JPH0773727B2 - Hot-rolling method for seamless steel pipe - Google Patents
Hot-rolling method for seamless steel pipeInfo
- Publication number
- JPH0773727B2 JPH0773727B2 JP2124466A JP12446690A JPH0773727B2 JP H0773727 B2 JPH0773727 B2 JP H0773727B2 JP 2124466 A JP2124466 A JP 2124466A JP 12446690 A JP12446690 A JP 12446690A JP H0773727 B2 JPH0773727 B2 JP H0773727B2
- Authority
- JP
- Japan
- Prior art keywords
- roll
- caliber
- pipe
- lubricant
- cooling water
- 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 - Fee Related
Links
- 238000000034 method Methods 0.000 title claims description 14
- 229910000831 Steel Inorganic materials 0.000 title claims description 12
- 239000010959 steel Substances 0.000 title claims description 12
- 238000005098 hot rolling Methods 0.000 title claims description 7
- 238000005096 rolling process Methods 0.000 claims description 20
- 239000000498 cooling water Substances 0.000 claims description 19
- 239000000314 lubricant Substances 0.000 claims description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 239000011651 chromium Substances 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 229910001018 Cast iron Inorganic materials 0.000 claims description 4
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 4
- 239000007921 spray Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 4
- 206010013786 Dry skin Diseases 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920001875 Ebonite Polymers 0.000 description 1
- 230000000573 anti-seizure effect Effects 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0245—Lubricating devices
- B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、継目無鋼管用素管の熱間圧延方法に関するも
のである。TECHNICAL FIELD The present invention relates to a hot rolling method for a seamless steel pipe.
「従来の技術」 従来、マンドレルミル方式による継目無鋼管は、加熱さ
れた丸ビレットをピアサーにより穿孔して中空素管に
し、この中空素管をマンドレルミルにより減肉、延伸圧
延して製造されるが、前記マンドレルミルにおけるカリ
バーロールとしては、一般にダクタイル鋳鉄製のものが
多く用いられている。"Conventional technology" Conventionally, a seamless steel pipe by a mandrel mill method is manufactured by punching a heated round billet with a piercer to make a hollow shell, and then thinning and rolling the hollow shell by a mandrel mill. However, as the caliber roll in the mandrel mill, generally, the one made of ductile cast iron is often used.
「発明が解決しようとする課題」 ところで、前記ダクタイル鋳鉄製のカリバーロールは、
ショアー硬度が60程度であるため、素管を減肉、延伸圧
延した場合、晶出黒鉛の脱落、ロール表面の欠損等が発
生し易く、ロール自体の摩耗および肌あれが大きくな
る。従ってロール自体の摩耗は、製品の寸法精度を悪化
させ、またロール自体の肌あれは、素管に転写され外面
疵の原因となるので、摩耗および肌あれの少ないカリバ
ーロールの出現が要望されている。"Problems to be solved by the invention" By the way, the caliber roll made of ductile cast iron is
Since the Shore hardness is about 60, when the shell is thinned and stretch-rolled, the crystallized graphite is liable to drop off, the roll surface is damaged, and the roll itself becomes worn and roughened. Therefore, the wear of the roll itself deteriorates the dimensional accuracy of the product, and the skin roughness of the roll itself is transferred to the raw tube and causes external surface flaws.Therefore, the appearance of a caliber roll with less wear and skin roughness is desired. There is.
さらに、マンドレルミルにおけるカリバーロールにあっ
ては、素管速度に対してカリバー底部ではロール周速が
遅く、フランジ部ではロール周速が早くなるので、ロー
ルと素管とのスリップが大であり、かつ平均圧延圧力が
下記第１表に示す如く、鋼板の熱間圧延と比較して著し
く大きなため、ロールと素管とが焼付き易い。特にロー
ル表面硬度の高いロールの場合、表面が摩耗し難いの
で、焼付きが堆積し易く、従ってカリバーロールとし
て、ショアー硬度が60以上の例えばハイクロム系のロー
ルは使用されていない。Further, in the caliber roll in the mandrel mill, the roll peripheral speed is low at the caliber bottom part and the roll peripheral speed is high at the flange part with respect to the base pipe speed, so the slip between the roll and the base pipe is large, Moreover, as shown in Table 1 below, the average rolling pressure is remarkably large as compared with the hot rolling of the steel sheet, so that the roll and the raw pipe are easily seized. Particularly, in the case of a roll having a high surface hardness, the surface is less likely to be worn, so that seizure is likely to occur. Therefore, as the caliber roll, for example, a high chromium type roll having a Shore hardness of 60 or more is not used.
一方、カリバーロールの焼付きおよび肌あれ対策とし
て、焼付き防止剤（潤滑剤）を使用することが、例えば
特開平２−30312号公報にて開示されているが、実験の
結果、この方法ではロールの焼付きを軽減させることは
できても、従来ロールの硬度、組織状態に起因する摩
耗、欠損を著しく改善することは難しいことが判明し
た。 On the other hand, use of an anti-seizure agent (lubricant) as a countermeasure against seizure and skin roughness of the caliber roll is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-30312. Although it has been possible to reduce the seizure of the roll, it has been found that it is difficult to remarkably improve the hardness of the conventional roll and the wear and breakage due to the microstructure.
「課題を解決するための手段」 本発明は、かくの如き従来の問題を解決すべくなしたも
のであって、その要旨とするところは、マンドレルミル
におけるカリバーロールとして、ショアー硬度が60以上
で、ハイクロム系、ニッケルグレン系、ハイス系の鋳鉄
ロールあるいは鋳鋼ロールを用い、かつマンドレルミル
のスタンドの入側からカリバーロールと素管との間に潤
滑剤を連続的に散布すると共に、カリバーロールにのみ
冷却水を散布しながら素管を圧延することにある。"Means for Solving the Problem" The present invention was made to solve such conventional problems as described above, and the gist thereof is as a caliber roll in a mandrel mill, with a Shore hardness of 60 or more. , High chrome type, nickel grain type, high speed type cast iron rolls or cast steel rolls, and the lubricant is continuously sprinkled between the caliber roll and the raw pipe from the entry side of the stand of the mandrel mill. The only purpose is to roll the tube while spraying cooling water.
「作用」 前記の如く、マンドレミルにおけるカリバーロールとし
て、ショアー硬度が60以上で、ハイクロム系、ニッケル
グレン系、ハイス系の鋳鉄ロールあるいは鋳鋼ロールを
用い、かつマンドレルミルのスタンドの入側からカリバ
ーロールと素管との間に潤滑剤を連続的に散布すると共
に、カリバーロールにのみ冷却水を散布しながら素管を
圧延することにより、カリバーロールの摩耗および肌あ
れを、従来のロールよりも著しく抑制することができる
と共に、カリバーロールの焼付きを、少なくとも従来の
ロール程度に抑制することができる。[Operation] As described above, as the caliber roll in the mandrel mill, the Shore hardness is 60 or more, high chromium type, nickel grain type, high speed type cast iron roll or cast steel roll is used, and the caliber roll is provided from the entry side of the stand of the mandrel mill. By continuously spraying the lubricant between the base pipe and rolling the base pipe while spraying the cooling water only on the caliber roll, the wear and roughening of the caliber roll are significantly suppressed compared to the conventional roll. In addition, the seizure of the caliber roll can be suppressed to at least the level of the conventional roll.
「実施例」 次に本発明方法の第１実施例を説明すると、マンドレル
ミルにおける例えばNo.2〜No.4スタンドのカリバーロー
ルとして、クロムを約10％含有し、ショアー硬度が65の
ハイクロム系の鋳鋼ロール、ショアー硬度が70のニッケ
ルグレンロールおよびショアー硬度が75のハイロール
（比較例としてショアー硬度が60のダクタイル鋳鉄ロー
ル）を用い、そして第１図に示す如く、上記カリバーロ
ール１の圧延入側における内側部位に潤滑剤散布ノズル
２を配設し、かつカリバーロール１の圧延入側における
外側部位から圧延出側における全部位にわたって冷却水
散布ノズル３を配設し、前記潤滑剤散布ノズル２からホ
ウ素化合物を15％含有する水溶性潤滑剤を、カリバーロ
ール１と中空素管４との間へ約４／分散布すると共
に、各冷却水散布ノズル３から冷却水をカリバーロール
１へ約120／分散布しながら、中空素管４を3000本圧
延した。[Example] Next, a first example of the method of the present invention will be described. As a caliber roll of a No. 2 to No. 4 stand in a mandrel mill, for example, a high chrome system containing about 10% of chromium and having a Shore hardness of 65. Using a cast steel roll of No. 1, a nickel gren roll having a Shore hardness of 70, and a high roll having a Shore hardness of 75 (a ductile cast iron roll having a Shore hardness of 60 as a comparative example), and as shown in FIG. The lubricant spray nozzle 2 is disposed on the inner side of the side, and the cooling water spray nozzle 3 is disposed from the outer side on the rolling entrance side of the caliber roll 1 to the entire area on the rolling exit side. A water-soluble lubricant containing 15% of a boron compound is dispersed between the caliber roll 1 and the hollow shell 4 at a ratio of about 4 /, and each of the cooling water is sprayed. While sparging about 120 / min to the caliber roll 1 the cooling water from the Le 3 was rolled hollow shell 4 3000.
なお、図中、５はマンドレルバーである 次に本発明方法の第２実施例を説明すると、第２図に示
す如く、前記カリバーロール１の圧延入側における外側
部位と内側部位との中間に硬質ゴム製の水切り板６を配
設し、カリバーロール１の圧延入側における内側部位に
潤滑剤散布ノズル２を配設し、かつカリバーロール１の
圧延入側における外側部位から圧延出側における全部位
にわたって冷却水散布ノズル３を配設し、前記潤滑剤散
布ノズル２から水溶性潤滑剤を、カリバーロール１と中
空素管４との間へ約４／分散布すると共に、各冷却水
散布ノズル３から冷却水をカリバーロール１へ約120
／分散布しながら、中空素管４を3000本圧延した（比較
例も同じ）。Reference numeral 5 in the drawing is a mandrel bar. Next, a second embodiment of the method of the present invention will be described. As shown in FIG. 2, the mandrel bar is placed between the outer part and the inner part on the rolling-in side of the caliber roll 1. A drainer plate 6 made of hard rubber is provided, a lubricant spray nozzle 2 is provided at an inner portion of the caliber roll 1 on the rolling entry side, and the entire portion from the outer portion of the caliber roll 1 on the rolling entry side to the rolling exit side. The cooling water spray nozzles 3 are arranged so as to disperse the water-soluble lubricant from the lubricant spray nozzle 2 between the caliber roll 1 and the hollow shell 4 by about 4 /, and each cooling water spray nozzle Approximately 120 cooling water from 3 to caliber roll 1
/ While being dispersed, 3000 hollow shells 4 were rolled (the same applies to the comparative example).
次に本発明方法の第３実施例を説明すると、前記水切り
板６を使用することなく、中空素管４の圧延中は、前記
潤滑剤を約４／分散布し、ロール冷却水の散布は停止
し、また非圧延中は、潤滑剤の散布は停止し、ロール冷
却水を約120／分散布して、中空素管４を3000本圧延
した（比較例も同じ）。Next, the third embodiment of the method of the present invention will be described. Without using the draining plate 6, about 4 / dispersed lubricant was used during the rolling of the hollow shell 4 and the roll cooling water was sprayed. The suspension of the lubricant was stopped during non-rolling, the roll cooling water was distributed about 120 / dispersion, and 3000 hollow shells 4 were rolled (same in the comparative example).
次に本発明方法の第４実施例を説明すると、前記水切り
板６を使用することなく、ロール冷却水を連続的に約12
0／分散布し、かつ潤滑剤は散布しないで、中空素管
４を3000本圧延した（比較例も同じ）。Next, a fourth embodiment of the method of the present invention will be described. Without using the draining plate 6, about 12 roll cooling water is continuously supplied.
0 / dispersed and no lubricant was applied, and 3000 hollow shells 4 were rolled (the same applies to the comparative example).
上記各実施例におけるNo.2スタンドのロールの最大摩耗
量と、ロールの最大粗さと、ロールの焼付き程度とを下
記第２表に示す。The maximum amount of wear of the roll of No. 2 stand, the maximum roughness of the roll, and the degree of seizure of the roll in each of the above examples are shown in Table 2 below.
上記第２表にて明らかな如く、本発明による潤滑圧延方
法を適用しなかった第４実施例の場合、高硬度のハイク
ロムロールには重度の焼付きが発生した。しかし本発明
による潤滑圧延方法を適用した第１〜第３実施例の場
合、ハイクロム、ニッケルグレンおよびハイスの各ロー
ルの最大摩耗量および最大粗さにおいて、従来のダクタ
イルロールよりも著しく改善されていることが判る。 As is clear from Table 2 above, in the case of the fourth embodiment in which the lubrication rolling method according to the present invention was not applied, severe seizure occurred on the high hardness high chromium roll. However, in the case of the first to third embodiments to which the lubrication rolling method according to the present invention is applied, the maximum wear amount and the maximum roughness of the high chrome roll, the nickel grain roll and the high speed roll are remarkably improved as compared with the conventional ductile roll. I understand.
なお、前記第２実施例の如く、水切り板６を配設するこ
とにより、潤滑剤がロール冷却水によって希釈されるこ
とを防止できるため、ロールの最大摩耗量およびロール
の最大粗さを、さらに一層改善することができる。By disposing the draining plate 6 as in the second embodiment, it is possible to prevent the lubricant from being diluted with the roll cooling water, so that the maximum wear amount of the roll and the maximum roughness of the roll can be further improved. It can be further improved.
また継目無鋼管用素管の圧延は、鋼板の圧延と比較し
て、１本当りの圧延時間が短い（マンドレルミルでは５
〜20秒／本、鋼板の熱間圧延の仕上スタンドでは30〜12
0秒）ので、前記第３実施例の如く、圧延中は、ロール
冷却水を停止して潤滑圧延を行い、非圧延中は、ロール
を冷却し、潤滑剤を停止することにより、水切り板６を
使用することなく、ロールの最大摩耗量およびロールの
最大粗さを、従来のダクタイルロールよりも著しく改善
できる。Further, rolling of a seamless pipe for a steel pipe is shorter than that of a steel plate by rolling in a shorter time (5 for a mandrel mill).
~ 20 seconds / piece, 30 ~ 12 at finishing stand for hot rolling of steel sheet
Therefore, as in the third embodiment, during the rolling, the roll cooling water is stopped to perform the lubrication rolling, and during the non-rolling, the rolls are cooled and the lubricant is stopped, so that the draining plate 6 The maximum amount of wear of the roll and the maximum roughness of the roll can be remarkably improved as compared with the conventional ductile roll without using the.
「発明の効果」 以上述べた如く、本発明は、マンドレルミルにおけるカ
リバーロールとして、ショアー硬度が60以上で、ハイク
ロム系、ニッケルグレン系、ハイス系の鋳鉄ロールある
いは鉄鋼ロールを用い、かつマンドレルミルのスタンド
の入側からカリバーロールと素管との間に潤滑剤が連続
的に散布すると共に、カリバーロールにのみ冷却水を散
布しながら素管を圧延するので、カリバーロールの摩耗
および肌あれを、従来のロールよりも著しく抑制するこ
とができると共に、カリバーロールの焼付きを、少なく
とも従来のロール程度に抑制することができ、従って高
品質の継目無鋼管の製造が可能となる。"Effects of the Invention" As described above, the present invention, as the caliber roll in the mandrel mill, the Shore hardness is 60 or more, high chromium type, nickel grain type, using a high speed cast iron roll or steel roll, and the mandrel mill The lubricant is continuously sprinkled from the entrance side of the stand between the caliber roll and the raw pipe, and the raw pipe is rolled while sprinkling cooling water only on the caliber roll, so wear and roughening of the caliber roll can be prevented. In addition to being able to remarkably suppress the seizure of the caliber roll as compared with the conventional roll, it is possible to suppress seizure of the caliber roll to at least the level of the conventional roll, and thus it becomes possible to manufacture a high quality seamless steel pipe.
第１図は本発明方法の第１実施例を示す説明図、第２図
は本発明方法の第２実施例を示す説明図である。 １……カリバーロール ２……潤滑剤散布ノズル ３……冷却水散布ノズル ４……中空素管 ５……マンドレルバー ６……水切り板FIG. 1 is an explanatory view showing a first embodiment of the method of the present invention, and FIG. 2 is an explanatory view showing a second embodiment of the method of the present invention. 1 ... Caliber roll 2 ... Lubricant spray nozzle 3 ... Cooling water spray nozzle 4 ... Hollow shell 5 ... Mandrel bar 6 ... Drainer
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−215308（ＪＰ，Ａ) 特開 昭64−5610（ＪＰ，Ａ) 特開 平１−195260（ＪＰ，Ａ) 特開 昭54−122661（ＪＰ，Ａ) 特開 平２−30312（ＪＰ，Ａ) 実開 昭60−136804（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-63-215308 (JP, A) JP-A-64-5610 (JP, A) JP-A-1-195260 (JP, A) JP-A 54- 122661 (JP, A) JP-A-2-30312 (JP, A) Actual development Sho 60-136804 (JP, U)
Claims (3)
して、ショアー硬度が60以上で、ハイクロム系、ニッケ
ルグレン系、ハイス系の鋳鉄ロールあるいは鋳鋼ロール
を用い、かつマンドレルミルのスタンドの入側からカリ
バーロールと素管との間に潤滑剤を連続的に散布すると
共に、カリバーロールにのみ冷却水を散布しながら素管
を圧延することを特徴とする継目無鋼管用素管の熱間圧
延方法。1. As a caliber roll in a mandrel mill, a cast iron roll or a cast steel roll of Shore hardness 60 or more and having a shore hardness of 60 or more, a high chromium type, a nickel grain type, or a high speed type is used, and the caliber roll and the base are inserted from the entrance side of the stand of the mandrel mill. A hot rolling method for a base pipe for a seamless steel pipe, which comprises continuously spraying a lubricant between the base pipe and the caliber roll and rolling the base pipe while spraying cooling water only.
の入側に水切り板を設け、前記潤滑剤がロール冷却水に
よって希釈されないようにしたことを特徴とする請求項
第１に記載の継目無鋼管用素管の熱間圧延方法。2. The seamless pipe according to claim 1, wherein a drainer plate is provided on an inlet side of the caliber roll in rolling the raw pipe so that the lubricant is not diluted by roll cooling water. Hot rolling method for steel pipe.
を停止して、潤滑剤のみを散布し、素管の非圧延中は、
潤滑剤の散布を停止して、ロール冷却水のみを散布する
ことを特徴とする請求項第１に記載の継目無鋼管用素管
の熱間圧延方法。3. The rolling of the base pipe is stopped while the roll cooling water is sprayed, and only the lubricant is sprayed.
The hot rolling method for a seamless pipe for a steel pipe according to claim 1, wherein the spraying of the lubricant is stopped and only the roll cooling water is sprayed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2124466A JPH0773727B2 (en) | 1990-05-15 | 1990-05-15 | Hot-rolling method for seamless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2124466A JPH0773727B2 (en) | 1990-05-15 | 1990-05-15 | Hot-rolling method for seamless steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0422502A JPH0422502A (en) | 1992-01-27 |
| JPH0773727B2 true JPH0773727B2 (en) | 1995-08-09 |
Family
ID=14886225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2124466A Expired - Fee Related JPH0773727B2 (en) | 1990-05-15 | 1990-05-15 | Hot-rolling method for seamless steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0773727B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04105705A (en) * | 1990-08-28 | 1992-04-07 | Kawasaki Steel Corp | Method and device for hot-rolling seamless steel pipe |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54122661A (en) * | 1978-03-16 | 1979-09-22 | Kawasaki Steel Co | Hot oil rolling method by caliber roll |
| JPS60136804U (en) * | 1984-02-16 | 1985-09-11 | 日本鋼管株式会社 | Calibur roll anti-seize device |
| JPS63215308A (en) * | 1987-03-02 | 1988-09-07 | Sumitomo Metal Ind Ltd | Rolling method for sizing tube |
| JPH0635640B2 (en) * | 1987-06-29 | 1994-05-11 | 住友金属工業株式会社 | Roll for rolling with excellent abrasion resistance and seizure resistance |
| JP2672598B2 (en) * | 1987-10-09 | 1997-11-05 | 株式会社クボタ | Graphite-crystallized high chromium cast iron roll material and composite roll for rolling with excellent wear resistance and surface roughness |
-
1990
- 1990-05-15 JP JP2124466A patent/JPH0773727B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0422502A (en) | 1992-01-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |