr:16.0~17.0%, Ni:1.0%이하, Mo:0.5%이하, Cu:0.5%이하, Nb 0.5이하, 즉 통상의 페라이트 계열 430M 강종의 조성범위를 가지고 있다.Steel grades to be subjected to the present examples are% by weight, C: 0.080% or less, N: 0.08% or less, C + N: 0.10% or less, Si: 0.7% or less, S: 0.010% or less, Cr: 16.0 to 17.0% , Ni: 1.0% or less, Mo: 0.5% or less, Cu: 0.5% or less, Nb 0.5 or less, that is, the composition range of ordinary ferritic 430M steel grades.
본 실시예는 상술한 강종의 열연압연 공정 중 조압연 구간에서의 패스별 압하율 배분과 바 두께 변경을 통해서 에지부 품질을 향상시키는 방안이다. 이하 구체적으로 설명한다.The present embodiment is a method for improving the edge quality through the distribution of the reduction ratio and bar thickness for each pass in the rough rolling section of the above-described hot rolling process of the steel grade. This will be described in detail below.
일반적으로 열간압연공정은 [도 1]에 도시된 바와 같이 크게 5단계로 구분된다. 즉, 슬라브를 가열하는 가열단계, 가열된 슬라브의 두께와 폭을 제어하는 조압연단계, 조압연 후 목표로 하는 제품의 치수로 최종적으로 제어하는 다듬질압연단계, 다듬질압연후 스트립의 재질을 맞추기 위한 수냉단계 및 압연된 스트립을 열연코일로 감기위한 권취단계로 나누어진다.In general, the hot rolling process is largely divided into five stages as shown in FIG. That is, the heating step of heating the slab, the rough rolling step of controlling the thickness and width of the heated slab, the finishing rolling step of finally controlling the dimensions of the target product after the rough rolling, and the material of the strip after finishing rolling It is divided into a water cooling step and a winding step for winding the rolled strip with a hot rolled coil.
이 때 430M강종의 조압연 패스 스케쥴은 R1, R2-1, R2-2, R2-3, R3 및 R4 총 6번의 압연공정을 거치도록 되어 있다. 그런데 조압연 후단으로 가면서 가열로 추출이후 시간이 지나면서 온도가 떨어지고 여기에 롤냉각수의 효과가 더해져서 온도 하락이 심해진다. 이때 발열 면적율이 높은 에지부의 온도 하락이 특히 더 심하게 된다.At this time, the rough rolling pass schedule of the 430M steel grade is to go through a total of six rolling processes R1, R2-1, R2-2, R2-3, R3 and R4. By the way, after going to the end of the rough rolling, the temperature drops over time after the extraction of the furnace, and the drop of the temperature increases due to the effect of the roll cooling water. At this time, the temperature drop of the edge portion having a high heat generating area ratio is particularly severe.
페라이트 계열 스테인리스강의 압연 시 발생하는 균열은 조압연 작업 시 온도가 떨어지는 후단부분 R3, R4의 압하율이 상대적으로 높은 것에 비하여 에지부는 온도 하락에 따라 재결정 온도에 근접함으로써 가공경화에 따른 균열이 발생하는 것으로 판단된다.The cracks generated during rolling of ferritic stainless steels are relatively high in the rolling ratio of the rear end parts R3 and R4 where the temperature drops during rough rolling, whereas the edge part approaches the recrystallization temperature as the temperature decreases. It seems to be.
이를 확인하기 위하여 조압연의 6단계 압연공정의 압하량을 기존과 다르게 변경하여 실험을 진행하였다.In order to confirm this, the experiment was carried out by changing the reduction of the rolling step in the six-step rolling process of the rough rolling.
표 1은 조압연 패스별 기존의 압하량과 변경 적용한 압하량을 나타낸 표이다. 기존 R1, R2-1 압하율은 큰 변화 없이 종래 기술과 동일하게 하고 R2-2부터 R2-3의 압하량을 4mm씩 증가 시키고 반면에 조압연 후단인 R3 압하량을 기존 17mm 에서 14mm로 줄이고 R4 압하량을 15mm에서 8mm로 줄이면서 온도하락 구간에서의 압하량을 줄였다.Table 1 is a table showing the existing reduction amount and the applied reduction amount for each rough rolling pass. Existing R1 and R2-1 reduction ratios are the same as in the prior art without significant change, and the reduction ratio of R2-2 to R2-3 is increased by 4mm, while the reduction ratio of R3, which is after rough rolling, is reduced from 17mm to 14mm and R4. The amount of reduction in the temperature drop section was reduced while reducing the amount of reduction from 15mm to 8mm.
또한 바(Bar) 두께를 기존대비 1mm 상향하면서 조압연 총 압하량을 기존대비 1mm 즉 총 두께 대비 0.523%를 줄였다.In addition, the bar thickness was increased by 1mm compared to the previous one, and the total rolling reduction was reduced by 1mm, which is 0.523% of the total thickness.
[표 1][Table 1]
위와 같은 변경 조건으로 조압연을 실시한 후 에지크랙의 발생여부를 조사하였다. 기존 조압연 조건으로 인해 10%대로 발생한 430M강의 에지크랙은 신규 조압연 패스별 압하율을 적용한 뒤로는 현재까지 에지크랙 발생율이 0%로 개선되었다.After rough rolling under the conditions described above, the occurrence of edge cracks was examined. Edge cracks of 430M steel, which occurred at 10% due to the existing rough rolling conditions, have improved edge cracking rate to 0% until now.
상술한 변경 조건을 패스별로 전체 압하량에 대한 압하율로 변환하여 아래 [표 2]에 도시하였다.The above-described change condition is converted into a reduction ratio for the total reduction amount for each pass and is shown in Table 2 below.
[표 2][Table 2]
본 실시예에 있어서 변경된 압하율을 위 표 2와 같이 전체 압하량에 대한 각 패스별 % 압하율로 나타내어 보면 1 내지 3패스까지 점차적으로 증가하다가 4 내지 6패스의 경우에는 점차 감소하도록 제어하였다. 또한 이를 기존 압하비율과 비교하여 보면 조압연 전단부인 R2의 경우 기존에 비하여 압하율을 증가시켰으며 조압연 후단부인 R3 및 R4의 경우에는 기존에 비하여 압하율을 감소시켰다.In the present embodiment, when the changed reduction ratio is expressed as% reduction ratio for each pass of the total reduction amount as shown in Table 2, the control was gradually increased to 1 to 3 passes, and then gradually decreased in the case of 4 to 6 passes. In addition, compared with the conventional reduction ratio, the reduction ratio was increased compared to the conventional R2, the rough rolling front end, and the reduction ratio is reduced compared to the conventional R3 and R4 after the rough rolling.
결국, 본 발명은 조압연 전단부인 R2에 대한 후단부인 R3 및 R4의 압하량비가 0.13 내지 0.15의 범위에서 결정되도록 후단부의 압하량을 기존에 비하여 감소시키는 것이 바람직하다. 이 때 압하량 비가 0.13 이하인 경우에는 전단부에 압하량이 집중되므로 패스별 조압연 공정의 의미가 퇴색되어 슬라브의 품질에 악영향을 미치게 되며, 0.15 이상인 경우에는 앞서 설명한 바와 같이 에지크랙이 발생하는 문제가 나타난다.As a result, in the present invention, it is preferable to reduce the reduction amount of the rear end portion as compared with the conventional one so that the reduction ratio of the rear end portions R3 and R4 to the rough rolling front end portion R2 is determined in the range of 0.13 to 0.15. In this case, if the rolling reduction ratio is 0.13 or less, the rolling reduction is concentrated at the front end, so the meaning of the rough rolling process for each pass fades, which adversely affects the quality of the slab. appear.
또한 R2의 조압연 전단부 압하율을 각각 23% 내지 29%내에서 결정하고, 조압연 후단부 압하율을 각각 4% 내지 7.5%내에서 결정하되, 3패스까지는 점차적으로 증가하도록 결정하고, 4패스부터 6패스까지는 점차 감소하도록 압하율을 결정하는 것이 바람직하다.In addition, the rough rolling front end reduction rate of R2 is determined within 23% to 29%, respectively, and the rough rolling rear end reduction rate is determined within 4% to 7.5%, respectively, but is determined to gradually increase up to 3 passes. It is desirable to determine the reduction ratio from the pass to the 6 pass to decrease gradually.
한편, 총 압하율을 0.5% 정도 감소시켜 두께가 증가된 바(bar)의 경우 사상압연 전단의 Bar Heater와 Edge Heater로 인해 최대 40℃ 정도의 온도 보상을 받은 뒤 사상압연을 함으로써 에지(Edge)부의 품질을 개선할 수 있었다.On the other hand, in the case of the increased thickness by reducing the total reduction rate by 0.5%, the edge is obtained by finishing the rolling after receiving the temperature compensation up to about 40 ° C by the bar heater and the edge heater of the finishing rolling shear. We could improve the quality of wealth.
이상 본 발명의 바람직한 실시예에 대하여 설명하였으나, 본 발명의 기술적 사상이 상술한 바람직한 실시예에 한정되는 것은 아니며, 특허청구범위에 구체화된 본 발명의 기술적 사상을 벗어나지 않는 범주에서 다양한 페라이트계 스테인리스강의 에지크랙을 저감하기 위한 열간압연 방법으로 구현될 수 있다.Although the preferred embodiments of the present invention have been described above, the technical spirit of the present invention is not limited to the above-described preferred embodiments, and various ferritic stainless steels are not limited to the technical spirit of the present invention specified in the claims. It may be implemented by a hot rolling method for reducing edge cracks.
도 1은 페라이트계 스테인리스강의 열간 압연 공정도이다. 1 is a hot rolling process diagram of a ferritic stainless steel.
도 2는 430M강에 에지크랙이 발생한 경우를 나타내는 사진이다.2 is a photograph showing a case where an edge crack occurs in 430M steel.
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| KR20010028039A (en) * | 1999-09-17 | 2001-04-06 | 이구택 | Method for Preventing Surface Cracks of Ferritic Stainless Steel During Hot Rolling Process |
| JP2004283909A (en) * | 2003-01-27 | 2004-10-14 | Jfe Steel Kk | Flying thickness changing method in continuous hot rolling and method for manufacturing hot-rolled steel sheet |
| JP2005200712A (en) * | 2004-01-16 | 2005-07-28 | Nisshin Steel Co Ltd | Cold-rolled steel sheet for at plate with reduced residual stress |
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| KR20010028039A (en) * | 1999-09-17 | 2001-04-06 | 이구택 | Method for Preventing Surface Cracks of Ferritic Stainless Steel During Hot Rolling Process |
| JP2004283909A (en) * | 2003-01-27 | 2004-10-14 | Jfe Steel Kk | Flying thickness changing method in continuous hot rolling and method for manufacturing hot-rolled steel sheet |
| JP2005200712A (en) * | 2004-01-16 | 2005-07-28 | Nisshin Steel Co Ltd | Cold-rolled steel sheet for at plate with reduced residual stress |
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