JPH0531508A - Wear resistant and thermal cracking resistant roll material for hot rolling - Google Patents
Wear resistant and thermal cracking resistant roll material for hot rollingInfo
- Publication number
- JPH0531508A JPH0531508A JP19152891A JP19152891A JPH0531508A JP H0531508 A JPH0531508 A JP H0531508A JP 19152891 A JP19152891 A JP 19152891A JP 19152891 A JP19152891 A JP 19152891A JP H0531508 A JPH0531508 A JP H0531508A
- Authority
- JP
- Japan
- Prior art keywords
- thermal cracking
- wear resistance
- roll
- roll material
- hot rolling
- 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.)
- Granted
Links
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- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐摩耗性、耐熱亀裂性
に優れた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 roll material for hot rolling which is excellent in wear resistance and heat crack resistance.
【０００２】[0002]
【従来の技術】最近の高負荷、高熱負荷操業に従い、熱
間圧延用ロールとしては、高温度における耐摩耗性、耐
熱亀裂性が強く要求される。これまで熱延ロールとして
は、主にアダマイト材やグレン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
を有している。2. Description of the Related Art In accordance with the recent high load and high heat load operation, a hot rolling roll is strongly required to have wear resistance and heat crack resistance at high temperature. Up to now, as hot rolling rolls, mainly adamite materials and grain materials have been used,
Recently, a high Cr cast iron material containing about 15 to 20% Cr 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. But,
These roll materials crystallize and precipitate extremely hard carbides, and have a problem that they are excellent in wear resistance but inferior in heat crack 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、耐摩耗性に優れるとともに耐熱亀裂性を改善し
たロール材を提供するためになされた。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 to provide a roll material having 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、Ｃ：１．０〜
２．５％，Ｓｉ：０．３〜２．０％，Ｍｎ：０．１〜
２．０％，Ｃｒ：６．０〜１５．０％，Ｍｏ＜６．０
％，Ｗ＜６．０％，Ｖ：４．０〜８．０％，残部Ｆｅお
よび不可避不純物よりなる成分に、Ｔｉ：０．０１〜
２．０％添加することを特徴とする耐摩耗・耐熱亀裂ロ
ール材である。The present invention provides C: 1.0-
2.5%, Si: 0.3 to 2.0%, Mn: 0.1
2.0%, Cr: 6.0 to 15.0%, Mo <6.0
%, W <6.0%, V: 4.0-8.0%, the balance Fe and inevitable impurities, Ti: 0.01-
It is a wear-resistant / heat-resistant crack roll material characterized by adding 2.0%.
【０００５】[0005]
【作用】以下に本発明によるロール材について詳細に説
明する。上記のような成分系に限定した理由をまず説明
する。 Ｃの含有量を１．０から２．５％としたのは、ＣはＣ
ｒ，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、こ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。上限の２．５％
は、これを越えた添加では炭化物は多すぎて靭性が低下
するため望ましくない。The roll material according to the present invention will be described in detail below. First, the reason for limiting to the above component system will be described. The content of C is set to 1.0 to 2.5% because C is C
MC type with high hardness combined with r, V, Mo, W, M 3 C
Type and M 7 C 3 type carbides are crystallized to improve wear resistance. If the lower limit of 1.0% is added, the amount of carbides is small and sufficient wear resistance cannot be obtained if the content is less than this. 2.5% of the upper limit
However, if the amount of addition exceeds this value, the amount of carbides is too large and the toughness decreases, which is not desirable.
【０００６】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％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％添加する。The content of Si is set to 0.3 to 2.0% in order to obtain good castability, and usually 0.3 to 2.
Add 0%. The Mn content of 0.1 to 2.0% is for deoxidation and desulfurization of the molten metal, and is usually 0.1 to 2.0%.
Add 2.0%.
【０００７】Ｃｒの含有量を６．０〜１５．０％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。Ｃｒ量の下限はＶＣ
をはじめとする他の炭化物とのバランス上６．０％とし
た。また、１５．０％超にな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１５．０％
とした。The content of Cr is set to 6.0 to 15.0%, because Cr easily forms C and carbides and improves wear resistance, and some of them form a solid solution in the matrix to improve hardenability. Therefore, the abrasion resistance is improved. The lower limit of the amount of Cr is VC
In view of the balance with other carbides such as If it exceeds 15.0%, the carbides are likely to be coarsened and the heat cracking resistance is deteriorated. Therefore, the upper limit is 15.0%.
And
【０００８】Ｍｏ、Ｗの含有量を６．０％未満としたの
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する。しかし、Ｍｏ、
Ｗが多くなるとネット状の複炭化物が増加し、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６．０％とした。The content of Mo and W is set to less 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. Strengthens and improves wear resistance and high temperature hardness. But Mo,
When W is increased, net-like double carbides are increased, and toughness and heat crack resistance are deteriorated. In addition, in view of the balance of C content with Cr, V, etc., the upper limits are set to 6.0%.
【０００９】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。Ｖの含有量４．０％未満では
耐摩耗性が充分でない。上限を８．０％としたのは、他
の炭化物とのバランス上、均一分布が可能な範囲とし
た。The content of V is an element which has a great influence on the wear resistance because it forms C and MC type carbides having extremely high hardness and forms carbides as primary crystals. If the V content is less than 4.0%, the wear resistance is insufficient. The upper limit is set to 8.0% in the range where uniform distribution is possible in consideration of balance with other carbides.
【００１０】さらに、発明者らは検討を重ねた結果、微
量のＴｉを添加するとＴｉ酸化物の周辺に炭化物が微細
に晶析出すること，および亀裂伝播のもととなるネット
状炭化物の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
量が０．０１％未満ではその効果は充分でなく、２．０
％以下でその効果は充分発揮される。最終的には、炭化
物の量により、添加量は調節すればよい。なお、Ｔｉの
添加法としては、脱酸剤として添加すると合理的であ
る。また、確実にＴｉ酸化物を生成するため同時にＦｅ
3 Ｏ4 やＦｅＯ等のスケールを添加するとより効果的で
ある。Further, as a result of repeated studies by the inventors, the addition of a small amount of Ti causes fine crystal precipitation of carbide around the Ti oxide, and precipitation of net-like carbide which causes crack propagation. I found to suppress it. As a result, toughness and thermal cracking properties can be improved. In this case, Ti
If the amount is less than 0.01%, the effect is not sufficient.
%, The effect is fully exhibited. Finally, the added amount may be adjusted depending on the amount of carbide. In addition, as a method of adding Ti, it is rational to add Ti as a deoxidizing agent. At the same time, Fe is formed to surely generate Ti oxide.
It is more effective to add a scale such as 3 O 4 or FeO.
【００１１】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。なお、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）等を利用すればよい。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. In manufacturing the roll, the hardness is adjusted to Hs 80 to 90 by heat treatment or the like to maintain the wear resistance, and therefore the composite roll has a high toughness material inside because of its strength. As a method for producing the outer layer, a CPC method (continuous molten metal casting method) or the like may be used.
【００１２】[0012]
【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３０ kgf／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迄の回
数で比較した。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 a composition 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 / In mm 2 , the slip between disks was performed at 11%. On the other hand, in the thermal crack test, after heating at 500 ° C. for 15 minutes, cooling with dobu-zuke was repeated and the number of times until cracking was compared.
【００１３】尚、各種試験に先立ち、Ｔｉ添加量と炭化
物サイズを検討したが、その結果を図２に示す。図よ
り、Ｔｉ添加による炭化物の微細化効果がわかる。表２
より、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。Prior to various tests, the amount of Ti added and the carbide size were examined, and the results are shown in FIG. From the figure, the effect of refining the carbide by adding Ti can be seen. Table 2
From the above, it can be seen that the invention material is superior in wear resistance and heat crack resistance to the current material, and in particular, the heat crack resistance is greatly improved.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【表２】 [Table 2]
【００１６】[0016]
【発明の効果】上記発明組成よりなるロールを使用する
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、高ロール寿命
が得られ、ロール交換の減少による作業率の向上やロー
ル原単位の低減等、その効果は大きい。EFFECTS OF THE INVENTION By using a roll having the above composition, wear resistance due to high hardness and thermal cracking characteristics due to fine distribution of carbides can be improved, a long roll life can be obtained, and roll replacement can be reduced. The effect is large, such as improvement of work rate and reduction of roll unit.
【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 heating.
【図２】本発明におけるＴｉ添加量と各種晶析出炭化物
のサイズを示す図である。FIG. 2 is a diagram showing the amount of Ti added and the sizes of various crystal-precipitated carbides in the present invention.
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 (corresponding to roll material)
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成３年１２月２０日[Submission date] December 20, 1991
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１５[Correction target item name] 0015
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１５】[0015]
【表２】 ─────────────────────────────────────────────────────
[Table 2] ─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成３年１２月２０日[Submission date] December 20, 1991
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１５[Correction target item name] 0015
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１５】[0015]
【表２】 ─────────────────────────────────────────────────────
[Table 2] ─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年４月２３日[Submission date] April 23, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１５[Correction target item name] 0015
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１５】[0015]
【表２】 [Table 2]
───────────────────────────────────────────────────── フロントページの続き (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 日本製鐵株式会社機械・プラント事業部内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Hashimoto 46-59 Nakahara, Tobata-ku, Kitakyushu City, Fukuoka Prefecture Nippon Steel Corporation Machinery & Plant Division
Claims (1)
２．０％，Ｍｎ：０．１〜２．０％，Ｃｒ：６．０〜１
５．０％，Ｍｏ＜６．０％，Ｗ＜６．０％，Ｖ：４．０
〜８．０％，残部Ｆｅおよび不可避不純物よりなる成分
に、Ｔｉ：０．０１〜２．０％を添加することを特徴と
する耐摩耗性・耐熱亀裂性ロール材。Claims: C: 1.0 to 2.5%, Si: 0.3 to
2.0%, Mn: 0.1 to 2.0%, Cr: 6.0 to 1
5.0%, Mo <6.0%, W <6.0%, V: 4.0
A wear-resistant and heat-cracking roll material, characterized in that Ti: 0.01-2.0% is added to a component consisting of ˜8.0%, balance Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19152891A JP2886368B2 (en) | 1991-07-31 | 1991-07-31 | Wear-resistant and heat-resistant crack roll material for hot rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19152891A JP2886368B2 (en) | 1991-07-31 | 1991-07-31 | Wear-resistant and heat-resistant crack roll material for hot rolling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0531508A true JPH0531508A (en) | 1993-02-09 |
| JP2886368B2 JP2886368B2 (en) | 1999-04-26 |
Family
ID=16276169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19152891A Expired - Lifetime JP2886368B2 (en) | 1991-07-31 | 1991-07-31 | Wear-resistant and heat-resistant crack roll material for hot rolling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2886368B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5025315B2 (en) * | 2007-04-19 | 2012-09-12 | 株式会社フジコー | Composite roll for hot rolling, method for producing composite roll for hot rolling, and hot rolling method |
| CN102296240B (en) * | 2011-08-12 | 2013-02-20 | 山东省四方技术开发有限公司 | Preparation method of steel pipe and cold-formed steel high-chromium roller |
-
1991
- 1991-07-31 JP JP19152891A patent/JP2886368B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2886368B2 (en) | 1999-04-26 |
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| Date | Code | Title | Description |
|---|---|---|---|
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Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990112 |