KR20180109865A - Nb-containing ferritic stainless steel hot-rolled steel sheet and manufacturing method thereof, Nb-containing ferritic stainless steel cold-rolled steel sheet and manufacturing method thereof - Google Patents

Nb-containing ferritic stainless steel hot-rolled steel sheet and manufacturing method thereof, Nb-containing ferritic stainless steel cold-rolled steel sheet and manufacturing method thereof Download PDF

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KR20180109865A
KR20180109865A KR1020187018664A KR20187018664A KR20180109865A KR 20180109865 A KR20180109865 A KR 20180109865A KR 1020187018664 A KR1020187018664 A KR 1020187018664A KR 20187018664 A KR20187018664 A KR 20187018664A KR 20180109865 A KR20180109865 A KR 20180109865A
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steel sheet
rolled steel
stainless steel
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KR102267129B1 (en
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유타카 야쿠시진
아키라 히로나카
가즈나리 이마카와
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닛신 세이코 가부시키가이샤
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Abstract

본 발명의 Nb함유 페라이트계 스테인리스 열연 강판은 C:0.030질량%이하, Si:2.00질량%이하, Mn:2.00질량%이하, P:0.050질량%이하, S:0.040질량%이하, Cr:10.00질량%∼25.00질량%, N:0.030질량%이하, Nb:0.01질량%∼0.80질량%를 함유하고, 잔부가 Fe 및 불가피한 불순물로 이루어지는 조성을 갖는다. 이 Nb함유 페라이트계 스테인리스 열연 강판에 있어서, Nb 탄질화물의 석출량은 0.2질량%이상이고, 또한 입경 0.1㎛이하의 라베스상이 면적 10㎛2당 10개 이하이다.The Nb-containing ferritic stainless steel hot-rolled steel sheet according to the present invention contains 0.030 mass% or less of C, 2.00 mass% or less of Si, 2.00 mass% or less of Mn, 0.050 mass% or less of P, 0.040 mass% or less of S, % To 25.00 mass%, N: 0.030 mass% or less, Nb: 0.01 mass% to 0.80 mass%, and the balance of Fe and unavoidable impurities. In the Nb-containing ferritic stainless hot-rolled steel sheet, Nb and the precipitation amount of carbonitride is more than 0.2 mass%, a Laves phase having a grain size also 0.1㎛ 10㎛ area below 10 or less per second.

Description

Nb함유 페라이트계 스테인리스 열연 강판 및 그 제조 방법과, Nb함유 페라이트계 스테인리스 냉연 강판 및 그 제조 방법Nb-containing ferritic stainless steel hot-rolled steel sheet and manufacturing method thereof, Nb-containing ferritic stainless steel cold-rolled steel sheet and manufacturing method thereof

본 발명은 Nb함유 페라이트계 스테인리스 열연 강판 및 그 제조 방법과, Nb함유 페라이트계 스테인리스 냉연 강판 및 그 제조 방법에 관한 것이다. 특히, 본 발명은 배기관 플랜지 부품 및 배기관 부품을 제조하기 위해 이용되는 Nb함유 페라이트계 스테인리스 열연 강판 및 그 제조 방법과, Nb함유 페라이트계 스테인리스 냉연 강판 및 그 제조 방법에 관한 것이다.The present invention relates to a Nb-containing ferritic stainless steel hot-rolled steel sheet, a method for producing the same, and a Nb-containing ferritic stainless steel cold-rolled steel sheet and a manufacturing method thereof. In particular, the present invention relates to a Nb-containing ferritic stainless steel hot-rolled steel sheet used for manufacturing an exhaust pipe flange part and an exhaust pipe part, a method of manufacturing the same, and a Nb-containing ferritic stainless steel cold-rolled steel sheet and a manufacturing method thereof.

배기관 플랜지 부품 및 배기관 부품에는 내식성, 내열성 및 강도 등의 특성이 요구되기 때문에, 이러한 특성이 우수한 스테인리스 강판이 소재로서 이용되고 있다. 여기서, 배기관 부품은 내부를 배기가스가 유통 가능한 부품을 의미하며, 특히, 자동차에 있어서의 배기 매니폴드, 프런트 파이프, 센터 파이프, 촉매 컨버터 외부통 등의 부품을 의미한다. 또, 배기관 플랜지 부품은 배기관 부품의 단부에 용접 접합되고, 해당 배기관 부품과 다른 부품의 체결 기능을 담당하는 플랜지부를 구성하는 부품을 의미한다.Since exhaust pipe flange parts and exhaust pipe parts are required to have characteristics such as corrosion resistance, heat resistance, and strength, stainless steel sheets having excellent properties are used as materials. Here, the exhaust pipe component means a part through which the exhaust gas can flow, and particularly means an exhaust manifold in a vehicle, a front pipe, a center pipe, and an outer cylinder of a catalytic converter. The exhaust pipe flange part means a part constituting a flange part which is welded to the end part of the exhaust pipe part and performs a function of engaging the exhaust pipe part with other parts.

종래, 스테인리스 강판으로서는 제조성이 양호한 오스테나이트계 스테인리스 강판이 일반적으로 이용되어 왔지만, 열팽창 계수 및 코스트의 면에서 유리한 페라이트계 스테인리스 강판으로의 치환이 진행되고 있다. 이러한 페라이트계 스테인리스 강판으로서는 Nb함유 페라이트계 스테인리스 강판을 들 수 있다.Conventionally, austenitic stainless steel sheet having good manufacturability has been generally used as a stainless steel sheet, but substitution with a ferritic stainless steel sheet favoring a thermal expansion coefficient and a cost has been progressing. Examples of such a ferritic stainless steel sheet include Nb-containing ferritic stainless steel sheets.

배기관 플랜지 부품은 열연 강판을 냉간 단조하는 것에 의해서 제조된다. 또, 배기관 플랜지 부품은 배기관 부품의 단부에 대응하는 구멍, 보틀 체결용의 구멍을 가지며, 절삭 가공도 실시되어 있는 것이 일반적이다. 그 때문에, 배기관 플랜지 부품의 제조에 이용되는 열연 강판에는 가공성이 요구된다.Exhaust pipe flange parts are manufactured by cold forging a hot-rolled steel sheet. Further, the exhaust pipe flange part has a hole corresponding to the end of the exhaust pipe part, a hole for fastening the bottle, and is also subjected to a cutting process. Therefore, the hot-rolled steel sheet used for manufacturing the exhaust pipe flange part is required to have workability.

또, 배기관 부품은 일반적으로, 냉연 강판을 프레스 가공하거나, 냉연 강판을 파이프 가공한 후에 각종 가공을 실행하는 것에 의해서 제조된다. 그 때문에, 배기관 부품의 제조에 이용되는 냉연 강판에도 가공성이 요구된다. 특히, 근래의 배기관 부품(특히, 배기 매니폴드)의 소형화에 수반하여, 냉연 강판의 가공성의 가일층의 향상이 요망되고 있다. 냉연 강판의 가공성은 랭크포드값(이하, 「r값」이라 함)을 지표로서 나타낼 수 있으며, r값을 향상시키기 위해서는 냉연 압하율을 크게 하는 것이 유효하다.Further, the exhaust pipe component is generally manufactured by press-working the cold-rolled steel sheet, or by performing various processing after the cold-rolled steel sheet is subjected to the pipe processing. Therefore, the cold-rolled steel sheet used for manufacturing the exhaust pipe part is also required to have processability. Particularly, along with the recent miniaturization of the exhaust pipe component (particularly, the exhaust manifold), it is desired to further improve the workability of the cold-rolled steel sheet. The workability of the cold-rolled steel sheet can be represented by a rank pod value (hereinafter referred to as " r value ") as an index, and it is effective to increase the cold rolling reduction ratio to improve the r value.

그러나, Nb함유 페라이트계 스테인리스 강판은 열연시에 라베스상(Fe2Nb를 주체로 하는 금속간 화합물)이 생성되어 인성 저하를 일으키기 쉽다. 또, 본래 페라이트계 스테인리스 강판은 475℃ 취화가 일어나기 쉽다. 그 때문에, 두꺼운 게이지(5㎜∼10㎜)의 Nb함유 페라이트계 스테인리스 열연 강판을 제조하고, 이것을 냉연하면, 깨짐이 발생하기 쉽고, 냉연 압하율을 크게 하는 것이 어렵다.However, in the Nb-containing ferritic stainless steel sheet, a Lavess phase (an intermetallic compound mainly composed of Fe 2 Nb) is generated during hot rolling, and toughness is liable to be lowered. In addition, the ferritic stainless steel sheet is prone to embrittlement at 475 deg. Therefore, if Nb-containing ferritic stainless steel hot-rolled steel sheets of a thick gauge (5 mm to 10 mm) are produced and cold rolled, it is easy to cause cracking, and it is difficult to increase the cold rolling reduction rate.

Nb함유 페라이트계 스테인리스 열연 강판의 인성을 향상시키는 방법으로서는 예를 들면, C 및 N의 합계량을 특정의 범위로 제어하는 것에 의해, 라베스상의 생성을 억제하는 방법이 특허문헌 1에 제안되어 있다.As a method for improving the toughness of the Nb-containing ferritic stainless steel hot-rolled steel sheet, for example, a method for suppressing the formation of the Laves phase by controlling the total amount of C and N to a specific range has been proposed in Patent Document 1.

또, Nb함유 페라이트계 스테인리스 냉연 강판의 가공성을 향상시키는 방법으로서는 예를 들면, 열연 마무리 개시 온도, 종료 온도 및 열연판 소둔 온도 등을 제어하는 방법이 특허문헌 2에 제안되어 있다.As a method for improving the workability of the Nb-containing ferritic stainless steel cold-rolled steel sheet, for example, a method for controlling the hot-rolling finishing start temperature, the finishing temperature and the hot-rolled sheet annealing temperature has been proposed in Patent Document 2.

특허문헌 1: 일본국 특허공개공보 평성10-237602호Patent Document 1: JP-A-10-237602 특허문헌 2: 일본국 특허공개공보 제2002-30346호Patent Document 2: Japanese Patent Application Laid-Open No. 2002-30346

그러나, 특허문헌 1의 방법은 판 두께가 4.5㎜ 정도의 Nb함유 페라이트계 스테인리스 열연 강판을 대상으로 하고 있으며, 두꺼운 게이지의 Nb함유 페라이트계 스테인리스 열연 강판에 대해서는 라베스상의 생성을 충분히 억제할 수 없다.However, the method of Patent Document 1 targets a Nb-containing ferritic stainless steel hot-rolled steel sheet having a sheet thickness of about 4.5 mm, and the production of the Lavess phase can not be sufficiently suppressed for the Nb-containing ferritic stainless steel hot- .

또, 특허문헌 2의 방법을 이용했다고 해도, Nb함유 페라이트계 스테인리스 냉연 강판의 가공성이 충분히 확보되지 않는다는 문제가 있다.Further, there is a problem in that the processability of the Nb-containing ferritic stainless steel cold rolled steel sheet can not be sufficiently secured even if the method of Patent Document 2 is used.

본 발명은 상기와 같은 문제를 해결하기 위해 이루어진 것이며, 인성 및 가공성이 우수한 Nb함유 페라이트계 스테인리스 열연 강판 및 그 제조 방법을 제공하는 것을 목적으로 한다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a Nb-containing ferritic stainless steel hot-rolled steel sheet excellent in toughness and workability and a method of manufacturing the same.

또, 본 발명은 가공성이 우수한 Nb함유 페라이트계 스테인리스 냉연 강판 및 그 제조 방법을 제공하는 것을 목적으로 한다.It is another object of the present invention to provide a Nb-containing ferritic stainless steel cold-rolled steel sheet excellent in workability and a manufacturing method thereof.

본 발명자는 상기의 문제를 해결하기 위해 예의 연구를 계속한 결과, 특정의 조성을 갖는 스테인리스강 슬래브를 열연할 때에, 1100℃∼1000℃의 온도에서 60초 이상 유지하는 동시에 마무리 열연 온도를 850℃이상으로 하고, 열연 후에 550℃이하의 권취 온도에서 권취하는 것에 의해서 Nb 탄질화물 및 라베스상의 양을 적정 범위로 제어할 수 있고, 그 결과로서 Nb함유 페라이트계 스테인리스 열연 강판의 인성이 향상하는 것을 발견하고, 본 발명을 완성하기에 이르렀다.As a result of intensive studies to solve the above problems, the present inventors have found that when a stainless steel slab having a specific composition is hot rolled, the slab is maintained at a temperature of 1100 to 1000 캜 for 60 seconds or more, And the amount of the Nb carbonitride and the Lavess phase can be controlled in an appropriate range by winding at a coiling temperature of 550 ° C or less after the hot rolling. As a result, it is found that the toughness of the Nb-containing ferritic stainless steel hot- And completed the present invention.

또, 본 발명자들은 이 Nb함유 페라이트계 스테인리스 열연 강판을 소둔한 후, 70%이상의 압하율로 냉연하고 소둔하는 것에 의해서 r값을 1.2이상으로 높일 수 있고, 그 결과로서 Nb함유 페라이트계 스테인리스 냉연 강판의 가공성이 향상하는 것을 발견하고, 본 발명을 완성하기에 이르렀다.The inventors of the present invention have found that when the Nb-containing ferritic stainless steel hot-rolled steel sheet is annealed, the r value can be increased to 1.2 or more by cold rolling and annealing at a reduction ratio of 70% or more. As a result, And the present invention has been accomplished.

즉, 본 발명은 C:0.030질량%이하, Si:2.00질량%이하, Mn:2.00질량%이하, P:0.050질량%이하, S:0.040질량%이하, Cr:10.00질량%∼25.00질량%, N:0.030질량%이하, Nb:0.01질량%∼0.80질량%를 함유하고, 잔부가 Fe 및 불가피한 불순물로 이루어지는 조성을 갖는 Nb함유 페라이트계 스테인리스 열연 강판으로서, Nb 탄질화물의 석출량이 0.2질량%이상이고, 또한 입경 0.1㎛이하의 라베스상이 면적 10㎛2당 10개 이하인 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 열연 강판이다.That is, the present invention relates to a ferritic stainless steel having a composition of C of 0.030 mass% or less, Si of 2.00 mass% or less, Mn of 2.00 mass% or less, P of 0.050 mass% or less, S of 0.040 mass% or less, Cr of 10.00 mass% 0.030 mass% or less of N, 0.01 mass% to 0.80 mass% of Nb, and the balance of Fe and unavoidable impurities, wherein the Nb carbonitride has a precipitation amount of 0.2 mass% or more , And the Lavess phase having a grain size of 0.1 탆 or less is 10 or less per 10 탆 2 of the area of the ferritic stainless steel hot-rolled steel sheet.

또, 본 발명은 C:0.030질량%이하, Si:2.00질량%이하, Mn:2.00질량%이하, P:0.050질량%이하, S:0.040질량%이하, Cr:10.00질량%∼25.00질량%, N:0.030질량%이하, Nb:0.01질량%∼0.80질량%를 함유하고, 잔부가 Fe 및 불가피한 불순물로 이루어지는 조성을 갖는 스테인리스강 슬래브를 열연할 때에, 1000℃∼1100℃의 온도에서 60초 이상 유지하는 동시에 마무리 열연 온도를 850℃이상으로 하고, 열연 후에 550℃이하의 권취 온도에서 권취하는 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 열연 강판의 제조 방법이다.The present invention also provides a method for producing a steel sheet, which comprises the steps of: C: not more than 0.030 mass%, Si: not more than 2.00 mass%, Mn: not more than 2.00 mass%, P: not more than 0.050 mass%, S: not more than 0.040 mass%, Cr: 10.00 to 25.00 mass% 0.030 mass% or less of N, 0.01 mass% to 0.80 mass% of Nb, and the balance of Fe and unavoidable impurities, at a temperature of 1000 占 폚 to 1100 占 폚 for at least 60 seconds when hot rolling a stainless steel slab At a coiling temperature of not less than 850 DEG C and winding up at a coiling temperature of not more than 550 DEG C after hot rolling.

또, 본 발명은 C:0.030질량%이하, Si:2.00질량%이하, Mn:2.00질량%이하, P:0.050질량%이하, S:0.040질량%이하, Cr:10.00질량%∼25.00질량%, N:0.030질량%이하, Nb:0.01질량%∼0.80질량%를 함유하고, 잔부가 Fe 및 불가피한 불순물로 이루어지는 조성을 갖는 Nb함유 페라이트계 스테인리스 냉연 강판으로서, Nb 탄질화물의 석출량이 0.2질량%이상이고, 입경 0.1㎛이하의 라베스상이 면적 10㎛2당 10개 이하이고, 또한 r값이 1.2이상인 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 냉연 강판이다.The present invention also provides a method for producing a steel sheet, which comprises the steps of: C: not more than 0.030 mass%, Si: not more than 2.00 mass%, Mn: not more than 2.00 mass%, P: not more than 0.050 mass%, S: not more than 0.040 mass%, Cr: 10.00 to 25.00 mass% 0.030 mass% or less of N, 0.01 mass% to 0.80 mass% of Nb, and the balance of Fe and unavoidable impurities, wherein the amount of precipitation of Nb carbonitride is 0.2 mass% or more , A Lavess phase having a grain size of 0.1 占 퐉 or less is 10 or less per 10 占 퐉 2 area, and an r-value is 1.2 or more.

또한, 본 발명은 상기의 Nb함유 페라이트계 스테인리스 열연 강판을 소둔한 후, 70%이상의 압하율에서 냉연하고 소둔하는 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 냉연 강판의 제조 방법이다.Further, the present invention is a method for producing an Nb-containing ferritic stainless steel cold rolled steel sheet characterized by annealing the above-mentioned Nb-containing ferritic stainless steel hot-rolled steel sheet, followed by cold rolling and annealing at a reduction ratio of 70% or more.

본 발명에 따르면, 인성 및 가공성이 우수한 Nb함유 페라이트계 스테인리스 열연 강판 및 그 제조 방법을 제공할 수 있다.According to the present invention, it is possible to provide an Nb-containing ferritic stainless steel hot-rolled steel sheet excellent in toughness and workability and a method of manufacturing the same.

또, 본 발명에 따르면, 가공성이 우수한 Nb함유 페라이트계 스테인리스 냉연 강판 및 그 제조 방법을 제공할 수 있다.Further, according to the present invention, it is possible to provide a Nb-containing ferritic stainless steel cold-rolled steel sheet excellent in workability and a method for producing the same.

<Nb함유 페라이트계 스테인리스 열연 강판>&Lt; Nb-containing ferritic stainless steel hot-rolled steel sheet >

본 발명의 Nb함유 페라이트계 스테인리스 열연 강판(이하, 「열연 강판」으로 생략하기도 함)은 C, Si, Mn, P, S, Cr, N, Nb를 함유하고, 잔부가 Fe 및 불가피한 불순물로 이루어지는 조성을 갖는다. 또, 본 발명의 열연 강판은 Ni, Mo, Cu, Co, Al, W, V, Ti, Zr, B, 희토류 원소, Ca의 1종 이상을 더 함유하는 조성을 갖고 있어도 좋다.The Nb-containing ferritic stainless steel hot-rolled steel sheet (hereinafter abbreviated as "hot-rolled steel sheet") of the present invention contains C, Si, Mn, P, S, Cr, N and Nb, and the balance of Fe and unavoidable impurities . The hot-rolled steel sheet of the present invention may have a composition containing at least one of Ni, Mo, Cu, Co, Al, W, V, Ti, Zr, B, rare earth elements and Ca.

이하, 본 발명의 열연 강판에 대해 상세하게 설명한다.Hereinafter, the hot-rolled steel sheet of the present invention will be described in detail.

<C:0.030질량%이하> <C: 0.030 mass% or less>

C는 강을 경질화시키고, 열연 강판의 인성을 저하시키는 요인으로 된다. 그 때문에, C의 함유량은 0.030질량%이하로 제한된다. 단, C의 함유량을 극도로 저하시킬 필요는 없으며, 일반적으로 0.001질량%∼0.030질량%, 바람직하게는 0.003질량%∼0.025질량%, 더욱 바람직하게는 0.005질량%∼0.020질량%의 C함유량으로 하면 좋다.C is a factor for hardening the steel and lowering the toughness of the hot-rolled steel sheet. Therefore, the content of C is limited to 0.030 mass% or less. However, the content of C does not need to be extremely reduced, and the content of C is generally from 0.001 mass% to 0.030 mass%, preferably from 0.003 mass% to 0.025 mass%, more preferably from 0.005 mass% to 0.020 mass% It is good.

<Si:2.00질량%이하, Mn:2.00질량%이하> <Si: 2.00 mass% or less, Mn: 2.00 mass% or less>

Si 및 Mn은 탈산제로서 유효한 것 이외에, 내고온 산화성을 향상시키는 작용을 갖는다. 특히, 내고온 산화성을 중시하는 경우에는 Si에 대해서는 0.05질량%이상, Mn에 대해서도 0.05질량%이상의 함유량을 확보하는 것이 효과적이다. 단, 이들 원소를 다량으로 함유시키면 강의 취화를 초래하는 요인으로 된다. 각종 검토의 결과, Si 및 Mn 모두 2.00질량%이하의 함유량으로 제한된다. Si 및 Mn의 함유량은 모두 1.00질량%이하, 또는 0.50질량%이하로 관리해도 좋다. 또, Si 및 Mn의 함유량의 하한은 특히 한정되지 않지만, 일반적으로 0.05질량%, 바람직하게는 0.1질량%, 더욱 바람직하게는 0.15질량%이다.Si and Mn are effective as a deoxidizing agent and have an action of improving the high-temperature oxidation resistance. Particularly, in the case where the high-temperature oxidation resistance is emphasized, it is effective to secure a content of 0.05 mass% or more for Si and a content of 0.05 mass% or more for Mn. However, if these elements are contained in a large amount, it becomes a cause of embrittlement of steel. As a result of various examinations, the contents of both Si and Mn are limited to not more than 2.00 mass%. The content of both Si and Mn may be controlled to 1.00 mass% or less, or 0.50 mass% or less. The lower limit of the content of Si and Mn is not particularly limited, but is generally 0.05% by mass, preferably 0.1% by mass, more preferably 0.15% by mass.

<P:0.050질량%이하, S:0.040질량%이하> <P: 0.050 mass% or less, S: 0.040 mass% or less>

P 및 S는 다량으로 함유하면 내식성 저하 등의 요인으로 될 수 있다. 그 때문에, P의 함유량은 0.050질량%이하, S의 함유량은 0.040질량%이하로 제한된다. 통상, P의 함유량은 0.010질량%∼0.050질량%, S의 함유량은 0.0005질량%∼0.040질량%의 범위로 하면 좋다. 또, P의 바람직한 함유량은 0.020질량%∼0.040질량%, S의 바람직한 함유량은 0.001질량%∼0.010질량%이다. 특히, 내식성을 중시하는 경우에는 S의 함유량을 0.005질량%이하로 제한하는 것이 효과적이다.When P and S are contained in a large amount, they may be factors such as degradation of corrosion resistance. Therefore, the content of P is limited to 0.050 mass% or less, and the content of S is limited to 0.040 mass% or less. Usually, the content of P is 0.010 mass% to 0.050 mass%, and the content of S is 0.0005 mass% to 0.040 mass%. The preferable content of P is 0.020 mass% to 0.040 mass%, and the preferable content of S is 0.001 mass% to 0.010 mass%. In particular, when the corrosion resistance is important, it is effective to limit the S content to 0.005 mass% or less.

<Cr:10.00질량%∼25.00질량%> &Lt; Cr: 10.00 mass% to 25.00 mass%

Cr은 스테인리스강으로서의 내식성을 확보하기 위해 중요한 원소인 동시에, 내고온 산화성의 향상에도 유효하다. 이들 작용을 발휘시키기 위해서는 10.00질량%이상의 Cr함유량이 필요하게 된다. Cr의 함유량은 바람직하게는 13.50질량%이상, 더욱 바람직하게는 17.00질량%이상으로 하는 것이, 상기의 작용을 발휘시키는 점에서 효과적이다. 한편, 다량으로 Cr을 함유시키면, 강의 경질화 및 인성 저하에 의해서 두꺼운 게이지 열연 강판의 제조성이 곤란하게 된다. 각종 검토의 결과, Cr의 함유량은 25.00질량%이하, 바람직하게는 22.00질량%이하, 더욱 바람직하게는 20.00질량%이하로 제한된다.Cr is an important element for securing corrosion resistance as stainless steel, and is also effective in improving the high-temperature oxidation resistance. In order to exhibit these effects, a chromium content of 10.00 mass% or more is required. The content of Cr is preferably 13.50% by mass or more, and more preferably 17.00% by mass or more in terms of exerting the above-mentioned action. On the other hand, when Cr is contained in a large amount, hardening of the steel and deterioration of toughness make it difficult to produce a thick gauge hot-rolled steel sheet. As a result of various examinations, the Cr content is limited to 25.00 mass% or less, preferably 22.00 mass% or less, more preferably 20.00 mass% or less.

<N:0.030질량%이하><N: 0.030 mass% or less>

N은 인성을 저하시키는 요인으로 된다. 그 때문에, N의 함유량은 0.030질량%이하로 제한된다. 단, N의 함유량을 극도로 저하시킬 필요는 없으며, 일반적으로 0.001질량%∼0.030질량%, 바람직하게는 0.005질량%∼0.025질량%의 N함유량으로 하면 좋다.N is a factor for lowering toughness. Therefore, the content of N is limited to 0.030 mass% or less. However, it is not necessary to extremely reduce the content of N, and the content of N may be generally 0.001 mass% to 0.030 mass%, preferably 0.005 mass% to 0.025 mass%.

<Nb:0.01질량%∼0.80질량%> &Lt; Nb: 0.01 mass% to 0.80 mass%

Nb는 C 및 N을 고정시키는 것에 의해서 Cr 탄질화물(탄화물·질화물)의 입계 편석을 억제하고, 강의 내식성 및 내고온 산화성을 높게 유지함에 있어서 극히 유효한 원소이다. 그 때문에, Nb의 함유량은 0.01질량%이상으로 할 필요가 있다. Nb의 함유량은 0.05질량%이상인 것이 효과적이며, 0.20질량%이상으로 하는 것이 더욱 효과적이다. 단, Nb의 함유량이 너무 높으면, 열연 강판의 인성 저하를 조장하므로 바람직하지 않다. 각종 검토의 결과, Nb의 함유량은 0.80질량%이하, 바람직하게는 0.60질량%이하로 제한된다.Nb is an extremely effective element in suppressing intergranular segregation of Cr carbonitride (carbide and nitride) by fixing C and N and keeping the corrosion resistance and high-temperature oxidation resistance of steel high. Therefore, the content of Nb must be 0.01 mass% or more. The content of Nb is effectively 0.05% by mass or more, more preferably 0.20% by mass or more. However, if the content of Nb is too high, the toughness of the hot-rolled steel sheet is lowered, which is undesirable. As a result of various examinations, the content of Nb is limited to 0.80 mass% or less, preferably 0.60 mass% or less.

<Ni:2.00질량%이하><Ni: 2.00 mass% or less>

Ni는 부식의 진행을 억제하는 작용이 있으며, 필요에 따라 첨가할 수 있다. 그 경우, 0.01질량%이상의 Ni함유량을 확보하는 것이 효과적이다. 단, 다량의 Ni를 함유시키면 가공성에 악영향을 미칠 수 있으므로, Ni를 첨가하는 경우에는 2.00질량%이하, 바람직하게는 1.00질량%이하의 범위에서 실행할 필요가 있다.Ni acts to inhibit the progress of corrosion and can be added as needed. In this case, it is effective to secure a Ni content of 0.01 mass% or more. However, the addition of a large amount of Ni may adversely affect the processability. Therefore, in the case of adding Ni, it is necessary to carry out the process in a range of 2.00 mass% or less, preferably 1.00 mass% or less.

<Mo:2.50질량%이하><Mo: 2.50 mass% or less>

Mo는 내식성의 향상에 유효한 원소이며, 필요에 따라 첨가할 수 있다. 그 경우, 0.02질량%이상의 Mo함유량을 확보하는 것이 효과적이며, 0.50질량%이상으로 하는 것이 더욱 효과적이다. 단, 다량의 Mo를 함유시키면 인성에 악영향을 미치므로, Mo를 첨가하는 경우에는 2.50질량%이하, 바람직하게는 1.50질량%이하의 범위에서 실행할 필요가 있다.Mo is an element effective for improving the corrosion resistance and can be added as needed. In this case, it is effective to secure an Mo content of 0.02 mass% or more, and it is more effective that the Mo content is 0.50 mass% or more. However, incorporation of a large amount of Mo adversely affects toughness. Therefore, in the case of adding Mo, it is necessary to carry out the treatment in a range of 2.50 mass% or less, preferably 1.50 mass% or less.

<Cu:1.80질량%이하><Cu: 1.80 mass% or less>

Cu는 저온 인성의 향상에 유효한 동시에, 고온 강도의 향상에도 유효한 원소이다. 그 때문에, 필요에 따라 Cu를 첨가할 수 있다. 그 경우, 0.02질량%이상의 Cu함유량을 확보하는 것이 효과적이다. 단, 다량으로 Cu를 첨가하면 가공성이 오히려 저하하게 된다. Cu를 첨가하는 경우에는 1.80질량%이하, 바람직하게는 0.80질량%이하의 범위에서 실행할 필요가 있다.Cu is effective for improvement of low-temperature toughness, and is effective for improvement of high-temperature strength. Therefore, Cu can be added as needed. In this case, it is effective to secure a Cu content of 0.02 mass% or more. However, when Cu is added in a large amount, the workability is lowered. In the case of adding Cu, it is necessary to perform the process in a range of 1.80 mass% or less, preferably 0.80 mass% or less.

<Co:0.50질량%이하><Co: 0.50 mass% or less>

Co는 저온 인성에 기여하는 원소이며, 필요에 따라 첨가할 수 있다. 그 경우, 0.010질량%이상의 Co함유량을 확보하는 것이 효과적이다. 단, Co의 과잉 첨가는 연성 저하의 요인으로 되므로, Co를 첨가하는 경우에는 0.50질량%이하의 범위에서 실행할 필요가 있다.Co is an element contributing to low-temperature toughness and can be added as needed. In this case, it is effective to secure a Co content of 0.010 mass% or more. However, excessive addition of Co causes deterioration of ductility, so in the case of adding Co, it is necessary to carry out the addition in a range of 0.50 mass% or less.

<Al:0.50질량%이하><Al: 0.50 mass% or less>

Al은 탈산제로서 유효한 원소이며, 필요에 따라 첨가할 수 있다. 그 경우, 0.005질량%이상의 Al함유량으로 하는 것이 효과적이다. 단, 다량의 Al을 함유시키면 인성 저하의 요인으로 된다. 그 때문에, Al을 함유시키는 경우, Al함유량은 0.50질량%이하, 바람직하게는 0.20질량%이하로 제한된다.Al is an effective element as a deoxidizing agent and can be added as needed. In this case, it is effective to make Al content of 0.005 mass% or more. However, if a large amount of Al is contained, the toughness is deteriorated. Therefore, when Al is contained, the Al content is limited to 0.50 mass% or less, preferably 0.20 mass% or less.

<W:1.80질량%이하, V:0.30질량%이하> <W: not more than 1.80 mass%, V: not more than 0.30 mass%

W 및 V는 고온 강도의 향상에 유효한 원소이며, 필요에 따라 이들한 1종 이상을 첨가할 수 있다. 그 경우, W에 대해서는 0.10질량%이상, V에 대해서도 0.10질량%이상의 함유량을 확보하는 것이 효과적이다. 단, 이들 원소를 다량으로 첨가하면 강이 경질로 되고, 냉연시에 깨짐을 초래하는 요인으로 된다. W를 첨가하는 경우에는 1.80질량%이하, 바람직하게는 0.50질량%이하의 범위에서 실행할 필요가 있다. V를 첨가하는 경우에는 0.30질량%이하, 바람직하게는 0.15질량%이하의 범위에서 실행할 필요가 있다.W and V are effective elements for improving the high temperature strength, and one or more of these can be added as needed. In this case, it is effective to secure a content of 0.10% by mass or more for W and a content of 0.10% by mass or more for V. However, when these elements are added in a large amount, the steel becomes hard and causes cracking during cold rolling. In the case of adding W, it is necessary to carry out the reaction in the range of 1.80 mass% or less, preferably 0.50 mass% or less. When V is added, it is necessary to carry out the reaction in the range of 0.30 mass% or less, preferably 0.15 mass% or less.

<Ti:0.50질량%이하, Zr:0.20질량%이하> <Ti: 0.50 mass% or less, Zr: 0.20 mass% or less>

Ti 및 Zr은 C 및 N을 고정시키는 작용이 있으며, 강의 내식성 및 내고온 산화성을 높게 유지함에 있어서 유효한 원소이다. 그 때문에, 필요에 따라 Ti, Zr의 1종 이상을 첨가할 수 있다. 그 경우, Ti에 대해서는 0.01질량%이상, Zr에 대해서는 0.02질량%이상의 함유량을 확보하는 것이 효과적이다. 단, 과잉의 Ti를 함유시키면 열연 코일의 인성 저하를 조장하므로, Ti를 첨가하는 경우에는 0.50질량%이하의 범위에서 실행할 필요가 있다. 또, 다량의 Zr을 함유시키면 가공성을 저해하는 요인으로 되므로, Zr을 첨가하는 경우에는 0.20질량%이하의 범위에서 실행할 필요가 있다.Ti and Zr have an action of fixing C and N, and are effective elements in maintaining high corrosion resistance and high-temperature oxidation resistance of steel. Therefore, one or more of Ti and Zr can be added as needed. In this case, it is effective to secure a content of 0.01 mass% or more for Ti and 0.02 mass% or more for Zr. Incorporation of excessive Ti promotes deterioration in the toughness of the hot-rolled coil, and therefore, in the case of adding Ti, it is necessary to carry out the addition in the range of 0.50 mass% or less. Incorporation of a large amount of Zr causes a deterioration in processability. Therefore, in the case of adding Zr, it is necessary to carry out the process in a range of 0.20 mass% or less.

<B:0.0050질량%이하><B: 0.0050 mass% or less>

B는 소량의 첨가에 의해서 내식성 및 가공성을 개선하는 원소이며, 필요에 따라 이들 1종 이상을 첨가할 수 있다. 그 경우, 0.0001질량%이상의 B함유량을 확보하는 것이 효과적이다. 단, 과잉의 B를 함유시키면 열간 가공성에 악영향을 미치므로, B를 첨가하는 경우에는 0.0050질량%이하의 범위에서 실행할 필요가 있다.B is an element which improves corrosion resistance and workability by the addition of a small amount, and one or more of them can be added as needed. In this case, it is effective to secure a B content of 0.0001 mass% or more. However, if B is added in excess, the hot workability is adversely affected. Therefore, in the case of adding B, it is necessary to perform the addition in a range of 0.0050 mass% or less.

<희토류 원소:0.100질량%이하, Ca:0.0050질량%이하> <Rare earth element: 0.100 mass% or less, Ca: 0.0050 mass% or less>

희토류 원소 및 Ca는 내고온 산화성의 향상에 유효한 원소이며, 필요에 따라 이들 1종 이상을 첨가할 수 있다. 그 경우, 희토류 원소는 0.001질량%이상, Ca는 0.0005질량%이상의 함유량을 확보하는 것이 효과적이다. 단, 이들 원소를 다량으로 첨가하면 인성이 저하하므로, 희토류 원소를 첨가하는 경우에는 0.100질량%이하, Ca를 첨가하는 경우에는 0.0050질량%이하의 함유량의 범위에서 실행할 필요가 있다.The rare earth element and Ca are effective elements for improving the high-temperature oxidation resistance, and one or more of them can be added as needed. In this case, it is effective to secure a content of 0.001% by mass or more of rare earth element and 0.0005% by mass or more of Ca. However, when the elements are added in a large amount, the toughness decreases. Therefore, it is necessary to carry out the addition in the range of 0.100 mass% or less in the case of adding the rare earth element and 0.0050 mass% or less in the case of Ca addition.

<잔부:Fe 및 불가피한 불순물>&Lt; Balance: Fe and unavoidable impurities >

상기 이외의 성분인 잔부는 Fe 및 불가피한 불순물로 이루어진다. 여기서, 불가피한 불순물은 제조 공정 중에 재료 중으로의 혼입을 피할 수 없는 불순물 원소의 것을 의미한다. 불가피한 불순물로서는 특히 한정되지 않는다.The remaining components other than the above are composed of Fe and unavoidable impurities. Here, an unavoidable impurity means an impurity element which can not avoid the incorporation into the material during the manufacturing process. The inevitable impurities are not particularly limited.

<Nb 탄질화물의 석출량이 0.2질량%이상, 입경 0.1㎛이하의 라베스상이 면적 10㎛2당 10개 이하>Nb carbonitride is not less than 0.2% by mass, and the Laveth phase having a particle size of not more than 0.1 占 퐉 is not more than 10 in an area of 10 占 퐉 2 >

Nb 탄질화물(탄화물·질화물) 및 라베스상은 열연 처리에 의해서 생성되는 석출물이다. C 및 N이 강 중에 고용된 상태에서 존재하면, 열연 강판의 인성이 저하하기 때문에, C 및 N은 Nb 탄질화물로서 석출시키는 것이 유효하다. 또, Nb 탄질화물을 석출시키는 것에 의해, 강 중에 고용되어 있는 Nb가 저감되고, 열연 강판의 인성을 저하시키는 라베스상의 석출량을 저감시킬 수 있다. 강 중에 고용되는 C 및 N을 저감하여 열연 강판의 인성을 향상시키기 위해서는 Nb 탄질화물의 석출량을 0.2질량%이상으로 할 필요가 있다. 또, 입경 0.1㎛이하의 라베스상을 면적 10㎛2당 10개 이하로 할 필요가 있다.Nb carbonitride (carbide · nitride) and Lavess phase are precipitates produced by hot rolling. When C and N are present in a solid state in the steel, the toughness of the hot-rolled steel sheet deteriorates. Therefore, it is effective to precipitate C and N as Nb carbonitrides. Further, Nb carbonitride is precipitated, Nb dissolved in the steel is reduced, and the amount of precipitation of the Laves phase, which lowers the toughness of the hot-rolled steel sheet, can be reduced. In order to reduce the C and N dissolved in the steel to improve the toughness of the hot-rolled steel sheet, the precipitation amount of the Nb carbonitride needs to be not less than 0.2 mass%. In addition, it is necessary to set the number of Laveth phases having a particle diameter of 0.1 탆 or less to 10 or less per 10 탆 2 area.

여기서, Nb 탄질화물의 석출량(질량%)은 10질량%의 아세틸아세톤+1질량%의 테트라메틸암모늄 클로라이드+89질량%의 메틸 알코올의 혼합액을 이용하며, 포화 감홍 기준전극에 대해 -100mV∼400mV의 SCE 전위에서 석출물의 잔사를 전해 추출한 후, 추출한 잔사를 0.2㎛의 미크로포어 필터로 여과하고, 그 중량과 전체 용해 중량의 비로부터 산출하였다.Here, the precipitation amount (mass%) of the Nb carbonitride is 10% by mass of acetylacetone + 1% by mass of tetramethylammonium chloride + 89% by mass of methyl alcohol, After the residue of the precipitate was electrolytically extracted at a SCE potential of 400 mV, the extracted residue was filtered with a 0.2 μm micropore filter, and the ratio was calculated from the ratio of the weight to the total dissolved weight.

또, 라베스상에 대해서는 주사형 전자 현미경(SEM)을 이용하여 표면의 사진을 촬영하고, 라베스상의 사이즈를 측정하는 동시에, 면적 10㎛2당 입경 0.1㎛이하의 라베스상의 개수를 계측하였다. 라베스상의 개수는 적어도 5개의 포인트에서 계측하고, 그 평균값을 취하였다.Also, the number was measured on the LA for the bath using a scanning electron microscope (SEM) by taking pictures of the surface and, at the same time to measure the size on the Laves, the area 10㎛ 2 0.1㎛ per particle diameter less Laves . The number of Laveth phases was measured at at least five points and the average value was taken.

<두께><Thickness>

본 발명의 열연 강판의 두께는 용도에 따라 적절히 설정하면 좋으며 특히 한정되지 않는다. 예를 들면, 본 발명의 열연 강판을 자동차의 배기관 플랜지 부품의 제조에 이용하는 경우, 열연 강판의 두께는 일반적으로 5.0㎜∼11.0㎜, 바람직하게는 5.5㎜∼9.0㎜이다. 또, 본 발명의 열연 강판을 자동차의 배기관 부품의 제조에 이용하는 경우, Nb함유 페라이트계 스테인리스 냉연 강판(이하, 「냉연 강판」으로 생략하기도 함)의 가공성의 지표인 r값을 향상시키기 위해, 본 발명의 열연 강판을 냉연할 때에 압하율을 크게 할 필요가 있다. 따라서, 자동차의 배기관 부품을 제조하기 위해 이용되는 냉연 강판의 두께 및 냉연 압하율을 고려하면, 열연 강판의 두께는 통상, 4.5㎜초과 10.00㎜이하이다. 또, 열연 강판의 두께는 바람직하게는 5.0㎜∼9.0㎜, 더욱 바람직하게는 5.5㎜∼8.0㎜이다.The thickness of the hot-rolled steel sheet of the present invention may be suitably set according to the application, and is not particularly limited. For example, when the hot-rolled steel sheet of the present invention is used for manufacturing an exhaust pipe flange part of an automobile, the thickness of the hot-rolled steel sheet is generally 5.0 mm to 11.0 mm, preferably 5.5 mm to 9.0 mm. When the hot-rolled steel sheet of the present invention is used for manufacturing exhaust pipe parts of an automobile, in order to improve the r-value which is an index of the workability of the Nb-containing ferritic stainless steel cold-rolled steel sheet (hereinafter, It is necessary to increase the reduction rate when cold rolling the hot-rolled steel sheet of the invention. Therefore, the thickness of the hot-rolled steel sheet is usually more than 4.5 mm but not more than 10.00 mm in consideration of the thickness of the cold-rolled steel sheet used for manufacturing an exhaust pipe part of an automobile and the cold- The thickness of the hot-rolled steel sheet is preferably 5.0 mm to 9.0 mm, and more preferably 5.5 mm to 8.0 mm.

<Nb함유 페라이트계 스테인리스 열연 강판의 제조 방법>&Lt; Process for producing a ferritic stainless steel hot-rolled steel sheet containing Nb >

상기와 같은 특징을 갖는 본 발명의 Nb함유 페라이트계 스테인리스 열연 강판은 상기의 Nb함유 페라이트계 스테인리스 열연 강판과 동일한 조성을 갖는 스테인리스강 슬래브를 열연할 때에, 1000℃∼1100℃의 온도에서 60초 이상 유지하는 동시에 마무리 열연 온도를 850℃이상으로 하고, 열연 후에 550℃이하의 권취 온도에서 권취하는 것에 의해서 제조할 수 있다.The Nb-containing ferritic stainless steel hot-rolled steel sheet having the above-described characteristics of the present invention is characterized in that when hot rolling a stainless steel slab having the same composition as that of the Nb-containing ferritic stainless steel hot-rolled steel sheet at the temperature of 1000 캜 to 1100 캜 for at least 60 seconds At the same time, winding the hot rolled steel sheet at a coiling temperature of 550 DEG C or lower after hot rolling at a hot rolling temperature of 850 DEG C or higher.

열연에 앞서, 통상, 스테인리스강 슬래브는 가열된다. 스테인리스강 슬래브의 가열 온도는 특히 한정되지 않지만, 바람직하게는 1200℃∼1300℃이다. 스테인리스강 슬래브의 가열 온도가 1200℃미만이면, 열연에 의한 왜곡이 과도하게 도입되고, 그 후의 조직 제어가 곤란하게 되는 것 이외에, 표면 손상이 문제가 되는 경우가 있다. 한편, 스테인리스강 슬래브의 가열 온도가 1300℃를 넘으면, 조직이 조립화되어 버려, 원하는 특성을 갖는 열연 강판이 얻어지지 않는 경우가 있다.Prior to hot rolling, the stainless steel slab is usually heated. The heating temperature of the stainless steel slab is not particularly limited, but is preferably 1200 ° C to 1300 ° C. If the heating temperature of the stainless steel slab is less than 1200 deg. C, the distortion due to hot rolling is excessively introduced, the subsequent structure control becomes difficult, and surface damage may be a problem in some cases. On the other hand, if the heating temperature of the stainless steel slab exceeds 1300 占 폚, the structure may be assembled and the hot-rolled steel sheet having the desired characteristics may not be obtained.

상기와 같이 해서 스테인리스강 슬래브를 가열한 후, 열연이 실행된다. 열연은 통상, 복수 패스의 거친 열연 및 복수 패스의 마무리 열연을 포함한다. 열연시, Nb 탄질화물의 석출을 효율적으로 촉진하면서 라베스상의 석출을 저감하기 위해, 1000℃∼1100℃의 온도에서 60초 이상 유지하는 동시에, 마무리 열연 온도를 850℃이상으로 할 필요가 있다. 여기서, 유지 온도를 1000℃∼1100℃로 하는 이유는 Nb 탄질화물의 석출 온도가 1100℃이하이고, 특히 해당 유지 온도로 하는 것에 의해서 Nb 탄질화물의 석출을 효율적으로 촉진시킬 수 있기 때문이다. 유지 시간 및 유지 시간이 상기 범위 밖이면, Nb 탄질화물이 충분히 석출되지 않는다. 또, 마무리 열연 온도가 850℃미만이면, 라베스상의 석출 온도가 800℃ 부근이기 때문에, 라베스상의 석출을 충분히 저감시킬 수 없다.After the stainless steel slab is heated as described above, hot rolling is performed. Hot rolled usually includes multiple passes of coarse hot rolled and multiple passes of hot rolled coils. It is necessary to keep the temperature at 1000 占 폚 to 1100 占 폚 for at least 60 seconds and to set the finish hot rolling temperature to 850 占 폚 or more in order to efficiently promote the precipitation of Nb carbonitride during hot rolling and to reduce precipitation of the Lavess phase. The reason why the holding temperature is set to 1000 to 1100 占 폚 is that the precipitation temperature of the Nb carbonitride is 1100 占 폚 or less, particularly, the holding temperature can effectively promote the precipitation of the Nb carbonitride. If the holding time and the holding time are out of the above range, the Nb carbonitride is not sufficiently precipitated. If the finish hot rolling temperature is less than 850 DEG C, the precipitation temperature of the Laves phase is in the vicinity of 800 DEG C, so that precipitation of the Laves phase can not be sufficiently reduced.

1000℃∼1100℃의 온도에서 60초 이상 유지하는 방법으로서는 특히 한정되지 않으며, 통판 속도를 저하시키거나, 마무리 압연 전에 딜레이를 도입하면 좋다.The method of maintaining at a temperature of 1000 deg. C to 1100 deg. C for 60 seconds or longer is not particularly limited, and it is preferable to lower the passing speed or to introduce a delay before the finish rolling.

또, 1000℃∼1100℃의 온도에서 60초 이상 유지하는 타이밍은 열연 공정의 동안이면 특히 한정되지 않지만, 거친 열연의 종기부터 마무리 열연의 초기에 걸쳐 실행하는 것이 바람직하다.The timing of holding at a temperature of 1000 占 폚 to 1100 占 폚 for 60 seconds or longer is not particularly limited as long as it is during the hot rolling step, but it is preferable to carry out the timing from the beginning of rough hot rolling to the beginning of finish hot rolling.

마무리 열연 시간은 특히 한정되지 않으며, 해당 기술 분야에 있어서 공지의 열연 방법에 준하여 설정할 수 있다. 일반적으로, 마무리 열연 시간은 열연 공정의 토탈 시간과의 밸런스를 고려하여 결정되지만, 마무리 열연 시간이 길수록 Nb 탄질화물의 석출량이 증대한다.The finishing hot rolling time is not particularly limited and can be set in accordance with a known hot rolling method in the related art. In general, the finish hot rolling time is determined in consideration of the balance with the total time of the hot rolling process, but the longer the finish hot rolling time, the greater the amount of Nb carbonitride deposited.

열연 후, 550℃이하의 권취 온도에서 권취하여 코일로 한다. 권취 온도가 550℃를 넘으면, 라베스상이 석출되며, 인성이 저하해 버리는 경우가 있다.After hot rolling, the steel is taken up at a coiling temperature of 550 DEG C or less to obtain a coil. If the coiling temperature exceeds 550 DEG C, the Lavess phase precipitates and the toughness may decrease.

또, 상기와 같이 해서 얻어진 열연 강판은 열연 공정에 있어서 Nb 탄질화물의 석출량을 충분히 증대시키고 있기 때문에, 라베스상의 석출 온도(800℃ 부근)로 되어도 라베스상이 석출하기 어렵다. 그 때문에, 열연 강판을 권취하기 전에 수냉 등에 의해서 급랭하고, 라베스상의 석출 온도의 통과 시간을 짧게 하는 방법을 이용할 필요성은 적다.Further, the hot-rolled steel sheet thus obtained sufficiently increases the precipitation amount of the Nb carbonitride in the hot rolling step, so that the Lavess phase hardly precipitates even when the precipitation temperature of the Lavess phase (around 800 ° C) is reached. Therefore, it is not necessary to use a method of quenching by water cooling or the like before winding the hot-rolled steel sheet and shortening the passing time of the precipitation temperature of the Laves phase.

<Nb함유 페라이트계 스테인리스 냉연 강판 및 그 제조 방법>&Lt; Nb-containing ferritic stainless steel cold-rolled steel sheet and manufacturing method thereof &

본 발명의 냉연 강판은 상기의 열연 강판의 특징에 부가하여, r값이 1.2이상이라는 특징을 갖는다. 그 때문에, 본 발명의 냉연 강판은 가공성이 우수하며, 각종 가공을 실행하는 것에 의해, 배기 매니폴드, 프런트 파이프, 센터 파이프, 촉매 컨버터 외부통 등의 자동차의 배기관 부품을 제조할 수 있다.The cold-rolled steel sheet of the present invention has a feature that the r value is 1.2 or more in addition to the above-mentioned characteristics of the hot-rolled steel sheet. Therefore, the cold-rolled steel sheet of the present invention is excellent in workability and can be used to manufacture exhaust pipe parts for automobiles such as an exhaust manifold, a front pipe, a center pipe, and an outer catalytic converter.

상기와 같은 특징을 갖는 본 발명의 냉연 강판은 상기의 열연 강판을 소둔한 후, 70%이상의 압하율에서 냉연하고 소둔하는 것에 의해서 제조할 수 있다.The cold-rolled steel sheet of the present invention having the above-described characteristics can be produced by annealing the hot-rolled steel sheet, followed by cold rolling and annealing at a reduction ratio of 70% or more.

냉연에 앞서, 열연 강판의 소둔이 실행된다. 소둔은 재결정 조직이 얻어지는 온도에서 실행된다. 소둔 온도는 열연 강판의 조성에 따라 적절히 설정하면 좋으며 특히 한정되지 않지만, 통상 950℃∼1150℃이다. 소둔 온도가 950℃미만이면, 재결정 조직이 얻어지지 않는 경우가 있다. 한편, 소둔 온도가 1150℃를 넘으면, 결정립이 조대화되는 경우가 있다.Annealing of the hot-rolled steel sheet is performed prior to cold rolling. Annealing is carried out at a temperature at which a recrystallized structure is obtained. The annealing temperature may be suitably set according to the composition of the hot-rolled steel sheet, and is not particularly limited, but is usually 950 to 1150 占 폚. If the annealing temperature is lower than 950 占 폚, a recrystallized structure may not be obtained. On the other hand, when the annealing temperature exceeds 1150 占 폚, crystal grains may be coarsened.

냉연은 냉연 강판의 r값을 1.2이상으로 높이기 위해, 70%이상의 압하율에서 실행된다. 압하율이 70%미만이면, 냉연 강판의 r값이 1.2미만으로 된다.Cold rolling is performed at a reduction rate of 70% or more in order to increase the r value of the cold-rolled steel sheet to 1.2 or more. If the reduction rate is less than 70%, the r value of the cold-rolled steel sheet becomes less than 1.2.

냉연 후, 냉연 강판의 소둔이 실행된다. 소둔은 재결정 조직이 얻어지는 온도에서 실행된다. 소둔 온도는 냉연 강판의 조성에 따라 적절히 설정하면 좋고, 특히 한정되지 않지만, 통상 1000℃∼1100℃이다. 소둔 온도가 1000℃미만이면, 재결정 조직이 얻어지지 않는 경우가 있다. 소둔 온도가 1100℃를 넘으면, 결정립이 조대화되고, 가공시에 거친 표면이 생겨 깨짐의 원인으로 되는 경우가 있다.After cold rolling, annealing of the cold-rolled steel sheet is performed. Annealing is carried out at a temperature at which a recrystallized structure is obtained. The annealing temperature may be appropriately set according to the composition of the cold-rolled steel sheet, and is not particularly limited, but is usually 1000 ° C to 1100 ° C. If the annealing temperature is less than 1000 캜, a recrystallized structure may not be obtained. When the annealing temperature exceeds 1100 占 폚, the crystal grains are coarse, and a rough surface is formed at the time of processing, which may cause cracking.

[실시예][Example]

이하, 실시예에 의해서 본 발명을 또한 설명하겠지만, 본 발명은 이들 실시예에 의해서 한정되는 것은 아니다.Hereinafter, the present invention will be further described by way of examples, but the present invention is not limited to these examples.

표 1에 나타내는 성분 조성의 강을 용제하여 스테인리스강 슬래브로 하고, 표 1에 나타내는 조건으로 열압하는 것에 의해서 소정의 두께를 갖는 Nb함유 페라이트계 스테인리스 열연 강판을 얻었다.Nb-containing ferritic stainless steel hot-rolled steel sheets having a predetermined thickness were obtained by subjecting the steels having the constituent compositions shown in Table 1 to a stainless steel slab under the conditions shown in Table 1.

[표 1][Table 1]

Figure pct00001
Figure pct00001

다음에, 얻어진 Nb함유 페라이트계 스테인리스 열연 강판으로부터 시험편을 채취하고, Nb 탄질화물의 석출량, 라베스상의 사이즈, 면적 10㎛2당 입경 0.1㎛이하의 라베스상의 양 및 인성에 대해 평가를 실행하였다.Next, Nb-containing ferritic stainless steel test pieces sampled from the hot-rolled steel sheet, and executing the evaluation of the amount and toughness on the Nb carbonitride precipitation amount, Laves on the size of the cargo area 10㎛ 2 la of each particle size below 0.1㎛ bath obtained Respectively.

Nb 탄질화물의 석출량과, 라베스상의 사이즈 및 개수는 상기한 방법에 의해서 측정하였다. 또한, Nb 탄질화물의 석출량의 측정에 있어서 SCE 전위는 400mV로 하였다. 또, 인성은 U노치 시험편에서의 샤루피 충격시험에 의해서 평가를 실행하였다. 인성의 합격 여부는 연성-취성 천이 온도(DBTT)가 20℃이하에서 인성이 있음(○)으로 평가하였다.The amount of precipitation of Nb carbonitride and the size and number of the Lavess phase were measured by the method described above. The SCE potential in the measurement of the deposition amount of the Nb carbonitride was set to 400 mV. The toughness was evaluated by Sharruff impact test on the U-notch test piece. The acceptability of the toughness was evaluated as toughness (O) at the ductility-brittle transition temperature (DBTT) of 20 ° C or lower.

상기의 각 평가의 결과를 표 2에 나타낸다.The results of the above evaluations are shown in Table 2.

[표 2][Table 2]

Figure pct00002
Figure pct00002

표 2에 나타내는 바와 같이, 스테인리스강 슬래브를 열연할 때에, 1000℃∼1100℃의 온도에서 60초 이상 유지하는 동시에 마무리 열연 온도를 850℃이상으로 하고, 열연 후에 550℃이하의 권취 온도에서 권취하는 것에 의해서 제조한 No.1∼8의 Nb함유 페라이트계 스테인리스 열연 강판은 Nb 탄질화물의 석출량이 0.2질량%이상, 입경 0.1㎛이하의 라베스상이 면적 10㎛2당 10개 이하이며, 인성이 우수한 것이 확인되었다.As shown in Table 2, when the stainless steel slab is hot-rolled, the hot-rolled steel sheet is held at a temperature of 1000 ° C to 1100 ° C for 60 seconds or longer, the hot rolling temperature is 850 ° C or higher, Nb-containing ferritic stainless steel hot-rolled steel sheets manufactured by Nos. 1 to 8 were found to have a precipitation amount of Nb carbonitride of 0.2 mass% or more, a Laves phase of 0.1 탆 or less in grain size of 10 탆 or less per 2 square pieces, .

이에 대해, 스테인리스강 슬래브를 열연할 때에 1000℃∼1100℃의 온도에서의 유지 시간이 너무 짧은 No.9∼12의 Nb함유 페라이트계 스테인리스 열연 강판은 Nb 탄질화물의 석출량이 적고, 라베스상의 양도 많아지며, 인성이 충분하지 않은 것을 알 수 있었다.On the other hand, Nb-containing ferritic stainless steel hot-rolled steel sheets Nos. 9 to 12 having a too short holding time at a temperature of 1000 ° C to 1100 ° C at the time of hot-rolling a stainless steel slab have a small amount of precipitation of Nb carbonitride, And it was found that the personality was not sufficient.

또, 상기에서 얻어진 Nb함유 페라이트계 스테인리스 열연 강판을 이용하고, 배기관 플랜지 부품으로의 가공을 모의한 냉간 단조 시험, 프레스 천공 시험, 절삭 시험을 실행하였다. 그 결과, No.1∼8의 Nb함유 페라이트계 스테인리스 열연 강판에서는 원하는 형상으로의 가공성이 양호하고, 인성 부족 등에 기인하는 깨짐 등도 발생하지 않았다. 이에 대해, No. 9∼12의 Nb함유 페라이트계 스테인리스 열연 강판에서는 인성 부족에 기인한 깨짐이 발생하였다.The Nb-containing ferritic stainless steel hot-rolled steel sheet thus obtained was subjected to a cold forging test, a press drilling test, and a cutting test simulating working on an exhaust pipe flange part. As a result, Nb-containing ferritic stainless steel hot-rolled steel sheets Nos. 1 to 8 exhibited good workability in a desired shape, and cracks due to insufficient toughness and the like did not occur. On the contrary, Cracks due to lack of toughness occurred in Nb-containing ferritic stainless steel hot-rolled steel sheets of 9 to 12.

다음에, 상기에서 얻어진 No.1∼7의 Nb함유 페라이트계 스테인리스 열연 강판을 소둔한 후, 냉연하고, 또한 소둔하여 Nb함유 페라이트계 스테인리스 냉연 강판을 얻었다. 이 때의 제조 조건에 대해서는 표 3에 나타낸다. 또한, No.9∼12의 Nb함유 페라이트계 스테인리스 열연 강판은 인성이 낮고, 냉연을 실행할 수 없었다.Next, the Nb-containing ferritic stainless steel hot-rolled steel sheets Nos. 1 to 7 obtained above were annealed, cold rolled, and annealed to obtain a Nb-containing ferritic stainless steel cold-rolled steel sheet. The production conditions at this time are shown in Table 3. Further, Nb-containing ferritic stainless steel hot-rolled steel sheets No. 9 to No. 12 had low toughness and could not be cold-rolled.

다음에, 얻어진 Nb함유 페라이트계 스테인리스 냉연 강판에 대해 r값을 구하였다. r값은 Nb함유 페라이트계 스테인리스 냉연 강판으로부터 JIS13호 B 인장 시험편을 채취하고, 14.4% 왜곡을 부여한 후에, 하기 (1)식 및 하기 (2)식을 이용하여 평균 r값을 산출하였다.Next, the r value of the obtained Nb-containing ferritic stainless steel cold-rolled steel sheet was determined. The r value was obtained from the Nb-containing ferritic stainless steel cold-rolled steel sheet and JIS No. 13 B tensile test specimen was taken and subjected to 14.4% distortion, and then the average r value was calculated using the following formulas (1) and (2).

r=ln(W0/W)/ln(t0/t) (1) r = ln (W 0 / W ) / ln (t 0 / t) (1)

여기서, W0은 인장 전의 판 폭, W는 인장 후의 판 폭, t0은 인장 전의 판 두께, t는 인장 후의 판 두께이다.Here, W 0 is plate width before stretching, W is plate width after stretching, t 0 is plate thickness before stretching, and t is plate thickness after stretching.

평균 r값 =(r0+2r45+r90)/4 (2) Average r value = (r 0 + 2r 45 + r 90 ) / 4 (2)

여기서, r0은 압연 방향의 r값, r45는 압연 방향과 45° 방향의 r값, r90은 압연 방향과 직각 방향의 r값이다.Where r 0 is the r value in the rolling direction, r 45 is the r value in the direction of 45 ° to the rolling direction, and r 90 is the r value in the direction perpendicular to the rolling direction.

또한, 복잡한 형상이 요구되는 자동차의 배기관 부품에서는 평균 r값이 1.2이상이면 충분히 가공할 수 있는 특성이기 때문에, 평균 r값이 1.2이상이면 가공성이 우수하다고 판단할 수 있다.Further, in an exhaust pipe part of an automobile in which a complicated shape is required, it can be sufficiently processed if the average r value is 1.2 or more. Therefore, it can be judged that the workability is excellent when the average r value is 1.2 or more.

상기의 평가 결과를 표 3에 나타낸다.The evaluation results are shown in Table 3.

[표 3][Table 3]

Figure pct00003
Figure pct00003

표 3에 나타내는 바와 같이, 70%이상의 압하율에서 냉연한 No.1∼5 및 7의 Nb함유 페라이트계 스테인리스 냉연 강판은 r값이 1.2이상이며, 가공성이 우수한 것이 확인되었다.As shown in Table 3, it was confirmed that the Nb-containing ferritic stainless steel cold-rolled steel sheets Nos. 1 to 5 and 7 which were cold rolled at a reduction ratio of 70% or more had an r value of 1.2 or more and excellent workability.

이에 대해, 70%미만의 압하율에서 냉연한 No.6의 Nb함유 페라이트계 스테인리스 냉연 강판은 r값이 1.2미만이며, 가공성이 충분하지 않은 것을 알 수 있었다.On the other hand, the Nb-containing ferritic stainless steel cold-rolled steel sheet No. 6 cold-rolled at a reduction ratio of less than 70% had an r-value of less than 1.2, indicating that the workability was not sufficient.

이상의 결과로부터 알 수 있는 바와 같이, 본 발명에 의하면, 인성 및 가공성이 우수한 Nb함유 페라이트계 스테인리스 열연 강판 및 그 제조 방법을 제공할 수 있다. 또, 본 발명에 의하면, 가공성이 우수한 Nb함유 페라이트계 스테인리스 냉연 강판 및 그 제조 방법을 제공할 수 있다.As can be seen from the above results, according to the present invention, it is possible to provide a Nb-containing ferritic stainless steel hot-rolled steel sheet excellent in toughness and workability and a manufacturing method thereof. Further, according to the present invention, it is possible to provide a Nb-containing ferritic stainless steel cold-rolled steel sheet excellent in workability and a manufacturing method thereof.

또한, 본 출원은 2016년 2월 2일에 출원한 일본국 특허 출원 제2016-017883호에 의거하는 우선권을 주장하는 것이며, 이 일본국 특허 출원의 전체 내용을 본 출원에 원용한다.The present application is also based on Japanese Patent Application No. 2016-017883 filed on February 2, 2016, the entire contents of which is incorporated herein by reference.

Claims (9)

C:0.030질량%이하, Si:2.00질량%이하, Mn:2.00질량%이하, P:0.050질량%이하, S:0.040질량%이하, Cr:10.00질량%∼25.00질량%, N:0.030질량%이하, Nb:0.01질량%∼0.80질량%를 함유하고, 잔부가 Fe 및 불가피한 불순물로 이루어지는 조성을 갖는 Nb함유 페라이트계 스테인리스 열연 강판으로서,
Nb 탄질화물의 석출량이 0.2질량%이상이고, 또한 입경 0.1㎛이하의 라베스상이 면적 10㎛2당 10개 이하인 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 열연 강판.C: not more than 0.030 mass%, Si: not more than 2.00 mass%, Mn: not more than 2.00 mass%, P: not more than 0.050 mass%, S: not more than 0.040 mass%, Cr: 10.00 to 25.00 mass% By mass of Nb, 0.01% by mass to 0.80% by mass of Nb, and the balance of Fe and unavoidable impurities, wherein the ferrite-
Nb-containing ferritic stainless steel hot-rolled steel sheet characterized in that the precipitation amount of Nb carbonitride is 0.2 mass% or more and the Lavess phase having a grain size of 0.1 탆 or less is 10 or less per 10 탆 2 area. 제 1 항에 있어서,
Ni:2.00질량%이하, Mo:2.50질량%이하, Cu:1.80질량%이하, Co:0.50질량%이하, Al:0.50질량%이하, W:1.80질량%이하, V:0.30질량%이하, Ti:0.50질량%이하, Zr:0.20질량%이하, B:0.0050질량%이하, 희토류 원소:0.100질량%이하, Ca:0.0050질량%이하의 1종 이상을 더 함유하는 조성을 갖는 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 열연 강판.The method according to claim 1,
0.50 mass% or less of Al, 0.50 mass% or less of Al, 1.80 mass% or less of W, 0.30 mass% or less of V, 0.30 mass% or less of Ti, 2.5 mass% or less of Ni, 2.50 mass% or less of Mo, : 0.50 mass% or less, Zr: 0.20 mass% or less, B: 0.0050 mass% or less, rare earth element: 0.100 mass% or less, and Ca: 0.0050 mass% Ferritic stainless steel hot rolled steel sheet. 제 1 항 또는 제 2 항에 있어서,
배기관 플랜지 부품의 제조에 이용되는 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 열연 강판.3. The method according to claim 1 or 2,
A ferritic stainless steel hot-rolled steel sheet containing Nb, which is used for manufacturing exhaust pipe flange parts. C:0.030질량%이하, Si:2.00질량%이하, Mn:2.00질량%이하, P:0.050질량%이하, S:0.040질량%이하, Cr:10.00질량%∼25.00질량%, N:0.030질량%이하, Nb:0.01질량%∼0.80질량%를 함유하고, 잔부가 Fe 및 불가피한 불순물로 이루어지는 조성을 갖는 스테인리스강 슬래브를 열연할 때에, 1000℃∼1100℃의 온도에서 60초 이상 유지하는 동시에 마무리 열연 온도를 850℃이상으로 하고, 열연 후에 550℃이하의 권취 온도에서 권취하는 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 열연 강판의 제조 방법.C: not more than 0.030 mass%, Si: not more than 2.00 mass%, Mn: not more than 2.00 mass%, P: not more than 0.050 mass%, S: not more than 0.040 mass%, Cr: 10.00 to 25.00 mass% Or less and a composition comprising 0.01 to 0.80 mass% of Nb and the balance of Fe and unavoidable impurities, at a temperature of 1000 deg. C to 1100 deg. C for 60 seconds or longer, and at the same time, At a temperature of not lower than 850 캜, and after hot rolling, winding at a coiling temperature of 550 캜 or less. 제 4 항에 있어서,
Ni:2.00질량%이하, Mo:2.50질량%이하, Cu:1.80질량%이하, Co:0.50질량%이하, Al:0.50질량%이하, W:1.80질량%이하, V:0.30질량%이하, Ti:0.50질량%이하, Zr:0.20질량%이하, B:0.0050질량%이하, 희토류 원소:0.100질량%이하, Ca:0.0050질량%이하의 1종 이상을 더 함유하는 조성을 갖는 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 열연 강판의 제조 방법.5. The method of claim 4,
0.50 mass% or less of Al, 0.50 mass% or less of Al, 1.80 mass% or less of W, 0.30 mass% or less of V, 0.30 mass% or less of Ti, 2.5 mass% or less of Ni, 2.50 mass% or less of Mo, : 0.50 mass% or less, Zr: 0.20 mass% or less, B: 0.0050 mass% or less, rare earth element: 0.100 mass% or less, and Ca: 0.0050 mass% A method for manufacturing a ferritic stainless steel hot - rolled steel sheet. C:0.030질량%이하, Si:2.00질량%이하, Mn:2.00질량%이하, P:0.050질량%이하, S:0.040질량%이하, Cr:10.00질량%∼25.00질량%, N:0.030질량%이하, Nb:0.01질량%∼0.80질량%를 함유하고, 잔부가 Fe 및 불가피한 불순물로 이루어지는 조성을 갖는 Nb함유 페라이트계 스테인리스 냉연 강판으로서,
Nb 탄질화물의 석출량이 0.2질량%이상이고, 입경 0.1㎛이하의 라베스상이 면적 10㎛2당 10개 이하이고, 또한 r값이 1.2이상인 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 냉연 강판.C: not more than 0.030 mass%, Si: not more than 2.00 mass%, Mn: not more than 2.00 mass%, P: not more than 0.050 mass%, S: not more than 0.040 mass%, Cr: 10.00 to 25.00 mass% By mass of Nb, 0.01% by mass to 0.80% by mass of Nb, and the balance of Fe and unavoidable impurities, wherein the ferrite-
Nb-containing ferritic stainless steel cold-rolled steel sheet characterized in that the precipitation amount of Nb carbonitride is 0.2 mass% or more and the Lavess phase having a grain size of 0.1 占 퐉 or less is 10 or less per 10 占 퐉 2 area and the r value is 1.2 or more. 제 6 항에 있어서,
Ni:2.00질량%이하, Mo:2.50질량%이하, Cu:1.80질량%이하, Co:0.50질량%이하, Al:0.50질량%이하, W:1.80질량%이하, V:0.30질량%이하, Ti:0.50질량%이하, Zr:0.20질량%이하, B:0.0050질량%이하, 희토류 원소:0.100질량%이하, Ca:0.0050질량%이하의 1종 이상을 더 함유하는 조성을 갖는 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 냉연 강판.The method according to claim 6,
0.50 mass% or less of Al, 0.50 mass% or less of Al, 1.80 mass% or less of W, 0.30 mass% or less of V, 0.30 mass% or less of Ti, 2.5 mass% or less of Ni, 2.50 mass% or less of Mo, : 0.50 mass% or less, Zr: 0.20 mass% or less, B: 0.0050 mass% or less, rare earth element: 0.100 mass% or less, and Ca: 0.0050 mass% Ferritic stainless steel cold rolled steel sheets. 제 6 항 또는 제 7 항에 있어서,
배기관 부품의 제조에 이용되는 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 냉연 강판.8. The method according to claim 6 or 7,
A ferritic stainless steel cold-rolled steel sheet containing Nb, which is used for manufacturing an exhaust pipe component. 제 1 항 또는 제 2 항에 기재된 Nb함유 페라이트계 스테인리스 열연 강판을 소둔한 후, 70%이상의 압하율에서 냉연하고 소둔하는 것을 특징으로 하는 Nb함유 페라이트계 스테인리스 냉연 강판의 제조 방법.

A method for producing an Nb-containing ferritic stainless steel cold-rolled steel sheet, comprising annealing a Nb-containing ferritic stainless steel hot-rolled steel sheet according to any one of claims 1 to 3, and then cold rolling and annealing at a reduction ratio of 70% or more.

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