JP2003113450A5 - - Google Patents
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- JP2003113450A5 JP2003113450A5 JP2001312371A JP2001312371A JP2003113450A5 JP 2003113450 A5 JP2003113450 A5 JP 2003113450A5 JP 2001312371 A JP2001312371 A JP 2001312371A JP 2001312371 A JP2001312371 A JP 2001312371A JP 2003113450 A5 JP2003113450 A5 JP 2003113450A5
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- reduced
- hardening
- stability index
- austenite stability
- manufacturing cost
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Description
しかし、破断伸びの低下は、何れの方法による場合でも素材の硬質化，高強度化を招き、打抜き金型に対する負荷を増加させる。その結果，打抜き製品の寸法精度を向上できても、金型寿命が非常に短くなり、製造コストが高くなる。金型の短命化や製造コストの上昇は、軟質で加工硬化の小さな素材を使用することによって解決できる。そこで、本発明においては，前掲の式(１)で定義されるオーステナイト安定指数Ｍｄ30が−１０以下（好ましくは，−２０以下）となるように成分設計することにより，加工誘起マルテンサイト相の生成を防止することにより加工硬化を抑制している。また、オーステナイト安定指数Ｍｄ30を−１２０以上（好ましくは、−９０以上）とすることにより、剪断破面に占める剪断面の割合が低下することを防止している。 However, the reduction in breaking elongation causes hardening and strengthening of the material in any of the methods, and increases the load on the punching die. As a result, even if the dimensional accuracy of the stamped product can be improved, the mold life becomes very short and the manufacturing cost becomes high. The shortening of mold life and the increase in manufacturing cost can be solved by using a soft, work-hardening small material. Therefore, in the present invention, by designing the component so that the austenite stability index Md 30 defined by the above-mentioned equation (1) is -10 or less (preferably -20 or less), Work hardening is suppressed by preventing formation. Further, by setting the austenite stability index Md 30 to -120 or more (preferably -90 or more), the reduction of the ratio of the sheared surface to the sheared surface is prevented.
【００３４】
【発明の効果】
以上に説明したように、本発明のオーステナイト系ステンレス鋼板は、オーステナイト安定指数Ｍｄ30を−１２０〜−１０，積層欠陥難易度指数ＳＦＥを３０以上とする成分設計を採用し、調質圧延や結晶粒の微細化により引張破断伸びを低減しているため、ダレ量が少なく高精度の打ち抜き破面をもつ製品に打ち抜き加工できる。しかも、引張強さを小さくしているので、打抜き金型に加わる負荷が低減され、金型寿命も長くなる。このようにして得られた打抜き製品は、研摩，冷間鍛造等の後処理を必要とすることなく、種々の分野における部品や部材として使用される。
[0034]
【Effect of the invention】
As described above, the austenitic stainless steel sheet of the present invention adopts a component design in which the austenite stability index Md 30 is -120 to -10 and the stacking fault difficulty index SFE is 30 or more, and temper rolling and crystals Since the tensile elongation at break is reduced by grain refinement, it is possible to punch into a product with a small amount of sag and a high precision punching fracture surface. Moreover, since the tensile strength is reduced, the load applied to the punching die is reduced, and the die life is also extended. The punched products obtained in this way are used as parts and members in various fields without the need for after-treatments such as grinding and cold forging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001312371A JP3670232B2 (en) | 2001-10-10 | 2001-10-10 | Austenitic stainless steel sheet with excellent precision punchability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001312371A JP3670232B2 (en) | 2001-10-10 | 2001-10-10 | Austenitic stainless steel sheet with excellent precision punchability |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2005059390A Division JP3723569B2 (en) | 2005-03-03 | 2005-03-03 | Manufacturing method of austenitic stainless steel sheet with excellent precision punchability |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2003113450A JP2003113450A (en) | 2003-04-18 |
| JP2003113450A5 true JP2003113450A5 (en) | 2005-04-28 |
| JP3670232B2 JP3670232B2 (en) | 2005-07-13 |
Family
ID=19131043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001312371A Expired - Fee Related JP3670232B2 (en) | 2001-10-10 | 2001-10-10 | Austenitic stainless steel sheet with excellent precision punchability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3670232B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3974115B2 (en) * | 2004-03-10 | 2007-09-12 | Ｎｔｎ株式会社 | Wheel bearing device |
| JP4578296B2 (en) * | 2005-03-18 | 2010-11-10 | 日新製鋼株式会社 | Steel sheet for valve seat of air conditioner four-way valve |
-
2001
- 2001-10-10 JP JP2001312371A patent/JP3670232B2/en not_active Expired - Fee Related
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