KR100415722B1 - a method of manufacturing austenite stainless steel with high strength - Google Patents
a method of manufacturing austenite stainless steel with high strength Download PDFInfo
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- KR100415722B1 KR100415722B1 KR10-1999-0060650A KR19990060650A KR100415722B1 KR 100415722 B1 KR100415722 B1 KR 100415722B1 KR 19990060650 A KR19990060650 A KR 19990060650A KR 100415722 B1 KR100415722 B1 KR 100415722B1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 229910001220 stainless steel Inorganic materials 0.000 title claims description 10
- 239000010935 stainless steel Substances 0.000 title claims description 5
- 229910001566 austenite Inorganic materials 0.000 title 1
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 238000005098 hot rolling Methods 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 238000001953 recrystallisation Methods 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- 238000005275 alloying Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
본 발명은 고강도를 갖는 오스테나이트계 스테인레스강에 관한 것이며 그 목적은 제어 압연 시의 미재결정역에서의 압연량과 합금성분이 항복강도에 미치는 영향을 검토하여, 미재결정역에서의 압연량과 합금성분의 조합을 조절하여 목표로 하는 항복강도를 갖는 오스테나이트계 스테인레스강을 제조하는 방법을 제공함에 있다.The present invention relates to austenitic stainless steel having high strength, and its purpose is to examine the effect of rolling amount and alloying component on yield strength in unrecrystallized zone during controlled rolling, It is to provide a method for producing austenitic stainless steel having a target yield strength by adjusting the combination of the components.
이와 같은 목적을 갖는 본 발명은 중량%로, C: 0.08% 이하, Mn: 2.0% 이하, Si :1.0% 이하, Cr: 16~20%, Ni: 7~13%, N: 0.01~0.15%, 나머지 Fe 및 불순물로 조성되는 슬라브를 열간압연하여 열연 강재를 제조하는 방법에 있어서 다음의 식으로 정의되는 항복강도를 확보하기 위하여 합금 성분과 미재결정역에서의 압연량을 조절하는 것을 그 기술적 요지로 한다.The present invention having such a purpose is, by weight, C: 0.08% or less, Mn: 2.0% or less, Si: 1.0% or less, Cr: 16-20%, Ni: 7-13%, N: 0.01-0.15% In the method of manufacturing hot rolled steel by hot rolling the slab composed of the remaining Fe and impurities, controlling the rolling amount in the alloy component and the non-recrystallized zone to secure the yield strength defined by the following equation. Shall be.
Y.S. (MPa) = 250 + 6 ×R + (1260 + 12 × R) × (%C + %N)Y.S. (MPa) = 250 + 6 × R + (1260 + 12 × R) × (% C +% N)
R : 미재결정역에서의 압연율(%)R: Rolling rate in unrecrystallized area (%)
Description
본 발명은 고강도 오스테나이트계 스테인레스강 제조방법에 관한 것으로서, 특히 항복강도와 미재결정영역에서의 압연량의 직선관계를 이용하여 충분한 항복강도를 확보할 수 있는 고강도 오스테나이트계 스테인레스강 제조방법에 관한 것이다.The present invention relates to a method for manufacturing high strength austenitic stainless steel, and more particularly, to a method for manufacturing high strength austenitic stainless steel that can secure sufficient yield strength by using a linear relationship between yield strength and rolling amount in unrecrystallized region. will be.
일반적으로 오스테나이트계 스테인레스강은 우수한 내식성을 갖고 있으며 용접 특성이 우수해 많은 용도에 사용되고 있으나 상대적으로 강도가 낮아 구조용으로 사용시 두께가 두꺼워지는 단점이 있다. 오스테나이트계 스테인레스강을 고강도화하면 사용 재료의 두께를 줄일 수 있어 이에 따른 경량화는 많은 경제적인 효과를 가져온다. 현재 상용화된 오스테나이트계 스테인레스강의 고강도화에는 상온에서의 냉간가공에 의한 가공경화 및 준안정 오스테나이트계에서의 냉간가공 시 생성되는 가공 유기 마르텐사이트 변태에 의한 강화, 결정립의 미세화에 의한 강화, 열간압연 시 재결정이 일어나지 않는 온도 구간에서 열간압연하여 변형 조직을 상온까지 유지시켜 강화하는 방법 등이 알려져 있다.In general, austenitic stainless steels have excellent corrosion resistance and excellent welding properties, which are used in many applications. However, the austenitic stainless steel has a disadvantage in that its thickness is thick when used for structural purposes because of its relatively low strength. Higher strength of austenitic stainless steels can reduce the thickness of the materials used, resulting in a number of economic effects. Strengthening of the currently commercially available austenitic stainless steels involves hardening by cold working at room temperature and by processing organic martensite transformation produced during cold working in metastable austenitic, by refining grains, and hot rolling. It is known to strengthen and maintain the deformed structure to room temperature by hot rolling in a temperature section where time recrystallization does not occur.
본 발명에서는 특히 열간압연 시 재결정이 일어나지 않는 온도 구간에서 열간압연하여 변형 조직을 상온까지 유지시켜 강화하는 방법에 있어 항복강도에 미치는 합금 성분과 압연량의 영향을 조사하여 합금 성분과 미재결정역에서의 압연량을 조절함으로써 고강도를 갖는 오스테나이트계 스테인레스강을 제조할 수 있도록 하는 데 그 목적이 있다.In the present invention, especially in the method of hot rolling in a temperature range where recrystallization does not occur during hot rolling to maintain the deformed structure to room temperature, the effect of the alloy component and the rolling amount on the yield strength is investigated in the alloy component and the non-recrystallized zone. The purpose is to enable the production of austenitic stainless steel having high strength by adjusting the rolling amount of the steel.
본 발명은 상기 목적을 달성하기 위하여, 중량 %로, C: 0.08% 이하, Mn: 2.0% 이하, Si :1.0% 이하, Cr: 16~20%, Ni: 7~13%, N: 0.01~0.15%, 나머지 Fe 및 불순물로 조성되고, 항복강도와 미재결정역에서의 압연량의 관계를 나타내는 하기 식을 만족하는 스테인레스강 슬라브를 열간압연하여 고강도를 갖는 오스테나이트계 스테인레스강의 제조 방법을 제공하는 것을 특징으로 한다.In order to achieve the above object, the present invention provides a weight%, C: 0.08% or less, Mn: 2.0% or less, Si: 1.0% or less, Cr: 16-20%, Ni: 7-13%, and N: 0.01- A method for producing austenitic stainless steel having high strength by hot rolling a stainless steel slab which is composed of 0.15%, the remaining Fe and impurities, and satisfies the following formula showing the relationship between the yield strength and the rolling amount in the uncrystallized region It is characterized by.
Y.S.(MPa) = 250 + 6 × R + (1260 + 12 ×R) × (%C + %N)Y.S. (MPa) = 250 + 6 × R + (1260 + 12 × R) × (% C +% N)
R : 미재결정역에서의 압연율(%)R: Rolling rate in unrecrystallized area (%)
도 1은 합금 성분과 미재결정역에서의 압연량의 항복강도와의 관계를 나타내는 그래프.BRIEF DESCRIPTION OF THE DRAWINGS The graph which shows the relationship between the yield strength of the amount of rolling in an alloy component and a non-recrystallization zone.
이하 본 발명을 도면을 참조로 하여 상세히 설명하기로 한다.Hereinafter, the present invention will be described in detail with reference to the drawings.
본 발명은, 중량 %로 C: 0.08% 이하, Mn: 2.0% 이하, Si :1.0% 이하, Cr: 16~20%, Ni: 7~13%, N: 0.01~0.15%로 구성되고 나머지 Fe 및 불순물로 조성되는 스테인레스강에서 다음의 식으로 정의되는 항복강도를 확보하는 합금 성분의 설계를 특징으로 한다.The present invention is composed of the weight% C: 0.08% or less, Mn: 2.0% or less, Si: 1.0% or less, Cr: 16-20%, Ni: 7-13%, N: 0.01-0.15% and the remaining Fe And a design of an alloy component which secures the yield strength defined by the following equation in stainless steel composed of impurities.
Y.S. (MPa) = 250 + 6 ×R + (1260 + 12 × R) × (%C + %N)Y.S. (MPa) = 250 + 6 × R + (1260 + 12 × R) × (% C +% N)
R : 압연율(%)R: rolling rate (%)
먼저 본 발명의 대상 강종은 통상의 오스테나이트계 스테인레스강으로서, 구체적으로 현재 상용되고 있는 C : 0.08중량%( 이하, 단지 '%'라 함)이하, Mn : 2.0% 이하, Si : 1.0% 이하, Cr : 16~20%, Ni : 7~13%, N: 0.01~0.15%로 구성되고, 나머지 Fe 및 불순물로 조성되는 스테인레스강이다.First, the subject steel grade of the present invention is a conventional austenitic stainless steel, specifically C: 0.08% by weight (hereinafter referred to as '%') or less, Mn: 2.0% or less, Si: 1.0% or less , Cr: 16 ~ 20%, Ni: 7 ~ 13%, N: 0.01 ~ 0.15%, stainless steel composed of the remaining Fe and impurities.
본 발명은 상기와 같이 조성되는 슬라브를 열간압연함에 있어서 재결정이 일어나지 않는 온도 구간인 900~950℃ 이하에서의 압연량과 합금성분의 함량과 항복강도 사이에 다음의 관계식 1과 같은 관계가 있음을 알아냈다.In the present invention, there is a relationship between the rolling amount and the alloying content and the yield strength in the temperature range of 900 to 950 ° C. or lower, which is not a recrystallization, during hot rolling of the slab formed as described above. Figured out.
(관계식 1)(Relationship 1)
Y.S. (MPa) = 250 + 6 ×R + (1260 + 12 × R) × (%C + %N)Y.S. (MPa) = 250 + 6 × R + (1260 + 12 × R) × (% C +% N)
R : 미재결정역에서의 압연율(%)R: Rolling rate in unrecrystallized area (%)
따라서, 목표로 하는 항복강도를 얻기 위해서는 관계식 1로 계산한 탄소와 질소 함량 및 압연율의 조합으로 성분 설계 및 압연 조업을 실시하면 용이하게 목표로 하는 항복강도를 갖는 제품을 생산할 수 있게 되는 것이다.Therefore, in order to obtain a target yield strength, the component design and rolling operation can be easily produced with a combination of carbon and nitrogen content and a rolling rate calculated by relational formula 1, thereby producing a product having a target yield strength.
이하 본 발명을 실시예를 통하여 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
(실시예)(Example)
하기 표 1과 같이 조성되는 오스테나이트계 스테인레스강(STS 304, 304L, 304N1) 및 Ti 첨가 오스테나이트계 스테인레스강(STS321) 슬라브를 통산의 조건으로 열간압연후 완전 재결정이 일어나는 온도 구간(970~1030℃)에 해당하는 1000℃에서 30분간 유지하여 완전 재결정시킨 후 미재결정 영역(900~950℃)에 해당하는 900℃에서 각각 10%와 20%씩 열간압연한 후 측정한 항복강도를 도 1에 나타냈다. 도 1로부터 항복강도와 (C+N)의 함량 및 미재결정역에서의 압연량으로 회기 분석한 결과, 하기 실험식이 도출되었다.Temperature range in which complete recrystallization occurs after hot rolling of the austenitic stainless steels (STS 304, 304L, 304N1) and Ti-added austenitic stainless steels (STS321) slab, which are formed as shown in Table 1 below. The yield strength measured after hot-rolling by 10% and 20% respectively at 900 ℃ corresponding to the unrecrystallized region (900 ~ 950 ℃) after maintaining completely recrystallization at 1000 ℃ corresponding to 30 ℃) Indicated. From the analysis of the yield strength, the content of (C + N) and the amount of rolling in the uncrystallized region from Figure 1, the following experimental formula was derived.
Y.S. (MPa) = 250 + 6 ×R + (1260 + 12 × R) × (%C + %N)Y.S. (MPa) = 250 + 6 × R + (1260 + 12 × R) × (% C +% N)
R : 미재결정역에서의 압연율(%)R: Rolling rate in unrecrystallized area (%)
또한, STS 304 슬라브를 상업적인 생산 설비에서 열간압연함에 있어 완전 재결정이 일어나는 온도 구간에서 열간압연한 후, 미재결정 영역 이하로 온도를 낮추어 압연한 경우에도 위의 관계식은 실제의 항복강도와 5% 이내의 범위에서 일치하였다.In addition, even if the STS 304 slab is hot rolled in a temperature range where complete recrystallization occurs in hot rolling in a commercial production facility, and then the temperature is rolled to below the unrecrystallized area, the above relation is within 5% of the actual yield strength. Corresponded in the range of.
상술한 바와 같이, 본 발명에 의하면, 성분 설계 및 압연량의 조합을 조절하여 목표로 하는 항복강도의 오스테나이트계 스테인레스강을 제조할 수 있는 효과가 있다.As described above, according to the present invention, an austenitic stainless steel having a target yield strength can be produced by adjusting a combination of component design and rolling amount.
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| KR10-1999-0060650A KR100415722B1 (en) | 1999-12-22 | 1999-12-22 | a method of manufacturing austenite stainless steel with high strength |
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| KR10-1999-0060650A KR100415722B1 (en) | 1999-12-22 | 1999-12-22 | a method of manufacturing austenite stainless steel with high strength |
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| KR100415722B1 true KR100415722B1 (en) | 2004-01-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101056235B1 (en) * | 2008-11-25 | 2011-08-11 | 주식회사 포스코 | Prediction of Material Properties of Austenitic Stainless Steel Cold Rolled Products |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62199214A (en) * | 1986-02-28 | 1987-09-02 | Nisshin Steel Co Ltd | Cold rolling method for metastable austenitic group stainless steel |
| JPS63186822A (en) * | 1987-01-29 | 1988-08-02 | Nkk Corp | Manufacturing method of high-strength austenitic stainless steel |
-
1999
- 1999-12-22 KR KR10-1999-0060650A patent/KR100415722B1/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62199214A (en) * | 1986-02-28 | 1987-09-02 | Nisshin Steel Co Ltd | Cold rolling method for metastable austenitic group stainless steel |
| JPS63186822A (en) * | 1987-01-29 | 1988-08-02 | Nkk Corp | Manufacturing method of high-strength austenitic stainless steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101056235B1 (en) * | 2008-11-25 | 2011-08-11 | 주식회사 포스코 | Prediction of Material Properties of Austenitic Stainless Steel Cold Rolled Products |
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| KR20010063537A (en) | 2001-07-09 |
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