JPH04193933A - High strength martensitic stainless steel having high corrosion resistance, production and use thereof - Google Patents
High strength martensitic stainless steel having high corrosion resistance, production and use thereofInfo
- Publication number
- JPH04193933A JPH04193933A JP2326324A JP32632490A JPH04193933A JP H04193933 A JPH04193933 A JP H04193933A JP 2326324 A JP2326324 A JP 2326324A JP 32632490 A JP32632490 A JP 32632490A JP H04193933 A JPH04193933 A JP H04193933A
- Authority
- JP
- Japan
- Prior art keywords
- strength
- stainless steel
- quenching
- corrosion
- martensitic stainless
- 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.)
- Granted
Links
- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 16
- 238000005260 corrosion Methods 0.000 title claims description 24
- 230000007797 corrosion Effects 0.000 title claims description 13
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 20
- 230000000717 retained effect Effects 0.000 claims abstract description 14
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 11
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 10
- 239000010935 stainless steel Substances 0.000 claims abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 238000010791 quenching Methods 0.000 claims description 25
- 230000000171 quenching effect Effects 0.000 claims description 25
- 238000005496 tempering Methods 0.000 claims description 14
- 229910000734 martensite Inorganic materials 0.000 claims description 11
- 238000011282 treatment Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 2
- 241000282342 Martes americana Species 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 16
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 10
- 230000009466 transformation Effects 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 9
- 230000001965 increasing effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000000523 sample Substances 0.000 description 7
- 238000010248 power generation Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 239000003205 fragrance Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910052735 hafnium Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Hydraulic Turbines (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、水力発電用水車ランナ及びガイドベーンなど
大型の鋳鋼品に係り、強度と靭性に優れ、かつ水中疲労
強度の高い高強度高耐食性マルテンサイト系ステンレス
鋼とその製造方法及び用途に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to large cast steel products such as water turbine runners and guide vanes for hydroelectric power generation, which have high strength and high corrosion resistance, excellent strength and toughness, and high underwater fatigue strength. This article relates to martensitic stainless steel and its manufacturing method and uses.
船舶用プロペラあるいは水力発電用水車ランナなど大型
で高い繰返し荷重を受ける部材は、耐食性の他、強度、
特に腐食疲労強度と靭性が要求されるため、耐食性が優
れていると同時に強度及び靭性に優れた種々の材料が開
発されてきた。Large parts that are subjected to high repeated loads, such as marine propellers or water turbine runners for hydroelectric power generation, have not only corrosion resistance but also strength and
In particular, since corrosion fatigue strength and toughness are required, various materials have been developed that have excellent corrosion resistance, as well as excellent strength and toughness.
例えば特公昭５１〜２９０８６号公報にはＣ；０．０７
％以下、Ｎ２；０．０５％以下、Ｓｉ；０．１〜２％、
Ｍｒ＋；０．１〜４％、Ｃｒ；１０〜１５％、Ｎｉ；２
〜７％、Ｍｏ；０．１〜３％、更にＴｉ、Ｔａ、Ｎｂの
１種以上を合計０．０１〜１％含み、残部Ｆｅ及び不純
物からなり、マルテンサイトとオーステナイトを主とす
る組織で、残留オーステナイト量が１０〜４５％、δフ
ェライト量が２０％以下である高い腐食疲労強度を有す
るプロペラ用大型ステンレス鋳鋼が開示されている。ま
た、特公昭６０−５３７３７号公報にはＣｏ０．０１〜
０．１５％、Ｓｉ；０．１〜１％、Ｍｎ；Ｑ、１〜２％
、Ｃｒ；１０−１５％、Ｎ１；２〜７％、Ｍｏ；０．１
〜３％、ｖ；０．０５−０．５％さらにＮｂ、Ｚｒ及び
Ｈｆの１種以上を０．００５〜０．５％含むことができ
、主としてマルテンサイトと残留オーステナイトとの混
合組織を有し、かつ残留オーステナイト量が１０〜４ｏ
％、δフェライト量が１ｏ％以下である水車ランナ用ス
テンレス鋳鋼が開示されている。更に他の従来例として
特開昭５８−８７２５７号公報が挙げられる。この公報
に開示されている鋳鋼はＣｒが２０．０〜３０．０％と
多く含まれているのが特徴である。For example, in Japanese Patent Publication No. 51-29086, C; 0.07
% or less, N2; 0.05% or less, Si; 0.1 to 2%,
Mr+; 0.1-4%, Cr; 10-15%, Ni; 2
-7%, Mo: 0.1-3%, and further contains one or more of Ti, Ta, and Nb in a total of 0.01-1%, with the balance consisting of Fe and impurities, with a structure mainly composed of martensite and austenite. , a large stainless steel cast steel for propellers having high corrosion fatigue strength and having a residual austenite content of 10 to 45% and a delta ferrite content of 20% or less is disclosed. In addition, in Japanese Patent Publication No. 60-53737, Co0.01~
0.15%, Si; 0.1-1%, Mn; Q, 1-2%
, Cr; 10-15%, N1; 2-7%, Mo; 0.1
~3%, v; 0.05-0.5% It can further contain 0.005-0.5% of one or more of Nb, Zr and Hf, and has a mixed structure mainly of martensite and retained austenite. and the amount of retained austenite is 10 to 4o
%, a stainless steel cast steel for a water turbine runner having an amount of 10% or less of ferrite is disclosed. Another conventional example is Japanese Patent Application Laid-Open No. 58-87257. The cast steel disclosed in this publication is characterized by a high Cr content of 20.0 to 30.0%.
ところで、近年電力需要の増大に伴ない、大型火力及び
原子力発電設備の建設と平行して水力発電においては、
夜間の予剰電力を利用して揚水し、ピーク時の電力供給
源としての揚水発電設備の建設が進められている。そし
て、その経済性を高めるために年々高揚程、高速化する
と共に大容量化する傾向にあり、強度、特に水中疲労強
度と靭性に優れた水車用部材の開発が望まれている。By the way, in recent years, with the increase in electricity demand, in parallel with the construction of large thermal power and nuclear power generation facilities, hydroelectric power generation has been increasing.
Construction is progressing on pumped storage power generation facilities that will pump water using surplus electricity at night and serve as a power supply source during peak hours. In order to improve its economic efficiency, there is a trend toward higher head, higher speed, and larger capacity year by year, and there is a desire to develop components for water turbines that have excellent strength, especially underwater fatigue strength and toughness.
上記特公昭５１〜２９０８６号公報のプロペラ用ステン
レス鋳鋼は、主として海水腐食疲労強度の改善を目的と
して開発された材料で、大型鋳塊を模擬した熱処理条件
では冷却速度が小さくひずみ取り焼純を行なっても靭性
が低いので高揚程水車ランナ用部材には適さない。また
、特公昭６０−５３７３７号公報の水車ランナ用ステン
レス鋳鋼は、良好な強度と靭性が得られているが、疲労
強度の詳細が記載されておらず、強度から腐食環境下で
の水中疲労強度を判断することは困難である。更に特開
昭５８−８７２５７号公報の鋳鋼はＣｒの含有量多いた
め、マルテンサイト系にはならない。The stainless steel cast steel for propellers disclosed in the above-mentioned Japanese Patent Publication No. 51-29086 is a material developed primarily for the purpose of improving seawater corrosion fatigue strength, and under heat treatment conditions simulating large ingots, the cooling rate is low and strain relief sintering is performed. However, it has low toughness, so it is not suitable for high-head water turbine runner members. In addition, the stainless steel cast steel for water turbine runners disclosed in Japanese Patent Publication No. 60-53737 has good strength and toughness, but the details of fatigue strength are not described, and the underwater fatigue strength in a corrosive environment is not described based on the strength. It is difficult to judge. Furthermore, since the cast steel disclosed in JP-A-58-87257 has a high Cr content, it does not become martensitic.
本発明の目的は、上記ステンレス鋳鋼と同等の強度を有
し、さらに水中疲労強度と靭性に優れた高強度高耐食性
マルテンサイト系ステンレス鋼とその製造方法及び用途
を提供することにある。An object of the present invention is to provide a high-strength, high-corrosion-resistant martensitic stainless steel that has strength equivalent to the above-mentioned stainless steel cast steel and has excellent underwater fatigue strength and toughness, as well as its manufacturing method and uses.
上記目的を達成するため、本発明に係る部材は１２〜１
７％のＣｒ及び３〜７％のＮｉを含むマルテンサイト系
ステンレス鋳鋼において、ＣＯがＭＯ及びＶの溶解度を
増加させ、また、Ｇｏは変態点に及ぼす影響が小さく熱
処理によって強度を損なうことなく水中疲労強度と靭性
を改善する上で好適であり、さらに焼入性を増すための
補助作用としてＢが有益な成分であることを見い出して
完成されたものである。In order to achieve the above object, the member according to the present invention has 12 to 1
In martensitic stainless steel cast steel containing 7% Cr and 3-7% Ni, CO increases the solubility of MO and V, and Go has a small effect on the transformation point and can be heated in water without losing strength by heat treatment. This was completed after discovering that B is a beneficial component that is suitable for improving fatigue strength and toughness, and also has an auxiliary effect for increasing hardenability.
すなわち、本発明は、重量で、Ｃ；０．０１〜０．１０
％＋ Ｓ ｉ； Ｏ−１〜１〜５％、 Ｍ ｎ ；０．
１〜２．０％、Ｃｒ；１２−１７％、Ｎｉ；３〜７％、
Ｃｏ；０．１〜３％、Ｍｏ；０．１〜２．０％、Ｖ；０
．０５−０．．５％を含有し、残部がＦｅ及び不可避的
不純物からなることを特徴とする高強度高耐食性マルテ
ンサイト系ステンレス鋼である。That is, in the present invention, by weight, C: 0.01 to 0.10
%+Si; O-1 to 1 to 5%, Mn; 0.
1-2.0%, Cr; 12-17%, Ni; 3-7%,
Co; 0.1-3%, Mo; 0.1-2.0%, V; 0
．． 05-0. ．． This is a high-strength, high-corrosion-resistant martensitic stainless steel characterized by containing 5% Fe and the remainder consisting of Fe and unavoidable impurities.
また１本発明は、重量で、Ｃ；０．０１〜０．１０％＋
Ｓ １； ０．１〜１．５％ｌ Ｍ ｎ ；０．１〜
２．０％、Ｃｒ；１２〜１７％＋ Ｎｌ ；３〜７％、
Ｃｏ ； ０．１〜３％、Ｍｏ；０．１〜２．０％、ｖ
；０．０５〜０．５％、Ｂ；０．０００５〜０．０１％
を含有し、残部がＦｅ及び不可避的不純物からなること
を特徴とする高強度高耐食性マルテンサイト系ステンレ
ス鋼である。In addition, one aspect of the present invention is that, by weight, C; 0.01 to 0.10% +
S1; 0.1~1.5%l Mn; 0.1~
2.0%, Cr; 12-17% + Nl; 3-7%,
Co; 0.1-3%, Mo; 0.1-2.0%, v
;0.05-0.5%, B;0.0005-0.01%
This is a high-strength, high-corrosion-resistant martensitic stainless steel characterized by containing: Fe and unavoidable impurities.
前記ステンレス鋼において、主としてマルテンサイト組
織を有し、残留オーステナイト量が容積比で２０％以下
、δフェライト量が面積比で１５％以下であるものがよ
い。また、主としてマルテンサイトと残留オーステナイ
トから成る混合組織を有し、かつ残留オーステナイト量
が容積比で３５％以下、δフェライト量が面積比で１５
％以下であるものがよい。The stainless steel preferably has a mainly martensitic structure, the amount of retained austenite is 20% or less in volume ratio, and the amount of δ ferrite is 15% or less in area ratio. In addition, it has a mixed structure mainly consisting of martensite and retained austenite, and the amount of retained austenite is 35% or less in volume ratio, and the amount of δ ferrite is 15% in area ratio.
% or less is better.
また、本発明は、重量で、Ｃ；０．０１〜０．１０％、
Ｓｉ；０．１〜１．５％、Ｍｎ；０．１〜２．０％、Ｃ
ｒ；１２〜１７％、Ｎｉ；３〜７％、Ｃｏ；０．１〜３
％２ＭＯ；０．１〜２．０％、Ｖ；０．０５〜０．５％
、を含有し、残部がＦｅ及び不可避的不純物からなる組
成物をＡｃ３点以上の温度で焼入れする工程と、その工
程に次いでＡｃ１とＡｃ、との間の温度で少なくとも１
回中間焼入れする工程と、その工程に次いでＡｃ工以下
の温度で焼もどしする工程とを含むことを特徴とする高
強度高耐食性マルテンサイト系ステンレス鋼の製造方法
である。In addition, the present invention provides C; 0.01 to 0.10% by weight,
Si; 0.1-1.5%, Mn; 0.1-2.0%, C
r: 12-17%, Ni: 3-7%, Co: 0.1-3
%2MO; 0.1-2.0%, V; 0.05-0.5%
, with the remainder consisting of Fe and unavoidable impurities, at a temperature of Ac 3 or higher, and then at least 1 at a temperature between Ac 1 and Ac.
This is a method for producing a high-strength, high-corrosion-resistant martensitic stainless steel, which is characterized by comprising a step of intermediate quenching, and then a step of tempering at a temperature below Ac processing.
また、本発明は、重量で、Ｃ；０．０１〜０．１０％、
Ｓｉ ；０．１〜１．５％、Ｍｎ；０．１〜２．０％、
Ｃｒ；１２〜１７％、Ｎｉ；３〜７％、Ｃｏ；０．１〜
３％、Ｍｏ；０．１〜２．０％、Ｖ；０．０５〜０．５
％、Ｂ；０．０ｏＯ５〜０．０１％を含有し、残部がＦ
ｅ及び不可避的不純物からなる組成物をＡｃ，点以上の
温度で焼入れする工程と、その工程に次いでＡｃｍとＡ
ｃ３との間の温度で少なくとも１回中間焼入れする工程
と、その工程に次いでＡｃ１以下の温度で焼もどしする
工程とを含むことを特徴とする高強度高耐食性マルテン
サイト系ステンレス鋼の製造方法である。In addition, the present invention provides C; 0.01 to 0.10% by weight,
Si; 0.1 to 1.5%, Mn; 0.1 to 2.0%,
Cr: 12-17%, Ni: 3-7%, Co: 0.1-
3%, Mo; 0.1-2.0%, V; 0.05-0.5
%, B; Contains 0.0oO5-0.01%, the balance is F
A step of quenching the composition consisting of e and unavoidable impurities at a temperature above the A cm point, and then quenching the composition consisting of A cm and A
A method for producing high-strength, highly corrosion-resistant martensitic stainless steel, the method comprising the steps of intermediate quenching at least once at a temperature between Ac1 and C3, and subsequent tempering at a temperature of Ac1 or below. be.
また、本発明は、クラウンと、これと対向するシュラウ
ドリングと、クラウンとシュラウドリング間に複数設け
られた羽根とが一体に形成されている水車ランナにおい
て、前記各構成部材が前記のいずれかの高強度高耐食性
マルテンサイト系ステンレス鋼で形成されていることを
特徴とする水車ランナである。The present invention also provides a water turbine runner in which a crown, a shroud ring opposing the crown, and a plurality of blades provided between the crown and the shroud ring are integrally formed, in which each of the constituent members is one of the above-mentioned components. This water turbine runner is characterized by being made of high-strength, high-corrosion-resistant martensitic stainless steel.
すなわち、本発明からなる部材は、通常の焼入れ、焼も
どし処理においても十分な強度と靭性を得ることができ
るが、焼入れ、焼もどしの間でＡｃよとＡ Ｃ３変態区
間のα＋γの２相温度から中間焼入処理を施こすことに
より、析出γ相のＭｓ点をさほど低下させることなく微
細なマルテンサイトが得られ、より優れた水中疲労強度
と靭性とを付与することができる。That is, the member made of the present invention can obtain sufficient strength and toughness even in normal quenching and tempering treatments, but during quenching and tempering, the two-phase temperature of α + γ in the AC and A C3 transformation zones By performing an intermediate quenching treatment, fine martensite can be obtained without significantly lowering the Ms point of the precipitated γ phase, and better underwater fatigue strength and toughness can be imparted.
なお、強度と靭性との兼ね合から、通常の焼入れ、焼も
どし処理では主としてマルテンサイトと残留オーステナ
イトとの混合組織を有し、残留オーステナイト量が容積
比で１０〜３５％、δフェライト量が面積比で１５％以
下、また、焼入れ、焼もどし処理の間にＡｃよとＡｃ、
変態からの２次焼入処理を施こした場合は主としてマル
テンサイト組織を有し、残留オーステナイト量が容積比
で２０％以下、δフェライト量が面積比で１５％以下に
なるよう成分及び熱処理によって調整される。In addition, due to the balance between strength and toughness, in normal quenching and tempering treatments, a mixed structure of martensite and retained austenite is mainly formed, and the amount of retained austenite is 10 to 35% by volume, and the amount of δ ferrite is reduced by area. In addition, during quenching and tempering treatment, Ac
When the secondary quenching treatment from transformation is performed, it mainly has a martensitic structure, and the composition and heat treatment are adjusted so that the amount of retained austenite is 20% or less in volume ratio and the amount of δ ferrite is 15% or less in area ratio. be adjusted.
次に本発明からなる部材の化学成分の限定理由を述べる
。Next, the reasons for limiting the chemical components of the member made of the present invention will be described.
まずＣは、０．１％以上では耐食性、靭性及び溶接性を
悪くするので、上限を０．１％とし、強度及び溶解上の
点から０．０１％以上に規制される。好ましくは０．０
３〜０．０６％である。First, C deteriorates corrosion resistance, toughness, and weldability when it exceeds 0.1%, so the upper limit is set at 0.1%, and from the viewpoint of strength and dissolution, it is restricted to 0.01% or more. Preferably 0.0
It is 3 to 0.06%.
Ｓｉは、製鋼時の脱酸剤として０．１％以上必要である
が、靭性の点から１．５％以下に限定される。好ましく
は０．２〜０．７％である。Si is required to be 0.1% or more as a deoxidizing agent during steel manufacturing, but is limited to 1.5% or less from the viewpoint of toughness. Preferably it is 0.2 to 0.7%.
Ｍｎもやはり脱酸剤として用いられるが、オーステナイ
ト化元素として靭性に寄与するので、２％まで添加する
のが適当である。好ましくは０．３〜０．９％である。Mn is also used as a deoxidizing agent, but since it contributes to toughness as an austenitizing element, it is appropriate to add up to 2%. Preferably it is 0.3 to 0.9%.
Ｃｒは、ステンレス鋼において耐食性を高める最も重要
な成分であり、特に水中疲労強度の点から１２％以上必
要である。Ｃｒ量が増加すると耐食性は向上するが、δ
フェライトが生成して脆化し易くなり靭性を害し、水中
疲労強度も高くならないので上限は１７％に規制する。Cr is the most important component for increasing corrosion resistance in stainless steel, and in particular, 12% or more is required from the viewpoint of underwater fatigue strength. Corrosion resistance improves as the amount of Cr increases, but δ
The upper limit is regulated to 17% because ferrite is generated and easily becomes brittle, impairing toughness and does not increase the underwater fatigue strength.
好ましくは１３〜１６％である。Preferably it is 13 to 16%.
Ｎｉは、強力なオーステナイト形成元素であり、靭性及
び補修溶接時の溶接性向上のため少なくとも３％以上必
要である。しかし、７％以上Ｎｉを含有すると焼入れ及
びＡｃ工とＡｃ３変態区間からの２次焼入処理において
Ｍｓ点が低下し、残留オーステナイト量を増し耐力及び
水中疲労強度が得られない。従って好ましくは４〜６％
である。Ni is a strong austenite-forming element and is required in an amount of at least 3% to improve toughness and weldability during repair welding. However, if 7% or more of Ni is contained, the Ms point decreases in quenching and secondary quenching from the Ac processing and Ac3 transformation sections, increases the amount of retained austenite, and yield strength and underwater fatigue strength cannot be obtained. Therefore, preferably 4 to 6%
It is.
Ｃｏは、オーステナイト形成元素で、その効果はＮｉに
比べ小さいが、焼入に際してＭＯ及び■のオーステナイ
トへの溶解度を増してマトリックスを強化する。また、
ＡｃよとＡ （３変態区間からの２次焼入処理時の冷却
に際して、逆変態によって生成したオーステナイトのＭ
ｓ点をさほど低下させることなく微細なマルテンサイト
を得る上で不可欠な成分である。ＣＯの添加量はＮｉ量
との兼ね合いで決定されるが、０．１％以下ではその効
果は小さく、多量に添加するとオーステナイトを安定化
しその効果を十分発揮することができないので上限を３
％とする。好ましくは０．２〜２％である。Co is an austenite-forming element, and although its effect is smaller than that of Ni, it strengthens the matrix by increasing the solubility of MO and (2) in austenite during quenching. Also,
Ac and A (M of austenite generated by reverse transformation during cooling during secondary quenching from the 3rd transformation section)
It is an essential component in obtaining fine martensite without significantly lowering the s-point. The amount of CO added is determined based on the balance with the amount of Ni, but if it is less than 0.1%, the effect is small, and if it is added in a large amount, it will stabilize austenite and the effect cannot be fully demonstrated, so the upper limit is set at 3%.
%. Preferably it is 0.2 to 2%.
Ｍｏは、耐食性を高めると同時に中間焼入れ及び焼もど
し処理において、マトリックスの軟化を抑制して強度向
上にも有効な成分であり、かつ焼もとし脆化の防止にも
最適である。しかし、３％を越えると強度向上もさるこ
となからδフェライト量を増し靭性低下が著しいので０
．１〜３％に規制される。好ましくは０．３〜２％であ
る。Mo is an effective component for enhancing corrosion resistance and at the same time suppressing softening of the matrix during intermediate quenching and tempering treatments to improve strength, and is also optimal for preventing embrittlement due to tempering. However, if it exceeds 3%, the amount of δ ferrite increases and the toughness decreases significantly, even though the strength does not improve.
．． It is regulated at 1-3%. Preferably it is 0.3 to 2%.
■は、強力な炭化物形成元素として知られているが、Ｃ
ｒ炭化物、窒化物の析出を抑制し、徐冷脆化を抑制する
とともに、焼もどし過程で二次硬化を起し強度を高める
働きがある。しかし、０．５％以上では偏析の問題を生
じ、また靭性が低下するので０．５％以下がよい。■の
効果を期待するためには０．０５％以上必要であり、０
．０５〜０．５％に規制される。好ましくは０．１〜０
．３％である。■ is known as a strong carbide-forming element, but C
It has the function of suppressing precipitation of r-carbides and nitrides, suppressing slow cooling embrittlement, and causing secondary hardening in the tempering process to increase strength. However, if it is more than 0.5%, problems of segregation will occur and the toughness will be reduced, so it is preferably less than 0.5%. ■In order to expect the effect of 0.05% or more, 0.05% or more is required.
．． It is regulated to 0.05% to 0.5%. Preferably 0.1-0
．． It is 3%.
Ｂは、焼入性を増すほか、■との複合添加によって結晶
粒を微細化し、強度及び靭性を改善するが、その量を増
すと清浄度が低下し脆化を招くので上限は０．０１％と
し、好ましくは０．０００７〜０．００２％である。In addition to increasing hardenability, B refines the crystal grains and improves strength and toughness when added in combination with (2), but increasing its amount reduces cleanliness and causes embrittlement, so the upper limit is 0.01. %, preferably 0.0007 to 0.002%.
残部は、Ｆｅ及び同伴する不純物からなり、不純物とし
てＰ、Ｓ及びその他Ａｓ、Ｓｂなどがあるが、これらの
元素は延性、靭性を害するとともに溶接性を低下させる
ため極力少ない方が望ましい。The remainder consists of Fe and accompanying impurities, including P, S, and others such as As and Sb, but these elements impair ductility and toughness and reduce weldability, so it is desirable to have as little as possible.
さらに、本発明に係る部材はＺｒ、ＨｆのＭＣ型炭化物
形成元素の１種以上を０．５％以下含有させることによ
り強度を高めることができる。特にこれらの元素は０．
２％以下が望ましい。更に、部材の延性を高めるために
Ｃａ 、 Ｍ ｇ、希土類元素、Ｙ等の酸化剤を加える
ことができる。それらの１種又は２種以上の含有量を０
．３％以下にすることが望ましい。Furthermore, the strength of the member according to the present invention can be increased by containing 0.5% or less of one or more of MC type carbide forming elements such as Zr and Hf. In particular, these elements are 0.
2% or less is desirable. Furthermore, oxidizing agents such as Ca, Mg, rare earth elements, and Y can be added to increase the ductility of the member. The content of one or more of them is 0.
．． It is desirable to keep it below 3%.
以下、本発明を実施例によりさらに詳細に説明する。 Hereinafter, the present invention will be explained in more detail with reference to Examples.
第１図は、本発明からなる部材が適用される水車ランナ
の断面図である。同図において、クラウン２とシュラウ
ドリング４の間に複数の羽根３が設けられている。クラ
ウン２の中心は駆動軸が連結されているが、この肉厚の
部分は特にクラウンボス１とよばれる。これらの水車ラ
ンナ（またはポンプ水車）は主に一体鋳造で鋳込まれる
か、または各部材毎に鋳込み後に溶接接合するか、いず
れかの製造方法がとられる。また、第２図は、ガイドベ
ーンの概略斜視図である。同図において、ガイドベーン
５は駆動用のステム６と一体化されており、これらは一
体鋳造で鋳込まれる。FIG. 1 is a sectional view of a water turbine runner to which the member of the present invention is applied. In the figure, a plurality of blades 3 are provided between the crown 2 and the shroud ring 4. A drive shaft is connected to the center of the crown 2, and this thick part is particularly called the crown boss 1. These water turbine runners (or pump water turbines) are manufactured mainly by integral casting, or by welding and joining each member after casting. Moreover, FIG. 2 is a schematic perspective view of the guide vane. In the figure, the guide vane 5 is integrated with a driving stem 6, and these are integrally cast.
表１に試験に供した材料の化学成分を示す。賦香１〜４
が比較材料であり、賦香５〜９が本発明材料である。Table 1 shows the chemical components of the materials used in the test. Incense 1-4
are comparative materials, and fragrances 5 to 9 are materials of the present invention.
これらは高周波炉で大気溶解し、３０ｋｇ砂型に鋳造し
た。鋳造後いずれの試料も組成の均質化を図るため１０
００℃で拡散焼なましを行なった。These were melted in the atmosphere in a high frequency furnace and cast into a 30 kg sand mold. After casting, all samples were heated to 10% to homogenize the composition.
Diffusion annealing was performed at 00°C.
第３図は供試材の熱処理線図を示す。図において、同図
（ａ）は比較材である賦香１〜４における熱処理線図で
あり、Ａｃ３点以上の１０００’Ｃから焼入れ後、Ａｃ
工点点付近６００ ’Ｃで焼もどしを行なった。同図（
ｂ）は本発明材の熱処理線図であり、比較材と同じ１０
００℃から焼入後、Ａｃ１とＡｃ、変態区間の７６０℃
から２次焼入れし、引続きＡｃ１以下の５６０℃で焼き
もどしを行なった。FIG. 3 shows a heat treatment diagram of the sample material. In the figure, (a) is a heat treatment diagram for comparison materials Nos. 1 to 4, and after quenching from 1000'C at 3 Ac points
Tempering was performed at 600'C near the work point. Same figure (
b) is a heat treatment diagram of the present invention material, which is the same as the comparative material.
After quenching from 00℃, Ac1 and Ac, 760℃ in the transformation zone
It was then subjected to secondary quenching, followed by tempering at 560° C. below Ac1.
焼入れ及び２次焼入時の冷却速度は６００’Ｃ／ｈであ
り、これは実機ランナを強襲冷却した場合の冷却速度に
近い。The cooling rate during quenching and secondary quenching is 600'C/h, which is close to the cooling rate when the actual runner is forced cooled.
表２に供試材料の機械的性質及び水中疲労強度を示す。Table 2 shows the mechanical properties and underwater fatigue strength of the test materials.
なお、表２には１０００ ’Ｃから焼入処理を施こした
試料を用い、３００’Ｃ／ｈで加熱、冷却したときの熱
膨張計から求めた変態点、また、調質後の残留オーステ
ナイト量を併記した。すなわち、変態点は試料の成分、
加熱速度、保持時間等により変わるため、この表２に示
した変態点の値は絶対的なものではなく、特定の熱処理
条件下での値である。水中疲労試験は、回転回げ疲労試
験機を用い、試験片中央部に水道水を滴下し、１０８回
疲労強度を求めた。In addition, Table 2 shows the transformation point determined from a thermal dilatometer when heated and cooled at 300'C/h using a sample quenched from 1000'C, and the residual austenite after tempering. The amount is also listed. In other words, the transformation point depends on the components of the sample,
The transformation point values shown in Table 2 are not absolute values because they vary depending on the heating rate, holding time, etc., but are values under specific heat treatment conditions. In the underwater fatigue test, tap water was dropped onto the center of the test piece using a rotary fatigue tester, and the fatigue strength was determined 108 times.
表１及び表２において、１３％Ｃｒ−５％Ｎｉ鋳鋼にＭ
ｏを少量添加した賦香１は残留オーステナイト量が最も
多く衝撃値は高いが、引張強さ及び水中疲労強度は低い
。賦香２はＭＯ添加量を増し、さらにＮｂを添加した試
料であり、引張強さ及び疲労強度は改善されているが、
衝撃値は７．６ｋｇｆ−ｍ／ａｎ２で低い。賦香３はＭ
ＯとＶを複合添加した試料であり、賦香２と同等以上の
強度を有し、水中疲労強度及び衝撃値が改善されている
が、水中疲労強度及び靭性の向上がより望まれる。賦香
４はＣｒを１５％と増し、Ｍｏを１．５％添加した試料
であり、水中疲労強度は３５ｋｇｆ／ｍｍ２が得られて
いるが、十分な強度と靭性は得られていない。In Tables 1 and 2, M was applied to 13%Cr-5%Ni cast steel.
Perfume 1 with a small amount of o added has the largest amount of retained austenite and has a high impact value, but its tensile strength and underwater fatigue strength are low. Flavoring 2 is a sample in which the amount of MO added was increased and Nb was further added, and the tensile strength and fatigue strength were improved, but
The impact value is low at 7.6 kgf-m/an2. Incense 3 is M
This is a sample with a combination of O and V added, and has a strength equal to or higher than that of Fragrance 2, and has improved underwater fatigue strength and impact value, but improvements in underwater fatigue strength and toughness are more desired. Flavoring 4 is a sample in which Cr was increased to 15% and Mo was added to 1.5%, and although an underwater fatigue strength of 35 kgf/mm2 was obtained, sufficient strength and toughness were not obtained.
上記に対して、賦香５〜９が本発明材である。In contrast to the above, fragrances 5 to 9 are materials of the present invention.
本発明材は強度が最も高い比較材賦香２及び３より、０
．２％耐力が若干低いが、引張強さはほぼ同等で、水中
疲労強度は３８〜４１ｋｇｆ／ｍｍ２で比較材よりいず
れも高く、また、衝撃値は１２ｋｇｆ−ｍ／ａ＆以上が
得られており、比較材と同等の強度を有し、水中疲労強
度及び延在、靭性が優れていることが明瞭である。The material of the present invention has a lower strength than the comparative materials 2 and 3, which have the highest strength.
．． Although the 2% yield strength is slightly lower, the tensile strength is almost the same, the underwater fatigue strength is 38 to 41 kgf/mm2, which is higher than the comparative materials, and the impact value is 12 kgf-m/a& more. It is clear that it has the same strength as the comparative material and is superior in underwater fatigue strength, elongation, and toughness.
本発明による水車用部材は通常の電弧炉あるいは高周波
誘導炉等により容易に溶解、鋳込みができ、水車ランナ
及びガイドベーンの製造上特別な方法を必要としない。The water turbine member according to the present invention can be easily melted and cast in an ordinary electric arc furnace or high frequency induction furnace, and no special method is required for manufacturing the water turbine runner and guide vane.
なお、ＶＯＤ処理等を施こし不純物（ｐ、ｓ等）及び非
金属介在物（Ｓｉｎ。Note that impurities (P, S, etc.) and nonmetallic inclusions (Sin, etc.) are removed by VOD treatment.
等）の低減により、更に優れた特性を得ることが出来る
。etc.), even better characteristics can be obtained.
本発明によれば、従来材料と比較して、強度、特に水中
疲労強度と靭性に優れた高強度高耐食性マルテンサイト
系ステンレス鋼を提供することができ、特に落差の大き
い揚水型発電用水車ランナ及びガイドベーン等の水車部
材として好適に用いることができる。According to the present invention, it is possible to provide a high-strength, high-corrosion-resistant martensitic stainless steel that has superior strength, particularly underwater fatigue strength and toughness, compared to conventional materials, and is particularly suitable for use in pumped-storage power generation water turbine runners with large heads. It can also be suitably used as a water wheel member such as a guide vane.
第１図は水車ランナの構造を示す概略断面図、第２図は
ガイドベーンの斜視図、第３図は供試材の熱処理を示す
線図である。
１・・・クラウンボス、２・・・クラウン、３・・・羽
根、４°゛°シユラウドリング、５・・・ガイドベーン
、６・・・ステム。FIG. 1 is a schematic sectional view showing the structure of a water turbine runner, FIG. 2 is a perspective view of a guide vane, and FIG. 3 is a diagram showing heat treatment of a sample material. 1... Crown boss, 2... Crown, 3... Vane, 4°゛° shroud ring, 5... Guide vane, 6... Stem.
Claims (1)
〜１．５％、Ｍｎ；０．１〜２．０％、Ｃｒ；１２〜１
７％、Ｎｉ；３〜７％、Ｃｏ；０．１〜３％、Ｍｏ；０
．１〜２．０％、Ｖ；０．０５〜０．５％を含有し、残
部がＦｅ及び不可避的不純物からなることを特徴とする
高強度高耐食性マルテンサイト系ステンレス鋼。 ２、重量で、Ｃ；０．０１〜０．１０％、Ｓｉ；０．１
〜１．５％、Ｍｎ；０．１〜２．０％、Ｃｒ；１２〜１
７％、Ｎｉ；３〜７％、Ｃｏ；０．１〜３％、Ｍｏ；０
．１〜２．０％、Ｖ；０．０５〜０．５％、Ｂ；０．０
００５〜 ０．０１％を含有し、残部がＦｅ及び不可避的不純物か
らなることを特徴とする高強度高耐食性マルテンサイト
系ステンレス鋼。 ３、請求項１又は２において、主としてマルテンサイト
組織を有し、残留オーステナイト量が容積比で２０％以
下、δフェライト量が面積比で１５％以下であることを
特徴とする高強度高耐食性マルテンサイト系ステンレス
鋼。 ４、請求項１又は２において、主としてマルテンサイト
と残留オーステナイトから成る混合組織を有し、かつ残
留オーステナイト量が容積比で３５％以下、δフェライ
ト量が面積比で１５％以下であることを特徴とする高強
度高耐食性マルテンサイト系ステンレス鋼。 ５、重量で、Ｃ；０．０１〜０．１０％、Ｓｉ；０．１
〜１．５％、Ｍｎ；０．１〜２．０％、Ｃｒ；１２〜１
７％、Ｎｉ；３〜７％、Ｃｏ；０．１〜３％、Ｍｏ；０
．１〜２．０％、Ｖ；０．０５〜０．５％を含有し、残
部がＦｅ及び不可避的不純物からなる組成物をＡｃ＿３
点以上の温度で焼入れする工程と、その工程に次いでＡ
ｃ＿１とＡｃ＿３との間の温度で少なくとも一回中間焼
入れする工程と、その工程に次いでＡｃ＿１以下の温度
で焼もどしする工程とを含むことを特徴とする高強度高
耐食性マルテンサイト系ステンレス鋼の製造方法。 ６、重量で、Ｃ；０．０１〜０．１０％、Ｓｉ；０．１
〜１．５％、Ｍｎ；０．１〜２．０％、Ｃｒ；１２〜１
７％、Ｎｉ；３〜７％、Ｃｏ；０．１〜３％、Ｍｏ；０
．１〜２．０％、Ｖ；０．０５〜０．５％、Ｂ；０．０
００５〜 ０．０１％を含有し、残部がＦｅ及び不可避的不純物か
らなる組成物をＡｃ＿３点以上の温度で焼入れする工程
と、その工程に次いでＡｃ＿１とＡｃ＿３との間の温度
で少なくとも１回中間焼入れする工程と、その工程に次
いでＡｃ＿１以下の温度で焼もどしする工程とを含むこ
とを特徴とする高強度高耐食性マルテンサイト系ステン
レス鋼の製造方法。 ７、クラウンと、これと対向するシュラウドリングと、
クラウンとシュラウドリング間に複数設けられた羽根と
が一体に形成されている水車ランナにおいて、前記各構
成部材が請求項１〜４のいずれかの高強度高耐食性マル
テンサイト系ステンレス鋼で形成されていることを特徴
とする水車ランナ。[Claims] 1. By weight, C: 0.01 to 0.10%, Si: 0.1
~1.5%, Mn; 0.1-2.0%, Cr; 12-1
7%, Ni; 3-7%, Co; 0.1-3%, Mo; 0
．． 1 to 2.0%, V; 0.05 to 0.5%, and the remainder consists of Fe and inevitable impurities. 2. By weight, C: 0.01-0.10%, Si: 0.1
~1.5%, Mn; 0.1-2.0%, Cr; 12-1
7%, Ni; 3-7%, Co; 0.1-3%, Mo; 0
．． 1-2.0%, V; 0.05-0.5%, B; 0.0
A high-strength, high-corrosion-resistant martensitic stainless steel characterized by containing 0.005 to 0.01%, with the remainder consisting of Fe and inevitable impurities. 3. The high-strength, highly corrosion-resistant marten according to claim 1 or 2, which mainly has a martensitic structure, has a retained austenite content of 20% or less in volume ratio, and a δ ferrite content of 15% or less in area ratio. Site stainless steel. 4. Claim 1 or 2, characterized in that it has a mixed structure mainly consisting of martensite and retained austenite, and the amount of retained austenite is 35% or less in volume ratio, and the amount of δ ferrite is 15% or less in area ratio. High-strength, high-corrosion-resistant martensitic stainless steel. 5. By weight, C: 0.01-0.10%, Si: 0.1
~1.5%, Mn; 0.1-2.0%, Cr; 12-1
7%, Ni; 3-7%, Co; 0.1-3%, Mo; 0
．． Ac_3
A step of quenching at a temperature above point, followed by a step of quenching at a temperature above point
Production of high-strength, high-corrosion-resistant martensitic stainless steel characterized by comprising a step of intermediate quenching at least once at a temperature between c_1 and Ac_3, and then a step of tempering at a temperature of Ac_1 or less. Method. 6. By weight, C: 0.01-0.10%, Si: 0.1
~1.5%, Mn; 0.1-2.0%, Cr; 12-1
7%, Ni; 3-7%, Co; 0.1-3%, Mo; 0
．． 1-2.0%, V; 0.05-0.5%, B; 0.0
005 to 0.01%, with the balance consisting of Fe and unavoidable impurities, a step of quenching the composition at a temperature of Ac_3 point or higher, and then an intermediate treatment at least once at a temperature between Ac_1 and Ac_3. A method for producing a high-strength, high-corrosion-resistant martensitic stainless steel, comprising the steps of quenching, and then tempering at a temperature of Ac_1 or lower. 7. The crown and the shroud ring facing it,
In a water turbine runner in which a plurality of blades provided between a crown and a shroud ring are integrally formed, each of the constituent members is formed of the high-strength and high-corrosion-resistant martensitic stainless steel according to any one of claims 1 to 4. A water wheel runner characterized by the fact that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2326324A JP2678263B2 (en) | 1990-11-28 | 1990-11-28 | High-strength and high-corrosion-resistant martensitic stainless steel manufacturing method and its application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2326324A JP2678263B2 (en) | 1990-11-28 | 1990-11-28 | High-strength and high-corrosion-resistant martensitic stainless steel manufacturing method and its application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04193933A true JPH04193933A (en) | 1992-07-14 |
| JP2678263B2 JP2678263B2 (en) | 1997-11-17 |
Family
ID=18186499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2326324A Expired - Fee Related JP2678263B2 (en) | 1990-11-28 | 1990-11-28 | High-strength and high-corrosion-resistant martensitic stainless steel manufacturing method and its application |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2678263B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100441051B1 (en) * | 2001-08-09 | 2004-07-21 | 두산중공업 주식회사 | Martensitic Stainless Steel having high-strength and excellent erosion resistance |
| CN109082608A (en) * | 2018-10-26 | 2018-12-25 | 成都先进金属材料产业技术研究院有限公司 | The method for controlling delta ferrite level in low straight-chromiun stainless steel |
| CN115572902A (en) * | 2022-09-30 | 2023-01-06 | 吉林建龙钢铁有限责任公司 | Steel for integrated wheel hub and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411245A (en) * | 1977-06-28 | 1979-01-27 | Organo Kk | Treatment of sugar solution |
| JPS5558353A (en) * | 1978-10-20 | 1980-05-01 | Hitachi Ltd | Stainless cast steel for hydraulic turbine runner |
| JPS62124218A (en) * | 1985-08-27 | 1987-06-05 | Nisshin Steel Co Ltd | Manufacture of high strength stainless steel material having superior workability without softening by welding |
| JPH01119649A (en) * | 1987-11-02 | 1989-05-11 | Daido Steel Co Ltd | Corrosion-resisting stainless steel having high strength and high toughness |
-
1990
- 1990-11-28 JP JP2326324A patent/JP2678263B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411245A (en) * | 1977-06-28 | 1979-01-27 | Organo Kk | Treatment of sugar solution |
| JPS5558353A (en) * | 1978-10-20 | 1980-05-01 | Hitachi Ltd | Stainless cast steel for hydraulic turbine runner |
| JPS62124218A (en) * | 1985-08-27 | 1987-06-05 | Nisshin Steel Co Ltd | Manufacture of high strength stainless steel material having superior workability without softening by welding |
| JPH01119649A (en) * | 1987-11-02 | 1989-05-11 | Daido Steel Co Ltd | Corrosion-resisting stainless steel having high strength and high toughness |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100441051B1 (en) * | 2001-08-09 | 2004-07-21 | 두산중공업 주식회사 | Martensitic Stainless Steel having high-strength and excellent erosion resistance |
| CN109082608A (en) * | 2018-10-26 | 2018-12-25 | 成都先进金属材料产业技术研究院有限公司 | The method for controlling delta ferrite level in low straight-chromiun stainless steel |
| CN115572902A (en) * | 2022-09-30 | 2023-01-06 | 吉林建龙钢铁有限责任公司 | Steel for integrated wheel hub and preparation method thereof |
| CN115572902B (en) * | 2022-09-30 | 2023-08-22 | 吉林建龙钢铁有限责任公司 | Integrated steel for wheel hub and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2678263B2 (en) | 1997-11-17 |
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