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WO2011027847A1 - Acier inoxydable à faible teneur en ni ayant une excellente résistance à la corrosion - Google Patents

Acier inoxydable à faible teneur en ni ayant une excellente résistance à la corrosion Download PDF

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Publication number
WO2011027847A1
WO2011027847A1 PCT/JP2010/065091 JP2010065091W WO2011027847A1 WO 2011027847 A1 WO2011027847 A1 WO 2011027847A1 JP 2010065091 W JP2010065091 W JP 2010065091W WO 2011027847 A1 WO2011027847 A1 WO 2011027847A1
Authority
WO
WIPO (PCT)
Prior art keywords
corrosion resistance
stainless steel
less
steel
concentration
Prior art date
Application number
PCT/JP2010/065091
Other languages
English (en)
Japanese (ja)
Inventor
道郎 金子
正治 秦野
美茶 崎谷
Original Assignee
新日鐵住金ステンレス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 新日鐵住金ステンレス株式会社 filed Critical 新日鐵住金ステンレス株式会社
Priority to JP2011529948A priority Critical patent/JP5528459B2/ja
Priority to CN201080035815.3A priority patent/CN102471855B/zh
Publication of WO2011027847A1 publication Critical patent/WO2011027847A1/fr

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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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Definitions

  • the present invention relates to stainless steel used for automobiles, home appliances, kitchens, buildings, etc., and particularly relates to stainless steel that is inexpensive and excellent in cold workability and corrosion resistance.
  • Austenitic stainless steel is represented by SUS304 steel, and is the steel type used for a wide range of applications among stainless steels.
  • SUS304 steel contains Ni, it has a disadvantage of being expensive.
  • ferritic stainless steel as a stainless steel that does not contain Ni or contains a small amount, but it has a drawback that it is generally inferior in cold workability as compared with austenitic stainless steel such as SUS304 steel. Therefore, attempts have been made to replace Ni with an inexpensive alloy element in austenitic stainless steel.
  • Steel types in which Ni is partially replaced with Mn and N are standardized by JIS as SUS201 and 202.
  • Patent Document 1 discloses a high-strength non-containing material having a low Ni content and containing Si: 1% or less, Mn: 14-16%, Cr: 15-19%, and N: 0.3-0.4%. Magnetic stainless steel is disclosed.
  • Patent Document 2 includes Si: 1 to 5%, Mn: 16 to 25%, Cr: 5 to 12%, N: 0.1 to 0.3%, and high strength and high ductility not containing Ni. High Mn steel is shown. However, although these steel types have the advantage that high strength is easily obtained and become non-magnetic, there is a disadvantage that the corrosion resistance is inferior due to the addition of Mn.
  • JP 60-197853 A Japanese Patent Laid-Open No. 2-8351
  • the high-strength nonmagnetic austenitic stainless steel in which Ni, which is an expensive alloy additive element, is substituted with Mn has a problem that the corrosion resistance is reduced due to Mn substitution.
  • An object of the present invention is to provide a stainless steel having excellent corrosion resistance even when Ni is replaced with Mn.
  • the inventors diligently studied stainless steel that can ensure corrosion resistance even when Ni is replaced with Mn. As a result, it was found that the corrosion resistance can be ensured even when Ni is replaced with Mn by adding a predetermined amount of one or both of La and Ce while reducing the S concentration in the stainless steel. Further, it has been found that the corrosion resistance is remarkably improved when the total concentration of La and Ce and the S concentration have a predetermined relationship. Furthermore, in the stainless steel which substituted Ni with Mn, it also discovered that addition of excess Si reduced corrosion resistance.
  • the present invention has been made based on the above findings, and the gist thereof is as follows.
  • stainless steel having excellent corrosion resistance can be obtained even when Ni in stainless steel is replaced with Mn and the amount of expensive Ni added is reduced.
  • the stainless steel of the present invention is particularly effective for applications such as automobiles, home appliances, kitchens, and construction because the amount of Ni added is small.
  • % display of the content of each element means “mass%”.
  • C 0.1% or less, C precipitates as Cr carbide at the grain boundary during the cooling process after the solution heat treatment, thereby forming a chromium-deficient layer and lowering the corrosion resistance. Moreover, C addition becomes a solid solution strengthening and reduces cold workability. For this reason, the upper limit is made 0.1%. A preferable upper limit is 0.06%. In order to stabilize the austenite structure, 0.04% or more is preferably added.
  • Si 1.0% or less
  • Si is an element that serves as a deoxidizer during dissolution, but when added in excess, it promotes the formation of a ⁇ ferrite phase at high temperatures and reduces hot workability.
  • the upper limit of Si is 1.0%.
  • a preferable upper limit of Si is 0.6%.
  • the lower limit of Si is preferably 0.1%.
  • P 0.045% or less Since P deteriorates corrosion resistance and hot workability, the upper limit is made 0.045%.
  • S 0.005% or less S forms inclusions and lowers corrosion resistance, so the upper limit is made 0.005%.
  • Cr 17-22% Cr is the most important element for the corrosion resistance of stainless steel, and at least 17% or more is necessary. However, if over 22% is added, hot workability is reduced due to the formation of ⁇ ferrite at high temperatures, so 22% is made the upper limit. A preferable upper limit of Cr is 20%. Further, the lower limit of Cr is preferably 18%. Mn: 4-12% Mn is an austenite-forming element that replaces Ni, and at least 4% or more must be added. However, excessive addition of Mn degrades the corrosion resistance, so the upper limit is 12%. In order to ensure the corrosion resistance in the acid rain air environment, it is more preferable to set it to 10% or less.
  • Ni 2-6% Since it is difficult to obtain an austenite structure with Mn alone, Ni that is an austenite-generating element is required to be at least 2%. It is also effective for improving corrosion resistance. However, excessive addition of Ni causes an increase in manufacturing cost, so the upper limit of Ni is 6%. Preferably it is 5.5% or less, More preferably, it is 5% or less. Ni is most preferably in the range of 2.5 to 4%.
  • Cu 0.5 to 3% Cu is an austenite-generating element and an element that improves acid resistance, and at least 0.5% or more must be added.
  • N 0.05 to 0.3% N is an austenite-forming element and an element effective for improving corrosion resistance, and at least 0.05% is necessary.
  • N causes a decrease in cold workability due to a significant increase in strength or causes blowholes during solidification, so the upper limit is made 0.3%.
  • a more preferable range of N is 0.07 to 0.15%.
  • La and Ce alone or both are added. These elements contribute to the control of the form and properties of oxides and sulfides, and are indispensable for improving the corrosion resistance of stainless steel in which Ni is replaced with Mn. At least 0.006% or more of each element must be added. There is. However, if these elements are added in excess of 0.2% in total, the cleanliness of the stainless steel is lowered, and coarse oxides of several ⁇ m or more of La and Ce are formed, which becomes the starting point of pitting corrosion. When the corrosion resistance is particularly important, such as sea salt particle scattering or acid rain environment, La and Ce are each preferably set to 0.10% or less.
  • B is an element that easily segregates at the grain boundary, and excessive addition lowers the corrosion resistance at the grain boundary, so 0.015% is made the upper limit.
  • the total concentration of La and Ce and the S concentration have a predetermined relationship after the S concentration is reduced as described above. The reason for this will be explained based on the results of the following studies.
  • the surface was ground 0.1 mm or more by wet emery paper polishing to prepare a test piece.
  • the test piece thus obtained was tested according to “Method for measuring pitting corrosion potential of stainless steel” of JIS G 0577.
  • the pitting potential at which the current density is 100 ⁇ A / cm 2 is 300 mV or more on the basis of the SCE (standard calomel electrode), and the extension of the total concentration range of La and Ce is S
  • the total concentration of La and Ce and the S concentration have a very strong correlation and can be expressed by a linear function of the S concentration.
  • the pitting corrosion potential was 300 mV or higher when the relationship of the following formula (1) was satisfied, and excellent corrosion resistance was exhibited. That is, when the total concentration of La and Ce is (A) mass% and the S concentration is (B) mass%, the steel components preferably satisfy the following formula (1). 0.005% + 25 (B)% ⁇ (A)% ⁇ 0.02% + 36 (B)% (1) This is presumed to be a result of the degree of poor water solubility of sulfides containing La and Ce alone or both being affected by the S concentration in the steel.
  • the lower limit of the above formula (1) is that the addition of La and Ce alone or in combination suppresses the precipitation of water-soluble MnS, and sufficiently produces sulfide containing single or both of poorly soluble La and Ce. And the total concentration of La and Ce necessary for suppressing pitting corrosion in the pitting corrosion potential test.
  • the upper limit of the above formula (1) is that when La and Ce are added singly or in combination, a complex oxide inclusion containing a coarse oxide of several ⁇ m or more including sulfide and oxide is generated. This is considered to correspond to the starting point of pitting corrosion. Therefore, better corrosion resistance can be obtained by adjusting the contents of the three components La, Ce, and S so as to satisfy the above formula (1).
  • the present invention will be further described in the examples.
  • the conditions in the examples are one example of conditions adopted to confirm the feasibility and effects of the present invention, and the present invention is limited to this one example of conditions. It is not something.
  • the present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
  • a steel ingot of 85 mm x 90 mm x 250 mm is prepared in a high-wave vacuum melting furnace, the surface is mechanically ground, then heated in an electric furnace at 1200 ° C for 60 minutes, and the plate thickness is 5 mm with a four-stage rolling mill Until hot rolled.
  • the obtained hot-rolled sheet was annealed at 1200 ° C.
  • Tables 1 and 2 show the components of the inventive examples and comparative examples, the degree of ear cracking during hot rolling, and the RN based on JISG0595. In Tables 1 and 2, component values that are outside the scope of the present invention are underlined. Comparative Examples 1 and 2 correspond to martensitic SUS430 steel and austenitic SUS304 steel, respectively, but the inventive examples all have RNs higher than Comparative Example 1 which is equivalent to martensitic SUS403 steel. It was confirmed that it was high and excellent in corrosion resistance.
  • Examples 1 to 3 and 5 to 28 of the present invention had corrosion resistance equivalent to or higher than that of Comparative Example 2 corresponding to austenitic SUS304 steel. That is, it was confirmed that Examples 1-3, 5-28 of the present invention had corrosion resistance equivalent to or higher than that of SUS304 steel without adding a large amount of Ni as in SUS304 steel.
  • Ni is close to the lower limit of the range of the present invention, and Si that causes a decrease in the corrosion resistance of the high Mn-saving Ni-type stainless steel is high within the range of the present invention.
  • RN of Invention Example 4 is 6, which is slightly inferior in corrosion resistance as compared with SUS304 steel, but considering that the addition amount of Ni is near the lower limit of the range of the present invention and is economical, it is practical. It has sufficient corrosion resistance. And among the inventive examples, in inventive examples 5, 6, 11, 12, 17, 23, and 26 that satisfy the above formula (1), RN was 8, and it was confirmed that the corrosion resistance was particularly excellent.
  • Tables 1 and 2 Examples 1 to 7 and 10 to 19 of the present invention in which the addition amount (content) of B is 0.0001% do not actively add B, and are inevitable impurity levels. Indicates that there is.
  • Comparative Example 12 B is outside the upper limit
  • Comparative Examples 13 to 15 the total concentration of La and Ce (total content) is outside the upper limit
  • Comparative Example 16 S is outside the upper limit.
  • the corrosion resistance was poor.
  • the place mentioned above is only what illustrated embodiment of this invention, and this invention can add a various change within the description range of a claim.
  • the present invention even if the amount of expensive Ni added is reduced, corrosion resistance comparable to that of SUS304 steel can be obtained, so that a member requiring corrosion resistance can be provided at low cost.
  • the present invention has high utility value industrially.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention porte sur un acier inoxydable ayant une excellente résistance à la corrosion, qui est caractérisé en ce qu'il contient, en % en masse, 0,1% ou moins de C, 1,0% ou moins de Si, 0,045% ou moins de P, 0,005% ou moins de S, 17 à 22% de Cr, 4 à 12% de Mn, 2 à 6% de Ni, 0,5 à 3% de Cu et 0,05 à 0,3% de N, et en ce qu'il contient de plus du La et/ou du Ce respectivement en une quantité supérieure ou égale à 0,006% mais inférieure ou égale à 0,2% du total, le reste étant constitué de Fe et d'impuretés inévitables.
PCT/JP2010/065091 2009-09-02 2010-08-27 Acier inoxydable à faible teneur en ni ayant une excellente résistance à la corrosion WO2011027847A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2011529948A JP5528459B2 (ja) 2009-09-02 2010-08-27 耐食性に優れた省Ｎｉ型ステンレス鋼
CN201080035815.3A CN102471855B (zh) 2009-09-02 2010-08-27 耐蚀性优良的省Ni型不锈钢

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-202658 2009-09-02
JP2009202658 2009-09-02

Publications (1)

Publication Number Publication Date
WO2011027847A1 true WO2011027847A1 (fr) 2011-03-10

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PCT/JP2010/065091 WO2011027847A1 (fr) 2009-09-02 2010-08-27 Acier inoxydable à faible teneur en ni ayant une excellente résistance à la corrosion

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JP (1) JP5528459B2 (fr)
CN (1) CN102471855B (fr)
TW (1) TWI412610B (fr)
WO (1) WO2011027847A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI476389B (zh) * 2013-05-29 2015-03-11 China Steel Corp Quickly evaluate the method of resisting the rust resistance of steel strip

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS505972B1 (fr) * 1970-05-11 1975-03-10
JPH0770700A (ja) * 1993-08-31 1995-03-14 Nidatsuku Kk 高耐力高耐食性オーステナイト系ステンレス鋳鋼
JP2005154890A (ja) * 2003-11-07 2005-06-16 Nippon Steel & Sumikin Stainless Steel Corp 加工性に優れたオ−ステナイト系高Ｍｎステンレス鋼
JP2006022369A (ja) * 2004-07-07 2006-01-26 Nippon Steel & Sumikin Stainless Steel Corp 張出し性と耐発銹性に優れた低Ｎｉオ−ステナイト系ステンレス鋼

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS505972A (fr) * 1973-05-21 1975-01-22
JP3691341B2 (ja) * 2000-05-16 2005-09-07 日新製鋼株式会社 精密打抜き性に優れたオーステナイト系ステンレス鋼板
JP3696552B2 (ja) * 2001-04-12 2005-09-21 日新製鋼株式会社 加工性，冷間鍛造性に優れた軟質ステンレス鋼板
SE525252C2 (sv) * 2001-11-22 2005-01-11 Sandvik Ab Superaustenitiskt rostfritt stål samt användning av detta stål
CN1772942A (zh) * 2005-09-12 2006-05-17 钢铁研究总院 节镍型奥氏体含稀土不锈钢及其制备方法
CN100507054C (zh) * 2005-11-29 2009-07-01 宝山钢铁股份有限公司 耐腐蚀延伸性好的低镍奥氏体不锈钢
CN101215674B (zh) * 2008-01-08 2010-11-03 上海大学 经济型双相不锈钢合金材料及其制备方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS505972B1 (fr) * 1970-05-11 1975-03-10
JPH0770700A (ja) * 1993-08-31 1995-03-14 Nidatsuku Kk 高耐力高耐食性オーステナイト系ステンレス鋳鋼
JP2005154890A (ja) * 2003-11-07 2005-06-16 Nippon Steel & Sumikin Stainless Steel Corp 加工性に優れたオ−ステナイト系高Ｍｎステンレス鋼
JP2006022369A (ja) * 2004-07-07 2006-01-26 Nippon Steel & Sumikin Stainless Steel Corp 張出し性と耐発銹性に優れた低Ｎｉオ−ステナイト系ステンレス鋼

Also Published As

Publication number Publication date
CN102471855A (zh) 2012-05-23
CN102471855B (zh) 2015-10-14
TWI412610B (zh) 2013-10-21
JPWO2011027847A1 (ja) 2013-02-04
JP5528459B2 (ja) 2014-06-25
TW201113382A (en) 2011-04-16

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