WO2008018242A1 - 二相ステンレス鋼 - Google Patents
二相ステンレス鋼 Download PDFInfo
- Publication number
- WO2008018242A1 WO2008018242A1 PCT/JP2007/062471 JP2007062471W WO2008018242A1 WO 2008018242 A1 WO2008018242 A1 WO 2008018242A1 JP 2007062471 W JP2007062471 W JP 2007062471W WO 2008018242 A1 WO2008018242 A1 WO 2008018242A1
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- WIPO (PCT)
- Prior art keywords
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- steel
- stainless steel
- toughness
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/005—Manufacture of stainless steel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
Definitions
- the present invention relates to a duplex stainless steel with excellent corrosion resistance used in corrosive environments such as chloride environments.
- the solidification structure is finely controlled, so that steel or thick forged steel or
- the present invention relates to a duplex stainless steel capable of providing good mechanical properties as a hot rolled steel material.
- the steel of the present invention can be used as pumping material for seawater desalination, equipment, and chemical tank materials.
- Duplex stainless steels generally have poor toughness compared to austenitic stainless steels because they have a ferrite phase in addition to an austenite phase that is not likely to cause brittle fracture.
- the size of the solidified structure of the ferrite phase affects the toughness reduction factor.
- toughness generally improves as the structure becomes finer, but duplex stainless steel solidifies in a ferrite-single phase, and the solidified structure generally falls within the coarse ferrite phase and its grain boundaries and grains. Since it is composed of finely precipitated austenite phase, the influence of the coarse ferrite phase is brought to the final product as it is, especially in forged products and thick plate products.
- the present inventors related to a method using the nuclear action of TiN on ⁇ iron disclose the first four patents related to ferrite stainless steel and the next two patents are high.
- ⁇ 5 relates to austenitic stainless steel containing ferrite
- the last patent relates to duplex stainless steel.
- JP-A-2002-69592 and JP-A-1-100248 relate to the invention including the duplex stainless steel similar to the present invention, both of which are hot. It is intended to improve workability, and no consideration is given to toughness.
- the present invention improves the impact characteristics of duplex stainless steel thick steel.
- the objective is to provide a duplex stainless steel with excellent corrosion resistance by clarifying the optimum control method for Ti and N contents and Mg contents as the chemical composition of this steel.
- the present inventors made a soot mass by a melting experiment of adding Ti and Mg in a duplex stainless steel containing 0.10% or more of N, and a refined experiment of reducing Mg from a refractory or slag.
- the present invention was obtained as a result of repeated observation of the solidification structure of the lump and evaluation of impact properties of the thick steel plate obtained by hot rolling the lump.
- the gist of the present invention is as follows.
- Duplex stainless steel with excellent workability. Further, as required, V: 0.05 to 1.0%, Nb: 0.01 to 0.20%, W: 0.05 to 3.0%, Co: 0.05 to 1.0% Alternatively, it is a duplex stainless steel excellent in hot workability characterized by containing two or more kinds.
- f N is a numerical value that satisfies the following formula (1).
- Fig. 1 shows an example of cross-sectional macro-structural refinement of a 50 kg steel ingot by the addition of Ti and Mg, where a) shows no Mg addition and b) shows the case with Mg addition.
- Figure 2 is a diagram showing a ferrite relationship grain size and f N XTiXN duplex stainless ⁇ which contains a Mg.
- Figure 3 shows the Tix N content of 25% Cr_ 5% Ni—0.3% Mo—1.5% Cu—0.22% thick steel duplex steel with Mg-added steel (Mg content is about 0.001%). It is a figure which shows the relationship of an impact characteristic.
- C is limited to a content of 0.06% or less in order to ensure the corrosion resistance of stainless steel. If the content exceeds 0.06%, Cr carbide is generated and the corrosion resistance and toughness deteriorate.
- P is limited to 0.05% or less because it degrades hot workability and toughness. Preferably, it is 0.03% or less.
- S is limited to 0.010% or less because it also degrades hot workability, toughness, and corrosion resistance. Preferably, it is 0.0020% or less.
- Ni is contained in an amount of 1.0% or more in order to stabilize the austenite structure, improve the corrosion resistance against various acids, and improve toughness. On the other hand, it is an expensive alloy and its content is limited to 10.0% or less from the viewpoint of cost.
- Cr should be contained in an amount of 18% or more to ensure basic corrosion resistance. On the other hand, if the content exceeds 30%, intermetallic compounds are liable to precipitate and impair toughness. Therefore, the Cr content is set to 18% or more and 30% or less.
- Mo is a very effective element that additionally enhances the corrosion resistance of stainless steel.
- Mo is contained in a range of 5.0% or less.
- the upper limit is defined as 5.0% or less.
- a desirable content is 0.5 to 3.0%.
- Cu is an element that additionally enhances the corrosion resistance of stainless steel to acids. For this purpose, it is contained within a range of 3.0% or less. If it exceeds 3.0%, ⁇ Cu precipitates beyond the solid solubility and causes embrittlement, so the upper limit was made 3.0%.
- a desirable content is 0.3 to 2.0%.
- N is an effective element that improves the strength and corrosion resistance by dissolving in the austenite phase. Therefore, 0.10% or more is included.
- the solid solution limit increases with the Cr content, but if it exceeds 0.40%, Cr nitride is precipitated and the toughness is inhibited, so the upper limit of the content was set to 0.40%.
- a preferable content is 0.10 to 0.35%.
- A1 is an important element for deoxidation of steel, and it is added together with Si to reduce oxygen in the steel. If the Si content exceeds 0.3%, it may not be necessary to add it. However, the reduction of the oxygen content is essential for securing toughness, and for this reason, a content of 0.001% or more is necessary.
- A1 is an element that has a relatively large affinity with N, and if added excessively, A1N is produced, impairing the toughness of stainless steel. The degree depends on the N content, but when A1 exceeds 0.08%, the toughness deteriorates significantly, so the upper limit of the content was set to 0.08%. Preferably it is 0.05% or less
- Ti is an element that forms oxides, nitrides, and sulfides in a very small amount to refine the crystal grains of the steel, and is an element that is actively included in the steel of the present invention.
- the steel according to the present invention having a high N content produces TiN, which acts as a core of ⁇ Fe and refines the ferrite grain size.
- the content exceeds 0.05%, even when the N content is the smallest, coarse TiN is generated and the toughness of the steel is inhibited. For this reason, the content is determined to be 0.003 to 0.05%.
- the smaller the Ti content the better the impact characteristics and the better
- the content is 0.003 to 0.020%, more preferably 0.003 to 0.010%.
- Mg dissolves in the steel and exists as an oxide such as MgO or MgO ⁇ A 1 2 0 3 and acts as a nucleus for the precipitation of TiN, while the Mg oxide itself is ⁇ 5 Fe. It may also have a nuclear action.
- Mg element is an indispensable element for refining the solidified structure with a small Ti and N content.
- the metal Mg raw material may be added to the molten steel or in a vertical shape, or may be reduced and contained from the refractory material slag.
- MgO 'A 1 2 0 3 is acid-insoluble, and the acid-soluble Mg content and total Mg content of steels containing it are different, but here the oxides have an effect on the refinement of the solidification structure. Therefore, the content was determined by total Mg analysis.
- the Mg content necessary to refine the solidification structure depends on the Ti content, but at least 0.0001% was required. On the other hand, if contained in a large amount, hard non-metallic inclusions increase, which impairs toughness. For this reason, 0.0030% was made the upper limit of the content.
- the Mg content is preferably as small as the solidification structure of the steel becomes finer. However, considering the stability of realizing the refinement of the solidification structure, the preferred content is 0.0003 to 0.0015%.
- N XTiXN has its lower limit determined by whether TiN can be precipitated before ⁇ 5 Fe crystallizes.
- New is the activity coefficient of N, satisfies the accordance with (1) the relationship between the composition of the steel.
- the coefficient for the elemental content defined in the equation is the interaction aid coefficient for the activity of soot taken from the recommended values of the 19th committee of Gakushin. Because the Ti content of the steel of the present invention is very small, the N activity correction term due to Ti is ignored, and the effects of Cr, Ni, Cu, Mn, Mo, and Si contained in the duplex stainless steel are considered. Equation (1) was used.
- the inventors of the present invention have investigated the refinement conditions of the solidified structure by adding 0.0001 to 0.0030% Mg in a duplex stainless steel containing 0.1% or more of N in a small amount range of Ti content of 0.05% or less. As a result, it was found that the lower limit of f N xTixN that can refine the ferrite crystal grain size in Mg-containing duplex stainless steel was 0.00004% 2 , and it was set to 0.00004% 2 (see Figs. 1 and 2). .
- O is an important element that constitutes oxides that are representative of non-metallic inclusions. Excessive inclusion inhibits toughness. In addition, the formation of coarse cluster oxides causes surface defects. Therefore, the upper limit of the content is set to 0.010%. Preferably it is 0.005% or less.
- V, Nb, and W are elements that are selectively added to further enhance the corrosion resistance of the duplex stainless steel.
- V is added in an amount of 0.05% or more for the purpose of improving the corrosion resistance, but if it exceeds 1.0%, coarse V-based carbonitrides are formed and the toughness deteriorates. Therefore, the upper limit is limited to 1.0%.
- the preferred content when added is in the range of 0.1-0.5%.
- Nb is added in an amount of 0.01% or more in order to improve the corrosion resistance.
- Nb is an element that can form carbides and nitrides more strongly than V, and has the effect of suppressing grain growth and strengthening steel. For this reason, excessive addition impedes toughness, so the upper limit of its content was set to 0.20%.
- a preferable content range when added is 0.05% to 0.15%.
- W like Mo, is an element that additionally improves the corrosion resistance of stainless steel, and has a higher solid solubility than Nb and V. For the purpose of enhancing the corrosion resistance in the steel of the present invention, 0.05 to 3.0% is contained.
- Co is an element effective for enhancing the corrosion resistance and toughness of steel and is selectively added. If the content is less than 0.05%, the effect is small, and if it exceeds 1.0%, the effect is saturated, and since it is an expensive element, the effect commensurate with the cost will not be exhibited. . Therefore, the content when added is set to 0.05 to 0%.
- S and A 1 and B, Ca, Mg, and REM are limited as follows.
- a 1 is an element necessary for desulfurization in addition to deoxidation of steel, and should be contained at 0.0 10% or more.
- the upper limit is 0.080% as in claim 1.
- B, Ca, and REM are all elements that improve the hot workability of steel, and one or more of them are added for that purpose. Too much B, Ca, and REM, on the other hand, lowers the hot workability and toughness, so the upper and lower limits were set as follows.
- B and Ca are 0.0005 to 0.0050%, and REM is 0.005 to 0.10%.
- REM is the total content of lanthanide rare earth elements such as La and Ce.
- Table 1 shows the chemical composition of the test steel.
- Fe and unavoidable impurity sources It is prime.
- the part where the content is not described indicates the impurity level.
- REM means a lanthanide-based rare earth element, and the content indicates the total of these elements.
- the steel melted in this way was produced into a flat steel ingot with a thickness of about 100 mm, or into a steel ingot with a thickness of about 70 dragons by splitting for 2 minutes.
- the macrostructures can be classified into those with columnar crystals in the surface layer (Fig. 1a) and those with fine equiaxed crystals on the entire surface (Fig. 1b)). All of the equiaxed crystals solidified as a whole exhibited a fine structure with a ferrite grain size of around 1 mm (Fig. 1-b) and Fig. 2). The ferrite phase ratio was measured for this macro sample by means of a ferrimetric method, and it was in the range of 30 to 70%.
- the material for hot rolling is processed from the main body of the above steel ingot, heated to a temperature of 1100 to 1250: 1 to 2 hours depending on the component system, rolled at a finishing temperature of 950 to 850, and 12mm thick A hot rolled steel sheet was obtained.
- spray cooling was performed to 200 or less from a state where the steel material temperature immediately after rolling was 800 or more.
- the final solution heat treatment was carried out under conditions of 1000-1100 and water cooling after soaking for 20 minutes.
- JIS No. 4 V-notch Charbee test pieces were cut out from the direction perpendicular to the rolling direction, and each V notch was processed so that the fracture propagated in the rolling direction.
- the impact value at 0 was measured with the test machine.
- Table 2 shows the macrostructure of the steel ingot obtained from the above evaluation, the impact transition temperature of the steel ingot, and the impact value in the direction perpendicular to the rolling at 0 for the drawn steel and steel plate at 900.
- “ ⁇ ” indicates the entire equiaxed crystal structure
- “X” indicates the structure in which columnar crystals are formed in the surface layer. All the steels of the present invention showed a structure of “ ⁇ ”.
- the impact transition temperature indicates the energy transition temperature, and all of the steel ingots of the present invention showed 0 and the following good values.
- the drawing at 900 shows 70% or more, and in No. 1 and 2, desulfurization was performed using flux.
- Steels of 4, 5, 7, and 8 also showed a value of 70% or more.
- the impact value of the thick steel plate shows a high value of about 300 J / cm 2 or more in the steel of the present invention.
- No. 2 with S exceeding 0.005% and No. 15 with Cr exceeding 28% exceptionally show impact values of less than 300 J cm 2 . This is probably because the adverse effect on the impact characteristics slightly exceeded the effect of the refined solidified structure. In any case, a good value of 250 JZ cm 2 or more is shown.
- duplex stainless steels that are superior in corrosion resistance in chloride environments and impact characteristics more than ever.
- pump materials for seawater desalination, equipment, and chemical tank materials For example, pump materials for seawater desalination, equipment, and chemical tank materials.
- the present invention steel can be used, and the industrial contributions are extremely large.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/991,671 US8778260B2 (en) | 2006-08-08 | 2007-06-14 | Duplex stainless steel |
CN200780000957.4A CN101346486B9 (zh) | 2006-08-08 | 2007-06-14 | 双相不锈钢 |
EP07745544A EP2050832B1 (en) | 2006-08-08 | 2007-06-14 | Two-phase stainless steel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006215738A JP5072285B2 (ja) | 2006-08-08 | 2006-08-08 | 二相ステンレス鋼 |
JP2006-215738 | 2006-08-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008018242A1 true WO2008018242A1 (ja) | 2008-02-14 |
WO2008018242A9 WO2008018242A9 (ja) | 2008-07-24 |
Family
ID=39032779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/062471 WO2008018242A1 (ja) | 2006-08-08 | 2007-06-14 | 二相ステンレス鋼 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8778260B2 (ja) |
EP (1) | EP2050832B1 (ja) |
JP (1) | JP5072285B2 (ja) |
KR (1) | KR20080038217A (ja) |
CN (1) | CN101346486B9 (ja) |
WO (1) | WO2008018242A1 (ja) |
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CN103498113A (zh) * | 2008-03-26 | 2014-01-08 | 新日铁住金不锈钢株式会社 | 焊接热影响区的耐蚀性和韧性良好的合金节省型双相不锈钢 |
US9862168B2 (en) | 2011-01-27 | 2018-01-09 | Nippon Steel & Sumikin Stainless Steel Corporation | Alloying element-saving hot rolled duplex stainless steel material, clad steel plate having duplex stainless steel as cladding material therefor, and production method for same |
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CN103498114B (zh) * | 2008-03-26 | 2016-03-09 | 新日铁住金不锈钢株式会社 | 焊接热影响区的耐蚀性和韧性良好的合金节省型双相不锈钢 |
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US20090098007A1 (en) | 2009-04-16 |
CN101346486B (zh) | 2010-12-15 |
CN101346486B9 (zh) | 2021-08-24 |
CN101346486A (zh) | 2009-01-14 |
US8778260B2 (en) | 2014-07-15 |
EP2050832B1 (en) | 2012-05-16 |
KR20080038217A (ko) | 2008-05-02 |
JP5072285B2 (ja) | 2012-11-14 |
EP2050832A1 (en) | 2009-04-22 |
EP2050832A4 (en) | 2010-12-29 |
JP2008038214A (ja) | 2008-02-21 |
WO2008018242A9 (ja) | 2008-07-24 |
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