JPH0827536A - Production of sintered compact of stainless steel - Google Patents
Production of sintered compact of stainless steelInfo
- Publication number
- JPH0827536A JPH0827536A JP18514294A JP18514294A JPH0827536A JP H0827536 A JPH0827536 A JP H0827536A JP 18514294 A JP18514294 A JP 18514294A JP 18514294 A JP18514294 A JP 18514294A JP H0827536 A JPH0827536 A JP H0827536A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- powder
- content
- sintered compact
- sintered body
- 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
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は耐食性に優れたステンレ
ス鋼焼結体の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a stainless steel sintered body having excellent corrosion resistance.
【０００２】[0002]
【従来の技術】従来、ステンレス鋼焼結体は、切削加工
が不要であること、材料設計の自由度が大きいこと等の
利点を有するため、ステンレス鋼粉末（組成が相異する
２種以上の粉末が混合され、平均組成がステンレス鋼組
成の粉末を含む）を成形した後、焼結する粉末冶金法に
よって製造されている。2. Description of the Related Art Conventionally, a stainless steel sintered body has advantages such as no need for cutting and a high degree of freedom in material design, and therefore, stainless steel powder (two or more kinds having different compositions) is used. The powders are mixed to form an average composition including powders having a stainless steel composition, and then sintered, and then manufactured by a powder metallurgy method.
【０００３】しかしながら、このようにして製造された
ステンレス鋼焼結体は、耐食性が充分でないという欠点
を有している。However, the stainless steel sintered body produced as described above has a drawback that the corrosion resistance is not sufficient.
【０００４】[0004]
【発明が解決しようとする課題】そこで、本発明の目的
は、上記欠点を解消し、耐食性が充分なステンレス鋼焼
結体を製造する方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide a method for producing a stainless steel sintered body having sufficient corrosion resistance.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記目的を達
成するものとして、前記従来の製造方法において、ステ
ンレス鋼粉末にグラファイト粉末を添加、混合し、該混
合後の混合粉末のＣ含有量および酸素含有量を夫々Ａｃ
原子％、Ａｏ原子％として、０．５Ａｏ≦Ａｃ≦２Ａｏ
を満足させた後、該混合粉末の成形を行うことを特徴と
するステンレス鋼焼結体の製造方法である。Means for Solving the Problems In order to achieve the above-mentioned object, the present invention is the above conventional manufacturing method, wherein graphite powder is added to and mixed with stainless steel powder, and the C content of the mixed powder after the mixing. And oxygen content respectively Ac
Atomic%, Ao atomic%, 0.5Ao ≦ Ac ≦ 2Ao
The method for producing a stainless steel sintered body is characterized in that the mixed powder is molded after satisfying the above conditions.
【０００６】[0006]
【作用】本発明において、焼結用粉末としてステンレス
鋼粉末（組成が相異する２種以上の粉末が混合され、平
均組成がステンレス鋼組成の粉末を含む）を使用する。In the present invention, as the sintering powder, stainless steel powder (a mixture of two or more kinds of powders having different compositions and an average composition including the powder of stainless steel) is used.
【０００７】上記ステンレス鋼粉末にグラファイト粉末
を添加、混合し、該混合後の混合粉末のＣ含有量および
酸素含有量を夫々Ａｃ原子％、Ａｏ原子％として、０．
５Ａｏ≦Ａｃ≦２Ａｏを満足させることが重要である。
グラファイト粉末は、ステンレス鋼粉末中に含まれる酸
素が形成しているクロム酸化物を後の焼結の工程で還元
するために添加、混合する。この還元により焼結体の耐
食性が著しく向上する。これは、非金属介在物として孔
食発生の起点となっていたクロム酸化物を実質的になく
することおよびこのことにより焼結性が向上し、焼結密
度が増大することによるものと推察される。グラファイ
ト粉末は市販のものを使用することができるが、その粒
度は、ステンレス鋼粉末の粒度より小さい方が好まし
い。Graphite powder was added to and mixed with the above stainless steel powder, and the C content and oxygen content of the mixed powder after the mixing were set to Ac atom% and Ao atom%, respectively.
It is important to satisfy 5Ao ≦ Ac ≦ 2Ao.
The graphite powder is added and mixed in order to reduce the chromium oxide formed by oxygen contained in the stainless steel powder in the subsequent sintering step. This reduction significantly improves the corrosion resistance of the sintered body. It is speculated that this is because the chromium oxide, which was the starting point of pitting corrosion as a non-metallic inclusion, is substantially eliminated, and this improves the sinterability and increases the sintered density. It Commercially available graphite powder can be used, but the particle size thereof is preferably smaller than that of the stainless steel powder.
【０００８】グラファイト粉末の添加量は、Ａｃが０．
５Ａｏ未満では、上記還元が充分でなく、一方、２Ａｏ
を超えると、焼結体の結晶粒界にクロム炭化物が形成さ
れ易く充分な耐食性が得られない。The amount of graphite powder added was such that Ac was 0.1.
If it is less than 5 Ao, the above reduction is not sufficient, while 2 Ao
If it exceeds, chromium carbides are likely to be formed at the crystal grain boundaries of the sintered body and sufficient corrosion resistance cannot be obtained.
【０００９】次に、上記のように調製した混合粉末を成
形する。成形は、圧縮成形法、押出成形法などを適宜採
用することができる。Next, the mixed powder prepared as described above is molded. For molding, a compression molding method, an extrusion molding method, or the like can be appropriately adopted.
【００１０】さらに、得られた成形体を焼結する。焼結
は、通常の条件で行えばよいが、雰囲気は真空中が好ま
しい。この際、成形体中のクロム酸化物とＣとを充分反
応させＣＯガスあるいはＣＯ2 ガスとして揮散させる。
このような焼結により得られた焼結体中のＣ含有量は、
０．１重量％以下、好ましくは０．０３重量％以下にな
る。Further, the obtained molded body is sintered. Sintering may be performed under normal conditions, but the atmosphere is preferably vacuum. At this time, the chromium oxide in the compact and C are sufficiently reacted to volatilize as CO gas or CO 2 gas.
The C content in the sintered body obtained by such sintering is
It is 0.1% by weight or less, preferably 0.03% by weight or less.
【００１１】[0011]
［実施例１〜４］焼結用粉末として、組成がＳＵＳ ３
１６ＬおよびＳＵＳ ３１７Ｌに相当するステンレス鋼
粉末（平均粒径２２ミクロン以下）を水アトマイズ法で
作成して使用した。これらの粉末の組成を表１に示す。[Examples 1 to 4] The composition of the sintering powder was SUS 3
16 L and SUS 317 L of stainless steel powder (average particle size 22 μm or less) were prepared by a water atomizing method and used. The compositions of these powders are shown in Table 1.
【００１２】これらの焼結用粉末に二次粒子の平均粒径
が１ミクロンのグラファイト粉末を添加し、Ｖブレンダ
ーで混合した。その添加量を表１に示す。Graphite powder having an average secondary particle size of 1 micron was added to these sintering powders and mixed with a V blender. The added amount is shown in Table 1.
【００１３】次に、混合粉末を圧縮成形し、さらに、成
形体を真空度１０-3ｔｏｒｒの真空中１３５０℃で焼結
した。Next, the mixed powder was compression-molded, and the molded body was sintered at 1350 ° C. in a vacuum having a vacuum degree of 10 -3 torr.
【００１４】得られた焼結体の酸素含有量およびＣ含有
量を表１に示す。また、これらの焼結体の孔食電位を測
定した。なお、孔食電位はＪＩＳ Ｇ ０５７７によっ
た。これらの測定値を表１に示す。Table 1 shows the oxygen content and C content of the obtained sintered body. Moreover, the pitting corrosion potential of these sintered bodies was measured. The pitting potential is according to JIS G 0577. Table 1 shows these measured values.
【００１５】［従来例］表１に示す組成の焼結用ステン
レス鋼粉末を使用し、グラファイト粉末を添加しなかっ
た以外は、実施例１と同様に試験した。得られた結果を
表１に示す。[Conventional Example] The same tests as in Example 1 were carried out except that sintering stainless steel powder having the composition shown in Table 1 was used and no graphite powder was added. The results obtained are shown in Table 1.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【発明の効果】本発明により、耐食性が著しく向上した
ステンレス鋼焼結体を製造することができる。According to the present invention, it is possible to produce a stainless steel sintered body having significantly improved corrosion resistance.
Claims (3)
る方法において、該粉末にグラファイト粉末を添加、混
合し、該混合後の混合粉末のＣ含有量および酸素含有量
を夫々Ａｃ原子％、Ａｏ原子％として、０．５Ａｏ≦Ａ
ｃ≦２Ａｏを満足させた後、該成形を行なうことを特徴
とするステンレス鋼焼結体の製造方法。1. In a method of forming stainless steel powder and then sintering the same, graphite powder is added to and mixed with the powder, and the C content and the oxygen content of the mixed powder after the mixing are Ac atomic%, respectively. As Ao atomic%, 0.5 Ao ≦ A
A method for producing a stainless steel sintered body, which comprises performing the forming after satisfying c ≦ 2Ao.
種以上の粉末が混合され、平均組成がステンレス鋼組成
の粉末である請求項１に記載のステンレス鋼焼結体の製
造方法。2. Stainless steel powders have different compositions.
The method for producing a stainless steel sintered body according to claim 1, wherein at least one kind of powder is mixed and the average composition is a powder of stainless steel.
ある請求項１または２に記載のステンレス鋼焼結体の製
造方法。3. The method for producing a stainless steel sintered body according to claim 1, wherein the C content of the sintered body is 0.1% by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18514294A JPH0827536A (en) | 1994-07-15 | 1994-07-15 | Production of sintered compact of stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18514294A JPH0827536A (en) | 1994-07-15 | 1994-07-15 | Production of sintered compact of stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0827536A true JPH0827536A (en) | 1996-01-30 |
Family
ID=16165614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18514294A Pending JPH0827536A (en) | 1994-07-15 | 1994-07-15 | Production of sintered compact of stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0827536A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009035786A (en) * | 2007-08-02 | 2009-02-19 | Hitachi Powdered Metals Co Ltd | Method for manufacturing sintered parts having corrosion resistance and abrasion resistance at high temperature |
| JP2009035785A (en) * | 2007-08-02 | 2009-02-19 | Hitachi Powdered Metals Co Ltd | Method for manufacturing sintered parts having corrosion resistance and abrasion resistance at high temperature |
| WO2010035853A1 (en) * | 2008-09-24 | 2010-04-01 | Ｊｆｅスチール株式会社 | Process for production of sintered compact by powder metallurgy |
| JP2012251245A (en) * | 2012-07-31 | 2012-12-20 | Hitachi Powdered Metals Co Ltd | Method for manufacturing sintered parts having corrosion resistance and abrasion resistance at high temperature |
-
1994
- 1994-07-15 JP JP18514294A patent/JPH0827536A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009035786A (en) * | 2007-08-02 | 2009-02-19 | Hitachi Powdered Metals Co Ltd | Method for manufacturing sintered parts having corrosion resistance and abrasion resistance at high temperature |
| JP2009035785A (en) * | 2007-08-02 | 2009-02-19 | Hitachi Powdered Metals Co Ltd | Method for manufacturing sintered parts having corrosion resistance and abrasion resistance at high temperature |
| WO2010035853A1 (en) * | 2008-09-24 | 2010-04-01 | Ｊｆｅスチール株式会社 | Process for production of sintered compact by powder metallurgy |
| JP2010100932A (en) * | 2008-09-24 | 2010-05-06 | Jfe Steel Corp | Process for production of sintered compact by powder metallurgy |
| KR101382304B1 (en) * | 2008-09-24 | 2014-04-08 | 제이에프이 스틸 가부시키가이샤 | Process for production of sintered compact by powder metallurgy |
| JP2012251245A (en) * | 2012-07-31 | 2012-12-20 | Hitachi Powdered Metals Co Ltd | Method for manufacturing sintered parts having corrosion resistance and abrasion resistance at high temperature |
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