JPS61170510A - Manufacture of 13cr cast steel containing ni - Google Patents
Manufacture of 13cr cast steel containing niInfo
- Publication number
- JPS61170510A JPS61170510A JP1203685A JP1203685A JPS61170510A JP S61170510 A JPS61170510 A JP S61170510A JP 1203685 A JP1203685 A JP 1203685A JP 1203685 A JP1203685 A JP 1203685A JP S61170510 A JPS61170510 A JP S61170510A
- Authority
- JP
- Japan
- Prior art keywords
- cast steel
- steel
- tempering
- ni13cr
- normalizing
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は含Ｎｊ１３Ｃｒ鋳鋼の製造法に係シ、特に鋳鋼
の強度を向上させるに好適な含Ｎｉ１３Ｃｒ鋳鋼の製造
法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for producing Nj13Cr-containing cast steel, and particularly to a method for producing Ni13Cr-containing cast steel suitable for improving the strength of cast steel.
水力機械の主要部材である水車は、軸方向に対して所定
の角度に配列される複数のランナベーンとこれを支える
ランナボスとからなっている。このランナベ−／の材料
には１３Ｃｒ鋳鋼、ランナボスの材料には１３０ｒ鋳鋼
またはＭｎ鋳鋼などが主に便用され、特に含Ｎｉ１３Ｃ
ｒ鋳鋼が注目されている。この含Ｎｊ１３Ｃｒ鋳鋼は１
３Ｃｒ−１Ｎｌあるいは１３Ｃｒ−４Ｎｊなどの特殊ス
テンレス鋳鋼であって、水車のランチの耐久性を向上さ
せるのに好適な素材である。Ｎｉ含有量は通常１〜６重
量−である。A water wheel, which is a main component of a hydraulic machine, is composed of a plurality of runner vanes arranged at a predetermined angle with respect to the axial direction and a runner boss that supports the runner vanes. 13Cr cast steel is mainly used as the material for the runner base, and 130R cast steel or Mn cast steel is mainly used as the material for the runner boss.
r Cast steel is attracting attention. This Nj13Cr-containing cast steel is 1
It is a special stainless cast steel such as 3Cr-1Nl or 13Cr-4Nj, and is a material suitable for improving the durability of water turbine launches. The Ni content is usually 1 to 6 weight.
このような含Ｎｉ１３Ｃｒ鋳鋼品は、溶鋼を鋳型に注入
し凝固させて鋳物を形成し、該鋳物の表面を清浄するこ
とによって得られる。鋳物の押し湯や湯口は酸素アセチ
ノン炎やアークで切シ落す。Such a Ni13Cr-containing cast steel product is obtained by injecting molten steel into a mold and solidifying it to form a casting, and cleaning the surface of the casting. Casting feeders and sprues are cut off with oxygen acetinone flame or arc.
鋳張りはグライダ−で除去する。父、ときには溶接によ
って欠陥を補修する。その後で熱処理を施し、最後に表
面仕上げのサンドブラスト処理などを行なう。The casting will be removed using a glider. My father sometimes repairs defects by welding. After that, heat treatment is applied, and finally the surface is sandblasted.
含Ｎｉ１３Ｃｒ鋳鋼鋳物は鋳込んだままの状態（ａｓｃ
ａｓ ｔ あるいはｇｒｅｅｎという）では比較的脆
くてその機械的性質もよいとはいえない。Ni13Cr-containing steel castings are in the as-cast state (asc
As t or green) is relatively brittle and its mechanical properties are not good.
従って、檀々の用途に供するため、含Ｎ１３Ｃｒ鋳鋼に
はそのデンドライト組織を破壊し、結晶粒を微細化して
、鋳造応力を除去して所要の機械的性質を与える熱処理
を施すのが一般的である。Therefore, in order to use it for various purposes, N13Cr-containing cast steel is generally subjected to heat treatment to destroy its dendrite structure, refine its grains, remove casting stress, and give it the required mechanical properties. be.
従来の含Ｎｉ１３Ｃｒ鋳鋼の熱処理は、鋳造した後、簡
単−焼戻をそれぞれ１回実権するのが一般的である。し
かしながら、従来の１回の熱処理では、含Ｎｉ１３Ｃｒ
鋳鋼の組織を十分に微細化することができないため、引
張強度が約８５Ｋｐ／＋ａ＋”、０．２％耐力が約７３
Ｋｇ／ｍ２程度であって、水車のランチ等の耐久許容値
を満たさないという問題点を有していた。In the conventional heat treatment of Ni13Cr-containing cast steel, it is common to perform simple and tempering once after casting. However, in the conventional one-time heat treatment, Ni13Cr-containing
Because the structure of cast steel cannot be refined sufficiently, the tensile strength is approximately 85Kp/+a+" and the 0.2% yield strength is approximately 73.
Kg/m2, which had the problem of not meeting the durability tolerance for waterwheel launches, etc.
本発明の目的は、含Ｎｉ１３（：ｒ鋳鋼の強度を向上さ
せるのに好適な熱処理法を有する含Ｎｉ１３Ｃｒ鋳鋼の
製造法を提供するにある。An object of the present invention is to provide a method for producing Ni13Cr-containing cast steel, which has a heat treatment method suitable for improving the strength of Ni13(:r-containing cast steel).
本発明は、溶鋼を鋳型に注湯して含Ｎｊ１３Ｃｒ鋳鋼鋳
物を製造した後、該鋳鋼を焼準焼戻する含Ｎｉ１３Ｃｒ
鋳鋼の熱処理法において、＃ｊ紀焼簡単処理を複数回繰
シ返すことを特徴とする。The present invention involves pouring molten steel into a mold to produce a Ni13Cr-containing cast steel casting, and then normalizing and tempering the cast steel.
The heat treatment method for cast steel is characterized by repeating the simple #j firing process multiple times.
鋳造のままの状態の含Ｎ１１３Ｃｒ鋳鋼を焼準焼戻する
と、組織が微細化して、強度が向上することは知られて
いる。本発明は、この焼準焼戻の熱処理を複数回繰シ返
すことにより、更に微細化が進み、強度の向上を図るこ
とができることに着目してなされたものである。It is known that when N113Cr-containing cast steel in an as-cast state is normalized and tempered, the structure becomes finer and the strength is improved. The present invention was made based on the fact that by repeating this normalizing and tempering heat treatment multiple times, it is possible to further refine the material and improve the strength.
１３Ｃｒ鋳鋼はＮｉを添加すると、自硬性を増すと共に
、焼もどし抵抗性が向上して強さも高くなるという性質
を有している。この含Ｎｉ１３Ｃｒ鋳鋼の簡単処理は、
９５０〜１０５０ｒＸ約２．５Ｈｒの加熱後空冷または
油冷することか、好ましく、これによって十分にＣを固
溶させる。次いで、５５０〜６６０Ｃ×約１０Ｈｒ加熱
後、空冷又は炉冷の焼戻を施す。このような簡単−焼戻
熱処理を複数回繰シ返せば、水車のランチとして信頼性
および品質の安定性に優れ九ＮｔｔａＣｒ鋳鋼が得られ
る。特に、大聖水車のランチにおいては一回の簡単−焼
戻熱処理そは部分的に材質欠陥を生ずるおそれがあり、
この欠陥部が応力集中を受けて運転中に破壊を起す危険
性かあるので、本発明を適用することが有効である。13Cr cast steel has the property that when Ni is added, it increases its self-hardening properties, improves its tempering resistance, and increases its strength. The simple processing of this Ni13Cr-containing cast steel is as follows:
It is preferable to perform air cooling or oil cooling after heating for 950 to 1050 r.times.about 2.5 hours, thereby sufficiently dissolving C into solid solution. Next, after heating at 550 to 660 C x about 10 hours, tempering is performed by air cooling or furnace cooling. By repeating such simple tempering heat treatment several times, a 9NttaCr cast steel with excellent reliability and quality stability can be obtained as a launch material for a water turbine. In particular, in the case of Daisei Suisha's lunch, there is a risk that a single simple tempering heat treatment may cause material defects in some areas.
Since there is a risk that this defective portion may be subject to stress concentration and breakage during operation, it is effective to apply the present invention.
含Ｎ１１３（、ｒ鋳鋼の好ましい成分組成は重量％で０
０．０６１以下、Ｓ ｉ Ｏ，２５〜０．５ ％、Ｎｎ
Ｏ，５〜１ｅｓ、 Ｎｔａ 〜ａｓ特に４．８〜５．８
％、Ｃｒ１２〜１４チ、残部実質的にｐｅよりなる。The preferred composition of N113-containing cast steel is 0% by weight.
0.061 or less, SiO, 25-0.5%, Nn
O,5~1es, Nta~as especially 4.8~5.8
%, 12 to 14 Cr, and the remainder substantially consists of pe.
次に、本発明の実施例について述べる。 Next, examples of the present invention will be described.
まず、第１表に示す成分組成の含Ｎｉ１３Ｃｒ鋳鋼を鋳
造し、鋳放し状態で第１図に示す簡単−焼戻の熱処理を
複数回廊した。簡単は９５０〜１０５０Ｃｘ２．５Ｈｒ
に保持した後、空冷（Ａ＠Ｃ）するもので、鋳鋼の微細
化を図る熱処理であシ、次の焼戻は５５０〜６００ＣＸ
１０Ｈｒ保持した後、炉冷（Ｆ、Ｃ）又は空冷（Ａ −
Ｃ）である。First, Ni13Cr-containing cast steel having the composition shown in Table 1 was cast, and in the as-cast state was subjected to the simple-tempering heat treatment shown in FIG. 1 in multiple cycles. Easy is 950~1050Cx2.5Hr
After being held at a temperature of 550 to 600C
After holding for 10 hours, furnace cooling (F, C) or air cooling (A-
C).
第２図には上記簡単−焼戻の熱処理の回数と機械的性質
の関係を示すつ特に鋳鋼の引張強さ及び０．２％耐力が
熱処理回数の増加に伴って改善されている。FIG. 2 shows the relationship between the number of heat treatments in the simple tempering process and mechanical properties. In particular, the tensile strength and 0.2% yield strength of cast steel are improved as the number of heat treatments increases.
第１表 （重ｔチ）
すなわち、本発明によ゛る含Ｎｉ１３Ｃｒ鋳鋼では１回
熱処理に比較して、２回、３回及び４回熱処理を実施す
ると、引張強さはそれぞれ約２％、約４１及び約６俤向
上し、また０、２１耐力でそれぞれ約３俤、約６１及び
約１３１向上することが判明した。特に、４回繰返した
ものは、引張強さのバラツキが少なく、効果大である。Table 1 (Heavy weight) In other words, in the Ni13Cr-containing cast steel according to the present invention, when heat treatment is performed twice, three times, and four times, the tensile strength is about 2%, respectively, compared to when heat treated once. It was found that the yield strength was improved by about 41 and about 6, and the yield strength of 0 and 21 was improved by about 3 and 61 and about 131, respectively. In particular, when the test is repeated four times, there is little variation in tensile strength and the effect is great.
以上のように、本発明によれば、高い引張プ強さおよび
耐力を有する含Ｎｉ１３Ｃｒ鋳鋼を得ることができる。As described above, according to the present invention, Ni13Cr-containing cast steel having high tensile strength and proof stress can be obtained.
第１図は繰返し熱処理のダイアグラム、第２図は熱処理
回数と機械的性質の関係を示す特性図である。FIG. 1 is a diagram of repeated heat treatments, and FIG. 2 is a characteristic diagram showing the relationship between the number of heat treatments and mechanical properties.
Claims (1)
、得られた鋳鋼を焼準焼戻する含Ｎｉ１３Ｃｒ鋳鋼の製
造法において、前記焼準焼戻処理を複数回繰り返すこと
を特徴とする含Ｎｉ１３Ｃｒ鋳鋼の製造法。1. A method for manufacturing Ni13Cr-containing cast steel, in which molten Ni13Cr steel is poured into a mold and solidified, and the obtained cast steel is normalized and tempered, characterized by repeating the normalizing treatment a plurality of times. A method for producing Ni13Cr-containing cast steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1203685A JPS61170510A (en) | 1985-01-25 | 1985-01-25 | Manufacture of 13cr cast steel containing ni |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1203685A JPS61170510A (en) | 1985-01-25 | 1985-01-25 | Manufacture of 13cr cast steel containing ni |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61170510A true JPS61170510A (en) | 1986-08-01 |
Family
ID=11794377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1203685A Pending JPS61170510A (en) | 1985-01-25 | 1985-01-25 | Manufacture of 13cr cast steel containing ni |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61170510A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205458A (en) * | 2019-07-01 | 2019-09-06 | 浙江开诚机械有限公司 | A kind of high-alloy steel special material improves the processing method of mechanical performance |
-
1985
- 1985-01-25 JP JP1203685A patent/JPS61170510A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205458A (en) * | 2019-07-01 | 2019-09-06 | 浙江开诚机械有限公司 | A kind of high-alloy steel special material improves the processing method of mechanical performance |
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