WO1995002074A1 - Acier tres resistant a la corrosion et acier tres resistant a la corrosion et tres apte au façonnage - Google Patents
Acier tres resistant a la corrosion et acier tres resistant a la corrosion et tres apte au façonnage Download PDFInfo
- Publication number
- WO1995002074A1 WO1995002074A1 PCT/JP1994/001096 JP9401096W WO9502074A1 WO 1995002074 A1 WO1995002074 A1 WO 1995002074A1 JP 9401096 W JP9401096 W JP 9401096W WO 9502074 A1 WO9502074 A1 WO 9502074A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel
- corrosion resistance
- less
- workability
- high corrosion
- Prior art date
Links
Classifications
-
- 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
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Definitions
- the present invention relates to steel having excellent corrosion resistance and steel having excellent corrosion resistance and workability, in particular, steel having excellent corrosion resistance in an exhaust system of an internal combustion engine such as an automobile or a ship, and a component having the same corrosion resistance. Steel with excellent workability required for machining.
- the exhaust system of internal combustion engines has been made of ordinary steel that has been subjected to aluminum or zinc to suppress corrosion from the inside or outside. Since a catalyst or the like is provided in the exhaust system for the purpose of purifying the exhaust gas in order to suppress environmental pollution, such corrosion-resistant steel materials have become insufficient in corrosion resistance.
- steel containing 3 to 12% Cr is disclosed in JP-A-63-143240, JP-A-63-143241, JP-A-2-156048, and the like. It is disclosed for the purpose of improving corrosion resistance in exhaust gas system equipment.
- high-grade stainless steel containing Cr up to about 18% or further adding Mo is widely used in exhaust systems.
- high-grade stainless steel does not always have sufficient corrosion resistance, such as the occurrence of pitting-like local corrosion.
- high-grade stainless steel contains a large amount of Cr and Mo and thus has poor workability, and in order to form a complicated shape such as an exhaust system member, it is extremely difficult to manufacture, and the manufacturing process is difficult.
- the difficulty is that the process cost is high because the process becomes extremely complicated. You. Furthermore, it may not be applicable depending on the shape, and the material cost is also high.
- the present invention has high corrosion resistance to a corrosive environment such as an exhaust system of an internal combustion engine and low cost steel, or has high corrosion resistance to a corrosive environment such as the exhaust system of an internal combustion engine and simultaneously processes the steel. It has been achieved for the purpose of providing steel with excellent properties and low cost.
- the present inventors have studied various aspects of steel having excellent corrosion resistance in a corrosive environment such as an exhaust system in order to solve the above problems.
- the present inventors examined the corrosion environment of the exhaust system, and found that corrosion of the exhaust system of an internal combustion engine occurs in an environment in which chlorides, sulfate, etc. contained in exhaust gas are heated to 80 to 150 ° C. I found it.
- Cr was reduced to 2.5 to 9.9% and A1 was more than 3.0, completely contrary to conventional stainless steel. It has been found that steel with a content of up to 8.0% exhibits extremely excellent corrosion resistance in corrosive environments such as exhaust systems.
- the present inventors continued their investigation to produce a better steel.
- C and N are reduced and Nb, V, Ti, Zr, Ta, and Hf are added to satisfy the specific conditions in the above steels, the corrosion resistance and the workability are improved.
- superior corrosion resistance can be obtained by adding Cu, Mo, Sb, Ni, W and REM, Ca alone or in combination to the above steels, and deoxidation and strengthening elements such as Si and We found that Mn was appropriate.
- the present invention has been mainly made based on the above findings, and the gist of the first invention of the present invention is as follows:
- Si 0.01% or more and less than 1.2%
- N is 0.02% or less
- the gist of the second invention is that the steel of the first invention is added as an additional component by
- the gist of the third invention is that the steel of the first invention or the second invention is further added as an additional component by weight%.
- Rare earth element 0.001 to 0.1%
- Ca 0.0005 to 0.03%
- Si 0.01% or more and less than 1.2%
- N is 0.02% or less
- the gist of the fifth invention is that the steel of the fourth invention is added as an additional component in weight%.
- the gist of the sixth invention is that, as an additional component to the steel of the fourth invention or the fifth invention,
- Rare earth element 0.001 to 0.1%
- Ca 0.0005 to 0.03%
- An object of the present invention is to provide a steel member having corrosion resistance, corrosion resistance, and workability that can sufficiently cope with use conditions under the recent severe corrosive environment in the above-mentioned automobile exhaust gas system.
- Si is effective when added as a deoxidizing agent and as a strengthening element to steel containing 2.5% or more of Cr.
- the content is less than 0.01%, the deoxidizing effect is not sufficient, and if the content is 1.2% or more, the effect is no longer saturated and the processability is reduced, so the content range is 0.01% or more and 1.2% Limited to less than.
- Mn should be contained 0.1% or more is necessary as a deoxidizer of steel (but working its effect when the content exceeds 2.0% or longer Rubakari not saturate, and causes excessive Mn is contained Therefore, the upper limit content is set to 1.5%.
- A1 is an important element in addition to Cr in order to secure corrosion resistance in the present invention. As described above, when the content of A1 is 3.0% or less, the effect of suppressing the occurrence of pitting corrosion is not sufficient. On the other hand, if the content exceeds 8.0%, the effect is saturated, but the workability is reduced. Therefore, the content of A1 is limited to more than 3.0 and 8.0% or less.
- C, N
- C and N decrease the workability of the steel sheet, while C forms carbides with Cr and lowers the corrosion resistance. Further, since N lowers the toughness, it is desirable that the amounts of C and N are small, and the upper limit contents are both 0.02%, and the smaller the amount of both, the more preferable.
- the upper limit content is set to 0.03%.
- the pitting corrosion resistance is reduced, so a smaller amount is desirable, and the upper limit content is set to 0.01%.
- Nb, V. Ti, Zr, Ta, and Hf Nb, V, Ti, Zr, Ta, and Hf improve corrosion resistance and additivity by fixing C and N in high Cr steels as carbides. Has a remarkable effect on the improvement of Each element can be added alone or two or more elements can be added in combination. However, there is no effect if the total amount of the single additive or the combined additive is less than 0.01%, and if it exceeds 0.5%, the cost will be increased unnecessarily and it may cause rolling flaws etc. Therefore, the upper limit content is 0.5%. In addition, in order to improve workability effectively, the total amount of Nb, V, Ti, Zr, Ta, and Hf must satisfy the following equation.
- the above are the basic components of the steel excellent in corrosion resistance or the steel excellent in corrosion resistance and workability targeted by the present invention.
- the present invention is also directed to a steel whose properties are further improved by adding the following elements as needed.
- Cu has the effect of improving the resistance to general corrosion when 0.05% or more is added to steel containing 2.5% or more of Cr and more than 3.0% of A1. However, even if added in excess of 3.0%, the effect will be saturated and the power and hot workability will be reduced, so the upper limit content is set to 3.0%.
- Mo has the effect of suppressing the generation and growth of pitting corrosion by adding 0.05% or more to steel containing 2.5% or more of Cr and more than 3.0% of A1. If the addition exceeds 1.5%, not only does the effect become saturated, but also the workability decreases, so the upper limit content is set to 1.5%.
- Sb also has the effect of improving resistance to pitting and general corrosion when added to steel containing 2.5% or more of Cr and more than 3.0% of A1 and 0.01% or more of A1. However, if added in excess of 0.5%, the hot workability is reduced, so the upper limit content is set to 0.5%.
- Ni has the effect of suppressing pitting corrosion by adding 0.01% or more to steel containing 2.5% or more of Cr and more than 3.0% of A1. However, adding more than 2.0% not only saturates the effect but also reduces the hot workability, so the upper limit content is set to 2.0%.
- W is added to steel containing 2.5% or more of Cr and more than 3.0% of i.
- the effect of suppressing the generation and growth of corrosion is remarkable.
- adding more than 3.0% not only saturates the effect but also lowers workability, so the upper limit content is set to 3.0%.
- Rare earth elements and Ca are effective in improving hot workability and pitting corrosion resistance Element. If the amount of these elements is less than 0.001% for rare earth elements and less than 0.0005% for Ca, the effect is not sufficient. However, if the addition of rare earth elements exceeds 0.1% and that of Ca exceeds 0.03%, coarse nonmetallic inclusions are formed, respectively, and conversely degrade hot workability and pitting corrosion resistance. . Therefore, the upper limit content was set to 0.1% for rare earth elements and 0.03% for Ca.
- the rare earth element means an element having an atomic number of 57 to 71 (lanthanide) or 89 to 103 (actinide) and an element of 39 (Y).
- the steel of the present invention When the steel of the present invention is used for an exhaust system of an internal combustion engine, it is first manufactured as a steel plate, then formed into a predetermined shape by a press or the like, further processed and welded, and manufactured as a product. May be. Further, the steel sheet may be formed into a steel pipe shape, for example, as an electric resistance welded steel pipe or the like, and then used in a product by secondary processing, welding, or the like. Any steel having a combination of composition and elements defined in the present invention, including other processes, is an object of the present invention. Furthermore, it is also possible to select the most suitable product manufacturing process based on cost, restrictions on existing manufacturing facilities, etc., and no matter which manufacturing process is selected, it does not depart from the scope of the present invention. .
- the steel of the present invention is applicable not only to an exhaust system of an internal combustion engine, but also to various corrosive environments such as an environment in which an aqueous solution containing chlorides, sulfate ions, or the like is exposed to high temperatures, or an environment in which heating and cooling are repeated.
- the steels shown in Tables 1 to 9 are melted and made into a 1 mm thick steel sheet by ordinary steel sheet manufacturing processes such as hot rolling and cold rolling, and then annealed at 850 ° C. Was.
- test pieces with a width of 50 mm and a length of 70 ⁇ were collected from these steel sheets and subjected to a corrosion test.
- Corrosion test the ion 1 00 p pm sulfate, soaked until chloride ions 1 00 p pm, the specimen bicarbonate Ion 500 p pm in aqueous solution 50 cm 3 was added in the form of Anmoniumu salts half test vessel Each test was repeated 20 times in which the test solution was completely evaporated and volatilized while being kept at 130 ° C. This simulates the corrosion conditions of an automobile exhaust system.
- X value in the table indicates the value calculated by the following formula
- the present invention has made it possible to provide steel having excellent corrosion resistance in an exhaust system of an internal combustion engine such as an automobile or steel having excellent corrosion resistance and workability at a low cost. It is extremely large and contributes to the development of industry.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950700693A KR0157727B1 (ko) | 1993-07-06 | 1994-07-06 | 내식성이 우수한 강 및 내식성과 가공성이 우수한 강 |
EP94919855A EP0658632A4 (en) | 1993-07-06 | 1994-07-06 | STEEL WITH HIGH CORROSION RESISTANCE AND STEEL WITH HIGH CORROSION RESISTANCE AND WORKABILITY. |
AU70839/94A AU668315B2 (en) | 1993-07-06 | 1994-07-06 | Steel of high corrosion resistance and steel of high corcorrosion resistance and workability |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16720793 | 1993-07-06 | ||
JP16720693 | 1993-07-06 | ||
JP5/167207 | 1993-07-06 | ||
JP5/167206 | 1993-07-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995002074A1 true WO1995002074A1 (fr) | 1995-01-19 |
Family
ID=26491320
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1994/001096 WO1995002074A1 (fr) | 1993-07-06 | 1994-07-06 | Acier tres resistant a la corrosion et acier tres resistant a la corrosion et tres apte au façonnage |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0658632A4 (ja) |
KR (1) | KR0157727B1 (ja) |
AU (1) | AU668315B2 (ja) |
CA (1) | CA2143434A1 (ja) |
WO (1) | WO1995002074A1 (ja) |
Cited By (2)
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---|---|---|---|---|
JP2007163307A (ja) * | 2005-12-14 | 2007-06-28 | Denso Corp | ガスセンサ |
JP2022543573A (ja) * | 2019-07-31 | 2022-10-13 | ポスコ | 耐食性に優れた排気系用フェライト系鋼板 |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU674374B2 (en) * | 1992-12-11 | 1996-12-19 | Nippon Steel Corporation | Steel of high corrosion resistance and high processability |
DE19820806B4 (de) * | 1998-05-09 | 2004-03-04 | Max-Planck-Institut Für Eisenforschung GmbH | Verwendungen eines Leichtbaustahls |
DK1627931T3 (en) * | 2003-04-25 | 2018-11-05 | Tubos De Acero De Mexico S A | Seamless steel tube which is intended to be used as a guide pipe and production method thereof |
MXPA05008339A (es) | 2005-08-04 | 2007-02-05 | Tenaris Connections Ag | Acero de alta resistencia para tubos de acero soldables y sin costura. |
CN101506392B (zh) | 2006-06-29 | 2011-01-26 | 特纳瑞斯连接股份公司 | 用于液压缸的在低温下具有增强各向同性刚度的无缝精密钢管及其制造工序 |
US7862667B2 (en) | 2007-07-06 | 2011-01-04 | Tenaris Connections Limited | Steels for sour service environments |
US8328960B2 (en) | 2007-11-19 | 2012-12-11 | Tenaris Connections Limited | High strength bainitic steel for OCTG applications |
US8221562B2 (en) | 2008-11-25 | 2012-07-17 | Maverick Tube, Llc | Compact strip or thin slab processing of boron/titanium steels |
EP2325435B2 (en) | 2009-11-24 | 2020-09-30 | Tenaris Connections B.V. | Threaded joint sealed to [ultra high] internal and external pressures |
US9163296B2 (en) | 2011-01-25 | 2015-10-20 | Tenaris Coiled Tubes, Llc | Coiled tube with varying mechanical properties for superior performance and methods to produce the same by a continuous heat treatment |
IT1403689B1 (it) | 2011-02-07 | 2013-10-31 | Dalmine Spa | Tubi in acciaio ad alta resistenza con eccellente durezza a bassa temperatura e resistenza alla corrosione sotto tensioni da solfuri. |
IT1403688B1 (it) | 2011-02-07 | 2013-10-31 | Dalmine Spa | Tubi in acciaio con pareti spesse con eccellente durezza a bassa temperatura e resistenza alla corrosione sotto tensione da solfuri. |
US8636856B2 (en) | 2011-02-18 | 2014-01-28 | Siderca S.A.I.C. | High strength steel having good toughness |
US8414715B2 (en) | 2011-02-18 | 2013-04-09 | Siderca S.A.I.C. | Method of making ultra high strength steel having good toughness |
US9340847B2 (en) | 2012-04-10 | 2016-05-17 | Tenaris Connections Limited | Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same |
WO2013178629A1 (de) * | 2012-05-29 | 2013-12-05 | Thyssenkrupp Steel Europe Ag | Warmfester fe-al-cr-stahl |
BR112015016765A2 (pt) | 2013-01-11 | 2017-07-11 | Tenaris Connections Ltd | conexão de tubos de perfuração, tubo de perfuração correspondente e método para montar tubos de perfuração |
US9187811B2 (en) | 2013-03-11 | 2015-11-17 | Tenaris Connections Limited | Low-carbon chromium steel having reduced vanadium and high corrosion resistance, and methods of manufacturing |
US9803256B2 (en) | 2013-03-14 | 2017-10-31 | Tenaris Coiled Tubes, Llc | High performance material for coiled tubing applications and the method of producing the same |
EP2789700A1 (en) | 2013-04-08 | 2014-10-15 | DALMINE S.p.A. | Heavy wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes |
EP2789701A1 (en) | 2013-04-08 | 2014-10-15 | DALMINE S.p.A. | High strength medium wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes |
CN113278890A (zh) | 2013-06-25 | 2021-08-20 | 特纳瑞斯连接有限公司 | 高铬耐热钢 |
US11124852B2 (en) | 2016-08-12 | 2021-09-21 | Tenaris Coiled Tubes, Llc | Method and system for manufacturing coiled tubing |
US10434554B2 (en) | 2017-01-17 | 2019-10-08 | Forum Us, Inc. | Method of manufacturing a coiled tubing string |
KR20200065990A (ko) * | 2018-11-30 | 2020-06-09 | 주식회사 포스코 | 황산 및 황산/염산 복합 응축 환경에서 내식성을 갖는 강판 및 그 제조방법 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5331812B2 (ja) * | 1972-03-15 | 1978-09-05 | ||
JPS558579B2 (ja) * | 1973-06-25 | 1980-03-05 | ||
JPH03166337A (ja) * | 1989-11-24 | 1991-07-18 | Nippon Steel Corp | 自動車排ガス触媒担体用ステンレス鋼箔 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3594156A (en) * | 1969-05-29 | 1971-07-20 | United States Steel Corp | Stainless steel |
US3690870A (en) * | 1970-08-26 | 1972-09-12 | United States Steel Corp | Stainless steel |
US3698964A (en) * | 1970-11-04 | 1972-10-17 | Olin Corp | Oxidation-resistant articles of an iron base alloy containing chromium and aluminum and/or silicon |
US3909250A (en) * | 1973-06-25 | 1975-09-30 | Armco Steel Corp | Oxidation-resistant ferrous alloy |
US4316743A (en) * | 1973-10-29 | 1982-02-23 | Tokyo Shibaura Electric Co., Ltd. | High damping Fe-Cr-Al alloy |
EP0443179B1 (en) * | 1989-12-25 | 1995-05-17 | Kawasaki Steel Corporation | Oxidation resistant steel, containing chromium and aluminium |
-
1994
- 1994-07-06 WO PCT/JP1994/001096 patent/WO1995002074A1/ja not_active Application Discontinuation
- 1994-07-06 KR KR1019950700693A patent/KR0157727B1/ko not_active IP Right Cessation
- 1994-07-06 AU AU70839/94A patent/AU668315B2/en not_active Ceased
- 1994-07-06 EP EP94919855A patent/EP0658632A4/en not_active Ceased
- 1994-07-06 CA CA002143434A patent/CA2143434A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5331812B2 (ja) * | 1972-03-15 | 1978-09-05 | ||
JPS558579B2 (ja) * | 1973-06-25 | 1980-03-05 | ||
JPH03166337A (ja) * | 1989-11-24 | 1991-07-18 | Nippon Steel Corp | 自動車排ガス触媒担体用ステンレス鋼箔 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0658632A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007163307A (ja) * | 2005-12-14 | 2007-06-28 | Denso Corp | ガスセンサ |
JP2022543573A (ja) * | 2019-07-31 | 2022-10-13 | ポスコ | 耐食性に優れた排気系用フェライト系鋼板 |
Also Published As
Publication number | Publication date |
---|---|
CA2143434A1 (en) | 1995-01-07 |
EP0658632A4 (en) | 1995-11-29 |
AU668315B2 (en) | 1996-04-26 |
KR0157727B1 (ko) | 1998-11-16 |
KR950703069A (ko) | 1995-08-23 |
EP0658632A1 (en) | 1995-06-21 |
AU7083994A (en) | 1995-02-06 |
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