TW200521251A

TW200521251A - Austenitic high Mn stainless steel excellent in workability

Info

Publication number: TW200521251A
Application number: TW093133455A
Authority: TW
Inventors: Masaharu Hatano; Eiichiro Ishimaru; Akihiko Takahashi
Original assignee: Nippon Steel & Sumikin Sst
Priority date: 2003-11-07
Filing date: 2004-11-03
Publication date: 2005-07-01
Also published as: KR101177540B1; JP4498847B2; TWI268960B; KR20060099388A; JP2005154890A; WO2005045082A1

Abstract

The present invention provides a high Mn stainless steel having an improved workability, and has as its object the provision of an austenitic stainless steel provided with a workability equal to or better than SUS304 and kept nonmagnetic even after working by designing the ingredients so that the C+N, indicator Md30 value (DEG C) of austenite stability, and indicator of production of stacking fault energy SFE (mJ/m<SP>2</SP>) satisfy specific conditions, comprised of, by wt%, C+N: 0.03 to 0.15%, Si: 0.1 to 1%, Mn: 3 to 15%, Cr: 10 to 16%, Ni: 1 to 6%, Cu: 0.3 to 3%, Mo: 0.3 to 3%, and the balance Fe and unavoidable impurities, the ingredients being designed so that the indicator Md30 value of austenite stability and the indicator of production of stacking fault energy SFE satisfy the following.

Description

200521251 九、發明說明：【考务明所屬支4标領j 技術領域本發明係有關於一種軟質且加工硬化性小，並且具有可以高加工率進行冷加工或拉伸加工等加壓成形之優異之加工性，且於加工後仍維持非磁性之沃斯田系高Μη不銹鋼。 L· mr 背景技術沃斯田系不銹鋼有JISG4305規定之300系(SUS304、SIS316、 SUS；301 等)或2〇〇系(SUS^、SUS2〇2 等)者。 300系之沃斯田系不銹鋼中，含有2·〇質量％以下2Mn，6〜15 質量％左右之Ni。代表SUS304之Ni系之沃斯田系不銹鋼，具有良好之加工性且亦具有優異之耐腐餘性，然而由於含有大量昂貴之 Ni所以有原料成本南之缺點。又，SUS304由於沃斯田鐵相為介穩定，因此亦有於成形加工中產生麻田散鐵變態，加工品帶有磁性之問題。另外’ 200糸之沃斯田鐵糸不錢鋼，係以Mn替換见之高Mn 不銹鋼，且由於含有大量(^或^^，因此強度高且為非磁性。又，比200521251 IX. Description of the invention: [Kao Wuming's branch 4 collars j. TECHNICAL FIELD The present invention relates to a kind of soft and low work hardening, and has excellent pressure forming such as cold working or drawing processing with high processing rate. Wasfield-based high Mη stainless steel that is processable and maintains non-magnetic properties after processing. L · mr Background technology Vossian stainless steel includes 300 series (SUS304, SIS316, SUS; 301, etc.) or 200 series (SUS ^, SUS202, etc.) specified in JISG4305. The 300 series Vostian stainless steel contains 2Mn or less of 2Mn and about 6 to 15 mass% of Ni. The Vostian stainless steel, which represents the SUS304 Ni series, has good processability and excellent corrosion resistance. However, because it contains a large amount of expensive Ni, it has the disadvantage of low raw material costs. In addition, SUS304 has a problem that the Asada iron phase is stable, so there is a problem that the Asada loose iron is deformed during the forming process, and the processed product has magnetic properties. In addition, ’200 糸 of Woustian Iron 糸 is a high-Mn stainless steel replaced by Mn, and because it contains a large amount of (^ or ^^, it is high in strength and non-magnetic. Also,

Ni系之沃斯田系不銹鋼便宜。然而，代表SUS2〇1或SUS2〇2等之高Μη不銹鋼，由於在退火狀態中與3〇〇系比較下強度更高且加工硬化性更大，因而有冷加工或深拉伸加工等加壓成形性不佳之問題0 有關改善沃斯田系不銹鋼之加工性之手段，迄今已針對含有少於3%之Μη、6%以上之沖之3〇〇系作了大量檢討。例如於專利 200521251 公報第3039838號、專利公報第挪咖號、專利公報第侧細號、專利公開公報10-102210號及專利公開公報1(M212〇7號中，揭示了添加Cu可有效地改善加遷成形性等加工性。另外，含有5.5%以下之Ni、5 5%以上之碰之2〇〇系之沃斯田鐵系不銹鋼主要適·電子機器職轉姆料、自行車輻條用鋼線、建築、建材用釘等要求高強度非雜之構件。因此，已有很多關於再提昇高Μη不銹鋼之高強度非磁化之檢討。例如，專利公報第2618151號，日本專利公開公報第6_235⑽號巾揭示了配合高氮化抑制Μη或Cr之增加並添加些許灿、Μ〇、ρ，可有效地提昇高強度、非磁性化。曰本專利公開公報Π-92885號、日本專利公開公報 2〇〇〇-34546號等中揭示了減少Ca、Β、s之不純物元素，可有效改善低Ni沃斯田系不銹鋼之耐腐蝕性。該等低Μ沃斯田系不銹鋼含有起過0·1%之大塁之N ’且強度(〇·2%财力)與前述高施不銹鋼一樣高，於加工性方面會有問題。另外，日本專利公開公報期4-143576號、英國專利公報第说娜號中揭示了為了於财腐蝕性以外進一步改善加工性而降低Cr量之低Ni沃斯田系不銹鋼’其機械性質較接近SUS3〇4。該等低Ni沃斯田系不銹鋼為了確保熱加工，對沃斯田鐵安定度進行調整以抑制於高溫下之肥粒鐵生成，然而對於室溫下之沃斯田鐵安定度卻完全沒有作檢討。即，該等低Ni沃斯田系不銹鋼會因加壓成形等冷加工生成加工誘發麻田散鐵，有其加王品帶有磁性，或產生自然破裂問題之虞。如前述，已降低Ni量之高Μη不銹鋼並沒有在加工性方面有所改善以適合應用在使用代表SUS304之Ni系之不銹鋼之加壓成 200521251 形用途等。即，迄今尚未出現具有與SUS304同等級以上之優異加工性，且於加工後仍可實現非磁化之高Μη不銹鋼。 I：發明内容3 發明概要本發明係為了改善前述高Μη不銹鋼之加工性而研究出者，目的在於提供一種措進行成分設計使C + Ν、沃斯田鐵安定度之指標Md30值(°〇、疊差能之生成指標SFE(mJ/m2)滿足特定條件，而具備與SUS304同程度以上之加工性，且於加工後仍可維持非磁性之沃斯田糸不錄鋼。本明之要旨如下。 (1) 一種加工性優異之沃斯田系高Μη不銹鋼，以質量％計，係由以下之成分構成：C + N : 0.03〜0.15%，Si : 0.1〜1%，Μη : 3〜15% ’ Cr : 10〜16%，Ni: 1 〜6%，Cu : 0.3〜3%，及Mo : 0.3〜3%，且其餘部份由Fe和不可避免之雜質構成，又，沃斯田鐵安定度之指標Md30值與疊差能之生成指標SFE滿足下述條件·· -10<Md30<30、40<SFE<80The Vosda stainless steel of the Ni series is cheap. However, high Mn stainless steels, such as SUS2001 and SUS200, have higher strength and work hardenability when compared with the 300 series in the annealed state, and therefore have cold forming or deep drawing processing. Poor Sexual Problems 0 Regarding the means for improving the workability of Vossian stainless steels, a large number of reviews have been conducted so far on 300 series containing less than 3% Mn and more than 6% impulse. For example, in Patent 200521251 Gazette No. 3039838, Patent Gazette No. 30, Patent Gazette No., Patent Gazette No. 10-102210, and Patent Gazette No. 1 (M212〇7), it is disclosed that the addition of Cu can effectively improve Addition of formability such as formability. In addition, 200-series Vostian iron-based stainless steel containing 5.5% or less of Ni and 55% or more of contact is mainly suitable for electronic materials, steel wire for bicycle spokes, etc. , Construction, building materials, nails, etc., which require high strength and non-heterogeneous components. Therefore, there have been many reviews on further enhancing the high strength non-magnetization of high Mn stainless steel. For example, Patent Gazette No. 2618151, Japanese Patent Publication Gazette No. 6_235⑽ It was revealed that high nitridation can be used to suppress the increase of Mn or Cr, and the addition of a small amount of Can, Mo, and ρ can effectively enhance high strength and non-magnetization. Japanese Patent Publication No. Π-92885, Japanese Patent Publication No. 200 〇-34546 disclosed that reducing the impurity elements of Ca, B, and s can effectively improve the corrosion resistance of low Ni Voss field stainless steels. These low M Voss field stainless steels contain Big N ′ and the strength (0.2% financial strength) is as high as the aforementioned high-applied stainless steel, and there is a problem in workability. In addition, Japanese Patent Publication No. 4-143576 and British Patent Gazette No. In order to further improve the workability in addition to corrosive properties, low Ni Vossfield stainless steels' mechanical properties are closer to SUS304. In order to ensure hot work, these low Ni Vossian stainless steels are The iron stability is adjusted to suppress the formation of ferrous iron at high temperatures, but the Vostian iron stability at room temperature has not been reviewed at all. That is, these low-Ni Vostian stainless steels will be formed by pressure. Iso-cold processing can induce processing of Asada scattered iron, which may cause magnetic problems or natural cracking problems. As mentioned above, the high Mn stainless steel that has reduced the amount of Ni has not improved in terms of workability and is suitable for application in Pressing using Ni-based stainless steel representing SUS304 to form 200521251, etc. That is, it has not yet appeared that it has excellent processability above the same level as SUS304, and non-magnetization can still be achieved after processing. High Mn stainless steel. I: Summary of the invention 3. Summary of the invention The present invention was developed to improve the workability of the aforementioned high Mn stainless steel, and the object is to provide an index for designing the composition so that C + Ν and Vostian iron stability. Md30 value (° 〇, stacking energy generation index SFE (mJ / m2) meets specific conditions, and has the same degree of processability as SUS304, and can maintain non-magnetic Vossfield non-recording steel after processing The main points of the present invention are as follows: (1) A Vostian high Mη stainless steel with excellent processability, which is composed of the following components in terms of mass%: C + N: 0.03 to 0.15%, Si: 0.1 to 1%, Μη: 3 ~ 15% 'Cr: 10 ~ 16%, Ni: 1 ~ 6%, Cu: 0.3 ~ 3%, and Mo: 0.3 ~ 3%, and the rest is composed of Fe and inevitable impurities, and , Vostfield iron stability index Md30 value and superimposed energy generation index SFE meet the following conditions -10 < Md30 < 30, 40 < SFE < 80

Md30(°C) ： 497-462(C + N)-9.2Si-8.1Mn-13.7Cr-20(Ni + Cu)-18.5Mo SFE(mJ/m2) : 6.2Ni+18.6Cu + 0.7Cr+3.2Mn + 9.3Mo —53。 (2) 該高Μη不銹鋼為了改善熱加工或耐氧化性，以質量％計’可更含有0.001〜〇.2%REM。 (3) 為了確保可以高加工率進行冷加工或深拉伸加工等加壓成形之加工性，C + N為0.15質量％以下，拉伸試驗所求出之〇.2% 对力小於300MPa，於真應力-對數延伸應變線上公稱應變25%與 35%之等級之加工硬化指數11為〇 3〇〜〇45。又，壓軋率6〇%冷壓時 200521251 之磁導率(μ)為1·〇5以下時，即使於各種加工後仍可維持非磁性。如前述，由於本發明之高Μη不銹鋼採用C + N:0.03〜0.15%、 —10<Md30<30、40<SFE<80之成分設計，因此，0.2%耐力小於300MPa，為軟質，並且加工硬化性小，具有可以高加工率進行冷加工或伸拉伸加工等加壓成形之優異加工性，即使於加工後仍可維持非磁性。因此，可實現習知之高Mnf銹鋼無法進行之成形加工，可應用在使用代表SUS之Ni系不銹鋼之加壓成形用途上。且，由於亦可省略SUS304加工後之用以非磁性化之退火，因此，可廣泛地應用於要求非磁性之成形加工用之材料之領域。圖式簡單說明弟1圖係顯示Md30值對鋼材之伸長率之影響之圖表。第2圖係顯示Md30值對60%冷壓軋材之磁導率之影響之圖表0 第3圖係顯示SFE與加工硬化指數n之關係之圖表。 C實施方式3 較佳實施例之詳細說明本發明之高Μη不銹鋼藉採用使C + N、沃斯田鐵安定度之指標Md30值(。〇、及疊差能之生成指標SFE(mJ/m2)滿足適當範圍之成分設計，具備與SUS304同程度以上之加工性，且於加工後仍可維持非磁性。以下，說明與本發日月之高施不銹鋼之成分設計有關之作用效果與其限定理由。 • C + N : 0.15%以下 C或N係有助於沃斯田鐵相之安定化或抑制5肥粒鐵相之生成之元素。另外，該等元素藉強化會提昇鋼材之α2%耐力並 200521251 降低加工性。因此，C + Ν之上限為0.15%。由於N較C更可提升 0.2%耐力，因此最好設計成n少於C。本發明藉將C + N設計成 0.15%以下(N<C)，可使鋼材之〇·2%耐力小於3〇〇MPa為軟質化，可使用在要求以高加功率進行冷加工或深拉伸加工等加壓成形之用途上。然而，C + N小於0.03%時，不僅加工品不易非磁性化，還會為了減少C或N，增加製鋼成本。因此，c+N之下限為〇·〇3%。較佳之範圍為0.08〜0.12%。 •沃斯田鐵安定度之指標：Md3〇值(。〇介穩定沃斯田鐵不銹鋼即使於Ms點以上之溫度亦會因塑性加工引發麻田散鐵變態。因加工產生變態點之上限溫度稱作以^ 值。即，Md值係顯示沃斯田鐵之安定度之指標。且，將藉拉伸變形給予30%之變形時產生5〇%之麻田散鐵之溫度稱為遍3〇值。本發明之高Μη不銹鋼藉由將定義為_30=497一462((：： + 1^ —9.2Si —8.1Mn-13.7Cr-20(Ni + Cu)—18·5Μο 之 Md30 值(。〇設。十在10C〜30C之範圍，確保本發明之目的之加工性與非磁性。Md30 (° C): 497-462 (C + N) -9.2Si-8.1Mn-13.7Cr-20 (Ni + Cu) -18.5Mo SFE (mJ / m2): 6.2Ni + 18.6Cu + 0.7Cr + 3.2 Mn + 9.3Mo —53. (2) In order to improve hot working or oxidation resistance, the high Mη stainless steel may further contain 0.001 to 0.2% REM in mass%. (3) In order to ensure the workability of press forming such as cold working or deep drawing processing at a high processing rate, C + N is 0.15% by mass or less, and the 0.2% counter force obtained by the tensile test is less than 300MPa. The work hardening index 11 on the true stress-logarithmic extension strain line with a nominal strain of 25% and 35% is 0.300 to 0.45. In addition, when the rolling reduction is 60% and the cold-rolled magnetic permeability (μ) of 200521251 is 1.05 or less, non-magnetic properties can be maintained even after various processing. As mentioned above, since the high Mn stainless steel of the present invention uses a composition design of C + N: 0.03 to 0.15%, -10 < Md30 < 30, 40 < SFE < 80, 0.2% resistance is less than 300MPa, is soft, and is work hardened It has small properties, and has excellent processability such as cold working or stretch forming with high processing rate, and can maintain non-magnetic even after processing. Therefore, the conventional high-Mnf rust steel can be formed, and it can be used for pressure forming applications using Ni-based stainless steel, which is SUS. In addition, since the annealing for non-magnetization after the processing of SUS304 can also be omitted, it can be widely used in the field of materials that require non-magnetic forming processing. Brief Description of Drawings The figure 1 is a graph showing the effect of Md30 value on the elongation of steel. Figure 2 is a graph showing the effect of Md30 value on the magnetic permeability of a 60% cold rolled material. Table 0 Figure 3 is a graph showing the relationship between SFE and work hardening index n. C Embodiment 3 Detailed description of the preferred embodiment The high Mη stainless steel of the present invention adopts the index Md30 value (.0) of C + N, Vostian iron stability, and the generation index SFE (mJ / m2) of stacking energy. ) A composition design that satisfies an appropriate range, has the same degree of processability as SUS304, and can maintain non-magnetic after processing. The following explains the effect and the reasons for the limitation of the composition design of Gaoshi Stainless Steel • C + N: 0.15% or less C or N is an element that contributes to the stabilization of the iron phase of Vostian or inhibits the formation of 5 ferrite grain phases. In addition, strengthening these elements will increase the steel's α2% endurance And 200521251 reduces workability. Therefore, the upper limit of C + Ν is 0.15%. Since N can increase the endurance by 0.2% compared to C, it is best to design n to be less than C. The present invention designs C + N to be less than 0.15%. (N < C) can soften the 0.2% endurance of steel materials to less than 300 MPa, and can be used for applications that require press forming such as cold working or deep drawing processing with high power. However, C + N is less than 0.03%. In order to reduce C or N, increase the cost of steelmaking. Therefore, the lower limit of c + N is 0.03%. The preferred range is 0.08 ~ 0.12%. • Vostfield iron stability index: Md30 value (.〇介) Stable Vosstian iron stainless steel even if the temperature is above the Ms point, it will lead to the transformation of Asada scattered iron due to plastic processing. The upper limit temperature of the transformation point due to processing is called ^ value. That is, the Md value shows the stability of Vostian iron In addition, the temperature at which 50% of the Asada scattered iron is generated when 30% of the deformation is given by tensile deformation is referred to as the 30 value. The high Mn stainless steel of the present invention is defined as _30 = 497 462 ((:: + 1 ^ —9.2Si —8.1Mn-13.7Cr-20 (Ni + Cu) —18 · 5Mο Md30 value (. 0 set. Ten in the range of 10C ~ 30C, to ensure the purpose of the present invention Processability and non-magnetic.

Md值小於_1(rc時，由於沃斯田鐵安定度高，鋼材之伸長率減少（<50%)，會妨礙加工性。另外，Md30值超過3〇。〇時，雖可藉加工誘發麻田散鐵之生成(α，相)來提昇鋼材之伸長率，然而由於生成之α’相具有磁性，因此加工品會帶有磁性。Md30值在一 1〇〜3〇C時，本發明之高Μη不銹鋼可維持加工品之非磁性且可提升鋼材之加工性。豐差能之生成指標：SFE(mJ/m2) 與bcc構造之t通鋼概，具有fee構造找細鐵不錢鋼由 200521251 於容易生成疊差，因此加卫硬化大。本發明為了可以高加工率進行冷加工或深拉伸加工等域成形，採用不易生成疊差之容易錯位之交叉滑移之成分設計。近年來，不錄鋼板大多·冷加工製造複雜形狀之製品。於該情況下’加讀化大之鋼材必須於加工途巾—聽人中間退火步驟來進行軟化-面反鶴作，以得到大加n江硬化小之鋼材則可省略中間退火步驟來進行製品加卫，可大幅度地減少製成本。本發明人等由5峨點檢討影響疊差能(舰)之成分。結果，將定義成SFE(mJ/m2) ·· 6.2Ni+ l8.6Cu + a7Cr+3 施 + 9 3M〇 -53之SFE調整至40~80之高細時，可展縣發明之目的之優異之加工性。 SFE小於40時，高Μη不銹鋼容易生成疊差，加工硬化大，無法得到本發明之目的之加工性。此時，以拉伸試驗得到之加工硬化指數η值(真應力-對數延伸應變線)超過〇·45。另外，spF超過8〇時，加工硬化小，η值小於〇·3。此時，於實用之加壓成形會有拉伸加工性降低之問題。因此，本發明中以拉伸試驗得到in值最好在0.3〜0.45之範圍中。滿足本發明之jyjd3〇值與SFE之軟質且加工硬化性小，並且非磁性之鋼材不會產生代表SUS3〇4之Μ系之沃斯田系不銹鋼中構成問題之時期裂縫（自然破裂），具有優異之可歷經夕步驟之殊拉伸性。即，SUS304由於沃斯田鐵相為介穩定，因此於加工中會產生麻田散鐵變態，於深拉伸成形時因邊緣部過硬，殘留應力增大，會產生自然破裂。調整成本發明之C+N : 0.03〜0.15%、MD30值：一1〇〜3〇 C、SFE · 40〜80(mJ/m2)之高Μη不銹鋼材，係0.2%耐力小於 200521251 3〇〇MPa ’域質’加工硬化性小’且可以高加工率進行冷加工之非磁性不銹鋼。以下，本發明之除了C與N以外之合金元素由以下範圍中選定。 • Si · 0.1 〜1%When the Md value is less than _1 (rc, because of the high stability of Vostian iron, the elongation of the steel is reduced (<50%), which will hinder the workability. In addition, when the Md30 value exceeds 30.0, it can be processed by borrowing Induction of the production of α (phase, phase) of Asada to increase the elongation of steel, however, since the generated α 'phase is magnetic, the processed product will have magnetic properties. When the Md30 value is between 10 and 30 ° C, the present invention The high Mη stainless steel can maintain the non-magnetic properties of the processed products and can improve the workability of the steel. The index for the generation of the difference energy: SFE (mJ / m2) and tcc steel structure with bcc structure. It has a fee structure to find fine iron. From 200521251, it is easy to generate stacking, so the hardening is large. In order to perform cold forming or deep drawing processing at a high processing rate, the present invention uses the component design of cross slip that is not easy to generate stacking and is easily dislocated. Most of the steel plates are not recorded. Cold-formed products with complex shapes are produced. In this case, the steel with a large size must be processed in the process of annealing-listening to the intermediate annealing step to perform softening-surface anti-cracking to obtain a large Canadian n river. Small hardened steel can be omitted Intensifying the annealing process to strengthen the product can greatly reduce the production cost. The inventors reviewed the components that affect the stacking energy (ship) from the 5E point. As a result, it will be defined as SFE (mJ / m2) ·· 6.2 Ni + l8.6Cu + a7Cr + 3 Shi + 9 3M〇-53 When the SFE is adjusted to a high fineness of 40 ~ 80, the excellent processability of the purpose of the invention can be exhibited. When SFE is less than 40, high Mn stainless steel is prone to stack Poor work hardening makes it impossible to obtain the workability of the object of the present invention. At this time, the work hardening index η (true stress-logarithmic extension strain line) obtained by the tensile test exceeds 0.45. In addition, the spF exceeds 80. In this case, the work hardening is small, and the value of η is less than 0.3. At this time, there is a problem that the press workability is reduced in practical use. Therefore, in the present invention, the value of in obtained by the tensile test is preferably 0.3 to 0.45. In the range, the jyjd30 value of the present invention and the softness and work hardening of SFE are small, and the non-magnetic steel does not generate the period cracks (natural Rupture), has excellent stretchability that can withstand the steps of the night. In other words, SUS304 is stable because of the iron phase of Vostian. Therefore, the loose iron in Asada is deformed during processing, and the residual stress will increase due to the hard edges at the deep drawing forming. Natural fracture will occur. + N: 0.03 ~ 0.15%, MD30 value:-10 ~ 30 ° C, SFE · 40 ~ 80 (mJ / m2) high Mη stainless steel, 0.2% endurance is less than 200521251 300MPa 'domain quality' Non-magnetic stainless steel with low work hardenability and cold workability with high workability. Hereinafter, alloy elements other than C and N of the present invention are selected from the following ranges. • Si · 0.1 to 1%

Si可於熔製時發揮作為脫氧劑之功用，為了得到其效果要 · 添加0.1%以上。最好姐3%以上。又，Si係降低固熔強化及SFE . 乂助長力DJI強化之元素。因此，為了得到本發明之小於3〇〇MPa 之0.2%耐力、加工硬化指婁红值小於〇45之加工硬化性上限為ι% 以下。且最好在〇·2〜0.7%以下。籲 • Μη ·· 3〜15% Μη除了可於炼製時作為脫氧劑使用，還可有效地維持非磁性且可替代Νι作為沃斯田鐵形成元素使用。於本發日种，為了得到别述作用，添加3%以上之Μη。且最好添加5%以上。另外， Μη之添加會使s系雜質增加，有阻礙耐腐蝕性及加工性之問題。因此，上限為15%。且最好為1〇%以下。 • Cr · 10〜16%Si can function as a deoxidizing agent during melting. To obtain its effect, add 0.1% or more. The best sister is more than 3%. In addition, Si is an element that reduces solid solution strengthening and SFE. 乂 promotes DJI strengthening. Therefore, in order to obtain the 0.2% endurance of less than 300 MPa and the work hardening index of the present invention, the work hardenability upper limit is less than ι%. In addition, it is preferably 0.2 to 0.7% or less. Cue • Μη · 3 to 15% Mn can be used as a deoxidizing agent during refining, can effectively maintain non-magnetic properties, and can be used as an iron forming element instead of Nim. In the present day, in order to obtain other effects, more than 3% of Mn is added. And it is best to add more than 5%. In addition, the addition of Mn causes an increase in s-based impurities, which has the problem of impeding corrosion resistance and processability. Therefore, the upper limit is 15%. It is preferably at most 10%. • Cr · 10 ~ 16%

Cr係為了得到不銹鋼要求之耐腐餘性之必要元素，最好必需 · 要有10%以上。且尤宜在12%以上。另外，Cr係降低固熔強化及 SFE以助長加工硬化之元素。因此，為了得到本發明之小於 300MPa之0.2%耐力、加ji硬化指數n值小於0 45之小加工硬化性’上限為16%以下。且最好在15%以下。Cr is an essential element in order to obtain the corrosion resistance required by stainless steel. It must be at least 10%. And especially suitable for more than 12%. In addition, Cr is an element that reduces solid solution strengthening and SFE to promote work hardening. Therefore, in order to obtain the 0.2% endurance of less than 300 MPa according to the present invention, the upper limit of the small work hardenability 'with a hardening index n value of less than 0.45 is 16% or less. And preferably below 15%.

Ni · 1 〜6%Ni · 1 to 6%

Ni係高價元素，且超過6%之300系之沃斯田鐵不銹鋼會使原料成本上升。因此，Ni為6%以下。且最好為6%以下。尤宜為5% 11 200521251 以下。嶋沃斯田鐵獨鋼必要之元素，且係有助於確保冷加工後之非磁性及延展性之元素。故，下限為1%。 • Cu ： 0.3-3%Ni-based high-priced elements, and more than 6% of 300-series Vostian iron stainless steel will increase the cost of raw materials. Therefore, Ni is 6% or less. And preferably it is 6% or less. Especially preferred is below 5% 11 200521251.嶋 Vostian iron single steel is an essential element, and is an element that helps ensure non-magnetic and ductility after cold working. Therefore, the lower limit is 1%. • Cu: 0.3-3%

Cu係可降低本發明所定義之腕職並提昇SFE，以有效地改善加工性之合金元素。本發明中為了得到該等元素，Cu之下限為0·3%以上。最好為1%以上。然而，添加過量之Cu會有製鋼時之Cu污染或誘發熱脆性之問題產生。又，SFE過度上升會造成加工性降低。因此，Cu之上限為3%以下。 • Mo : 0.3〜3%Cu is an alloying element that can reduce the wrist function as defined in the present invention and enhance SFE to effectively improve the workability. In order to obtain these elements in the present invention, the lower limit of Cu is 0.3% or more. It is preferably 1% or more. However, the excessive addition of Cu may cause problems of Cu contamination or inducing hot brittleness during steel making. In addition, an excessive rise in SFE will cause a decrease in workability. Therefore, the upper limit of Cu is 3% or less. • Mo: 0.3 ~ 3%

Mo係有助於提昇耐腐蝕性之元素。又，係可降低本發明所疋義之Md30值並提昇SFE以改善加工性之有效元素。為了確保本發明之南Μη不銹鋼之耐腐餘性及加工性，M〇之下限為〇3%以上。然而’含有過多Mo時，因生成占肥粒鐵而展現出磁性，且強度會因固溶強化而提昇。故，Mo之上限為3%以下。 • REM : 0.001 〜0.2% REM係依照必要添加之元素，具有改善熱加工性及耐氧化性之作用。為了得到該等作用，添加0.001%以上。然而，添加REM 之效果於0.25達到飽和，添加〇·2%以上亦只會使鋼材硬質化且加工性降低。因此，上限宜為0.2%。實施例熔製具有表1之化學組成之不銹鋼，藉加熱溫度12〇〇°C之熱壓軋製成板厚4.0mm之熱軋鋼板。以1120°C、均熱時間2分鐘使熱軋鋼板退火，並於酸洗後冷壓軋，使板厚為L5mm，且進行1060 t：、均熱時間2分鐘之中間退火，於酸洗後形成板厚〇.7mm之冷軋 12 200521251 鋼板，並且以1060°C，均熱時間1分鐘實施最終退火(退火酸洗材)。藉將中間退火酸洗材冷壓軋成板厚0.6mm，得到60%冷軋材。由退火酸洗材切下JIS13B拉伸試驗片，並藉拉伸試驗測量 0.2%耐力、拉伸強度、伸長率、及加工硬化指數n 〇加工硬化指數η係求出相當於公稱應變乃％與35%之真應變ε μ、ε 35中之真應力ε μ、ε 35，並依照下式算出加工硬化指數η值。 Ν值=ΐη( ε 35/ ε 25)/1η( ε 35/ ε 25) 由退火酸洗材切下096mm圓盤(切料），藉穿孔直徑"牝― 444 040 0 35 0 30mm之5段圓筒深引伸試驗調查時期裂縫極限拉伸比(切料系/穿孔系）。由60%冷軋材切下試驗片，藉磁性天秤測量磁化之引力於施加磁場-磁化曲線上在磁場5〇〇〇gaup中之傾斜度，而求出磁導率。於表2顯示退火酸洗材之〇·2%耐力、拉伸強度、伸長率、n 值及60%冷札材之磁導率(μ)，Ν〇1〜6滿足本發明所規定之高他不銹鋼之成分設計條件，與304同程度之〇 2%耐力小於3〇〇Mpa，具有伸長率為5〇%以上之機雛f，加猶化指數岭⑽〜〇45之小於3〇4且加王硬化小，60%冷壓軋材之磁導率為1 〇5以下之非磁性。且，本鋼期多階段拉伸成形，不會產生時歸縫，得到時期裂縫極限延伸比3.2以上之遠大於SUS3()4之值。鋼Ν〇 7〜14由於 C + N量賴d值與SFE兩者或—者不符合本發明所規定之條件，因此無法_本發明之目標之靖之加讀與非雜。鋼ν〇Μ 係用㈣較加工性之S卿4。鋼N。16〜29並不滿足本發明所規定之成分範圍，沒有制目標确材之加讀與非磁性。調查〇·2%耐力與成分之關係，得到以下式表示之回歸式，藉 13 200521251 減少C + Ν量，可使0.2%耐力小於3〇〇MPa並軟質化。0.2%耐力 [N/mm2 ] = 875 * (C + N) + 3.87Mn - 1.48Ni - 3.53Cu + 8.58Cr + 19.7 於第1圖及第2圖顯示沃斯田鐵安定度之指標Md30值對鋼材之延伸率與磁導率之影響之檢討結果。如第丨圖及第2磁所示，可確适藉控制在一 1〇<Md30<30，可得到本發明之目標之延伸率： 50%以上、# : 1〇5以下。又’檢討疊差能之生成指標SFE與加工硬化指數n之關係之結果，如第3圖所示，可確認藉4〇<SFE<80，可得到本發明之目標之η值。Mo is an element that helps improve corrosion resistance. In addition, it is an effective element that can reduce the Md30 value as defined in the present invention and improve SFE to improve processability. In order to ensure the corrosion resistance and processability of the southern Mn stainless steel of the present invention, the lower limit of Mo is 0.3% or more. However, when '' contains too much Mo, it will exhibit magnetic properties due to the formation of iron particles, and the strength will be enhanced by solid solution strengthening. Therefore, the upper limit of Mo is 3% or less. • REM: 0.001 to 0.2% REM is an element added as necessary to improve hot workability and oxidation resistance. In order to obtain these effects, 0.001% or more is added. However, the effect of adding REM is saturated at 0.25, and adding 0.2% or more will only harden the steel and reduce the workability. Therefore, the upper limit should be 0.2%. EXAMPLES A stainless steel having the chemical composition of Table 1 was melted, and a hot-rolled steel sheet having a thickness of 4.0 mm was prepared by hot-rolling at a heating temperature of 1200 ° C. The hot-rolled steel sheet was annealed at 1120 ° C and soaking time for 2 minutes, and cold-rolled after pickling to a plate thickness of L5mm, and subjected to 1060 t: intermediate annealing with soaking time of 2 minutes, after pickling A cold-rolled 12 200521251 steel sheet having a plate thickness of 0.7 mm was formed, and final annealing (annealing and pickling) was performed at 1060 ° C and a soaking time of 1 minute. The intermediate annealing pickling material was cold-rolled to a thickness of 0.6 mm to obtain a 60% cold-rolled material. The JIS13B tensile test piece was cut from the annealed pickling material, and 0.2% resistance, tensile strength, elongation, and work hardening index n were measured by a tensile test. The work hardening index η was calculated to be equivalent to the nominal strain and% The true strains ε μ and ε 35 of 35% true strains ε μ and ε 35 are calculated according to the following formula. Ν 值 = ΐη (ε 35 / ε 25) / 1η (ε 35 / ε 25) Cut out a 096mm disc (cutting material) from an annealed pickling material, and use the perforation diameter " 牝 ― 444 040 0 35 0 30mm 5 The ultimate tensile ratio of cracks during the deep-extension test of the segmented cylinder (cutting system / perforation system). The test piece was cut from a 60% cold-rolled material, and a magnetic balance was used to measure the gravitational force of the magnetization and the gradient of the magnetic field-magnetization curve in a magnetic field of 5,000 gaup to determine the magnetic permeability. Table 2 shows the 0.2% endurance, tensile strength, elongation, n value, and magnetic permeability (μ) of 60% cold-rolled material for annealing and pickling materials. No. 1 to 6 meet the high requirements of the present invention. The composition design conditions of other stainless steels are as high as 304. The endurance of 002% is less than 3,000 MPa, and the elongation rate is more than 50%. The addition index is less than 304, and the range of ridge index is 0. King hardening is small, and the magnetic permeability of 60% cold-rolled material is non-magnetic less than 105. In addition, the multi-stage stretch forming of this steel will not return to the seam at the time, and it will be obtained that the limit elongation ratio of the crack at the time is 3.2 or more, which is much larger than the value of SUS3 () 4. Steel No. 7 ~ 14 because the amount of C + N depends on both the value of d and SFE, or does not meet the conditions stipulated in the present invention, it is impossible to add reading and non-complexity of the object of the present invention. Steel νOM is made of steel, which is more workable. Steel N. 16 to 29 does not satisfy the composition range specified in the present invention, and there is no additional reading and non-magnetic properties of the target material. By investigating the relationship between 0.2% endurance and the composition, we obtain the regression formula expressed by the following formula. By reducing the amount of C + Ν by 13 200521251, 0.2% endurance can be made less than 300 MPa and softened. 0.2% endurance [N / mm2] = 875 * (C + N) + 3.87Mn-1.48Ni-3.53Cu + 8.58Cr + 19.7 In Figure 1 and Figure 2, the Md30 value index Review of the effects of elongation and permeability of steel. As shown in Fig. 丨 and the second magnetic field, it can be determined that the elongation of the target of the present invention can be obtained by controlling it at 10 < Md30 < 30: more than 50%, #: less than 105. Furthermore, as a result of reviewing the relationship between the generation index SFE and the work hardening index n of the stack energy, as shown in Fig. 3, it can be confirmed that by using 40 < SFE < 80, the value of the target of the present invention can be obtained.

14 200521251 I * 犖 K κ t 1 1¾ § 2 4< z ώ 1 CO K 1 sz -K UJ 〇0 1 u3 1/5 t κ iif 00 κ 1 I to i t t! 雄圣 i s 担 -κ Τ 4- ϋ私幸 1 & t •κ 甾 -K s l h i 幸 jT I 1 1 -K 裡 Τ 1 ι/> ·ί4 Τ Κ 扭 +< 1 ώ •K c έ S5 1 •K ώ 1 $ » t K £1 4< 窝 1 1 -K ¢1 c έ CO T s 5 c •K CO 1 K £ Γ0 rri Λ» Γ0 cn ΛΙΙ CO CO ΛΚ CM ri Λ» CM c6 All Γ0 CO ΛΒ o c4 o csi o Cvj CO CO Ml CO AH c^i o c\i V "C* ca o c4 o CNJ o csi V ο ci ο csi o csi V V ο CS Γ〇 ci ΛΜ Ο ci V XT csi 卜 CNJ o C>3 V csi s s g 〇 s g o g s g 〇 o 餐 o c4 o o s s Γ0 ο cji Ξ s Ξ ο C0 ο ο ο V S g o ro S Ξ d ?8 c5 o 〇 d O 茺 d CO ? 55 o ? CO o IS ? 岑 ? s ? i8 ? d 疾 c5 s ο 沿 ο o o 轺 o 异 c5 S ? 穿 ο s o o o s ? ? 茺 ? 4 Ul^ 55 CO 00 s 卜 s ·—· 5i o αί 7 5? O * o 普 ο 8 cn ii 〇 iO s in ιη 疙 to ο ♦ o o 00 : ο S ο κ ο S o o 普 m o m 拿划 4想 s 荚 tJD i § § § § 00 1 碧 s u> to 1 CO s § g s 1 1 § § 1 1 g § i § § J2 ID S -R d ® CO § g § S in S o KO in * CJ 1 a g g 1 餐 § 1 i 约 g 裘 1 i s CJ5 g in fee CO -v ts S o \έ s o 00 CO 0D id ca 00 iS 卜 % 卜 o s§ <£> VO 卜 5 KP t Η ρ o c〇 55 (£> σ> δ σ> 〇> 卜 CO 00 s o LO S 00 异 σ> 8 S ο ip 运 5 卜 o 1 tn s 1 o 00 ci m S 00 异 CS) 1 in o ο ΐέ ΙΟ οο C； ① σί 卜 cd 0¾ tri 卜 o ? «1 成 1 1 1 1 1 1 1 cs 1 1 1 1 1 1 1 1 1 1 1 I I 1 1 1 I I I 1 1 1 I S d 〇 g 〇 g d 〇一 — ο 〇 o s c5 o CNI 〇 i d 〇 d 〇 o § Ο 1 o § 〇 o 忘 o § 〇 Ο S ο s o S O Ο Ξ g ο Ο ο 1 ο 〇 c5 〇 § c> d 2 〇 CO O 1 c5 i d § <6 爱 ο Λ c> ¢5 c〇 o i c> § d § o § o § Ο I d i o i o 〇 c> to s ο § d n d in s o i ο § Ο 漠 ο § d o d § d o d ΙΛ δ c> 3 s ci o CO s CsJ 8 二 s c4 o c5 8 s r4 8 CN$ 8 C4 s ο 8 r5 o o 8 C4 S5 δ S5 οά o ci s 8 ri S ο S 沄 d 5§ 8 〇 d S c〇玛 O 沿 o s c5 d s o 纪 d s d> 8 c5 8 ci 8 ci 8 沄 c5 d o d d ο 8 s ο 玥 o o 8 Ο 沄 ο 沄 d 沄 d 8 — 〇 8 d d ώ to 00 i〇 o 土 in iO m CsJ 00 CSJ CO 〇 (£ O to ο o CS3 00 If) in ο ι〇 ΙΟ 00 ui 00 iri CSJ ιη ο 2 ιΛ ai CO 00 tO CO i£> VO jo £ s in s CO ui — s? ko s CsJ s to 8 u5 8 CD 8 一 s if> 00 r i〇 $ %〇 ΤΓ s xr S ο S α5 s iri s s σ s — 宕 ίο 〇〇 8 C5 i O i O § o o 碧 d i 〇 i <5 i d i d i o 羅 ci 8 Ο I O i d 1 d 髮 Ο ο 客 d d 8 o 8 Ο 8 Ο § d 1 d 1 d i d 1 o 1 O Ou I 〇 i c5 I c> 1 o i o i O i o § o i d i C5 § o i o i Ο i C) | d i d 1 c5 § ο 1 ο § o 1 d I ο § Ο I d § d § d § o § o i d s od o cr> i〇 8 L〇 ig CO iB CO s 40 CD 〇 o c> 8 00 o 8 卜· o o 8 o ci s σί 00 s ci s oi o id ο ο S g ci S d 8 00 8 ci o rr g 00 写 o 写 o s o 5 o o s o o o s§ o δ o s s 〇 s o 〇 s o o o S ο o o o o δ ο ο %Λ d CO o § c5 00 s o § o 1 °' § 〇· 1 o g o i o § o’ § d § o i o § 〇 I 〇· § o § o i〇 o § ο i d I o i o 1 § ο s d S d | O’ o o i 〇· c> 理 r〕 CO in Ci 卜 oc cn o丨~ CO co iC u: *、 00 o ro 飧®塚盔珈4韁¾ϊ (<猞0 ·6Ιΐ3οο5·οο+ηο0νο·00-S8” ·Ι-ίζοο·ε+(No) *SZ8=【ΕΕ/£^*%2 .0 OKCOS-OWCO,6+ewcv3.co+Jozo+n39 .0072^.9=1:^/16:13¾ οί·οοτ(π:}+»»ΗΝ)02-ώζ .n-cwiod-isCNJcr;-(Ni)CSJ9 了 Z6 了 oes tiw^«tiT4w 塚槊K-uw 吨 w 醵mw 轵伞 ^ 產業上之可利用性本發明之南Μη不鎮鋼可貫現習知之南Μη不錢鋼無法進行之成形加工，可應用在使用代表SUS之Ni系不銹鋼之加壓成形用途上。特別最適合用在SUS304會有時期破裂之問題之歷經 15 200521251 之深拉伸加工用途上。且，由於亦可省略SUS304加工後之用以非磁性化之退火’因此，可廣泛地應用於要求非磁性之成形加工用之材料之領域。 t圖式簡單說明3 第1圖係顯不Md30值對鋼材之伸長率之影響之圖表。第2圖係顯示Md30值對60%冷壓軋材之磁導率之影響之圖 ' 表。第3圖係顯示SFE與加工硬化指數11之關係之圖表。14 200521251 I * 荦 K κ t 1 1¾ § 2 4 < z FREE 1 CO K 1 sz -K UJ 〇0 1 u3 1/5 t κ iif 00 κ 1 I to itt! Xiongsheng is dan-κ Τ 4- ϋ 私幸 1 & t • κ steroid-K slhi 幸 jT I 1 1 -K 里 Τ 1 ι / > · ί4 Τ Κ twist + < 1 FREE • K c S S5 1 • K FREE 1 $ »t K £ 1 4 < Nest 1 1 -K ¢ 1 c CO CO T s 5 c • K CO 1 K £ Γ0 rri Λ »Γ0 cn ΛΙΙ CO CO ΛΚ CM ri Λ» CM c6 All Γ0 CO ΛΒ o c4 o csi o Cvj CO CO Ml CO AH c ^ ioc \ i V " C * ca o c4 o CNJ o csi V ο ci ο csi o csi VV ο CS Γ〇ci ΛΜ Ο ci V XT csi bu CNJ o C > 3 V csi ssg 〇sgogsg 〇o meal o c4 ooss Γ0 ο cji Ξ s Ξ ο C0 ο ο VS VS go ro S Ξ d? 8 c5 o 〇d O 茺 d CO? 55 o? CO o IS? Cen? s? i8? d disease c5 s ο along ο oo 轺 o different c5 S? wear ο sooos?? 茺? 4 Ul ^ 55 CO 00 s s ··· 5i o αί 7 5? O * o ο 8 cn ii 〇iO s in ιη 疙 to ο ♦ oo 00: ο S ο κ ο S oo pumo draw 4 think s pod tJD i § § § § 00 1 Bis u > to 1 CO s § gs 1 1 § § 1 1 g § i § § J2 ID S -R d ® CO § g § S in S o KO in * CJ 1 agg 1 meal § 1 i gg 11 is CJ5 g in fee CO -v ts S o \ έ so 00 CO 0D id ca 00 iS bu% bu os§ < £ > VO bu 5 KP t Η ρ oc〇55 (£ > σ > δ σ > 〇 > bu CO 00 so LO S 00 different σ > 8 S ο ip transport 5 bu o 1 tn s 1 o 00 ci m S 00 different CS) 1 in o ο ΐέ ΙΟ οο C; ① σί cd 0¾ tri bu o? «1 into 1 1 1 1 1 1 1 cs 1 1 1 1 1 1 1 1 1 1 1 II 1 1 III 1 1 1 IS d 〇g 〇gd 〇一 — ο 〇os c5 o CNI 〇id 〇d 〇o § 〇 1 o § 〇o forget o § 〇〇 S ο so SO Ο Ξ g ο Ο ο 1 ο 〇c5 〇§ c > d 2 〇CO O 1 c5 id § < 6 love ο Λ c > ¢ 5 c〇oi c > § d § o § o § Ο I dioio 〇c > to s ο § dnd in soi ο § Ο Moο § dod § dod ΙΛ δ c > 3 s ci o CO s CsJ 8 2s c4 o c5 8 s r4 8 $ 8 C4 s ο 8 r5 oo 8 C4 S5 δ S5 οά o ci s 8 ri S ο S 沄 d 5§ 8 〇d S c〇玛 O os c5 dso ds d > 8 c5 8 ci 8 ci 8 沄 c5 dodd ο 8 s ο 玥 oo 8 Ο Οο 沄 d 沄 d 8 — 〇8 dd free to 00 i〇o soil in iO m CsJ 00 CSJ CO 〇 (£ O to ο o CS3 00 If) in ο ι〇ΙΟ 00 ui 00 iri CSJ ιη ο 2 ιΛ ai CO 00 tO CO i £ > VO jo £ s in s CO ui — s? ko s CsJ s to 8 u5 8 CD 8 s if > 00 ri〇 $% 〇ΤΓ s xr S ο S α5 s iri ss σ s — ίο 〇〇8 C5 i O i O § oo didi 〇i < 5 ididio Luoci 8 IO IO id 1 d send ο ο guest dd 8 o 8 Ο 8 Ο § d 1 d 1 did 1 o 1 O Ou I 〇i c5 I c > 1 oioi O io § oidi C5 § oioi Ο i C) | did 1 c5 § ο 1 ο § o 1 d I ο § Ο I d § d § d § o § oids od o cr > i〇8 L〇ig CO iB CO s 40 CD 〇o c > 8 00 o 8 BU oo 8 o ci s σί 00 s ci s oi o id ο ο S g ci S d 8 00 8 ci o rr g 00 Write o Write oso 5 oosooos§ o δ oss 〇so 〇sooo S ο oooo δ ο ο% Λ d CO o § c5 00 so § o 1 ° '§ 〇 · 1 ogoio § o' § d § oio § 〇 I 〇 · § o § oi〇o § ο id I oio 1 § ο sd S d | O 'ooi 〇 · c > r] CO in Ci bu oc cn o 丨 ~ CO co iC u: *, 00 o ro 飧® Tsutsuma helmet 4 缰 ¾ϊ (< · 0 · 6Ιΐ3οο5 · οο + ηο0νο · 00-S8 ”· Ι-ίζοο · ε + (No) * SZ8 = 【ΕΕ / £ ^ *% 2 .0 OKCOS-OWCO, 6 + ewcv3.co + Jozo + n39 .0072 ^ .9 = 1: ^ / 16: 13¾ οί · οοτ (π:} + »» ΗΝ) 02-ώζ .n-cwiod-isCNJcr ;-( Ni) CSJ9 Z6: oes tiw ^ «tiT4w Tsukasa K-uw ton w 醵 mw 轵 Umbrella ^ Industrial applicability The south Mn steel of the present invention can realize the forming process which is not known to the south Mn steel. It is used for pressure forming applications using Ni-based stainless steel, which is SUS. It is especially suitable for deep drawing processing applications where SUS304 has the problem of rupture over time. Furthermore, since the annealing for non-magnetization after processing of SUS304 can also be omitted, it can be widely used in the field of materials that require non-magnetic forming processing. Brief description of t diagram 3 The first diagram is a graph showing the effect of Md30 value on the elongation of steel. Figure 2 is a graph showing the effect of the Md30 value on the magnetic permeability of 60% cold rolled products. Figure 3 is a graph showing the relationship between SFE and work hardening index 11.

1616

Claims

200521251 十、申請專利範圍： 1· 一種加工性優異之沃斯田系高Mn不鑄鋼，以質量％计’係由以下之成分構成：C + N : 〇·〇3〜0.15%，si : 〇·1 〜1%，Μη : 3〜15%，Cr : 10〜16%，Ni ··卜6%，Cu : 5 〇·3〜3%，及M〇 : 〇·3〜3%，且其餘部份由Fe和不可避免之雜質構成，又，沃斯田鐵安定度之指標Md3〇值與 $差此之生成指標S FE滿足下述條件：一 10<Md30<30、40<SFE<80 Md30(C) · 497-462(C + N)-9.2Si-8·1Μη-13.7Cr- 10 20(Ni + Cu)- 18.5Mo SFE(mJ/m ) . 6.2Ni+18.6Cu +〇.7Cr+3.2Mn+9.3Mo — 53 〇 2·如申請專利範圍第i項之加工性優異之沃斯田系高不銹鋼，以質量％計，更含有〇〇〇1〜〇 2%REM。 15 3·如申請專利範圍第2項之加工性優異之沃斯田系高Mn 不銹鋼，其中〇·2%耐力小於3〇〇Mpa，公稱應變25%與 35%之寺級之加工硬化指數n為〇 %〜〇 45，且伸長率為 50%以上。 17200521251 10. Scope of patent application: 1. A type of high Mn non-cast steel with excellent workability, in terms of mass%, is composed of the following components: C + N: 〇 · 〇3 ~ 0.15%, si: 〇 · 1 ~ 1%, Μη: 3 ~ 15%, Cr: 10 ~ 16%, Ni ·· Bu 6%, Cu: 5 3.0 ~ 3%, and Mo: 0.3 ~ 3%, and The remaining part is composed of Fe and unavoidable impurities. In addition, the production index S FE which is the difference between the Md30 value and the $ index of Vostian iron stability satisfies the following conditions: 10 < Md30 < 30, 40 < SFE < 80 Md30 (C) 497-462 (C + N) -9.2Si-8 · 1Μη-13.7Cr-10 10 20 (Ni + Cu)-18.5Mo SFE (mJ / m) 6.2Ni + 18.6Cu + 〇. 7Cr + 3.2Mn + 9.3Mo — 53 〇2. As the Wastian high stainless steel with excellent processability in item i of the patent application scope, it contains 0.001% to 0.02% REM in terms of mass%. 15 3 · Wasfield high Mn stainless steel with excellent processability as described in item 2 of the scope of patent application, among which 0.2% endurance is less than 300Mpa, nominal strain 25% and 35% temple-level work hardening index n It is 0% to 045, and the elongation is 50% or more. 17