JPS60224753A - Manufacture of stainless sintered material - Google Patents
Manufacture of stainless sintered materialInfo
- Publication number
- JPS60224753A JPS60224753A JP7997184A JP7997184A JPS60224753A JP S60224753 A JPS60224753 A JP S60224753A JP 7997184 A JP7997184 A JP 7997184A JP 7997184 A JP7997184 A JP 7997184A JP S60224753 A JPS60224753 A JP S60224753A
- Authority
- JP
- Japan
- Prior art keywords
- sintered material
- stainless steel
- sintered
- sintering
- nitrogen
- 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
【発明の詳細な説明】
（δ） 発明の技術分野
本発明は硬度の高いステンレス焼結材を得るための製造
方法に関する。DETAILED DESCRIPTION OF THE INVENTION (δ) Technical Field of the Invention The present invention relates to a manufacturing method for obtaining a highly hard stainless steel sintered material.
申）従来技術と問題点
従来、オーステナイト系ステンレス鋼粉を焼結しステン
レス焼結材を形成する製造は、第１図の製造工程図に示
すように、焼結ゾーン】においては還元環境に１時間当
たり６５００ Ｎ （６５００／Ｉ Ｈ’）の純水素を
用い、焼結ゾーンの温度を１２５０℃として１時間ステ
ンレス鋼粉を加熱して焼結を行い、その後冷却ゾーン２
において還元雰囲気に５５００ ｊｌノＪＨの純水素を
用い、自然冷却してステンレス焼結材を形成していた。Conventional technology and problems Conventionally, in the manufacturing process of sintering austenitic stainless steel powder to form sintered stainless steel material, as shown in the manufacturing process diagram in Figure 1, in the sintering zone, a reducing environment is used. Using pure hydrogen at 6500 N per hour (6500/I H'), the stainless steel powder was heated for 1 hour at a temperature of 1250°C in the sintering zone, and then sintered in the cooling zone 2.
A stainless steel sintered material was formed by natural cooling using pure hydrogen of 5,500 JH in a reducing atmosphere.
この製造方法によるとステンレス焼結材の硬度（以後Ｈ
ＲＢで表す）はＨＲＢ２６〜３０の範囲が得られ、従来
より通信機器に用いられるステンレス部品として形成さ
れ広く用いられていた。According to this manufacturing method, the hardness of the stainless steel sintered material (hereinafter referred to as H
(represented by RB) has an HRB range of 26 to 30, and has been conventionally formed and widely used as stainless steel parts used in communication equipment.
近年、これ等ステンレス部品の組立加工の効率化のため
、部品組立時にカシメ加工が必要となり従来のステンレ
ス部品の硬度ではカシメ強度が得られないといった欠点
が生じ、カシメ強度を持たせるための高い硬度が必要と
なった。In recent years, in order to improve the efficiency of assembling these stainless steel parts, caulking is required when assembling the parts, and the hardness of conventional stainless steel parts has the disadvantage of not being able to provide caulking strength. became necessary.
（Ｃ１発明の目的
本発明は上述した従来のステンレス焼結材の製造方法の
欠点に鑑みて創案されたもので、高い硬度が得られるス
テンレス焼結材の製造方法を提供することにある。(C1 Purpose of the Invention The present invention was devised in view of the above-mentioned drawbacks of the conventional method for manufacturing sintered stainless steel material, and its object is to provide a method for manufacturing sintered stainless steel material that can obtain high hardness.
＋ｄｌ 発明の構成
そしてこの目的は本発明によれば、オーステナイト系ス
テンレス鋼粉を焼結して焼結材を形成するに際し、前記
ステンレス鋼粉を所定の温度で焼結するとともに、還元
雰囲気に窒素が水素に対して５０〜７０％の流量比とな
る混合ガスを使用し、焼結ゾーンにおいて加熱を行なっ
た後、冷却ゾーンにおいて上記焼結ゾーンにおける運転
雰囲気と同し雰囲気で焼結材の冷却を行うことを特徴と
するステンレス焼結材の製造方法により達せられる。+dl Structure and object of the invention According to the present invention, when sintering austenitic stainless steel powder to form a sintered material, the stainless steel powder is sintered at a predetermined temperature, and nitrogen is added to a reducing atmosphere. After heating in the sintering zone using a mixed gas with a flow rate ratio of 50% to 70% of hydrogen, the sintered material is cooled in the cooling zone in the same atmosphere as the operating atmosphere in the sintering zone. This is achieved by a method for manufacturing a sintered stainless steel material, which is characterized by performing the following steps.
（ｅｌ 発明の実施例
以下、本発明による一実施例を前記の第１図に示す製造
工程図を参照して詳細に説明する。Ｎｉが９〜１３％＋
Ｃｒが１８〜２０％、Ｃが０．０３以下、Ｓｔが１゜０
０％以下、Ｍｎが２．００％以下、残がＦｅとなる成分
のオーステナイト系ステンレス（ＳｕＳ ３０４Ｌ）を
還元雰囲気として水素５０００ Ｉ！／Ｉ Ｈに対して
窒素を２５００ ｅ／ＩＨまたは３０００ ｊ！ ／Ｉ
Ｈまたは３５００ ＃ ／Ｉ Ｈと５０％、６０％、
７０％の３種類の流量比の混合ガスをそれぞれ用いると
ともに、焼結ゾーンにおいて１２５０’Ｃの温度で１時
間の加熱を行なった後、冷却ゾーンにおいて上記の焼結
ゾーンにおける還元雰囲気と同じ雰囲気で焼結材の冷却
を行なう。この焼結過程において窒素により焼結材に窒
化層が形成され焼結材の硬度の向上が得られることとな
る。(el Example of the Invention Hereinafter, an example of the present invention will be described in detail with reference to the manufacturing process diagram shown in FIG. 1. Ni is 9 to 13% +
Cr: 18-20%, C: 0.03 or less, St: 1°0
0% or less, Mn is 2.00% or less, and the balance is Fe. Nitrogen to /I H 2500 e/IH or 3000 j! /I
H or 3500 # /I H and 50%, 60%,
Using three types of gas mixtures with a flow rate ratio of 70%, and heating at a temperature of 1250'C for 1 hour in the sintering zone, the cooling zone was heated in the same reducing atmosphere as in the sintering zone. Cool the sintered material. In this sintering process, a nitrided layer is formed on the sintered material by nitrogen, and the hardness of the sintered material is improved.
次に上記の３種類の還元雰囲気を用いて焼結を行なった
焼結材と、還元雰囲気に純水素を用いて焼結を行なった
従来の焼結材とについて比較試験を行なった結果につい
て説明する。Next, we will explain the results of a comparative test between sintered materials sintered using the three types of reducing atmospheres mentioned above and conventional sintered materials sintered using pure hydrogen in the reducing atmosphere. do.
ｔｘｔ硬度
従来の焼結材はＨＲＢ２６〜２９の硬度範囲にあり平均
してＨＲＢ２８となっている。この発明による焼結材の
硬度は第２図ｆａｔ 、 （ｂｌ 、 ｆｃｌの試験デ
ータに示すように、水素に対する窒素の流量比５０％の
場合ＨＲＢ５９〜６３の硬度範囲にあり平均してＨＲＢ
６０となり、流量比６０％の場合ＨＲＢ６３〜６７の硬
度範囲にあり平均してＨＲＢ６５となり、流量比７０％
の場合ＨＲＢ６５〜７０の硬度範囲にあり平均してＨＲ
Ｂ６８となる。つまり、従来の焼結材に比較して本発明
の焼結材はＨＲＢ３２〜４ｏと高い硬度が得られた。txt hardness Conventional sintered materials have a hardness range of HRB26 to 29, with an average HRB of 28. The hardness of the sintered material according to the present invention is in the range of HRB 59 to 63 when the flow rate ratio of nitrogen to hydrogen is 50%, as shown in the test data in Figure 2 fat, (bl, fcl), and on average HRB
60, and when the flow rate ratio is 60%, the hardness is in the HRB63 to 67 hardness range, and the average HRB is 65, and the flow rate ratio is 70%.
In the case of HRB, the hardness is in the range of 65 to 70 and the average HR
It becomes B68. That is, compared to the conventional sintered material, the sintered material of the present invention had a high hardness of HRB 32 to 4o.
（２）その他の特性
本発明による焼結材の焼結密度は６．６ｇ／ ｃｄ、引
張強さ４８ｋｇ／ ｖＸ、であり従来の焼結材と比較し
て約４０％高、くなっている。また伸びは１０％であり
従来の焼結材と比較して約１０％低くなっている。なお
上記の数値は試験結果の平均値を示している。(2) Other characteristics The sintered density of the sintered material according to the present invention is 6.6 g/cd, and the tensile strength is 48 kg/vX, which is approximately 40% higher than that of conventional sintered material. . Furthermore, the elongation is 10%, which is approximately 10% lower than that of conventional sintered materials. Note that the above numerical values indicate the average value of the test results.
（「）発明の効果
以上の説明から明らかなように本発明はオーステナイト
系ステンレス鋼粉を焼結して焼結材を形成するに際し、
還元雰囲気に窒素が水素に対して５０〜７０％の流量比
となる混合ガスを使用することにより硬度がＨＲＢ６５
〜７０となるステンレス焼結材を得ることができるとい
った効果がある。(“) Effects of the Invention As is clear from the above explanation, the present invention has the following advantages when sintering austenitic stainless steel powder to form a sintered material:
By using a gas mixture in which the flow rate ratio of nitrogen to hydrogen is 50 to 70% in the reducing atmosphere, the hardness can be reduced to HRB65.
There is an effect that a stainless steel sintered material having a hardness of 70 to 70 can be obtained.
第１図はステンレス焼結材の製造工程図、第２図（ａｌ
、 （ｂｌ、 （Ｃ１は本発明によるステンレス焼結材
の硬度試験データである。図において、１は焼結ゾーン
、２は冷却ゾーンをそれぞれ示している。
第１図
（Ｇ）
（ｊＮ針し通す１銅
→居度（ＨＲＢ）
（ｂｌFigure 1 is a manufacturing process diagram of stainless steel sintered material, Figure 2 (al
, (bl, (C1 is the hardness test data of the stainless steel sintered material according to the present invention. In the figure, 1 indicates the sintering zone and 2 indicates the cooling zone. Passing 1 copper → Ido (HRB) (bl
Claims (1)
成するに際し、前記ステンレス鋼粉を所定の温度で焼結
するとともに、還元雰囲気に窒素が水素に対して５０〜
７０％の流量比となる混合ガスを使用し、焼結ゾーンに
おいて加熱を行なった後、冷却ゾーンにおいて上記焼結
ゾーンにおける運転雰囲気と同じ雰囲気で焼結材の冷却
を行うことを特徴とするステンレス焼結材の製造方法。When sintering austenitic stainless steel powder to form a sintered material, the stainless steel powder is sintered at a predetermined temperature, and nitrogen in the reducing atmosphere is
Stainless steel characterized in that, after heating in a sintering zone using a mixed gas with a flow rate ratio of 70%, the sintered material is cooled in a cooling zone in the same atmosphere as the operating atmosphere in the sintering zone. Method of manufacturing sintered material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7997184A JPS60224753A (en) | 1984-04-19 | 1984-04-19 | Manufacture of stainless sintered material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7997184A JPS60224753A (en) | 1984-04-19 | 1984-04-19 | Manufacture of stainless sintered material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60224753A true JPS60224753A (en) | 1985-11-09 |
Family
ID=13705205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7997184A Pending JPS60224753A (en) | 1984-04-19 | 1984-04-19 | Manufacture of stainless sintered material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60224753A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0257661A (en) * | 1988-08-20 | 1990-02-27 | Kawasaki Steel Corp | Manufacture of high-nitrogen stainless steel sintered body |
| US6533996B2 (en) | 2001-02-02 | 2003-03-18 | The Boc Group, Inc. | Method and apparatus for metal processing |
| JP2015004133A (en) * | 2014-08-06 | 2015-01-08 | 日本冶金工業株式会社 | Surface modification method for stainless steel sheet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5049109A (en) * | 1973-09-01 | 1975-05-01 | ||
| JPS5421806A (en) * | 1977-07-20 | 1979-02-19 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPS57126946A (en) * | 1981-01-29 | 1982-08-06 | Sumitomo Electric Ind Ltd | Production of sintered tool steel |
-
1984
- 1984-04-19 JP JP7997184A patent/JPS60224753A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5049109A (en) * | 1973-09-01 | 1975-05-01 | ||
| JPS5421806A (en) * | 1977-07-20 | 1979-02-19 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPS57126946A (en) * | 1981-01-29 | 1982-08-06 | Sumitomo Electric Ind Ltd | Production of sintered tool steel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0257661A (en) * | 1988-08-20 | 1990-02-27 | Kawasaki Steel Corp | Manufacture of high-nitrogen stainless steel sintered body |
| US6533996B2 (en) | 2001-02-02 | 2003-03-18 | The Boc Group, Inc. | Method and apparatus for metal processing |
| US7018584B2 (en) | 2001-02-02 | 2006-03-28 | The Boc Group, Inc. | Method and apparatus for metal processing |
| JP2015004133A (en) * | 2014-08-06 | 2015-01-08 | 日本冶金工業株式会社 | Surface modification method for stainless steel sheet |
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