1271438 玖、發明說明： 【發明所屬之技術領域】 本發明係關於可得到高強度以及高疲勞特性之開關用 準安定沃斯田鐵系不鏽鋼帶。 【先前技術】 近來，隨著行動電話或個人電腦等電子機器之高密度 構，化’於該等電子儀器所使用之電子零件漸趨於小型化 薄5L化其中’對於行動電話等的行動通訊而言，彈菩 片之小型化、薄型化被極度要求。再者，不僅彈簀片構件 所受反覆負荷之應力增加’纟負荷次數亦有增大的傾向。 為了因應如此嚴格的要求，必須提昇於彈簀片所使用之金 屬材料其強度與疲勞特性。 在如上述之用途，藉由冷軋使沃斯田鐵相轉變成馬丁 體相而硬化形成準安定沃斯田鐵系不鏽鋼帶，可做為且有 尚強度與高硬度之優良彈簀材料來利用（例如 獻 1 、 2 、 3)。 (專利文獻丨）特開平10-140294號公報 (專利文獻2)特開2002-275591號公報 (專利文獻3)特開2002-146483號公報 在專利文獻卜2、3中針對疲勞特性改善方法，係揭 示了一種規定，」之方法’在加工時適度地生成馬丁體 ’而在製品中使一定程度之沃斯田鐵相殘留。所謂仙，係 表示因不同材料之化學組成而形成加工誘發馬丁體之容易 1271438 程度之值。不同文獻所使用之Md亦不同，如在專利文獻2 中，Md(N)=580-(520C+2Si+16Mn+16Cr+23Ni+300N+10Mo); 在專利文獻 3 中，Md=551 -462CC+N：)-9. 1Μη_ 29(Ni+Cu)-13·7Cr-18·5Mo 。 當Md值愈小’在變形時愈難形成加工誘發馬丁體；反 之，其值愈大則愈易形成加工誘發馬丁體。 赞明所欲解決 在專利文獻1中揭不’針對該Md與疲勞壽命之相關性 ，係藉由在疲勞測試之變形中由沃斯田鐵轉變成馬丁體之 容易程度支配著材料之疲勞特性之考察，t Md低於2()時 ’在疲勞測試之變形狀態中’將不會產生馬丁體相變.反 之’當Md值超過100時，則過早形成馬丁體，結果兩者均 無法得到良好之疲勞特性。其理由係馬丁體之 在疲勞特性初期馬丁體已成長完成之故。 然而’關於該疲勞特性，僅規定Md係不足的，尚右* 良之空間。疲勞強度原本即與強度呈正相關， $ 強度高之材料其疲勞毒会t^ ° “ 亦長。例如即使具有相同Md佶 ，亦會因加工經歷而有如值 。再者，馬丁體之4^ Κ曰有顯著變化 朽丁體之生成置亦因加工經歷而異。 本舍明之目的係藉由指標（考慮到關於疲勞 經歷)提供疲勞特性優異之準 |性之加工 天斯田鐵糸不鏽鋼帶。 【發明内容】 1271438 本發明者專心研究之結果，發現藉由規定副S與BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quasi-stabilized Vostian iron-based stainless steel belt for a switch which can obtain high strength and high fatigue characteristics. [Prior Art] Recently, with the high-density construction of electronic devices such as mobile phones and personal computers, the electronic components used in these electronic devices have become smaller and smaller. In addition, the miniaturization and thinning of the bullets are extremely demanding. Furthermore, not only the stress of the reloading load on the elastic piece member is increased, but the number of times of load dumping tends to increase. In order to meet such strict requirements, it is necessary to improve the strength and fatigue characteristics of the metal materials used in the elastic pieces. In the above-mentioned applications, the iron phase of the Vostian is transformed into a Martin phase by cold rolling to form a quasi-stable Worthite iron-based stainless steel strip, which can be used as an excellent elastic material with high strength and high hardness. Use (eg offering 1, 2, 3). (Patent Document 2) Japanese Laid-Open Patent Publication No. Hei. No. 2002-275591 (Patent Document 3). The system reveals a rule that the method "formally produces a martensite during processing" while leaving a certain degree of Worthite iron phase in the product. The so-called immortal, which means that the chemical composition of different materials is formed to the extent that the processing of the induced Martin body is easy to 1271438. Md used in different documents is also different, as in Patent Document 2, Md(N) = 580 - (520C + 2Si + 16Mn + 16Cr + 23Ni + 300N + 10Mo); In Patent Document 3, Md = 551 - 462CC +N:)-9. 1Μη_ 29(Ni+Cu)-13·7Cr-18·5Mo. The smaller the Md value is, the more difficult it is to form a process-induced martensite when deformed; on the contrary, the larger the value, the easier it is to form a process-induced martensite. It is stated in Patent Document 1 that the correlation between the Md and the fatigue life is dominated by the ease with which the Vastian iron is transformed into a Martin body in the deformation of the fatigue test. In the investigation, when t Md is lower than 2 (), 'in the deformation state of the fatigue test' will not produce a Martin body phase change. Conversely, when the Md value exceeds 100, the Martin body is formed too early, and neither of them can be obtained. Get good fatigue characteristics. The reason for this is that the Martin body has grown in the early stages of fatigue characteristics. However, regarding this fatigue characteristic, only the Md system is insufficient, and the space is still right. The fatigue strength is originally positively correlated with the strength, and the material with high strength has a fatigue toxicity of t^ ° "It is also long. For example, even if it has the same Md, it will have a value due to the processing experience. Moreover, the body of the Martin body 4^ Κ There is a significant change in the formation of 朽 体 亦 亦 亦 亦 亦 亦 亦 亦 亦 亦 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本. SUMMARY OF THE INVENTION 1271438 The inventors focused on the results of the research and found that by specifying the secondary S and
Ts/Ms之值來取代Md’可將不鏽鋼所擁有之良好疲勞特性 做最有效的發揮。 亦即， ⑴—種疲勞特性優異之準安心天斯田鐵系不鏽鋼帶， 八特徵在於·馬丁體置Ms(%)、拉伸強度TS(MPa) &及下式 所定義之MdTO係滿足TS/Ms在4〇以下且Md/Ms在〇. 16 以上， 其中，The value of Ts/Ms instead of Md' can make the most effective performance of stainless steel. That is, (1) a kind of quasi-anxious Tianstian iron-based stainless steel belt with excellent fatigue characteristics, eight features: Martin body set Ms (%), tensile strength TS (MPa) & and MdTO system defined by the following formula TS/Ms is below 4〇 and Md/Ms is above 〇. 16 or more, wherein
Md=551-462(C+N)-9.2Si-8. lMn-29(Ni+Cu)-13. 7Cr- 18.5Mo 元素之單位為質量％。 (2) —種疲勞特性優異之準安定沃斯田鐵系不鏽鋼帶， 其特徵在於：以質量比計，係含有c:〇.〇7m Si：〇.45~l.〇〇〇/0 , Μη:0. 60-1.20% , P: ^ 〇> 〇4〇% ^ s： ^ 〇.〇15%、Ni :6. 00~7· 00%、Cr :16. 〇〇〜i8.〇〇%,其餘為 Fe 與 無法避免之雜質，且TS/心在40以下、Md/Ms'在‘〇16以 上0 【實施方式】 以下說明本發明之限定理由。 (1)關於 Md/Ms 如上述雖然Md值之大小會影響疲勞特性，但加工經歷 亦會使疲勞特性產生顯著變化。在準沃斯田鐵系不鏽鋼帶 1271438 :限因加工經歷而異’再者’Ms之生成量亦 在製程中之冷加工時形成馬丁體， 使用階段之疲馨、^口 士 ％丄^ 將限制在 好之疲勞^ 生成之馬丁體量無法得到良 帶中，使2°,由在於，在準安^沃斯田鐵系不鏽鋼 ，二白奴之疲勞過程中即使不鏽鋼帶產生龜裂，在 ^裂前端發生加卫誘發馬丁體㈣，此部份硬乂 龜裂持續進行，故可延長疲勞壽命。 不易使 即使如值小，只要在製程中之冷加工時形成之馬丁體 相之：長少’則在使用階段之疲勞過程中可形成馬丁體相 可知良好之疲勞特性。另一方面，即使Μ值大，若因 ί中之々加工使知馬丁體過度成長，則在使用階段之疲 勞過程中’沒有馬丁體成長的餘地，無法得到良好之疲勞 特性。 因此，為了提昇疲勞特性，Md值必須要大，且在馬丁 體量Ms上必須保持調整空間，故提出下式之指標。Md=551-462(C+N)-9.2Si-8. lMn-29(Ni+Cu)-13. The unit of the 7Cr- 18.5Mo element is mass%. (2) A quasi-stable Worthite iron-based stainless steel belt excellent in fatigue characteristics, characterized in that it contains c: 〇.〇7m Si: 〇.45~l.〇〇〇/0 in terms of mass ratio. Μη:0. 60-1.20% , P: ^ 〇> 〇4〇% ^ s: ^ 〇.〇15%, Ni:6. 00~7· 00%, Cr:16. 〇〇~i8.〇 〇%, the rest are Fe and unavoidable impurities, and TS/heart is 40 or less, and Md/Ms' is '16 or more. 0. Embodiments The reasons for limitation of the present invention will be described below. (1) Regarding Md/Ms Although the magnitude of the Md value affects the fatigue characteristics as described above, the processing experience also causes a significant change in the fatigue characteristics. In the quasi-Worsfield iron-based stainless steel belt 1271438: limited by the processing experience, the 'recurrence' Ms is also formed in the process of cold processing during the formation of the Martin body, the use of the stage of fatigue, ^ 士士% 丄 ^ will limit In the good fatigue ^ generated by the amount of Martin can not get a good belt, so that 2 °, because in the quasi-an ^ Wostian iron-based stainless steel, two white slave fatigue process even if the stainless steel belt cracks, in ^ The crack front end is reinforced and induced by the Martin body (4). This part of the hard chop crack continues, which can prolong the fatigue life. It is not easy to make even if the value is small, as long as the formation of the Martin during the cold working in the process: the length of 'the fatigue phase during the use phase can form a good phase of the Martin body. On the other hand, even if the devaluation is large, if the processing of the 马丁 中 使 使 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁 马丁Therefore, in order to improve the fatigue characteristics, the Md value must be large, and the adjustment space must be maintained on the Martin volume Ms, so the index of the following formula is proposed.
Md/Ms ^0.16 亦即’當Ms值固定，將Md值變大；或當Md值固定， 使Ms變小，可提升疲勞特性。再者，Md因文獻而異，在 本發明中，使用專利文獻3中所使用之下式。Md/Ms ^0.16 is also 'when the Ms value is fixed, the Md value is increased; or when the Md value is fixed, the Ms is made smaller, and the fatigue characteristics can be improved. Further, since Md differs depending on the document, in the present invention, the following formula is used in Patent Document 3.
Md二551-462CC+N)-9·2Si-8.lMn-29(Ni+Cu)-13·7Cr- 18.5Mo (2)關於 Ts/Ms 另一方面’在準沃斯田鐵系不鏽鋼帶中，疲勞特性原 本即與強度有關，於某一程度之強度為止，強度愈高者疲 1271438 # 4寺性愈佳。然而’由於馬丁體之比率與強度有顯著正相 此和如述見解（若不抑制生成馬丁體相，在Ms上保持 周正工間’則無法達到良好疲勞特性）有相反的傾向。亦即 H特性之優劣也受到強度與馬丁體比率之關係（Ts/Ms) 的限制’其為本發明之目的。當Ts/Ms>40，由於加工少、 Ms值小，而強度不足，故疲勞特性差。 如上述’馬丁體之量如〇.〇25Ts$Ms$6.25Md所表示 通又’其以介於為了確保強度而達到良好之疲勞特性所必須 之馬丁體量最小值，以及在疲勞過程中未產生新的馬丁體 相而無法提昇疲勞特性之馬丁體量最大值之中間範圍較佳 〇 因此’在本發明中，規定Md/Ms-0.16且Ts/MsS40 〇 (3 )關於化學組成 所謂準安定沃斯田鐵系不鏽鋼帶，係在常溫下其組織 夭4田鐵相不女疋，藉冷軋生成加工誘發馬丁體之沃斯 田鐵系不鏽鋼帶，而以SUS3〇1、5邶3〇4為代表。 在本發明中，著眼於SUS301，其組成中c、Si、p、s 、Cr之含量以JIS規定之量作為申請專利之範圍。 另一方面，在準沃斯田鐵系不鏽鋼帶中，關於實際上 =調，=成分Ni、Μη，藉由降低其含有量，使沃斯田鐵變 得不安定，容易因加工產生相變形成馬丁體。目此，若在 疲勞初期所產生之材料表層龜裂前端部分出現相變則容易 形成馬丁體相，而新形成之馬丁體相可減低疲勞所造成之 1271438 破壞’故可改善疲勞特性。 然而，由於一但N i、Μη含右旦攸7 故必須藉加工使馬丁體量：氐’強度亦會降低’ TS/Md成為40以下的方式進^ D ’增加強度。亦即’以 到高強度且疲勞特性佳之準安二工增加馬丁體量，則可得 ，若Mn、W·夕入旦1 疋沃斯田鐵系不鏽鋼帶。惟 ^ . 1 3 ιϋ以斯明將變得十分不安定 ’且加工性變差，故關於Mn、Ni人曰+ 量為其範圍。 1…下限以m規定之 因此，TS/Ms在40以下，且M .a ^ u 且Md/Ms在〇· 16以上時， 規疋Mn、Nl之範圍分別為。，〜1肩、6.0。〜7.00%。 [實施例] 在實施例中使用之準安定沃斯田鐵系不鏽鋼帶係 SUS301。其組成成分如表1所示。將以m規定之成分範 圍利用熔解_造所得到之sus謝鍵加以㈣後，將之轨札 至板厚3_，進行溶體化處理後，反覆進行冷軋與再結晶 退火各兩次，再者，以最終壓延加卫至板厚 [表1]Md II 551-462CC+N)-9·2Si-8.lMn-29(Ni+Cu)-13·7Cr- 18.5Mo (2) About Ts/Ms On the other hand 'in the quasi-Worsfield iron-based stainless steel belt In the middle, the fatigue characteristics are originally related to the strength. Until a certain degree of strength, the higher the strength, the more tired the 1271438 # 4 temple is better. However, since the ratio and strength of the Martin body are significantly positive, as described above (if the formation of the Martin body phase is not inhibited, it is impossible to achieve good fatigue characteristics by maintaining the circumferential working space on Ms), there is a tendency to reverse. That is, the merits of the H characteristic are also limited by the relationship between the strength and the Martin body ratio (Ts/Ms), which is the object of the present invention. When Ts/Ms > 40, the processing is small, the Ms value is small, and the strength is insufficient, so the fatigue characteristics are poor. As mentioned above, the amount of the Martin body is as follows: 〇25Ts$Ms$6.25Md, which means that it has the minimum amount of Martin mass necessary to achieve good fatigue characteristics in order to ensure strength, and does not produce during fatigue. The intermediate range of the maximum body mass of the new Martin body which cannot improve the fatigue characteristics is better. Therefore, in the present invention, Md/Ms-0.16 is specified and Ts/MsS40 〇(3) is about the chemical composition so-called quasi-stable The Sita Iron-based stainless steel belt is a kind of iron-phase stainless steel belt of the Martin body which is induced by cold rolling and is processed by cold rolling, and is made of SUS3〇1,5邶3〇4. to represent. In the present invention, attention is paid to SUS301, and the content of c, Si, p, s, and Cr in the composition is within the scope of the patent application in the amount specified by JIS. On the other hand, in the quasi-Worstian iron-based stainless steel belt, the actual ==, =, Ni, Μη, by reducing the content, the Worthite iron becomes unstable, and it is easy to produce a phase change due to processing. Form the body of the Martin. Therefore, if a phase change occurs in the crack front end portion of the material generated at the initial stage of fatigue, the Martin body phase is easily formed, and the newly formed Martin body phase can reduce the fatigue damage caused by the fatigue of 12,714,38. However, since N i and Μη contain right 攸7, it is necessary to increase the strength by processing the Martin mass: 氐' intensity is also lowered, and TS/Md is 40 or less. That is to say, the increase in the volume of the Martin by the high-intensity and good fatigue characteristics of the quasi-an-2nd work can be obtained. If Mn, W, and ‧ enter the denier 1 疋 Worthfield iron-based stainless steel belt. However, ^ 1 1 ιϋ Esmin will become very unstable ‘and the workability will be worse, so the amount of Mn and Ni 曰+ is its range. 1... The lower limit is defined by m. Therefore, when TS/Ms is 40 or less, and M.a ^ u and Md/Ms are 〇·16 or more, the ranges of Mn and Nl are respectively. , ~1 shoulder, 6.0. ~7.00%. [Examples] A quasi-stable Woostfield iron-based stainless steel belt system SUS301 used in the examples. Its composition is shown in Table 1. The range of the component specified by m is obtained by the sus-bonding obtained by melting _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ , to the final calendering to the thickness of the plate [Table 1]
以質 N~^ ί>) sT— Μη ΝΪ Cu ci 組成1 O.ll 0.05 0.6 1 0.03 0.002 7.2 0.16 17 組成2 O.ll 0.06 0.6 1.5 0.03 0.002 6.7 0.16 16.9 組成3 O.ll 0.06 0.6 0.8 0.03 0.002 63 0.14 16.6 ---J 關於馬丁體量、拉伸強度與疲勞特性之評估如下述方 11 1271438 式量測。 (1 )馬丁體量 馬丁體量係利用馬丁體相為順磁性之特性（相對於沃斯 田鐵相為非磁性），藉由磁感應以肥粒體含量計（肥粒體測 量儀）來測量材料磁性之強弱，以體積率來求出成為馬丁 體相之相變量。 (2) 拉伸強度 根據在JIS Z 2201中規定之13B號將板狀試驗片穿孔 ，根據JIS Z 2241實施拉伸試驗。 _ (3) 疲勞測試 疲勞測試係根據JIS Z 2273,利用使用滑輪之極薄板 壽命試驗機，以最大負荷應力1150MPa測定在達斷裂前反 覆之耐久次數。 4 12 1271438 [表2] No 化學組成 結晶粒控1 //m 加工度 % TS MPa Ms % Md °C TS/Ms Md/Ms 斷裂前反覆次數 /次 發 1 組成1 1.2 40 1595 80.5 15.27 20 0.19 >1.0 ΧΙΟ8 明 2 2.4 55 1697 84.1 15.27 20 0.18 9.2 ΧΙΟ7 例 3 11 55 1470 43.9 15.27 33 0.35 2.7 ΧΙΟ7 4 組成2 1.4 20 1344 44.3 22.47 30 0.507 〉1·0Χ108 5 3.1 55 1569 78.8 22.47 20 0.285 7.6 ΧΙΟ7 6 16.8 55 1482 37.8 22.47 20 0.594 1.2 ΧΙΟ7 7 組成3 1 20 1457 52.3 44.43 28 0.85 >1·0Χ108 8 2.8 40 1721 96.5 44.43 18 0.46 >1·0Χ108 9 18.3 40 1588 59.5 44.43 27 0.75 L9X107 比 10 組成1 1.2 90 2142 100 15.27 21 0.15 6.1 ΧΙΟ6 較 11 2.4 5 1105 10.2 15.27 108 1.5 8.8 ΧΙΟ5 例 12 11 10 1068 7.7 15.27 139 1.98 4.1 Χ105 13 組成2 3.1 5 1036 9.8 22.47 106 2.29 7.4 ΧΙΟ5 14 16.8 10 998 7.2 22.47 139 3.12 4.9 Χ105 15 組成3 1 0 1115 0.2 44.43 5575 222 7.7 ΧΙΟ6 16 2.8 0 1052 0.1 44.43 10520 444 8.4 ΧΙΟ6 17 18.3 __ 5 1105 4.1 44.43 270 11 1.1 ΧΙΟ6 * 1最終退火之結晶粒徑 *2最終壓延加工度 表2係表示評價之結果，在發明例No. 1〜No. 9中，其 TS/Ms在40以下且Md/Ms在〇. 16以上，而未符合Ts/h 在40以下或Md/Ms在0.16以上中一者之比較例Ν〇 ι〇Composition of mass N~^ ί>) sT- Μη ΝΪ Cu ci 1 O.ll 0.05 0.6 1 0.03 0.002 7.2 0.16 17 Composition 2 O.ll 0.06 0.6 1.5 0.03 0.002 6.7 0.16 16.9 Composition 3 O.ll 0.06 0.6 0.8 0.03 0.002 63 0.14 16.6 ---J The evaluation of Martin's mass, tensile strength and fatigue characteristics is as follows: 11 1271438. (1) The Martin Mass Mathematics uses the Martinian phase as a paramagnetic property (non-magnetic compared to the Worthfield iron phase) and is measured by magnetic induction using a fat granule content meter (fertilizer granule measuring instrument). The magnetic strength of the material is determined by the volume factor to be the phase variable of the Martin phase. (2) Tensile strength A plate-shaped test piece was perforated according to No. 13B prescribed in JIS Z 2201, and a tensile test was carried out in accordance with JIS Z 2241. _ (3) Fatigue test The fatigue test is based on JIS Z 2273, using a very thin plate life tester using a pulley to measure the endurance of the pre-breaking resistance at a maximum load stress of 1150 MPa. 4 12 1271438 [Table 2] No Chemical composition Crystal grain control 1 //m Process % TS MPa Ms % Md °C TS/Ms Md/Ms Number of times before breaking/Secondary 1 Composition 1 1.2 40 1595 80.5 15.27 20 0.19 >1.0 ΧΙΟ8 Ming 2 2.4 55 1697 84.1 15.27 20 0.18 9.2 ΧΙΟ7 Example 3 11 55 1470 43.9 15.27 33 0.35 2.7 ΧΙΟ7 4 Composition 2 1.4 20 1344 44.3 22.47 30 0.507 〉1·0Χ108 5 3.1 55 1569 78.8 22.47 20 0.285 7.6 ΧΙΟ7 6 16.8 55 1482 37.8 22.47 20 0.594 1.2 ΧΙΟ7 7 Composition 3 1 20 1457 52.3 44.43 28 0.85 >1·0Χ108 8 2.8 40 1721 96.5 44.43 18 0.46 >1·0Χ108 9 18.3 40 1588 59.5 44.43 27 0.75 L9X107 is composed of 10 1 1.2 90 2142 100 15.27 21 0.15 6.1 ΧΙΟ6 vs. 11 2.4 5 1105 10.2 15.27 108 1.5 8.8 ΧΙΟ 5 Example 12 11 10 1068 7.7 15.27 139 1.98 4.1 Χ 105 13 Composition 2 3.1 5 1036 9.8 22.47 106 2.29 7.4 ΧΙΟ 5 14 16.8 10 998 7.2 22.47 139 3.12 4.9 Χ105 15 Composition 3 1 0 1115 0.2 44.43 5575 222 7.7 ΧΙΟ6 16 2.8 0 1052 0.1 44.43 10520 444 8.4 ΧΙΟ6 17 18.3 __ 5 1105 4.1 44.43 270 11 1.1 ΙΟ6*1 Crystal grain size of final annealing*2 Final calendering degree Table 2 shows the results of the evaluation. In Inventive Examples No. 1 to No. 9, the TS/Ms is 40 or less and Md/Ms is 〇. Above, but not in comparison with Ts/h below 40 or Md/Ms at 0.16 or higher Ν〇ι〇
中右比車乂相同組成之材料，則發明例較比較例可得 佳之疲勞特性。 H 13 1271438 再者’探討與疲勞特性有關之強度：雖然比較例 No. 1 〇之強度變尚’但由於Md/Ms小於〇· 16 ’亦即馬丁體 量較多’故疲勞特性差。又，在比較例No· 11〜17中，雖然 Md/Ms在0. 16以上，但由於拉伸強度低，故疲勞特性亦差 比較組成1、2與組成3，亦即比較發明例No· 1〜6與In the case where the middle right is the same composition as the rut, the inventive example can obtain better fatigue characteristics than the comparative example. H 13 1271438 Furthermore, the strength related to fatigue characteristics was investigated: although the strength of the comparative example No. 1 was changed, the fatigue property was poor because Md/Ms was smaller than 〇·16 ′, that is, the amount of the Martin was large. Further, in Comparative Examples No. 11 to 17, although Md/Ms was at least 0.16, the tensile strength was low, and the fatigue characteristics were also inferior to the compositions 1, 2 and 3, that is, the comparative invention No. 1 to 6 with
No. 7〜9、比較例No. 1〇〜14與No· 15〜17，顯示了相較於組 成1、2,組成3具較佳之疲勞特性。此乃因在組成丨中增 加Ni之添加濃度；在組成2中增加Mn之添加濃度使貼變 低之故。 [發明效果] 向強度且疲勞特性佳之 來提供一種具高強度 田鐵系不鏽鋼帶。 本發明係藉由用以得到如上述 準安定沃斯田鐵系不鏽鋼帶之指標 i疲勞特性佳之開關用準安定沃斯 【圖式簡單說明】 無No. 7 to 9, Comparative Examples No. 1 to 14 and No. 15 to 17, showing that the composition 3 has better fatigue characteristics than the compositions 1 and 2. This is because the addition concentration of Ni is increased in the composition enthalpy; the addition concentration of Mn is increased in the composition 2 to lower the sticker. [Effect of the Invention] A high-strength field iron-based stainless steel belt is provided to the strength and fatigue characteristics. The invention is obtained by using the quasi-steady Worth switch for obtaining the index of the quasi-steady Worthian iron-based stainless steel belt as described above.