JPH0466652A - Alloy steel for injection molding powder metallurgy excellent in hardenability - Google Patents
Alloy steel for injection molding powder metallurgy excellent in hardenabilityInfo
- Publication number
- JPH0466652A JPH0466652A JP17723090A JP17723090A JPH0466652A JP H0466652 A JPH0466652 A JP H0466652A JP 17723090 A JP17723090 A JP 17723090A JP 17723090 A JP17723090 A JP 17723090A JP H0466652 A JPH0466652 A JP H0466652A
- Authority
- JP
- Japan
- Prior art keywords
- hardenability
- injection molding
- molding powder
- alloy
- powder metallurgy
- 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
- 238000001746 injection moulding Methods 0.000 title claims abstract description 10
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 10
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 7
- 229910045601 alloy Inorganic materials 0.000 abstract description 9
- 239000000956 alloy Substances 0.000 abstract description 9
- 239000000843 powder Substances 0.000 abstract description 9
- 238000005496 tempering Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000005245 sintering Methods 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 229910018106 Ni—C Inorganic materials 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 1
- 238000010791 quenching Methods 0.000 description 7
- 230000000171 quenching effect Effects 0.000 description 7
- 239000002245 particle Substances 0.000 description 5
- 229910001339 C alloy Inorganic materials 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、焼入性に優れた射出成形粉末冶金用合金鋼の
改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in alloy steel for injection molding powder metallurgy, which has excellent hardenability.
三次元的に複雑な形状を有する製品を製造するため、純
Ｆｅ、 Ｆｅ−Ｎｉ系合金、Ｆｅ−Ｎ１−Ｃ系合金。In order to manufacture products with three-dimensionally complex shapes, we use pure Fe, Fe-Ni alloys, and Fe-N1-C alloys.
ステンレス鋼、析出硬化型ステンレス鋼、高速度鋼、超
硬合金等の金属粉末とバインダーを混練して得た混練物
を射出成形し、その後脱バインダーして焼結する射出成
形粉末冶金法が知られている。The injection molding powder metallurgy method is known in which the kneaded material obtained by kneading a binder with metal powder such as stainless steel, precipitation hardening stainless steel, high speed steel, and cemented carbide is injection molded, and then the binder is removed and sintered. It is being
そしてこれらの合金は通常、焼結後、更に、サイジング
加工を始めとしてフライス加工、穴あけ加工、タップ加
工、バレル研磨など種々な後加工および焼入れ焼戻し処
理、軟化焼鈍、磁気焼鈍、時効処理、ＨＩＰ処理などの
熱処理を経て製品となるが、これらの製品には焼結上り
状態で後加工性が良好でしかも焼入れ焼戻し処理により
表面硬化し、耐摩耗性が良好であるという要求が広い分
野でなされてきている。After sintering, these alloys are usually subjected to various post-processing processes such as sizing, milling, drilling, tapping, and barrel polishing, as well as quenching and tempering treatments, softening annealing, magnetic annealing, aging treatment, and HIP treatment. These products are made into products after undergoing heat treatments such as sintering, but there are demands in a wide range of fields for these products to have good post-processability in the sintered state, and also to be surface hardened by quenching and tempering, and to have good wear resistance. ing.
このような特性を前記合金の中で最も満たす材質として
、ＦｅＮ１−Ｃ合金が従来より使われてきた。FeN1-C alloy has conventionally been used as the material that best satisfies these characteristics among the alloys.
しかるに、Ｆｅ−Ｎ１−Ｃ合金は、焼結上り状態で後加
工性は良いものの焼入性が十分でなく、油焼入および焼
戻しの熱処理をした後の硬度がビッカース硬度（Ｈｖ）
で７００を超えることは無く、耐摩耗性に今−歩優れな
かった。かかる理由から本発明の目的は、焼結上り状態
にて後加工性がＦｅ −Ｎｉ−Ｃ合金と同等程度で、し
かも熱処理により表面硬度がＨｖ７００を超える特性を
有する焼入性に優れた射出成形粉末冶金用合金鋼を提供
することにある。However, although the Fe-N1-C alloy has good post-workability in the sintered state, its hardenability is insufficient, and the hardness after oil quenching and tempering heat treatment is Vickers hardness (Hv).
It never exceeded 700, and the wear resistance was not excellent. For these reasons, the object of the present invention is to provide injection molding with excellent hardenability, which has post-processability in the sintered state equivalent to that of Fe-Ni-C alloys, and has a surface hardness exceeding Hv700 after heat treatment. The purpose of the present invention is to provide alloy steel for powder metallurgy.
〔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、０．５〜３
重量％のＭｎ、０．３〜１重量％のＣを含有し残部Ｆｅ
よりなる焼入性に優れた射出成形粉末冶金用合金鋼であ
る。[Means for Solving the Problems] The present invention achieves the above object by providing a
Contains weight% Mn, 0.3-1 weight% C, balance Fe
This is an alloy steel for injection molding powder metallurgy with excellent hardenability.
本発明において、Ｍｎは焼入性を改善する元素であり、
またＣは焼入性を良好に保つための必須の元素である。In the present invention, Mn is an element that improves hardenability,
Further, C is an essential element for maintaining good hardenability.
Ｍｎの含有量が０．５重量％未満および、またはＣの含
有量が０．３重量％未満では焼入性が十分でなく、一方
Ｍｎの含有量が３重量％を超えおよび、またはＣの含有
量が１重量％を超えると焼結上りにて硬すぎて後加工性
が低下する。したがってＭｎの含有量を０．５〜３重量
％、Ｃの含有量を０．３〜１重量％とした。If the Mn content is less than 0.5% by weight and/or the C content is less than 0.3% by weight, the hardenability is insufficient, whereas if the Mn content is more than 3% by weight and/or the C content is less than 0.3% by weight, the hardenability is insufficient. If the content exceeds 1% by weight, it will be too hard after sintering, resulting in poor post-workability. Therefore, the Mn content was set to 0.5 to 3% by weight, and the C content was set to 0.3 to 1% by weight.
以上のような組成を有する金属粉末を用意しこれを射出
成形粉末冶金法の原料粉末として使用すればよい。A metal powder having the above composition may be prepared and used as a raw material powder for injection molding powder metallurgy.
粉砕法で作られたＦｅ−７７重量％Ｍｎ母合金微粉末（
平均粒径８μｍ）とカーボンを０．０５重量％および０
．９重量％含有するカーボニルＦｅ粉末（平均粒径５μ
ｍ）と天然黒鉛粉末（平均粒径２２μｍ）を第１表に示
す組成に配合し、有機バインダーを加えて各々１０ｋｇ
混練した。この混練物を金型に射出成形して、幅１０ｍ
ｍ、厚み１０ｍ１、長さ５５ｍ＋のテストピースを得た
（試験Ｎα１〜７）。Fe-77% by weight Mn master alloy fine powder made by pulverization method (
average particle size 8 μm) and 0.05 wt% carbon and 0
．． Carbonyl Fe powder containing 9% by weight (average particle size 5μ)
m) and natural graphite powder (average particle size 22 μm) were blended into the composition shown in Table 1, an organic binder was added, and 10 kg of each was prepared.
Kneaded. This kneaded material was injection molded into a mold with a width of 10 m.
A test piece with a thickness of 10 m and a length of 55 m+ was obtained (tests Nα1 to Nα7).
これらの成形体を窒素雰囲気中で３００°Ｃ迄加熱して
脱バインダーし、その後、半連続式真空焼結炉にて真空
度５ Ｘ １０−” Ｔｏｒｒ 、焼結温度１２５０℃
で健全な焼結体を得た。これらの焼結体は各組成により
若干具なるが９２％から９５％の相対密度比を示してい
た。These molded bodies were heated to 300°C in a nitrogen atmosphere to remove the binder, and then heated in a semi-continuous vacuum sintering furnace at a vacuum degree of 5 x 10-” Torr and a sintering temperature of 1250°C.
A healthy sintered body was obtained. These sintered bodies exhibited a relative density ratio of 92% to 95%, although this differed slightly depending on each composition.
次にこれらの焼結体のビッカース硬度を荷重１０ｋｇで
測定した後、油焼入れおよび焼戻し処理を施した。焼入
条件は８３０°Ｃで３０分間保持後油焼入れ、焼戻し条
件は１７０ ”Ｃで６０分間保持後、空冷とした。最後
にこれらの熱処理体のビッカース硬度を荷重１０ｋｇに
て測定した。Next, the Vickers hardness of these sintered bodies was measured under a load of 10 kg, and then oil quenching and tempering treatments were performed. The quenching conditions were 830°C for 30 minutes followed by oil quenching, and the tempering conditions were 170''C for 60 minutes followed by air cooling.Finally, the Vickers hardness of these heat-treated bodies was measured under a load of 10kg.
更に、カーボンを０．０５重量％および０．９重量％含
有するカーボニルＦｅ粉末（平均粒径５μｍ）とカーボ
ニルＮｉ粉末（平均粒径７μｍ）を第１表に示す組成に
配合した以外は前記と同様にして焼結体を得、ビッカー
ス硬度を測定した（試験Ｎα８）。Furthermore, carbonyl Fe powder (average particle size 5 μm) containing 0.05% by weight and 0.9% by weight of carbon and carbonyl Ni powder (average particle size 7 μm) were blended into the composition shown in Table 1. A sintered body was obtained in the same manner, and its Vickers hardness was measured (test Nα8).
なお、この焼結体の相対密度比は９５％であった。Note that the relative density ratio of this sintered body was 95%.
以上の焼結体および熱処理体の硬度測定結果を第１表に
示す−０
第
■
表
この表から明らかなように本発明の合金は焼結体硬度が
Ｈｖで２７０以下と低く、後加工性が従来合金と同等程
度で、しかも熱処理硬度がＨｖで７００以上と高く焼入
性に優れていることがわかる。The hardness measurement results of the above-mentioned sintered bodies and heat-treated bodies are shown in Table 1. It can be seen that the hardness is comparable to that of conventional alloys, and the heat treatment hardness is as high as 700 or more in Hv, indicating excellent hardenability.
本発明により、焼結体で後加工性がＦｅ−Ｎ１−Ｃ合金
と同等程度で、しかも焼入れおよび焼戻しの熱処理によ
り表面硬度がＨｖ７００を超え耐摩耗性に優れた射出成
形粉末冶金製品を提供することができる。The present invention provides an injection molded powder metallurgy product which is a sintered body and has post-processability comparable to that of Fe-N1-C alloy, and which has a surface hardness exceeding Hv700 after heat treatment of quenching and tempering and has excellent wear resistance. be able to.
特許出願人 住友金属鉱山株式会社Patent applicant: Sumitomo Metal Mining Co., Ltd.
Claims (1)
を含有し残部Ｆｅよりなる焼入性に優れた射出成形粉末
冶金用合金鋼。(1) 0.5-3% by weight of Mn, 0.3-1% by weight of C
An alloy steel for injection molding powder metallurgy that has excellent hardenability and contains Fe with the remainder being Fe.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17723090A JPH0466652A (en) | 1990-07-06 | 1990-07-06 | Alloy steel for injection molding powder metallurgy excellent in hardenability |
| DE69024582T DE69024582T2 (en) | 1989-10-06 | 1990-10-05 | Steel alloy for use in injection-molded powder-metallurgically produced sintered bodies |
| EP90310942A EP0421811B1 (en) | 1989-10-06 | 1990-10-05 | Alloy steel for use in injection molded sinterings produced by powder metallurgy |
| US07/716,742 US5141554A (en) | 1989-10-06 | 1991-06-14 | Injection-molded sintered alloy steel product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17723090A JPH0466652A (en) | 1990-07-06 | 1990-07-06 | Alloy steel for injection molding powder metallurgy excellent in hardenability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0466652A true JPH0466652A (en) | 1992-03-03 |
Family
ID=16027430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17723090A Pending JPH0466652A (en) | 1989-10-06 | 1990-07-06 | Alloy steel for injection molding powder metallurgy excellent in hardenability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0466652A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58107470A (en) * | 1981-12-19 | 1983-06-27 | Kawasaki Steel Corp | Preparation of sintered parts |
| JPS63227751A (en) * | 1987-03-17 | 1988-09-22 | Mitsubishi Metal Corp | Fe sintered alloy synchronizing ring for transmission |
| JPS6462402A (en) * | 1987-08-31 | 1989-03-08 | Sumitomo Electric Industries | Production of spiral precision sintered part by injection molding method |
-
1990
- 1990-07-06 JP JP17723090A patent/JPH0466652A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58107470A (en) * | 1981-12-19 | 1983-06-27 | Kawasaki Steel Corp | Preparation of sintered parts |
| JPS63227751A (en) * | 1987-03-17 | 1988-09-22 | Mitsubishi Metal Corp | Fe sintered alloy synchronizing ring for transmission |
| JPS6462402A (en) * | 1987-08-31 | 1989-03-08 | Sumitomo Electric Industries | Production of spiral precision sintered part by injection molding method |
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