JPH0356646A - High strength nonmagnetic steel - Google Patents
High strength nonmagnetic steelInfo
- Publication number
- JPH0356646A JPH0356646A JP1190672A JP19067289A JPH0356646A JP H0356646 A JPH0356646 A JP H0356646A JP 1190672 A JP1190672 A JP 1190672A JP 19067289 A JP19067289 A JP 19067289A JP H0356646 A JPH0356646 A JP H0356646A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- strength
- high strength
- stress corrosion
- corrosion cracking
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims abstract 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract 3
- 229910052710 silicon Inorganic materials 0.000 claims abstract 3
- 229910052742 iron Inorganic materials 0.000 claims abstract 2
- 238000005260 corrosion Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 12
- 238000005336 cracking Methods 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 239000006104 solid solution Substances 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 229910052720 vanadium Inorganic materials 0.000 abstract description 3
- 238000005728 strengthening Methods 0.000 abstract description 2
- 229910052758 niobium Inorganic materials 0.000 abstract 3
- 230000000694 effects Effects 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- 238000005482 strain hardening Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910019590 Cr-N Inorganic materials 0.000 description 1
- 229910019588 Cr—N Inorganic materials 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Hard Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は発電機部材のりテーニングリング材として用い
られる耐応力腐食割れ性にすくれた高強度非磁性鋼に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-strength non-magnetic steel with low stress corrosion cracking resistance and used as a material for a tening ring of a power generator member.
発Ｎｍ部材のりテーニングリング材としては、従来、−
Ｃに１８Ｍｎ − ５ Ｃｒ鋼が多く使われている。Conventionally, as Nm-generating material glue tening ring material, -
18Mn-5Cr steel is often used for C.
近年、材料に要求される強度は高くなる１頃向にあり、
従って、その高強度を得るために、冷間加工率を上昇さ
せているが、それに伴い、材料の応力腐食割れ感受性が
増大している。この観点から、最近、１８Ｍｎ − ５
Ｃｒ鋼に替る材料として、耐応力腐食割れ性にすぐれ
た１８Ｍｎ − １８Ｃｒ − Ｎ ＠が、特開昭５７
− １５５３５０号公報等に開示され、広く使用されつ
つある。In recent years, the strength required of materials has been on the rise.
Therefore, in order to obtain high strength, the cold working rate is increased, but this increases the susceptibility of the material to stress corrosion cracking. From this point of view, recently 18Mn-5
As a material to replace Cr steel, 18Mn-18Cr-N@, which has excellent stress corrosion cracking resistance, was proposed in JP-A-57
- It is disclosed in Japanese Patent No. 155350, etc., and is becoming widely used.
〔発明が解決しようとする課題］
発電効率の向上、発電機の軽量化、小型化の観点から、
リテーニングリング材の高強度化が強く要望されている
。[Problems to be solved by the invention] From the viewpoint of improving power generation efficiency, reducing the weight and size of generators,
There is a strong demand for higher strength retaining ring materials.
本発明は、この要望に鑑で為されたもので、上記の１８
Ｍｎ １８Ｃｒ−Ｎ鋼のすぐれた耐応カ腐食割れ性を
生かし、さらに、高強度化を図った新規な耐応力腐食割
れ性にすぐれた高強度非磁性鋼を提供することを目的と
する。The present invention has been made in view of this need, and the above-mentioned 18
It is an object of the present invention to provide a new high-strength nonmagnetic steel with excellent stress corrosion cracking resistance, which takes advantage of the excellent stress corrosion cracking resistance of Mn 18Cr-N steel and further increases its strength.
上記目的を達或する具体的な手段は、１８Ｍｎ １８
Ｃｒ−Ｎｆｉに固溶強化元素である■、Ｎｂを単独、あ
るいは複合で適量添加することにより、高強度化を図っ
た。すなわち、本発明の構成は、重量パーセン１・で、
Ｃ ０．２％以下、ｓｉｌ％以下、Ｍｎ１５〜２５％、
Ｎｉｌ％以下、Ｃｒ１５〜２５％以下、Ｎ ０．４ 〜
１．０％を含有し、さらに、Ｖ ０．０２ 〜０． １
５％、Ｎｂ０．０２〜０．１５％の少くとも１種を含有
し、残部がＦｅ及び不可避不純物からなる高強度非磁性
鋼である。Specific means for achieving the above purpose are 18Mn 18
High strength was achieved by adding appropriate amounts of solid solution strengthening elements (1) and Nb alone or in combination to Cr-Nfi. That is, the configuration of the present invention has a weight percent of 1.
C 0.2% or less, sil% or less, Mn 15-25%,
Nil% or less, Cr15 to 25% or less, N 0.4 to
1.0% and further contains V 0.02 to 0.0%. 1
It is a high-strength nonmagnetic steel containing at least one of 5% and 0.02 to 0.15% of Nb, with the remainder being Fe and inevitable impurities.
本発明の高強度非磁性鋼の製造方法は、所望組戒の鋼塊
を溶製し、これを１１５０＠〜１２５０゜Ｃに加熱後鍛
造する。ついで、１０００〜１２００″Ｃの溶体化処理
を施した後、冷間加工を行い、加工硬化させ、高強度を
有する非磁性鋼からなるリテーニングリングとする。The method for manufacturing high-strength nonmagnetic steel of the present invention involves melting a steel ingot of a desired composition, heating it to 1150°C to 1250°C, and then forging it. Then, after solution treatment at 1000 to 1200''C, cold working is performed to work harden the retaining ring, which is made of non-magnetic steel and has high strength.
つぎに本発明の高強度非磁性鋼に含有する各成分の作用
とその限定理由について説明する。Next, the effects of each component contained in the high-strength nonmagnetic steel of the present invention and the reasons for their limitations will be explained.
旦±』４Ｘ里工
Ｃはオーステナイト相を安定させ、強度を向上させる作
用があるが、過剰に含有させると、応力腐食割れ感受性
を増大し、靭延性を阻害するため、冷間加工性が低下す
るので、その上限を０．２％とした．
影二」コ幻太■
Ｓｉは本発明鋼の溶製時に脱酸剤として作用するが、１
％を超えて含有させると、靭延性が低下するので、上限
をｌ％に定めた。4X Riko C has the effect of stabilizing the austenite phase and improving strength, but if it is included in excess, it increases stress corrosion cracking susceptibility and inhibits toughness and ductility, resulting in a decrease in cold workability. Therefore, the upper limit was set at 0.2%. Eiji "Ko Genta ■Si acts as a deoxidizing agent during melting of the steel of the present invention, but 1
If the content exceeds 1%, the toughness and ductility decreases, so the upper limit was set at 1%.
阿ｎ ： １５〜２５％
Ｍｎはオーステナイト相を安定させ、強度、加工硬化性
を向上させるためには１５％以上必要であるが、２５％
を超えて含有させると、加工硬化性が阻害されるので、
その含有量を１５〜２５％に定めた。An: 15-25% Mn is required to be 15% or more in order to stabilize the austenite phase and improve strength and work hardenability, but 25%
If the content exceeds , work hardening properties will be inhibited.
Its content was set at 15-25%.
粁±上Ｘ退工
Ｎｉはオーステナイト相を安定させ、靭延性を向上させ
るが、１％を超えて含有させると、応力腐食割れ感受性
が増大するので、その上限を１％に定めた。Although molten Ni stabilizes the austenite phase and improves toughness and ductility, if it is contained in an amount exceeding 1%, stress corrosion cracking susceptibility increases, so the upper limit was set at 1%.
Ｃｒ ： １５〜２５％
Ｃ『は本発明鋼の主要構成戒分であり、高強度、耐応力
腐食割れ性を改善するためには、１５％以上のＣｒ含有
量が必要であるが、２５％を超えて含有させると、フエ
ライトを生成して非磁性としての特性が滅しられるので
、その含有範囲を１５〜２５％に定めた。Cr: 15-25% C is a major component of the steel of the present invention, and in order to improve high strength and stress corrosion cracking resistance, a Cr content of 15% or more is required, but 25% If the content exceeds 15%, ferrite is generated and the non-magnetic properties are lost, so the content range was set at 15 to 25%.
Ｎ：０．４〜１．０ ％
窒素は本発明上、特に重要な元素であり、オーステナイ
ト相に固溶して、強度、耐応力腐食割れ性を向上させる
作用を有しているが、０．４％未満の含有量では、充分
な強度、耐応力腐食割れ性が得られず、また、１．０％
を超えて含有させると、靭延性が阻害されるので、その
含有量を０．４〜ｌ．Ｏ％に定めた。N: 0.4 to 1.0% Nitrogen is a particularly important element in the present invention, and has the effect of solid solution in the austenite phase to improve strength and stress corrosion cracking resistance. If the content is less than .4%, sufficient strength and stress corrosion cracking resistance cannot be obtained;
If the content exceeds 0.4 l., the toughness and ductility will be inhibited. It was set at 0%.
Ｖ：０．０２〜０．１５、Ｎｂ ： ０．０２〜０．１
５％本発明鋼においては、■、Ｎｂを添加することによ
ってＣ含有量を低目にすることができる。すなわち、Ｖ
，Ｎｂを０．０２％以上単独あるいは複合で含有させる
と、オーステナイト相に固溶して結晶粒を細粒化する作
用があり、そのため、強度延靭性及び冷間加工性が向上
するが、０．１５％を超えて過剰に添加するとフエライ
ト相を生威して、非磁性としての特性が減じられたり、
強固な炭窒化物を形成し、延性を滅しられるので、その
含有範囲を０．０２〜０．１５％に定めた。V: 0.02-0.15, Nb: 0.02-0.1
5% In the steel of the present invention, the C content can be lowered by adding Nb. That is, V
, Nb contained in an amount of 0.02% or more alone or in combination has the effect of forming a solid solution in the austenite phase and refining the crystal grains, thereby improving strength, ductility, and cold workability. If added in excess of .15%, a ferrite phase may develop, reducing the non-magnetic properties.
Since it forms strong carbonitrides and reduces ductility, its content range is set at 0.02 to 0.15%.
第１表に示す組威の１トン鋼塊を高周波講導炉にて熔製
した。第１表の供試材Ｎｏ． １〜Ｎｏ． ３は本発明
鋼であり、Ｎ０．４〜Ｎｏ． ５は従来調である。これ
らの鋼塊をｌ２００゜Ｃに加熱後リテーニングリングに
鍛造戒形し、粗削り後、アルゴン雰囲気中で１１００゜
Ｃに加熱して固溶化処理を施した。引続き、孔拡げによ
り、略、限界の冷間加工を施し、材料の強度を高めた。A 1-ton steel ingot having the weight shown in Table 1 was melted in a high-frequency induction furnace. Sample material No. in Table 1. 1~No. 3 is the steel of the present invention, No. 4 to No. 3. 5 is a conventional tone. These steel ingots were heated to 1200°C, forged into retaining rings, rough cut, and then heated to 1100°C in an argon atmosphere to undergo solid solution treatment. Subsequently, by enlarging the holes, we applied almost the limit of cold working to increase the strength of the material.
第１表に供試材の組戒と冷間加工後の肉厚中央部の機械
的性質を示すが、本発明鋼はいずれも、１４０ｋｇｆ
／ ｍｍ２以上の耐力を有する高強度非磁性鋼からなる
リテーニングリングを得ることができた。Table 1 shows the assembly of the test materials and the mechanical properties of the central part of the wall thickness after cold working.
A retaining ring made of high-strength non-magnetic steel and having a yield strength of /mm2 or more could be obtained.
以上説明した如く、本発明により、従来の１８Ｍｎ１８
Ｃｒ−Ｎ鋼よりもさらに高強度のりテーニング材が得ら
れ、発電効率の向上、発電機の軽量化、小型化等に大き
く寄与するものと確信する。As explained above, according to the present invention, the conventional 18Mn18
We are confident that we will be able to obtain a glue-taining material with even higher strength than Cr-N steel, which will greatly contribute to improving power generation efficiency and reducing the weight and size of generators.
Claims (1)
、Ｍｎ１５〜２５％、Ｎｉ１％以下、Ｃｒ１５〜２５％
以下、Ｎ０．４〜１．０％を含有し、さらにＶ０．０２
〜０．１５％、Ｎｂ０．０２〜０．１５％の少くとも１
種を含有し、残部がＦｅ及び不可避不純物からなる高強
度非磁性鋼。In weight percent, C 0.2% or less, Si 1.0% or less, Mn 15-25%, Ni 1% or less, Cr 15-25%
Below, it contains N0.4-1.0%, and further V0.02
~0.15%, at least 1 of Nb0.02~0.15%
A high-strength nonmagnetic steel containing seeds and the remainder consisting of Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1190672A JPH0356646A (en) | 1989-07-25 | 1989-07-25 | High strength nonmagnetic steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1190672A JPH0356646A (en) | 1989-07-25 | 1989-07-25 | High strength nonmagnetic steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0356646A true JPH0356646A (en) | 1991-03-12 |
Family
ID=16261972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1190672A Pending JPH0356646A (en) | 1989-07-25 | 1989-07-25 | High strength nonmagnetic steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0356646A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100358286B1 (en) * | 2000-10-13 | 2002-10-25 | 고려상사주식회사 | An overhead electric wire using high-nitrogen steel wire |
| JP2007039741A (en) * | 2005-08-03 | 2007-02-15 | Nippon Steel Corp | High-manganese stainless steel having superior stress corrosion cracking resistance |
| CN106884125A (en) * | 2017-03-31 | 2017-06-23 | 江苏星火特钢有限公司 | A kind of high-ductility super abrasive non-magnetic rustproof screen steel wire and preparation method thereof |
-
1989
- 1989-07-25 JP JP1190672A patent/JPH0356646A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100358286B1 (en) * | 2000-10-13 | 2002-10-25 | 고려상사주식회사 | An overhead electric wire using high-nitrogen steel wire |
| JP2007039741A (en) * | 2005-08-03 | 2007-02-15 | Nippon Steel Corp | High-manganese stainless steel having superior stress corrosion cracking resistance |
| CN106884125A (en) * | 2017-03-31 | 2017-06-23 | 江苏星火特钢有限公司 | A kind of high-ductility super abrasive non-magnetic rustproof screen steel wire and preparation method thereof |
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