JPH05277611A - Method for improving strength of two phase stainless steel - Google Patents
Method for improving strength of two phase stainless steelInfo
- Publication number
- JPH05277611A JPH05277611A JP10551892A JP10551892A JPH05277611A JP H05277611 A JPH05277611 A JP H05277611A JP 10551892 A JP10551892 A JP 10551892A JP 10551892 A JP10551892 A JP 10551892A JP H05277611 A JPH05277611 A JP H05277611A
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- JP
- Japan
- Prior art keywords
- stainless steel
- cold
- strength
- stock
- cold forging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、二相ステンレス鋼の強
度を向上させる方法に関するものである。FIELD OF THE INVENTION The present invention relates to a method for improving the strength of duplex stainless steel.
【０００２】[0002]
【従来の技術】ステンレス鋼は、溶体化処理あるいは溶
体化処理後に時効処理を行うのが一般的であるが、かか
るステンレス鋼の強度を向上させる手段としては、窒
素等の元素を適量添加する、冷間又は温間で加工を加
える、等の方法がある。そして、前記した方法のうちの
後者、特に冷間加工については、管・線材等の薄肉ある
いは小径品の冷間抽伸が主なものであり、二相ステンレ
ス鋼管の冷間抽伸では、図７に示すように、通常６〜７
％の冷間加工で約15％の耐力の向上が認められている。2. Description of the Related Art Stainless steel is generally subjected to a solution treatment or an aging treatment after the solution treatment. As a means for improving the strength of the stainless steel, an appropriate amount of an element such as nitrogen is added, There are methods such as adding processing cold or warm. The latter of the above-mentioned methods, particularly cold working, mainly involves cold drawing of thin-walled or small-diameter products such as pipes and wire rods. As shown, usually 6-7
% Cold working has been found to improve yield strength by about 15%.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、冷間抽
伸は通常引き抜きで行われるため、素材端部に、引き抜
き工具がグリップするための細工が必要であり、また素
材の冷間加工性を維持する目的で抽伸途中での中間焼鈍
が必要である。However, since cold drawing is usually carried out by drawing, it is necessary to make a work for gripping the drawing tool at the end of the material, and to maintain the cold workability of the material. For the purpose, intermediate annealing is required during drawing.
【０００４】本発明は、上記した従来の強度向上方法に
あった問題点に鑑みて成されたものであり、何らの細工
や中間焼鈍を行うことなく所要の強度向上を可能とする
特に二相ステンレス鋼の強度向上方法を提供することを
目的としている。The present invention has been made in view of the problems in the above-described conventional strength improving method, and it is particularly a two-phase method that enables the required strength improvement without any work or intermediate annealing. It is intended to provide a method for improving the strength of stainless steel.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る二相ステンレス鋼の強度向上方法は、
溶体化処理された二相ステンレス鋼の素材を、所要の回
転を付与しながら長手方向全域に亘って順次、部分的に
冷間鍛造しているのであり、好ましくは、冷間鍛造にお
ける冷間加工率を、0.5 〜1.6 ％とする。また、前記方
法を実施する冷間鍛造は、丸棒状素材に対して該素材の
半径より若干大径の内径をもつ丸タップ金敷を使用する
ことが望ましい。In order to achieve the above object, the method for improving the strength of duplex stainless steel according to the present invention comprises:
The solution-treated duplex stainless steel material is subjected to partial cold forging over the entire longitudinal direction while imparting the required rotation, and preferably cold working in cold forging. The rate is 0.5-1.6%. In the cold forging for carrying out the above method, it is desirable to use a round tap anvil having an inner diameter slightly larger than the radius of the round bar-shaped material.
【０００６】請求項１の本発明方法において、冷間鍛造
を行うのは、圧延よりも鍛造の方が小さい冷間加工率で
同等の効果が得られるからであり、また所要の回転を付
与しながら長手方向全域に行うのは、素材の全面・全長
に亘って均一に効果を得るためである。In the method of the present invention as set forth in claim 1, cold forging is performed because the same effect can be obtained with a smaller cold working rate than with forging, and a required rotation is applied. However, the reason for performing the entire lengthwise direction is to obtain the effect uniformly over the entire surface and the entire length of the material.
【０００７】請求項２の本発明方法において、冷間加工
率を0.5 〜1.6 ％とするのは、本発明者らの実験結果に
基づくものであり、これらの範囲であれば15％以上の伸
びを確保しつつ、耐力（Ｙｓ）、抗張力（ＴＳ）を14％
程度向上させられるからである。In the method of the present invention as set forth in claim 2, the cold working rate of 0.5 to 1.6% is based on the experimental results of the present inventors. In these ranges, the elongation is 15% or more. Proof strength (Ys), tensile strength (TS) 14% while ensuring
This is because the degree can be improved.
【０００８】また、請求項３の本発明方法において、丸
棒状素材に対して、該素材の半径より若干大径の内径を
もつ丸タップ金敷を使用するのは、鍛造効果を素材内部
に及ぼすためには、素材と金敷の接触面積を大きくする
ことが必要だからである。In the method of the present invention as set forth in claim 3, the reason for using a round tap anvil having an inner diameter slightly larger than the radius of the round bar-shaped material is that the forging effect is exerted on the inside of the material. This is because it is necessary to increase the contact area between the material and the anvil.
【０００９】[0009]
【実施例】以下、本発明方法の効果を得るために行った
実施結果に基づいて説明する。素材径がφ282 mmの25Cr
−７Ni−３Mo系二相ステンレス鋼を、冷間鍛造プレスを
用い、素材の長手方向全域に亘って冷間加工率を０％、
0.5 ％、１％、1.6 ％、２％、５％と６種類変化させて
冷間鍛造した。この際、マニュプレータで素材を挟持
し、所要の回転を付与しつつ行った。なお、この冷間鍛
造には内径がφ290 mmの丸タップ金敷を使用した。EXAMPLES Hereinafter, description will be made on the basis of the results of the experiments carried out to obtain the effects of the method of the present invention. 25Cr with a diameter of 282 mm
-7Ni-3Mo duplex stainless steel is cold forged with a cold working rate of 0% over the entire longitudinal direction of the material.
Cold forging was performed by changing 6 types of 0.5%, 1%, 1.6%, 2% and 5%. At this time, the material was clamped by a manipulator and the required rotation was applied. A circular tap anvil with an inner diameter of 290 mm was used for this cold forging.
【００１０】この場合の実験結果を図１〜図６に示す。
図１は冷間加工率と耐力との関係図、図２は冷間加工率
と抗張力との関係図、図３は冷間加工率と伸びとの関係
図、図４〜図６は素材の径方向位置と耐力・抗張力・伸
びとの関係図で、図４は冷間加工率が0.5 ％のもの、図
５は冷間加工率が1.0 ％のもの、図６は冷間加工率が1.
6 ％のものを示す。The experimental results in this case are shown in FIGS.
FIG. 1 is a relationship diagram between cold working rate and yield strength, FIG. 2 is a relationship diagram between cold working rate and tensile strength, FIG. 3 is a relationship diagram between cold working rate and elongation, and FIGS. Fig. 4 shows the relationship between radial position and yield strength / tensile strength / elongation. Fig. 4 shows cold working rate of 0.5%, Fig. 5 shows cold working rate of 1.0%, and Fig. 6 shows cold working rate of 1%. .
6% is shown.
【００１１】図１〜図３に示すように、本発明方法によ
れば、夫々目標値（耐力：56.0kgf/mm2 、抗張力：74.0
kgf/mm2 、伸び：15.0％以上）を得ることができている
のが判る。As shown in FIGS. 1 to 3, according to the method of the present invention, the respective target values (proof strength: 56.0 kgf / mm 2 , tensile strength: 74.0) are obtained.
kgf / mm 2 , elongation: 15.0% or more).
【００１２】また、本発明方法によれば、図４〜図６に
示すように、素材の径方向のバラツキが少なく、全ての
位置においても前記目標値が得られている。Further, according to the method of the present invention, as shown in FIGS. 4 to 6, there is little variation in the radial direction of the material, and the target value is obtained at all positions.
【００１３】[0013]
【発明の効果】以上説明したように、本発明方法によれ
ば、既設の冷間鍛造プレスを用い、容易かつ安価に所期
の目的を達成することができる。また、本発明方法は、
二相ステンレス鋼以外にも広く応用が可能である。As described above, according to the method of the present invention, the intended purpose can be achieved easily and inexpensively by using the existing cold forging press. Further, the method of the present invention is
Widely applicable to other than duplex stainless steel.
【図１】冷間加工率と耐力との関係図である。FIG. 1 is a relationship diagram between a cold working rate and a yield strength.
【図２】冷間加工率と抗張力との関係図である。FIG. 2 is a relationship diagram between a cold working rate and a tensile strength.
【図３】冷間加工率と伸びとの関係図である。FIG. 3 is a graph showing the relationship between cold workability and elongation.
【図４】素材の径方向位置と耐力・抗張力・伸びとの関
係図で、冷間加工率が0.5 ％のものである。FIG. 4 is a diagram showing the relationship between the radial position of the material and the yield strength / tensile strength / elongation, with a cold working rate of 0.5%.
【図５】素材の径方向位置と耐力・抗張力・伸びとの関
係図で、冷間加工率が1.0 ％のものである。FIG. 5 is a diagram showing the relationship between the radial position of the material and the proof stress / tensile strength / elongation, with a cold working rate of 1.0%.
【図６】素材の径方向位置と耐力・抗張力・伸びとの関
係図で、冷間加工率が1.6 ％のものである。[Figure 6] Relationship between radial position of material and proof strength / tensile strength / elongation, with cold working rate of 1.6%.
【図７】二相ステンレス鋼管における冷間加工率と各種
機械的強度の関係図である。FIG. 7 is a diagram showing the relationship between the cold workability and various mechanical strengths of a duplex stainless steel pipe.
Claims (3)
材を、所要の回転を付与しながら長手方向全域に亘って
順次、部分的に冷間鍛造することを特徴とする二相ステ
ンレス鋼の強度向上方法。1. A duplex stainless steel, characterized in that a solution-treated duplex stainless steel material is partially cold forged sequentially over the entire longitudinal direction while applying a required rotation. Strength improvement method.
1.6 ％としたことを特徴とする請求項１記載の二相ステ
ンレス鋼の強度向上方法。2. The cold working ratio in cold forging is from 0.5 to
The method for improving the strength of duplex stainless steel according to claim 1, wherein the strength is 1.6%.
干大径の内径をもつ丸タップ金敷を使用して冷間鍛造す
ることを特徴とする請求項１又は２記載の二相ステンレ
ス鋼の強度向上方法。3. The duplex stainless steel according to claim 1 or 2, wherein the round bar-shaped material is cold forged by using a round tap anvil having an inner diameter slightly larger than the radius of the material. To improve the strength of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10551892A JP2842040B2 (en) | 1992-03-30 | 1992-03-30 | How to improve the strength of duplex stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10551892A JP2842040B2 (en) | 1992-03-30 | 1992-03-30 | How to improve the strength of duplex stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05277611A true JPH05277611A (en) | 1993-10-26 |
| JP2842040B2 JP2842040B2 (en) | 1998-12-24 |
Family
ID=14409825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10551892A Expired - Lifetime JP2842040B2 (en) | 1992-03-30 | 1992-03-30 | How to improve the strength of duplex stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2842040B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100856590B1 (en) * | 2004-09-30 | 2008-09-03 | 지멘스 악티엔게젤샤프트 | Circuit board plug-and-socket device |
| WO2009014001A1 (en) | 2007-07-20 | 2009-01-29 | Sumitomo Metal Industries, Ltd. | Process for production of duplex stainless steel tubes |
| WO2010082395A1 (en) | 2009-01-19 | 2010-07-22 | 住友金属工業株式会社 | Process for production of duplex stainless steel pipe |
-
1992
- 1992-03-30 JP JP10551892A patent/JP2842040B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100856590B1 (en) * | 2004-09-30 | 2008-09-03 | 지멘스 악티엔게젤샤프트 | Circuit board plug-and-socket device |
| WO2009014001A1 (en) | 2007-07-20 | 2009-01-29 | Sumitomo Metal Industries, Ltd. | Process for production of duplex stainless steel tubes |
| US8333851B2 (en) | 2007-07-20 | 2012-12-18 | Sumitomo Metal Industries, Ltd. | Method for producing two-phase stainless steel pipe |
| WO2010082395A1 (en) | 2009-01-19 | 2010-07-22 | 住友金属工業株式会社 | Process for production of duplex stainless steel pipe |
| US8293037B2 (en) | 2009-01-19 | 2012-10-23 | Sumitomo Metal Industries, Ltd. | Method for producing duplex stainless steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2842040B2 (en) | 1998-12-24 |
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