JPH0598392A - 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
- JPH0598392A JPH0598392A JP19357391A JP19357391A JPH0598392A JP H0598392 A JPH0598392 A JP H0598392A JP 19357391 A JP19357391 A JP 19357391A JP 19357391 A JP19357391 A JP 19357391A JP H0598392 A JPH0598392 A JP H0598392A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- thermal cracking
- roll material
- resistant
- 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，高熱負荷操業に伴い、熱
間圧延用ロール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。2. Description of the Related Art With the recent high load and high heat load operation, a roll material for hot rolling 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.
【０００３】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。Furthermore, rolls of high-speed steel, which is superior in wear resistance to high Cr cast iron, are emerging. However, these roll materials crystallize and precipitate extremely hard carbides, and thus have a problem that they are excellent in wear resistance but inferior in heat crack resistance.
【０００４】[0004]
【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く晶析出させること
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。Generally, in order to improve wear resistance, it is desirable to precipitate 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.
【０００５】本発明は上記課題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圧
延用ロール材を提供する。The present invention has been made in view of the above problems,
Provided is a roll material for hot rolling, which has excellent wear resistance and improved heat crack resistance.
【０００６】[0006]
【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：３．０〜１０．０％，Ｍｏ＜６．０
％，Ｗ＜６．０％，Ｖ：８．０〜１５．０％，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熱間圧延用耐摩耗
・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: 3.0 to 10.0%, Mo <6.0
%, W <6.0%, V: 8.0-15.0%, balance Fe
And a component consisting of inevitable impurities, Ti: 0.01 to
It is a wear-resistant / heat-resistant crack roll material for hot rolling, which is characterized by adding 2.0%.
【０００７】[0007]
【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。まず上記のような成分系に限定した理由を説明
する。The roll material according to the present invention will be described in detail below. First, the reason for limiting the above component system will be described.
【０００８】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、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、これを超えた添加では炭化物が多すぎ
て靱性が低下するため望ましくない。The content of C is set to 1.0 to 2.5% because C is a compound of Cr, V, Mo, W and has a high hardness.
Type, 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. The upper limit of 2.5% is not desirable because addition of more than 2.5% results in too much carbide and lower toughness.
【０００９】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。The reason why the Si content is 0.3 to 2.0% is to obtain good castability, and it is usually 0.3 to 2.0.
%Added.
【００１０】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 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.
%Added.
【００１１】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、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１０．０％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 the wear resistance, and a part of the Cr forms a solid solution to improve hardenability. The wear resistance is improved by improving. If Cr is not added in an amount of 3.0% or more, its effect will not be sufficiently exerted.
The lower limit was 3.0%. On the other hand, if it exceeds 10.0%, the carbides are likely to be coarsened and the heat cracking resistance is deteriorated, so the upper limit was made 10.0%.
【００１２】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、靱性および耐
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, 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. However, when the amounts of Mo and W increase, the amount of net-shaped double carbides increases, and the toughness and heat cracking properties deteriorate. In addition, in view of the balance of C content with Cr, V, etc., the upper limits are set to 6.0%.
【００１３】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。耐摩耗性の確保と他合金炭化
物とのバランス上、その添加量下限を８．０％とした。
上限を１５．０％としたのは、これ以上ではＶＣ炭化物
が均一に生成しにくくなるからである。The content of V is an element which has a great influence on the wear resistance because it forms C and MC type carbides of extremely high hardness and forms carbides as primary crystals. The lower limit of the amount of addition is set to 8.0% in order to ensure wear resistance and balance with other alloy carbides.
The upper limit is set to 15.0% because if it is more than this, it is difficult to uniformly generate VC carbides.
【００１４】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見出した。その結果、靱
性および熱亀裂特性が改善できる。As a result of further studies by the inventors, the addition of a small amount of Ti suppresses the fine precipitation of carbides around the Ti oxide and the precipitation of net-like carbide which causes crack propagation. I found that As a result, toughness and thermal cracking properties can be improved.
【００１５】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
るために、同時にＦｅ3 Ｏ4 やＦｅＯ等のスケールを添
加するとより効果的である。In this case, if the amount of Ti is less than 0.01%, the effect is not sufficient, and if it is 2.0% or less, the effect is sufficiently exhibited. Finally, the added amount may be adjusted depending on the amount of carbide. It is rational to add Ti as a deoxidizing agent. It is more effective to add a scale such as Fe 3 O 4 or FeO at the same time in order to surely generate Ti oxide.
【００１６】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 may be added within the range that is usually added to improve the tempering resistance during rolling.
【００１７】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
の維持を図るために、その強度上内部に高靱性材を有す
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 manufacturing the roll, the hardness is adjusted to Hs 80 to 90 by heat treatment or the like, and in order to maintain wear resistance, 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.
【００１８】[0018]
【実施例】本発明の実施例および比較例として、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
を行った。EXAMPLES As an example and a comparative 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.
【００１９】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、１はロ
ール材に相当する試験片であり、圧延材に相当する加熱
片２の温度は、加熱コイル３により８５０℃とし、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％にて行った。The hot wear test is carried out by a disk-to-disk type rolling wear test as shown in FIG. 1, 1 is a test piece corresponding to a roll material, and the temperature of a heating piece 2 corresponding to a rolled material is The heating coil 3 was set to 850 ° C., the contact stress between the disks was about 30 kgf / mm 2 , and the slip between the disks was 11%.
【００２０】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。On the other hand, in the thermal crack test, heating at 500 ° C. for 15 minutes and subsequent cooling with dobu-zuke were repeated, and the number of times until cracking was compared.
【００２１】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２よりＴｉ
添加による炭化物の微細化効果が判る。Prior to various tests, the amount of Ti added and the carbide size were examined, and the results are shown in FIG. From Figure 2 Ti
The effect of refining the carbide by the addition is understood.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】表２より、本発明の実施例材は比較例材よ
り耐摩耗性・耐熱亀裂性に優れ、特に耐熱亀裂特性の改
善が大きいことが判る。From Table 2, it can be seen that the materials of Examples of the present invention are superior to the materials of Comparative Examples in abrasion resistance and thermal crack resistance, and particularly, the thermal crack characteristics are greatly improved.
【００２５】[0025]
【発明の効果】以上説明した如く本発明のロール材は、
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って高ロール寿命が得られ、ロ
ール交換の減少による作業能率の向上やロール原単位の
低減等、その効果は大きい。As described above, the roll material of the present invention is
It is possible to improve wear resistance due to high hardness and thermal cracking characteristics due to fine distribution of carbides, resulting in a long roll life, and to improve work efficiency by reducing roll replacement and reduce roll unit consumption. large.
【図１】ロール材の熱間における摩耗量を評価する試験
機の構成を示す図面である。FIG. 1 is a drawing showing a configuration of a testing machine for evaluating a hot wear amount of a roll material.
【図２】本発明におけるＴｉ添加量と各種晶析出炭化物
のサイズを示す図面である。FIG. 2 is a drawing showing the amount of Ti added and the size of various precipitated carbides in the present invention.
１ 試験片（ロール材相当） ２ 加熱片（圧延材相当） ３ 加熱コイル 1 Test piece (corresponding to roll material) 2 Heating piece (corresponding to rolled material) 3 Heating coil
───────────────────────────────────────────────────── フロントページの続き (72)発明者 白石 利幸 千葉県富津市新富20−１ 新日本製鐵株式 会社中央研究本部内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Shiraishi 20-1 Shintomi, Futtsu City, Chiba Shin Nippon Steel Co., Ltd. Central Research Division
Claims (1)
２．０％，Ｍｎ：０．１〜２．０％，Ｃｒ：３．０〜１
０．０％，Ｍｏ＜６．０％，Ｗ＜６．０％，Ｖ：８．０
〜１５．０％，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
とする熱間圧延用耐摩耗・耐熱亀裂ロール材。1. C: 1.0 to 2.5%, Si: 0.3 to
2.0%, Mn: 0.1 to 2.0%, Cr: 3.0 to 1
0.0%, Mo <6.0%, W <6.0%, V: 8.0
A wear-resistant and heat-crack roll material for hot rolling, characterized in that Ti: 0.01 to 2.0% is added to a component consisting of ˜15.0%, balance Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19357391A JP2946129B2 (en) | 1991-07-09 | 1991-07-09 | Wear-resistant and heat-resistant crack roll material for hot rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19357391A JP2946129B2 (en) | 1991-07-09 | 1991-07-09 | Wear-resistant and heat-resistant crack roll material for hot rolling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0598392A true JPH0598392A (en) | 1993-04-20 |
| JP2946129B2 JP2946129B2 (en) | 1999-09-06 |
Family
ID=16310257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19357391A Expired - Fee Related JP2946129B2 (en) | 1991-07-09 | 1991-07-09 | Wear-resistant and heat-resistant crack roll material for hot rolling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2946129B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008264828A (en) | 2007-04-19 | 2008-11-06 | Fujikoo:Kk | Composite roll for hot rolling, manufacturing method of the same and hot rolling method |
| JP2009214122A (en) | 2008-03-07 | 2009-09-24 | Fujico Co Ltd | Composite roll for hot rolling and its manufacturing method |
| EP3187606A4 (en) * | 2014-08-25 | 2018-04-04 | Kubota Corporation | Outer layer material for composite rolls for rolling, and composite roll for rolling |
-
1991
- 1991-07-09 JP JP19357391A patent/JP2946129B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008264828A (en) | 2007-04-19 | 2008-11-06 | Fujikoo:Kk | Composite roll for hot rolling, manufacturing method of the same and hot rolling method |
| JP2009214122A (en) | 2008-03-07 | 2009-09-24 | Fujico Co Ltd | Composite roll for hot rolling and its manufacturing method |
| EP3187606A4 (en) * | 2014-08-25 | 2018-04-04 | Kubota Corporation | Outer layer material for composite rolls for rolling, and composite roll for rolling |
| US10376937B2 (en) | 2014-08-25 | 2019-08-13 | Kubota Corporation | Outer layer material for composite roll for rolling and composite roll for rolling |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2946129B2 (en) | 1999-09-06 |
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