JPH06172943A - Die for hot working excellent in wear resistance - Google Patents
Die for hot working excellent in wear resistanceInfo
- Publication number
- JPH06172943A JPH06172943A JP35206192A JP35206192A JPH06172943A JP H06172943 A JPH06172943 A JP H06172943A JP 35206192 A JP35206192 A JP 35206192A JP 35206192 A JP35206192 A JP 35206192A JP H06172943 A JPH06172943 A JP H06172943A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- die
- mold
- nitriding
- wear resistance
- 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、窒化処理を施したプレ
ス金型、アルミ押出金型などの熱間加工用金型に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot working die such as a press die or an aluminum extrusion die which is subjected to a nitriding treatment.
【０００２】[0002]
【従来の技術】熱間加工用金型の耐久性を増すために、
ＳＫＤ６やＳＫＤ６１などに窒化処理を適用することは
一般に広く普及している。例えば、プレス金型の場合
は、一般に被加工材との摩擦作用により、ヒートクラッ
クと塑性流動が金型表面部に生じることによって損耗す
るが、これに耐える強度や耐摩耗性を付与するため窒化
処理を適用する。さらに、アルミ押出金型の場合、アル
ミ合金と摺動するベアリング面の摩耗を防ぐために耐摩
耗性を付与する目的で窒化処理が適用されている。2. Description of the Related Art In order to increase the durability of hot working molds,
The application of nitriding treatment to SKD6, SKD61, etc. is generally widespread. For example, in the case of a press die, heat cracks and plastic flow generally occur due to frictional action with the work material, causing wear and tear, but nitriding is performed to impart strength and wear resistance to withstand this. Apply processing. Further, in the case of an aluminum extrusion die, a nitriding treatment is applied for the purpose of imparting abrasion resistance in order to prevent abrasion of the bearing surface sliding on the aluminum alloy.
【０００３】[0003]
【発明が解決しようとする課題】ところが、近年、上記
の加工技術の変化により、従来の窒化された金型では要
求特性を満たさない分野が増えてきた。However, in recent years, due to the changes in the above-mentioned processing techniques, the number of fields in which conventional nitrided molds do not satisfy the required characteristics has increased.
【０００４】すなわち、プレス金型の場合、成形サイク
ルの短縮のため鍛造速度を速くする鍛造技術の実用化が
進み、金型表面と被加工材との摩擦作用が過酷となり、
摺動による発熱が大きくなり、金型表面部の軟化や塑性
流動による金型の損耗が早期に進むことが問題となって
いる。また、アルミ押出し金型の場合にも、成形サイク
ルの短縮のため押出し速度を速くする押出し加工技術の
実用化が進み、金型表面と被加工材との摩擦作用がより
過酷となり、従来適用されていた窒化処理では、工具の
損耗が早期に進むことが問題となっている。That is, in the case of a press die, forging technology for increasing the forging speed in order to shorten the molding cycle has been put into practical use, and the frictional action between the die surface and the workpiece becomes severe,
There is a problem that heat generation due to sliding becomes large, and softening of the surface of the mold and wear of the mold due to plastic flow progress at an early stage. In addition, in the case of aluminum extrusion molds as well, the practical application of extrusion technology that accelerates the extrusion speed in order to shorten the molding cycle has progressed, and the frictional action between the mold surface and the work material has become more severe, and it has been conventionally applied. In the conventional nitriding treatment, there is a problem that the wear of the tool progresses at an early stage.
【０００５】従来、ＳＫＤ６、ＳＫＤ６１またはそれら
の改良鋼に代表される5％Cr系の熱間工具鋼では、通常
の焼入れ焼もどし硬さHRC40ないし55の金型に常用の窒
化処理を行なっても、一定の耐摩耗性の向上効果は得ら
れるが、窒化処理を行なう際に窒化層中のＣ濃度が母材
に比べて低い層が生じて耐摩耗性に対して不利となる現
象が発生し、特に耐摩耗性を問題にするような用途に
は、不十分であることが多かった。そこで本発明者は、
金型と高温の被加工材との摩擦現象に着目し、これに及
ぼす最適な窒化層の性状とＣ分布を詳細に検討した結
果、摩擦特性に対して金型母材の炭素量以上の炭素濃度
である窒化層が有効であり、これを実現する窒化処理方
法として、通常の浸炭窒化処理より浸炭性雰囲気を約２
倍に高めることで達成できることを新たに見い出した。Conventionally, in the 5% Cr type hot work tool steel represented by SKD6, SKD61 or their improved steels, even if a die having a normal quenching and tempering hardness HRC40 to 55 is subjected to a conventional nitriding treatment. Although a certain effect of improving the wear resistance can be obtained, a phenomenon in which the C concentration in the nitrided layer is lower than that of the base metal during the nitriding treatment, which is disadvantageous to the wear resistance, occurs. In many cases, it was insufficient for applications where abrasion resistance was a problem. Therefore, the inventor
Focusing on the friction phenomenon between the die and the high-temperature work material, and examining the optimum properties of the nitrided layer and the C distribution on it in detail, as a result, it was found that the carbon content was higher than that of the die base material in terms of friction characteristics. The concentration of the nitriding layer is effective, and as a nitriding treatment method for achieving this, a carburizing atmosphere of about 2
We have newly found what can be achieved by doubling.
【０００６】ところで、熱間加工用金型に窒化処理を行
なって金型の強度、耐摩耗性を高める効果については、
特開昭54-50421号、同54-56913号、同54-110916号、同5
5-93872号に開示されている。しかし、これらは、窒化
を行なった場合に高い表面硬さと深い窒化層が得られや
すい金型用鋼に関するものであり、金型特性面では、強
度や耐摩耗性を向上させる目的にとどまるものである。
本発明が対象とする、とくに金型の耐摩耗性を必要とす
る熱間加工用金型の摩耗を防止する目的で、母材の炭素
量以上の炭素濃度である窒化層を有する熱間加工用金型
は、今まで知られていなかったのである。By the way, regarding the effect of nitriding the die for hot working to enhance the strength and wear resistance of the die,
JP-A-54-50421, 54-56913, 54-110916, 5
No. 5-93872. However, these are related to the mold steel that is likely to obtain a high surface hardness and a deep nitriding layer when nitriding is performed, and in terms of mold characteristics, it is only for the purpose of improving strength and wear resistance. is there.
The hot working having a nitride layer having a carbon concentration equal to or higher than the carbon amount of the base material, for the purpose of preventing wear of the hot working mold, which is particularly targeted for wear resistance of the mold of the present invention The mold has not been known until now.
【０００７】以上述べたように、金型の摩擦条件が過酷
化したことにより、摩耗の問題が顕在化してきたので、
従来の単純な窒化処理だけでは対応できなくなってきて
いる。本発明の目的は、従来は窒化のために窒化層が低
い炭素量を有する金型であったものに対し、窒化層のＣ
分布を制御することにより、摩耗に対して、従来の窒化
層に比べて高い耐摩耗性を付与させた窒化層を有する熱
間加工用金型を提供することである。As described above, since the friction condition of the mold becomes severe, the problem of wear has become apparent.
The conventional simple nitriding process is no longer sufficient. The object of the present invention is to reduce the carbon content of the nitride layer from that of a mold having a low carbon content for the nitride layer in the past.
It is an object of the present invention to provide a die for hot working having a nitrided layer which has higher wear resistance to abrasion than the conventional nitrided layer by controlling distribution.
【０００８】[0008]
【課題を解決するための手段】本発明は、金型表面部と
高温の被加工材との摩擦による摩耗に関し、熱間工具鋼
を窒化した場合の窒化層のＣ分布の影響を詳細に検討し
た結果、摩擦特性に対し、金型表面部の窒素化合物層や
拡散層から成る窒化層は、母材炭素量以上の炭素濃度で
ある窒化層が有効であり、これを実現する窒化処理の方
法として、通常の浸炭窒化処理に比較して約２倍のＣＯ
ガスを供給するよう調整することで達成できることを見
出したものである。本発明の窒化性状を備える熱間加工
用金型を使用することにより、摩耗寿命を問題とするよ
うな成形条件のプレス型やアルミ押出し工具の摩耗寿命
を向上させることが可能となる。DISCLOSURE OF THE INVENTION In the present invention, the influence of the C distribution of the nitrided layer in the case of nitriding hot work tool steel is examined in detail with respect to the wear due to the friction between the surface of the die and the high temperature workpiece. As a result, for the friction characteristics, the nitride layer consisting of the nitrogen compound layer and the diffusion layer on the surface of the mold is effectively a nitride layer having a carbon concentration higher than the carbon amount of the base material. As a result, about twice as much CO
They have found that this can be achieved by adjusting the gas supply. By using the die for hot working having the nitriding property of the present invention, it becomes possible to improve the wear life of the press die and the aluminum extrusion tool under the molding conditions that cause the wear life to be a problem.
【０００９】すなわち、本発明の第１発明は、重量％
で、Ｃ 0.30%〜0.55%、Ｓi 1.20%以下、Ｍn 0.1〜1.5
%、Ｃr 2.55〜6.50%、ＷとＭoの１種または２種を1/2Ｗ
＋Ｍoで1.0〜4.5%、Ｖ 0.2〜1.5%、残部Ｆeおよび不可
避的不純物からなり、少なくとも金型作業面に化合物層
と拡散層から成る窒化層を有し、かつ前記の窒化層は、
母材の炭素量以上の炭素濃度であることを特徴とする耐
摩耗性にすぐれる熱間加工用金型であり、第２発明は、
重量％で、Ｃ 0.30%〜0.55%、Ｓi 1.20%以下、Ｍn0.1〜
1.5%、Ｎi 0.1〜1.5%、Ｃr 2.55〜6.50%、ＷとＭoの１
種または２種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ 0.2〜1.5
%、残部Ｆeおよび不可避的不純物からなり、少なくとも
金型作業面に化合物層と拡散層から成る窒化層を有し、
かつ前記の窒化層は、母材の炭素量以上の炭素濃度であ
ることを特徴とする耐摩耗性にすぐれる熱間加工用金型
である。That is, the first aspect of the present invention is the weight%
, C 0.30% to 0.55%, Si 1.20% or less, Mn 0.1 to 1.5
%, Cr 2.55 to 6.50%, 1/2 type of 1 or 2 types of W and Mo
+ Mo, 1.0 to 4.5%, V 0.2 to 1.5%, balance Fe and unavoidable impurities, and at least a mold working surface has a nitride layer composed of a compound layer and a diffusion layer.
A die for hot working having excellent wear resistance, characterized in that the carbon concentration is equal to or higher than that of the base metal. The second invention is
% By weight, C 0.30% to 0.55%, Si 1.20% or less, Mn 0.1 to
1.5%, Ni 0.1 to 1.5%, Cr 2.55 to 6.50%, W and Mo 1
1.0 to 4.5% at 1 / 2W + Mo, V 0.2 to 1.5
%, The balance Fe and unavoidable impurities, and has a nitride layer composed of a compound layer and a diffusion layer on at least the mold working surface,
Moreover, the above-mentioned nitrided layer has a carbon concentration equal to or higher than the carbon amount of the base material, and is a mold for hot working having excellent wear resistance.
【００１０】第３発明は、重量％で、Ｃ 0.30%〜0.55
%、Ｓi 1.20%以下、Ｍn 0.1〜1.5%、Ｃr 2.55〜6.50%、
ＷとＭoの１種または２種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ
0.2〜1.5%、Ｃo 0.3〜5.0%、残部Ｆeおよび不可避的不
純物からなり、少なくとも金型作業面に化合物層と拡散
層から成る窒化層を有し、かつ前記の窒化層は、母材の
炭素量以上の炭素濃度であることを特徴とする耐摩耗性
にすぐれる熱間加工用金型であり、第４発明は、重量％
で、Ｃ 0.30%〜0.55%、Ｓi 1.20%以下、Ｍn 0.1〜1.5
%、Ｎi 0.1〜1.5%、Ｃr 2.55〜6.50%、ＷとＭoの１種ま
たは２種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ 0.2〜1.5%、Ｃo
0.3〜5.0%、残部Ｆeおよび不可避的不純物からなり、
少なくとも金型作業面に化合物層と拡散層から成る窒化
層を有し、かつ前記の窒化層は、母材の炭素量以上の炭
素濃度であることを特徴とする耐摩耗性にすぐれる熱間
加工用金型である。The third invention is, in% by weight, C 0.30% to 0.55.
%, Si 1.20% or less, Mn 0.1 to 1.5%, Cr 2.55 to 6.50%,
1.0 to 4.5% with 1/2 W + Mo for 1 or 2 types of W and Mo, V
0.2 to 1.5%, Co 0.3 to 5.0%, balance Fe and unavoidable impurities, and a nitride layer composed of a compound layer and a diffusion layer at least on the work surface of the mold, and the nitride layer is carbon of the base material. A die for hot working excellent in wear resistance, characterized in that the carbon concentration is not less than a certain amount.
, C 0.30% to 0.55%, Si 1.20% or less, Mn 0.1 to 1.5
%, Ni 0.1 to 1.5%, Cr 2.55 to 6.50%, 1 or 2 kinds of W and Mo at 1 / 2W + Mo 1.0 to 4.5%, V 0.2 to 1.5%, Co
0.3-5.0%, balance Fe and unavoidable impurities,
At least a nitride layer consisting of a compound layer and a diffusion layer is provided on the work surface of the die, and the nitride layer has a carbon concentration of at least the carbon amount of the base material, and is excellent in wear resistance. It is a processing mold.
【００１１】第５発明は、重量％で、Ｃ 0.30%〜0.55
%、Ｓi 1.20%以下、Ｍn 0.1〜1.5%、Ｃr 2.55〜6.50%、
ＷとＭoの１種または２種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ
0.2〜1.5%、Ｎb、Ｔa、Ｔi、の１種または２種以上を
合計で0.03〜0.40％、残部Ｆeおよび不可避的不純物か
らなり、少なくとも金型作業面に化合物層と拡散層から
成る窒化層を有し、かつ前記の窒化層は、母材の炭素量
以上の炭素濃度であることを特徴とする耐摩耗性にすぐ
れる熱間加工用金型であり、第６発明は、重量％で、Ｃ
0.30%〜0.55%、Ｓi 1.20%以下、Ｍn 0.1〜1.5%、Ｎi
0.1〜1.5%、Ｃr 2.55〜6.50%、ＷとＭoの１種または２
種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ 0.2〜1.5%、Ｎb、Ｔ
a、Ｔi、の１種または２種以上を合計で0.03〜0.40％、
残部Ｆeおよび不可避的不純物からなり、少なくとも金
型作業面に化合物層と拡散層から成る窒化層を有し、か
つ前記の窒化層は、母材の炭素量以上の炭素濃度である
ことを特徴とする耐摩耗性にすぐれる熱間加工用金型で
ある。The fifth aspect of the invention is C 0.30% to 0.55% by weight.
%, Si 1.20% or less, Mn 0.1 to 1.5%, Cr 2.55 to 6.50%,
1.0 to 4.5% with 1/2 W + Mo for 1 or 2 types of W and Mo, V
Nitride layer consisting of 0.2 to 1.5%, one or more of Nb, Ta, and Ti in total of 0.03 to 0.40%, the balance Fe and unavoidable impurities, and a compound layer and a diffusion layer at least on the mold working surface. And the above-mentioned nitrided layer is a die for hot working excellent in wear resistance, characterized in that the carbon concentration is equal to or higher than the carbon amount of the base material. , C
0.30% to 0.55%, Si 1.20% or less, Mn 0.1 to 1.5%, Ni
0.1 to 1.5%, Cr 2.55 to 6.50%, one of W and Mo or 2
Seed with 1 / 2W + Mo 1.0-4.5%, V 0.2-1.5%, Nb, T
a, Ti, one or more of 0.03 to 0.40% in total,
A nitride layer composed of the balance Fe and unavoidable impurities and having a compound layer and a diffusion layer at least on the work surface of the die, and the nitride layer has a carbon concentration higher than that of the base metal. It is a mold for hot working with excellent wear resistance.
【００１２】第７発明は、重量％で、Ｃ 0.30%〜0.55
%、Ｓi 1.20%以下、Ｍn 0.1〜1.5%、Ｃr 2.55〜6.50%、
ＷとＭoの１種または２種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ
0.2〜1.5%、Ｃo 0.3〜5.0%、Ｎb、Ｔa、Ｔi、の１種ま
たは２種以上を合計で0.03〜0.40％、残部Ｆeおよび不
可避的不純物からなり、少なくとも金型作業面に化合物
層と拡散層から成る窒化層を有し、かつ前記の窒化層
は、母材の炭素量以上の炭素濃度であることを特徴とす
る耐摩耗性にすぐれる熱間加工用金型であり、第８発明
は、重量％で、Ｃ 0.30%〜0.55%、Ｓi 1.20%以下、Ｍn
0.1〜1.5%、Ｎi 0.1〜1.5%、Ｃr 2.55〜6.50%、ＷとＭo
の１種または２種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ 0.2〜
1.5%、Ｃo 0.3〜5.0%、Ｎb、Ｔa、Ｔi、の１種または２
種以上を合計で0.03〜0.40％、残部Ｆeおよび不可避的
不純物からなり、少なくとも金型作業面に化合物層と拡
散層から成る窒化層を有し、かつ前記の窒化層は、母材
の炭素量以上の炭素濃度であることを特徴とする耐摩耗
性にすぐれる熱間加工用金型である。The seventh invention is, in% by weight, C 0.30% to 0.55.
%, Si 1.20% or less, Mn 0.1 to 1.5%, Cr 2.55 to 6.50%,
1.0 to 4.5% with 1/2 W + Mo for 1 or 2 types of W and Mo, V
0.2 to 1.5%, Co 0.3 to 5.0%, one or more of Nb, Ta and Ti, 0.03 to 0.40% in total, the balance Fe and unavoidable impurities, and at least a compound layer on the work surface of the mold. A die for hot working having excellent wear resistance, characterized in that it has a nitride layer formed of a diffusion layer, and the nitride layer has a carbon concentration higher than that of the base metal. The invention is, by weight%, C 0.30% to 0.55%, Si 1.20% or less, Mn
0.1 to 1.5%, Ni 0.1 to 1.5%, Cr 2.55 to 6.50%, W and Mo
1 or 2 of 1.0 to 4.5% at 1/2 W + Mo, V 0.2 to
1.5%, Co 0.3 to 5.0%, Nb, Ta, Ti, 1 or 2
The total amount of seeds is 0.03 to 0.40%, the balance is Fe and unavoidable impurities, and at least the work surface of the mold has a nitride layer composed of a compound layer and a diffusion layer. A hot working die having excellent wear resistance, which is characterized by having the above carbon concentration.
【００１３】[0013]
【作用】本発明金型の窒化層のＣ分布の特徴について述
べる。熱間加工用金型の損耗現象は、様々な要因によっ
て発生するが、金型表面と高温の被加工材との摩擦によ
る発熱をともなう金型表層部の軟化により、塑性流動が
生じ易くなることが大きな要因のひとつである。そし
て、摩擦による発熱が大きい場合には、型材の変態点を
越えて、型表層部に再焼入層を生じる場合がしばしば観
察される。The function of the C distribution of the nitride layer of the mold of the present invention will be described. The wear phenomenon of the hot working die is caused by various factors, but the plastic surface is likely to be generated due to the softening of the die surface layer part accompanied by heat generation due to friction between the die surface and the high temperature workpiece. Is one of the major factors. When the heat generated by friction is large, it is often observed that a re-quenched layer is formed on the surface layer of the mold beyond the transformation point of the mold material.
【００１４】例えば、ＳＫＤ６やＳＫＤ６１に代表され
る5％Cr系の熱間工具鋼を、通常の焼入れ焼もどし熱処
理を施してHRC40ないし55の硬さに金型を調質し後、窒
化処理を施した場合には、鉄と窒素の化合物を生成し、
金型の最表層部に化合物層が形成される。また母材に形
成される拡散層内にも化合物が分散形成されるが、これ
らが母相と被加工材との金属同士が直接接触するのを低
減し、摺動性や耐摩耗性を改善することはよく知られて
いる。一方、鉄と窒素の化合物にはε相とγ´相の２種
類があり、Ｃを比較的多く固溶するε相は、Ｃの固溶限
が小さいγ´相に比べ、摺動性や耐摩耗性が優れている
ことも周知である。For example, 5% Cr hot work tool steel typified by SKD6 and SKD61 is subjected to normal quenching and tempering heat treatment to heat the die to the hardness of HRC40 to 55, and then nitriding treatment. When applied, it produces a compound of iron and nitrogen,
A compound layer is formed on the outermost layer of the mold. Compounds are also dispersed and formed in the diffusion layer formed in the base material, but these reduce the direct contact between the metal of the base phase and the metal of the work material, and improve the slidability and wear resistance. It is well known to do. On the other hand, there are two types of compounds of iron and nitrogen, the ε phase and the γ ′ phase, and the ε phase in which a relatively large amount of C forms a solid solution has a slidability and It is also well known that it has excellent wear resistance.
【００１５】ところが、従来の窒化方法のうち、N2、
H2、Arガス中で窒化を行うイオン窒化法やNH3ガス中で
窒化を行うガス窒化法などは、浸炭性のガスを含まない
雰囲気中で窒化処理を行なうため、最表層部の化合物層
内にはＣの固溶限が小さいγ´相が多く形成される。さ
らに、化合物層直下の拡散層内では、窒化反応によって
生成し、母材中を自由に動く遊離Ｃが、外から侵入する
Ｎにより、母材内部へと拡散するため、母材に比べてＣ
濃度の低い層が発生する。しかも、この領域では、ε相
はほとんど生成せず、γ´相が主に生成する。However, among the conventional nitriding methods, N 2 ,
In the ion nitriding method of nitriding in H 2 or Ar gas or the gas nitriding method of nitriding in NH 3 gas, the nitriding treatment is performed in an atmosphere containing no carburizing gas, and thus the compound layer at the outermost layer is used. A large amount of γ'phase in which the solid solubility limit of C is small is formed therein. Furthermore, in the diffusion layer immediately below the compound layer, free C that is generated by the nitriding reaction and moves freely in the base material diffuses into the base material due to N penetrating from the outside.
A low-density layer occurs. Moreover, in this region, the ε phase is hardly generated, and the γ ′ phase is mainly generated.
【００１６】ところで、これらの窒化処理の他、浸炭雰
囲気中の窒化方法としてタフトライドに代表される塩浴
窒化法があるが、該方法では化合物層に脱炭現象を起こ
すことが報告されている（P.F.Colijn，E.J.Mittemeije
r，H.C.F.Rozendaal 著，Z.Metalkde 74(1983)9,P.620
〜626)。本発明の対象となる熱間加工用金型材料につい
ても表層部に母材のＣ濃度より低い層があることが観察
された。つまり、従来の浸炭窒化処理は、せいぜい窒化
処理によって起こる被処理材表面部のＣ濃度が低下する
のを補う程度か、または上述のようにＣ濃度が母材のＣ
濃度より低い部分が生じているのである。In addition to these nitriding treatments, there is a salt bath nitriding method typified by tuftride as a nitriding method in a carburizing atmosphere, and it has been reported that this method causes a decarburization phenomenon in a compound layer ( PFColijn, EJ Mittemeije
r, HCF Rozendaal, Z. Metalkde 74 (1983) 9, P. 620
~ 626). It was also observed that the hot working die material of the present invention also had a layer in the surface layer portion having a C concentration lower than that of the base material. In other words, the conventional carbonitriding treatment is to the extent that it compensates for a decrease in the C concentration on the surface of the material to be treated, which is caused by the nitriding treatment, or, as described above, that the C concentration is C of the base metal.
The part lower than the density is generated.
【００１７】これに対して本発明の熱間加工用金型は、
例えば浸炭性のCOガスを含むガス中で窒化を行うイオン
浸炭窒化処理やガス軟窒化処理時に、通常の浸炭窒化に
比較して、より積極的にＣの供給を行なうことで達成で
きる。その結果、金型の最表層部の化合物相はほとんど
ε単相となるうえ、拡散層内にもε相が分布するように
なり、窒化層全部が母材の炭素量以上の炭素濃度とな
る。このため、高温の被加工材と摺動させると、前記の
窒化層と比較して、摩擦発熱の小さい窒化層を得ること
ができる。上記の効果を得るために、本願発明の熱間加
工用金型は、少なくとも金型作業面に化合物層と拡散層
から成る窒化層を有し、かつ、前記窒化層は母材の炭素
量以上の炭素濃度であることとする。On the other hand, the hot working die of the present invention is
For example, it can be achieved by more positively supplying C as compared with normal carbonitriding during ion carbonitriding or gas nitrocarburizing in which nitriding is performed in a gas containing carburizing CO gas. As a result, the compound phase in the outermost layer of the mold is almost a single ε phase, and the ε phase is distributed in the diffusion layer as well, and the entire nitride layer has a carbon concentration higher than the carbon amount of the base metal. . Therefore, when it slides on a high-temperature work material, a nitrided layer with less frictional heat generation can be obtained as compared with the above-mentioned nitrided layer. In order to obtain the above effect, the hot working die of the present invention has a nitride layer composed of a compound layer and a diffusion layer on at least the die working surface, and the nitride layer is equal to or more than the carbon amount of the base material. The carbon concentration of
【００１８】このように、本発明の最も特徴とするとこ
ろは、金型作業面の窒化層内の炭素濃度を母材の炭素量
以上とすることで、従来の金型に比べ耐摩耗性の向上を
初めて達成できたのである。本発明の熱間加工用金型
は、耐摩耗性の高い窒化層を付与した状態が特徴である
が、その効果を最大に発揮するためには、特定の金型成
分範囲とすることが必要である。以下に本発明の熱間加
工用金型の材料となる成分範囲の限定理由について述べ
る。As described above, the most characteristic feature of the present invention is that the carbon concentration in the nitride layer on the working surface of the die is set to be equal to or more than the carbon amount of the base material, so that the abrasion resistance is higher than that of the conventional die. The improvement was achieved for the first time. The mold for hot working of the present invention is characterized by a state in which a nitride layer having high wear resistance is provided, but in order to maximize its effect, it is necessary to set within a specific mold component range. Is. The reasons for limiting the range of components used as the material for the hot working mold of the present invention will be described below.
【００１９】Ｃは、本発明鋼のすぐれた焼入性、焼もど
し硬さ、および高温硬さを維持し、またＷ、Ｍo、Ｖ、
Ｃrなどの炭化物形成元素と結合して炭化物を形成し、
結晶粒の微細化効果、耐摩耗性、焼もどし軟化抵抗、高
温硬さを与えるために添加する。上記の効果を得るため
に、Ｃは最低0.30%が必要である。多すぎると過度の炭
化物の析出をまねき靭性を低下させるので0.55%以下に
限定する。Ｓiは、本発明の金型の耐酸化性を付与する
ため1.2%以下添加する。Ｍnは、焼入性を向上させる
が、多すぎるとＡ1変態点を過度に低下させ、焼なまし
硬さを過度に高くし、被切削性を低下させるので0.1〜
1.50%とする。C maintains the excellent hardenability, tempering hardness, and high-temperature hardness of the steel of the present invention, and W, Mo, V,
Combines with a carbide forming element such as Cr to form a carbide,
It is added to give the effect of refining crystal grains, abrasion resistance, temper softening resistance, and high temperature hardness. To obtain the above effect, C must be at least 0.30%. If it is too large, excessive precipitation of carbides will occur and the toughness will decrease, so it is limited to 0.55% or less. Si is added in an amount of 1.2% or less in order to impart the oxidation resistance of the mold of the present invention. Mn improves the hardenability, but if it is too much, the A 1 transformation point is excessively lowered, the annealing hardness is excessively increased, and the machinability is lowered, so that it is 0.1 to 0.1%.
1.50%
【００２０】Ｃrは、適正な添加量の設定により、焼も
どし軟化抵抗および高温強度の向上、Ｃと結合して炭化
物を形成することによる耐摩耗性の向上、焼入性の向上
および窒化性付与の効果を有するものであり、2.55%以
上の添加が必要である。Ｃｒは本発明の窒化に関してと
くに重要な元素である。窒化処理における窒化反応中、
Ｃｒは窒素と結びついて拡散層内に極めて微細な分散窒
化物を形成し、本発明金型の表面の硬さや高温強度を向
上させ耐摩耗性向上効果を付与する。多すぎると本発明
鋼の高温強度を低下させるため、6.50%以下とする。By adding an appropriate amount of Cr, the resistance to tempering softening and the high temperature strength are improved, the wear resistance is improved by forming a carbide by combining with C, the hardenability is improved and the nitriding property is imparted. It has the effect of, and it is necessary to add 2.55% or more. Cr is a particularly important element for the nitriding of the present invention. During the nitriding reaction in the nitriding process,
Cr combines with nitrogen to form an extremely fine dispersed nitride in the diffusion layer, which improves the hardness and high temperature strength of the surface of the mold of the present invention and imparts the effect of improving wear resistance. If it is too large, the high temperature strength of the steel of the present invention will be reduced, so it is made 6.50% or less.
【００２１】Ｗ，Ｍo量の設定は本発明鋼の用途に必要
とされる高温強度、軟化抵抗を保つ上で重要である。
Ｗ，Ｍoは、焼もどし処理時に微細な特殊炭化物を析出
して、軟化抵抗、高温強度を高める。ただし過度の添加
は過度の炭化物の析出をまねき靭性を低下させるので、
金型、工具の使用条件に応じた強度、高温強度に基づい
て、ＷとＭoの１種または２種を1/2Ｗ＋Ｍoで1.0〜4.5%
添加する。The setting of the amounts of W and Mo is important for maintaining the high temperature strength and softening resistance required for the use of the steel of the present invention.
W and Mo precipitate fine special carbides during the tempering treatment to enhance softening resistance and high temperature strength. However, excessive addition causes precipitation of excessive carbides and reduces toughness, so
1.0 to 4.5% for 1 / 2W + Mo for 1 or 2 types of W and Mo based on the strength and high temperature strength according to the usage conditions of the mold and tool.
Added.
【００２２】Ｖは、固溶しにくい炭化物を形成して耐摩
耗性および耐焼付性の向上に効果を有するものであり、
焼入加熱時には基地中に固溶し、焼もどし時に微細な凝
集しにくい炭化物を析出して高い温度域における軟化抵
抗を大とし、大きな高温耐力を与えるための重要な元素
である。また、結晶粒を微細化して靭性を向上させると
ともに、Ａ1変態点を上げ、優れた高温耐力とあいまっ
て、耐ヒートクラック性を向上させる効果をもたらすも
のである。本発明鋼の特徴である優れた靭性と高温強度
とを兼備させるためにＶ量の設定は非常に重要である。
多すぎると巨大な炭化物を生成し熱間加工方向に沿う紐
状炭化物の分布傾向を増大させ、その方向に沿うクラッ
クの進展を助長するため、1.5%以下とし、低すぎると型
表面部の早期軟化をまねくなど、上記添加の効果が得ら
れないので0.2%以上とする。V forms a carbide that is difficult to form a solid solution and has an effect of improving wear resistance and seizure resistance.
It is an important element for forming a solid solution in the matrix during quenching and heating, precipitating fine carbides that are hard to agglomerate during tempering, increasing the softening resistance in a high temperature range, and providing a large high temperature proof stress. Further, it has the effect of improving the toughness by refining the crystal grains, raising the A 1 transformation point, and improving the heat crack resistance in combination with the excellent high temperature proof stress. The setting of the amount of V is very important in order to combine the excellent toughness and the high temperature strength which are the characteristics of the steel of the present invention.
If too much, huge carbides are generated and the distribution tendency of string-like carbides along the hot working direction is increased, and it promotes the development of cracks along that direction. The effect of the above addition, such as softening, cannot be obtained, so the content is made 0.2% or more.
【００２３】ＮiはＣ, Ｃr, Ｍn, Ｍo, Ｗなどとともに
本発明鋼に優れた焼入性を付与し、緩やかな焼入冷却速
度の場合にも、マルテンサイト主体の組織を形成させ、
靭性の低下を防ぐ作用があり、また基地の本質的な靭性
改善効果を与えるため、必要に応じて添加する。Ｎiは
上記効果を得るために、最低0.1%必要であるが、多すぎ
るとＡ1変態点を過度に低下させ、へたり寿命の低下を
まねき、焼なまし硬さを過度に高くして機械加工性を低
下させるため1.5%以下とする。Ni, together with C, Cr, Mn, Mo, W, etc., imparts excellent hardenability to the steel of the present invention and forms a martensite-based structure even at a slow quenching cooling rate.
It has an action to prevent the deterioration of toughness and gives an essential toughness improving effect of the matrix, so it is added as necessary. Ni is required to be at least 0.1% to obtain the above effect, but if it is too much, the A1 transformation point will be excessively lowered, leading to shortened fatigue life, and excessively increased annealing hardness for machining. In order to reduce the property, it is made 1.5% or less.
【００２４】Ｃoは、使用中の昇温時、きわめて緻密で
密着性の良い保護酸化皮膜を形成し、これにより相手材
との間の金属接触を防ぎ、金型表面の温度上昇を防ぐと
ともに優れた耐摩耗性をもたらす効果を有するため、必
要に応じて添加する。ただし、この酸化皮膜は厚くなり
すぎると金型表面の肌あれをまねき逆効果となるが、Ｃ
oは酸化皮膜の形成速度や厚みを抑える効果を持つ。Ｃo
は上記効果を付与するために添加するとよいが、多すぎ
ると靭性を低下させるので5.0%以下とし、低すぎると上
記添加の効果が得られないので0.3%以上とする。Ｎb、
Ｔa、Ｔiはいずれも焼入れ加熱保持中の結晶粒の成長を
抑制し、結晶粒を微細化し、金型材の靱性値を高める作
用があるため、添加する場合にはＮb、Ｔa、Ｔiの１種
または２種以上を合計で0.03%以上添加する。しかし、
多すぎると、粗大な炭化物が生じ、却って金型材の靱性
値を低下させるため0.40％以下とする。Co forms a protective oxide film that is extremely dense and has good adhesion when the temperature rises during use. This prevents metal contact with the mating material, prevents temperature rise on the die surface, and is excellent. Since it has the effect of providing abrasion resistance, it is added if necessary. However, if this oxide film becomes too thick, it causes the roughening of the mold surface and has the opposite effect.
o has the effect of suppressing the rate and thickness of oxide film formation. Co
Is added to impart the above effect, but if it is too much, the toughness is reduced, so it is 5.0% or less, and if it is too low, the effect of the above addition cannot be obtained, so it is made 0.3% or more. Nb,
Each of Ta and Ti has the effect of suppressing the growth of crystal grains during quenching and heating, refining the crystal grains, and increasing the toughness of the die material. Therefore, when added, one of Nb, Ta, and Ti is used. Alternatively, add two or more kinds in total at 0.03% or more. But,
If it is too large, coarse carbides are generated, and rather the toughness value of the die material is lowered, so the content is made 0.40% or less.
【００２５】[0025]
（実施例１）以下、本発明を実施例に基づき詳細に説明
する。表１に示す本発明が対象とする組成範囲内の素材
を準備した。このうち、JISSKD61である鋼１から試験片
を作製して摺動試験を行なった。この摺動試験は、直径
が5mmで長さが40mmの試験片を1540rpmで回転させ、その
端面を600℃に加熱したSNCM439鋼に所定の荷重で押し付
ける方法で、荷重は30kgないし80kgで行ない、座屈が生
じる荷重を限界荷重とした。(Example 1) Hereinafter, the present invention will be described in detail based on examples. Materials within the composition range targeted by the present invention shown in Table 1 were prepared. Of these, a test piece was prepared from JIS SKD61 steel 1 and a sliding test was conducted. This sliding test is a method in which a test piece having a diameter of 5 mm and a length of 40 mm is rotated at 1540 rpm, and the end surface thereof is pressed against SNCM439 steel heated to 600 ° C. with a predetermined load, the load is 30 kg to 80 kg, The limit load was the load at which buckling occurred.
【００２６】なお、比較金型の試験片１〜３および本発
明金型の試験片１、２は、鋼１をHRC47に焼入れ焼もど
ししたのちそれぞれの窒化処理を行なった。このうち、
本発明金型の試験片に施した浸炭窒化処理は、通常の処
理に比較して約２倍のCOガスを供給するよう調整しなが
ら実施した。すなわち、真空ガス軟窒化は窒素ガスとCO
ガスの体積比が1:1、またイオン浸炭窒化は窒素ガスとC
Oガスの体積比が3:1となるよう調整した。上記の条件で
各試験片に窒化処理を施した試料について摺動試験を行
なった結果を表２に示す。The test pieces 1 to 3 of the comparative mold and the test pieces 1 and 2 of the mold of the present invention were obtained by quenching and tempering the steel 1 to HRC47, and then nitriding each. this house,
The carbonitriding treatment applied to the test piece of the mold of the present invention was performed while adjusting so as to supply about twice as much CO gas as compared with the usual treatment. That is, vacuum gas soft nitriding is performed with nitrogen gas and CO
The volume ratio of gas is 1: 1, and ion carbonitriding is nitrogen gas and C
The volume ratio of O gas was adjusted to 3: 1. Table 2 shows the results of the sliding test performed on the samples obtained by subjecting each test piece to the nitriding treatment under the above conditions.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【表２】 [Table 2]
【００２９】また、摺動試験で座屈を生じ、表層部が再
焼入状態になった例の断面金属組織を変化しなかった例
と比較して図１に、さらに、それぞれの試験片の表層部
断面の窒化組織と、ＥＰＭＡで分析したＣ分布を図２〜
６に示す。図２〜６の窒化組織は村上試薬（10KOH水溶
液 100ml中に10gのK3Fe(CN)6を溶かした赤血塩アルカリ
液）で腐食したもので、本発明金型の試験片１、２は最
表面の化合物層が黒く着色されているのに対し、比較金
型の試験片１、２は着色されない。両者の試料を表面よ
りＸ線回折法により化合物層の同定を行った結果、本発
明金型の試験片１、２はε相のみ同定されたのに対し、
比較金型の試験片１、２はεとγ´の両層が同定され、
γ´相のピーク強度の方が強かった。また比較金型の試
験片１、２の化合物層直下の拡散層内に化合物のほとん
ど析出していない層が認められ、この層が母材よりＣが
低下している層と一致している。一方、比較金型の試験
片３の化合物層内にくさび状の組織が観察されるが、こ
の部分が母材よりＣが低下している部分であった。表２
にこれらの化合物層と拡散層に母材と比較してＣ濃度の
低下のあるものに×印を示した。In addition, in comparison with an example in which the cross-section metallographic structure of the example in which the buckling occurred in the sliding test and the surface layer portion was in the re-quenched state was shown in FIG. Fig. 2 shows the nitrided structure of the surface layer section and the C distribution analyzed by EPMA.
6 shows. The nitriding structures in FIGS. 2 to 6 were corroded by Murakami reagent (red blood salt alkaline solution obtained by dissolving 10 g of K 3 Fe (CN) 6 in 100 ml of 10 KOH aqueous solution), and the test pieces 1 and 2 of the mold of the present invention. The compound layer on the outermost surface is colored black, while the test pieces 1 and 2 of the comparative mold are not colored. As a result of identifying the compound layer from the surface of both samples by the X-ray diffraction method, only the ε phase was identified in the test pieces 1 and 2 of the mold of the present invention.
In the test pieces 1 and 2 of the comparative mold, both ε and γ ′ layers were identified,
The peak intensity of the γ'phase was stronger. In addition, a layer in which almost no compound was precipitated was observed in the diffusion layer immediately below the compound layer of the test pieces 1 and 2 of the comparative mold, and this layer coincides with the layer in which C is lower than that of the base material. On the other hand, although a wedge-shaped structure was observed in the compound layer of the test piece 3 of the comparative mold, this portion was a portion in which C was lower than that of the base material. Table 2
The cross mark indicates that the compound layer and the diffusion layer had a lower C concentration than the base material.
【００３０】前記のようにＣ濃度の低下の生じた部分に
はε相が生成しないため、比較金型の試験片１〜３はＣ
濃度の低下のない本発明金型の試験片１、２に比べ、低
い荷重で表層部が再焼入れ状態になり、座屈が生じた。
本発明の金型の窒化組織は、ガス軟窒化、イオン浸炭窒
化、真空ガス軟窒化のいずれでもCOガスの体積比を通常
の浸炭窒化処理時より高めて窒化処理を行なうことによ
って、実現できる。As described above, since the ε phase is not generated in the portion where the C concentration is lowered, the test pieces 1 to 3 of the comparative mold have the C content.
Compared with the test pieces 1 and 2 of the mold of the present invention in which the concentration did not decrease, the surface layer portion was re-quenched at a lower load, and buckling occurred.
The nitriding structure of the die of the present invention can be realized by performing the nitriding treatment in any of gas nitrocarburizing, ion carbonitriding, and vacuum gas nitrocarburizing by increasing the volume ratio of CO gas to a level higher than that in the normal carbonitriding treatment.
【００３１】（実施例２）以下、本発明を熱間プレス金
型に実施した例を示す。表１に示す鋼１〜１１の組成の
素材を準備し、これから熱間プレス金型を製作し、実用
テストを行なった結果を表３に示す。なお、本発明の金
型に施した浸炭窒化処理は、実施例１で実施した方法と
同じようにCOガスを多く供給しながら実施した。金型は
自動車部品作る入れ子型であり、寸法は幅220mm、長さ3
30mm、厚み180mmである。鍛造温度は1150℃であり、最
大能力1500tのクランクプレスで、毎分40ショットの速
度で成形を行なった。(Example 2) An example in which the present invention is applied to a hot press die will be shown below. Table 3 shows the results obtained by preparing raw materials having the compositions of steels 1 to 11 shown in Table 1, manufacturing hot pressing dies from the raw materials, and performing practical tests. The carbonitriding treatment applied to the mold of the present invention was carried out while supplying a large amount of CO gas, as in the method carried out in Example 1. The mold is a nested mold for making automobile parts, the dimensions are 220mm in width and 3 in length.
It has a thickness of 30 mm and a thickness of 180 mm. The forging temperature was 1150 ° C, and molding was performed at a speed of 40 shots per minute with a crank press having a maximum capacity of 1500t.
【００３２】[0032]
【表３】 [Table 3]
【００３３】表３において、鋼１はJIS SKD61である。
熱処理は熱間プレス金型に荒加工後、 鋼１、鋼３、
４、５は1020℃加熱後、鋼２、６、９は1100℃加熱後、
鋼７、８、１０、１１は1140℃加熱後、200℃の油に浸
漬する油焼入れ後、焼もどしにて所定の硬さとなるごと
く焼もどしを行なった。仕上げ加工後、比較金型にはガ
ス窒化あるいはイオン窒化あるいはタフトライド処理
を、本発明金型には実施例１と同じ要領で、真空ガス軟
窒化あるいはイオン浸炭窒化処理を行なった。表３にこ
れらの熱間プレス金型の型寿命を示す。該金型は成形速
度が速いため、被加工材と金型の摺動速度が速く、摩擦
発熱による摩耗が早期に進行しやすい。しかし、本発明
の窒化処理を行なうことによって、摩耗寿命が大きく改
善された。In Table 3, Steel 1 is JIS SKD61.
Heat treatment is performed by roughing the hot press die, then steel 1, steel 3,
4, 5 after heating at 1020 ℃, steel 2, 6, 9 after heating at 1100 ℃,
Steels 7, 8, 10 and 11 were heated at 1140 ° C., oil-quenched by immersing them in oil at 200 ° C., and then tempered to a predetermined hardness. After finishing, the comparative mold was subjected to gas nitriding, ion nitriding or tuftride treatment, and the mold of the present invention was subjected to vacuum gas nitrocarburizing or ion carbonitriding treatment in the same manner as in Example 1. Table 3 shows the die lives of these hot press dies. Since the molding speed of the mold is high, the sliding speed between the work material and the mold is high, and wear due to frictional heat generation is likely to progress early. However, by performing the nitriding treatment of the present invention, the wear life was greatly improved.
【００３４】（実施例３）以下、本発明をアルミ押出し
金型に実施した例を示す。表１に示す鋼１２の組成の素
材を準備し、これからアルミ押出し金型を製作し、 実
用テストを行なった結果を表４に示す。金型は住宅用サ
ッシを押出しで中空製品とするホローダイスであり、直
径200mm、厚み65mmの外殻寸法に、矩形（20mm×50mm）
中空部マンドレルと２ポートをもつ雄型に雌型を組み合
わせたものである。さらに押出し圧力は60kgf/mmであ
り、押出製品速度は100m/secで、通常よりかなり速いも
のである。アルミ合金のビレット温度は450℃であり、
ダイスの予熱温度も450℃である。熱処理はアルミ押出
し金型に荒加工後、1020℃加熱後、200℃以下まで強風
をあてて冷却する衝風焼入れ後、焼もどしにて所定の硬
さとなるごとく焼もどしを行なった。仕上げ加工後、比
較例には、タフトライド窒化処理を、本発明には通常よ
り多くCOガスを供給しながら真空窒化処理を行なった。(Example 3) An example in which the present invention is applied to an aluminum extrusion die will be shown below. A raw material having the composition of steel 12 shown in Table 1 is prepared, an aluminum extrusion die is manufactured from this material, and the results of practical tests are shown in Table 4. The mold is a hollow blade made by extruding a residential sash into a hollow product. The outer shell has a diameter of 200 mm and a thickness of 65 mm, and has a rectangular shape (20 mm x 50 mm).
This is a combination of a male type with a hollow mandrel and two ports and a female type. Further, the extrusion pressure is 60 kgf / mm, and the extrusion product speed is 100 m / sec, which is considerably faster than usual. The billet temperature of aluminum alloy is 450 ℃,
The die preheating temperature is also 450 ° C. The heat treatment was carried out by roughing an aluminum extrusion die, heating it at 1020 ° C., then quenching it with a strong wind to cool it to 200 ° C. or less, and then tempering it to a predetermined hardness by tempering. After finishing, a tuftride nitriding treatment was carried out for the comparative example, and a vacuum nitriding treatment was carried out for the present invention while supplying more CO gas than usual.
【００３５】[0035]
【表４】 [Table 4]
【００３６】表４にこれらの押出し金型の寿命状況を示
す。押出し金型はアルミ合金ビレットと摺動するベアリ
ング面の耐摩耗性を保持するため繰り返し窒化するが、
従来 の窒化法の場合、金型寿命が短いうえに、繰り返
し窒化回数が多く、本発明金型は窒化一回あたりの押出
本数が多く、金型寿命も大きな改善効果が認められる。Table 4 shows the life of these extrusion dies. The extrusion die is repeatedly nitrided to maintain the wear resistance of the bearing surface that slides with the aluminum alloy billet,
In the case of the conventional nitriding method, the life of the mold is short and the number of times of repeated nitriding is large. Therefore, the mold of the present invention has a large number of extrusions per nitriding, and the mold life is greatly improved.
【００３７】[0037]
【発明の効果】以上に記述したように、本発明熱間加工
用金型は従来金型より耐摩耗性に優れ、熱間プレス金型
の耐摩耗寿命向上あるいは、アルミ押出し金型の繰り返
し窒化回数を減らすことができ、使用寿命を与える金型
を製造することができる。As described above, the mold for hot working of the present invention is superior in wear resistance to the conventional mold, and has improved wear resistance life of the hot press mold or repeated nitriding of the aluminum extrusion mold. It is possible to manufacture a mold that can be reduced in number of times and that has a service life.
【図１】600℃に加熱した被加工材に高速で摺動させた
試験片の摺動面断面の金属組織を示した写真であり、表
２中の比較金型相当の試験片１と本発明金型相当の試験
片１について示したもので、（ ）内は試験荷重を示し
ている。FIG. 1 is a photograph showing a metallographic structure of a cross section of a sliding surface of a test piece which was slid at a high speed on a work piece heated to 600 ° C., and a test piece 1 corresponding to a comparative mold in Table 2 and a book. It shows about the test piece 1 corresponding to the invention mold, and the test load is shown in the parentheses.
【図２】表２中の比較金型相当の試験片１の窒化層金属
組織写真とEPMAライン分析によるＣ分布を示す図であ
る。FIG. 2 is a diagram showing a photograph of a nitrided layer metallographic structure of a test piece 1 corresponding to a comparative mold in Table 2 and a C distribution by EPMA line analysis.
【図３】表２中の比較金型相当の試験片２の窒化層金属
組織写真とEPMAライン分析によるＣ分布を示す図であ
る。FIG. 3 is a view showing a photograph of a nitride layer metallographic structure of a test piece 2 corresponding to a comparative mold in Table 2 and a C distribution by EPMA line analysis.
【図４】表２中の比較金型相当の試験片３の窒化層金属
組織写真とEPMAライン分析によるＣ分布を示す図であ
る。FIG. 4 is a view showing a photograph of a nitrided layer metallographic structure of a test piece 3 corresponding to a comparative mold in Table 2 and a C distribution by EPMA line analysis.
【図５】表２中の本発明金型相当の試験片１の窒化層金
属組織写真とEPMAライン分析によるＣ分布を示す図であ
る。FIG. 5 is a view showing a photograph of a nitrided layer metallographic structure of a test piece 1 corresponding to the mold of the present invention in Table 2 and a C distribution by EPMA line analysis.
【図６】表２中の本発明金型相当の試験片２の窒化層金
属組織写真とEPMAライン分析によるＣ分布を示す図であ
る。FIG. 6 is a view showing a nitride layer metallographic structure photograph and a C distribution by EPMA line analysis of a test piece 2 corresponding to the mold of the present invention in Table 2.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２３Ｃ 8/36 7516−4Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location C23C 8/36 7516-4K
Claims (8)
以下、Ｍn 0.1〜1.5%、Ｃr 2.55〜6.50%、ＷとＭoの１
種または２種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ 0.2〜1.5
%、残部Ｆeおよび不可避的不純物からなり、少なくとも
金型作業面に化合物層と拡散層から成る窒化層を有し、
かつ前記の窒化層は、母材の炭素量以上の炭素濃度であ
ることを特徴とする耐摩耗性にすぐれる熱間加工用金
型。1. By weight%, C 0.30% to 0.55%, Si 1.20%
Below, Mn 0.1 to 1.5%, Cr 2.55 to 6.50%, W and Mo 1
1.0 to 4.5% at 1 / 2W + Mo, V 0.2 to 1.5
%, The balance Fe and unavoidable impurities, and has a nitride layer composed of a compound layer and a diffusion layer on at least the mold working surface,
In addition, the above-mentioned nitrided layer has a carbon concentration equal to or higher than the carbon amount of the base material, and a die for hot working having excellent wear resistance.
以下、Ｍn 0.1〜1.5%、Ｎi 0.1〜1.5%、Ｃr 2.55〜6.50
%、ＷとＭoの１種または２種を1/2Ｗ＋Ｍoで1.0〜4.5
%、Ｖ 0.2〜1.5%、残部Ｆeおよび不可避的不純物からな
り、少なくとも金型作業面に化合物層と拡散層から成る
窒化層を有し、かつ前記の窒化層は、母材の炭素量以上
の炭素濃度であることを特徴とする耐摩耗性にすぐれる
熱間加工用金型。2. C 0.30% to 0.55%, Si 1.20% by weight
Below, Mn 0.1 to 1.5%, Ni 0.1 to 1.5%, Cr 2.55 to 6.50
%, W and Mo 1 type or 2 types at 1/2 W + Mo 1.0 to 4.5
%, V 0.2 to 1.5%, the balance Fe and unavoidable impurities, and at least a nitride layer composed of a compound layer and a diffusion layer is formed on the working surface of the mold, and the nitride layer has a carbon content of not less than the base metal. A die for hot working with excellent wear resistance characterized by a carbon concentration.
以下、Ｍn 0.1〜1.5%、Ｃr 2.55〜6.50%、ＷとＭoの１
種または２種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ 0.2〜1.5
%、Ｃo 0.3〜5.0%、残部Ｆeおよび不可避的不純物から
なり、少なくとも金型作業面に化合物層と拡散層から成
る窒化層を有し、かつ前記の窒化層は、母材の炭素量以
上の炭素濃度であることを特徴とする耐摩耗性にすぐれ
る熱間加工用金型。3. By weight%, C 0.30% to 0.55%, Si 1.20%
Below, Mn 0.1 to 1.5%, Cr 2.55 to 6.50%, W and Mo 1
1.0 to 4.5% at 1 / 2W + Mo, V 0.2 to 1.5
%, Co 0.3 to 5.0%, the balance Fe and unavoidable impurities, and at least a nitride layer composed of a compound layer and a diffusion layer is formed on the working surface of the die, and the above-mentioned nitride layer has a carbon content of not less than the base metal. A die for hot working with excellent wear resistance characterized by a carbon concentration.
以下、Ｍn 0.1〜1.5%、Ｎi 0.1〜1.5%、Ｃr 2.55〜6.50
%、ＷとＭoの１種または２種を1/2Ｗ＋Ｍoで1.0〜4.5
%、Ｖ 0.2〜1.5%、Ｃo 0.3〜5.0%、残部Ｆeおよび不可
避的不純物からなり、少なくとも金型作業面に化合物層
と拡散層から成る窒化層を有し、かつ前記の窒化層は、
母材の炭素量以上の炭素濃度であることを特徴とする耐
摩耗性にすぐれる熱間加工用金型。4. In 0.3% by weight, C 0.30% to 0.55%, Si 1.20%
Below, Mn 0.1 to 1.5%, Ni 0.1 to 1.5%, Cr 2.55 to 6.50
%, W and Mo 1 type or 2 types at 1/2 W + Mo 1.0 to 4.5
%, V 0.2 to 1.5%, Co 0.3 to 5.0%, the balance Fe and unavoidable impurities, and a nitride layer composed of a compound layer and a diffusion layer on at least the mold working surface, and the nitride layer is
A die for hot working having excellent wear resistance, which has a carbon concentration higher than that of the base metal.
以下、Ｍn 0.1〜1.5%、Ｃr 2.55〜6.50%、ＷとＭoの１
種または２種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ 0.2〜1.5
%、Ｎb、Ｔa、Ｔi、の１種または２種以上を合計で0.03
〜0.40％、残部Ｆeおよび不可避的不純物からなり、少
なくとも金型作業面に化合物層と拡散層から成る窒化層
を有し、かつ前記の窒化層は、母材の炭素量以上の炭素
濃度であることを特徴とする耐摩耗性にすぐれる熱間加
工用金型。5. By weight%, C 0.30% to 0.55%, Si 1.20%
Below, Mn 0.1 to 1.5%, Cr 2.55 to 6.50%, W and Mo 1
1.0 to 4.5% at 1 / 2W + Mo, V 0.2 to 1.5
%, Nb, Ta, Ti, 1 type or 2 or more types in total 0.03
.About.0.40%, balance Fe and unavoidable impurities, and at least a nitride layer composed of a compound layer and a diffusion layer on the work surface of the die, and the nitride layer has a carbon concentration equal to or higher than the carbon amount of the base material. A hot working mold with excellent wear resistance.
以下、Ｍn 0.1〜1.5%、Ｎi 0.1〜1.5%、Ｃr 2.55〜6.50
%、ＷとＭoの１種または２種を1/2Ｗ＋Ｍoで1.0〜4.5
%、Ｖ 0.2〜1.5%、Ｎb、Ｔa、Ｔi、の１種または２種以
上を合計で0.03〜0.40％、残部Ｆeおよび不可避的不純
物からなり、少なくとも金型作業面に化合物層と拡散層
から成る窒化層を有し、かつ前記の窒化層は、母材の炭
素量以上の炭素濃度であることを特徴とする耐摩耗性に
すぐれる熱間加工用金型。6. By weight%, C 0.30% to 0.55%, Si 1.20%
Below, Mn 0.1 to 1.5%, Ni 0.1 to 1.5%, Cr 2.55 to 6.50
%, W and Mo 1 type or 2 types at 1/2 W + Mo 1.0 to 4.5
%, V 0.2 to 1.5%, one or more of Nb, Ta and Ti, 0.03 to 0.40% in total, the balance Fe and unavoidable impurities, and at least a compound layer and a diffusion layer on the work surface of the mold. A die for hot working having excellent wear resistance, characterized in that it has a nitriding layer consisting of the nitriding layer, and the nitriding layer has a carbon concentration higher than that of the base material.
以下、Ｍn 0.1〜1.5%、Ｃr 2.55〜6.50%、ＷとＭoの１
種または２種を1/2Ｗ＋Ｍoで1.0〜4.5%、Ｖ 0.2〜1.5
%、Ｃo 0.3〜5.0%、Ｎb、Ｔa、Ｔi、の１種または２種
以上を合計で0.03〜0.40％、残部Ｆeおよび不可避的不
純物からなり、少なくとも金型作業面に化合物層と拡散
層から成る窒化層を有し、かつ前記の窒化層は、母材の
炭素量以上の炭素濃度であることを特徴とする耐摩耗性
にすぐれる熱間加工用金型。7. By weight%, C 0.30% to 0.55%, Si 1.20%
Below, Mn 0.1 to 1.5%, Cr 2.55 to 6.50%, W and Mo 1
1.0 to 4.5% at 1 / 2W + Mo, V 0.2 to 1.5
%, Co 0.3 to 5.0%, one or more of Nb, Ta, and Ti, 0.03 to 0.40% in total, the balance Fe and unavoidable impurities, at least from the compound layer and the diffusion layer on the work surface of the mold. A die for hot working having excellent wear resistance, characterized in that it has a nitriding layer consisting of the nitriding layer, and the nitriding layer has a carbon concentration higher than that of the base material.
以下、Ｍn 0.1〜1.5%、Ｎi 0.1〜1.5%、Ｃr 2.55〜6.50
%、ＷとＭoの１種または２種を1/2Ｗ＋Ｍoで1.0〜4.5
%、Ｖ 0.2〜1.5%、Ｃo 0.3〜5.0%、Ｎb、Ｔa、Ｔi、の
１種または２種以上を合計で0.03〜0.40％、残部Ｆeお
よび不可避的不純物からなり、少なくとも金型作業面に
化合物層と拡散層から成る窒化層を有し、かつ前記の窒
化層は、母材の炭素量以上の炭素濃度であることを特徴
とする耐摩耗性にすぐれる熱間加工用金型。8. By weight%, C 0.30% to 0.55%, Si 1.20%
Below, Mn 0.1 to 1.5%, Ni 0.1 to 1.5%, Cr 2.55 to 6.50
%, W and Mo 1 type or 2 types at 1/2 W + Mo 1.0 to 4.5
%, V 0.2 to 1.5%, Co 0.3 to 5.0%, one or more of Nb, Ta and Ti, 0.03 to 0.40% in total, the balance Fe and unavoidable impurities, and at least on the mold working surface. A hot working die having excellent wear resistance, comprising a nitride layer composed of a compound layer and a diffusion layer, and the nitride layer has a carbon concentration higher than that of the base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35206192A JPH06172943A (en) | 1992-12-09 | 1992-12-09 | Die for hot working excellent in wear resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35206192A JPH06172943A (en) | 1992-12-09 | 1992-12-09 | Die for hot working excellent in wear resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06172943A true JPH06172943A (en) | 1994-06-21 |
Family
ID=18421523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35206192A Pending JPH06172943A (en) | 1992-12-09 | 1992-12-09 | Die for hot working excellent in wear resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06172943A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10121195A (en) * | 1996-10-16 | 1998-05-12 | Sanyo Special Steel Co Ltd | Hot tool steel excellent in nitriding characteristics |
| US5944920A (en) * | 1996-04-10 | 1999-08-31 | Hitachi Metals, Ltd. | Piston ring material excellent in workability |
| JP2006028541A (en) * | 2004-07-12 | 2006-02-02 | Nissan Motor Co Ltd | Method for manufacturing components for high-strength mechanical structure and components for high-strength mechanical structure |
| JP2006322036A (en) * | 2005-05-18 | 2006-11-30 | Kobe Steel Ltd | Vacuum-carburized parts and manufacturing method therefor |
| JP2007056368A (en) * | 2005-07-29 | 2007-03-08 | Showa Denko Kk | Surface treatment method for aluminum extruding die, and aluminum extruding die |
| EP3394309A4 (en) * | 2015-12-22 | 2019-01-02 | Uddeholms AB | Hot work tool steel |
| CN109913768A (en) * | 2019-04-30 | 2019-06-21 | 浙江自贸区北重金属科技有限公司 | A kind of electroslag remelting hot die steel and preparation method thereof |
-
1992
- 1992-12-09 JP JP35206192A patent/JPH06172943A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5944920A (en) * | 1996-04-10 | 1999-08-31 | Hitachi Metals, Ltd. | Piston ring material excellent in workability |
| JPH10121195A (en) * | 1996-10-16 | 1998-05-12 | Sanyo Special Steel Co Ltd | Hot tool steel excellent in nitriding characteristics |
| JP2006028541A (en) * | 2004-07-12 | 2006-02-02 | Nissan Motor Co Ltd | Method for manufacturing components for high-strength mechanical structure and components for high-strength mechanical structure |
| JP4655528B2 (en) * | 2004-07-12 | 2011-03-23 | 日産自動車株式会社 | Manufacturing method of high-strength machine structure parts and high-strength machine structure parts |
| JP2006322036A (en) * | 2005-05-18 | 2006-11-30 | Kobe Steel Ltd | Vacuum-carburized parts and manufacturing method therefor |
| JP2007056368A (en) * | 2005-07-29 | 2007-03-08 | Showa Denko Kk | Surface treatment method for aluminum extruding die, and aluminum extruding die |
| EP3394309A4 (en) * | 2015-12-22 | 2019-01-02 | Uddeholms AB | Hot work tool steel |
| US11131012B2 (en) | 2015-12-22 | 2021-09-28 | Uddeholms Ab | Hot work tool steel |
| CN109913768A (en) * | 2019-04-30 | 2019-06-21 | 浙江自贸区北重金属科技有限公司 | A kind of electroslag remelting hot die steel and preparation method thereof |
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