JP2003049248A - Tool material for hot working - Google Patents
Tool material for hot workingInfo
- Publication number
- JP2003049248A JP2003049248A JP2001239553A JP2001239553A JP2003049248A JP 2003049248 A JP2003049248 A JP 2003049248A JP 2001239553 A JP2001239553 A JP 2001239553A JP 2001239553 A JP2001239553 A JP 2001239553A JP 2003049248 A JP2003049248 A JP 2003049248A
- Authority
- JP
- Japan
- Prior art keywords
- wear resistance
- hot working
- tool material
- resistance
- carbides
- 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.)
- Withdrawn
Links
Abstract
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
間圧延用工具材としては、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、熱間圧延ロールとしては、主にアダマイト
材や合金グレン材等が使用されてきたが、最近では、Ｃ
ｒ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適用が拡大されて
いる。さらに、高Ｃｒ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お
り、ロール寿命は、この亀裂進展度によってほぼ決定付
けられる。ロール寿命を伸ばすためには耐摩耗性を犠牲
にすることなく、亀裂の進展を如何に抑制するかが重要
である。2. Description of the Related Art In accordance with the recent high load and high heat load operation, a tool material for hot rolling is strongly required to have wear resistance and heat crack resistance at high temperature. Up to now, as a hot working tool material, for example, a hot rolling roll, an adamite material or an alloy grain material has been mainly used.
A high Cr cast iron material containing r of about 15 to 20% has been developed, and its application is rapidly expanding due to its good wear resistance. Furthermore, rolls of high-speed steel, which has better wear resistance than high-Cr cast iron, are emerging. However, these roll materials crystallize and precipitate very hard carbides, and have a problem of poor heat crack resistance even though they have excellent wear resistance, and the roll life is almost determined by the crack growth rate. To be In order to extend the roll life, it is important to suppress the growth of cracks without sacrificing 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沢山晶析出させるこ
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あり、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 precipitate a large amount of hard carbide in the structure. However, the solidification rate may be slow when directly manufacturing from molten metal such as centrifugal casting,
It tends to cause coarsening and segregation of carbides. 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 thermal crack resistance.
【０００４】[0004]
【課題を解決するための手段】本発明は上記課題に関し
て鋭意研究を行なった結果、以下に記述する構成によっ
て課題を解決できることを見いだした。As a result of intensive studies on the above-mentioned problems, it was found that the present invention can solve the problems by the constitution described below.
【０００５】（１）質量％でＣ：１．０〜２．５％、Ｓ
ｉ：０．３〜２．０％、Ｍｎ：０．１〜２．０％、Ｃ
ｒ：３．０〜１０．０％、Ｍｏ：３．０〜６．０％、
Ｖ：４．０〜１５．０％、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。
（２）質量％でＴｉ、Ｚｒの少なくとも１種類以上を
０．０１〜１．０％含有したことを特徴とする上記
（１）記載の熱間加工用工具材。
（３）質量％でＢを０．００２〜０．０２％含有するこ
とを特徴とする上記（１）又は（２）記載の熱間加工用
工具材。(1) C: 1.0 to 2.5% by mass%, S
i: 0.3 to 2.0%, Mn: 0.1 to 2.0%, C
r: 3.0 to 10.0%, Mo: 3.0 to 6.0%,
V: 4.0 to 15.0%, 0.001 to 0.2% of at least one kind of Mg, Ca and Ce, balance Fe
And a tool material for hot working characterized by comprising unavoidable impurities. (2) The tool material for hot working according to (1) above, which contains 0.01 to 1.0% by mass of at least one of Ti and Zr. (3) 0.002 to 0.02% of B is contained by mass%, The tool material for hot workings of said (1) or (2) characterized by the above-mentioned.
【０００６】[0006]
【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、上記のような組成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 hot working tool material of the present invention is limited to the above composition will be described.
【０００７】Ｃの含有量を１．０から２．５％としたの
は、ＣはＣｒ、Ｖ、Ｍｏと化合し、硬度の高いＭＣ型、
Ｍ2 Ｃ型、Ｍ7 Ｃ3 型の炭化物を析出させ耐摩耗性を向
上させる。下限の１．０％は、それ以下の添加では炭化
物量が少なく充分な耐摩耗性が得られない。上限の２．
５％は、これを越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 C is a compound of Cr, V and Mo and has high hardness.
Precipitates M 2 C type and M 7 C 3 type carbides to improve wear resistance. If the lower limit of 1.0% is added, the amount of carbide is small and sufficient wear resistance cannot be obtained. The upper limit of 2.
5% is not desirable because the addition of more than 5% causes too much carbide and lowers toughness.
【０００８】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 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%.
【０００９】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％
を越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%.
【００１０】Ｍｏの含有量を３．０〜６．０％以下とし
たのは、Ｃと化合してＭ2 Ｃ、Ｍ6Ｃ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する。Ｍｏが下限以下では炭
化物量が少なく、また、基地中へ固溶するＭｏ量が少な
くなり、充分な耐摩耗性および高温強度が確保できなく
なるため、下限を３％とした。一方、Ｍｏが多くなると
ネット状の複合炭化物（Ｍｏ、Ｃｒ、Ｆｅ等を含有した
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６
％とした。The content of Mo is set to 3.0 to 6.0% or less because it combines with C to form M 2 C and M 6 C type carbides and forms a solid solution in the matrix to form a matrix. Strengthen,
Improves wear resistance and high temperature hardness. If the Mo content is less than the lower limit, the amount of carbide is small, and the amount of Mo dissolved in the matrix is small, so that sufficient wear resistance and high temperature strength cannot be ensured, so the lower limit was made 3%. On the other hand, when the content of Mo is large, the amount of net-shaped composite carbide (carbide containing Mo, Cr, Fe, etc.) is increased, and the toughness and heat cracking resistance are deteriorated.
Also, in terms of the balance of C content with Cr, V, etc., the upper limit is 6
%.
【００１１】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、
これ以下では耐摩耗性が充分でなく、上限を１５％とし
たのは、これを越えるとＶＣ炭化物が粗大化するととも
に均一に生成しにくくなるからである。[0011] V content is an element having a great influence on the wear resistance because it forms C and MC type carbides having 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, VC carbides become coarse and it is difficult to uniformly generate them.
【００１２】発明者らは鋭意研究を行なった結果、上記
組成材に微量のＭｇ、ＣａもしくはＣｅの１種類以上を
添加することにより、炭化物の偏析を強力に防止し、炭
化物が微細に析出すること、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
を改善できる。As a result of intensive studies, the inventors of the present invention strongly prevent segregation of carbides and finely precipitate carbides by adding a trace amount of one or more kinds of Mg, Ca or Ce to the above-mentioned composition material. It was found that the formation of a net-like precipitate was suppressed. As a result, toughness and thermal cracking properties can be improved.
【００１３】この場合、Ｍｇ、ＣａもしくはＣｅは、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％を越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、接種と同様
に処理すればよい。これらの添加はそれぞれ単独でもよ
いが、Ｍｇ−Ｓｉ−Ｆｅ合金、Ｃａ−Ｓｉ合金、Ｍｇ−
Ｎｉ合金等の形で添加しても良い。なお、これらの添加
に先立ち、通常行われるＡｌ脱酸等を行っても良い。In this case, if the content of Mg, Ca, or Ce is less than 0.001%, the effect is not sufficient, and if the content is too much, the molten metal becomes violently stirred, and the gas and the like are easily entrained. %, The content 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 performed in the same manner as inoculation. These additives may be added individually, but Mg-Si-Fe alloy, Ca-Si alloy, Mg-
You may add in the form of Ni alloy etc. Prior to the addition of these, the usual Al deoxidation or the like may be performed.
【００１４】発明者らは、さらに検討を重ねた結果、Ｍ
ｇ、ＣａもしくはＣｅに加え、Ｔｉ、Ｚｒのいずれか１
種以上を添加すれば、より効果的に炭化物を微細均一に
析出させることを見出した。As a result of further studies, the inventors have found that M
In addition to g, Ca or Ce, either Ti or Zr 1
It has been found that carbides can be more effectively and finely and uniformly precipitated by adding more than one kind.
【００１５】ＴｉあるいはＺｒの含有量が０．０１％未
満ではその効果は充分でなく、また、１．０％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１．０％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
果を得ることができ、その場合は両者の合計質量％は
０．０１〜１．０％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。If the content of Ti or Zr is less than 0.01%, the effect is not sufficient, and if added in excess of 1.0%, the effect is saturated and reacts violently with the molten metal. Was 1.0%. Ti and Zr have similar effects, and similar effects can be obtained by using Ti and Zr together, in which case the total mass% of both is 0.01 to 1.0%. 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.
【００１６】さらに、Ｂを上記組成に添加するとより一
層の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％未満では充分
な効果を発揮できず、多すぎると材質的に脆くなるため
０．０２％で充分である。Further, when B is added to the above composition, further refinement of carbides and refinement of crystal grains of the structure can be achieved. 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 0.02% is sufficient.
【００１７】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、圧延使用中の焼戻し抵抗を
向上する意味でＣｏを通常添加される範囲内で添加して
もよい。また、請求項で記載した不可避不純物元素は
Ｐ、Ｓ、Ａｌ等である。In addition to the composition described above, Ni may be added within the range where Co is usually added in order to improve the tempering resistance during rolling in order to further improve the hardenability. Further, the unavoidable impurity elements described in the claims are P, S, Al and the like.
【００１８】なお、本発明の熱間加工用工具材をロール
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、ＣＰ
Ｃ法（連続溶湯鋳掛け法）や遠心鋳造法等を利用すれば
よい．また、本発明の熱間加工用工具材は、シームレス
鋼管圧延のプラグや、熱間押出し用のマンドレルやダイ
ス、熱間鍛造用金型等にも適用可能である。When the tool material for hot working according to the present invention is applied to a roll, the hardness is adjusted to Hs 80 to 90 by heat treatment or the like in the manufacture of the roll to maintain wear resistance. Due to its strength, the composite roll has a high toughness material inside. As a method of manufacturing the outer layer, CP
C method (continuous molten metal casting method) or centrifugal casting method may be used. The hot working tool material of the present invention is also applicable to a plug for seamless steel pipe rolling, a mandrel or die for hot extrusion, a die for hot forging, and the like.
【００１９】[0019]
【実施例】本発明の実施例として表１に示す成分の合金
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２９４MPa 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、直径２５mm×長さ２
５mmの円柱ブロックを４００〜７００℃の温度で１５分
加熱後、どぶ漬水冷を行い、クラックが発生した温度で
比較した。温度間隔は２５℃毎に行なった。EXAMPLE As an example of the present invention, the alloy grain roll material having the components shown in Table 1, a general high speed steel material and the roll material according to the present invention were subjected to a hot wear test and a heat crack test. 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 approximately 294 MPa. Sliding between disks was performed at 11%. On the other hand, the thermal crack test is 25 mm in diameter x 2 in length
After heating a 5 mm columnar block at a temperature of 400 to 700 ° C. for 15 minutes, it was dipped in water and cooled, and the temperatures at which cracks occurred were compared. The temperature interval was 25 ° C.
【００２０】[0020]
【表１】 [Table 1]
【００２１】表２に各試験による各ロール材の特性評価
結果を示した。耐摩耗性と耐熱衝撃性の評価はハイス材
を１とした時の摩耗量比、クラック発生温度比で示し
た。いずれも数値が大きいほど、耐摩耗、耐熱衝撃性が
高いことを示す。なお、耐摩耗性はハイス比１．２以上
を効果有りとした。表２より、本発明材は現状材より耐
摩耗性・耐熱衝撃性が大幅に優れることが判る。Table 2 shows the characteristic evaluation results of each roll material by each test. The evaluation of the wear resistance and the thermal shock resistance was shown by the ratio of the amount of wear and the crack generation temperature ratio when the HSS material was 1. In both cases, the larger the value, the higher the wear resistance and thermal shock resistance. The wear resistance was determined to be effective when the HSS ratio was 1.2 or more. It can be seen from Table 2 that the materials of the present invention have much better wear resistance and thermal shock resistance than the current materials.
【００２２】[0022]
【表２】 [Table 2]
【００２３】[0023]
【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、耐摩耗性および炭化物の微
細分布による耐熱亀裂性の向上が可能となり、長寿命化
をはかることができる。そして、製品品質の向上、作業
率の向上、ロール等の工具原単位の向上等、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。EFFECTS OF THE INVENTION By using the tool material for hot working having the above composition of the present invention, it is possible to improve wear resistance and heat crack resistance due to fine distribution of carbide, and it is possible to prolong the service life. . And, the effect is great, such as improvement of product quality, improvement of work rate, improvement of tool unit such as roll. 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 piece (corresponding to rolled material) 3 ... Test piece (equivalent to roll material)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮武 昌幸 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内 (72)発明者 坂部 健太 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内 (72)発明者 久保 修 福岡県北九州市戸畑区大字中原46−59 新 日本製鐵株式会社エンジニアリング事業本 部内 (72)発明者 橋本 光生 福岡県北九州市戸畑区大字中原46−59 新 日本製鐵株式会社エンジニアリング事業本 部内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Masayuki Miyatake 5-3 Tokai-cho, Tokai-shi, Aichi Nippon Steel Corporation Ceremony Company Nagoya Steel Works (72) Inventor Kenta Sakabe 5-3 Tokai-cho, Tokai-shi, Aichi Nippon Steel Corporation Ceremony Company Nagoya Steel Works (72) Inventor Osamu Kubo 46-59, Nakahara, Tobata-ku, Kitakyushu, Fukuoka New Nippon Steel Co., Ltd. Engineering Business Department (72) Inventor Mitsuo Hashimoto 46-59, Nakahara, Tobata-ku, Kitakyushu, Fukuoka New Nippon Steel Co., Ltd. Engineering Business Department
Claims (3)
０．３〜２．０％、Ｍｎ：０．１〜２．０％、Ｃｒ：
３．０〜１０．０％、Ｍｏ：３．０〜６．０％、Ｖ：
４．０〜１５．０％、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. C: 1.0 to 2.5% by mass%, Si:
0.3-2.0%, Mn: 0.1-2.0%, Cr:
3.0 to 10.0%, Mo: 3.0 to 6.0%, V:
4.0 to 15.0%, at least 1 of Mg, Ca and Ce
A tool material for hot working, characterized by containing 0.001 to 0.2% of at least one kind, and the balance being Fe and unavoidable impurities.
以上を０．０１〜１．０％含有したことを特徴とする請
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 0.01 to 1.0% by mass of at least one kind of Ti and Zr.
有する請求項１又は２記載の熱間加工用工具材。3. The tool material for hot working according to claim 1, which contains 0.002 to 0.02% by mass of B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001239553A JP2003049248A (en) | 2001-08-07 | 2001-08-07 | Tool material for hot working |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001239553A JP2003049248A (en) | 2001-08-07 | 2001-08-07 | Tool material for hot working |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003049248A true JP2003049248A (en) | 2003-02-21 |
Family
ID=19070286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001239553A Withdrawn JP2003049248A (en) | 2001-08-07 | 2001-08-07 | Tool material for hot working |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003049248A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017514016A (en) * | 2014-04-14 | 2017-06-01 | ウッデホルムス アーベーＵｄｄｅｈｏｌｍｓ Ａｂ | Cold work tool steel |
-
2001
- 2001-08-07 JP JP2001239553A patent/JP2003049248A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017514016A (en) * | 2014-04-14 | 2017-06-01 | ウッデホルムス アーベーＵｄｄｅｈｏｌｍｓ Ａｂ | Cold work tool steel |
| US10472704B2 (en) | 2014-04-14 | 2019-11-12 | Uddeholms Ab | Cold work tool steel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20081007 |