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JPH0481209A - Manufacture of seamless stainless steel tube - Google Patents

Manufacture of seamless stainless steel tube

Info

Publication number
JPH0481209A
JPH0481209A JP19596590A JP19596590A JPH0481209A JP H0481209 A JPH0481209 A JP H0481209A JP 19596590 A JP19596590 A JP 19596590A JP 19596590 A JP19596590 A JP 19596590A JP H0481209 A JPH0481209 A JP H0481209A
Authority
JP
Japan
Prior art keywords
cooling water
less
stainless steel
roll
rolls
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
JP19596590A
Other languages
Japanese (ja)
Other versions
JP2590595B2 (en
Inventor
Tetsuya Nakanishi
哲也 中西
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
Sumitomo Metal Industries 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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP2195965A priority Critical patent/JP2590595B2/en
Publication of JPH0481209A publication Critical patent/JPH0481209A/en
Application granted granted Critical
Publication of JP2590595B2 publication Critical patent/JP2590595B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B27/00Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06Lubricating, cooling or heating rolls
    • B21B27/10Lubricating, cooling or heating rolls externally
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B19/00Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B19/00Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/04Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B19/00Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/06Rolling hollow basic material, e.g. Assel mills

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

PURPOSE:To enable piercing and elongation continuously, at a large quantity and with poor surface flaws by using an inclined roll mill, spraying cooling water to the rolls from a mist nozzle, and/or removing excessive cooling water on the roll surfaces with a wiper. CONSTITUTION:A billet, a bloom, a hollow tube stock 8 of austenitic stainless steel wherein component ranges in weight % are composed of <=0.5% C, 0.1-5.0% Si, 0.1-5.0% Mn, 10-50% Cr, 3-50%Ni, 1.0-5.0 Mo, <=0.01% S, <=0.03% P, <=0.03% O, 0.01-0.25% N, a content of each element satisfies an expression 1 and the balance is composed of Fe and unavoidable impurities are used. They are heated uniformly at a temperature zone 800-1300 deg.C, then, cooling water to rolls 1 is sprayed from mist nozzles 2 and/or they are pierced or elongated by an inclined roll mill for removing excessive cooling water by wipers 6 from the roll surfaces.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、マンネスマン製管方式の傾斜ロール式圧延
機による継目無オーステナイト系ステンレス鋼管の製造
方法において、穿孔、延伸方法に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for drilling and stretching in a method for manufacturing seamless austenitic stainless steel pipes using a Mannesmann pipe-forming inclined roll rolling mill.

従来の技術 継目無オーステナイト系ステンレス鋼管は、CO2およ
びI−I 2Sを含む腐食環境下で優れた耐食性、耐酸
化性、高温強度を示すところから、油井管、地熱井管、
ラインパイプ等に広く使用されるようになってきている
Conventional technology Seamless austenitic stainless steel pipes exhibit excellent corrosion resistance, oxidation resistance, and high-temperature strength in corrosive environments containing CO2 and I-I2S, and are therefore widely used in oil country tubular goods, geothermal country tubular goods, and geothermal country tubular goods.
It is becoming widely used for line pipes, etc.

継目無オーステナイト系ステンレス鋼管は、般にマンネ
スマンプラグミル方式、マンネスマンアラセルミル方式
等の傾斜圧延方式、あるいはユジーンセジュルネ方式、
エルハルトブツシュベンチ方式等の熱間押出法により製
造されている。
Seamless austenitic stainless steel pipes are generally manufactured using inclined rolling methods such as the Mannesmann plug mill method and the Mannesmann Arasel mill method, or the Eugene Séjournet method.
It is manufactured using a hot extrusion method such as the Erhard-Buschbench method.

このうち、オーステナイト系ステンレス鋼を素材とする
傾斜圧延方式による継目無管の製造においては、ロール
冷却水を供給しながら穿孔あるいは延伸すると、ロール
に付着した余剰の冷却水が被圧延材にまで回り込むこと
となる。その結果、被圧延材は、表面温度が低下し、変
形抵抗が表面部分のみ局部的に大きくなり、ガイドシュ
ー疵などの工具焼付き疵を誘発し、さらに後続のミルの
圧延作業が困難になる。
Among these, when manufacturing seamless pipes using the inclined rolling method using austenitic stainless steel as material, when drilling or stretching is performed while supplying roll cooling water, excess cooling water adhering to the rolls flows around to the rolled material. That will happen. As a result, the surface temperature of the material to be rolled decreases, and the deformation resistance increases locally on the surface, causing tool seizure flaws such as guide shoe flaws, and furthermore making subsequent mill rolling operations difficult. .

このため、傾斜ロール式圧延機により穿孔あるいは延伸
する間は、ロール冷却水を完全に停止するか、あるいは
被圧延材と次材との圧延間断中にロールに冷却水を供給
し、ロールの冷却を行っている。
For this reason, during perforation or stretching with an inclined roll rolling mill, the roll cooling water is either completely stopped, or cooling water is supplied to the rolls during rolling intervals between the rolled material and the next material to cool the rolls. It is carried out.

発明が解決しようとする課題 上記オーステナイト系ステンレス鋼を素材とする傾斜圧
延方式による継目無管の製造において、ロール冷却水を
完全に停止させて大量に穿孔あるいは延伸すると、傾斜
ロールの表面温度が上昇し、ロール表面での焼付き発生
、塑性流動により圧延中波圧延材とロール間にスリップ
現象が発生する。
Problems to be Solved by the Invention In manufacturing seamless pipes using the inclined rolling method using the austenitic stainless steel mentioned above, when the roll cooling water is completely stopped and a large amount of holes are perforated or stretched, the surface temperature of the inclined rolls increases. However, seizure occurs on the roll surface and a slip phenomenon occurs between the corrugated material and the roll due to plastic flow.

このスリップ現象は、被圧延材に表面疵の発生、尻詰り
などのミスロールの発生原因となり、圧延不能に陥る場
合がある。また、被圧延材と次材との圧延間断中にロー
ルに冷却水を供給する方法は、ロールの冷却が完全に行
なわれるまで、30秒以上も圧延作業を停止する必要が
ある。このため、生産能率の低下を招き、さらに圧延素
材の加熱炉での在炉の延長をきたし、高温腐食による被
圧延材の表面疵発生の原因となる。
This slip phenomenon causes surface flaws to occur in the material to be rolled, misrolling such as bottom clogging, and rolling may become impossible. Furthermore, in the method of supplying cooling water to the rolls during rolling intervals between the material to be rolled and the next material, it is necessary to stop the rolling operation for 30 seconds or more until the rolls are completely cooled. This results in a decrease in production efficiency, and also causes the length of time the rolled material remains in the heating furnace to be extended, causing surface flaws on the rolled material due to high-temperature corrosion.

この発明の目的は、オーステナイト系ステンレス鋼を素
材とする継目無管の製造において、上記問題点を解消し
、連続して大量に、しかも安定して表面疵の少なく穿孔
、延伸できる継目無管の製造方法を提供することにある
The purpose of this invention is to solve the above-mentioned problems in the production of seamless pipes made of austenitic stainless steel, and to produce seamless pipes that can be continuously punched and drawn in large quantities and stably with few surface defects. The purpose is to provide a manufacturing method.

また、オーステナイト系ステンレス鋼中の各元素の含有
量、s、o、p含有量を限定し、さらにCa、B、希土
類元素を添加することにより、熱間加工性を向上せしめ
るのである。
In addition, hot workability is improved by limiting the content of each element, s, o, and p content in the austenitic stainless steel, and further adding Ca, B, and rare earth elements.

課題を解決するための手段 上記目的を達成すべく種々検討の結果、ロール冷却水が
直接被圧延材に接触しないよう供給して圧延ロールを冷
却する。あるいはロール冷却水が直接被圧延材に接触し
ないよう、ロールが被圧延材に接触する前に余剰の冷却
水を除去することにより解消できるとの結論に到達した
Means for Solving the Problems In order to achieve the above object, as a result of various studies, the rolling rolls are cooled by supplying roll cooling water so that it does not come into direct contact with the rolled material. Alternatively, we have reached the conclusion that the problem can be solved by removing excess cooling water before the rolls come into contact with the rolled material so that the roll cooling water does not come into direct contact with the rolled material.

すなわちこの発明は、 成分範囲が、重量%で、 C:0.5%以下、   Si:0.1〜5.0%、M
n :  0.1〜5.0%、Cr:10−50%、N
i:3〜50%、  Mo :  1.0−5.0%、
S:0.01%以下、  P:0.03%以下、0:0
.03%以下、  N:0.01〜0.25%、さらに
、各元素の含有量が下記(1)式を満足させ、 残部がFeおよび不可避的不純物、 からなるオーステナイト系ステンレス鋼のビレット、ブ
ルーム、中空素管を、800〜1300℃の温度域で均
熱したのち、ロールに対する冷却水をミストノズルから
噴霧させ、がっ/またはロール表面の余剰冷却水をワイ
パーにより除去する傾斜ロル式圧延機により穿孔または
延伸するのである。
That is, in this invention, the component range is, in weight%, C: 0.5% or less, Si: 0.1 to 5.0%, M
n: 0.1-5.0%, Cr: 10-50%, N
i: 3-50%, Mo: 1.0-5.0%,
S: 0.01% or less, P: 0.03% or less, 0:0
.. 03% or less, N: 0.01 to 0.25%, the content of each element satisfies the following formula (1), and the balance is Fe and unavoidable impurities. , Inclined roll rolling mill in which the hollow shell is soaked in a temperature range of 800 to 1300°C, then cooling water is sprayed onto the rolls from a mist nozzle, and excess cooling water on the roll surface is removed by a wiper. perforation or stretching.

△ [Ni] = %Ni+0.57.Mn+30(Z
C+ZN)+8.2−1.1 (%Cr+%Mo+1.
5ZSi+〇、5%Nb) ≧−2,0−(1)式また
、成分範囲が、重量%で、 C:0.5%以下、   Si:0.1〜5.0%、M
n :  0.1〜5.0%、 Cr:10−50%、
Ni:3〜50%、  Mo :  1.0−5.0%
、S:0.01%以下、  P:0.03%以下、0:
0.03%以下、  N:0.01〜0.25%、各元
素の含有量が下記(1)式を満足させ、さらに、希土類
元素、Ca5Bを1種または2種以上をo、 ooio
〜0.3%、 残部がFeおよび不可避的不純物、 からなるオーステナイト系ステンレス鋼のビレット、ブ
ルーム、中空素管を、800〜1300℃の温度域で均
熱したのち、ロールに対する冷却水をミストノズルから
噴霧させ、がっ/またはロール表面の余剰冷却水をワイ
パーにより除去する傾斜ロール式圧延機により穿孔また
は延伸するのである。
△ [Ni] = %Ni+0.57. Mn+30(Z
C+ZN)+8.2-1.1 (%Cr+%Mo+1.
5ZSi+〇, 5%Nb) ≧-2,0-Formula (1) In addition, the component range is in weight%: C: 0.5% or less, Si: 0.1 to 5.0%, M
n: 0.1-5.0%, Cr: 10-50%,
Ni: 3-50%, Mo: 1.0-5.0%
, S: 0.01% or less, P: 0.03% or less, 0:
0.03% or less, N: 0.01 to 0.25%, the content of each element satisfies the following formula (1), and one or more rare earth elements, Ca5B, o, ooio
~0.3%, the balance being Fe and unavoidable impurities, billets, blooms, and hollow tubes of austenitic stainless steel are soaked in a temperature range of 800 to 1300°C, and then cooling water is applied to the rolls through a mist nozzle. Perforation or stretching is carried out using an inclined roll rolling mill in which excess cooling water is sprayed from the surface of the roll and/or excess cooling water on the roll surface is removed by a wiper.

△[Ni] = ZNi+0.5%Mn+30 (ZC
+ZN)+8.2−1.1 (Er+%Mo+1.5Z
Si+0.5XNb) ≧−2,0−(1)式%式% この発明方法において、オーステナイト系ステンレス鋼
の成分組成範囲を限定した理由を説明する。なお、以降
の鋼成分の%は断わりのない限りすべて重量%を示す。
△[Ni] = ZNi+0.5%Mn+30 (ZC
+ZN)+8.2-1.1 (Er+%Mo+1.5Z
Si+0.5XNb) ≧-2,0-(1) Formula % Formula % The reason why the composition range of the austenitic stainless steel is limited in the method of this invention will be explained. Note that all percentages of steel components hereinafter indicate weight percentages unless otherwise specified.

Cを0.5%以下としたのは、Cが多いとCr炭化物の
発生により耐食性が低下するからである。
The reason why the C content is set to 0.5% or less is that if the C content is too large, corrosion resistance will decrease due to the generation of Cr carbides.

Siを0.1〜5.0%としたのは、Siより脱酸する
が、0.1%未満では効果がなく、また、5.0%を超
えると鋼の靭性が低下する。
Setting Si to 0.1 to 5.0% deoxidizes better than Si, but if it is less than 0.1%, there is no effect, and if it exceeds 5.0%, the toughness of the steel decreases.

Mnを0.1〜5.0%としたのは、Mnは高温強度を
増すために必要であるが、0.1%未満では効果がなく
、また、5.0%を超えると鋼の強度が低下する。
The reason for setting Mn to 0.1 to 5.0% is that Mn is necessary to increase high-temperature strength, but it has no effect if it is less than 0.1%, and if it exceeds 5.0%, it reduces the strength of the steel. decreases.

Crを10〜50%としたのは、Crは高温強度を高め
るため必要であるが、10%未満ではステンレス鋼とし
ての効果がなく、また、50%を超えると一般にオース
テナイト系を外れるからである。
The reason why Cr is set at 10 to 50% is that Cr is necessary to increase high-temperature strength, but if it is less than 10%, it will not be effective as a stainless steel, and if it exceeds 50%, it will generally lose its austenitic state. .

Niを3〜50%としたのは、Niは高温強度を高める
ため必要であるが、3%未満では高温強度向上の効果が
なく、また、50%を超えると一般にオーステナイト系
を外れるからである。
The reason why Ni is set at 3 to 50% is that Ni is necessary to increase high-temperature strength, but if it is less than 3%, it has no effect on improving high-temperature strength, and if it exceeds 50%, it generally leaves the austenitic system. .

Moを1.0〜5.0%としたのは、Moは高温強度を
高めるため必要であるが、1.0%未満では高温強度向
上の効果がなく、また、5.0%を超えると靭性が低下
するからである。
Mo is set at 1.0 to 5.0% because Mo is necessary to increase high-temperature strength, but if it is less than 1.0%, it has no effect on improving high-temperature strength, and if it exceeds 5.0%, This is because toughness decreases.

Sを0.01%以下、Pを0.03%以下、Oを0.0
3%以下としたのは、S、P、0はいずれも結晶粒界を
弱くし、熱間加工性を悪化させるためである。
S 0.01% or less, P 0.03% or less, O 0.0
The reason why the content is set at 3% or less is that S, P, and 0 all weaken grain boundaries and deteriorate hot workability.

Nを0.01〜0.25%としたのは、Nは熱間加工性
を高めるために必要な元素であるが、0.01%未満て
はその効果がなく、また、0.25%を超えると靭性が
悪化するからである。
The reason why N is set at 0.01 to 0.25% is that N is a necessary element to improve hot workability, but if it is less than 0.01%, it has no effect. This is because the toughness deteriorates if it exceeds this.

各元素の含有量が下記(1)式を満足させるよう限定し
たのは、オーステナイト相を安定化させるために制限し
たのである。
The content of each element was limited to satisfy the following formula (1) in order to stabilize the austenite phase.

△ [Ni] =χNi+0.5%Mn+30CZC+
ZN)+8.2−1.1 (’lcr+XMo+1.5
ZSi+0.5%Nb) ≧−2,0−(1)式希土類
金属、Ca、Bを0.0010−0.3%としたのは、
希土類元素、Ca、Bは熱間加工性を高めるために必要
であるが、0.0010%未満では効果がなく、また、
0.3%を超えると清浄度が悪化するからである。
△ [Ni] =χNi+0.5%Mn+30CZC+
ZN)+8.2-1.1 ('lcr+XMo+1.5
ZSi+0.5%Nb) ≧-2,0-(1) Formula rare earth metal, Ca, and B are set to 0.0010-0.3% because
Rare earth elements, Ca, and B are necessary to improve hot workability, but if they are less than 0.0010%, they are ineffective, and
This is because if it exceeds 0.3%, the cleanliness deteriorates.

この発明においては、前記成分組成のオーステナイト系
ステンレス鋼のビレット、ブルーム、中空素管を、80
0〜1300℃の温度域で均熱したのち、ロールに対す
る冷却水をミストノズルから噴霧させ、かつ/またはロ
ール表面の余剰冷却水をワイパーにより除去する傾斜ロ
ール式圧延機により穿孔または延伸するので、ロールに
ミストスプレィノズルにより噴霧された冷却水は、極め
て微細な霧状であるから、ロールの保有熱によって速や
かに蒸発し、被圧延材に回り込むことがない。また、ロ
ール表面上にワイパーを配設したから、ロールにスプレ
ーされた冷却水は、ワイパーにより掻き取られるから、
被圧延材に回り込むことがなく、被圧延材の局部的冷却
が完全に防止できる。
In this invention, billets, blooms, and hollow tubes of austenitic stainless steel having the above-mentioned composition are
After soaking in a temperature range of 0 to 1300°C, perforation or stretching is performed using an inclined roll rolling mill that sprays cooling water onto the roll from a mist nozzle and/or removes excess cooling water on the roll surface with a wiper. Since the cooling water sprayed onto the rolls by the mist spray nozzle is in the form of extremely fine mist, it quickly evaporates due to the heat retained by the rolls and does not circulate into the material to be rolled. In addition, since the wiper is placed on the roll surface, the cooling water sprayed on the roll is scraped off by the wiper.
It does not go around to the rolled material, and local cooling of the rolled material can be completely prevented.

ロール表面上に配設するワイパーとしては、耐熱ゴム製
の水切り板をロールの全長にわたって配設し、かつエア
ーワイパーを所定の角度で複数個併設することにより、
ロール冷却に供された余剰の冷却水を効果的に除去する
ことができる。
As a wiper placed on the roll surface, a heat-resistant rubber draining plate is placed along the entire length of the roll, and multiple air wipers are installed at a predetermined angle.
Excess cooling water used for cooling the rolls can be effectively removed.

実施例 第1図ないし第4図は、このQ明方法を実施する装置構
成の概要を示すもので、第1図はこの発明方法を実施す
る装置の概略構成図、第2図はミストスプレーノズルの
説明図、第3図はエアーワイパー用のエアースプレーノ
ズルの説明図、第4図は水切り板式のワイパーの説明図
である。
Embodiment Figures 1 to 4 show an overview of the configuration of an apparatus for carrying out this Q-light method. FIG. 3 is an explanatory diagram of an air spray nozzle for an air wiper, and FIG. 4 is an explanatory diagram of a drain plate type wiper.

第1図において、圧延ロール(1)にそれぞれ冷却用の
ミストスプレーノズル(2)を配設する。ミストスプレ
ーノズル(2)は、第2図に示すとおり冷却水供給口(
3)と圧空供給口(4)を有し、圧空により冷却水をミ
スト状で噴霧する。ミストスプレーノズル(2)は、ロ
ール(1)の大きさ(ロール径、ロール長さ)、操業状
況などから勘案して仕様、個数を決定し、ミストスプレ
ーノズル(2)の取付は位置、角度は、第1図に示すよ
うに配置する。
In FIG. 1, cooling mist spray nozzles (2) are provided on each rolling roll (1). The mist spray nozzle (2) is connected to the cooling water supply port (
3) and a compressed air supply port (4), which sprays cooling water in a mist form using compressed air. The specifications and number of the mist spray nozzle (2) are determined by taking into account the size of the roll (1) (roll diameter, roll length), operating conditions, etc., and the installation position and angle of the mist spray nozzle (2) are determined by are arranged as shown in FIG.

ロール(1)の水切りは、第3図に示すエアースプレィ
ノズル(5)と耐熱性ゴムからなる水切り板(6)とで
構成される。水切り板(6)は、被圧延材(8)近傍に
第4図に示すとおり取付は板(7)に取付けて配置し、
その前にエアースプレィノズル(5)を設置して、先ず
ロール(1)に付着した余剰の冷却水をエアーにより被
圧延材(8)とは逆方向に吹き飛ばす。ついで水切り板
(6)により水切りを行うのである。なお、(9)はガ
イドシュー、(10)はプラグである。
The drainer of the roll (1) is composed of an air spray nozzle (5) shown in FIG. 3 and a drainer plate (6) made of heat-resistant rubber. The drain plate (6) is attached to the plate (7) near the material to be rolled (8) as shown in Fig. 4.
Before that, an air spray nozzle (5) is installed to first blow off excess cooling water adhering to the roll (1) with air in the opposite direction to the rolled material (8). Then, the water is drained using a drain plate (6). Note that (9) is a guide shoe and (10) is a plug.

実施例1 第1表に示すA′、B2種類の外径187mm 、長さ
1520mmのオーステナイト系ステンレス鋼のビレッ
トを、1170℃に均熱したのち、第1図で説明したロ
ール径1200mm、  ロール長さ 711.2mm
のマンネスマン穿孔機により、穿孔ロールの冷却方法を
変えてそれぞれ25秒ピッチで連続80本穿孔圧延し、
外径192mm、肉厚15.0mm、長さ5000mm
の中空素管とした。
Example 1 Two types of austenitic stainless steel billets, A' and B shown in Table 1, with an outer diameter of 187 mm and a length of 1520 mm were soaked at 1170°C, and then rolled with a roll diameter of 1200 mm and a roll length as explained in Fig. 1. 711.2mm
Using Mannesmann's perforation machine, 80 perforation rolls were continuously perforated and rolled at a pitch of 25 seconds by changing the method of cooling the perforation rolls.
Outer diameter 192mm, wall thickness 15.0mm, length 5000mm
It was made into a hollow tube.

この場合の穿孔機の段取りは、ロール交叉角10度、ロ
ール傾斜角15度、ロール開度165mm、ガイド開度
186mm、プラグ径149mm、プラグリード120
mmであった。
In this case, the setup of the drilling machine is as follows: roll crossing angle 10 degrees, roll inclination angle 15 degrees, roll opening 165 mm, guide opening 186 mm, plug diameter 149 mm, plug lead 120 mm.
It was mm.

ロールの冷却は、ミストスプレーノズルを各ロルに3個
ずつ設置し、エアー圧4kg/cm2、水圧5kg/c
m 、エアー供給量17.2Nm3/ hr/個、水量
14.6リツトル/min/個、ノズルとロール間距離
200mmで行った。
For cooling the rolls, three mist spray nozzles are installed on each roll, and air pressure is 4 kg/cm2 and water pressure is 5 kg/cm.
The test was carried out at an air supply rate of 17.2 Nm3/hr/piece, a water amount of 14.6 liters/min/piece, and a distance between the nozzle and the roll of 200 mm.

また、水切りは、水切り用エアースプレィノズルを各ロ
ールに5個ずつ設置し、エアー圧4kg/cm2、エア
ー供給量80ONI、/min/個、ノズルとロル間距
離200mmで実施すると共に、耐熱ゴム製の水切り板
を併用した。
In addition, for draining, five air spray nozzles for draining were installed on each roll, and the air pressure was 4 kg/cm2, the air supply amount was 80 ONI, /min/nozzle, and the distance between the nozzle and the roll was 200 mm. A draining board was also used.

そして穿孔効率、ロール表面焼付き発生有無、ガイドシ
ュー焼付き疵発生率および内外表面カブレ疵発生率を測
定し評価した。その結果を第2表に示す。
Then, the perforation efficiency, roll surface seizure occurrence, guide shoe seizure flaw occurrence rate, and inner and outer surface blister flaw occurrence rate were measured and evaluated. The results are shown in Table 2.

以下余白 実施例2 第3表に示す成分組成のC,D2種類のオーステナイト
系ステンレス鋼の外径10mmの管を、ザーモレスター
試験機を用い、引張り加工度40%、歪速度5X10−
” 5ec−’、試験温度900℃、1000℃、11
00℃の試験条件で引張り試験を実施し、引張り後の試
験片縦断面を200倍の光学顕微鏡で10視野観察し、
■視野当たりの微小粒界割れ延べ長さを測定した。その
結果を第5図に示す。
Below is a margin Example 2 A tube with an outer diameter of 10 mm made of two types of austenitic stainless steel, C and D, having the composition shown in Table 3, was tested using a thermorester tester with a tensile workability of 40% and a strain rate of 5X10-
"5ec-', test temperature 900℃, 1000℃, 11
A tensile test was carried out under the test conditions of 00°C, and the longitudinal section of the test piece after tension was observed in 10 fields using an optical microscope with a magnification of 200 times.
■The total length of micrograin boundary cracks per field of view was measured. The results are shown in FIG.

第5図に示すとおり、Caを添加したDのオステナイト
系ステンレス鋼の場合は、微小粒界割れはほとんど認め
られない。
As shown in FIG. 5, in the case of Ca-added austenitic stainless steel D, almost no micrograin boundary cracks are observed.

以下余白 実施例3 実施例2の第3表りと同じ成分組成の外径が457、2
mm、肉厚19.1mmの継目無オーステナイト系ステ
ンレス鋼管の高周波曲げ試験を実施した。
The following margin Example 3 The outer diameter of the same component composition as the third table of Example 2 is 457, 2
A high-frequency bending test was conducted on a seamless austenitic stainless steel pipe with a wall thickness of 19.1 mm.

試験条件は、曲げ半径1.5DR[685,8R]、送
り速度Q、 2mm / sec [歪速度= lXl
0”” 5ec−’] 、加工温度1050〜1100
℃であった。
The test conditions were bending radius 1.5DR [685,8R], feed rate Q, 2mm/sec [strain rate = lXl
0""5ec-'], processing temperature 1050-1100
It was ℃.

曲げ加工後のミクロ観察では、微小粒界割れは認められ
なかった。
Microscopic observation after bending revealed no micrograin boundary cracks.

発明の効果 以上述べたとおり、この発明方法によれば、熱間加工性
に優れた継目無オーステナイト系ステンレス鋼管を、マ
ンネスマン製管法により、表面疵少なく、安定して大量
に製造することができ、その効果は大きい。
Effects of the Invention As described above, according to the method of the invention, seamless austenitic stainless steel pipes with excellent hot workability can be stably manufactured in large quantities with few surface defects using the Mannesmann pipe manufacturing method. , the effect is great.

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

第1図はこの発明方法を実施する装置の概略構成図、第
2図はミストスプレーノズルの説明図、第3図はエアー
ワイパー用のエアースプレーノズルの説明図で、(a)
図は正面図、(b)図は一部切欠図、第4図は水切り板
式のワイパーの説明図、第5図は実施例2における鋼種
別の試験温度とミクロ割し延へ長さの関係を示すグラフ
である。 1・・・ロール、 2・・・ミストスプレーノズル 3・・・冷却水供給口、 4・・・圧空供給口、5・・
・エアースプレーノズル、 6・・・水切り板、    7・・・取付は板8・・被
圧延材、    9・・・ガイドシュー〇・・・プラグ
Fig. 1 is a schematic diagram of an apparatus for carrying out the method of the present invention, Fig. 2 is an explanatory diagram of a mist spray nozzle, and Fig. 3 is an explanatory diagram of an air spray nozzle for an air wiper.
The figure is a front view, (b) is a partially cutaway view, Figure 4 is an explanatory diagram of a drain plate type wiper, and Figure 5 is the relationship between test temperature and micro elongation for each steel type in Example 2. This is a graph showing. 1... Roll, 2... Mist spray nozzle 3... Cooling water supply port, 4... Compressed air supply port, 5...
・Air spray nozzle, 6...Draining plate, 7...Mounting plate 8...Rolled material, 9...Guide shoe〇...Plug,

Claims (1)

【特許請求の範囲】 1 成分範囲が、重量%で、 C:0.5%以下、Si:0.1〜5.0%、Mn:0
.1〜5.0%、Cr:10〜50%、Ni:3〜50
%、Mo:1.0〜5.0%、S:0.01%以下、P
:0.03%以下、O:0.03%以下、N:0.01
〜0.25%、さらに、各元素の含有量が下記(1)式
を満足させ、 残部がFeおよび不可避的不純物、 からなるオーステナイト系ステンレス鋼のビレット、ブ
ルーム、中空素管を、800〜1300℃の温度域で均
熱したのち、ロールに対する冷却水をミストノズルから
噴霧させ、かつ/またはロール表面の余剰冷却水をワイ
パーにより除去する傾斜ロール式圧延機を用い、穿孔ま
たは延伸することを特徴とする継目無ステンレス鋼管の
製造方法。 △[Ni]=%Ni+0.5%Mn+30(%C+%N
)+8.2−1.1(%Cr+%Mo+1.5%Si+
0.5%Nb)≧−2.0・・・(1)式 2 成分範囲が、重量%で、 C:0.5%以下、Si:0.1〜5.0%、Mn:0
.1〜5.0%、Cr:10〜50%、Ni:3〜50
%、Mo:1.0〜5.0%、S:0.01%以下、P
:0.03%以下、O:0.03%以下、N:0.01
〜0.25%、各元素の含有量が下記(1)式を満足さ
せ、さらに、希土類元素、Ca,Bを1種または2種以
上を0.0010〜0.3%、残部がFeおよび不可避
的不純物、からなるオーステナイト系ステンレス鋼のビ
レット、ブルーム、中空素管を、800〜1300℃の
温度域で均熱したのち、ロールに対する冷却水をミスト
ノズルから噴霧させ、かつ/またはロール表面の余剰冷
却水をワイパーにより除去する傾斜ロール式圧延機を用
い、穿孔または延伸することを特徴とする継目無ステン
レス鋼管の製造方法。 △[Ni]=%Ni+0.5%Mn+30(%C+%N
)+8.2−1.1(%Cr+%Mo+1.5%Si+
0.5%Nb)≧−2.0・・・(1)式
[Claims] 1 Component range in weight%: C: 0.5% or less, Si: 0.1 to 5.0%, Mn: 0
.. 1-5.0%, Cr: 10-50%, Ni: 3-50
%, Mo: 1.0 to 5.0%, S: 0.01% or less, P
: 0.03% or less, O: 0.03% or less, N: 0.01
~0.25%, furthermore, the content of each element satisfies the following formula (1), and the balance is Fe and unavoidable impurities. After soaking in the temperature range of ℃, perforation or stretching is performed using an inclined roll rolling mill that sprays cooling water onto the rolls from a mist nozzle and/or removes excess cooling water on the roll surface with a wiper. A method for manufacturing seamless stainless steel pipe. △[Ni]=%Ni+0.5%Mn+30(%C+%N
)+8.2-1.1(%Cr+%Mo+1.5%Si+
0.5%Nb)≧-2.0...(1) Formula 2 The component range is in weight%: C: 0.5% or less, Si: 0.1 to 5.0%, Mn: 0
.. 1-5.0%, Cr: 10-50%, Ni: 3-50
%, Mo: 1.0 to 5.0%, S: 0.01% or less, P
: 0.03% or less, O: 0.03% or less, N: 0.01
~0.25%, the content of each element satisfies the following formula (1), and 0.0010~0.3% of one or more rare earth elements, Ca, and B, and the balance is Fe and After soaking billets, blooms, and hollow tubes of austenitic stainless steel containing unavoidable impurities in a temperature range of 800 to 1,300°C, cooling water for the rolls is sprayed from a mist nozzle and/or the roll surface is heated. A method for manufacturing a seamless stainless steel pipe, which comprises perforating or stretching the pipe using an inclined roll rolling mill that removes excess cooling water using a wiper. △[Ni]=%Ni+0.5%Mn+30(%C+%N
)+8.2-1.1(%Cr+%Mo+1.5%Si+
0.5%Nb)≧−2.0...Equation (1)
JP2195965A 1990-07-24 1990-07-24 Manufacturing method of seamless stainless steel pipe Expired - Lifetime JP2590595B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2195965A JP2590595B2 (en) 1990-07-24 1990-07-24 Manufacturing method of seamless stainless steel pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2195965A JP2590595B2 (en) 1990-07-24 1990-07-24 Manufacturing method of seamless stainless steel pipe

Publications (2)

Publication Number Publication Date
JPH0481209A true JPH0481209A (en) 1992-03-13
JP2590595B2 JP2590595B2 (en) 1997-03-12

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4624514B2 (en) * 1999-01-26 2011-02-02 エスエムエス・ジーマーク・アクチエンゲゼルシャフト 2-roll inclined rolling piercer and method for producing hollow shell from high alloy steel
CN102251196A (en) * 2011-07-22 2011-11-23 江苏联兴成套设备制造有限公司 Wear-resistant relieved tooth prepared from high-strength alloy steel
JP2012200764A (en) * 2011-03-25 2012-10-22 Sumitomo Metal Ind Ltd Ehrhardt piercing method
EP2839890A4 (en) * 2012-04-18 2015-11-25 Nippon Steel & Sumitomo Metal Corp Round billet for seamless metal tube and method for producing seamless metal tube

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4624514B2 (en) * 1999-01-26 2011-02-02 エスエムエス・ジーマーク・アクチエンゲゼルシャフト 2-roll inclined rolling piercer and method for producing hollow shell from high alloy steel
JP2012200764A (en) * 2011-03-25 2012-10-22 Sumitomo Metal Ind Ltd Ehrhardt piercing method
CN102251196A (en) * 2011-07-22 2011-11-23 江苏联兴成套设备制造有限公司 Wear-resistant relieved tooth prepared from high-strength alloy steel
EP2839890A4 (en) * 2012-04-18 2015-11-25 Nippon Steel & Sumitomo Metal Corp Round billet for seamless metal tube and method for producing seamless metal tube
US10894278B2 (en) 2012-04-18 2021-01-19 Nippon Steel Corporation Method for producing seamless metal tube

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