JPH0643602B2 - Method of manufacturing work roll for cold rolling - Google Patents
Method of manufacturing work roll for cold rollingInfo
- Publication number
- JPH0643602B2 JPH0643602B2 JP60298541A JP29854185A JPH0643602B2 JP H0643602 B2 JPH0643602 B2 JP H0643602B2 JP 60298541 A JP60298541 A JP 60298541A JP 29854185 A JP29854185 A JP 29854185A JP H0643602 B2 JPH0643602 B2 JP H0643602B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- roll
- work roll
- cold rolling
- heat treatment
- 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.)
- Expired - Lifetime
Links
- 238000005097 cold rolling Methods 0.000 title claims description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000005496 tempering Methods 0.000 claims description 25
- 239000011162 core material Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 20
- 239000011257 shell material Substances 0.000 claims description 20
- 239000002131 composite material Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 17
- 230000006698 induction Effects 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 238000010791 quenching Methods 0.000 claims description 13
- 230000000171 quenching effect Effects 0.000 claims description 13
- 239000010410 layer Substances 0.000 claims description 11
- 229910001315 Tool steel Inorganic materials 0.000 claims description 10
- 239000002775 capsule Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 7
- 230000009466 transformation Effects 0.000 claims description 7
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 6
- 238000001513 hot isostatic pressing Methods 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 2
- 230000003746 surface roughness Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 34
- 238000012360 testing method Methods 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 6
- 238000007788 roughening Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 229910000997 High-speed steel Inorganic materials 0.000 description 2
- 101000803685 Homo sapiens Vacuolar protein sorting-associated protein 4A Proteins 0.000 description 2
- 101000803689 Homo sapiens Vacuolar protein sorting-associated protein 4B Proteins 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 102100035085 Vacuolar protein sorting-associated protein 4A Human genes 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 etc.) Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は冷間圧延用ワークロールの製造に係り、より詳
細には、外殻材が粉末焼結層からなる複合型の冷間圧延
用ワークロールの製造方法に関する。Description: TECHNICAL FIELD The present invention relates to the production of work rolls for cold rolling, and more particularly, to the composite cold rolling in which the outer shell material is a powder sintered layer. The present invention relates to a work roll manufacturing method.
（従来の技術） 冷間圧延用ワークロールは表面性状が良好な薄鋼板乃至
鋼帯を高能率で製造するために高硬度で、かつ、優れた
耐摩耗性、耐事故性、耐肌荒性等を具備する必要があ
る。(Prior art) Work rolls for cold rolling have high hardness to produce thin steel plates or strips with good surface properties with high efficiency, and also have excellent wear resistance, accident resistance, and rough surface resistance. And so on.
従来、圧延用ロールを製造する方法としては、通常、鋳
造若しくは鍛造による一体型で所要の熱処理により所望
の特性を付与する方法が採用されているが、最近、表層
部に粉末焼結層を形成した複合型のロールとして製造す
る方法が注目されている。Conventionally, as a method of manufacturing a rolling roll, a method of imparting desired properties by a required heat treatment in an integrated type by casting or forging is usually adopted, but recently, a powder sintered layer is formed on a surface layer portion. A method for producing the composite type roll has attracted attention.
後者の製造方法としては、例えば、特開昭４７−２８５
１号公報に開示されているように、ＳＩＳ１５５０、Ｓ
ＩＳ１６５０、ＳＩＳ２２４４、ＳＩＳ２５４１又はハ
ッドフィールドのマンガン鋼からなるロール軸芯材の周
囲に環状空間を形成するべく金属カプセルを取付け、そ
の環状空間内に高速度鋼若しくは硬質金属からなる粉末
を充填して外殻層とした後、高温高圧ガス雰囲気下で熱
間静水圧プレス処理することにより、前記ロール軸芯材
と外殻層を一体化して複合ロールを得、その後、熱処理
として焼入れ焼戻し処理を施すという方法が知られてい
る。Examples of the latter manufacturing method include, for example, JP-A-47-285.
As disclosed in Japanese Patent Laid-Open No.
Attach a metal capsule to form an annular space around the roll shaft core made of IS1650, SIS2244, SIS2541, or Hadfield manganese steel, and fill the annular space with powder made of high-speed steel or hard metal After forming the shell layer, by hot isostatic pressing in a high-temperature high-pressure gas atmosphere, the roll core material and the outer shell layer are integrated to obtain a composite roll, and then quenching and tempering treatment is performed as heat treatment. The method is known.
（発明が解決しようとする問題点） しかし、この製造方法は、粉末冶金的手段によって複合
構造のロール素材を製造する点に主眼をおいており、一
般に圧延ロール、特に複合ロールにおいてかなり重要と
考えられている熱処理については、単に焼入れ焼戻しを
実施するということを言及しているにすぎず、その具体
的条件については全く明らかにされていない。(Problems to be Solved by the Invention) However, this manufacturing method focuses on manufacturing a roll material having a composite structure by a powder metallurgical means, and is considered to be quite important for a rolling roll in general, and a composite roll in particular. With respect to the heat treatment, it merely refers to carrying out quenching and tempering, and the specific conditions thereof are not clarified at all.
この程度の製造技術では、圧延用ロール素材を製造する
ことはできても、高硬度で、かつ、優れた耐摩耗性、耐
事故性、耐肌荒性等が要求される冷間圧延用のワークロ
ールを製造することはできない。With this level of manufacturing technology, it is possible to manufacture rolling materials for rolling, but for cold rolling where high hardness and excellent wear resistance, accident resistance, surface roughening resistance, etc. are required. It is not possible to manufacture work rolls.
本発明は、圧延ロールの製造に関する上記従来技術をベ
ースとし、更に冷間圧延用ワークロールとして必要な特
性である高硬度で、かつ、優れた耐摩耗性、耐事故性及
び耐肌荒性を備えた複合ロールを安価に製造する方法を
提供することを目的とするものである。The present invention is based on the above-mentioned conventional technology relating to the production of rolling rolls, and further has a high hardness which is a characteristic required as a work roll for cold rolling, and has excellent wear resistance, accident resistance and rough skin resistance. An object of the present invention is to provide a method for inexpensively manufacturing the provided composite roll.
（問題点を解決するための手段） 上記目的を達成するため、本発明者は、粉末冶金的手段
を用いて複合ロールを製造する上記従来技術を改良して
冷間圧延用ワークロールの製造法として確立するべく鋭
意研究を重ねた結果、ロール軸芯材及び外殻材の材質乃
至成分を特定して必要な表面硬度を得、更にこの種のロ
ールとして重要な熱処理として、焼入れ手段及び条件を
特定すると共に特定温度にて少なくとも２回以上の焼戻
し処理を施すという熱処理法を適用することにより、は
じめて可能であることを見い出した。また上記処理の前
処理として調質処理を施すことにより、複合ロールの境
界部の疲労特性が向上することも判明した。(Means for Solving the Problems) In order to achieve the above object, the present inventor has improved the above-mentioned conventional technique of manufacturing a composite roll using a powder metallurgical means to improve the method of manufacturing a work roll for cold rolling. As a result of repeated intensive research to establish the required surface hardness by specifying the materials and components of the roll shaft core material and outer shell material, further, as an important heat treatment for this type of roll, the quenching means and conditions are set. It has been found that this is possible for the first time by applying a heat treatment method of specifying and tempering at least twice at a specific temperature. It was also found that the fatigue property of the boundary portion of the composite roll was improved by performing the heat treatment as the pretreatment of the above treatment.
すなわち、本発明の要旨とするところは、低合金鋼から
なるロール軸芯材の周囲に環状空間を形成するように金
属カプセルを設け、該環状空間内に重量割合でＣ:１．
５〜３．０％とＣr:１４．０〜２５．０％と、更にＭo
及び／又はＶが合計で１．５〜６．０％とを基本成分と
する高Ｃ高Ｃr系工具鋼粉末を充填した後、高温高圧ガ
ス雰囲気下において熱間静水圧プレス処理を施すことに
より、前記粉末を緻密に焼結すると共に前記ロール軸芯
材と一体化し、次いで熱処理を施して該複合ワークロー
ルに表面硬度Ｈv７５０〜８５０を付与する方法におい
て、前記熱処理として、該粉末焼結層からなる胴部外殻
材の表層のみに対し、表面温度を１０５０〜１２００℃
に加熱保持した後に噴水冷却する漸進誘導焼入れを施
し、次いで５００〜５４０℃の温度にて少なくとも２回
以上の焼戻し処理、もしくは−３０〜−１００℃の温度
にてサブゼロ処理を施し、更に５４０℃以下の温度にて
焼戻し処理を施すことを特徴とする高硬度で耐摩耗性、
耐事故性及び耐肌荒性が優れた冷間圧延用ワークロール
の製造方法、にある。That is, the gist of the present invention is to provide a metal capsule so as to form an annular space around a roll shaft core made of low alloy steel, and to provide C: 1.
5 to 3.0% and Cr: 14.0 to 25.0%, and Mo
And / or V in total of 1.5 to 6.0% is filled with a high C, high Cr system tool steel powder, and then hot isostatic pressing is performed in a high temperature and high pressure gas atmosphere. In the method of densely sintering the powder and integrating it with the roll core material, and then subjecting the composite work roll to a surface hardness Hv750 to 850, the heat treatment is performed from the powder sintered layer. The surface temperature is 1050-1200 ℃ only for the outer layer of the outer shell
After heating and holding at 0 ° C, gradual induction quenching is performed by cooling with a fountain, followed by tempering treatment at a temperature of 500 to 540 ° C at least twice or subzero treatment at a temperature of -30 to -100 ° C, and further 540 ° C. High hardness and wear resistance, characterized by being tempered at the following temperatures:
A method for manufacturing a work roll for cold rolling, which is excellent in accident resistance and surface roughening resistance.
以下に本発明を実施例に基づいて詳細に説明する。The present invention will be described in detail below based on examples.
まず、ロール素材の製造としては、金属カプセル内に環
状空間ができるようにロール軸芯材を挿入し、或いは取
付け、その環状空間内に高Ｃ高Ｃr系工具鋼からなる金
属粉末を充填した後、脱気、密封し、高温高圧ガス雰囲
気下、好ましくは１０００〜１２００℃、７００〜１０
００kg/cm2の条件にて熱間静水圧処理（ＨＩＰ）を施
す。ロール軸芯材としては低合金鋼を用いるのが適当で
あり、特に後述の調質処理に対し好ましい。また充填す
べき金属粉末としては、熱処理により、所要の表面硬度
(Ｈv７５０〜８５０)を確保すると共に他の必要な特性
を保証するために、Ｃ:１．５〜３．０％とＣr:１４．
０〜２５．０％、更にＭo及びＶのうちの１種又は２種
が合計で１．５〜６．０％となるものを基本成分とする
高Ｃ高Ｃr系工具鋼を用いる必要がある。この条件を満
たすならば、公知の工具鋼であってもよい。従来法のよ
うに単に高速度鋼又は硬質金属からなる粉末を用いただ
けでは、本発明での熱処理を施しても本発明の狙いとす
る優れた特性は得られない。First, in the manufacture of a roll material, after inserting or attaching a roll shaft core material so that an annular space is formed in a metal capsule, and filling the annular space with a metal powder made of a high C high Cr system tool steel, , Deaeration and sealing, under high temperature and high pressure gas atmosphere, preferably 1000 to 1200 ° C., 700 to 10
Hot isostatic pressing (HIP) is performed under the condition of 00 kg / cm 2 . It is suitable to use a low alloy steel as the roll shaft core material, and it is particularly preferable for the tempering treatment described later. As the metal powder to be filled, the required surface hardness is obtained by heat treatment.
(Hv750 to 850) and other necessary characteristics are guaranteed, C: 1.5 to 3.0% and Cr: 14.
It is necessary to use a high C, high Cr system tool steel whose basic component is 0 to 25.0%, and one or two types of Mo and V are 1.5 to 6.0% in total. . A known tool steel may be used as long as this condition is satisfied. Even if the heat treatment of the present invention is performed, the excellent properties aimed at by the present invention cannot be obtained by simply using powder made of high-speed steel or hard metal as in the conventional method.
次に、このようにして得た緻密な焼結層の外殻材を有す
る複合ロール素材につき、冷間圧延用ワークロールに要
求される品質特性を付与するため、胴部の外殻材の表層
部のみに対し、誘導加熱による焼入れ・焼戻しの熱処理
を施す。Next, in order to impart the quality characteristics required for the work roll for cold rolling to the composite roll material having the outer shell material of the dense sintered layer thus obtained, the surface layer of the outer shell material of the body part is added. Only induction hardening is performed by induction heating.
すなわち、上記表層部のみを１０５０〜１２００℃の温
度に急速加熱した後、噴水冷却して焼入れる。前記高Ｃ
高Ｃr系工具鋼を焼入れてＨｖ７５０以上の高硬度の表
面硬度を得るためには最低１０５０℃以上の温度に加熱
する必要がある。１０５０℃未満では冷間圧延用ワーク
ロールに要求される前記高硬度が得られ難く、また１２
００℃を超えると、結晶粒界での溶融が起り始め、上記
粉末としての特性が失われてしまう。That is, only the surface layer portion is rapidly heated to a temperature of 1050 to 1200 ° C., then cooled with a fountain and quenched. High C
In order to harden a high Cr tool steel and obtain a high surface hardness of Hv 750 or higher, it is necessary to heat it to a temperature of 1050 ° C. or higher. If it is less than 1050 ° C, it is difficult to obtain the high hardness required for the work roll for cold rolling, and 12
If the temperature exceeds 00 ° C., melting at the crystal grain boundaries begins to occur, and the characteristics of the powder are lost.
焼戻し処理としては、５００〜５４０℃の温度範囲にて
少なくとも２回以上の焼戻し処理を実施する必要があ
り、これにより組織が安定化すると共に所要の高硬度を
得ることができる。焼戻し温度が５００℃未満では、２
次硬化析出による硬度上昇が少なく、また５４０℃を超
えると、過時効となり、所要の前記高硬度が得られ難
い。高硬度を得るための適正焼戻し温度は焼入れ温度が
前記高硬度が得られる範囲内で高くできるなら、高くす
ることが望ましい。また、上記焼戻し処理が１回である
と、焼入れ時の残留オーステナイトがマルテンサイト組
織に変態して脆い組織が残留するので、少なくとも２回
以上の焼戻し処理を実施して安定な組織にする必要があ
る。２回目の焼戻し処理は１回目よりも５〜１０℃低い
温度で実施し、硬度を低下させないようにするのが好ま
しい。As the tempering treatment, it is necessary to perform the tempering treatment at least twice or more in the temperature range of 500 to 540 ° C., whereby the structure is stabilized and required high hardness can be obtained. If the tempering temperature is less than 500 ° C, 2
Hardness increase due to secondary hardening precipitation is small, and if it exceeds 540 ° C, overaging occurs, and it is difficult to obtain the required high hardness. The appropriate tempering temperature for obtaining high hardness is desirably high if the quenching temperature can be increased within the range where the high hardness is obtained. Further, if the tempering treatment is performed once, the retained austenite at the time of quenching is transformed into a martensite structure and a brittle structure remains, so it is necessary to perform the tempering treatment at least twice to obtain a stable structure. is there. The second tempering treatment is preferably performed at a temperature 5 to 10 ° C. lower than that of the first tempering treatment so as not to lower the hardness.
また、誘導焼入れ後サブゼロ処理を施しておけば、焼入
れによる残留オーステナイトは分解しマルテンサイト領
域に変態するので、その後の焼戻し処理は１回のみで安
定した組織が得られる。Further, if subzero treatment is performed after induction hardening, residual austenite due to hardening is decomposed and transformed into a martensite region, so that a stable structure can be obtained by performing tempering only once.
サブゼロ処理の温度としては−３０〜−１００℃が良
い。−３０℃以上では残留オーステナイトの分解が不十
分であり、また−１００℃で残留オーステナイトの分解
は飽和するので、それ以下の温度は必要ない。また焼戻
し処理は焼入れによるマルテンサイト組織変態のみを考
慮すればよいので、５４０℃以下が好ましく、それ以上
では軟化が著しくなり、ロールに要求される硬度が得ら
れない。The temperature of the sub-zero treatment is preferably -30 to -100 ° C. The decomposition of the retained austenite is insufficient at -30 ° C or higher, and the decomposition of the retained austenite is saturated at -100 ° C, so that the temperature lower than that is not necessary. Further, the tempering treatment only needs to consider the martensitic structure transformation by quenching, so that it is preferably 540 ° C. or lower, and if it is higher than that, softening becomes remarkable and the hardness required for the roll cannot be obtained.
焼戻し温度が高くなれば５４０℃までは、その温度に応
じてゆるやかに硬度が低下しい行くので、その範囲内で
ロールの要求品質に合わせた硬度設計がしやすい。If the tempering temperature becomes higher, the hardness gradually decreases up to 540 ° C. depending on the temperature, so that it is easy to design the hardness according to the required quality of the roll within the range.
以上の製造方法により、所要の高硬度を低下させること
なく、靭性のある安定した組織を有し、耐摩耗性、耐事
故性及び耐肌荒性が優れた冷間圧延用ワークロールを製
造することができる。By the above manufacturing method, a work roll for cold rolling having a stable structure with toughness and excellent wear resistance, accident resistance and surface roughening resistance is manufactured without lowering the required high hardness. be able to.
なお、前記誘導焼入れ処理の前処理として、軸材を対象
とした調質処理を施すならば、軸芯材の組織の改善によ
る靭性の向上と、軸材に所要硬度を付与することがで
き、特に使用時の境界の疲労特性を向上することもでき
る。As a pretreatment of the induction hardening treatment, if a heat treatment is applied to the shaft material, the toughness can be improved by improving the structure of the shaft core material, and the required hardness can be imparted to the shaft material. In particular, it is possible to improve the fatigue characteristics of the boundary during use.
具体的には、機械加工により軸部を削り出した後、軸芯
材(低合金鋼)のＡc3変態点と外殻材(高Ｃ高Ｃr系工具
鋼)のＡc1変態点の間の温度に加熱保持した後、全体を
空冷し、その後焼戻し処理を施すことにより、軸芯材の
組織を改善でき、軸部に所要の表面硬度を(Ｈｓ３０〜
３５)を付与することができる。また、軸部にそれ以上
の表面硬度が必要な場合には、前記温度範囲に加熱保持
後、胴部は空冷し、一方、軸部のみをその中心温度が３
５０〜４５０℃になる時間まで噴水冷却し、その後全体
を空冷し、更に焼戻し処理を施すことにより、軸部を調
質してもよい。なお、上記の如く噴水冷却の時間として
軸部の中心部の温度が３５０〜４５０℃になるまでとし
た理由は、３５０℃より低くすると胴部と軸部で温度勾
配が大きくなり、その部分で熱応力が増大し、割損に至
る危険が増すと共に境界での疲労特性が低下するからで
あり、また４５０℃を超える温度で噴水冷却を停止する
と、胴部の熱により軸部が復熱し、軸部表面が高温で焼
戻されて所要の軸部表面硬度が得られ難くなるからであ
る。また、上記焼戻し処理は、要求される軸部表面硬度
となるように適正な焼戻し温度を選んで実施することは
云うまでもない。Specifically, by machining after shaving the shaft, Jikushinzai Ac 3 transformation point and the outer shell material (low-alloy steel) between Ac 1 transformation point (high C and high Cr based tool steel) After heating and holding at the temperature, the whole is air-cooled and then tempered to improve the structure of the shaft core material, and the shaft portion has a required surface hardness (Hs30-
35) can be added. If the shaft portion requires a higher surface hardness, the body portion is air-cooled after heating and holding in the temperature range, while only the shaft portion has a center temperature of 3 ° C.
The shank may be heat-treated by cooling with a fountain until the temperature reaches 50 to 450 ° C., then air-cooling the whole body, and then performing tempering treatment. The reason for setting the temperature of the central portion of the shaft portion to 350 to 450 ° C. as the time for cooling the fountain as described above is that if the temperature is lower than 350 ° C., the temperature gradient between the body portion and the shaft portion becomes large, and at that portion. This is because the thermal stress increases, the risk of cracking increases, and the fatigue properties at the boundary decrease, and when the fountain cooling is stopped at a temperature above 450 ° C, the shank part reheats due to the heat of the body, This is because the shaft surface is tempered at a high temperature and it becomes difficult to obtain the required shaft surface hardness. Needless to say, the tempering treatment is performed by selecting an appropriate tempering temperature so that the required surface hardness of the shaft portion is obtained.
（実施例１） 内寸法２３０mmφ×１２００mmｌの金属カプセルに１５
０mmφで第１表に示す化学成分のロール軸芯材を挿入し
てその中心を固定し、得られた環状間隙に同表に示す化
学成分の高Ｃ高Ｃr系工具鋼粉末(外殻材)を充填し、金
属カプセル上端に上蓋を溶接した後、３００℃の温度下
で金属カプセル内を１０-2Ｔorrまで真空脱気し、脱気
管をプレスと溶接により密封した。(Example 1) 15 in a metal capsule having an inner size of 230 mmφ × 1200 mml
The roll shaft core material of the chemical composition shown in Table 1 was inserted at 0 mmφ and the center was fixed, and the high C, high Cr system tool steel powder of the chemical composition shown in the same table (outer shell material) was fixed in the obtained annular gap. Was filled and the upper lid was welded to the upper end of the metal capsule, the inside of the metal capsule was vacuum degassed to 10 -2 Torr at a temperature of 300 ° C., and the degassing pipe was sealed by pressing and welding.
次いで、ＨＩＰ処理装置内に上記金属カプセルを装入
し、１１５０℃で１０００kg／cm2の高温高圧ガス雰囲
気下で５時間保持してＨＩＰ処理した。Then, the above-mentioned metal capsules were loaded into a HIP processing apparatus, and HIP processing was carried out by holding them at 1150 ° C. in a high temperature and high pressure gas atmosphere of 1000 kg / cm 2 for 5 hours.
その後、得られたロール素材に機械加工を行なって軸部
と胴部を削り出した後、表面焼入れを実施した。表面焼
入れ方法としては、誘導加熱焼入れ法を適用した。すな
わち、胴径２０３mmφ、外殻層厚さ２６mmtの形状を有
する胴部を周波数６ＫＨｚ、表面加熱温度１１４０℃、
コイル通過時間１５０秒の条件にて誘導加熱した後、噴
水焼入れした。After that, the obtained roll material was subjected to machining to cut out the shaft portion and the body portion, and then surface quenching was performed. The induction hardening method was applied as the surface hardening method. That is, a body having a body diameter of 203 mmφ and a shell layer thickness of 26 mmt has a frequency of 6 KHz, a surface heating temperature of 1140 ° C.,
After induction heating under the condition of a coil passage time of 150 seconds, water quenching was performed.
更に、焼戻し処理を２回実施した。なお、焼戻し温度は
１回目を５２０℃、２回目を５１０℃とした。この方法
により製造した冷間圧延用複合ワークロールには、焼入
れに伴う境界部での割れ発生は認められず、胴部表面硬
度はＨv８５０を示し、Ｈv７５０以上で規定される硬化
深度は、第１図に示すように、８．５mmtであった。Furthermore, tempering treatment was performed twice. The tempering temperature was 520 ° C. for the first time and 510 ° C. for the second time. In the composite work roll for cold rolling manufactured by this method, no cracking was observed at the boundary part due to quenching, the body surface hardness was Hv850, and the hardening depth defined by Hv750 or more was As shown in the figure, it was 8.5 mmt.
（実施例２） 実施例１と同様の方法により、胴径４２５mmφ、胴長１
４２０mmｌのロール形状を得ることができる寸法のロー
ル素材を製造した。但し、軸芯材及び外殻材(粉末材)は
第２表に示すものを用いた。 (Example 2) By the same method as in Example 1, the diameter of the body is 425 mm and the length of the body is 1
A roll material having a size capable of obtaining a roll shape of 420 mm1 was manufactured. However, the shaft core material and outer shell material (powder material) shown in Table 2 were used.
このロール素材に対し、調質処理として、前記軸芯材の
Ａc3変態点(８３０℃)と外殻材のＡc1変態点(８５０℃)
との間の温度範囲に加熱保持した後、ロール全体を空冷
して焼入れ、その後６００℃で焼戻し処理した。As a heat treatment for this roll material, the Ac 3 transformation point (830 ° C) of the shaft core material and the Ac 1 transformation point (850 ° C) of the outer shell material were used.
After heating and holding in a temperature range between and, the entire roll was air-cooled and quenched, and then tempered at 600 ° C.
次いで、表面焼入れ方法として二重周波誘導焼入れ方法
を適用した。すなわち、胴部４２３mmφ、外殻層厚さ８
０mmtの形状を有する胴部を周波数が６０Ｈｚと１２０
０Ｈｚの二重周波で、表面加熱温度１１４０℃、各コイ
ルの通過時間５００秒の条件にて誘導加熱した後、噴水
焼入れした。Then, a dual frequency induction hardening method was applied as a surface hardening method. That is, body 423 mmφ, outer shell layer thickness 8
The body with a shape of 0 mmt has frequencies of 60 Hz and 120
After induction heating at a dual frequency of 0 Hz and a surface heating temperature of 1140 ° C. and a passage time of each coil of 500 seconds, fountain quenching was performed.
更にその後、焼戻し温度が１回目を５２０℃、２回目を
５１０℃とする焼戻し処理を実施した。After that, a tempering treatment was carried out at a tempering temperature of 520 ° C. for the first time and 510 ° C. for the second time.
この方法により製造した冷間圧延用複合ワークロール
は、胴部表面硬度がＨv８４０を示し、Ｈv７５０以上で
規定される硬化深度は、第１図に示すように、３１mmt
であり、また軸部表面硬度はＨs３８であった。The composite work roll for cold rolling manufactured by this method has a body surface hardness of Hv840, and the hardening depth defined by Hv750 or more is 31 mmt as shown in FIG.
And the surface hardness of the shaft portion was Hs38.
（実施例３） 実施例１と同様の方法、化学成分及び寸法形状で誘導焼
入れまでを実施した後、ロール本体を−７０℃の温度に
て１hrサブゼロ処理した後、１２０℃の温度にて焼戻し
処理を実施した。 (Example 3) After induction quenching was performed with the same method, chemical composition and dimensions as in Example 1, the roll body was subjected to sub-zero treatment for 1 hr at a temperature of -70 ° C, and then tempered at a temperature of 120 ° C. The treatment was carried out.
この方法により製造した冷間圧延用複合ワークロール胴
部表面硬度はＨｖ９００を示し、Ｈｖ７５０以上で規定
される硬化深度は第１図に示すように９．５mmtであっ
た。The surface hardness of the composite work roll body for cold rolling produced by this method was Hv900, and the hardening depth defined by Hv750 or more was 9.5 mmt as shown in FIG.
（実施例４） 実施例２と同様の方法で製造した複合ワークロールの胴
部表層から各種試験片を採取し、従来ロール材との比較
試験を行なった。なお、従来ロール材は第３表に示す化
学成分の溶解材Ａ、Ｂからなる一体ロールであり、本発
明例では、外殻材Ｃのみを第３表に示す化学成分のもの
を用い、軸芯材は実施例２と同様である。各供試材の硬
さを第３表に併記した。(Example 4) Various test pieces were sampled from the surface layer of the body of the composite work roll manufactured by the same method as in Example 2, and a comparative test with a conventional roll material was performed. Incidentally, the conventional roll material is an integrated roll composed of the melting materials A and B having the chemical components shown in Table 3, and in the present invention example, only the outer shell material C having the chemical composition shown in Table 3 is used. The core material is the same as in Example 2. The hardness of each test material is also shown in Table 3.
耐摩耗性については、ＳＣＭ４１５を相手材として２種
類の異なる摩擦速度０．３ｍ／sec、２．８６ｍ／secで
摩耗試験を行なった結果、第２図に示すように、いずれ
の摩擦速度の場合でも本発明の２Ｃ−１８Ｃr系外殻材
Ｃが最も優れている。 Regarding the wear resistance, as a result of performing a wear test at two different friction velocities of 0.3 m / sec and 2.86 m / sec using SCM415 as a mating material, as shown in FIG. However, the 2C-18Cr type outer shell material C of the present invention is the most excellent.
また、耐事故性については耐熱衝撃クラック性で調査し
た。耐熱衝撃クラック性試験は、１２００rpmで回転し
ているディスクに水を噴付けつつ試験片(２０ｔ×４０
ｗ×５０mmｌ)を１６０kgの荷重で２秒間押付け、発生
したクラック深さを調べた。各試験片のクラック深さを
硬さとの関係で整理した結果を第３図に示す。なお、Ａ
材、Ｂ材は１００〜１５０℃で焼戻しを行なったもので
ある。In addition, the accident resistance was investigated by thermal shock crack resistance. The thermal shock crack resistance test is carried out by spraying water onto a disc rotating at 1200 rpm while applying a test piece (20 t × 40
(w × 50 mm1) was pressed with a load of 160 kg for 2 seconds, and the depth of cracks generated was examined. The result of arranging the crack depth of each test piece in relation to hardness is shown in FIG. In addition, A
The material and the material B were tempered at 100 to 150 ° C.
同図より、２Ｃ−１８Ｃr系のＣ材がＡ材及びＳＫＤ１
１のＢ材に比べてかなり優れていることが確認された。From the figure, 2C-18Cr type C material is A material and SKD1
It was confirmed that it was considerably superior to the B material of No. 1.
また、被圧延材の表面品質を決定する耐肌荒性について
も、第４図に示すように、従来材であるＢ材が塊状の大
きな炭化物が認められるのに対し、Ｃ材では細かい炭化
物が一様に分布していることから判断して、Ｃ材はかな
り優れていると判断できる。Regarding the surface roughening resistance that determines the surface quality of the material to be rolled, as shown in FIG. 4, the conventional material B has lumpy large carbides, whereas the material C has fine carbides. Judging from the uniform distribution, it can be judged that the C material is considerably superior.
（発明の効果） 以上詳述したように、本発明によれば、軸芯材として低
合金鋼を、外殻材として特定成分の高Ｃ高Ｃr系工具鋼
粉末材を用いて粉末冶金的手段によって複合構造のロー
ルにし、更に特定の熱処理を施すので、冷間圧延用ワー
クロールとして必要な諸特性において欠けるところのな
い高品質で高信頼性のロールを提供することができるも
のである。(Effects of the Invention) As described in detail above, according to the present invention, a low alloy steel is used as a shaft core material, and a high C, high Cr system tool steel powder material of a specific component is used as an outer shell material for powder metallurgical means. Since the composite roll is made into a composite roll and further subjected to a specific heat treatment, it is possible to provide a roll of high quality and high reliability that does not lack the various properties required as a work roll for cold rolling.
また、ロール軸芯材を対象として特定の加熱温度範囲で
の調質処理を施すことにより、内外層境界での残留応力
が可及的に小さくでき、冷間圧延に供した時の境界の疲
労特性を向上できる利点もある。By subjecting the roll core material to a heat treatment in a specific heating temperature range, the residual stress at the boundary between the inner and outer layers can be reduced as much as possible, and the fatigue of the boundary during cold rolling is reduced. There is also an advantage that the characteristics can be improved.
また、従来の溶解材(ＳＫＤ１１材等)による一体ロール
に比べ、より高Ｃ高Ｃr系の鋼を外殻材として適用で
き、しかも微細な炭化物を均一に分布できるため、優れ
た耐摩耗性が得られるのみならず、偏析が殆どないた
め、優れた耐肌荒性が得られる。更に、０．８５Ｃ−
３．５Ｃr系の従来ロール材(溶解材)に比べても、熱衝
撃クラックが入り難く、たとえクラックが入ってもその
クラック深さは浅いので、圧延に供した場合、優れた耐
事故性が期待できる。In addition, compared with the conventional integrated roll made of melted material (SKD11 material, etc.), steel with higher C and higher Cr can be applied as the outer shell material, and moreover, fine carbide can be uniformly distributed, resulting in excellent wear resistance. Not only is it obtained, but there is almost no segregation, so excellent skin roughening resistance is obtained. Furthermore, 0.85C-
Compared to 3.5Cr type conventional roll material (melting material), thermal shock cracks are less likely to occur, and even if cracks occur, the depth of the cracks is shallow, so when subjected to rolling, excellent accident resistance is obtained. Can be expected.
このように、本発明では、高耐摩耗性、耐事故性及び耐
肌荒性を必要とする胴部表層のみを高Ｃ高Ｃr系工具鋼
化し、それらの特性を必要としない部分である軸芯部に
は低合金鋼を採用することにより、安価で、かつ、耐折
損性にも優れた複合ロールを提供できると共に、高硬度
で、かつ、耐摩耗性、耐事故性及び耐肌荒性に優れた冷
間圧延用ワークロールを提供することができる。As described above, according to the present invention, only the surface layer of the body portion, which requires high wear resistance, accident resistance, and surface roughening resistance, is made into a high-C, high-Cr tool steel, and a shaft which is a portion which does not require those characteristics. By using a low alloy steel for the core, it is possible to provide a composite roll that is inexpensive and has excellent breakage resistance, as well as high hardness, wear resistance, accident resistance and rough surface resistance. An excellent work roll for cold rolling can be provided.
第１図は本発明で得られる冷間圧延用ワークロールの硬
化深度曲線を示す図、 第２図は各種ロール材の耐摩耗性を比較して示す図、 第３図は各種ロール材の耐熱衝撃クラック特性(耐事故
性)を比較して示す図、 第４図は冷間圧延用ワークロールの胴部表層の金属組織
を示す顕微鏡写真(×４００)で、(ａ)は本発明に用いる
外殻材(粉末材)の場合、(ｂ)は従来ロール材(ＳＫＤ１
１)の場合である。FIG. 1 is a diagram showing a hardening depth curve of a work roll for cold rolling obtained by the present invention, FIG. 2 is a diagram showing a comparison of wear resistance of various roll materials, and FIG. 3 is a heat resistance of various roll materials. FIG. 4 shows a comparison of impact crack characteristics (accident resistance), and FIG. 4 is a micrograph (× 400) showing a metal structure of the body surface layer of a work roll for cold rolling. (A) is used in the present invention. In the case of outer shell material (powder material), (b) is the conventional roll material (SKD1)
This is the case of 1).
Claims (3)
状空間を形成するように金属カプセルを設け、該環状空
間内に重量割合でＣ:１．５〜３．０％と Ｃr:１４．０〜２５．０％と、更にＭo及び／又はＶが
合計で１．５〜６．０％とを基本成分とする高Ｃ高Ｃr
系工具鋼粉末を充填した後、高温高圧ガス雰囲気下にお
いて熱間静水圧プレス処理を施すことにより、前記粉末
を緻密に焼結すると共に前記ロール軸芯材と一体化し、
次いで熱処理を施して該複合ワークロールに表面硬度Ｈ
v ７５０〜８５０を付与する方法において、前記熱処理
として、該粉末焼結層からなる胴部外殻材の表層のみに
対し、表面温度を１０５０〜１２００℃に加熱保持した
後に噴水冷却する漸進誘導焼入れを施し、次いで５００
〜５４０℃の温度にて少なくとも２回以上の焼もどし処
理を施すことを特徴とする高硬度で耐摩耗性、耐事故性
及び耐肌荒性が優れた冷間圧延用ワークロールの製造方
法。1. A metal capsule is provided around a roll shaft core made of a low alloy steel so as to form an annular space, and C: 1.5 to 3.0% and Cr: in a weight ratio in the annular space. High C and high Cr with 14.0 to 25.0% and Mo and / or V totaling from 1.5 to 6.0% in total
After filling the system tool steel powder, by performing hot isostatic pressing in a high temperature and high pressure gas atmosphere, the powder is densely sintered and integrated with the roll shaft core material,
Then, heat treatment is applied to the composite work roll to obtain a surface hardness H.
v 750-850, in the heat treatment, a gradual induction quenching is performed in which only the surface layer of the outer shell material of the powder sintered layer is heated and maintained at a surface temperature of 1050 to 1200 ° C. and then cooled with a fountain. And then 500
A method for producing a work roll for cold rolling, which has high hardness and is excellent in wear resistance, accident resistance and surface roughness, characterized by performing a tempering treatment at least twice or more at a temperature of ˜540 ° C.
〜−１００℃の温度にてサブゼロ処理を施した後、５４
０℃以下の温度にて焼戻し処理を施す特許請求の範囲第
(1)項記載の冷間圧延用ワークロールの製造方法。2. As a heat treatment after the induction hardening, -30
After sub-zero treatment at a temperature of ~ -100 ° C, 54
A tempering treatment is performed at a temperature of 0 ° C. or lower.
The method for manufacturing a work roll for cold rolling according to the item (1).
て、該ロール軸芯材のＡc3変態点と該外殻材のＡc1変態
点の間の温度に加熱保持した後、該複合ワークロール全
体を空冷し、或いは軸部のみをその中心温度が３５０〜
４５０℃になるまで噴水冷却し、その後空冷する特許請
求の範囲第(１)項記載の冷間圧延用ワークロールの製造
方法。3. As a heat treatment for the shaft core material before induction hardening, after heating and holding at a temperature between the Ac 3 transformation point of the roll shaft core material and the Ac 1 transformation point of the outer shell material, The entire composite work roll is air-cooled, or only the shaft has a center temperature of 350-
The method for producing a work roll for cold rolling according to claim (1), which comprises cooling with a fountain until it reaches 450 ° C. and then air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60298541A JPH0643602B2 (en) | 1985-12-29 | 1985-12-29 | Method of manufacturing work roll for cold rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60298541A JPH0643602B2 (en) | 1985-12-29 | 1985-12-29 | Method of manufacturing work roll for cold rolling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62158803A JPS62158803A (en) | 1987-07-14 |
| JPH0643602B2 true JPH0643602B2 (en) | 1994-06-08 |
Family
ID=17861062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60298541A Expired - Lifetime JPH0643602B2 (en) | 1985-12-29 | 1985-12-29 | Method of manufacturing work roll for cold rolling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0643602B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114774643A (en) * | 2022-05-10 | 2022-07-22 | 无锡亿宝机械设备有限公司 | Improved heat treatment method for M42 material full-hardened working roll |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE7702959L (en) * | 1976-03-22 | 1977-09-23 | Industrial Materials Tech | ROLL CONSTRUCTION |
-
1985
- 1985-12-29 JP JP60298541A patent/JPH0643602B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62158803A (en) | 1987-07-14 |
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