CN101688278A - Ferritic stainless steel having excellent atmospheric corrosion resistance - Google Patents
Ferritic stainless steel having excellent atmospheric corrosion resistance Download PDFInfo
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- CN101688278A CN101688278A CN200880023986A CN200880023986A CN101688278A CN 101688278 A CN101688278 A CN 101688278A CN 200880023986 A CN200880023986 A CN 200880023986A CN 200880023986 A CN200880023986 A CN 200880023986A CN 101688278 A CN101688278 A CN 101688278A
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
Disclosed is a ferritic stainless steel having excellent atmospheric corrosion resistance, which comprises the following components (by mass): C: 0.020% or less, N: 0.020% or less, Si: 0.01-1.0%, Mn:0.01-0.5%, P: 0.04% or less, S: 0.01% or less, Cr: 16.0-23.0%, Mo: 0.30-3.00% and Ni: 0.30-3.00%, and further comprises one or two components selected from the following components (by mass): Ti: 0.05-0.25% and Nb: 0.05-0.40%, with the remainder being Fe and unavoidable impurities; and which has an atmospheric corrosion index (RI) and a pitting corrosion index (PI) fulfilling the requirements represented by the formulae (A) and (B), respectively. RI = Mo+LogNi = 0 (A) PI = Cr+3.3Mo = 19 (B).
Description
Technical field
In the stainless steel that the present invention relates to use in having the structure in gap, tolerance is from the ferrite-group stainless steel that has excellent atmospheric corrosion resistance of the stream rust in this gap.
The application with on September 27th, 2007 spy in Japanese publication be willing to 2007-251377 number and on August 22nd, 2008 spy in Japanese publication be willing to serve as for 2008-213400 number that right of priority is advocated in the basis application, quote its content here.
Background technology
Stainless steel has superior corrosion resistance, is used for the family kitchen equipment class such as outer decoration material, tank and refrigerator of roof Material or door and window etc. or household electrical appliances etc., and other multiple use always.These purposes are selected stainless kind by the environment that imagination is used separately, but it is selected when wrong or actual corrosive environment when being harsher condition at this, because of corrosion produces rust, not only diminish view or appearance, if the functional material of jar etc., leak in addition or destructive danger, if food uses or galley equipment, then might produce problems such as the taste that makes food or color deterioration.Therefore, the selected of material of suitable environment for use is a very important technology.
The general SUS304 that extensively adopts solidity to corrosion and processibility both sides to have both as stainless steel., SUS304 has the fatal problem that produces stress corrosion cracking in containing the environment of chloride ion.In addition, recently, the Ni cost of material is surging, and the price of SUS304 is also surging thereupon.Therefore strong hope changes the high-purity ferritic stainless steel that becomes not contain Ni.
As one of purposes that adopts this ferrite-group stainless steel, can list the roof material.Here, also effectively utilized the thermal expansivity characteristic lower than austenite stainless steel in the lump with erosion resistance, range of application enlarges.The desired erosion resistance level of this roof material non-corrosive importantly in the design of buildings.As the conventional art in this purposes, as Japanese kokai publication hei 6-346195 communique (following patent documentation 1), and Japanese kokai publication hei 6-346197 communique (following patent documentation 2) as described in, think material spot corrosion generation number: the material that Cr+3Mo is big is relatively good, for example adopts SUS445M2 etc. now always.
As the Application Areas of other ferrite-group stainless steel, can list functional materialss such as tank material.It requires characteristic is to prevent from jar to bore a hole, but austenite stainless steel produces stress corrosion cracking under this environment, so is not preferred.Ferrite-group stainless steel is immune owing to the counter stress etching crack, thereby no problem in this, but the crevice corrosion of clearance portion becomes problem.So,, importantly suppress the growth of crevice corrosion for the application of ferrite-group stainless steel in this purposes.As this conventional art, as described in TOHKEMY 2006-257544 communique (following patent documentation 3), disclose and added the element as the etch depth that reduces corrosion hole such as Ni, Cu, Mo.
In this external Japanese kokai publication hei 7-34205 communique (following patent documentation 4), think that adding P is effective as the element that suppresses crevice corrosion.But the purpose of above-mentioned document all is how to reduce the maximum corrosion hole degree of depth, and corrosion hole is not connected.Etching extent itself does not become problem in this purposes, even thereby do not produce perforation, whole etching extent also increases, consequently, might flow because of mostly occurring becomes rusty makes the non-constant of outward appearance.
Patent documentation 1: Japanese kokai publication hei 6-346195 communique
Patent documentation 2: Japanese kokai publication hei 6-346197 communique
Patent documentation 3: TOHKEMY 2006-257544 communique
Patent documentation 4: Japanese kokai publication hei 7-34205 communique
On the other hand, as the purposes of extensive employing SUS304, be mostly the outer decoration material of building materials and open air etc.In this purposes, strict to outward appearance unlike roof Material, the degree that the rust of a little takes place allows, and requires to avoid but the significant stream rust as red rust flows in appearance more.In such purposes, directly adopting under the situation of ferrite-group stainless steel in the past, stream becomes rusty very eye-catching or has to adopt the high price ferrite-group stainless steel that contains a large amount of Mo.Therefore, wish to improve atmospheric corrosion resistance by ferrite-group stainless steel being formed suitable alloy composition.
Here said atmospheric corrosion resistance refers to, be not etching extent is reduced, even but expression produce and corrode also that difficulty makes this effusive character of becoming rusty, the easier character that rests in this gap of rust in crevice corrosion particularly.Stream rust is oxyhydroxide and the oxide compound that the metal ion that produces takes place because of corrosive, therefore must suppress the corrosive generation and two aspects of growing simultaneously, compares with the perforation that suppresses crevice corrosion singlely, and the requirement on the erosion resistance is tighter.
Summary of the invention
The present invention is from so unexistent neodoxy the requirement to erosion resistance in the past, and the stainless steel that can suppress to flow rust is studied, and purpose provides the good ferrite-group stainless steel of a kind of rust corrosion of anti-stream property.
The present invention is from above-mentioned unexistent neodoxy the requirement to erosion resistance in the past, the stainless steel that can suppress to flow rust is studied, the result provides a kind of rust corrosion of anti-stream property good ferrite-group stainless steel, is the following content of putting down in writing in the technical scheme as the place of the main idea of this ferrite-group stainless steel.
(1) a kind of cable system stainless steel that has excellent atmospheric corrosion resistance is characterized in that:
In quality % contain below the C:0.020%, below the N:0.020%, Si:0.01～1.0, Mn:0.01～0.5%, below the P:0.04%, below the S:0.01%, Cr:16.0～23.0%, Mo:0.30～3.00%, Ni:0.30～3.00%;
Also contain any one or two kinds of in Ti:0.05～0.25%, Nb:0.05～0.40%, surplus is Fe and unavoidable impurities, and stream rust index RI satisfies following formula (A), and spot corrosion indices P I satisfies following formula (B).
RI＝Mo+LogNi≥0 (A)
PI＝Cr+3.3Mo≥19 (B)
(2) according to above-mentioned (1) the described ferrite-group stainless steel that has excellent atmospheric corrosion resistance, it is characterized in that: also contain Cu:0.30～3.00%, and stream rust index RI ' satisfies following formula (C).
RI′＝Mo+LogNi+0.2Cu≥0 (C)
(3) according to above-mentioned (1) or (2) the described ferrite-group stainless steel that has excellent atmospheric corrosion resistance, it is characterized in that: also contain more than any one or two kinds of in Al:0.01～0.20%, B:0.0001～0.003%, V:0.03～1.0%.
(4) according to each described ferrite-group stainless steel that has excellent atmospheric corrosion resistance in above-mentioned (1) to (3), it is characterized in that: also contain any one or two kinds of in Sn:0.005～1.0%, Sb:0.005～1.0%.
According to the present invention, Ni, the Mo of heavy addition high price also can suppress the ferrite-group stainless steel that the most debatable in appearance stream becomes rusty even can provide not.This kind steel plate plays following effect, that is, in the purposes around water, used of the decorative material that uses out of doors or outdoor equipment class, other household electrical appliances and galley equipment etc. and then have industrial useful significant effect such as effective especially when being easy to generate the corrosive interstitial structure.
Description of drawings
Fig. 1 is the figure of expression for the shape of the sample of test.
Fig. 2 is in the gap of representing after the test of artificial seawater cyclic corrosion is implemented and the figure of the rust degree outside the gap.
Fig. 3 is the synoptic diagram of the depth of corrosion of the gap internal corrosion portion after the test of expression artificial seawater cyclic corrosion is implemented.
Fig. 4 is the anti-stream of expression rust index RI ' and the figure of the relation of pitting corrosion resistance index PI.
Embodiment
The present invention is by set this notion of atmospheric corrosion resistance of the clearance portion of not considering in the past, understood the proper range of Cr, Mo, Ni, Cu, and the ferrite-group stainless steel that has excellent atmospheric corrosion resistance of clearance portion can be provided thus.
About the atmospheric corrosion resistance of this clearance portion, adopt the material that has changed multiple composition to estimate, the result understands fully following situation.That is to say, understand: (1) is about atmospheric corrosion resistance, except corrosion speed is low, the ion of necessary coexistence Ni, Mo in the rust liquid, (2) are even the high composition of pitting potential produces the also merely improvement of stream rust property when corroding in addition, particularly when Cr content was high, stream rust property is variation on the contrary.
As the one example, adopt the artificial seawater of the outdoor atomospheric corrosion environment of simulation to implement the cyclic corrosion test, the rust degree in convection current rust and the gap is estimated then, shows evaluation result.Adopt sample shown in Figure 1 as sample.#600 wet grinding precision work is carried out on the surface for the examination material to two pieces of various compositions, forms the gap by spot welding then.The test conditions of artificial seawater cyclic corrosion test is, as 1 circulation, implements 12 circulations with 35 ℃, 4 hours → dry 60 ℃, 2 hours → moistening 50 ℃ of artificial seawater sprayings, relative humidity more than 90%, 2 hours total 8 hours altogether.It is that benchmark is set that this cycle number embodies with the degree that can not ignore with the rust staining at the SUS304 upper surface.In device, test materials is set with respect to vertical direction with tilting 30 degree.
The evaluation method of stream rust is by following enforcement.With the sample that varies in size is overlapping and in the clearance portion that forms from the effusive rust in the bottom of small sample as evaluation portion.As this method, the Sample Image after the picked-up test, wherein image length be from the lower end of small sample to the lower end of bulk specimen, it is wide as plate to get the figure image width, by it is carried out picture processing and the part binaryzation of only will become rusty, derives thus and flows the area occupation ratio that becomes rusty.Should flow the rust area occupation ratio during evaluation again and be categorized as 5 grades.Classification is set according to as described below: scoring 1: stream rust area occupation ratio is more than 75%, and is the poorest; Below mark 2: be lower than 75% and more than 50%; Scoring 3: be lower than 50% and more than 20%; Scoring 4: be lower than 20% and more than 10%; Below the scoring 5:10%, qualified with being defined as more than 4.
This result's a example is shown with synoptic diagram among Fig. 2.In the figure, the part of painted black obtains the stream rust binaryzation from the gap, and gray part is that the rust generating unit binaryzation in the gap is got.Consequently, the rust of stream rust and clearance portion takes place all remarkable in steel 1:16Cr-0.3Ni-0.1Mo in the past, rust area in steel 2:22.4Cr-0.1Ni-0.1Mo intermediate gap in the past is little, but not have discovery that bigger difference is arranged from the stream rust in gap and steel 1 in the past.On the other hand, as can be known at the exploitation steel: the rust area in the 19Cr-1.0Ni-1.1Mo intermediate gap is not little, but has suppressed the stream rust.The schematic cross-section of the corrosion portion of this moment shown in Fig. 3.Not only area is big but also the degree of depth is also dark in the many steel in the past 1 of stream rust.In steel 2 in the past, corroded area is little but depth of corrosion is dark.On the other hand, in the exploitation steel, though big its depth as shallow of corrosion portion area.The inhibition of inferring this depth of corrosion is to suppress one of reason of stream rust.By above-mentioned cyclic corrosion test the various chemical constitutions shown in the embodiment are estimated, the result draws, and can adjust by following relational expression.That is to say that if get RI '=Mo+LogNi+0.2Cu as stream rust index, get PI=Cr+3.3Mo as the pitting corrosion resistance index, then as shown in Figure 4, atmospheric corrosion resistance becomes good in the composition of the scope of representing RI ' 〉=0, PI 〉=19.
In addition, the stream rust index when not containing Cu is RI=Mo+LogNi, and atmospheric corrosion resistance becomes good in the composition of the scope of representing RI 〉=0, PI 〉=19.
As obtaining the reason that above-mentioned stream rust suppresses effect, deduction is because not only suppressed spot corrosion generation itself with Cr and Mo, but also has suppressed the stream rust by Ni, Mo, Cu etc.Infer that this is that result because of following one or more effects realizes that is: the complexing ion of each element interacts by it and forms big complexing ion, becomes to be difficult to the mobile rust; The inflow of the water that the further inhibition of this big complexing ion is contained salt when gapped; Cu separates out at active site as metal Cu in rust in addition, promotes passive stateization etc. again.
Detailed regulation to above-mentioned composition describes below.In the following description, the content of each chemical ingredients is represented quality %.
Cr guarantee stainless erosion resistance aspect be most important element owing to make the ferritic structure stabilization, therefore need 16.0% at least.If Cr is increased then the erosion resistance raising, but processibility, manufacturing are descended, therefore the upper limit is defined as 23.0%.Be preferably 18.5～22.0%, more preferably 19.0～21.5%.
Mo has effect to the repairing of passive state epithelium, is unusual effective elements for improving erosion resistance.And have by with Cr combination make pitting corrosion resistance improve, by with the effect of Ni combination improvement atmospheric corrosion resistance.Therefore Mo need contain 0.30% at least.If increase Mo, though then erosion resistance improves, processibility is descended, cost increases in addition, therefore the upper limit is defined as 3.00%.Be preferably 0.50～2.00%, more preferably 0.70～1.80.
Ni suppresses active dissolution speed, and has very much effect for passive stateization, is most important element in the present invention.At least need 0.30% Ni in order to embody this effect.Superfluous interpolation not only makes processibility descend, make the ferritic structure instability, but also cost is worsened, and therefore the upper limit is defined as 3.00%.Be preferably 0.55～1.90%, more preferably 0.70～1.70%.
Below other chemical constitution of stipulating in addition among the present invention is elaborated.
C must reduce its content because of anti-grain boundary corrosion, processibility are descended, and therefore its upper limit is defined as below 0.020%.Reduction exceedingly can make the refining cost worsen, and therefore more preferably 0.002～0.010%.
N and C must reduce its content because of anti-grain boundary corrosion, processibility are descended equally, therefore its upper limit are defined as 0.020%.But reduction exceedingly can make the refining cost worsen, therefore more preferably 0.002～0.010%.
Si is important element as deoxidant element, also is effectively for erosion resistance, scale resistance, but the over-drastic interpolation descends processibility, manufacturing.Therefore its content is defined as 0.01～1.0%, more preferably 0.03～0.6%.
Mn is important element as deoxidant element, if but add superfluously then become easily the MnS of corrosive starting point, make the ferritic structure instabilityization in addition, so its content is defined as 0.01～0.5%, more preferably 0.05～0.3%.
P not only makes weldability, processibility descend, but also is easy to generate grain boundary corrosion, thereby need suppress it lower.Therefore its content is defined as below 0.04% more preferably 0.001～0.02%.
S needs to reduce because of the water-soluble inclusion that generation CaS and MnS etc. become the corrosion starting point.Therefore its content is defined as below 0.01%.But exceedingly reduce the deterioration that causes cost, therefore more preferably below 0.001～0.05%.
Nb at the grain boundary corrosion of fixation of C, N, inhibition weld part, to improve aspect the processibility be very important element.Therefore Nb need be added to (C+N) and more than 8 times.But superfluous interpolation descends processibility, is 0.05～0.40% with its scope dictates therefore, more preferably 0.1～0.30%.
Ti has the effect same with Nb, needs more than 4 times of (C+N) for fixation of C, N.But superfluous interpolation becomes the reason of the surface imperfection when making, and is 0.05～0.25% with its scope dictates therefore, more preferably 0.08～0.20%.
About Nb and Ti, need to add one or more, when combination is added two kinds, preferably with (Ti+Nb)/(C+N) be defined as more than 6.
In order to ensure atmospheric corrosion resistance, can add Cu as required.Cu not only makes active dissolution speed descend, and promotes that the effect of passive stateization is big.In addition as previously mentioned, by also having the effect that suppresses the stream rust with Ni, Mo combination.But superfluous interpolation descends processibility, thereby is 0.30～3.00% with its scope dictates when adding, more preferably 0.40～2%.
Al is important as deoxidant element, and the composition that has the control non-metallic inclusion in addition makes the effect of organizing miniaturization.If add superfluously, then cause thickization of non-metallic inclusion, might become the starting point of goods generation defective.Therefore, undergage is decided to be 0.01%, the upper limit is defined as 0.20%.More preferably 0.03～0.15%.
V can improve resistance to rust and anti-crevice corrosion, adds V if suppress the use of Cr, Mo, then also can guarantee good processibility., the over-drastic of V adds except making processibility descends, and the effect that improves erosion resistance is also saturated, and therefore the undergage with V is decided to be 0.03%, the upper limit is defined as 1.0%, and more preferably 0.05～0.50%.
B is effective grain-boundary strengthening element for improving secondary processing brittleness, but the over-drastic interpolation makes the ferrite solution strengthening, becomes the reason that ductility reduces.Therefore undergage is decided to be 0.0001%, the upper limit is defined as 0.003%, more preferably 0.0002～0.0020%.
In order to ensure atmospheric corrosion resistance, can also add Sn, Sb as required.Sn, Sb are important elements for suppressing corrosion speed, but superfluous interpolation worsens manufacturing and cost, thereby its scope all is defined as 0.005～1.0%, more preferably 0.05～0.5%.
Surplus beyond the above-mentioned chemical ingredients is Fe and unavoidable impurities.
Embodiment
The steel that adopts the manufacture method manufacturing of common high-purity ferritic stainless steel to have the chemical constitution shown in table 1, the table 2.That is to say that at first make the thick steel ingot of 40mm after vacuum melting, it is thick by hot rolling it to be rolled down to 5mm.Then, carried out 950～1000 ℃ * 1 minute thermal treatment based on recrystallize behavior separately after, grinding removes descaling, again the steel plate by cold rolling manufacturing 0.8tmm.As final annealing, it is heat-treated under 950～1000 ℃ * 1 minute condition based on recrystallize behavior separately, supply in following test.Moreover, when austenite stainless steel, thermal treatment temp is defined as 1100 ℃.
About the evaluation of atmospheric corrosion resistance,, adopt test film with gap in order more to be easy to generate the stream rust.From the steel plate of above-mentioned manufacturing test film, adopt sand paper will comprise that whole wet grinding of end face is to #600 by cutting-out 40mm * 70mm shown in Figure 1 and 30mm * 40mm.Then, overlapping center separately, the spot welding central part is as the test film that has the gap.Adopt this test film, with above-mentioned employing the compound cycle corrosion test of artificial seawater implement 12 circulations.Evaluation method is divided into 5 grades according to the area occupation ratio that flows rust and estimates as previously mentioned.
About the evaluation of anticorrosion stress-resistant crackle, adopt the test film of 30mm * 30mm and 20mm * 20mm, the spot welding central part is as the test film that has the gap.Experimental liquid consists of 20%NaCl+1%Na
2Cr
2O
7The aqueous solution, when making its boiling, the dip test sheet, observing after 120 hours has flawless.
Its result shown in table 3, the table 4.For spot corrosion indices P I more than 19 and stream rust index RI value (being RI ' value when containing Cu) in composition No1～34 more than 0, with flow the area occupation ratio that becomes rusty as the scoring of the atmospheric corrosion resistance of index all more than 4, for well.On the other hand, RI value (being RI ' value when containing Cu) be lower than 0 No35～38,40,41, and PI value be lower than among 19 the No36,39, atmospheric corrosion resistance is below 3, is the stream significant result of becoming rusty.Moreover the suitable No42 of SUS304, PI value, RI ' value all satisfy benchmark of the present invention, and atmospheric corrosion resistance is also good, but because of being that austenite structure in stress corrosion cracking is tested crackle takes place.
Table 3
Table 4
Decorate outside in material, building materials, roof Material, outdoor equipment class, water tank and hot-water cylinder, tame electrical article, bathtub, galley equipment, other indoor outer general use, become the purposes of problem with respect to outward appearance upper reaches rust, the ferrite-group stainless steel that has excellent atmospheric corrosion resistance that is formed by suitable chemical constitution can be suitable for.Especially in having the structure in gap, result from the stream rust of crevice corrosion for reduction and be particularly suitable for.It also is effective suppressing for the stream rust that is easy to generate corrosive sheared edge etc. in addition.
Claims (5)
1, a kind of ferrite-group stainless steel that has excellent atmospheric corrosion resistance, it is characterized in that: in quality % contain below the C:0.020%, below the N:0.020%, Si:0.01～1.0, Mn:0.01～0.5%, below the P:0.04%, below the S:0.01%, Cr:16.0～23.0%, Mo:0.30～3.00%, Ni:0.30～3.00%, also contain any one or two kinds of in Ti:0.05～0.25%, Nb:0.05～0.40%, surplus is Fe and unavoidable impurities, stream rust index RI satisfies following formula (A), and spot corrosion indices P I satisfies following formula (B);
RI＝Mo+LogNi≥0 (A)
PI＝Cr+3.3Mo≥19 (B)。
2, the ferrite-group stainless steel that has excellent atmospheric corrosion resistance according to claim 1 is characterized in that: also contain Cu:0.30～3.00%, and stream rust index RI ' satisfies following formula (C);
RI′＝Mo+LogNi+0.2Cu≥0(C)。
3, the ferrite-group stainless steel that has excellent atmospheric corrosion resistance according to claim 1 and 2 is characterized in that: also contain more than any one or two kinds of in A1:0.01～0.20%, B:0.0001～0.003%, V:0.03～1.0%.
4, the ferrite-group stainless steel that has excellent atmospheric corrosion resistance according to claim 1 and 2 is characterized in that: also contain any one or two kinds of in Sn:0.005～1.0%, Sb:0.005～1.0%.
5, the ferrite-group stainless steel that has excellent atmospheric corrosion resistance according to claim 1 is characterized in that: contain two kinds of elements of Nb and Ti, and (Ti+Nb)/(C+N) more than 6.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007251377 | 2007-09-27 | ||
| JP251377/2007 | 2007-09-27 | ||
| JP213400/2008 | 2008-08-22 | ||
| JP2008213400A JP2009097079A (en) | 2007-09-27 | 2008-08-22 | Ferritic stainless steel having excellent atmospheric corrosion resistance |
| PCT/JP2008/067183 WO2009041430A1 (en) | 2007-09-27 | 2008-09-24 | Ferritic stainless steel having excellent atmospheric corrosion resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101688278A true CN101688278A (en) | 2010-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880023986A Pending CN101688278A (en) | 2007-09-27 | 2008-09-24 | Ferritic stainless steel having excellent atmospheric corrosion resistance |
Country Status (4)
| Country | Link |
|---|---|
| JP (2) | JP2009097079A (en) |
| KR (1) | KR20100023022A (en) |
| CN (1) | CN101688278A (en) |
| TW (1) | TWI402358B (en) |
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| CN104769144A (en) * | 2012-10-30 | 2015-07-08 | 新日铁住金不锈钢株式会社 | Ferritic stainless steel sheet having excellent heat resistance |
| CN112639152A (en) * | 2018-08-28 | 2021-04-09 | 株式会社Posco | Ferritic stainless steel having excellent pickling characteristics |
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| JP2833042B2 (en) * | 1989-08-31 | 1998-12-09 | 大同特殊鋼株式会社 | Manufacturing method of metal expansion anchor |
| JP2642056B2 (en) * | 1994-04-22 | 1997-08-20 | 日本冶金工業株式会社 | Ferritic stainless steel for heat exchanger |
| JP3567301B2 (en) * | 1996-12-10 | 2004-09-22 | 日新製鋼株式会社 | Ferritic stainless steel sheet with excellent weather resistance and scratch resistance for shutter members |
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-
2008
- 2008-08-22 JP JP2008213400A patent/JP2009097079A/en active Pending
- 2008-09-24 CN CN200880023986A patent/CN101688278A/en active Pending
- 2008-09-24 TW TW097136653A patent/TWI402358B/en active
- 2008-09-24 KR KR1020107000170A patent/KR20100023022A/en not_active Application Discontinuation
-
2014
- 2014-01-15 JP JP2014004687A patent/JP5784763B2/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103562424A (en) * | 2011-03-09 | 2014-02-05 | 新日铁住金不锈钢株式会社 | Two-phase stainless steel exhibiting excellent corrosion resistance in weld |
| CN103562424B (en) * | 2011-03-09 | 2015-09-02 | 新日铁住金不锈钢株式会社 | The duplex stainless steel of weld part excellent corrosion resistance |
| CN104769144A (en) * | 2012-10-30 | 2015-07-08 | 新日铁住金不锈钢株式会社 | Ferritic stainless steel sheet having excellent heat resistance |
| CN112639152A (en) * | 2018-08-28 | 2021-04-09 | 株式会社Posco | Ferritic stainless steel having excellent pickling characteristics |
| CN112639152B (en) * | 2018-08-28 | 2022-07-05 | 株式会社Posco | Ferritic stainless steel having excellent pickling characteristics |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20100023022A (en) | 2010-03-03 |
| TW200927955A (en) | 2009-07-01 |
| JP5784763B2 (en) | 2015-09-24 |
| JP2014098213A (en) | 2014-05-29 |
| JP2009097079A (en) | 2009-05-07 |
| TWI402358B (en) | 2013-07-21 |
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