JP3482349B2 - Hot working tool materials - Google Patents
Hot working tool materialsInfo
- Publication number
- JP3482349B2 JP3482349B2 JP34814098A JP34814098A JP3482349B2 JP 3482349 B2 JP3482349 B2 JP 3482349B2 JP 34814098 A JP34814098 A JP 34814098A JP 34814098 A JP34814098 A JP 34814098A JP 3482349 B2 JP3482349 B2 JP 3482349B2
- Authority
- JP
- Japan
- Prior art keywords
- hot working
- wear resistance
- carbides
- working tool
- 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.)
- Expired - Fee Related
Links
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- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、耐摩耗性、耐熱亀
裂性に優れた熱間加工用工具材、代表的には熱間圧延用
ロール材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot working tool material having excellent wear resistance and heat crack resistance, typically a hot rolling roll material.
【０００２】[0002]
【従来の技術】最近の高負荷、高熱負荷操業に従い、熱
間加工用工具材としては、高温度における耐摩耗性、耐
熱亀裂性が強く要求される。これまで熱間加工用工具
材、例えば、熱延ロールとしては、主にアダマイト材が
使用されてきたが、最近では、Ｃｒを１５〜２０％程度
含有した高Ｃｒ鋳鉄材が開発され、その良好な耐摩耗性
により急速にその適用が拡大されている。さらに、高Ｃ
ｒ鋳鉄よりも耐摩耗性にすぐれるハイス材のロールも出
現しつつある。しかし、これらのロール材は非常に硬い
炭化物を晶出、析出させており、耐摩耗性は優れるもの
の耐熱亀裂性が劣る問題を有している。2. Description of the Related Art Due to the recent high load and high heat load operation, a tool material for hot working is strongly required to have wear resistance and heat crack resistance at high temperature. Up to now, an adamite material has been mainly used as a hot working tool material, for example, a hot rolling roll, but recently, a high Cr cast iron material containing about 15 to 20% of Cr has been developed, which is excellent. Its wear resistance is rapidly expanding its application. Furthermore, high C
Rolls of high-speed steel, which has better wear resistance than cast iron, are also emerging. However, these roll materials crystallize and precipitate extremely hard carbides, and thus have a problem that they are inferior in heat crack resistance although they are excellent in wear resistance.
【０００３】[0003]
【発明が解決しようとする課題】一般に、耐摩耗性を改
善するには、組織中に硬い炭化物を多量に晶析出させる
ことが望ましい。しかし、遠心鋳造法等をはじめとする
溶湯から直接製造する場合は凝固速度が遅いこともあ
り、炭化物の粗大化や偏析を伴い易い。これら、高硬度
炭化物及びその粗大化により、耐熱亀裂性が阻害され
る。本発明は、このような点に鑑みなされたもので、耐
摩耗性に優れるとともに耐熱亀裂性を改善した熱間加工
用工具材を提供することを目的とする。Generally, in order to improve wear resistance, it is desirable to crystallize a large amount of hard carbide in the structure. However, in the case of direct production from a molten metal such as a centrifugal casting method, the solidification rate may be slow, and coarsening and segregation of carbides are likely to occur. Due to these high hardness carbides and their coarsening, heat crack resistance is impaired. The present invention has been made in view of the above points, and an object of the present invention is to provide a tool material for hot working, which has excellent wear resistance and improved heat crack resistance.
【０００４】[0004]
【課題を解決するための手段】本発明の要旨は、重量％
で、Ｃ：１．０〜２．５％、Ｓｉ：０．３〜２．０％、
Ｍｎ：０．１〜２．０％、Ｃｒ：３．０〜１０．０％、
Ｍｏ≦６．０％、Ｗ≦６．０％、Ｖ：４．０〜１５．０
％、残部Ｆｅおよび不可避不純物よりなる成分に、Ｔｉ
及びＺｒを少なくとも１種類以上を重量％で０．０１〜
１．０％含有し、さらに、Ｍｇ、Ｃａ、Ｃｅの少なくと
も１種以上を０．００１〜０．２％含有することを特徴
とする熱間加工用工具材、さらに、これに好ましくは重
量％でＢを０．００２〜０．０２％含有する熱間加工用
工具材である。SUMMARY OF THE INVENTION The gist of the present invention is the weight%
And C: 1.0 to 2.5%, Si: 0.3 to 2.0%,
Mn: 0.1 to 2.0%, Cr: 3.0 to 10.0%,
Mo ≦ 6.0%, W ≦ 6.0%, V: 4.0-15.0
%, The balance Fe and unavoidable impurities, Ti
And at least one Zr in 0.01% by weight.
1.0% and further 0.001 to 0.2% of at least one kind of Mg, Ca, and Ce is contained, and a hot working tool material, further preferably wt% It is a tool material for hot working containing 0.002 to 0.02% of B.
【０００５】[0005]
【発明の実施の形態】以下に本発明による熱間加工用工
具材について詳細に説明する。本発明の熱間加工用工具
材を、上記のような成分系に限定した理由をまず説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION The tool material for hot working according to the present invention will be described in detail below. First, the reason why the tool material for hot working of the present invention is limited to the above component system will be described.
【０００６】Ｃの含有量を１．０から２．５％としたの
は、ＣはＣｒ、Ｖ、Ｍｏ、Ｗと化合し、硬度の高いＭＣ
型、Ｍ3 Ｃ型、Ｍ7 Ｃ3 型の炭化物を晶析出させ耐摩耗
性を向上させる。下限の１．０％は、それ未満の添加で
は炭化物量が少なく充分な耐摩耗性が得られないからで
あり、上限の２．５％は、これを超える添加では炭化物
が多すぎて靭性が低下するため望ましくないからであ
る。The content of C is set to 1.0 to 2.5% because MC is a compound of Cr, V, Mo and W, and has a high hardness.
-Type, M 3 C-type and M 7 C 3 -type carbides are crystallized to improve wear resistance. The lower limit of 1.0% is because addition of less than that causes the amount of carbides to be insufficient and sufficient wear resistance cannot be obtained, while the upper limit of 2.5% causes addition of too much carbides and toughness. This is because it decreases, which is not desirable.
【０００７】Ｓｉの含有量を０．３〜２．０％としたの
は、良好な鋳造性を得るためであり、通常０．３〜２．
０％の範囲添加する。Ｍｎの含有量を０．１〜２．０％
としたのは、溶湯の脱酸、脱硫のためであり、通常０．
１〜２．０％の範囲添加する。The reason why the Si content is set to 0.3 to 2.0% is to obtain good castability, and it is usually 0.3 to 2.
Add in the range of 0%. Mn content 0.1-2.0%
The reason for this is that the molten metal is deoxidized and desulfurized, and is usually 0.
Add in the range of 1 to 2.0%.
【０００８】Ｃｒの含有量を３．０〜１０．０％とした
のは、ＣｒはＣと炭化物を生成しやすく耐摩耗性を向上
すること、および一部マトリックス中に固溶して焼入れ
性を向上することから耐摩耗性を改善するためである。
Ｃｒは３．０％以上添加しないとその効果を充分に発揮
しないことから、下限を３．０％とした。また、１０％
を超えて添加すると炭化物が粗大化しやすく耐熱亀裂特
性が悪くなることから、上限を１０．０％とした。The content of Cr is set to 3.0 to 10.0% because Cr is liable to form carbides with C to improve wear resistance, and a part of the solid solution in the matrix forms a hardenability. This is because the wear resistance is improved by improving the wear resistance.
The effect is not fully exhibited unless Cr is added in an amount of 3.0% or more, so the lower limit was made 3.0%. Also, 10%
If added in excess of 10%, the carbides are likely to coarsen and the heat cracking resistance deteriorates, so the upper limit was made 10.0%.
【０００９】Ｍｏ、Ｗの含有量を６．０％以下としたの
は、両者ともにＣと化合してＭ2 Ｃ、Ｍ6 Ｃ型炭化物を
生成するとともに、マトリックス中に固溶して基地を強
化し、耐摩耗性や高温硬度を向上させるためである。し
かし、Ｍｏ、Ｗが多くなるとネット状の複合炭化物が増
加し、靭性及び耐熱亀裂特性が低下する。また、Ｃｒ、
Ｖ等とのＣ含有量のバランス上、上限を各々６％とし
た。The content of Mo and W is set to not more than 6.0% because both of them combine with C to form M 2 C and M 6 C type carbides and form a solid solution in the matrix to form a matrix. This is for strengthening and improving wear resistance and high temperature hardness. However, when Mo and W increase, the amount of net-like composite carbide increases, and the toughness and heat crack resistance deteriorate. Also, Cr,
In view of the balance of C content with V and the like, the upper limits are set to 6%.
【００１０】Ｖの含有は、ＣとＭＣ型の非常に高硬度の
炭化物を生成し、初晶として生成するため耐摩耗性への
影響が大きい元素である。下限を４．０％としたのは、
これ未満では耐摩耗性が充分でなく、上限を１５％とし
たのは、これを超えるとＶＣ炭化物が均一に生成しにく
くなるからである。[0010] V content is an element which has a great influence on the wear resistance because it forms C and MC type carbides with extremely high hardness and forms as primary crystals. The lower limit is 4.0%,
If it is less than this, the wear resistance is not sufficient, and the upper limit is set to 15%, because if it exceeds this, it becomes difficult to uniformly generate VC carbides.
【００１１】さらに、発明者らは検討を重ねた結果、微
量のＴｉもしくはＺｒの少なくとも１種類に、微量のＭ
ｇ、ＣａもしくはＣｅの１種類以上を添加することによ
り、炭化物の偏析をより強力に防止し、炭化物が微細に
晶析出すること、およびネット状析出を抑制することを
みいだした。その結果、靭性及び熱亀裂特性が改善でき
る。この場合、ＴｉあるいはＺｒ量が０．０１％未満で
はその効果は充分でなく、また、１％を超えて添加して
もその効果は飽和するとともに溶湯と激しく反応するた
め、上限は１％とした。Ｔｉ、Ｚｒは同様な効果を有し
ており、ＴｉとＺｒを併用しても同様な効果を得ること
が出来、その場合は両者の合計重量％は０．０１〜１％
となる。Ｔｉ、Ｚｒの添加法としては、脱酸剤として溶
解初期に添加すれば合理的である。Further, as a result of repeated studies by the inventors, a trace amount of M is added to a trace amount of at least one of Ti or Zr.
It was found that by adding at least one of g, Ca or Ce, the segregation of carbides can be more strongly prevented, the carbides can be finely crystallized, and the net-like precipitation can be suppressed. As a result, toughness and thermal cracking properties can be improved. In this case, if the amount of Ti or Zr is less than 0.01%, the effect is not sufficient, and even if added in excess of 1%, the effect is saturated and reacts violently with the molten metal, so the upper limit is 1%. did. Ti and Zr have similar effects, and similar effects can be obtained by using Ti and Zr together, in which case the total weight% of both is 0.01 to 1%.
Becomes As a method of adding Ti and Zr, it is rational to add Ti and Zr as a deoxidizing agent at the initial stage of dissolution.
【００１２】一方、Ｍｇ、ＣａもしくはＣｅの少なくと
も１種類の含有量が０．００１％未満ではその効果が充
分でなく、入れすぎると溶湯の攪拌が激しくなり、ガス
等を巻き込みやすくなることから０．２％を超える含有
は好ましくない。最終的には、炭化物の量により、添加
量は調節すればよい。Ｍｇ、ＣａもしくはＣｅの添加は
Ｔｉ或いはＺｒ脱酸後、接種と同様に処理すればよい。On the other hand, if the content of at least one of Mg, Ca or Ce is less than 0.001%, its effect is not sufficient, and if it is added too much, stirring of the molten metal becomes vigorous and it becomes easy to entrain gas and the like. The content exceeding 0.2% is not preferable. Finally, the addition amount may be adjusted depending on the amount of carbide. The addition of Mg, Ca or Ce may be carried out in the same manner as inoculation after deoxidizing Ti or Zr.
【００１３】さらに、Ｂを上記組成に添加するとより炭
化物の微細化および組織の結晶粒の微細化をはかること
ができる。Ｂの添加は０．００２％未満では十分な効果
を発揮できず、多すぎると材質的に脆くなるため０．０
２％で十分である。Further, by adding B to the above composition, it is possible to further refine the carbide and refine the crystal grains of the structure. If the addition of B is less than 0.002%, the sufficient effect cannot be exhibited, and if it is too large, the material becomes brittle, so 0.0
2% is sufficient.
【００１４】上記記載組成以外に、より一層の焼入れ性
の向上をはかるためＮｉを、また圧延使用中の焼戻し抵
抗を向上する意味でＣｏを、それぞれ通常添加される範
囲内で添加してもよい。In addition to the composition described above, Ni may be added for the purpose of further improving the hardenability, and Co for the purpose of improving the tempering resistance during rolling use may be added within the range usually added. .
【００１５】なお、本発明工具材をロールに適用する場
合に、ロールの製造にあたっては、熱処理等により硬度
としてはＨｓ８０〜９０に調節して耐摩耗性の維持をは
かるため、その強度上、内部に高靭性材を有する複合ロ
ールとなる。外層の製造法としては、ＣＰＣ法（連続溶
湯鋳掛け法）や遠心鋳造法等を利用すればよい。又、本
発明の熱間加工用工具材は、シームレス鋼管圧延のプラ
グ等の工具や熱間押出し用、熱間鍛造用等の工具にも適
用可能である。When the tool material of the present invention is applied to a roll, in manufacturing the roll, the hardness is adjusted to Hs 80 to 90 by heat treatment or the like to maintain wear resistance. The composite roll has a high toughness material. As a method for manufacturing the outer layer, a CPC method (continuous molten metal casting method), a centrifugal casting method, or the like may be used. Further, the hot working tool material of the present invention can be applied to a tool such as a plug for seamless steel pipe rolling, a tool for hot extrusion and a tool for hot forging.
【００１６】[0016]
【実施例】本発明の実施例として表１に示す成分のグレ
ンロール材、一般的なハイス材、本発明によるロール材
について熱間摩耗試験および熱亀裂試験を行なった。熱
間摩耗試験は、図１に示すようなディスク対ディスクタ
イプの転動摩耗試験により行い、圧延材に相当する加熱
片の温度は、８５０℃で、またディスク間の接触応力は
約３０kgf/mm2 で、ディスク間のすべりは１１％にて行
なった。一方、熱亀裂試験は、５００℃にて１５分加熱
後、どぶ漬水冷の繰り返しを行いクラック発生の回数で
比較した。なお、耐摩耗性はハイス比１．２以上を効果
有りとした。EXAMPLES As an example of the present invention, a hot rolling test and a thermal cracking test were conducted on a grain roll material having the components shown in Table 1, a general high speed steel material and a roll material according to the present invention. The hot wear test is performed by a disk-to-disk type rolling wear test as shown in FIG. 1, the temperature of the heating piece corresponding to the rolled material is 850 ° C., and the contact stress between the disks is about 30 kgf / mm. In step 2 , slip between disks was performed at 11%. On the other hand, in the heat crack test, after heating at 500 ° C. for 15 minutes, cooling with dobu-zuke was repeated and the number of cracks was compared. The wear resistance was determined to be effective when the HSS ratio was 1.2 or more.
【００１７】表２より、本発明材は現状材より耐摩耗性
・耐熱亀裂性に優れ、特に耐熱亀裂特性の改善が大きい
ことがわかる。なお、比較例１はＴｉが下限値以下であ
り、耐摩耗性と耐熱亀裂性に劣り、比較例２はＴｉが上
限値を超えており、溶湯との反応が大きくなり、やや耐
熱亀裂性が劣る結果となった。比較例３〜６は、Ｍｇ、
Ｃａ、Ｃｅの添加量が不足しており、耐摩耗性と耐熱亀
裂性が改善されなかったものである。From Table 2, it can be seen that the material of the present invention is superior to the existing material in abrasion resistance and heat crack resistance, and in particular, the heat crack characteristics are greatly improved. In Comparative Example 1, Ti is at most the lower limit value and inferior in wear resistance and heat crack resistance, and in Comparative Example 2, Ti exceeds the upper limit value, the reaction with the molten metal is large, and the heat crack resistance is slightly high. The result was inferior. Comparative Examples 3 to 6 are Mg,
The amounts of Ca and Ce added were insufficient, and the wear resistance and heat crack resistance were not improved.
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【表２】 [Table 2]
【００２０】[0020]
【発明の効果】上記本発明の組成よりなる熱間加工用工
具材を使用することにより、高硬度による耐摩耗性と炭
化物の微細分布化による熱亀裂特性の向上が可能とな
り、長寿命の材料が得られる。そして、製品品質の向
上、作業率の向上、工具材原単位の向上等、その効果は
大きい。特に、本発明は熱間圧延用ロール材に最適な材
料であるといえる。By using the hot working tool material having the composition of the present invention, it is possible to improve wear resistance due to high hardness and thermal cracking characteristics due to fine distribution of carbides, and a long-life material. Is obtained. And, the effect is great, such as improvement of product quality, improvement of work rate, and improvement of tool material basic unit. In particular, it can be said that the present invention is an optimum material for a roll material for hot rolling.
【図１】各種ロール材の熱間における摩耗量を評価する
試験機の構成を示す図である。FIG. 1 is a diagram showing a configuration of a tester that evaluates the amount of wear of various roll materials during heat.
１ 加熱コイル ２ 加熱片（圧延材相当） ３ 試験片（ロール材相当） 1 heating coil 2 Heating pieces (corresponding to rolled material) 3 test pieces (equivalent to roll material)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 濱渦 修一 千葉県富津市新富20−１ 新日本製鐵株 式会社 技術開発本部内 (56)参考文献 特開 平９−49051（ＪＰ，Ａ) 特開 平３−285703（ＪＰ，Ａ) 特開 平３−53041（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 38/00 - 38/60 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shuichi Hamazu Shuichi Hamazu 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Co., Ltd. Technology Development Division JP-A-3-285703 (JP, A) JP-A-3-53041 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C22C 38/00-38/60
Claims (2)
０１〜１．０％、さらに、Ｍｇ、Ｃａ、Ｃｅの少なくと
も１種類以上を０．００１〜０．２％含有し、残部Ｆｅ
および不可避不純物よりなることを特徴とする熱間加工
用工具材。1. By weight%, C: 1.0 to 2.5% Si: 0.3 to 2.0% Mn: 0.1 to 2.0% Cr: 3.0 to 10.0% Mo ≦ 6.0% W ≦ 6.0% V: 4.0 to 15.0% is contained, and at least one kind of Ti and Zr is added to 0.
01 to 1.0%, 0.001 to 0.2% of at least one kind of Mg, Ca and Ce, and the balance Fe
And a tool material for hot working characterized by comprising unavoidable impurities.
有する請求項１記載の熱間加工用工具材。2. The tool material for hot working according to claim 1, which contains 0.002 to 0.02% by weight of B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34814098A JP3482349B2 (en) | 1998-12-08 | 1998-12-08 | Hot working tool materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34814098A JP3482349B2 (en) | 1998-12-08 | 1998-12-08 | Hot working tool materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000169940A JP2000169940A (en) | 2000-06-20 |
| JP3482349B2 true JP3482349B2 (en) | 2003-12-22 |
Family
ID=18395024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34814098A Expired - Fee Related JP3482349B2 (en) | 1998-12-08 | 1998-12-08 | Hot working tool materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3482349B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3859958B2 (en) * | 2000-11-20 | 2006-12-20 | 日鉄住金ロールズ株式会社 | Outer layer material of composite roll for centrifugal casting |
-
1998
- 1998-12-08 JP JP34814098A patent/JP3482349B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000169940A (en) | 2000-06-20 |
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