JPH07243008A - Steel sintered compact - Google Patents
Steel sintered compactInfo
- Publication number
- JPH07243008A JPH07243008A JP3125294A JP3125294A JPH07243008A JP H07243008 A JPH07243008 A JP H07243008A JP 3125294 A JP3125294 A JP 3125294A JP 3125294 A JP3125294 A JP 3125294A JP H07243008 A JPH07243008 A JP H07243008A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- hardness
- sintered compact
- steel sintered
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐摩耗性、靱性に優れ
た鋼焼結体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel sintered body having excellent wear resistance and toughness.
【０００２】[0002]
【従来の技術】従来、鋼焼結体は、原料として金属や合
金の粉末を使用し、射出成形、プレス成形などの成形を
行ない、成形体を焼結することにより製造している。2. Description of the Related Art Conventionally, a steel sintered body is manufactured by using a powder of metal or alloy as a raw material, performing molding such as injection molding or press molding, and sintering the molded body.
【０００３】これらの焼結体は、極めて多種類の装置、
物品などのパーツに供給されているが、例えば自転車
用、ミシン用に好適な耐摩耗性および靱性に優れた鋼焼
結体に対する需要が、近年増大している。These sintered bodies are used in a very wide variety of devices,
Although it is supplied to parts such as articles, the demand for a steel sintered body having excellent wear resistance and toughness, which is suitable for bicycles and sewing machines, for example, has been increasing in recent years.
【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、上記事情に鑑み、耐摩耗性および靱性に優れた鋼焼
結体を提供することにある。SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a steel sintered body having excellent wear resistance and toughness.
【０００５】本発明者は、上記目的を達成すべく鋭意研
究した結果、比較的Ｃｒ含有量の高い鋼焼結体は、表面
硬化処理の作用が表面から比較的浅い部分で止まること
を見出し本発明に到達した。As a result of earnest studies to achieve the above object, the present inventor has found that the effect of the surface hardening treatment on the steel sintered body having a relatively high Cr content stops at a portion relatively shallow from the surface. The invention was reached.
【０００６】[0006]
【課題を解決するための手段】本発明は、前記目的を達
成するものとして、Ｃｒを１０重量％以上含み、焼結密
度が９５％以上、表面硬さがＨR Ｃで５０以上およびコ
ア部の硬さがＨR Ｃで２５以下である鋼焼結体である。The present invention SUMMARY OF THE INVENTION may, as to achieve the object, comprises Cr 10 wt% or more, the sintered density of 95% or more, the surface hardness is at H R C 50 or more and the core portion Is a steel sintered body having a hardness of 25 or less in H R C.
【０００７】[0007]
【作用】本発明の鋼焼結体において、Ｃｒは、表面硬化
処理によりクロムの炭化物、窒化物、炭窒化物などの化
合物を形成し表面硬さをＨR Ｃで５０以上とするに必要
な成分であり、１０重量％以上含む必要がある。１０重
量％未満では、表面硬さがＨR Ｃで５０未満になり易
く、充分な耐摩耗性が得られ難い。Ｃｒ含有量の上限
は、通常３０重量％である。[Action] In the steel sintered body of the present invention, Cr is required chromium carbide by surface hardening, nitride, the surface hardness to form a compound such as carbonitrides in the 50 or more H R C It is a component and must be contained in an amount of 10% by weight or more. If it is less than 10% by weight, the surface hardness of H R C tends to be less than 50, and it is difficult to obtain sufficient wear resistance. The upper limit of the Cr content is usually 30% by weight.
【０００８】次に、焼結密度は、９５％以上であること
が必要である。９５％未満では、表面硬化処理の作用
が、コア部が充分得られなくなるまで進み、充分な靱性
が得られ難い。Next, the sintered density must be 95% or more. If it is less than 95%, the effect of the surface hardening treatment proceeds until the core part cannot be sufficiently obtained, and it is difficult to obtain sufficient toughness.
【０００９】更に、表面硬さは、ＨR Ｃで５０以上であ
ることが必要である。ＨR Ｃで５０未満では、充分な耐
摩耗性が得られ難い。Further, the surface hardness must be 50 or more in H R C. The 50 less than in H R C, hardly sufficient abrasion resistance can not be obtained.
【００１０】また、コア部は表面硬化処理の作用が及ん
でいない部分であり、その硬さは、ＨR Ｃで２５以下で
あることが必要である。ＨR Ｃで２５を超えると、充分
な靱性が得られ難い。但し、この硬さは、ＨR Ｃで表記
できず、ＨR Ｂで表記できる程度でもよい。Further, the core portion is a portion which is not affected by the surface hardening treatment, and its hardness is required to be 25 or less in H R C. Beyond 25 H R C, hardly sufficient toughness can not be obtained. However, this hardness may not be expressed by H R C but may be expressed by H R B.
【００１１】本発明の鋼焼結体は、次のような方法によ
り製造することができる。即ち、金属粉末および合金粉
末のうちの１種以上を配合し、平均粒径３〜４０μｍ
の、Ｃｒを１０重量％以上含む所望組成の鋼粉末を調製
する。次に、この粉末を直接プレス成形したり、バイン
ダーと混練して射出成形した後脱バインダーしたりして
得た成形体を焼結する。焼結は焼結密度が９５％以上に
なるように行なう。このようにして得た硬さがＨR Ｃで
２５以下の焼結体に公知の、浸炭、窒化、浸炭窒化など
の表面硬化処理を施す。この処理によって、表面硬さは
通常ＨR Ｃで５０以上となる。The steel sintered body of the present invention can be manufactured by the following method. That is, one or more kinds of metal powder and alloy powder are mixed, and the average particle size is 3 to 40 μm.
A steel powder having a desired composition containing 10% by weight or more of Cr is prepared. Next, this powder is directly press-molded, or is kneaded with a binder, injection-molded and then de-bindered to sinter the molded body. Sintering is performed so that the sintered density is 95% or more. The thus obtained sintered body having a hardness of H R C of 25 or less is subjected to known surface hardening treatment such as carburizing, nitriding, carbonitriding. By this treatment, the surface hardness is usually 50 or higher in H R C.
【００１２】[0012]
実施例１ ＳＵＳ ３０４Ｌオーステナイト系ステンレス鋼焼結体
を製造する目的で、平均粒径１５μｍのＳＵＳ ３０４
Ｌ鋼粉末を使用した。Example 1 For the purpose of producing a SUS 304L austenitic stainless steel sintered body, SUS 304 having an average particle size of 15 μm.
L steel powder was used.
【００１３】この粉末と、低密度ポリエチレン、エチレ
ン酢酸ビニル共重合体およびステアリン酸を重量比３：
１：１でブレンドしたバインダーとを重量比９２：８で
混練した。This powder was mixed with low density polyethylene, ethylene vinyl acetate copolymer and stearic acid in a weight ratio of 3:
A 1: 1 blended binder was kneaded in a weight ratio of 92: 8.
【００１４】この混練物をペレット状に造粒し、厚さ５
ｍｍのテストピースを射出成形した（射出圧１００ＭＰ
ａ、射出温度１６０℃）。次に、このテストピースを窒
素雰囲気中４５０℃まで２０℃／時の昇温速度で加熱
し、熱分解による脱バインダーを行なった。更に、脱バ
インダーした成形体を真空焼結炉に装入し、真空雰囲気
中１０℃／分の昇温速度で１３００℃まで加熱し、１３
００℃で１時間保持した。その後、焼結体を１１００℃
まで炉冷し、次に窒素を炉内に導入して強制冷却した。This kneaded product was granulated into pellets to give a thickness of 5
mm test piece was injection molded (injection pressure 100MP
a, injection temperature 160 ° C). Next, the test piece was heated to 450 ° C. in a nitrogen atmosphere at a temperature rising rate of 20 ° C./hour to remove the binder by thermal decomposition. Further, the debindered compact was placed in a vacuum sintering furnace and heated to 1300 ° C. at a temperature rising rate of 10 ° C./min in a vacuum atmosphere,
Hold at 00 ° C for 1 hour. After that, the sintered body is heated to 1100 ° C.
The furnace was cooled to the next temperature, and then nitrogen was introduced into the furnace for forced cooling.
【００１５】上記焼結体には、更に、変成ブタンガス中
９３０℃まで加熱しその温度に４時間保持した後、油冷
する浸炭焼入れ処理を施した。The above sintered body was further subjected to a carburizing and quenching treatment in which oil was cooled, after being heated to 930 ° C. in modified butane gas and kept at that temperature for 4 hours.
【００１６】このように表面硬化処理した焼結体につい
て、（１）Ｃｒ含有量の分析、（２）焼結密度の測定、
（３）表面硬さおよびコア部の硬さの測定、（４）伸び
の測定（ＪＩＳ Ｇ４１０３で規定された引張試験片１
４号Ｂによる）、（５）軟Ｘ線による欠陥調査を行なっ
た。これらのうち、（１）〜（４）の結果を表１に示
す。なお、（５）では、欠陥は認められなかった（以下
の試験においても、すべて欠陥は認められなかった）。With respect to the sintered body thus surface-hardened, (1) analysis of Cr content, (2) measurement of sintered density,
(3) Measurement of surface hardness and hardness of core portion, (4) Measurement of elongation (tensile test piece 1 defined in JIS G4103
No. 4B), (5) Defect inspection by soft X-ray was performed. Of these, the results of (1) to (4) are shown in Table 1. In addition, in (5), no defect was observed (in the following tests, no defect was observed).
【００１７】実施例２，３ ＳＵＳ３１６Ｌ（実施例２）およびＳＵＳ３１７Ｌ（実
施例３）のオーステナイト系ステンレス鋼焼結体を製造
する目的で、夫々ＳＵＳ３１６Ｌ鋼粉末（平均粒径１５
μｍ）、ＳＵＳ３１７Ｌ鋼粉末（平均粒径１５μｍ）を
使用したこと以外は、実施例１と同様に試験した。その
結果を表１に示す。Examples 2 and 3 For the purpose of producing austenitic stainless steel sintered bodies of SUS316L (Example 2) and SUS317L (Example 3), SUS316L steel powder (average particle size 15
μm), and SUS317L steel powder (average particle size 15 μm) were used, and the same test as in Example 1 was performed. The results are shown in Table 1.
【００１８】実施例４〜６ 焼結体に、ブタン、ＮＨ3 ，ＲＸからなる混合ガス中８
８０℃まで加熱しその温度に２時間保持した後、油冷す
る浸炭窒化焼入れ処理を施した以外は、実施例１，２，
３と同様に試験した（夫々実施例４，５，６）。その結
果を表１に示す。Examples 4 to 6 Sintered bodies were mixed with butane, NH 3 and RX in a mixed gas 8
After heating to 80 ° C. and holding at that temperature for 2 hours, carbonitriding quenching treatment of oil cooling was performed, and
Tests were carried out as in 3 (Examples 4, 5 and 6 respectively). The results are shown in Table 1.
【００１９】比較例１ Ｃｒの含有量が８重量％でＦｅ以外の他の成分量は実施
例１で使用したのと同じＳＵＳ３０４Ｌ鋼粉末を使用し
た以外は、実施例１と同様に試験した。その結果を表１
に示す。Comparative Example 1 A test was conducted in the same manner as in Example 1 except that the Cr content was 8% by weight and the amount of other components other than Fe was the same as that used in Example 1 except that the same SUS304L steel powder was used. The results are shown in Table 1.
Shown in.
【００２０】比較例２ 脱バインダーした成形体を１０℃／分の昇温速度で１０
００℃まで加熱し、１０００℃で１時間保持した以外
は、実施例１と同様に試験した。その結果を表１に示
す。Comparative Example 2 The debindered molded body was heated to 10 ° C./min for 10 minutes.
A test was performed in the same manner as in Example 1 except that the material was heated to 00 ° C and kept at 1000 ° C for 1 hour. The results are shown in Table 1.
【００２１】比較例３，４ 焼結体に実施例４のような浸炭窒化焼入れ処理を施した
以外は、比較例１，２と同様に試験した（夫々比較例
３，４）。その結果を表１に示す。Comparative Examples 3 and 4 Tests were performed in the same manner as Comparative Examples 1 and 2 except that the sintered body was subjected to carbonitriding and quenching treatment as in Example 4 (Comparative Examples 3 and 4, respectively). The results are shown in Table 1.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【発明の効果】本発明によれば、耐摩耗性および靱性に
優れた鋼焼結体を提供することができる。According to the present invention, a steel sintered body having excellent wear resistance and toughness can be provided.
Claims (2)
９５％以上、表面硬さがＨR Ｃで５０以上およびコア部
の硬さがＨR Ｃで２５以下である鋼焼結体。Includes 1. A Cr 10 wt% or more, the sintered density of 95% or more, the surface hardness is steel sintered hardness of 50 or more and the core portion in H R C is 25 or less in H R C .
ス鋼である請求項１記載の鋼焼結体。2. The steel sintered body according to claim 1, wherein the steel containing 10 wt% or more of Cr is stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3125294A JPH07243008A (en) | 1994-03-01 | 1994-03-01 | Steel sintered compact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3125294A JPH07243008A (en) | 1994-03-01 | 1994-03-01 | Steel sintered compact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07243008A true JPH07243008A (en) | 1995-09-19 |
Family
ID=12326177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3125294A Pending JPH07243008A (en) | 1994-03-01 | 1994-03-01 | Steel sintered compact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07243008A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19944578A1 (en) * | 1999-09-17 | 2001-03-29 | Krupp Vdm Gmbh | Low-expansion iron-nickel alloy with special mechanical properties |
-
1994
- 1994-03-01 JP JP3125294A patent/JPH07243008A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19944578A1 (en) * | 1999-09-17 | 2001-03-29 | Krupp Vdm Gmbh | Low-expansion iron-nickel alloy with special mechanical properties |
| DE19944578C2 (en) * | 1999-09-17 | 2001-08-23 | Krupp Vdm Gmbh | Use of a low-expansion iron-nickel alloy with special mechanical properties |
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