JPH0262416A - Roll made of heat resistant stainless steel - Google Patents

Roll made of heat resistant stainless steel

Info

Publication number
JPH0262416A
JPH0262416A JP20943888A JP20943888A JPH0262416A JP H0262416 A JPH0262416 A JP H0262416A JP 20943888 A JP20943888 A JP 20943888A JP 20943888 A JP20943888 A JP 20943888A JP H0262416 A JPH0262416 A JP H0262416A
Authority
JP
Japan
Prior art keywords
roll
center hole
cooling water
coil
passage
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
JP20943888A
Other languages
Japanese (ja)
Other versions
JP2654975B2 (en
Inventor
Takeshi Uchiyama
剛 内山
Kazuo Usui
碓井 一生
Osamu Uchiyama
修 内山
Makoto Kumakawa
誠 熊川
Yoichi Matsubara
洋一 松原
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.)
JFE Engineering Corp
Dai Ichi High Frequency Co Ltd
Original Assignee
Dai Ichi High Frequency Co Ltd
NKK Corp
Nippon Kokan Ltd
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 Dai Ichi High Frequency Co Ltd, NKK Corp, Nippon Kokan Ltd filed Critical Dai Ichi High Frequency Co Ltd
Priority to JP63209438A priority Critical patent/JP2654975B2/en
Publication of JPH0262416A publication Critical patent/JPH0262416A/en
Application granted granted Critical
Publication of JP2654975B2 publication Critical patent/JP2654975B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Rolls And Other Rotary Bodies (AREA)
  • Continuous Casting (AREA)

Abstract

PURPOSE:To hardly generate any fatigue crack caused by thermo-stress by applying heat treatment on the surface side of a cooling water passage on the central axis of a roll so as to remain compression stress, and forming a layer hardened from this passage surface to the depth of about 1-5mm. CONSTITUTION:At first, a high frequency induction heat coil HC with a cooling jacket is arranged on the bottom of a roll center hole 1d while standing the roll 1a. The coil HC is supported by a coil supporting bar GB which is used commonly as a cooling water supply passage and an electric current supply passage so as to secure the clearance between the center hole 1d and the coil HC. Further the inner surface of the hole 1d is hardened continuously by moving this coil HC upward in the center hole 1d while a cooling water (w) spouts at the same time when an electric power supply is operated so as to induction- heat the inner surface of the center hole. After hardened, the inner surface of the center hole 1d is heated to 150 deg.C and tempered spending about 5 hours.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、例えば、製鉄所の連続鋳造ライン等において
、高温のビレット等の鋼片のガイド、矯正、引抜き、或
は、搬送に使用されるロールに関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention is used for guiding, straightening, drawing, or conveying hot billet or other steel billets, for example, in a continuous casting line of a steelworks. This is related to the role that is used.

〔従来の技術〕[Conventional technology]

連続鋳造ライン等に使用されている送りロールには、そ
のロールの上をスラブ、ブルーム、ビレット等の高温の
鋼片が走行するため、耐熱性が良好となるように調質等
により熱処理したマルテンサイト系のステンレスロール
が使用されている。
Feed rolls used in continuous casting lines, etc., run high-temperature steel pieces such as slabs, blooms, and billets on the rolls. Site-based stainless steel rolls are used.

このロールは、適宜外径及び長さに形成されたロール本
体の両側にボス状の軸部を設け、当該ロールの中心軸上
に冷却水通路となる中心孔を軸部を貫通して設けること
により形成されている。
This roll is provided with boss-shaped shaft parts on both sides of the roll main body formed to an appropriate outer diameter and length, and a central hole that serves as a cooling water passage is provided on the central axis of the roll passing through the shaft part. It is formed by

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記従来のロールは、その外面に通過する高温の鋼片が
接する一方、ロールの中心部に形成した冷却水通路とな
る中心孔に冷却水が供給されるため、鋼片の通過時にロ
ール外表面とロールの中心孔の部分との間に温度差を生
じて熱応力が発生する。
In the above conventional roll, the outer surface of the roll is in contact with the high-temperature steel billet passing through it, while cooling water is supplied to the center hole that serves as the cooling water passage formed in the center of the roll. A temperature difference is generated between the roller and the central hole portion of the roll, and thermal stress is generated.

因みに、現在使用されているビレット鋳造機のロールに
ついて、ビレット通過時におけるロール中心孔部分から
ロール外表面にかけての温度、並びに、温度分布を測定
、解析したところ、第5図のような温度分布を示し、こ
のときの円周方向における熱応力は第6図の数値に示す
通りであった。
By the way, when we measured and analyzed the temperature and temperature distribution from the center hole of the roll to the outer surface of the roll when the billet passes through the rolls of currently used billet casting machines, we found the temperature distribution as shown in Figure 5. The thermal stress in the circumferential direction at this time was as shown in the numerical values in FIG.

第5図、第6図の温度分布並びに熱応力を示す数値から
判るように、ロールの中心部には約50kg/am”の
引張応力がかかるため、従来のロールは、使用開始から
約3000チヤージ程度使用すると。
As can be seen from the temperature distribution and thermal stress values shown in Figures 5 and 6, a tensile stress of approximately 50 kg/am'' is applied to the center of the roll, so conventional rolls have a charge of approximately 3000 after the start of use. When used to an extent.

冷却水通路からロール内部にかけて疲労亀裂が発生進展
して使用不能になっていた。
Fatigue cracks had developed and progressed from the cooling water passage to the inside of the roll, making it unusable.

本発明は、このような使用時の熱応力による疲労亀裂が
生じない乃至は生じ難い耐熱ロールを提供することをそ
の課題とするものである。
An object of the present invention is to provide a heat-resistant roll in which fatigue cracks do not or hardly occur due to thermal stress during use.

〔課題を解決するための手段〕[Means to solve the problem]

本発明は、上記課題を解決するためになされたもので、
その構成は、ロールの中心軸上に貫設された冷却水通路
に、その表面側から焼入れ焼戻し処理を施すことにより
、当該冷却水通路の表面側に約50 kg / rrm
”以上の圧縮応力を残留させると共に、この通路表面か
ら約1〜5wm程度の深さまで硬化層を形成したことを
特徴とするものである。
The present invention was made to solve the above problems, and
The structure is such that the cooling water passage that runs through the central axis of the roll is quenched and tempered from the surface side, so that about 50 kg / rrm is applied to the surface side of the cooling water passage.
It is characterized by the fact that a compressive stress of the above level remains and that a hardened layer is formed to a depth of about 1 to 5 wm from the surface of the passage.

〔作 用〕[For production]

ロールの中心孔内面側に残留させられた圧縮残留応力は
、ビレット等の鋼片通過時の熱応力によって生じる引張
応力を緩和するので、前記圧縮応力により中心孔側に亀
裂が生じることはない。
The compressive residual stress left on the inner surface of the center hole of the roll alleviates the tensile stress caused by thermal stress when a billet or other steel billet passes through the roll, so the compressive stress does not cause cracks on the center hole side.

また、中心孔表面層に形成される硬化層がロール中心孔
側の耐力を増して疲労強度を高める。
Further, the hardened layer formed on the surface layer of the center hole increases the yield strength on the side of the center hole of the roll, thereby increasing the fatigue strength.

〔実施例〕〔Example〕

次に、本発明の実施例について、図に拠り説明する。 Next, embodiments of the present invention will be described with reference to the drawings.

第1図は本発明ロールの一例の縦断面図、第2図は第1
図に示すロールの熱処理態様の一例を概念的に示した部
分縦断面拡大図である。
FIG. 1 is a vertical cross-sectional view of an example of the roll of the present invention, and FIG.
FIG. 3 is an enlarged partial vertical cross-sectional view conceptually showing an example of a heat treatment mode of the roll shown in the figure.

而して、第1図に示す本発明ロールの材質は、10〜1
3%Crのマルテンサイト系ステンレス鋼であり、また
、その形状は、ロール本体1aの外径が350nmφ、
その長さが330nw++、この本体1aの両側に形成
した軸部1b、及び、取付部ICが638mで、ロール
全長が968m5、そして中心部に形成した冷却水通路
となる中心孔1dの口径が40maφに形成されている
Therefore, the material of the roll of the present invention shown in FIG.
It is made of 3% Cr martensitic stainless steel, and its shape is such that the outer diameter of the roll body 1a is 350 nmφ,
Its length is 330nw++, the shaft part 1b formed on both sides of this main body 1a and the mounting part IC are 638m, the total length of the roll is 968m5, and the diameter of the center hole 1d formed in the center which becomes the cooling water passage is 40maφ is formed.

従来、上記材質、形状のロールは、ロール外面に調質を
施していたが、調質後、冷却水通路となる中心孔1dの
内表面の性質は、硬さ265〜280Hvで、引張強さ
so 〜9oicg/m*”、耐力60〜70 kg 
/ mm”、引張残留応力5〜7 kg/ rtva”
テあった。
Conventionally, rolls of the above material and shape have been tempered on the outer surface of the roll, but after tempering, the inner surface of the center hole 1d, which serves as the cooling water passage, has a hardness of 265 to 280 Hv and a tensile strength. so ~9oicg/m*”, proof stress 60~70 kg
/ mm”, tensile residual stress 5-7 kg/rtva”
There was a time.

本発明ロールは、上記従来ロールの冷却水通路となる中
心孔1dを焼入れ焼戻し処理を施して。
In the roll of the present invention, the center hole 1d, which serves as the cooling water passage of the conventional roll, is quenched and tempered.

所定の機械的特性を付与したものである。ここでは、上
記の処理によりもたらされる特性を確認するため、第3
図に示すように、上記ロールと同一材質で外径160+
sφ、長さ200 mのテストピースTを作り、このテ
ストピースTの中心に上記ロールの中心孔1dと同一径
の穴1d’を貫設して焼入れ焼戻し処理を施し、この処
理がもたらす効果を測定してみた。以下、この処理並び
に効果について述べる。
It has been given certain mechanical properties. Here, in order to confirm the characteristics brought about by the above processing, we will introduce the third
As shown in the figure, the roll is made of the same material as the above roll and has an outer diameter of 160+.
A test piece T with a diameter of sφ and a length of 200 m was made, and a hole 1d' having the same diameter as the center hole 1d of the roll was made through the center of the test piece T, and a quenching and tempering treatment was performed to evaluate the effect of this treatment. I tried measuring it. This process and its effects will be described below.

(熱処理の方法) 高周波電源: 8 KH−600KVAインバータ焼入
れ方法:内面移動焼入れ 加熱温度: 1000℃〜1050℃ 冷   却:水冷 焼戻し条件=150℃X 5Hr (熱処理効果の測定) 残留応力測定:歪ゲージによる測定 測定箇所:孔の円周2箇所(0°、180°)外周部円
周2箇所(0” 、180” )それぞれ端面より40
in+の位 置 残留応力の測定結果は次の表に、また、断面硬度の測定
結果は第4図の図表に示す。
(Heat treatment method) High frequency power supply: 8 KH-600KVA inverter Hardening method: Internal movement quenching Heating temperature: 1000°C to 1050°C Cooling: Water cooling Tempering conditions = 150°C x 5 hours (Measurement of heat treatment effect) Residual stress measurement: Strain gauge Measuring points: 2 points on the circumference of the hole (0°, 180°), 2 points on the outer circumference (0", 180"), each 40 mm from the end surface
The measurement results of in+ positional residual stress are shown in the following table, and the measurement results of cross-sectional hardness are shown in the chart in FIG.

上記測定結果からも判る通り、中心孔の表面側には、約
50〜70kg/mm”程度の圧縮の残留応力が得られ
、また、深さ1〜5mm程度までにこの熱処理による硬
化層が形成されたのを確認できた。
As can be seen from the above measurement results, a compressive residual stress of about 50 to 70 kg/mm" was obtained on the surface side of the center hole, and a hardened layer was formed by this heat treatment to a depth of about 1 to 5 mm. I was able to confirm that it was done.

ここで、熱処理後のテストピースTの内表面の硬さは、
第4図の図表に示すように、500〜550Hvあるた
め、引張強さは約170〜190kg/+nm”程度と
なり、従って、耐力も130〜150kg/mm”程度
を見込むことができる。
Here, the hardness of the inner surface of the test piece T after heat treatment is
As shown in the chart of FIG. 4, since the tensile strength is 500 to 550 Hv, the tensile strength is approximately 170 to 190 kg/+nm'', and therefore the yield strength can be expected to be approximately 130 to 150 kg/mm''.

一般に、本発明ロールに施す熱処理は第2図に示すよう
に、第1図に示すロールを立てて置き。
Generally, the heat treatment applied to the roll of the present invention is carried out by placing the roll shown in FIG. 1 in an upright position, as shown in FIG.

まず、その中心孔1dの底に、冷却ジャケット付の高周
波誘導加熱コイルHCを配置する。コイルICは、冷却
水供給路と電流供給路を兼用するコイル支持バーGBに
支持されて、中心孔1dとコイルHCのクリアランスが
確保されると共に、電源が投入されて中心孔内面を誘導
加熱すると同時に冷却水Wが噴出されつつこのコイルH
Cが中心孔1dの中を上方へ移動することにより前記孔
1dの内面を連続的に焼入れする。
First, a high frequency induction heating coil HC with a cooling jacket is placed at the bottom of the center hole 1d. The coil IC is supported by a coil support bar GB that serves as both a cooling water supply path and a current supply path, and a clearance between the center hole 1d and the coil HC is secured, and when the power is turned on and the inner surface of the center hole is heated by induction. At the same time, the cooling water W is spouted out and this coil H
C moves upward in the center hole 1d, thereby continuously hardening the inner surface of the hole 1d.

焼入れ後、中心孔1dの内面は150℃に加熱され、約
5時間かけて焼戻しが施される。
After hardening, the inner surface of the center hole 1d is heated to 150° C. and tempered for about 5 hours.

なお、加熱手段は、高周波誘導加熱に限られるものでは
ないが、焼入が場所の狭隘であることなどを考慮すると
・、高周波誘導加熱が好ましい。
Although the heating means is not limited to high frequency induction heating, high frequency induction heating is preferable in consideration of the fact that the space for quenching is limited.

〔発明の効果〕〔Effect of the invention〕

本発明により、上記のテストピースTに施した熱処理を
、第1図に示すロールの冷却水通路となる中心孔1dに
、第2図に示す態様で施すことにより1次のような効果
をもつロールを得ることができた。
According to the present invention, by applying the heat treatment applied to the test piece T described above to the center hole 1d, which serves as the cooling water passage of the roll shown in FIG. 1, in the manner shown in FIG. 2, the following effects can be obtained. I was able to get a roll.

而して、ビレット等の鋼片の通過時に熱応力によって冷
却水通路近傍に生じる引張応力は約50kg/am”程
度にもなるが、前記熱処理によりロールの中心孔の内表
面側に予め50〜70 kg/ rm”以上の圧縮の残
留応力が付与されているため、ロールの冷却水通路とな
る中心孔1dに従来ロールのような亀裂は生じないか、
生じ難くなる。
The tensile stress generated in the vicinity of the cooling water passage due to thermal stress when a billet or other steel billet passes through is approximately 50 kg/am, but due to the heat treatment, tensile stress of 50 to Since a compressive residual stress of 70 kg/rm" or more is applied, the center hole 1d, which serves as the cooling water passage for the roll, will not crack like in conventional rolls.
It becomes difficult to occur.

また、本発明ロールは、その熱処理によって中心孔の内
表面側に硬化層が形成されているので、耐力値も上昇し
、従って、疲労強度も大幅に上昇するから、従来ロール
のような疲労と残留応力による亀裂の発生も大幅に押え
込むことができる。
In addition, since the roll of the present invention has a hardened layer formed on the inner surface of the center hole through heat treatment, the proof stress value increases, and therefore the fatigue strength also increases significantly, so it does not suffer from fatigue like conventional rolls. The occurrence of cracks due to residual stress can also be significantly suppressed.

実際に、上記実施例の熱処理を施した本発明ロール7本
を、連続鋳造ラインの引抜きロールに組込み、従来ロー
ルと比べつつ性能確認を行ってみたところ、従来ロール
は使用開始から3000チヤ一ジ程度で冷却水通路に亀
裂が生じ使用不能となったが1本発明ロールは従来ロー
ルの倍以上のチャージ数の使用が可能であった。
In fact, seven rolls of the present invention that had been heat-treated as described in the above example were assembled into a drawing roll of a continuous casting line, and performance was confirmed by comparing them with conventional rolls. However, the roll of the present invention could be used with more than twice the number of charges as the conventional roll, although cracks appeared in the cooling water passage and the roll became unusable.

本発明は以上の通りであるから、ビレット等の高温の鋼
片をガイド、矯正、引抜き、或は、搬送するロールとし
てきわめて有用である。
As described above, the present invention is extremely useful as a roll for guiding, straightening, drawing, or conveying high-temperature steel pieces such as billets.

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

第1図は搬送ロールの一例の縦断面図、第2図はこのロ
ールに熱処理を施す状態の一例を示す部分縦断面拡大図
、第3図はテストピースの一例の斜視図、第4図はテス
トピースの断面硬度の測定結果を示す図表、第5図は従
来ロールの温度分布を示す図表、第6図は従来ロールに
生じた円周方向引張応力を示す図表である。 1a・・・ロール本体、1b・・・軸部、1c・・・取
付部、1d・・・冷却水通路、T・・・テストピース、
Sg・・・歪ゲージ 第2図
Fig. 1 is a vertical cross-sectional view of an example of a transport roll, Fig. 2 is an enlarged partial longitudinal cross-section showing an example of the state in which this roll is subjected to heat treatment, Fig. 3 is a perspective view of an example of a test piece, and Fig. 4 is a FIG. 5 is a chart showing the measurement results of the cross-sectional hardness of the test piece, FIG. 5 is a chart showing the temperature distribution of the conventional roll, and FIG. 6 is a chart showing the circumferential direction tensile stress generated in the conventional roll. 1a...Roll body, 1b...Shaft part, 1c...Mounting part, 1d...Cooling water passage, T...Test piece,
Sg...Strain gauge Figure 2

Claims (1)

【特許請求の範囲】[Claims] ロールの中心軸上に貫設された冷却水通路の表面に焼入
れ焼戻し処理を施すことにより、当該冷却水通路の表面
側に約50kg/mm^2以上の圧縮応力を残留させる
と共に、この通路表面から約1〜5mm程度の深さまで
硬化層を形成したことを特徴とする耐熱ステンレスロー
ル。
By applying quenching and tempering to the surface of the cooling water passage penetrating the central axis of the roll, a compressive stress of approximately 50 kg/mm^2 or more remains on the surface side of the cooling water passage, and the surface of this passage is A heat-resistant stainless steel roll characterized in that a hardened layer is formed to a depth of about 1 to 5 mm.
JP63209438A 1988-08-25 1988-08-25 Heat resistant stainless steel roll Expired - Lifetime JP2654975B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63209438A JP2654975B2 (en) 1988-08-25 1988-08-25 Heat resistant stainless steel roll

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63209438A JP2654975B2 (en) 1988-08-25 1988-08-25 Heat resistant stainless steel roll

Publications (2)

Publication Number Publication Date
JPH0262416A true JPH0262416A (en) 1990-03-02
JP2654975B2 JP2654975B2 (en) 1997-09-17

Family

ID=16572862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63209438A Expired - Lifetime JP2654975B2 (en) 1988-08-25 1988-08-25 Heat resistant stainless steel roll

Country Status (1)

Country Link
JP (1) JP2654975B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090252904A1 (en) * 2008-04-08 2009-10-08 Herbert Weinberger Method for the production of machinery components and subsequently produced roll sleeve
JP2012152791A (en) * 2011-01-27 2012-08-16 Jfe Steel Corp Method for cooling roller in continuous casting machine, cooling apparatus, and cast slab supporting roller
JP2016203182A (en) * 2015-04-16 2016-12-08 新日鐵住金株式会社 Material selection method of roll for continuous casting, and roll for continuous casting

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5166973A (en) * 1974-12-06 1976-06-10 Hitachi Ltd ROOTANOKYODOZODAIHO
JPS5870959A (en) * 1981-10-26 1983-04-27 Kubota Ltd Roll for continuous casting

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5166973A (en) * 1974-12-06 1976-06-10 Hitachi Ltd ROOTANOKYODOZODAIHO
JPS5870959A (en) * 1981-10-26 1983-04-27 Kubota Ltd Roll for continuous casting

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090252904A1 (en) * 2008-04-08 2009-10-08 Herbert Weinberger Method for the production of machinery components and subsequently produced roll sleeve
JP2012152791A (en) * 2011-01-27 2012-08-16 Jfe Steel Corp Method for cooling roller in continuous casting machine, cooling apparatus, and cast slab supporting roller
JP2016203182A (en) * 2015-04-16 2016-12-08 新日鐵住金株式会社 Material selection method of roll for continuous casting, and roll for continuous casting

Also Published As

Publication number Publication date
JP2654975B2 (en) 1997-09-17

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