JP2003306740A - Roll for hot rolling of metallic material - Google Patents
Roll for hot rolling of metallic materialInfo
- Publication number
- JP2003306740A JP2003306740A JP2002116007A JP2002116007A JP2003306740A JP 2003306740 A JP2003306740 A JP 2003306740A JP 2002116007 A JP2002116007 A JP 2002116007A JP 2002116007 A JP2002116007 A JP 2002116007A JP 2003306740 A JP2003306740 A JP 2003306740A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- mass
- iron
- hot rolling
- metal
- 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- Withdrawn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
- 238000005098 hot rolling Methods 0.000 title claims abstract description 30
- 239000007769 metal material Substances 0.000 title claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 82
- 229910052742 iron Inorganic materials 0.000 claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
- 239000006104 solid solution Substances 0.000 claims abstract description 15
- 239000010419 fine particle Substances 0.000 claims abstract description 11
- 238000007711 solidification Methods 0.000 claims abstract description 5
- 230000008023 solidification Effects 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract 2
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 12
- 229910052709 silver Inorganic materials 0.000 claims description 12
- 239000004332 silver Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 9
- 238000009750 centrifugal casting Methods 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 229910052720 vanadium Inorganic materials 0.000 abstract description 3
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 239000000243 solution Substances 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 description 12
- 239000010410 layer Substances 0.000 description 7
- 150000001247 metal acetylides Chemical class 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 238000005204 segregation Methods 0.000 description 5
- 229910000997 High-speed steel Inorganic materials 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000573 anti-seizure effect Effects 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金属材料の熱間圧
延用ロールに係わり、特に、鉄鋼材料を熱間圧延する際
に用いても、該ロールの表面に亀裂が入り難く、従来よ
り寿命を延長可能な熱間圧延用ロールに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll for hot rolling a metal material, and particularly when used for hot rolling a steel material, the surface of the roll is less likely to be cracked and has a longer life than before. The present invention relates to a hot rolling roll that can be extended.
【０００２】[0002]
【従来の技術】一般に、金属材料、例えば鋼材や鋼板
は、連続鋳造等で得た鋼鋳片を熱間及び／又は冷間で圧
延して製造される。この圧延には、ロールが使用される
が、該ロールの良否は、製造される鋼材等の価格や品質
に多大な影響を与える。また、近年は、熱間圧延技術の
進歩が目覚しく、それに伴い、使用する熱間圧延用ロー
ルの特性、特に耐摩耗性の向上が強く要求されてきてい
る。このような耐摩耗性の向上要求に対しては、ロール
の外層を高速度工具鋼の組成に類似した組成とし、鋳造
時に硬質な炭化物を析出させて、耐摩耗性を格段に向上
させた高性能ロール（ハイス系ロール）が開発され、実
用化されている。2. Description of the Related Art Generally, a metal material such as a steel material or a steel sheet is manufactured by rolling a steel slab obtained by continuous casting or the like hot and / or cold. A roll is used for this rolling, and the quality of the roll has a great influence on the price and quality of the manufactured steel and the like. Further, in recent years, the progress of hot rolling technology has been remarkable, and along with it, there has been a strong demand for improvement in the characteristics of the hot rolling rolls used, especially in the wear resistance. In order to meet such demands for improvement in wear resistance, the outer layer of the roll has a composition similar to that of high speed tool steel, and hard carbides are precipitated during casting to significantly improve wear resistance. Performance rolls (high speed type rolls) have been developed and put into practical use.
【０００３】例えば、特開平１０−１８３２８９号公報
は、ロール芯材の上に、Ｃ：２．４〜２．９質量％、Ｓ
ｉ：１質量％以下、Ｍｎ：１質量％以下、Ｃｒ：１２〜
１８質量％、Ｍｏ：３〜９質量％、Ｖ：３〜８質量％、
Ｎｂ：０．５〜４質量％を含有し、０．２７≦Ｍｏ／Ｃ
ｒ＜０．７、及びＣ＋０．２Ｃｒ≦６．２を満足する組
成のハイス系外層を有する熱間圧延用ロールを提案して
いる。[0003] For example, Japanese Patent Laid-Open No. 10-183289 discloses that C: 2.4 to 2.9% by mass and S on a roll core material.
i: 1 mass% or less, Mn: 1 mass% or less, Cr: 12 to 12
18% by mass, Mo: 3 to 9% by mass, V: 3 to 8% by mass,
Nb: 0.5 to 4% by mass, 0.27 ≦ Mo / C
A roll for hot rolling having a high-speed outer layer having a composition satisfying r <0.7 and C + 0.2Cr ≦ 6.2 is proposed.
【０００４】ところが、圧延製品の品質向上及び効率的
生産の観点より、熱間圧延用ロールの使用環境はますま
す苛酷になり、生産される圧延製品の品種も多様化して
いるので、ロールの使い易さへの要望が高まっている。
その理由は、鋼板を熱間圧延する際の最終仕上げ圧延ス
タンドでは、鋼板の一部が折り畳まれた状態で圧延され
ることがある（これを絞り圧延事故と称し、特に、板厚
が薄い時に多発する）からである。このような絞り圧延
が発生すると、ロール表面には焼き付きが生じ、ロール
表面にクラックが形成される。このクラックが形成され
たままのロールで圧延を続けると、該クラックは伝播し
てロールの割損に至る。ここで、絞り圧延事故の原因と
しては、使用中のロールのサーマル・クラウン（熱によ
りロールの中央部分の径を最大にして膨れること）にあ
ると考えられている。つまり、サーマル・クラウンが生
じると上下ロール間の間隙（ロール・ギャップ）が小さ
くなり、ロールの通板性が低下して鋼板の蛇行、腹伸
び、耳伸び等が生じ、その結果鋼板の一部が折り畳れて
圧延される所謂「絞り圧延事故」になるのである。However, from the viewpoint of improving the quality of rolled products and efficient production, the environment in which hot rolling rolls are used becomes more and more severe, and the types of rolled products produced are diversified. The demand for ease is increasing.
The reason is that in the final finishing rolling stand when hot rolling a steel sheet, it may be rolled with a part of the steel sheet folded (this is called a drawing rolling accident, especially when the sheet thickness is thin. It often happens). When such reduction rolling occurs, seizure occurs on the roll surface and cracks are formed on the roll surface. When rolling is continued with the rolls in which the cracks are still formed, the cracks propagate and the rolls are damaged. Here, it is considered that the cause of the squeeze rolling accident is the thermal crown of the roll in use (expansion due to heat so as to maximize the diameter of the central portion of the roll). In other words, when a thermal crown is generated, the gap between the upper and lower rolls (roll gap) becomes smaller, and the rollability of the rolls decreases, resulting in meandering, belly extension, edge extension, etc. of the steel sheet, resulting in a part of the steel sheet. It is a so-called "drawing and rolling accident" in which the steel sheets are folded and rolled.
【０００５】前記したような耐摩耗性に優れるハイス系
ロールは、ロールの消耗が少ないので、サーマル・クラ
ウンが見かけ上大きくなって通板性が低下する傾向にあ
り、従って、ロールにクラックが発生し易いという欠点
が回避できない。さらに、この問題に加えて、ハイス系
ロールは、加工性が悪く、クラックを研削で除去するに
は、多大な労力とコストを要するという別の問題があ
り、採用が制限される場合もある。Since the high speed steel roll having excellent wear resistance as described above has less wear of the roll, the thermal crown is apt to be apparently large and the threading property tends to be deteriorated. Therefore, the roll is cracked. The drawback of being easy to do is unavoidable. In addition to this problem, the HSS-based roll has another problem in that it has poor workability and requires a great deal of labor and cost to remove cracks by grinding, and its use may be limited.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、かかる事情
に鑑み、熱間圧延に使用しても、従来に比べてクラック
の発生が少なく、寿命が延長可能な金属材料の熱間圧延
用ロールを提供することを目的としている。SUMMARY OF THE INVENTION In view of such circumstances, the present invention has a roll for hot rolling of a metal material, which has less cracks and has a longer life than conventional ones even when used for hot rolling. Is intended to provide.
【０００７】[0007]
【課題を解決するための手段】発明者は、上記目的を達
成するため鋭意研究し、その成果を本発明に具現化し
た。The inventor has diligently studied in order to achieve the above object, and realized the result in the present invention.
【０００８】すなわち、本発明は、Ｃ：１．６〜２．９
質量％、Ｓｉ：１質量％以下、Ｍｎ：１質量％以下、Ｃ
ｒ：４〜１８質量％，Ｍｏ：１〜９質量％，Ｖ：３〜８
質量％，Ｎｂ：５質量％以下を含有する鉄で外殻を形成
してなるロールであって、前記鉄に、さらに該鉄に非固
溶な金属を含有させ、凝固後のロール使用層に鉄に非固
溶な金属の微粒子を分散させてなることを特徴とする金
属材料の熱間圧延用ロールである。That is, according to the present invention, C: 1.6 to 2.9.
% By mass, Si: 1% by mass or less, Mn: 1% by mass or less, C
r: 4 to 18 mass%, Mo: 1 to 9 mass%, V: 3 to 8
A roll formed by forming an outer shell of iron containing 5% by mass or less and Nb: 5% by mass, wherein the iron further contains a metal insoluble in the iron, and a roll-use layer after solidification is used. A roll for hot rolling of a metal material, characterized in that fine particles of a metal which is non-solid solution in iron are dispersed.
【０００９】この場合、前記鉄に非固溶な金属の含有量
が、０．０２〜１．０体積％であったり、あるいは、前
記凝固後の鉄に非固溶な金属の平均直径が１０〜２０μ
ｍであるのが好ましい。また、前記鉄に非固溶な金属が
銀（Ａｇ）であったり、あるいは前記金属材料が鉄鋼材
料であるのが一層好ましい。さらに、前記外殻を遠心鋳
造で形成させてなるのが好ましい。なお、前記ロール使
用層とは、該ロールの表面近傍の層をいい、ちなみにそ
の厚みは、５０ｍｍ程度である。In this case, the content of the non-solid solution metal in iron is 0.02 to 1.0% by volume, or the average diameter of the non-solid solution metal in iron after solidification is 10%. ~ 20μ
It is preferably m. Further, it is more preferable that the non-solid solution metal in iron is silver (Ag) or the metal material is a steel material. Further, it is preferable that the outer shell is formed by centrifugal casting. The roll-use layer is a layer near the surface of the roll, and its thickness is about 50 mm.
【００１０】本発明によれば、熱間圧延中に、ロール表
面に分散している多数の鉄に非固溶な金属の微小粒子が
揮発し、そこに微小孔を形成するようになる。その結
果、被圧延材とロールとの焼付き頻度が低減し、クラッ
クの発生が従来に比べて格段と生じなくなる。According to the present invention, during hot rolling, a large number of fine particles of a metal which is not solid-dissolved in iron dispersed on the roll surface are volatilized and fine holes are formed therein. As a result, the frequency of seizure between the material to be rolled and the roll is reduced, and cracks are much less likely to occur than in the past.
【００１１】[0011]
【発明の実施の形態】以下、発明をなすに至った経緯を
まじえ、本発明の実施の形態について説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below, including the background of the invention.
【００１２】本発明が対象とするロールは、耐摩耗性を
重視するので、素材の溶鉄を高速度工具鋼の組成に類似
した組成とする。そして、各成分元素の限定理由は、下
記の通りである。
Ｃ：１．６〜２．９質量％
Ｃは、ロールの耐磨耗性を向上するための炭化物形成に
必須の元素である。１．６質量％未満では、凝固後に炭
化物量が不足して、耐磨耗性が優れたロールにならな
い。一方、２．９質量％超えでは、炭化物量が過多にに
なると共に、炭化物の偏析が生じる。
Ｓｉ：１質量％以下
Ｓｉは、脱酸剤として、及び鋳造性確保のために添加す
る。Ｓｉの好適下限値は、０．１質量％であるが、１質
量％を超えて添加しても、添加効果が飽和する。
Ｍｎ：１質量％以下
Ｍｎは、溶鉄中のＳをＭｎＳとして固定し、Ｓの材質へ
の悪影響を除去するために添加する。Ｍｎの好適下限値
も０．１質量％であるが、１質量％を超えて添加しても
効果が飽和する。
Ｃｒ：４〜１８質量％
Ｃｒは、Ｍ7Ｃ3炭化物（ここで、Ｍは金属元素）を適量
出現させ、耐摩耗性と耐肌荒れ性を向上させるために、
４質量％以上添加する必要がある。一方、１８質量％超
えて添加すると、ロールの表面に針状のＣｒ炭化物が晶
出したり、炭化物の偏析を起こし、このロールで圧延し
た製品の表面品質を劣化させる。
Ｍｏ：１〜９質量％
Ｍｏは、上記Ｍ7Ｃ3炭化物中に濃化してそれを強化し、
ロールの耐摩耗性を向上させる効果を発揮すると共に、
偏析の抑制に役立つ。そのためには、最低でも１質量％
以上が必要である。一方、９質量％を超えると、Ｍｏ系
の炭化物が多量に出現し、偏析を助長するばかりでな
く、耐摩耗性を劣化させる。
Ｖ：３〜８質量％
Ｖは、硬質な炭化物を形成させ、ハイス系ロールとして
の一定レベルの耐磨耗性を得るための元素である。その
効果を得るには最低でも３質量％は必要であるが、８質
量％を超えると、溶鉄の融点を上昇させると共に、流動
性を低下させ、鋳造作業にとって好ましくない。
Ｎｂ：５質量％以下
Ｎｂも、ＭＣ炭化物の形成に有効な元素であり、Ｍｏを
炭化物中に濃化させる作用がある。Ｎｂを添加させるこ
とにより、炭化物を強靭にしてロールの耐摩耗性を向上
させる。そのためには、５質量％以下であることが必要
であり、５質量％を超えると、Ｎｂ系炭化物が独自に晶
出し、炭化物の偏析を助長する。Since the roll targeted by the present invention places importance on wear resistance, molten iron as a raw material has a composition similar to that of high speed tool steel. The reasons for limiting each component element are as follows. C: 1.6 to 2.9 mass% C is an essential element for forming carbide for improving the wear resistance of the roll. If it is less than 1.6% by mass, the amount of carbides will be insufficient after solidification, and the roll will not be excellent in abrasion resistance. On the other hand, if it exceeds 2.9 mass%, the amount of carbide becomes excessive and segregation of carbide occurs. Si: 1% by mass or less Si is added as a deoxidizing agent and for ensuring castability. The preferable lower limit value of Si is 0.1% by mass, but the addition effect is saturated even if it is added in an amount exceeding 1% by mass. Mn: 1% by mass or less Mn is added in order to fix S in molten iron as MnS and remove an adverse effect on the material of S. The preferable lower limit of Mn is also 0.1% by mass, but the effect is saturated even if it is added in an amount exceeding 1% by mass. Cr: 4 to 18% by mass Cr is used in order to cause M 7 C 3 carbide (where M is a metal element) to appear in an appropriate amount and to improve wear resistance and rough surface resistance.
It is necessary to add 4 mass% or more. On the other hand, if it is added in an amount of more than 18% by mass, needle-like Cr carbide crystallizes on the surface of the roll or segregation of the carbide occurs, deteriorating the surface quality of the product rolled by this roll. Mo: 1 to 9 mass% Mo is concentrated in the M 7 C 3 carbide to strengthen it,
While exerting the effect of improving the wear resistance of the roll,
Useful for suppressing segregation. For that, at least 1% by mass
The above is necessary. On the other hand, if it exceeds 9 mass%, a large amount of Mo-based carbides appear, which not only promotes segregation but also deteriorates wear resistance. V: 3 to 8 mass% V is an element for forming a hard carbide and obtaining a certain level of wear resistance as a high speed steel roll. At least 3% by mass is required to obtain the effect, but if it exceeds 8% by mass, the melting point of the molten iron is increased and the fluidity is lowered, which is not preferable for casting work. Nb: 5% by mass or less Nb is also an element effective in forming MC carbides and has an action of concentrating Mo in the carbides. By adding Nb, the carbide becomes tough and the wear resistance of the roll is improved. For that purpose, it is necessary to be 5% by mass or less, and if it exceeds 5% by mass, Nb-based carbides are independently crystallized to promote segregation of the carbides.
【００１３】まず、発明者は、上記組成の溶鉄を遠心鋳
造して製造した耐摩耗性に優れた熱間圧延用ロールの使
用中に、その表面にクラックが発生しないようにするこ
とについて鋭意研究を行った。そして、表面にクラック
が発生しないロールの例として、所謂ニッケル・グレイ
ン鋼からなるものが存在していることに着眼した。その
ロールは、本発明の対象であるハイス系ロールと比べ、
圧延に使用時の表面粗度が粗く、且つ表面には黒鉛が分
散した状態になっている。一般に、焼き付きは、被圧延
材の鋼板とロール表面との接触面積が小さいと起き難く
なることは公知なので、これは表面の粗さと黒鉛の潤滑
作用が影響しているものと考えられた。First, the inventor diligently studied to prevent the generation of cracks on the surface of a hot rolling roll having excellent wear resistance, which is produced by centrifugally casting molten iron having the above composition. I went. Then, as an example of the roll in which no crack is generated on the surface, it was noticed that there is a roll made of so-called nickel-grain steel. The roll is, compared with the high speed steel roll which is the subject of the present invention
The surface roughness when used for rolling is rough, and graphite is dispersed on the surface. It is generally known that seizure is hard to occur when the contact area between the steel plate of the material to be rolled and the roll surface is small, and it is considered that this is influenced by the surface roughness and the lubricating action of graphite.
【００１４】しかしながら、ハイス系ロールは、形成さ
せる炭化物との関係で炭素の添加量に制限があり、黒鉛
を析出させるほどの炭素の添加は望めない。そこで、発
明者は、ロール表面に多数の微小孔を分散させる手段に
ついて、さらに研究を重ねた。その結果、鉄に非固溶な
金属を利用することに想到した。つまり、そのような金
属を前記組成の溶鉄に添加しながら表面に分散させるの
である。このようにすると、製造された後のロールが熱
間圧延で使用中に、鉄に非固溶な金属が蒸発し、そこに
微小孔が形成されるからである。また、その微小孔に
は、種々のガスや水、あるいは潤滑油等が溜まり、それ
らが飛散することで、前記した被圧延材の鋼板とロール
表面との接触面積を小さくし、且つ潤滑作用が働くこと
になる。However, in the high-speed steel roll, the amount of carbon added is limited in relation to the carbide to be formed, and it is not possible to add carbon to the extent that graphite is precipitated. Therefore, the inventor has further studied the means for dispersing a large number of micropores on the roll surface. As a result, they came up with the idea of using a metal that is non-solid solution to iron. That is, such a metal is added to the molten iron of the above composition and dispersed on the surface. This is because, when the roll after being manufactured is used in hot rolling, the metal that is not solid-dissolved in iron is evaporated and micropores are formed therein. Further, various gas, water, lubricating oil, etc. are accumulated in the minute holes, and by scattering them, the contact area between the steel plate of the material to be rolled and the roll surface is reduced, and the lubricating action is Will work.
【００１５】なお、具体的な製造方法については、本発
明では、特に限定しない。鋳掛け肉盛り、遠心鋳造等を
利用すれば良いからである。The specific manufacturing method is not particularly limited in the present invention. This is because it is possible to use overlaying with casting, centrifugal casting, or the like.
【００１６】次に、利用可能な鉄に非固溶な金属として
は、鉛、アンチモン、ビスマス、銀等が考えられたの
で、前記組成の溶鉄に銀を添加して実際にロールを試作
した。ロールの形状及びサイズを図２に示す。このロー
ル１の製造は、予め上記形状及びサイズの鋳型を製作
し、そこに前記組成の溶鉄を注入しつつ、遠心力を加え
ることで行った。つまり、遠心鋳造で製造したのであ
る。なお、鉄に非固溶な金属としての銀は、粒状のもの
を注入される溶鉄流に投入するようにした。主な鋳造条
件を表１に一括して示す。また、銀粒子を添加する場
合、その手段として、１）誘導溶解炉中の攪拌された状
態の鉄浴に添加、２）溶解炉（上記誘導溶解炉）から鍋
に流出する際に添加、３）遠心鋳造を行う場合には、そ
の注入流へ添加するのが良い。銀がロールの外殻に均一
に分散するからである。さらに、添加する銀の形状とし
ては、ａ）粒状（ただし、細粒になるほど添加が難しく
なるし、凝集して添加の意味が失せる）、及び銀メッキ
を施した鉄、又はニッケル粒子であるのが好ましい。Next, as the usable non-solid solution metal for iron, lead, antimony, bismuth, silver, etc. were considered. Therefore, silver was added to the molten iron of the above composition to actually make a trial roll. The shape and size of the roll are shown in FIG. The roll 1 was manufactured by producing a mold having the above-described shape and size in advance, and injecting molten iron having the above composition into the mold, while applying a centrifugal force. In other words, it was manufactured by centrifugal casting. In addition, silver as a non-solid-solution metal in iron was introduced into a molten iron flow into which granular particles were injected. The main casting conditions are collectively shown in Table 1. In addition, when silver particles are added, the means are as follows: 1) addition to a stirred iron bath in an induction melting furnace, 2) addition when flowing out of the melting furnace (the above induction melting furnace) into a pan, 3 ) When centrifugal casting is performed, it is better to add it to the injection flow. This is because silver is uniformly dispersed in the outer shell of the roll. Further, the shape of the silver to be added is a) granular (however, the finer the particles, the more difficult it is to add and the meaning of addition is lost), and silver-plated iron or nickel particles. Is preferred.
【００１７】[0017]
【表１】 [Table 1]
【００１８】試作したロール１の表面近傍の横断面を模
式的に図１に示すが、その外殻層には銀の微小粒子２が
均一に分散されていた。なお、その微小粒子は、外殻層
のみならず、圧延に使用する厚さすべての範囲に分散さ
れていることが必要である。また、該微小粒子２の直径
は、１２〜３２μｍであった。そこで、このロール１で
実際に鋼板の熱間圧延を行ったところ、従来のような焼
き付きは発生せず、表面にクラックの発生も起きなかっ
た。The cross section of the trial roll 1 in the vicinity of the surface is schematically shown in FIG. 1, in which silver fine particles 2 are uniformly dispersed in the outer shell layer. The fine particles need to be dispersed not only in the outer shell layer but also in the entire thickness range used for rolling. The diameter of the fine particles 2 was 12 to 32 μm. Then, when hot rolling of the steel sheet was actually performed with this roll 1, seizure as in the conventional case did not occur and cracks did not occur on the surface.
【００１９】さらに、本発明では、添加する鉄に非固溶
な金属の量は、溶鉄量に対して０．０２〜１．０体積％
であることが好ましい。０．０２体積％未満では、表面
に分散する量が少な過ぎて微小孔が十分に形成されず、
クラックの発生を抑止できない。一方、１．０体積％超
えでは、焼き付き防止効果が飽和し、それ以上の添加は
かえって経済的にマイナスになるからである。また、本
発明では、微小粒子の直径も、１０〜１００μｍの範囲
にあるのが好ましい。１０μｍ未満では、焼き付きの発
生を抑止できないし、１００μｍ超えでは、孔が大き過
ぎて製品の表面品質に悪影響を及ぼすからである。Further, in the present invention, the amount of the non-solid solution metal added to the added iron is 0.02 to 1.0 vol% with respect to the amount of molten iron.
Is preferred. If it is less than 0.02% by volume, the amount dispersed on the surface is too small to form micropores sufficiently,
The generation of cracks cannot be suppressed. On the other hand, if it exceeds 1.0% by volume, the anti-seizure effect is saturated, and the addition of more than that is rather economically negative. Further, in the present invention, the diameter of the fine particles is preferably in the range of 10 to 100 μm. If it is less than 10 μm, the occurrence of image sticking cannot be suppressed, and if it exceeds 100 μm, the pores are too large and the surface quality of the product is adversely affected.
【００２０】[0020]
【実施例】Ｃ：２．６質量％、Ｓｉ：０．８質量％、Ｍ
ｎ：０．７質量％、Ｃｒ：１６質量％，Ｍｏ：４質量
％，Ｖ：５質量％，Ｎｂ：２質量％、残り鉄からなる溶
鉄をを用いて本発明に係る熱間圧延用ロールを多数製造
した。その際、該溶鉄に添加する鉄に非固溶の金属とし
ては、粒径０．５〜１．０ｍｍの銀粒子を選択した。鋳
型は、製造するロールが肉厚８５ｍｍ，直径８１０ｍｍ
になるように統一した。遠心鋳造の条件は、回転数３８
０ｒｐｍ、溶鉄の溶融温度は１５１０℃、鋳込み速度は
１５０ｍｍ／ｍｉｎである。EXAMPLES C: 2.6% by mass, Si: 0.8% by mass, M
n: 0.7% by mass, Cr: 16% by mass, Mo: 4% by mass, V: 5% by mass, Nb: 2% by mass, hot-rolled roll according to the present invention using molten iron composed of residual iron Were manufactured in large numbers. At that time, silver particles having a particle size of 0.5 to 1.0 mm were selected as the non-solid solution metal added to the molten iron. The mold has a roll thickness of 85 mm and a diameter of 810 mm.
Unified to become. The condition for centrifugal casting is 38 rpm.
0 rpm, the melting temperature of molten iron is 1510 ° C., and the casting speed is 150 mm / min.
【００２１】また、本発明で製造したロールと品質を比
較するため、従来の銀を添加しないロールも製造した。
製造したロールは、それぞれ実際の鋼板の熱間圧延に使
用し、その品質を寿命で評価した。その結果を表２に示
す。表２より、本発明に係る圧延ロールの製造方法で製
造したロールの品質は、従来法で製造したものより耐焼
付き性に優れ、前記絞り圧延事故に遭遇した際にロール
表層に発生するクラックが著しく低減された。Further, in order to compare the quality with the roll produced according to the present invention, a conventional roll not added with silver was also produced.
Each of the manufactured rolls was used for actual hot rolling of a steel sheet, and its quality was evaluated by the life. The results are shown in Table 2. From Table 2, the quality of the roll manufactured by the method for manufacturing a rolling roll according to the present invention is superior to the seizure resistance than that manufactured by the conventional method, and the cracks generated on the surface layer of the roll when the rolling accident is encountered are observed. Significantly reduced.
【００２２】[0022]
【表２】 [Table 2]
【００２３】なお、上記実施例は、鋼板の熱間圧延に使
用した例であるが、本発明に係るロールは、鋼以外の非
鉄金属材料（例えば、銅、アルミ等）の熱間圧延に使用
してもかまわない。The above embodiment is an example used for hot rolling of steel sheets, but the roll according to the present invention is used for hot rolling of non-ferrous metal materials other than steel (for example, copper, aluminum, etc.). It doesn't matter.
【００２４】[0024]
【発明の効果】以上述べたように、本発明に係るロール
を使用すれば、熱間圧延中に、ロール表面に分散してい
る多数の鉄に非固溶な金属の微小粒子が揮発し、そこに
微小孔を形成するようになる。その結果、被圧延材とロ
ールとの焼付き頻度が低減し、クラックの発生が従来に
比べて格段と低減し、ロールの寿命が延長できる。つま
り、鋼板の熱間圧延時に、ロールに要する費用が従来よ
り大幅に低減できるようになる。As described above, when the roll according to the present invention is used, during hot rolling, a large number of non-solid-solution metal fine particles dispersed in iron on the roll surface are volatilized, Micropores will be formed there. As a result, the frequency of seizure between the material to be rolled and the roll is reduced, the occurrence of cracks is significantly reduced compared to the conventional case, and the life of the roll can be extended. That is, the cost required for the rolls during hot rolling of the steel sheet can be significantly reduced as compared with the related art.
【図１】本発明に係る熱間圧延用ロールの表面近傍にお
ける銀微粒子の分散状況を模式的に示す図である。FIG. 1 is a diagram schematically showing a dispersion state of silver fine particles in the vicinity of the surface of a hot rolling roll according to the present invention.
【図２】試作したロールの横断面図である。FIG. 2 is a cross-sectional view of a prototype roll.
１ ロール ２ 鉄に非固溶な金属の微粒子 1 roll 2 Fine particles of non-solid solution metal in iron
Claims (6)
量％以下、Ｍｎ：１質量％以下、Ｃｒ：４〜１８質量
％，Ｍｏ：１〜９質量％，Ｖ：３〜８質量％，Ｎｂ：５
質量％以下の鉄で外殻を形成してなるロールであって、 前記鉄に、さらに該鉄に非固溶な金属を含有させ、凝固
後のロール使用層に鉄に非固溶な金属の微粒子を分散さ
せてなることを特徴とする金属材料の熱間圧延用ロー
ル。1. C: 1.6 to 2.9% by mass, Si: 1% by mass or less, Mn: 1% by mass or less, Cr: 4 to 18% by mass, Mo: 1 to 9% by mass, V: 3 ~ 8 mass%, Nb: 5
A roll formed by forming an outer shell with less than or equal to mass% of iron, wherein the iron further contains a metal insoluble in the iron, and the roll-use layer after solidification contains a metal insoluble in iron. A roll for hot rolling of a metal material, characterized in that fine particles are dispersed.
０２〜１．０体積％であることを特徴とする請求項１記
載の金属材料の熱間圧延用ロール。2. The content of the metal insoluble in iron is 0.
The roll for hot rolling of a metal material according to claim 1, wherein the roll is from 02 to 1.0% by volume.
径が１０〜２０μｍであることを特徴とする請求項１又
は２記載の金属材料の熱間圧延用ロール。3. The roll for hot rolling of a metal material according to claim 1, wherein the solidified non-solid solution metal in iron has an average diameter of 10 to 20 μm.
ることを特徴とする請求項１〜３のいずれかに記載の金
属材料の熱間圧延用ロール。4. The roll for hot rolling of a metal material according to claim 1, wherein the non-solid solution metal of iron is silver (Ag).
徴とする請求項１〜４のいずれかに記載の金属材料の熱
間圧延用ロール。5. The roll for hot rolling of a metal material according to claim 1, wherein the metal material is a steel material.
とを特徴とする請求項１〜５のいずれかに記載の金属材
料の熱間圧延用ロール。6. The roll for hot rolling of a metal material according to claim 1, wherein the outer shell is formed by centrifugal casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002116007A JP2003306740A (en) | 2002-04-18 | 2002-04-18 | Roll for hot rolling of metallic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002116007A JP2003306740A (en) | 2002-04-18 | 2002-04-18 | Roll for hot rolling of metallic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003306740A true JP2003306740A (en) | 2003-10-31 |
Family
ID=29397036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002116007A Withdrawn JP2003306740A (en) | 2002-04-18 | 2002-04-18 | Roll for hot rolling of metallic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003306740A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007088555A1 (en) * | 2006-02-01 | 2007-08-09 | Bharat Heavy Electricals Limited | Niobium addition in crmo¼v steel castings for steam turbine casing appliations |
| CN110184524A (en) * | 2019-05-23 | 2019-08-30 | 邢台德龙机械轧辊有限公司 | Improve Nb, V combined microalloying preparation method of high-chromium iron-cast roller wearability and the high-chromium iron-cast roller with high-wearing feature |
-
2002
- 2002-04-18 JP JP2002116007A patent/JP2003306740A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007088555A1 (en) * | 2006-02-01 | 2007-08-09 | Bharat Heavy Electricals Limited | Niobium addition in crmo¼v steel castings for steam turbine casing appliations |
| US7981360B2 (en) | 2006-02-01 | 2011-07-19 | Bharat Heavy Electricals Limited | Niobium addition in Cr-Mo-¼V steel castings for steam turbine casing applications |
| CN110184524A (en) * | 2019-05-23 | 2019-08-30 | 邢台德龙机械轧辊有限公司 | Improve Nb, V combined microalloying preparation method of high-chromium iron-cast roller wearability and the high-chromium iron-cast roller with high-wearing feature |
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