JP3220322B2 - Maraging steel with excellent heat check resistance - Google Patents
Maraging steel with excellent heat check resistanceInfo
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- JP3220322B2 JP3220322B2 JP05492394A JP5492394A JP3220322B2 JP 3220322 B2 JP3220322 B2 JP 3220322B2 JP 05492394 A JP05492394 A JP 05492394A JP 5492394 A JP5492394 A JP 5492394A JP 3220322 B2 JP3220322 B2 JP 3220322B2
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- Prior art keywords
- maraging steel
- steel
- heat check
- present
- check resistance
- Prior art date
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Description
【０００１】[0001]
【産業上の利用分野】この発明はダイカスト金型に好適
に使用できる耐ヒートチェック性に優れたマルエージン
グ鋼に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a maraging steel having excellent heat check resistance which can be suitably used for a die casting mold.
【０００２】[0002]
【従来の技術】従来、ダイカスト金型用鋼材として主に
５％Ｃｒ，１〜１．５％Ｍｏを含む熱間工具用鋼が用い
られていた。この熱間工具用鋼にてダイカスト金型を製
造する場合、その過程で焼入れ・焼戻し処理を行い、以
て所要の硬さ，強度を発現させる。2. Description of the Related Art Conventionally, as a steel material for a die-casting die, a steel for a hot tool mainly containing 5% Cr and 1 to 1.5% Mo has been used. When a die casting mold is manufactured from the steel for a hot tool, quenching and tempering are performed in the process to develop required hardness and strength.
【０００３】しかしながらその焼入れ処理は１０００℃
を超える高温処理であるため、また焼入れに際してマル
テンサイト変態を伴うため、焼入れ・焼戻しによって大
きな熱処理歪，変形が生ずる。[0003] However, the quenching process is performed at 1000 ° C.
Quenching and tempering causes large heat treatment distortion and deformation.
【０００４】このためかかる熱間工具用鋼にてダイカス
ト金型を製造する場合、焼入れ・焼戻し処理の前に一旦
粗加工を行い、そして焼入れ・焼戻し処理後に再び仕上
げのための加工が必要であって２度の加工を必要とし、
そのため加工工数が多くなって金型製造のための所要時
間が長く、このことが大きな問題となっていた。[0004] For this reason, when a die casting die is manufactured from such steel for a hot tool, it is necessary to perform roughing once before quenching and tempering, and to finish again after quenching and tempering. Need to process twice,
Therefore, the number of processing steps is increased and the time required for manufacturing the mold is long, which has been a major problem.
【０００５】一方金型用材料として主に航空機材料等と
して用いられている高強度の且つ加工性に優れたマルエ
ージング鋼の適用も研究されている。On the other hand, application of a maraging steel having high strength and excellent workability, which is mainly used as an aircraft material or the like as a mold material, has been studied.
【０００６】マルエージング鋼は、極低Ｃの高Ｎｉ且つ
Ｃｏ，Ｍｏ等種々の元素を加えた鋼をマルテンサイト組
織としてこれに時効処理を施し、金属間化合物を析出さ
せることによって硬化させるもので、その際の時効処理
温度は５００℃前後と低く、また時効処理に際して変態
を伴わないので熱処理による歪が少なく、従って１回の
加工で金型を製造することが可能で、加工時間を低減で
きる利点を有する。[0006] The maraging steel is a steel obtained by adding a high Ni of extremely low C and various elements such as Co and Mo to a martensite structure, aging the steel, and hardening the steel by precipitating an intermetallic compound. In this case, the aging temperature is as low as about 500 ° C., and since there is no transformation during the aging treatment, distortion due to heat treatment is small, so that a mold can be manufactured by one processing, and the processing time can be reduced. Has advantages.
【０００７】[0007]
【発明が解決しようとする課題】従来、かかる金型用と
して用いられているマルエージング鋼はＮｉを少なくと
も１２％以上含有するもので、このものは耐ヒートチェ
ック性、即ち金型表面の急速加熱冷却に伴う熱応力の繰
返しによって表面に発生するクラックに対する耐性が十
分でなく、このため金型として用いたときその寿命が従
来の熱間工具用鋼から成る金型に対して著しく短い問題
があった。Conventionally, the maraging steel used for such a mold contains at least 12% or more of Ni, which has heat check resistance, that is, rapid heating of the mold surface. The resistance to cracks generated on the surface due to the repetition of thermal stress caused by cooling is not sufficient, so that when used as a mold, its life is significantly shorter than that of a conventional mold made of hot work steel. Was.
【０００８】[0008]
【課題を解決するための手段】本願の発明はこのような
問題を解決することを目的としてなされたものである。
而して請求項１の発明は、マルエージング鋼を重量基準
で Ｃ：≦０．０３％ Ｓｉ：≦０．１０％ Ｍｎ：≦０．１０％ Ｐ：≦０．０１０％ Ｓ：≦０．０１０％ Ｎｉ：６．０〜１１．０
％ Ｃｒ：≦０．３０％ Ｍｏ：４．０〜９．０
％ Ｃｏ：７．０〜１１．０％ Ｔｉ：０．１０〜１．
０％ Ａｌ：０．０５〜０．１５％ Ｂ：≦０．０１０％ Ｚｒ：≦０．１０％ Ｃａ：≦０．１０％ 残部実質的にＦｅから成る組織とすることを特徴とす
る。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem.
Thus, the invention of claim 1 is based on the weight of the maraging steel. C: ≦ 0.03% Si: ≦ 0.10% Mn: ≦ 0.10% P: ≦ 0.010% S: ≦ 0. 010% Ni: 6.0 to 11.0
% Cr: ≦ 0.30% Mo: 4.0-9.0
% Co: 7.0-11.0% Ti: 0.10-1.
0% Al: 0.05 to 0.15% B: ≤ 0.010% Zr: ≤ 0.10% Ca: ≤ 0.10% The balance is substantially composed of Fe.
【０００９】本発明は、従来のマルエージング鋼に比べ
てＮｉ含量を６．０〜１１．０％と低くした上、Ｍｏ量
の適正化及びＮｉ，Ｃｏ，Ｍｏ量のバランスの適正化を
図ったことを骨子とする。According to the present invention, the Ni content is reduced to 6.0 to 11.0% as compared with the conventional maraging steel, and the Mo content and the balance of Ni, Co and Mo are optimized. The thing is the main point.
【００１０】本発明者等は、マルエージング鋼における
耐ヒートチェック性が低いことの理由を追求する中で、
その主原因がＮｉの高添加によるＡｓ点、即ちマルテン
サイトからオーステナイトに変態する変態開始温度が低
いことが主原因であるとの結論を得た。The present inventors have pursued the reason that the maraging steel has low heat check resistance,
It was concluded that the main cause was that the As point due to the high addition of Ni, that is, the low transformation start temperature at which the transformation from martensite to austenite was low.
【００１１】例えばダイカスト金型の場合、金型表面温
度は６５０℃程度の高い温度まで上昇する。しかるにＮ
ｉ含量が１２％以上のマルエージング鋼の場合、Ａｓ点
はこの金型表面の到達温度よりも低く、従って金型の表
面部分は一部がオーステナイト化してそこにマルテンサ
イト相とオーステナイト相との両相が混在した状態が発
現する。For example, in the case of a die casting mold, the surface temperature of the mold rises to a high temperature of about 650 ° C. But N
In the case of a maraging steel having an i content of 12% or more, the As point is lower than the ultimate temperature of the mold surface, and therefore, the surface portion of the mold is partially austenitized, and the martensite phase and the austenite phase are formed there. A state where both phases are mixed appears.
【００１２】而してオーステナイトとマルテンサイトと
は熱膨張率に差があり（オーステナイトの方がマルテン
サイトに比べて熱膨張率が大きい）、このため加熱冷却
に伴う金型表層部の膨張収縮の繰返しによって両相の界
面にクラックが発生及び成長し、このことが耐ヒートチ
ェック性を低下させる主原因になっているとの結論を得
た。Austenite and martensite have a difference in the coefficient of thermal expansion (austenite has a larger coefficient of thermal expansion than martensite). Therefore, the expansion and contraction of the mold surface layer due to heating and cooling is reduced. It was concluded that cracks occurred and grew at the interface between the two phases due to repetition, and that this was the main cause of reducing the heat check resistance.
【００１３】そこで本発明では、従来のマルエージング
鋼に対してＮｉ含量を６．０〜１１．０％と低めとし、
これに応じてＭｏ量の適正化，Ｎｉ，Ｃｏ，Ｍｏ量のバ
ランスの適正化を行って時効硬さを向上させたところ、
ダイカスト金型として用いた場合に良好な耐ヒートチェ
ック性を有する、従って金型寿命も十分なマルエージン
グ鋼が得られることを確認した。Therefore, in the present invention, the Ni content is set to be as low as 6.0 to 11.0% with respect to the conventional maraging steel,
In response to this, the amount of Mo was optimized and the balance of the amounts of Ni, Co, and Mo was adjusted to improve the aging hardness.
It was confirmed that when used as a die-casting die, a maraging steel having good heat check resistance and therefore having a sufficient die life was obtained.
【００１４】次に本発明における各成分の限定理由を詳
述する。 Ｃ：≦０．０３％ Ｃは０．０３％を超えると鋼の靱性を劣化させ、また時
効処理の際の時効硬化性を阻害するため上限を０．０３
％とした。Next, the reasons for limiting each component in the present invention will be described in detail. C: ≦ 0.03% If C exceeds 0.03%, the toughness of the steel is degraded, and the age hardening during aging treatment is impaired.
%.
【００１５】Ｓｉ：≦０．１０％ Ｓｉは０．１０％を超えると鋼の靱性を劣化させるため
上限を０．１０％とした。Si: ≦ 0.10% Since Si degrades the toughness of steel when it exceeds 0.10%, the upper limit is made 0.10%.
【００１６】Ｍｎ：≦０．１０％ Ｍｎは０．１０％を超えると鋼の靱性を劣化させるため
上限を０．１０％とした。Mn: ≦ 0.10% If Mn exceeds 0.10%, the toughness of the steel deteriorates, so the upper limit was made 0.10%.
【００１７】Ｐ：≦０．０１０％ Ｐは０．０１０％を超えると衝撃抵抗性を低下させるた
め上限を０．０１０％とした。P: ≦ 0.010% If P exceeds 0.010%, the impact resistance is reduced, so the upper limit is made 0.010%.
【００１８】Ｓ：≦０．０１０％ Ｓは０．０１０％を超えると熱間加工性が劣化するため
上限を０．０１０％とした。S: ≦ 0.010% If S exceeds 0.010%, the hot workability deteriorates, so the upper limit was made 0.010%.
【００１９】Ｎｉ：６．０〜１１．０％ Ｎｉは含有量が６．０％未満であると時効硬化性が不足
する。一方１１．０％を超えるとＡｓ点が低下し、この
結果耐ヒートチェック性が低下する。またコストも高く
なる。従って本発明ではＮｉの下限を６．０％、上限を
１１．０％とした。Ni: 6.0 to 11.0% If the Ni content is less than 6.0%, age hardening is insufficient. On the other hand, if it exceeds 11.0%, the As point decreases, and as a result, the heat check resistance decreases. Also, the cost is increased. Therefore, in the present invention, the lower limit of Ni is set to 6.0%, and the upper limit is set to 11.0%.
【００２０】Ｃｒ：≦０．３０％ Ｃｒは０．３０％を超えると不純物として靱性を劣化さ
せる。従って上限を０．３０％とした。Cr: ≦ 0.30% If Cr exceeds 0.30%, toughness is deteriorated as an impurity. Therefore, the upper limit is set to 0.30%.
【００２１】Ｍｏ：４．０〜９．０％ Ｍｏは４．０％未満では時効硬化性が不足する一方、
９．０％を超えるとＭｓ点が低下し、またコストも高く
なる。従って本発明では下限，上限をそれぞれ４．０
％，９．０％とした。Mo: 4.0-9.0% When Mo is less than 4.0%, age hardening is insufficient, while Mo is less than 4.0%.
If it exceeds 9.0%, the Ms point decreases and the cost increases. Therefore, in the present invention, the lower limit and the upper limit are each 4.0.
%, 9.0%.
【００２２】Ｃｏ：７．０〜１１．０％ Ｃｏは７．０％未満であるとＭｏとの複合効果での時効
硬化性が不足する。またＡｓ点も低下する。他方１１．
０％を超えると靱性が劣化し、またコストも高くなる。
従って本発明では７．０〜１１．０％とした。Co: 7.0 to 11.0% If Co is less than 7.0%, age hardening due to the combined effect with Mo is insufficient. Also, the As point decreases. 11.
If it exceeds 0%, the toughness deteriorates and the cost increases.
Therefore, in the present invention, it is set to 7.0 to 11.0%.
【００２３】Ｔｉ：０．１０〜１．０％ Ｔｉは０．１０％未満の場合には時効硬化性が不足し、
また結晶粒が粗大化する。一方１．０％超えると介在物
量が増加し、靱性が劣化する。従って本発明では０．１
０〜１．０％とした。Ti: 0.10 to 1.0% When Ti is less than 0.10%, age hardening is insufficient,
Also, the crystal grains become coarse. On the other hand, if it exceeds 1.0%, the amount of inclusions increases and the toughness deteriorates. Therefore, in the present invention, 0.1
0% to 1.0%.
【００２４】Ａｌ：０．０５〜０．１５％ Ａｌは０．０５％未満では時効硬化性が不足する。一方
０．１５％を超えると靱性が劣化し、またフェライトが
生成する。従ってここでは０．０５〜０．１５％とし
た。Al: 0.05 to 0.15% If the Al content is less than 0.05%, age hardening properties are insufficient. On the other hand, if it exceeds 0.15%, toughness is deteriorated and ferrite is generated. Therefore, it is set to 0.05 to 0.15% here.
【００２５】Ｂ：≦０．０１０％ Ｂは強度低下の要因となる結晶粒界での偏析を防止する
作用がある。但しその効果は０．０１０％で飽和するた
め、上限を０．０１０％とした。B: ≦ 0.010% B has the effect of preventing segregation at the crystal grain boundaries, which causes a reduction in strength. However, since the effect is saturated at 0.010%, the upper limit is set to 0.010%.
【００２６】Ｚｒ：≦０．１０％ ＺｒはＣ，Ｎを固定し、材料の靱性を向上させ、結晶粒
の粗大化を防止する。但しその効果は０．１０％で飽和
するため上限を０．１０％とした。Zr: ≦ 0.10% Zr fixes C and N, improves the toughness of the material, and prevents the crystal grains from becoming coarse. However, since the effect is saturated at 0.10%, the upper limit is set to 0.10%.
【００２７】Ｃａ：≦０．１０％ Ｃａは被削性を向上させるが０．１０％を超えると非金
属介在物量が増加する。従って上限を０．１０％とし
た。Ca: ≦ 0.10% Ca improves machinability, but if it exceeds 0.10%, the amount of nonmetallic inclusions increases. Therefore, the upper limit is set to 0.10%.
【００２８】次に、請求項２の発明はマルエージング鋼
を重量基準で Ｃ：≦０．０３％ Ｓｉ：≦０．１０％ Ｍｎ：≦０．１０％ Ｐ：≦０．０１０％ Ｓ：≦０．０１０％ Ｎｉ：６．０〜１１．０
％ Ｃｒ：８．１〜９．０％ Ｍｏ：４．０〜９．０
％ Ｃｏ：７．０〜１１．０％ Ｔｉ：０．１０〜１．
０％ Ａｌ：０．０５〜０．１５％ Ｂ：≦０．０１０％ Ｚｒ：≦０．１０％ Ｃａ：≦０．１０％ 残部実質的にＦｅから成る組成とすることを特徴とす
る。Next, according to the invention of claim 2, the maraging steel is based on the weight: C: ≦ 0.03% Si: ≦ 0.10% Mn: ≦ 0.10% P: ≦ 0.010% S: ≦ 0.010% Ni: 6.0 to 11.0
% Cr: 8.1 to 9.0% Mo: 4.0 to 9.0
% Co: 7.0-11.0% Ti: 0.10-1.
0% Al: 0.05 to 0.15% B: ≤ 0.010% Zr: ≤ 0.10% Ca: ≤ 0.10% The balance is substantially composed of Fe.
【００２９】この発明は、請求項１の発明のマルエージ
ング鋼においてＣｒを８．１〜９．０％の範囲で含有さ
せるようにしたものである。このようにＣｒを８．１〜
９．０％の範囲で含有させた場合、マルエージング鋼の
耐酸化性が効果的に向上し、この結果耐ヒートチェック
性が向上する。従ってこのマルエージング鋼にてダイカ
スト金型を構成した場合、金型寿命が向上する。According to the present invention, the maraging steel according to the first aspect of the present invention contains Cr in a range of 8.1 to 9.0%. As described above, when the Cr is set to 8.1 to
When contained in the range of 9.0%, the oxidation resistance of the maraging steel is effectively improved, and as a result, the heat check resistance is improved. Therefore, when a die-casting die is made of this maraging steel, the life of the die is improved.
【００３０】尚、本発明においてＣｒの含有量を８．１
〜９．０％としているのは、８．１％未満では耐酸化性
を充分に向上させることができず、また逆に９．０％を
超えるとフェライト相が生成し、耐ヒートチェック性が
劣化する。そこで８．１〜９．０％に含有量を規定した
ものである。In the present invention, the content of Cr is set to 8.1.
The reason for setting it to 9.0% is that if it is less than 8.1%, the oxidation resistance cannot be sufficiently improved, and if it exceeds 9.0%, a ferrite phase is formed, and the heat check resistance becomes poor. to degrade. Therefore, the content is regulated to 8.1 to 9.0%.
【００３１】次に、請求項３の発明はマルエージング鋼
を重量基準で Ｃ：≦０．０３％ Ｓｉ：≦０．１０％ Ｍｎ：≦０．１０％ Ｐ：≦０．０１０％ Ｓ：≦０．０１０％ Ｎｉ：９．０〜１１．０
％ Ｃｒ：≦０．３０％ Ｍｏ：４．０〜９．０
％ Ｃｏ：９．０〜１１．０％ Ｔｉ：０．１０〜１．
０％ Ａｌ：０．０５〜０．１５％ Ｂ：≦０．０１０％ Ｚｒ：≦０．１０％ Ｃａ：≦０．１０％ 残部実質的にＦｅから成る組成とすることを特徴とす
る。Next, the invention of claim 3 is based on the weight of the maraging steel: C: ≦ 0.03% Si: ≦ 0.10% Mn: ≦ 0.10% P: ≦ 0.010% S: ≦ 0.010% Ni: 9.0 to 11.0
% Cr: ≦ 0.30% Mo: 4.0-9.0
% Co: 9.0-11.0% Ti: 0.10-1.
0% Al: 0.05 to 0.15% B: ≤ 0.010% Zr: ≤ 0.10% Ca: ≤ 0.10% The balance is substantially composed of Fe.
【００３２】この発明は、請求項１の発明のマルエージ
ング鋼においてＮｉ含量及びＣｏ含量をそれぞれ９．０
〜１１．０％，９．０〜１１．０％と高めに規定したも
ので、このようにすることによりマルエージング鋼の特
性を更に良好とすることができる。According to the present invention, in the maraging steel according to the first aspect of the present invention, the Ni content and the Co content are each adjusted to 9.0.
１11.0%, 9.0 to 11.0%, which are set to be relatively high. By doing so, the characteristics of the maraging steel can be further improved.
【００３３】本発明において、Ｎｉを９．０〜１１．０
％，Ｃｏを９．０〜１１．０％にそれぞれ規定している
理由は、Ｎｉが９．０％未満のときには充分望ましい時
効硬化性が得られ難く、またＣｏが９．０％未満のとき
にはＭｏとの複合作用の下において充分望ましい時効硬
化性が得られ難いことによる。尚、上限値の限定理由は
請求項１におけるのと同様である。In the present invention, Ni is added in the range of 9.0 to 11.0.
% And Co are regulated to 9.0 to 11.0%, respectively, because it is difficult to obtain a sufficiently desirable age hardening property when Ni is less than 9.0%, and when Co is less than 9.0%. This is because it is difficult to obtain a sufficiently desired age hardening property under the combined action with Mo. The reason for limiting the upper limit is the same as in the first aspect.
【００３４】次に、請求項４の発明はマルエージング鋼
を重量基準で Ｃ：≦０．０３％ Ｓｉ：≦０．１０％ Ｍｎ：≦０．１０％ Ｐ：≦０．０１０％ Ｓ：≦０．０１０％ Ｎｉ：６．０〜８．０％ Ｃｒ：８．１〜９．０％ Ｍｏ：７．０〜９．０
％ Ｃｏ：７．０〜９．０％ Ｔｉ：０．１０〜１．
０％ Ａｌ：０．０５〜０．１５％ Ｂ：≦０．０１０％ Ｚｒ：≦０．１０％ Ｃａ：≦０．１０％ 残部実質的にＦｅから成る組成とすることを特徴とす
る。Next, according to the invention of claim 4, the maraging steel is based on the weight: C: ≦ 0.03% Si: ≦ 0.10% Mn: ≦ 0.10% P: ≦ 0.010% S: ≦ 0.010% Ni: 6.0 to 8.0% Cr: 8.1 to 9.0% Mo: 7.0 to 9.0
% Co: 7.0-9.0% Ti: 0.10-1.
0% Al: 0.05 to 0.15% B: ≤ 0.010% Zr: ≤ 0.10% Ca: ≤ 0.10% The balance is substantially composed of Fe.
【００３５】この発明は、請求項２の発明のマルエージ
ング鋼においてＮｉ：６．０〜８．０％，Ｃｒ：８．１
〜９．０％，Ｍｏ：７．０〜９．０％，Ｃｏ：７．０〜
９．０％に規定したものである。即ちＮｉ，Ｃｒ，Ｍ
ｏ，Ｃｏの含有量としてはここに規定する含有量が望ま
しいのであり、Ｎｉ，Ｃｒ，Ｍｏ，Ｃｏをこの範囲内で
含有させることによってマルエージング鋼の特性を更に
良好とすることができる。According to the present invention, in the maraging steel according to the second aspect of the invention, Ni: 6.0-8.0%, Cr: 8.1.
-9.0%, Mo: 7.0-9.0%, Co: 7.0-
It is specified at 9.0%. That is, Ni, Cr, M
The contents specified here are desirable as the contents of o and Co, and the characteristics of the maraging steel can be further improved by including Ni, Cr, Mo, and Co in this range.
【００３６】具体的には、請求項２の発明においてＣｒ
を８．１〜９．０％含有させると耐酸化性は向上するの
であるが、Ｃｒの高添加によってマルエージング鋼のＡ
ｓ点が低下傾向となる。そこで本発明ではＣｒを高添加
すると同時にＮｉの含有量を低めに規定してＣｒ添加に
基くＡｓ点の低下を防ぎ、また併せてＭｏ，Ｃｏの含有
量を適正に設定して良好な時効硬化性を得るようにして
いる。Specifically, according to the second aspect of the present invention,
When the content of Cr is 8.1 to 9.0%, the oxidation resistance is improved.
The s point tends to decrease. Therefore, in the present invention, the content of Ni is specified to be low at the same time as the high addition of Cr to prevent the decrease of the As point due to the addition of Cr, and at the same time, the content of Mo and Co is appropriately set to provide good age hardening. I am trying to gain sex.
【００３７】従ってかかる請求項４の発明におけるＮ
ｉ，Ｃｒ，Ｍｏ，Ｃｏの添加量の限定理由は以下の通り
である。 Ｎｉ：６．０〜８．０％ 下限を６．０％としたのは前述したのと同様の理由から
であり、また上限を８．０％としたのはＣｒの添加によ
りＡｓ点が下がるのをＮｉ含量の低め設定によって防ぐ
主旨である。Therefore, in the invention of claim 4, N
The reasons for limiting the amounts of i, Cr, Mo, and Co added are as follows. Ni: 6.0-8.0% The lower limit was set to 6.0% for the same reason as described above, and the upper limit was set to 8.0% because the addition of Cr lowers the As point. Is prevented by setting the Ni content lower.
【００３８】Ｃｒ：８．１〜９．０％ Ｃｒを８．１〜９．０％にしているのは請求項２で述べ
たのと同様の理由からである。Cr: 8.1 to 9.0% Cr is set to 8.1 to 9.0% for the same reason as described in claim 2.
【００３９】Ｍｏ：７．０〜９．０％ Ｃｏ：７．０〜９．０％ 上記Ｎｉ，Ｃｒの添加に応じてＭｏ，Ｃｏの量をバラン
スさせ、以て時効硬さを向上させる主旨である。Mo: 7.0 to 9.0% Co: 7.0 to 9.0% The purpose of improving the aging hardness is to balance the amounts of Mo and Co in accordance with the addition of Ni and Cr. It is.
【００４０】[0040]
【実施例】次に本発明の実施例を以下に詳述する。表１
に示す化学成分のマルエージング鋼にてダイカスト金型
を製造し、このダイカスト金型を用いて鋳造実験を繰り
返し行い、耐酸化性，耐ヒートチェック性及び金型の寿
命を調べた。また併せてＡｓ点，Ｍｓ点も求めた。結果
が表２に併せて示してある。ここで耐ヒートチェック性
の評価は高周波加熱式ヒートチェック試験にて行い、そ
の際１５ｍｍφ，肉厚５ｍｍの試験片に対する６５０℃
×４秒の加熱及び水冷３秒の冷却を１サイクルとしてこ
れを１０００回繰り返し行い、発生するクラックの数，
大きさを求めた。Next, embodiments of the present invention will be described in detail. Table 1
A die-casting die was manufactured from a maraging steel having the chemical composition shown in (1), and a casting experiment was repeated using the die-casting die to examine oxidation resistance, heat check resistance, and the life of the die. In addition, As point and Ms point were also determined. The results are also shown in Table 2. Here, the heat check resistance was evaluated by a high-frequency heating type heat check test.
This was repeated 1000 times with one cycle of heating for 4 seconds and cooling for 3 seconds in water cooling, and the number of cracks generated,
The size was determined.
【００４１】尚固溶化熱処理（ＳＴ）及び時効処理は表
２に示す温度条件の下で行った。その際の硬さも表中に
併せて示してある。また比較鋼１４（ＳＫＤ６１）の熱
間工具用鋼については、表に示す温度で焼入れ処理，焼
戻し処理をした場合の値で示してある（Ｈ：焼入れ，
Ｔ：焼戻し）。The solution heat treatment (ST) and the aging treatment were performed under the temperature conditions shown in Table 2. The hardness at that time is also shown in the table. The values of the steel for hot tool of Comparative Steel 14 (SKD61) are shown in the case where the quenching and tempering treatments are performed at the temperatures shown in the table (H: quenching,
T: tempering).
【００４２】[0042]
【表１】 [Table 1]
【００４３】[0043]
【表２】 [Table 2]
【００４４】この結果に見られるように、Ｎｉ含量を少
なくした上Ｍｏ量及びＮｉ，Ｃｏ，Ｍｏ量のバランスを
適正化した本発明例のマルエージング鋼の場合、或いは
Ｃｒを所定量含有させた本発明例のマルエージング鋼の
場合、耐ヒートチェック性，金型寿命が比較例のものに
比べて向上していることが分る。尚比較例１４は焼入れ
焼戻し型鋼のＳＫＤ６１であり、特性的には良好である
が、焼入れ歪が大きく加工工程の面で問題のあるもので
ある。As can be seen from the results, in the case of the maraging steel of the present invention in which the Ni content was reduced and the balance between the Mo content and the Ni, Co, Mo content was optimized, or a predetermined amount of Cr was contained. In the case of the maraging steel of the present invention, the heat check resistance and the mold life are improved as compared with those of the comparative example. Comparative Example 14 is SKD61, a quenched and tempered steel, which is good in characteristics, but has a large quenching distortion and has a problem in the processing step.
【００４５】[0045]
【発明の効果】以上詳述したように、請求項１の発明に
よれば耐ヒートチェック性に優れたマルエージング鋼が
得られる。このマルエージング鋼はダイカスト金型に充
分に適用可能なものである。而してかかるマルエージン
グ鋼を用いてダイカスト金型を構成した場合、金型製造
に要する工程，時間，コストを低減することができる。As described in detail above, according to the first aspect of the present invention, a maraging steel having excellent heat check resistance can be obtained. This maraging steel is sufficiently applicable to die casting dies. Thus, when a die casting mold is formed using such maraging steel, the steps, time, and cost required for manufacturing the mold can be reduced.
【００４６】また請求項２の発明によれば、マルエージ
ング鋼の耐酸化性が向上し、この結果耐ヒートチェック
性が向上する。従ってこの発明のマルエージング鋼を用
いてダイカスト金型を構成した場合、金型の寿命が向上
する効果が得られる。According to the second aspect of the present invention, the oxidation resistance of the maraging steel is improved, and as a result, the heat check resistance is improved. Therefore, when a die-casting die is formed by using the maraging steel of the present invention, the effect of improving the life of the die is obtained.
【００４７】請求項３の発明によれば更に望ましい特性
のマルエージング鋼が得られる。また請求項４の発明に
よれば、Ｃｒの高添加による耐酸化性の向上とＮｉ含量
の低めの設定及びＭｏ，Ｃｏ含有量の適正化に基いてマ
ルエージング鋼の耐ヒートチェック性を更に良好とで
き、金型寿命を高寿命とすることができる。According to the third aspect of the invention, a maraging steel having more desirable characteristics can be obtained. According to the invention of claim 4, the heat check resistance of the maraging steel is further improved based on the improvement of the oxidation resistance due to the high addition of Cr, the lower setting of the Ni content, and the optimization of the Mo and Co contents. The mold life can be extended.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−134648（ＪＰ，Ａ) 特開 昭63−203751（ＪＰ，Ａ) 特開 昭62−174350（ＪＰ，Ａ) 特開 昭62−67152（ＪＰ，Ａ) 特開 昭52−150323（ＪＰ，Ａ) 特開 昭60−221555（ＪＰ，Ａ) 特開 昭51−18208（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 38/00 302 C22C 38/54 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-134648 (JP, A) JP-A-63-203751 (JP, A) JP-A-62-174350 (JP, A) JP-A-62-174350 67152 (JP, A) JP-A-52-150323 (JP, A) JP-A-60-221555 (JP, A) JP-A-51-18208 (JP, A) (58) Fields investigated (Int. 7 , DB name) C22C 38/00 302 C22C 38/54
Claims (4)
％ Ｃｒ：≦０．３０％ Ｍｏ：４．０〜９．０
％ Ｃｏ：７．０〜１１．０％ Ｔｉ：０．１０〜１．
０％ Ａｌ：０．０５〜０．１５％ Ｂ：≦０．０１０％ Ｚｒ：≦０．１０％ Ｃａ：≦０．１０％ 残部実質的にＦｅから成る耐ヒートチェック性に優れた
マルエージング鋼。1. C: ≦ 0.03% Si: ≦ 0.10% Mn: ≦ 0.10% P: ≦ 0.010% S: ≦ 0.010% Ni: 6.0-11 on a weight basis .0
% Cr: ≦ 0.30% Mo: 4.0-9.0
% Co: 7.0-11.0% Ti: 0.10-1.
0% Al: 0.05 to 0.15% B: ≤ 0.010% Zr: ≤ 0.10% Ca: ≤ 0.10% The remainder is substantially composed of Fe and is a maraging steel having excellent heat check resistance. .
％ Ｃｒ：８．１〜９．０％ Ｍｏ：４．０〜９．０
％ Ｃｏ：７．０〜１１．０％ Ｔｉ：０．１０〜１．
０％ Ａｌ：０．０５〜０．１５％ Ｂ：≦０．０１０％ Ｚｒ：≦０．１０％ Ｃａ：≦０．１０％ 残部実質的にＦｅから成る耐ヒートチェック性に優れた
マルエージング鋼。2. C: ≦ 0.03% Si: ≦ 0.10% Mn: ≦ 0.10% P: ≦ 0.010% S: ≦ 0.010% Ni: 6.0-11 on a weight basis .0
% Cr: 8.1 to 9.0% Mo: 4.0 to 9.0
% Co: 7.0-11.0% Ti: 0.10-1.
0% Al: 0.05 to 0.15% B: ≤ 0.010% Zr: ≤ 0.10% Ca: ≤ 0.10% The remainder is substantially composed of Fe and is a maraging steel having excellent heat check resistance. .
％ Ｃｒ：≦０．３０％ Ｍｏ：４．０〜９．０
％ Ｃｏ：９．０〜１１．０％ Ｔｉ：０．１０〜１．
０％ Ａｌ：０．０５〜０．１５％ Ｂ：≦０．０１０％ Ｚｒ：≦０．１０％ Ｃａ：≦０．１０％ 残部実質的にＦｅから成る耐ヒートチェック性に優れた
マルエージング鋼。3. On a weight basis: C: ≤ 0.03% Si: ≤ 0.10% Mn: ≤ 0.10% P: ≤ 0.010% S: ≤ 0.010% Ni: 9.0 to 11 .0
% Cr: ≦ 0.30% Mo: 4.0-9.0
% Co: 9.0-11.0% Ti: 0.10-1.
0% Al: 0.05 to 0.15% B: ≤ 0.010% Zr: ≤ 0.10% Ca: ≤ 0.10% The remainder is substantially composed of Fe and is a maraging steel having excellent heat check resistance. .
％ Ｃｏ：７．０〜９．０％ Ｔｉ：０．１０〜１．
０％ Ａｌ：０．０５〜０．１５％ Ｂ：≦０．０１０％ Ｚｒ：≦０．１０％ Ｃａ：≦０．１０％ 残部実質的にＦｅから成る耐ヒートチェック性に優れた
マルエージング鋼。4. On a weight basis: C: ≤ 0.03% Si: ≤ 0.10% Mn: ≤ 0.10% P: ≤ 0.010% S: ≤ 0.010% Ni: 6.0-8 0.0% Cr: 8.1 to 9.0% Mo: 7.0 to 9.0
% Co: 7.0-9.0% Ti: 0.10-1.
0% Al: 0.05 to 0.15% B: ≤ 0.010% Zr: ≤ 0.10% Ca: ≤ 0.10% The remainder is substantially composed of Fe and is a maraging steel having excellent heat check resistance. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05492394A JP3220322B2 (en) | 1994-02-28 | 1994-02-28 | Maraging steel with excellent heat check resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05492394A JP3220322B2 (en) | 1994-02-28 | 1994-02-28 | Maraging steel with excellent heat check resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07243003A JPH07243003A (en) | 1995-09-19 |
| JP3220322B2 true JP3220322B2 (en) | 2001-10-22 |
Family
ID=12984145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05492394A Expired - Fee Related JP3220322B2 (en) | 1994-02-28 | 1994-02-28 | Maraging steel with excellent heat check resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3220322B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2639190C2 (en) * | 2016-05-05 | 2017-12-20 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" (ФГУП "ВИАМ") | Method of producing high-strength maraging steel |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060196626A1 (en) * | 2005-03-07 | 2006-09-07 | Thixomat, Inc. | Semisolid metal injection molding machine components |
| JP6653113B2 (en) | 2013-08-23 | 2020-02-26 | 大同特殊鋼株式会社 | Maraging steel with excellent fatigue properties |
| JP6610984B2 (en) * | 2017-12-18 | 2019-11-27 | 日立金属株式会社 | Laminated shaped object and manufacturing method thereof |
| CN116288027B (en) * | 2022-11-29 | 2023-09-12 | 清华大学 | Low-density maraging steel and preparation method thereof |
-
1994
- 1994-02-28 JP JP05492394A patent/JP3220322B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2639190C2 (en) * | 2016-05-05 | 2017-12-20 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" (ФГУП "ВИАМ") | Method of producing high-strength maraging steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07243003A (en) | 1995-09-19 |
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