JPH04339567A - Cutting method for austenitic stainless steel - Google Patents
Cutting method for austenitic stainless steelInfo
- Publication number
- JPH04339567A JPH04339567A JP14108891A JP14108891A JPH04339567A JP H04339567 A JPH04339567 A JP H04339567A JP 14108891 A JP14108891 A JP 14108891A JP 14108891 A JP14108891 A JP 14108891A JP H04339567 A JPH04339567 A JP H04339567A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- austenitic stainless
- cutting
- zinc
- cutting method
- 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.)
- Withdrawn
Links
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000011701 zinc Substances 0.000 claims abstract description 21
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 21
- 238000003466 welding Methods 0.000 claims abstract description 9
- 239000003973 paint Substances 0.000 claims description 2
- 229910001566 austenite Inorganic materials 0.000 claims 1
- 229910001220 stainless steel Inorganic materials 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 claims 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract description 9
- 239000005977 Ethylene Substances 0.000 abstract description 9
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 238000005482 strain hardening Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Arc Welding In General (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、引張拘束や溶接残留応
力を有しているオーステナイト系ステンレス鋼の切断方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting austenitic stainless steel having tensile restraint and welding residual stress.
【０００２】0002
【従来の技術】火力プラント，化学プラント等には数多
くの部品や配管に、オーステナイト系ステンレス鋼を採
用しており、これら部品や配管は、定期的又はトラブル
等により取替えを要する場合があるが、従来、オーステ
ナイト系ステンレス鋼の切断は、エチレンガスバーナに
よる溶断や金切り鋸，グラインダーによる切削方法を用
いている。[Prior Art] Austenitic stainless steel is used for many parts and piping in thermal power plants, chemical plants, etc., and these parts and piping may need to be replaced periodically or due to trouble. Conventionally, austenitic stainless steel has been cut by fusing with an ethylene gas burner, cutting with a hacksaw, or using a grinder.
【０００３】しかしながら、オーステナイト系ステンレ
ス鋼は耐腐食，耐高・低温にすぐれた材料であるが、反
面材質的には融点が１４００〜１４５０℃と高く、また
加工硬化を生ずる特徴を有しており、このためエチレン
ガスバーナによる溶断では、切断部の温度が融点に達す
るのに長時間を要し、従って厚肉材の溶断にはエチレン
ガスバーナは不適当であり、また金切り鋸やグラインダ
ー等のような機械的切削方法では、加工硬化の影響を受
け切削に長時間を要する不具合がある。However, although austenitic stainless steel is a material with excellent corrosion resistance and resistance to high and low temperatures, it has a high melting point of 1400 to 1450°C and is also characterized by work hardening. For this reason, when cutting with an ethylene gas burner, it takes a long time for the temperature of the cut part to reach the melting point, and therefore, the ethylene gas burner is not suitable for cutting thick materials, and it also requires a long time to reach the melting point. Mechanical cutting methods have the disadvantage that cutting takes a long time due to the effects of work hardening.
【０００４】ところで、一方、オーステナイト系ステン
レス鋼の加工された部品や配管は、一般に引張拘束や溶
接残留応力を有しているので、これらの現象を利用して
新しい切断方法はなかろうかと考えられる。By the way, parts and piping machined from austenitic stainless steel generally have tensile restraint and welding residual stress, so it is thought that there may be a new cutting method that takes advantage of these phenomena.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、このような
事情に鑑みて提案されたもので、エチレンガスバーナで
の長時間加熱の必要性や加工硬化の影響もなく、短時間
でしかも格別の装置設置を必要とせず容易かつ的確にオ
ーステナイト系ステンレス鋼を切断することができるオ
ーステナイト系ステンレス鋼切断方法を提供することを
目的とする。[Problems to be Solved by the Invention] The present invention has been proposed in view of the above circumstances, and there is no need for long-term heating with an ethylene gas burner and there is no effect of work hardening, and it is possible to achieve exceptional results in a short period of time. An object of the present invention is to provide an austenitic stainless steel cutting method that can easily and accurately cut austenitic stainless steel without requiring installation of equipment.
【０００６】[0006]
【課題を解決するための手段】そのために本発明は、引
張拘束や溶接残留応力を有しているオーステナイト系ス
テンレス鋼の切断線上に亜鉛板又は亜鉛を多量に含有す
る塗装剤を載せ、次いで上記切断線上を７５０℃以上に
加熱しオーステナイト系ステンレス鋼の亜鉛脆化現象を
用いて切断することを特徴とする。[Means for Solving the Problems] In order to solve the problem, the present invention places a zinc plate or a coating agent containing a large amount of zinc on the cutting line of austenitic stainless steel that has tensile restraint and welding residual stress, and then It is characterized by heating the cutting line to 750° C. or higher and cutting using the zinc embrittlement phenomenon of austenitic stainless steel.
【０００７】[0007]
【作用】本発明オーステナイト系ステンレス鋼切断方法
は、オーステナイト系ステンレス鋼の引張拘束や溶接残
留応力を利用して切断を行うものであり、溶融した亜鉛
がオーステナイト系ステンレス鋼の結晶粒界に浸入して
行き引張拘束や残留応力により割れを生じ、すなわち亜
鉛脆化現象を生じて切断が行われる。[Function] The austenitic stainless steel cutting method of the present invention utilizes the tensile restraint and welding residual stress of the austenitic stainless steel to cut the austenitic stainless steel. As a result, cracks occur due to tensile restraint and residual stress, that is, zinc embrittlement occurs, and cutting is performed.
【０００８】[0008]
【実施例】本発明オーステナイト系ステンレス鋼切断方
法をオーステナイト系ステンレス鋼管の切断に適用した
一実施例を図面について説明すると、図１はオーステナ
イト系ステンレス鋼管の加熱中の状態を示し、同図（Ａ
）は部分截断の正面図、同図（Ｂ）は同図（Ａ）のＢ部
の拡大図、図２は加熱後の状態を示し、同図（Ａ）は部
分截断の正面図、同図（Ｂ）は同図（Ａ）のＢ部の拡大
図である。[Example] An example in which the austenitic stainless steel cutting method of the present invention is applied to cutting an austenitic stainless steel pipe will be explained with reference to the drawings.
) is a front view of a partially cut section, (B) is an enlarged view of part B of the same figure (A), FIG. 2 shows the state after heating, and (A) is a front view of a partially cut section, (B) is an enlarged view of part B of the same figure (A).
【０００９】まず図１において、直径１１０ｍｍ，厚さ
２０ｍｍのオーステナイト系ステンレス鋼管１の、引張
拘束や溶接残留応力を有している円周溶接継手部２の片
側溶接トウ部に沿って、巾３ｍｍ，厚さ５ｍｍの帯状亜
鉛板３を全周に設けるとともに、７５０℃以上に加熱す
ると変色する温度チョーク４をも付着させておき、この
温度チョーク４で管理しながら、帯状亜鉛板３をエチレ
ンガスバーナ５で温度が７５０℃以上になるように局部
的に加熱すると、７５０℃以上に加熱された帯状亜鉛板
３は溶融し、この溶融亜鉛板３′はオーステナイト系ス
テンレス鋼管１の結晶粒界６に浸入して行く。First, in FIG. 1, a 3 mm wide austenitic stainless steel pipe 1 with a width of 3 mm is attached along one side weld toe of a circumferential weld joint 2 which has tensile restraint and welding residual stress. , A strip zinc plate 3 with a thickness of 5 mm is provided around the entire circumference, and a temperature chalk 4 that changes color when heated to 750° C. or higher is also attached.While controlling the temperature with the temperature chalk 4, the strip zinc plate 3 is placed in an ethylene gas burner. When locally heated to a temperature of 750°C or higher in Step 5, the strip-shaped zinc plate 3 heated to 750°C or higher melts, and this molten zinc plate 3' is attached to the grain boundaries 6 of the austenitic stainless steel pipe 1. Infiltrate.
【００１０】しかして、完全に溶融した溶融亜鉛板３′
は、図２に示すように、オーステナイト系ステンレス鋼
管１の外周面から内周面まで結晶粒界６に浸入するため
、この部分は著しく脆化し、円周溶接継手部２の引張拘
束や溶接残留応力によって容易に割れを発生し、結局破
断するに至る。[0010] Thus, the completely melted molten zinc plate 3'
As shown in FIG. 2, this penetrates into the grain boundaries 6 from the outer circumferential surface to the inner circumferential surface of the austenitic stainless steel pipe 1, resulting in significant embrittlement in this area, resulting in tensile restraint in the circumferential weld joint 2 and welding residue. It easily cracks due to stress and eventually breaks.
【００１１】かくしてこの切断方法によれば、オーステ
ナイト系ステンレス鋼管１の亜鉛脆化現象を逆手に利用
してその切断を行うので、エチレンガスバーナ５での長
時間加熱の必要性がなく、短時間で容易かつ的確にオー
ステナイト系ステンレス鋼管１を切断することができる
。[0011] According to this cutting method, the zinc embrittlement phenomenon of the austenitic stainless steel pipe 1 is exploited to perform the cutting, so there is no need for long-term heating with the ethylene gas burner 5, and the cutting can be performed in a short time. The austenitic stainless steel pipe 1 can be easily and accurately cut.
【００１２】0012
【発明の効果】要するに本発明によれば、引張拘束や溶
接残留応力を有しているオーステナイト系ステンレス鋼
の切断線上に亜鉛板又は亜鉛を多量に含有する塗装剤を
載せ、次いで上記切断線上を７５０℃以上に加熱しオー
ステナイト系ステンレス鋼の亜鉛脆化現象を用いて切断
することにより、エチレンガスバーナでの長時間加熱の
必要性や加工硬化の影響もなく、短時間でしかも格別の
装置設置を必要とせず容易かつ的確にオーステナイト系
ステンレス鋼を切断することができるオーステナイト系
ステンレス鋼切断方法を得るから、本発明は産業上極め
て有益なものである。In short, according to the present invention, a zinc plate or a paint containing a large amount of zinc is placed on the cutting line of austenitic stainless steel that has tensile restraint and welding residual stress, and then By heating to 750℃ or higher and cutting using the zinc embrittlement phenomenon of austenitic stainless steel, there is no need for long-term heating with an ethylene gas burner or the effects of work hardening, and the equipment can be installed in a short time and with special equipment. The present invention is extremely useful industrially because it provides a method for cutting austenitic stainless steel that can easily and accurately cut austenitic stainless steel without the need for cutting.
【図面の簡単な説明】[Brief explanation of the drawing]
【図１】本発明オーステナイト系ステンレス鋼切断方法
をオーステナイト系ステンレス鋼管の切断に適用した一
実施例における、オーステナイト系ステンレス鋼管の加
熱中の状態を示し、同図（Ａ）は部分截断の正面図、同
図（Ｂ）は同図（Ａ）のＢ部の拡大図である。FIG. 1 shows a state in which an austenitic stainless steel pipe is being heated in an embodiment in which the austenitic stainless steel cutting method of the present invention is applied to cutting an austenitic stainless steel pipe, and FIG. 1 (A) is a front view of a partially cut state. , (B) is an enlarged view of section B in (A) of the same figure.
【図２】同上における加熱後の状態を示し、同図（Ａ）
は部分截断の正面図、同図（Ｂ）は同図（Ａ）のＢ部の
拡大図である。FIG. 2 shows the state after heating in the same as above, and the same figure (A)
1 is a partially cutaway front view, and FIG.
１ オーステナイト系ステンレス鋼管２ 円周溶接
継手部
３ 帯状亜鉛板
３′ 溶融亜鉛板
４ 温度チョーク
５ エチレンガスバーナ
６ 結晶粒界1 Austenitic stainless steel pipe 2 Circumferential weld joint 3 Strip zinc plate 3' Molten zinc plate 4 Temperature choke 5 Ethylene gas burner 6 Grain boundary
Claims (1)
オーステナイト系ステンレス鋼の切断線上に亜鉛板又は
亜鉛を多量に含有する塗装剤を載せ、次いで上記切断線
上を７５０℃以上に加熱しオーステナイト系ステンレス
鋼の亜鉛脆化現象を用いて切断することを特徴とするオ
ーステナイト系ステンレス鋼切断方法。Claim 1: A zinc plate or a paint containing a large amount of zinc is placed on the cut line of austenitic stainless steel that has tensile restraint and welding residual stress, and then the cut line is heated to 750°C or higher to remove austenite. An austenitic stainless steel cutting method characterized by cutting using the zinc embrittlement phenomenon of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14108891A JPH04339567A (en) | 1991-05-16 | 1991-05-16 | Cutting method for austenitic stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14108891A JPH04339567A (en) | 1991-05-16 | 1991-05-16 | Cutting method for austenitic stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04339567A true JPH04339567A (en) | 1992-11-26 |
Family
ID=15283927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14108891A Withdrawn JPH04339567A (en) | 1991-05-16 | 1991-05-16 | Cutting method for austenitic stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04339567A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102423824A (en) * | 2011-10-19 | 2012-04-25 | 四川省达州钢铁集团有限责任公司 | Disassembly method of damaged bridge pipe of coke oven |
-
1991
- 1991-05-16 JP JP14108891A patent/JPH04339567A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102423824A (en) * | 2011-10-19 | 2012-04-25 | 四川省达州钢铁集团有限责任公司 | Disassembly method of damaged bridge pipe of coke oven |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980806 |