CN1550566A - Metastable austenite series stainless steel band with excellent fatigue characteristics - Google Patents

Metastable austenite series stainless steel band with excellent fatigue characteristics Download PDF

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Publication number
CN1550566A
CN1550566A CNA2004100433837A CN200410043383A CN1550566A CN 1550566 A CN1550566 A CN 1550566A CN A2004100433837 A CNA2004100433837 A CN A2004100433837A CN 200410043383 A CN200410043383 A CN 200410043383A CN 1550566 A CN1550566 A CN 1550566A
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Prior art keywords
stainless steel
fatigue
steel band
fatigue characteristic
fatigue characteristics
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CNA2004100433837A
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Chinese (zh)
Inventor
黑崎郁也
彦
深町一彦
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Nippon Mining Holdings Inc
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Nippon Mining Co Ltd
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Publication of CN1550566A publication Critical patent/CN1550566A/en
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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
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2202/00—Physical properties

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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 Sheet Steel (AREA)

Abstract

The invention provides a metastable austenitic stainless steel strip that is excellent in fatigue property by an index considering working history on the fatigue property. In a Md(deg.C) acquired by an amount of martensite(Ms(%)), tensile strength(TS(MPa)) and the following equation: Md=551-462(C+N)-9.2Si-8.1Mn-29(Ni+Cu)-13.7Cr-18.5Mo, where a unit of elements is mass%, the metastable austenitic stainless steel strip outstanding in fatigue property is distinctive in that TS/Ms is 40 or less, and Md/Ms is 0.16 or more.

Description

The meta austenite stainless steel band of excellent in fatigue characteristics
Technical field
The present invention relates to require the switch meta austenite stainless steel band of high strength and high fatigue characteristic.
Background technology
In recent years, aspect e-machines such as portable phone and Personal Computer, the high-density mounting propelling for this reason, about the employed electronic unit of these e-machines, is being carried out the miniaturization attenuateization.Wherein, the miniaturization attenuateization of strong request such as portable phone, mobile communicating stage clip.And not only repeated loading increases in the stress of stage clip member, and the tendency that exists its load number of times also to increase.In order to adapt to the requirement of such strictness, need improve intensity and improve fatigue characteristic for the metallic substance that is used for stage clip.
In such purposes, be phase-changed into martensitic phase mutually and hardened meta austenite stainless steel by the cold rolling austenite that makes, be utilized as fine spring material (for example with reference to patent documentation 1,2,3) with high intensity and hardness.
[patent documentation 1] spy opens flat 10-140294 communique
[patent documentation 2] spy opens the 2002-275591 communique
[patent documentation 3] spy opens the 2002-146483 communique
In patent documentation 1,2,3, the method as improving fatigue characteristic discloses: regulation " Md " makes it moderately to generate martensite the method for remaining to a certain degree austenite phase in goods man-hour adding.So-called Md is that expression is formed the value that martensitic generation easness is brought out in the processing that draws by materials chemistry.Md is different and different according to document, for example in patent documentation 2, use Md (N)=580-(520C+2Si+16Mn+16Cr+23Ni+300N+10Mo), in patent documentation 3, use Md=551-462 (C+N)-9.2Si-8.1Mn-29 (Ni+Cu)-13.7Cr-18.5Mo.
Md means: if little, then martensite is brought out in difficult formation processing when distortion, on the contrary, if value is big, then forms easily.
In patent documentation 1, putting down in writing: about the dependency of this Md and fatigue lifetime, according to this investigation of fatigue characteristic from austenite to the easy generation degree of martensitic transformation that arrange material in the distortion in fatigue test from, when Md less than 20 the time, martensitic transformation does not take place in the distortion in fatigue test, on the contrary, Md surpasses for 100 the martensitic formation of occasion morning, therefore can not get sufficient fatigue characteristic respectively.This reason can think because, martensitic formations morning, the cause of growing up at the initial stage of fatigue test martensite.
,, only stipulate that this Md is insufficient, also have the leeway of improvement about fatigue test.Fatigue characteristic have positive dependency with intensity after all, and the material fatigue life that common intensity is high is also long.For example, even have same Md value, also different according to processing experience varying strength, fatigue characteristic change greatly.In addition, the generation of martensite volume is also different and different according to the processing experience.
Summary of the invention
The object of the invention is, according to about the consideration of fatigue characteristic the index of processing experience, the meta austenite stainless steel band of excellent in fatigue characteristics is provided.
What the inventor studied with keen determination found that, by replacing the value of Md regulation Md/Ms, TS/Ms, can bring into play the good fatigue characteristic that stainless steel has to greatest extent.
Promptly, (1) a kind of meta austenite stainless steel band of excellent in fatigue characteristics, it is characterized in that, martensite volume Ms (%), tensile strength TS (MPa) and the Md that provides by following formula (℃) aspect, TS/Ms is decided to be below 40 and with Md/Ms is decided to be more than 0.16, wherein, Md-551-462 (C+N)-9.2Si-8.1Mn-29 (Ni+Cu)-13.7Cr-18.5Mo, the unit of element is quality %.
(2) a kind of meta austenite stainless steel band of excellent in fatigue characteristics, it is characterized in that, by quality %, by C:0.07-0.15%, Si:0.45-1.00%, Mn:0.60-1.20%, P: S≤0.040% :≤0.015%, the Fe of Ni:6.00-7.00%, Cr:16.00-18.00%, surplus and unavoidable impurities are formed, and TS/Ms are decided to be below 40 and with Md/Ms be decided to be more than 0.16.
The embodiment of invention
Qualification reason of the present invention below is described.
(1) about Md/Ms
According to above-mentioned, the size of Md value has influence on fatigue characteristic, but also changes greatly according to processing experience different fatigue characteristic.For the meta austenite stainless steel, martensite volume Ms is different because of the processing experience, and again, the generating capacity of Ms is limited.When the cold working martensite of production process is grown up, de novo martensite volume is limited in the fatigue process of operational phase, can not get good fatigue characteristic.This reason be because, processing in the fatigue process of operational phase, even Stainless Steel Band chaps, also takes place at the be full of cracks tip and brings out martensitic transformation in the occasion of meta austenite stainless steel, that part of sclerosis, be full of cracks is difficult to be expanded, so fatigue lifetime is elongated.
Even the occasion that Md is little, if growing up of the cold working martensitic phase by manufacturing process is few, then the martensitic phase in the fatigue process of operational phase grow up into possibility, also obtain good fatigue characteristic.On the other hand, even the big occasion of Md, when too growing up by the cold working martensite of manufacturing process, martensitic growing up new in the fatigue process of operational phase do not have enough and to spare, can not get good fatigue characteristic yet.
Therefore, in order to improve fatigue characteristic, must Md big, martensite volume Ms has enough and to spare, has proposed the index of following formula.
Md/Ms≥0.16
That is,,, perhaps,,, can improve fatigue characteristic by reducing Ms with respect to certain Md by increasing Md with respect to certain Ms.Moreover Md is different because of document, uses the following formula that uses in patent documentation 3 in the present invention.
Md＝551-462(C+N)-9.2Si-8.1Mn-29(Ni+Cu)-13.7Cr-18.5Mo。
(2) about TS/Ms
On the other hand, for inferior austenite stainless steel, fatigue characteristic have correlationship with intensity after all, before the intensity that reaches to a certain degree, and material of excellent fatigue characteristics when intensity is high., because the positive correlationship of intensive arranged on martensite ratio and intensity, if therefore be and suppress above-mentioned martensitic phase and take place, and Ms do not have enough and to spare, then the bad opposite tendency of opinion of fatigue characteristic.That is to say that the quality of fatigue characteristic is also restricted by the relation (TS/Ms) of intensity and martensite ratio.This is the intent of the present invention place.When TS/Ms＞40, because processing is few, Ms is little, and intensity is insufficient, so fatigue characteristic are poor.
As known from the above, martensite volume as representing with 0.025TS≤Ms≤6.25Md, in order to ensure intensity, obtain good fatigue characteristic and the minimum value of essential martensite volume and the peaked intermediate range of the martensite volume of growing up, can not improve fatigue characteristic that in fatigue process, do not have a new martensitic phase for good.
Therefore, the present invention stipulates Md/Ms 〉=0.16 and TS/Ms≤40.
(3) about chemical constitution
The meta austenite stainless steel, be organize at normal temperatures austenite unstable mutually, by cold rolling generates to process bring out martensitic austenite stainless steel, as its representational stainless steel SUS301, SUS304 are arranged.
The present invention is conceived to SUS301, and in it was formed, the content of C, Si, P, S, Cr was protection domain with the amount of JIS defined.
On the other hand, for inferior austenite stainless steel, about adjustable in fact composition Ni, Mn, by reducing its content, the martensitic transformation that processing causes takes place in austenite instabilityization easily.Therefore, when the be full of cracks tip portion distortion of the material surface that takes place at the tired initial stage, martensitic phase takes place easily, the destruction that being difficult to of new martensitic phase causes that fatigue causes, and improve fatigue characteristic.
, when reducing Ni, Mn content, because intensity also reduces, therefore being necessary increases the martensite volume that is produced by processing, gains in strength.That is to say, be that mode below 40 increases martensite volume by processing by TS/Ms, obtains the meta austenite stainless steel of high strength, material of excellent fatigue characteristics in view of the above.But when too reducing Mn, Ni content, austenite is very unstable, and processibility degenerates, and therefore about lower limit, is scope with the amount of JIS defined.
Therefore, be below 40 with TS/Ms and Md/Ms is that Mn, Ni scope in more than 0.16 is decided to be 0.60-1.20%, 6.00-7.00%.
Embodiment
The meta austenite stainless steel that is used for embodiment is SUS301.Its one-tenth is grouped into and is shown in table 1.Forging is behind the SUS301 ingot that obtains by the fusion casting under the composition range of stipulating based on JIS, and hot rolling after the solution treatment, is carried out 2 cold rolling and recrystallization annealing to thickness of slab 3mm respectively repeatedly, again through finish to gauge, is worked into thickness of slab 0.1mm.
Table 1
Chemical constitution (quality %)
?C ?N ?Si ?Mn ?P ?S ?Ni ?Cu ?Cr
Form 1 ?0.11 ?0.05 ?0.6 ?1 ?0.03 ?0.002 ?7.2 ?0.16 ?17
Form 2 ?0.11 ?0.06 ?0.6 ?1.5 ?0.03 ?0.002 ?6.7 ?0.16 ?16.9
Form 3 ?0.11 ?0.06 ?0.6 ?0.8 ?0.03 ?0.002 ?6.3 ?0.14 ?16.6
Evaluation about martensite volume, tensile strength and fatigue characteristic is measured as described below.
(1) martensite volume
Austenite is non magnetic, relative therewith mutually, and martensitic phase is a paramagnetism, and martensite volume adopts magneticinduction ferrite content meter (ferrite instrument) to measure the intensity of the magnetic of material by utilizing this situation, obtains amount to the martensitic phase phase transformation by volume fraction in view of the above.
(2) tensile strength
Die-cut 13B number tabular test film according to regulation among the JIS Z 2201, the tension test of implementation basis JISZ 2241 standards.
(3) fatigue characteristic
Fatigue characteristic are used the ultra-thin plate life test machine that has adopted belt pulley according to JIS Z 2273 standards, have measured up to the cycling durable number of times that ruptures by overall loading stress 1150MPa.
Table 2
????No. Chemical constitution Crystal particle diameter *1????μm Degree of finish *2????％ ????TS ????MPa ??Ms ??％ ??Md ??℃ ????TS/Ms ????Md/Ms Cycle index up to fracture is inferior
Example ????1 Form 1 ????1.2 ????40 ????1595 ??80.5 ??15.27 ????20 ????0.19 ????＞1.0×10 8
????2 ????2.4 ????55 ????1697 ??84.1 ??15.27 ????20 ????0.18 ????9.2×10 7
????3 ????11 ????55 ????1470 ??43.9 ??15.27 ????33 ????0.35 ????2.7×10 7
????4 Form 2 ????1.4 ????20 ????1344 ??44.3 ??22.47 ????30 ????0.507 ????＞1.0×10 8
????5 ????3.1 ????55 ????1569 ??78.8 ??22.47 ????20 ????0.285 ????7.6×10 7
????6 ????16.8 ????55 ????1482 ??37.8 ??22.47 ????20 ????0.594 ????1.2×10 7
????7 Form 3 ????1 ????20 ????1457 ??52.3 ??44.43 ????28 ????0.85 ????＞1.0×10 8
????8 ????2.8 ????40 ????1721 ??96.5 ??44.43 ????18 ????0.46 ????＞1.0×10 8
????9 ????18.3 ????40 ????1588 ??59.5 ??44.43 ????27 ????0.75 ????1.9×10 7
Comparative example ????10 Form 1 ????1.2 ????90 ????2142 ??100 ??15.27 ????21 ????0.15 ????6.1×10 6
????11 ????2.4 ????5 ????1105 ??10.2 ??15.27 ????108 ????1.5 ????8.8×10 5
????12 ????11 ????10 ????1068 ??7.7 ??15.27 ????139 ????1.98 ????4.1×10 5
????13 Form 2 ????3.1 ????5 ????1036 ??9.8 ??22.47 ????106 ????2.29 ????7.4×10 5
????14 ????16.8 ????10 ????998 ??7.2 ??22.47 ????139 ????3.12 ????4.9×10 5
????15 Form 3 ????1 ????0 ????1115 ??0.2 ??44.43 ????5575 ????222 ????7.7×10 6
????16 ????2.8 ????0 ????1052 ??0.1 ??44.43 ????10520 ????444 ????8.4×10 6
????17 ????18.3 ????5 ????1105 ??4.1 ??44.43 ????270 ????11 ????1.1×10 6
* 1 crystal particle diameter under final annealing; * 2 finish to gauge degree of finish
Table 2 illustrates the result of evaluation, it is below 40 that example No.1-No.9 satisfies TS/Ms and Md/Ms is more than 0.16, for not satisfy TS/Ms be below 40 or Md/Ms is some comparative example No.10-17 more than 0.16, when comparing the material of same composition, a side of example obtains the fatigue characteristic better than comparative example.
In addition, be conceived to the intensity related with fatigue characteristic, the intensity height of comparative example No.10, but Md/Ms that is to say that martensite volume is many, so fatigue characteristic is poor less than 0.16.Again, the Md/Ms of comparative example No.11-17 is more than 0.16, but tensile strength is low, so fatigue characteristic are still poor.
Relatively form 1,2 and form 3,, form 3 one sides and demonstrate the fatigue characteristic tendencies better than composition 1,2 by relatively example No.1-6 and No.7-9, comparative example No.10-14 and No.15-17.This is because increase by the interpolation concentration of forming Mn in Ni in 1, the composition 2, in view of the above the cause of Md reduction.
The invention effect
As described above, according to being the index of stainless steel band for the metastable austenite that obtains material of excellent fatigue characteristics, it is stainless steel with metastable austenite that the switch that requires high strength and fatigue properties can be provided.

Claims (2)

1. the meta austenite stainless steel band of an excellent in fatigue characteristics, it is characterized in that, martensite volume Ms (%), tensile strength TS (MPa) and the Md that provides by following formula (℃) aspect, TS/Ms is decided to be below 40 and with Md/Ms is decided to be more than 0.16, wherein, Md=551-462 (C+N)-9.2Si-8.1Mn-29 (Ni+Cu)-13.7Cr-18.5Mo, the unit of element is quality %.
2. the meta austenite stainless steel band of an excellent in fatigue characteristics, it is characterized in that, by quality %, by C:0.07-0.15%, Si:0.45-1.00%, Mn:0.60-1.20%, P: S≤0.040% :≤0.015%, the Fe of Ni:6.00-7.00%, Cr:16.00-18.00%, surplus and unavoidable impurities are formed, and TS/Ms are decided to be below 40 and with Md/Ms be decided to be more than 0.16.
CNA2004100433837A 2003-05-09 2004-05-09 Metastable austenite series stainless steel band with excellent fatigue characteristics Pending CN1550566A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101545078B (en) * 2008-03-24 2011-06-15 宝山钢铁股份有限公司 Nickel saving type metastable austenite stainless steel with excellent normal temperature mechanical property
CN109295379A (en) * 2017-07-24 2019-02-01 宜兴市零零七机械科技有限公司 A kind of bobbin-winding machine machinery anti-patterning device pressure spring material
CN111247265A (en) * 2017-08-21 2020-06-05 株式会社Posco Austenitic stainless steel having excellent workability and season cracking resistance, and drawn product using same
JP2022514678A (en) * 2018-12-18 2022-02-14 ポスコ High strength stainless steel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200942628A (en) * 2008-04-08 2009-10-16 Walsin Lihwa Corp Low nickel austenitic stainless steel with low magnetism, corrosion resistance and easy-to-process
TW201825688A (en) * 2016-01-14 2018-07-16 美商Ａｋ鋼鐵資產公司 Warm rolling of steels containing metastable austenite
JP6560427B1 (en) * 2018-11-29 2019-08-14 株式会社特殊金属エクセル Stainless steel strip or stainless steel foil and method for producing the same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4489928B2 (en) * 2000-11-09 2010-06-23 新日鐵住金ステンレス株式会社 High strength austenitic stainless steel wire

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101545078B (en) * 2008-03-24 2011-06-15 宝山钢铁股份有限公司 Nickel saving type metastable austenite stainless steel with excellent normal temperature mechanical property
CN109295379A (en) * 2017-07-24 2019-02-01 宜兴市零零七机械科技有限公司 A kind of bobbin-winding machine machinery anti-patterning device pressure spring material
CN111247265A (en) * 2017-08-21 2020-06-05 株式会社Posco Austenitic stainless steel having excellent workability and season cracking resistance, and drawn product using same
JP2022514678A (en) * 2018-12-18 2022-02-14 ポスコ High strength stainless steel
JP7108143B2 (en) 2018-12-18 2022-07-27 ポスコ high strength stainless steel

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KR100622887B1 (en) 2006-09-19
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TWI271438B (en) 2007-01-21

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