JP2842040B2 - How to improve the strength of duplex stainless steel - Google Patents
How to improve the strength of duplex stainless steelInfo
- Publication number
- JP2842040B2 JP2842040B2 JP10551892A JP10551892A JP2842040B2 JP 2842040 B2 JP2842040 B2 JP 2842040B2 JP 10551892 A JP10551892 A JP 10551892A JP 10551892 A JP10551892 A JP 10551892A JP 2842040 B2 JP2842040 B2 JP 2842040B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- strength
- duplex stainless
- cold
- cold working
- 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.)
- Expired - Lifetime
Links
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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving the strength of a 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 Generally, stainless steel is 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. For example, there is a method of adding processing in a cold or warm state. The latter of the above-mentioned methods, especially for cold working, mainly involves cold drawing of thin-walled or small-diameter products such as pipes and wires. In cold drawing of duplex stainless steel pipes, FIG. As shown, usually 6-7
A 15% improvement in proof stress has been observed for cold working of 10%.
【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 performed by drawing, it is necessary to work at the end of the material for gripping by a drawing tool, and to maintain the cold workability of the material. Intermediate annealing during drawing is required for the purpose.
【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 above-mentioned problems in the conventional method for improving strength, and particularly, a two-phase method for improving strength required without performing 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丸棒状素材に、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、前記丸棒状素材の外径より若干大径の内径をも
つ丸タップ金敷を使用して断面の減少を伴う冷間鍛造を
施しているのであり、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。In order to achieve the above object, a method for improving the strength of a duplex stainless steel according to the present invention comprises:
The solution-processed duplex stainless steel round bar-shaped material is sequentially and partially applied over the entire region in the longitudinal direction while giving a required rotation, and has an inner diameter slightly larger than the outer diameter of the round bar-shaped material.
Cold forging with reduced cross section using one round tap anvil
And than are facilities, preferably, the cold working rate in cold forging, and from 0.5 to 1.6%.
【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 according to the first aspect of the present invention, the cold forging is performed because the same effect can be obtained with a smaller cold working ratio in the forging than in the rolling, and the required rotation is imparted. However, the reason why it is performed over the entire area in the longitudinal direction is to obtain an effect uniformly over the entire surface and the entire length of the material.
【０００７】また、請求項１の本発明方法において、丸
棒状素材に対して、該素材の外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。[0007] In the present invention method of claim 1, round
For the rod-shaped material, set the inner diameter slightly larger than the outer diameter of the material.
Using a round tap anvil with a forging effect allows the material to be used inside the material.
To increase the contact area between the material and the anvil
It is necessary .
【０００８】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。[0008] In the present invention a method of 請 Motomeko 2, cold working
The reason why the ratio is set to 0.5 to 1.6% is based on experimental results of the present inventors.
And within these ranges, not more than 15%
Strength (Ys), tensile strength (TS)
Is improved by about 14% .
【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。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on the results of an experiment performed to obtain the effects of the method. 25Cr with a material diameter of φ282 mm
-7Ni-3Mo duplex stainless steel, using a cold forging press, the cold working rate is 0% over the entire area in the longitudinal direction of the material,
Cold forging was performed by changing six types, 0.5%, 1%, 1.6%, 2% and 5%. At this time, the material was clamped by the manipulator and the rotation was performed while giving a required rotation. In this cold forging, a round tap anvil with an inner diameter of φ290 mm was used.
【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.
1 is a diagram showing the relationship between the cold working ratio and the proof stress, FIG. 2 is a diagram showing the relationship between the cold working ratio and the tensile strength, FIG. 3 is a diagram showing the relationship between the cold working ratio and the elongation, and FIGS. FIG. 4 is a diagram showing the relationship between the radial position and the proof stress, tensile strength, and elongation. FIG. 4 shows a case where the cold working ratio is 0.5%, FIG. 5 shows a case where the cold working ratio is 1.0%, and FIG. .
Indicates 6%.
【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
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, the variation in the radial direction of the material is small, 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 object can be easily and inexpensively achieved by using the existing cold forging press. Also, the method of the present invention,
It can be widely applied 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 diagram showing a relationship between a cold working rate and a proof stress.
【図２】冷間加工率と抗張力との関係図である。FIG. 2 is a diagram illustrating a relationship 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 diagram showing a relationship between a cold working rate 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 proof stress, tensile strength, and elongation, where the cold working rate is 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, and elongation, where the cold working rate is 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。FIG. 6 is a graph showing the relationship between the radial position of the material and the proof stress, tensile strength, and elongation, where the cold working rate is 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 a relationship between a cold working rate and various mechanical strengths in a duplex stainless steel pipe.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−179338（ＪＰ，Ａ) 特開 昭62−45440（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B21J 1/00 - 13/14 B21J 17/00 - 19/04 B21K 1/00 - 31/00 C21D 7/02────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-179338 (JP, A) JP-A-62-45440 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B21J 1/00-13/14 B21J 17/00-19/04 B21K 1/00-31/00 C21D 7/02
Claims (2)
棒状素材に、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、前記丸棒状素材の外径より若干
大径の内径をもつ丸タップ金敷を使用して断面の減少を
伴う冷間鍛造を施す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 round of solution treated duplex stainless steel.
The rod-shaped material is sequentially and partially applied over the entire region in the longitudinal direction while giving a required rotation, slightly outside the outer diameter of the round bar-shaped material.
Reduce cross section by using round tap anvil with large inner diameter
A method for improving the strength of duplex stainless steel, characterized by performing cold forging.
〜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 0.5
The method for improving the strength of a duplex stainless steel according to claim 1, wherein the strength is set to 1.6%.
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 JPH05277611A (en) | 1993-10-26 |
| JP2842040B2 true 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) |
Families Citing this family (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 |
| JP5211841B2 (en) | 2007-07-20 | 2013-06-12 | 新日鐵住金株式会社 | Manufacturing method of duplex stainless steel pipe |
| EP2388341B1 (en) | 2009-01-19 | 2018-10-31 | Nippon Steel & Sumitomo Metal Corporation | Process for production of duplex stainless steel pipe |
-
1992
- 1992-03-30 JP JP10551892A patent/JP2842040B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05277611A (en) | 1993-10-26 |
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