JPS6099408A - Rolling roll made of high chrome cast iron - Google Patents

Rolling roll made of high chrome cast iron

Info

Publication number
JPS6099408A
JPS6099408A JP58205985A JP20598583A JPS6099408A JP S6099408 A JPS6099408 A JP S6099408A JP 58205985 A JP58205985 A JP 58205985A JP 20598583 A JP20598583 A JP 20598583A JP S6099408 A JPS6099408 A JP S6099408A
Authority
JP
Japan
Prior art keywords
cast iron
less
outer layer
roll
inner layer
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
Application number
JP58205985A
Other languages
Japanese (ja)
Other versions
JPS641203B2 (en
Inventor
Munehaya Iiboshi
飯干　宗逸
Hiromichi Saito
斉藤　弘道
Kazuo Kimura
和夫 木村
Mitsuo Hashimoto
光生 橋本
Hiroshi Toyama
外山　弘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP58205985A priority Critical patent/JPS6099408A/en
Priority to US06/932,513 priority patent/US4770194A/en
Priority to PCT/JP1985/000138 priority patent/WO1986005366A1/en
Publication of JPS6099408A publication Critical patent/JPS6099408A/en
Publication of JPS641203B2 publication Critical patent/JPS641203B2/ja
Granted legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/14—Forming reconstituted tobacco products, e.g. wrapper materials, sheets, imitation leaves, rods, cakes; Forms of such products

Landscapes

  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

PURPOSE:To obtain a rolling roll made of high chrome cast iron excellent in wear resisting properties, toughness, and heat cracking characteristics by forming the roll consisting of an outer layer having prescribed hardness and containing the prescribed percentages of C, Si, Mn, Cr, Ni, and Mo and an inner layer having high toughness. CONSTITUTION:A rolling roll made of high chrome cast iron is formed by an outer layer of high chrome cast iron having <=5% (vol%) residual austenite and >=70HS hardness and an inner layer having high toughness. The outer layer contains, by wt%, 3-3.5% C, 0.3-1.2% Si, 0.5-1.5% Mn, 15-27% Cr, 0.5-2% Ni, 0.5-3.5% Mo, and the balance Fe. Further, the inner layer contains, 3-3.6% C, 0.3-1.2% Si, <=0.5% Cr, 0.02-0.1% Mg, one or more kinds of Mn, Ni, and Mo, and the balance Fe.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は高負荷圧延条件に耐える１酎摩耳性、靭性およ
び耐肌荒性を備えた高クロム鋳鉄ロールに関する。この
本発明に係るロールは、ホラＩ・ストリップミルにおけ
る仕」二圧延機用ワークロールおよびコールドストリッ
プミル用ワークロール等に適用される。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a high chromium cast iron roll having abrasion resistance, toughness and roughness resistance that can withstand high load rolling conditions. The roll according to the present invention is applied to a work roll for a second rolling mill in a hollow I/strip mill, a work roll for a cold strip mill, and the like.

（従来技イＩドｊ） 最近の新設ストリップミルは成品板の形状２寸法精度の
飛躍的な品質改善のために、仕」ニスタンドにおける６
Ｈｉ　ミル化や、４Ｈｉ　ミルのクロス化等の新技Ｊ！
ｊが採用されつつある。これらのミルではロール間の面
圧か著しく増加し、局部的に従来ミルの１．５倍以１〕
の接触応力を生じる結果、ワークロールに肌荒を発生１
やすくなる。(Conventional technology) Recently newly installed strip mills are designed to dramatically improve the quality of the two-dimensional precision of the finished plate.
New techniques such as Hi milling and 4Hi milling cross J!
j is being adopted. In these mills, the surface pressure between the rolls increases significantly, and locally it is more than 1.5 times that of conventional mills1]
As a result of contact stress, the surface of the work roll becomes rough1.
It becomes easier.

即ち従来から使用されているアダマイトロールは、高接
触応力下での塑性流動による肌荒や転勤疲労によるスポ
ーリングおよび遊離共晶炭化物ＦｅＣの剥離によるパン
ティングが懸念され、またＮ１グレンロールでは更に黒
鉛の欠は落ち等の損傷により、甚しく作業に支障をきた
すことがしはしばちり、これの解決か望まれていた。In other words, with the Adamite roll that has been used conventionally, there are concerns about roughness due to plastic flow under high contact stress, spalling due to transfer fatigue, and punting due to peeling of free eutectic carbide FeC. Graphite chips often cause damage such as falling off, which seriously hinders work, and a solution to this problem has been desired.

一方、高クロム鋳咥２０−ルはアダマイトロールやＮｉ
　グレンロールに比べて耐摩耗性にすぐれ、ホットスト
リップミル用ワークロールやコールドストリップミル用
ワークロールに用いられ、外層の性能が高く評価されて
いる。しかしながら圧延使用条件によっては熱＃ｉ撃、
熱疲労に起因するロール表面の劣化が認められ、必ずし
も耐肌荒性が十分とはいえない。On the other hand, high chromium casting mouth 20-l is made of adamite roll or Ni.
It has superior wear resistance compared to grain rolls and is used in work rolls for hot strip mills and work rolls for cold strip mills, and the performance of the outer layer is highly evaluated. However, depending on the rolling usage conditions, heat #i attack,
Deterioration of the roll surface due to thermal fatigue was observed, and the roughness resistance was not necessarily sufficient.

（発明の目的） 本発明の目的は、１１ＩＩＩ痒耗性、靭性を保持すると
ともにヒートクラック特性にすぐれ、良Ｍｆな耐肌荒性
を有する高クロム鋳鉄コールを提供することである。(Object of the Invention) An object of the present invention is to provide a high chromium cast iron coal that maintains 11III abrasion resistance and toughness, has excellent heat crack properties, and has good Mf and roughness resistance.

上記の目的のために高クロム鋳鉄コールのｎル荒を調査
、解析の結果、肌荒は熱疲労に伴なう炭化物と基地組織
界面の縦割れ（ロール表面に直角方向の割れ）に始まり
、次いで転勤疲労、熱応力による横割れ（ロール表面に
平行な割れ）の発生。For the above purpose, we investigated and analyzed the roughness of high chromium cast iron rolls, and found that roughness begins with vertical cracking (cracking in the direction perpendicular to the roll surface) at the interface between carbide and matrix structure due to thermal fatigue. Next, transverse cracking (cracking parallel to the roll surface) occurs due to transfer fatigue and thermal stress.

伝播により進行することが明らかになった。このために
高クロム鋳鉄ロール材の榮ＩＭセルサイズの粗大化を抑
制して、不規則に析出する炭化物を微細化することが肌
荒を防止するうえで有効なことを見出した。また、残留
オーステナイトが多量に存在すると熱負荷によって変態
してミクロ的な応力を生じ、肌荒を助長することを見出
した。It has become clear that the disease progresses by propagation. For this reason, it has been found that suppressing the coarsening of the IM cell size of the high chromium cast iron roll material and refining the irregularly precipitated carbides is effective in preventing roughening of the surface. It has also been found that when a large amount of retained austenite is present, it undergoes transformation due to thermal load and generates microscopic stress, which promotes rough skin.

（発明の構成・作用） 本発明の特徴は」−記諸問題を解消するために、残留オ
ーステナイト量を５％以下に規制してＨｓ、硬さ７０以
上を確保し、更に必要に応じて初晶セルサイズを５０ル
ｍ以下の微細な凝固組織を有する高クロムＨ′＃Ｎｒ：
Ｉ−ルを得ることにある。ここに初晶セルサイズとは第
１図に示すように１次デンドライトａまたは２次デンド
ライトｂの大きさである。(Structure and operation of the invention) The characteristics of the present invention are that in order to solve the problems mentioned above, the amount of retained austenite is regulated to 5% or less to ensure Hs and hardness of 70 or more, and if necessary, High chromium H'#Nr with a fine solidified structure with a crystal cell size of 50 lm or less:
The purpose is to obtain an I-le. Here, the primary cell size is the size of the primary dendrite a or the secondary dendrite b, as shown in FIG.

この特徴を満たすために外層成分は、Ｃ：３．Ｑ〜３．
５ＯＡ、　Ｓ　ｉ：　０．３〜１．２％、Ｍｎ：　０．
５〜１．５ｇ、Ｎ１：０．５〜２．０ｘ、Ｃｒ：　１５
〜２７　’Ｘ、　Ｍｏ：　０．５−３．５Ｘ。In order to satisfy this characteristic, the outer layer component is C:3. Q~3.
5OA, Si: 0.3-1.2%, Mn: 0.
5-1.5g, N1: 0.5-2.0x, Cr: 15
~27'X, Mo: 0.5-3.5X.

残部実質的にＦｅからなる鋳鉄、または更に前記成分に
好ましくはＶ：０．１〜１．０％を含有する鋳鉄からな
り、内層成分はＣ：　３．（１〜３．ｆｉ％、Ｓ　ｉ：
　３．０〜３．５ｘ、Ｃｒ：０．５％以下、Ｍｎ、Ｎｉ
、Ｍｏの一種又ハ二ｌａ　以１（７）　合計力２　、５
　％”以下、Ｍｇ：０．０２〜０．１％残部実質的にＦ
ｅからなる鋳鉄の二層で構成される。The remainder consists of cast iron substantially consisting of Fe, or cast iron further preferably containing 0.1 to 1.0% of V in the above components, and the inner layer component is C: 3. (1-3.fi%, Si:
3.0-3.5x, Cr: 0.5% or less, Mn, Ni
, Mo's type or Hani la more than 1 (7) Total power 2, 5
%” or less, Mg: 0.02 to 0.1%, remainder substantially F
It is composed of two layers of cast iron consisting of e.

なお、外層の初晶セルサイズを５０ルｍ以下とする手段
として既述の外層成分とする他に（υ　外層成分として
Ａ交　０．０１〜０，１％添加、１．２ｊ　外層注入後
の溶湯の凝固を迅速に行わせるために金型内面の耐火物
表装厚さが１．５ｍｍ以下の鋳型を用いる。In addition, as a means to reduce the primary cell size of the outer layer to 50 lm or less, in addition to using the outer layer components as described above, (υ A 0.01 to 0.1% addition as an outer layer component, 1.2j after injection of the outer layer) In order to solidify the molten metal quickly, a mold with a refractory coating on the inner surface of the mold having a thickness of 1.5 mm or less is used.

このような舎属組織的な特徴から高クロム鋳鉄ロール材
は、靭性に富みすぐれた転勤疲労性とヒートクランク性
を有し、耐摩耗性とｉｉｌトを肌荒性は飛躍的に向上し
、本発明ロールをホットストリンプ用ワークロールに適
用することで圧延成績の向上か可能である。Due to these structural characteristics, high chromium cast iron roll material has excellent toughness and excellent transfer fatigue resistance and heat crank resistance, and has dramatically improved wear resistance and surface roughness. By applying the roll of the present invention to a work roll for hot stripping, it is possible to improve the rolling performance.

さらにこの高クロムｊ＋　ＳＳロールは冷間におけるｌ
耐ヒートクラツク性と耐摩耗性、削口性を必要とするコ
ールドストリップミル用ワークロールに適用すれば従来
ロールに比べて著しくロール寿命の延長が期待できる。Furthermore, this high chromium J+ SS roll has l
If applied to work rolls for cold strip mills that require heat crack resistance, abrasion resistance, and burrability, the roll life can be expected to be significantly extended compared to conventional rolls.

尚、高クロム鋳鉄材単体でロールを製造する場合、ロー
ル内６Ｂの残留応力が過大となって製造または使用中に
割損の危険性があり、靭性の不足を補うために内層は強
靭な鋳鉄材として複合化する必要がある。In addition, when manufacturing rolls using high chromium cast iron alone, there is a risk that the residual stress in 6B inside the roll will be excessive and it will break during manufacturing or use.In order to compensate for the lack of toughness, the inner layer is made of strong cast iron. It is necessary to make it into a composite material.

以下に本発明の高クロム鋳鉄ロールの外層材の化学成分
の限だ理由を述べる。The reasons for the limitations on the chemical composition of the outer layer material of the high chromium cast iron roll of the present invention will be described below.

Ｃ：　３．０−３．！Ｊ、　Ｃｒ：Ｉ５〜２７％ＣはＣ
ｒとのバランスで決定されるが、３．０％未満では基地
、Ｉ織中にオーステナイトが残留し、さらに凝固過程で
生じる初晶セルサイズが５０ｇｍを越えるために不適で
ある。３．０％以上では共晶組織に近くなり、初晶セル
サイズが５０ｇｍの微細凝固組織が得られるために耐肌
荒性が改善されるとともに、炭化物量の増加によってＨ
ｓ７０以」二の硬さの確保が容易である。３．５′／ａ
を超えると炭化物惜が増大し、靭性が劣化するとともに
炭化物の周辺のオーステナイトの残留量が急激に増加す
る。さらに製造過程でのロール割損の危険性が高くなる
。C: 3.0-3. ! J, Cr:I5~27%C is C
It is determined based on the balance with r, but if it is less than 3.0%, austenite will remain in the matrix and I-weave, and furthermore, the primary cell size generated in the solidification process will exceed 50 gm, which is unsuitable. At 3.0% or more, the structure becomes close to a eutectic structure, and a fine solidified structure with a primary cell size of 50 gm is obtained, improving skin roughness resistance, and increasing the amount of carbides.
It is easy to ensure a hardness of s70 or higher. 3.5'/a
If it exceeds this, the amount of carbides increases, the toughness deteriorates, and the amount of austenite remaining around the carbides increases rapidly. Furthermore, the risk of roll breakage during the manufacturing process increases.

よってＣ含有液は３．０〜３．５％とする。Therefore, the C-containing liquid should be 3.0 to 3.5%.

Ｃｒは１．５％未満では比較的硬さの低い共晶炭化物（
Ｆ　ｅ　−Ｃｒ　）ａ’Ｃを混在するために好ましくな
く、また２７％を超えて添加すると粗大なりロム炭化物
を析出し、炭化物の分４ｊが不均一となって好ましくな
い。従ってＣｒ含有量は硬質クロム炭化物（Ｆ　ｅ　−
Ｃｒ　）？　Ｃ３が均一に分ｔｉ’ｌ析出して、耐庁耳
性と靭性に最もすぐれた特性を有する１５〜２７％の範
囲とする。If Cr is less than 1.5%, eutectic carbide (
It is not preferable because F e -Cr )a'C is mixed therein, and if it is added in an amount exceeding 27%, it becomes coarse and precipitates romium carbide, and the carbide content 4j becomes non-uniform, which is not preferable. Therefore, the Cr content is determined by hard chromium carbide (Fe −
Cr)? C3 is uniformly precipitated in a proportion of 15 to 27%, and has the best properties in terms of resistance to cracking and toughness.

Ｍｏ二〇、５〜３．５ＬＶ：０．１−］、０％ＣＱおよ
びＣｒ量が多くなると、硬質クロム炭化物（Ｆｅ−Ｃｒ
）７Ｃ３の析出量が増加して摩耗量軽減のうえで有利と
なる反面、基地組織中の残留オーステナイトが増加する
。そのためこれらの残留オーステナイトｔｌ！を減少さ
せほっ、クロム炭化物よりも硬質な炭化物を析出させる
ために、Ｍｏ、　もしくはＭｏ　とＶを添加する。Ｍｏ
は硬質炭化物Ｍｏ２Ｃ形成による析出硬化を促進して基
地硬さを高め耐摩耗性を向上させるほかに、焼入。Mo20, 5-3.5LV: 0.1-], 0% When the amount of CQ and Cr increases, hard chromium carbide (Fe-Cr
) The amount of 7C3 precipitated increases, which is advantageous in reducing the amount of wear, but on the other hand, retained austenite in the matrix structure increases. Therefore, these retained austenite tl! Mo or Mo and V are added to reduce the chromium carbide and precipitate a carbide that is harder than the chromium carbide. Mo
In addition to promoting precipitation hardening due to the formation of hard carbide Mo2C, increasing base hardness and improving wear resistance, quenching.

焼戻特性を大ｒｉに改善する。Ｈｓ？０以上のロール硬
さを得るために、Ｍｏは０．５％以上が必要であり、Ｈ
ｓ硬さ９０以上の硬さが要求されるコールドミルワーク
ロールの場合ＭＯは３．５％で十分である。Greatly improves tempering properties. Hs? In order to obtain a roll hardness of 0 or more, Mo needs to be 0.5% or more, and H
In the case of cold millwork rolls that require a hardness of s hardness of 90 or more, an MO content of 3.5% is sufficient.

又、必要に応じ添加されるＶは、０．Ｉ′Ｘ以１−でＶ
Ｃ炭化物を析出してオーステナイトが減少するために１
Ｉｌ１４席耗性は改善される。１％以上の添加によって
も残留オーステナイト量の減少効果は小さい。従って経
済性も考慮して■の北限は１％とする。Further, V added as necessary is 0. V at 1- from I'X
1 to precipitate C carbides and reduce austenite.
Il14 wear resistance is improved. Even if it is added in an amount of 1% or more, the effect of reducing the amount of retained austenite is small. Therefore, considering economic efficiency, the northern limit of ■ is set at 1%.

Ｎｉ：　０．５−２．０％ Ｎ１は基地組織を強化し、Ｈｓ硬さ７０以上の所要硬さ
を得るために０．５％以−１−がμ・背であり、２ｚを
超えて添加するとオー・ステナイトが安定化して残６ｒ
Ｈオーステナイト量を５ｚ以下に下げるために長１１ｊ
″間の熱処理を要する。このために経済性も考ｊ、市し
て北限を２ｚに限定する。Ni: 0.5-2.0% N1 strengthens the base structure, and in order to obtain the required hardness of Hs hardness 70 or more, 0.5% or more -1- is μ・back, and more than 2z When added, austenite is stabilized and the remaining 6r
Long 11j to lower the amount of H austenite to 5z or less
It requires heat treatment for a period of 30 minutes.For this reason, considering economic efficiency, we decided to limit the northern limit to 2z.

Ｓ　ｉ：　０．３−１．２°’／Ａ　、　Ｍ　ｎ：　０
．５〜１．５％Ｓ１は溶湯の脱酸のために０．３ｚ以−
］二必要であるか、これか高くなると機械的性質が劣化
するために北限を１．２％とする。又、Ｍｎは溶湯の脱
酸作用のほかにＳと結合して熱間での機械的性質の劣化
を防止するが、その効果は０．５％未満では十分でなく
、１．５％を超えると靭性を低下する。よってＭｎ含有
量は０．５〜１．５１とする。Si: 0.3-1.2°'/A, Mn: 0
．． 5-1.5% S1 is 0.3z or more for deoxidizing the molten metal.
] The northern limit is set at 1.2%, since the mechanical properties deteriorate if it becomes too high. In addition to deoxidizing the molten metal, Mn also combines with S to prevent deterioration of mechanical properties during hot temperatures, but this effect is not sufficient when it is less than 0.5%, and when it exceeds 1.5%. and decrease toughness. Therefore, the Mn content is set to 0.5 to 1.51.

次に本発明の内層を化学成分の限定理由を述べる。Next, the reasons for limiting the chemical components of the inner layer of the present invention will be described.

Ｃ：３．０〜３．８％ 内層は外層の成分特にＣｒの拡散によって黒鉛化か阻害
され、本発明の高クロムｔ４ｊ鉄ロールにおいて３％未
満のＣでは黒鉛化が不十分となり、軸部の靭性が低下す
る。Ｃが３．６％を超えると黒鉛が過剰となって軸部の
強度が低下する。よってＣ含有量は３．０〜３．６％と
する。C: 3.0 to 3.8% Graphitization of the inner layer is inhibited by the diffusion of the components of the outer layer, especially Cr, and in the high chromium T4J iron roll of the present invention, graphitization of less than 3% will result in insufficient graphitization of the shaft. toughness decreases. When C exceeds 3.6%, graphite becomes excessive and the strength of the shaft portion decreases. Therefore, the C content is set to 3.0 to 3.6%.

Ｓｉ＋３．０〜３．５％ Ｓｉ　は外層のＣｒの拡故による内層材質の劣化を防止
するために３ｚ以−４−が必要であるが、３．５％を超
えると黒鉛か過剰となって材質が劣化する。Si + 3.0 to 3.5% Si requires 3z or more -4- to prevent deterioration of the inner layer material due to the spread of Cr in the outer layer, but if it exceeds 3.5%, graphite becomes excessive. The material deteriorates.

よってＳｉ含有量は３．０〜３．５ｚとする。Therefore, the Si content is set to 3.0 to 3.5z.

Ｃｒ：０．５Ｘ以下（凝固時１．８％以下）外層からの
拡散によって内層のＣｒが高くなると、内層の白銑化に
よって靭性か劣化し、ロール内部に生しる残留応力の増
加に件なって割損する。本発明において凝固時の内層Ｃ
ｒの許容量は１．８％以下とする惑星があり、このため
に内層の注入条件にもよるが内層溶湯時のＣ「を０．５
％以下とする。Cr: 0.5X or less (1.8% or less when solidified) When the Cr content in the inner layer increases due to diffusion from the outer layer, the toughness deteriorates due to whitening of the inner layer, resulting in an increase in residual stress generated inside the roll. This results in a loss. In the present invention, the inner layer C during solidification
There are some planets where the allowable amount of r is 1.8% or less, and for this reason, the C' in the inner layer molten metal is set to 0.5%, although it depends on the injection conditions of the inner layer.
% or less.

ｒＶｉｇ＋０．０２〜０．１％ Ｍｇは球状化のために盛装な元素であるか、ｏ、ｏ２ｘ
未満では球状化不良を来たし、軸部の強靭化ができない
。′しかしＭｇが０．１％を超えて含イ４されると、Ｍ
ｇのチル化作用およびドロス生成の点で弊害を生じる。rVig+0.02~0.1% Is Mg an important element for spheroidization, o, o2x
If it is less than that, the spheroidization will be poor and the shaft portion will not be strong enough. 'However, when Mg is included in excess of 0.1%, Mg
This causes harmful effects in terms of the chilling effect of g and the formation of dross.

よってＭｇの含有量は０．０２〜０．１％の範囲とする
。Therefore, the content of Mg is set in the range of 0.02 to 0.1%.

その他内層鋳鉄材を構成する合金元素として、Ｍｎ、Ｎ
ｉ、Ｍｏの一種または二種以上を内層の強度をイ・４与
する目的で合計２，５ｚの範囲内で添加する。Other alloying elements constituting the inner layer cast iron material include Mn, N
One or more types of i and Mo are added in a total amount of 2.5z for the purpose of imparting strength to the inner layer.

含有量の合計が２．５χを超えると内層か硬化して靭性
が低ト′するために不適である。If the total content exceeds 2.5χ, the inner layer will harden and the toughness will decrease, which is unsuitable.

次に、外層材の残留オーステナイト５％以下および初晶
セルサイス５０ｐＬｍ以下の限定理由をその効果につい
て示す。第２図は残留オーステナイト量と圧延使用後の
肌評価の関係を示した。この［Δから明らかなように残
留オーステナイト量を５％以下に抑制することで、ロー
ル肌は安定し１■ｊ使用が可能である。第３図は初晶セ
ルサイズと熱衝撃クラック深さの関係を示した。初晶セ
ルサイスが小さくなるにつれて最大クラック深さは減少
し、熱衝撃特性の改善が顕著である。従って初晶セルサ
イズは、実ロール製造ｒｉｆ能な５０ｇｍ以下とするこ
とが好ましく、これを実機ミルに適用することでさらに
すぐれた耐肌荒刊が十分期待される。Next, the reasons for limiting the outer layer material to 5% or less retained austenite and 50 pLm or less primary cell size will be explained with regard to their effects. Figure 2 shows the relationship between the amount of retained austenite and the skin evaluation after rolling. As is clear from this [Δ, by suppressing the amount of retained austenite to 5% or less, the roll skin is stabilized and 1■j use is possible. Figure 3 shows the relationship between primary cell size and thermal shock crack depth. As the primary cell size decreases, the maximum crack depth decreases, and the thermal shock properties are significantly improved. Therefore, it is preferable that the primary cell size is 50 gm or less, which is suitable for actual roll production, and by applying this to an actual mill, it is fully expected that even more excellent roughness resistance will be achieved.

（発明の効果） 本発明の高クロム鋳鉄ロールは、外層および内層の成分
範囲を以」−のように限定することによって、耐摩耗性
、靭性を有し且つ耐ヒーｉ・クランク性、關肌荒性にす
ぐれ特に高負荷圧延に耐え得る性質を化グーし得たもの
である。(Effects of the Invention) The high chromium cast iron roll of the present invention has wear resistance, toughness, heat resistance, crankability, and surface resistance by limiting the range of ingredients in the outer layer and inner layer as follows. It has excellent roughness and can withstand particularly high load rolling.

本発明ロールは遠心鋳造なとの複合鋳造法で二層の鋳塊
を形成後、　４００〜ｂｉｏｏ°Ｃでの反復焼戻または
Ａ、点以上からの焼入と　４００〜６００℃での焼戻に
よって製造される。The roll of the present invention is manufactured by forming a two-layer ingot using a combined casting method including centrifugal casting, followed by repeated tempering at 400 to bioo°C or quenching from point A or above and tempering at 400 to 600°C. Manufactured by.

（実施例） 製品胴径？７５ｍｍ、製品胴長１．７５０ｍｍ、全長５
，１７５ｍｍのホットストリップミル用ワークロールを
製造し、第１表に示すような成分および材質特性を有す
る健全な高クロム鋳鉄ロールを得ることができた。この
ロールを実機圧延に供した結果摩耗、肌荒、折損等の事
故はなく、良好な圧延成績を収めた。(Example) Product body diameter? 75mm, product trunk length 1.750mm, total length 5
, 175 mm work rolls for hot strip mills were manufactured, and sound high chromium cast iron rolls having the components and material properties shown in Table 1 were obtained. When this roll was subjected to rolling on an actual machine, there were no accidents such as wear, roughness, or breakage, and good rolling results were obtained.

【図面の簡単な説明】[Brief explanation of the drawing]

ｉ、６１図は初晶セルサイズの大きさを示すプントライ
（・の説明図、第２１Δは残留オーステナイト量と実機
ロールの肌評点の図、第３図は初晶セルサイスと熱衝敷
最犬りラック深さを示す図である。 特許出願人　代理人 ブｉ゛理十　矢　葺　知　之 （ほか１名） 第１＾ 第２図 り茨・留Ａ′−スＴナイト（％） 手糸光祁ｊ正書（自発） 昭和５８年１２月２日 特許庁長官若杉和夫殿 ■、事件の表示 昭和５８年特許願第２０５９８５号 ２、発明の名称 高クロム鋳鉄圧延ロール ３、補正をする者 用件との関係　出願人 住所　東京都千代田区大手町二丁目６番３号名称　（６
６５）新日本製鐵株式会社 ４、代　理　人 住所　東京都港区赤坂６丁目４番２１号７０４置　（５
８４）　７０２２ ５、補正の対象 明細書の特許請求の範囲および発明の詳細な説明の欄 ６、補正の内容 （１）明細書第１〜２頁の特許請求の範囲の記載を別紙
の通り訂正する。 （２）明細書第３頁１６行のｒＦｅ　Ｃ」をｒＦｅ、Ｃ
」と訂正する。 ２、特許請求の範囲 （１）重量比で Ｃ：　３．０〜３．５Ｘ　、Ｓ　ｉ：　０．３〜１．２
％Ｍｎ：０．５〜１．５Ｘ、Ｃｒ：１５−２７％Ｎ　ｉ
：　０．５〜２．０％、ｌ’ｖｌｏ：　０．５〜３．５
％残部実質的にＦｅからなり、体積比で残留オーステナ
イト量が５ｚ以下でかつＨｓ硬さ７０以上を有する高ク
ロム鋳鉄の外層と、 重量比で Ｃ：　３．０−３．６％、Ｓ　ｉ：　０．３〜１．２Ｘ
Ｃｒ：０．５％以下、Ｍｇ＋０．０２〜０．１％Ｍｎ、
Ｎｉ、Ｍｏの一種又は二種以上を２．５′１０以下残以
下質的にＦｅかうなる内層と、 から成ることを特徴とする高クロム鋳鉄圧延ロール。 （２）重量比で Ｃ：　３．０〜３．５％　、　Ｓ　ｉ：　Ｌｌ、３〜１
．２ＸＭｎ：　０．５〜１．５％、　Ｃｒ：　１５　〜
２７　！Ｎ　ｉ：　０．５〜２．０％　、　Ｍｏ：　０
．５〜３．５ＸＶ：０．１〜１．０％ 残部実質的にＦｅからなり、圧積比で残留オーステナイ
ト量が５％以下でかつＨｓ硬さ７０以上を有する高クロ
ム鋳鉄の外層と、 重量比で Ｃ：　３．０〜３．６％、Ｓ　ｉ：　０．３〜１．２％
Ｃｒ：０．５％以下、Ｍｇ＋０．０２〜０．１％Ｍｎ、
Ｎｉ、Ｍｏの一種又は二種以上を２，５ｚ以以下部実質
的にＦｅからなる内層と、 から成ることを特徴とする高クロム鋳鉄圧延ロール。 （３〕外層の初晶セルサイズか５０ｐｍ以下の微細緻密
な凝固組織を有することよりなる特許請求の範囲第１項
又は第２項記載の圧延ロール。i, Figure 61 is an explanatory diagram of Puntrai (・) showing the size of the primary crystal cell size, No. 21Δ is a diagram of the amount of retained austenite and the skin score of the actual roll, and Figure 3 is the illustration of the primary crystal cell size and thermal shock strength. It is a diagram showing the rack depth. Patent applicant Agent B. Ritoya Fuki Tomoyuki (and 1 other person) 1st^ 2nd design Ibara/Tome A'-su T night (%) Mitsuyuki Teito j Author (spontaneous) December 2, 1980 Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office ■, Indication of the case 1982 Patent Application No. 205985 2, Name of the invention High chromium cast iron rolling roll 3, Matters of the person making the amendment Relationship with Applicant Address: 2-6-3 Otemachi, Chiyoda-ku, Tokyo Name (6
65) Nippon Steel Corporation 4, Agent Address: 704, 6-4-21 Akasaka, Minato-ku, Tokyo (5)
84) 7022 5. Claims and Detailed Description of the Invention column 6 of the specification to be amended, Contents of the amendment (1) The statement of the claims on pages 1 to 2 of the specification is corrected as shown in the attached sheet. do. (2) "rFe C" on page 3, line 16 of the specification is rFe, C
” he corrected. 2. Claims (1) Weight ratio: C: 3.0 to 3.5X, Si: 0.3 to 1.2
%Mn: 0.5-1.5X, Cr: 15-27% Ni
: 0.5-2.0%, l'vlo: 0.5-3.5
An outer layer of high chromium cast iron having a residual austenite content of 5z or less by volume and a Hs hardness of 70 or more; C: 3.0-3.6% by weight, Si : 0.3~1.2X
Cr: 0.5% or less, Mg + 0.02 to 0.1% Mn,
A high chromium cast iron rolling roll comprising: an inner layer containing one or more of Ni and Mo with a balance of 2.5'10 or less and a qualitatively Fe content. (2) Weight ratio: C: 3.0-3.5%, Si: Ll, 3-1
．． 2XMn: 0.5~1.5%, Cr: 15~
27! Ni: 0.5-2.0%, Mo: 0
．． 5 to 3.5 C: 3.0-3.6%, Si: 0.3-1.2%
Cr: 0.5% or less, Mg + 0.02 to 0.1% Mn,
A high chromium cast iron rolling roll comprising one or more of Ni and Mo, and an inner layer consisting essentially of Fe at 2.5z or less. (3) The rolling roll according to claim 1 or 2, wherein the rolling roll has a fine and dense solidified structure with a primary cell size of 50 pm or less in the outer layer.

Claims (3)

【特許請求の範囲】[Claims] （１）重、Ｉｉ比で Ｃ：　３．０〜３．５Ｚ、Ｓ　ｉ：　０．３〜１．２％
Ｍ　ｎ−０，５〜　１．５％　、　Ｃｒ：　１５　〜２
７　％Ｎｉ　二　０．５〜２．０％、　Ｍｏ：　０．５
〜３．５２残部実質的にＦｅかうなり、１ｎｉＪ六１し
で残留オーステナイト量が５％以下でかつＨｓ硬さ７０
以−１１を有する高クロム鋳鉄の外層と、 ｇｒ、量比で Ｃ３０〜３．６％、Ｓｌ：（１，３〜１．２％Ｃｒ：　
０．５％　以下、Ｍｇ：０．０２−０．１％Ｍｎ、Ｎｉ
、Ｍｏの一種又Ｃま−０種以」二を２，５％以−ド残部
実質的にＦｅからなる内層と、 から成ることを特徴とする高クロム鋳鉄ｊ王延ロール。(1) Weight, Ii ratio: C: 3.0-3.5Z, Si: 0.3-1.2%
Mn-0.5~1.5%, Cr: 15~2
7% Ni 0.5-2.0%, Mo: 0.5
~3.52 The balance is substantially Fe, 1niJ61, the amount of retained austenite is 5% or less, and the Hs hardness is 70
An outer layer of high chromium cast iron having the following: gr, quantitative ratio of C30 to 3.6%, Sl: (1.3 to 1.2% Cr:
0.5% or less, Mg: 0.02-0.1%Mn, Ni
, an inner layer consisting of 2.5% or more of one kind of Mo, or one of C, zero or more, and the balance substantially consisting of Fe. （２）重４ｉ比て Ｃ：　３．０−３．５％、　Ｓ　ｉ：　０．３〜１．２
ＸＭｎ：　０−５〜１．５％　＋　Ｃｒ：　１５　〜２
７　ＸＮ　ｉ：　０．５〜２．０％　、　Ｍｏ：　０．
５〜３．５％Ｖ：　０．１−１．０％ 残部実質的にＦｅかもなり１面積比で残留オーステナイ
ト賛が５％以−トでかつＨｓ硬さ７０以上を７１３する
高クロム鋳鉄の外層と、 重量比で Ｃ：、　３．Ｑ〜３，８％、Ｓｉ：０．３〜１．２％Ｃ
ｒ：０．５％以下、Ｍｇ：０．０２−０．ｌＸＭｎ、Ｎ
ｉ、Ｍｏの一種又は二種以上を２．５ｚ以下残部実質的
にＦｅからなる内層と、 から成ることを特徴とする高クロム銃鉄圧延ロール。(2) Weight 4i ratio: C: 3.0-3.5%, Si: 0.3-1.2
XMn: 0-5~1.5% + Cr: 15~2
7XN i: 0.5-2.0%, Mo: 0.
5 to 3.5% V: 0.1 to 1.0% The remainder may be substantially Fe. High chromium cast iron with retained austenite content of 5% or more per area ratio and Hs hardness of 70 or more at 713. Outer layer: C by weight ratio: 3. Q~3.8%, Si:0.3~1.2%C
r: 0.5% or less, Mg: 0.02-0. lXMn,N
1. A high chromium iron rolling roll comprising one or more of Mo, 2.5z or less, and an inner layer consisting essentially of Fe. （３）外層の初晶セルサイズが５０ｐｍ以下の微細緻密
な凝固組織をイｊすることよりなる＃Ｊｊ許請求の範囲
第１項又は第２づ１〜戦の圧延ロール。(3) A rolling roll according to claim 1 or 2, which is formed by forming a fine and dense solidified structure in which the outer layer has a primary cell size of 50 pm or less.
JP58205985A 1983-09-26 1983-11-04 Rolling roll made of high chrome cast iron Granted JPS6099408A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP58205985A JPS6099408A (en) 1983-11-04 1983-11-04 Rolling roll made of high chrome cast iron
US06/932,513 US4770194A (en) 1983-09-26 1985-03-22 Method of manufacturing wrinkled sheet tobacco
PCT/JP1985/000138 WO1986005366A1 (en) 1983-09-26 1985-03-22 Process for manufacturing wrinkled sheet tobacco

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58205985A JPS6099408A (en) 1983-11-04 1983-11-04 Rolling roll made of high chrome cast iron

Publications (2)

Publication Number Publication Date
JPS6099408A true JPS6099408A (en) 1985-06-03
JPS641203B2 JPS641203B2 (en) 1989-01-10

Family

ID=16515983

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58205985A Granted JPS6099408A (en) 1983-09-26 1983-11-04 Rolling roll made of high chrome cast iron

Country Status (1)

Country Link
JP (1) JPS6099408A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6228012A (en) * 1985-07-30 1987-02-06 Kawasaki Steel Corp Roll for scale breaker
US4771524A (en) * 1986-02-14 1988-09-20 Sulzer Brothers Limited Roll having a hard envelope surface
US5070587A (en) * 1989-08-17 1991-12-10 Tocalo Co., Ltd. Roll for use in heat treating furnace and method of producing the same
JP2009214122A (en) * 2008-03-07 2009-09-24 Fujico Co Ltd Composite roll for hot rolling and its manufacturing method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57134539A (en) * 1981-02-13 1982-08-19 Kubota Ltd High chromium work roll
JPS5855549A (en) * 1981-09-29 1983-04-01 Kubota Ltd Composite sleeve roll for rolling h-steel and preparation thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57134539A (en) * 1981-02-13 1982-08-19 Kubota Ltd High chromium work roll
JPS5855549A (en) * 1981-09-29 1983-04-01 Kubota Ltd Composite sleeve roll for rolling h-steel and preparation thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6228012A (en) * 1985-07-30 1987-02-06 Kawasaki Steel Corp Roll for scale breaker
US4771524A (en) * 1986-02-14 1988-09-20 Sulzer Brothers Limited Roll having a hard envelope surface
US5070587A (en) * 1989-08-17 1991-12-10 Tocalo Co., Ltd. Roll for use in heat treating furnace and method of producing the same
JP2009214122A (en) * 2008-03-07 2009-09-24 Fujico Co Ltd Composite roll for hot rolling and its manufacturing method

Also Published As

Publication number Publication date
JPS641203B2 (en) 1989-01-10

Similar Documents

Publication Publication Date Title
JPS6126754A (en) Double-layered cylinder liner having superior wear resistance
JPH0873977A (en) Production of outer layer material for roll for hot rolling and roll for hot rolling
JPS6099408A (en) Rolling roll made of high chrome cast iron
JPH062904B2 (en) High strength low alloy steel Extra thick steel manufacturing method
US2416515A (en) High temperature alloy steel and articles made therefrom
JPS61177355A (en) Outer layer material of composite roll for rolling
JPH021208B2 (en)
JPH02285047A (en) Roll for hot rolling
JPH0426739A (en) Steel for hot tube manufacturing tool and hot tube manufacturing tool thereof
JPH08325673A (en) Composite roll for rolling excellent in wear resistance, surface roughening resistance and the like
JP2953304B2 (en) Roll outer tube material for continuous sheet casting machine
JP2004162104A (en) Roll external layer material for hot rolling and composite roll for hot rolling
JPH0353042A (en) Roll for rolling
JPH06122937A (en) Wear-resistant composite roll excellent in crack propagating resistance
JP2795557B2 (en) Composite roll
JPH03281753A (en) High alloy cast iron material having excellent resistance to roughening of surface
JP3482349B2 (en) Hot working tool materials
JP3243257B2 (en) Composite roll
JP3530379B2 (en) Work roll for cold rolling
JPH0999306A (en) Roll for hot rolling
JPS60121013A (en) Composite roll for strip mill
JPH0426738A (en) Steel for hot tube manufacturing tool and hot tube manufacturing tool thereof
WO2000051756A1 (en) Roll for rolling
JPS6223964A (en) Material for outer layer of composition roll for rolling
JPS6023183B2 (en) Rolling roll with excellent toughness and wear resistance