JPS58173451A - Tester for stress corrosion cracking - Google Patents

Abstract

PURPOSE:To subject a tubular test member to a test for stress corrosion cracking in an as-worked state in the manufacture by welding the opening of said member to the opening of a test cylinder provided with a pressure conduit pipe, sealing the other opening hermetically, containing the assembly in a vessel and forcing pressurizing corrosive liquid therein. CONSTITUTION:A blind plate 2 is mounted to the end part 1b of a member 1 consisting of a pipe material 1 to seal said part hermetically, and the member is contained in a test cylinder 3 in the stage of testing said member. The opening end 3a of the cylinder 3 and the end part 1a of the member 1 are joined airtightly by welding 4. Many pieces of such cylinders 3 are manufactured and are placed on the rack in a vessel 6. A pressure conduit pipe 5 is drawn out from each draw-out pipe 10. When corrosive liquid is forced into the vessel through an introducing pipe after a cover 6b is closed, the liquid is filled in the vessel 6 and in the member 1 as well. The outside surface of the member 1 is maintained under the atmospheric pressure through the pipe 5. When a damage arises in the member 1 owing to corrosion, the corrosive liquid penetrates in the member and the pressure is transmitted through the pipe 5 to the outside and is detected with a pressure gage. Thus the test for stress corrosion is made possible in the as- worked state in the manufacture.

Description

【発明の詳細な説明】 空部を有する部材に，応力腐食割れを発生させる試験装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a test device that generates stress corrosion cracking in a member having a cavity.

通常材料鋼種間の腐食雰囲気中での特性を調べる実験手
法として板状に加工した試験，片をＵ字形に曲げ加工し
たり，あるいは板の両端を支持し中央にネジ等により押
し曲げ力を与えたり更に管材から試験片を取る際には管
を英字ＩＩ　ＣＩＩ状に切断しネジ締により曲げ応力を
与える方法等が用いられている。いずれの方法も広く一
般に使われている簡便な方法であるが，製品としての腐
食雰囲気中での特性を調べるのには適していない試験法
である。As an experimental method to investigate the characteristics of steel materials in a corrosive atmosphere, tests are carried out by processing a plate into a U-shape, or by supporting both ends of the plate and applying a pushing bending force to the center using a screw, etc. Furthermore, when taking a test piece from a tube material, a method is used in which the tube is cut into the shape of letters II and CII and a bending stress is applied by tightening screws. Although both methods are widely used and simple, they are not suitable for investigating the characteristics of products in a corrosive atmosphere.

なんとなれば通常製品となると腐食雰囲気中での損傷は
加工を受けた部分や，スキマ（化学物質の濃縮の発生し
易い部分）等に選択的に発生し加工状態を与えたま＼の
試験片を供試する必要がある。しかしながら上記Ｕべ／
ド試験片やＣリ／グ試験片では単純な形状に再加工して
しまうので製品製作時の加工状態は失なわれ。For normal products, damage in a corrosive atmosphere occurs selectively in areas that have been processed and in gaps (areas where chemical substance concentration is likely to occur). It is necessary to test it. However, the above Ube/
In the case of hard test specimens and C rig test specimens, the machining conditions at the time of product manufacture are lost because they are reprocessed into simple shapes.

更に応力の負荷が変位（ネジ締）によっているので長時
間の試験期間中に力が失なわれてしまう恐れが有り試験
法として適さないと言える訳である。Furthermore, since the stress load is due to displacement (screw tightening), there is a risk that the force will be lost during a long test period, making it unsuitable as a test method.

本発明の装置は，端部に開口した中空部を有する部材の
応力腐食割れを試験する装置であつて、一端が開口し上
記部材を収納する試験筒と。The apparatus of the present invention is an apparatus for testing stress corrosion cracking of a member having a hollow portion opened at one end, and includes a test tube having one end open and accommodating the above-mentioned member.

同試験筒の開口と上記部材の開口を密に接合させる手段
と、上記試験筒を収納し腐食流体を圧入される容器とか
らなる応力腐食割れ試験装置であるので、製造時の部材
に与えられた加工状態あるいは構造上の特異性を与えた
ままで、しかも強制変位でなく長時間一定の力が働く高
圧雰囲気下での試験が可能となる。This stress corrosion cracking testing device consists of a means for closely joining the opening of the test tube and the opening of the member, and a container that houses the test tube and into which corrosive fluid is pressurized, so that This makes it possible to perform tests in a high-pressure atmosphere where a constant force is applied over a long period of time, rather than forced displacement, while maintaining the processed state or structural specificity.

以下本発明を第１図および第２図に示す一実施例の装置
について説明する。・ 第１図においてｌは試験対象となる部材であって、実際
に製造されたそのものの管材で、その両端部１ａ、　ｌ
ｂは開口しているが、一方の端部１ｂは盲板２によって
閉じられている。The present invention will be described below with reference to an embodiment of the apparatus shown in FIGS. 1 and 2. - In Fig. 1, l is the member to be tested, which is the actually manufactured pipe material, with both ends 1a and l.
b is open, but one end 1b is closed by a blind plate 2.

３は上記部材ｌを収納する試験筒であって。3 is a test tube that accommodates the above-mentioned member 1.

一端３ａが開口しており１部材１の他方の端部１ａ１１
１１ｉ□ が溶接４により密に接合されている。One end 3a is open and the other end 1a11 of 1 member 1
11i□ are tightly joined by welding 4.

なお５は試験筒３に接続され、上記部材ｌと盲板２とに
よって試験筒３内に形成された密閉空間に連通ずる導圧
管である。Reference numeral 5 denotes a pressure impulse pipe connected to the test tube 3 and communicating with the closed space formed inside the test tube 3 by the member 1 and the blind plate 2.

第２図において、６は容器であって本体６ａと蓋６ｂと
からなシ、複数の試験筒３が棚７に乗せられ収納されて
いる。In FIG. 2, 6 is a container consisting of a main body 6a and a lid 6b, and a plurality of test tubes 3 are placed on a shelf 7 and stored therein.

８は図示しない腐食液タンクにポンプを介して連接され
た導入管であって、蓋６ｂより容器６内に高温の腐食液
を圧入するものである。Reference numeral 8 denotes an introduction pipe connected to a corrosive liquid tank (not shown) via a pump, and is used to pressurize the high temperature corrosive liquid into the container 6 through the lid 6b.

なお９は腐食液の排出管、またｌＯは上記試験筒３に連
通された導圧管を取り出す為の取出管である。Note that 9 is a discharge pipe for the corrosive liquid, and 1O is a take-out pipe for taking out the impulse pipe connected to the test tube 3.

さて、管材よシなる部材１の試験に当っては。Now, regarding the test of member 1, which is a pipe material.

まず第１図に示すように部材１の端部１ｂに盲板２を取
り付けて密閉し、試験筒３の中に入れる。First, as shown in FIG. 1, a blind plate 2 is attached to the end 1b of the member 1, the member 1 is sealed, and the member 1 is placed in a test tube 3.

試験筒３の開口する一端３ａと部材ｌの端部１ａとを溶
接４によシ密に接合するとともに導圧管５を取り付ける
。このようにしてなる試験筒３を多数作り、容器６内に
棚に乗せ、また導圧管５を夫々取出管１０よシ引出す。The open end 3a of the test tube 3 and the end 1a of the member 1 are tightly joined by welding 4, and the impulse pipe 5 is attached. A large number of test tubes 3 are made in this manner, placed on a shelf inside the container 6, and the pressure impulse tubes 5 are each pulled out through the extraction tube 10.

蓋６ｂを閉じた後、腐食液を導入管８よシ圧入すると、
腐食液は容器６内に充填され、また部材１の内面にも充
填される。この時部材ｌの外面は導圧管５を介して大気
圧あるいはその近傍に維持されているので、腐食液の圧
力により部材１にはｐ−ｒ　／　ｔの応力が生じる。（
ｐ：圧力。After closing the lid 6b, press the corrosive liquid into the introduction pipe 8.
The corrosive liquid is filled in the container 6 and also on the inner surface of the member 1. At this time, since the outer surface of the member 1 is maintained at or near atmospheric pressure via the impulse pipe 5, a stress of p-r/t is generated in the member 1 due to the pressure of the corrosive liquid. (
p: pressure.

「：半径、ｔ：板厚） なお、腐食液の圧力はオートクレーブなどにより一定に
保持するようにしておけば、試験期間中一定の応力が部
材１に作用することになる。": radius, t: plate thickness) If the pressure of the corrosive liquid is kept constant using an autoclave or the like, a constant stress will act on the member 1 during the test period.

部材ｌに応力腐食によシ損傷が発生し、その板厚を貫通
すると腐食液は部材ｌと試験筒３の間に流入し、導圧管
５を介して外部に圧力を伝達する。When damage occurs to the member 1 due to stress corrosion and the corrosive liquid penetrates through the thickness of the member 1, it flows between the member 1 and the test tube 3, and transmits pressure to the outside via the impulse pipe 5.

従って、導圧管５の端部に圧力計などを取り付けておけ
は、試験開始から貫通に散るまでの浸漬時間が、その期
間にいちいち容器６から部材１を取り出す事なく計測さ
れる訳である。Therefore, by attaching a pressure gauge or the like to the end of the impulse tube 5, the immersion time from the start of the test to the time of penetration can be measured without taking out the member 1 from the container 6 each time during that period.

また負荷応力は部材ｌの板厚を加減することによっても
、任意に設定することが可能となる。Further, the applied stress can be arbitrarily set by adjusting the thickness of the member 1.

更に部材ｌとのスキマ（化学物質の濃縮の発生し易い部
分）を任意に設定したい場合は、上記盲板２の内側に点
線２′で示す突起を付け、その突起と部材ｌ内壁との間
隙を適宜調整することによって可能である。Furthermore, if you want to arbitrarily set a gap with the member 1 (a part where chemical substance concentration is likely to occur), add a protrusion shown by the dotted line 2' to the inside of the blind plate 2, and adjust the gap between the protrusion and the inner wall of the member 1. This is possible by adjusting as appropriate.

このように本実施例の装置によれば高温高圧の条件で使
用される管を製品製作時の加工状態のままで高温高圧の
液中及びスキマ状の液中で応力腐食割れ試験を行うこと
ができる。As described above, according to the apparatus of this embodiment, it is possible to conduct stress corrosion cracking tests on pipes used under high temperature and high pressure conditions in high temperature and high pressure liquid and in liquid in the form of a gap while maintaining the processed state at the time of product manufacture. can.

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

第１図は本発明の一実施例を示す装置における部材と保
護筒を示した図、第２図は装置の説明図である。 ｌ：部材、　　１ａ４ｂ　：端部、２：盲板、３：試験
筒、３ａニ一端、４：溶接、５：導圧管。 ６：容器、７：棚、８：導入管、９：排出管。 ｌＯ：取出管FIG. 1 is a diagram showing members and a protective tube in an apparatus showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the apparatus. l: member, 1a4b: end, 2: blind plate, 3: test tube, one end of 3a, 4: welding, 5: impulse tube. 6: Container, 7: Shelf, 8: Inlet pipe, 9: Discharge pipe. lO: Take-out tube

Claims (1)

【特許請求の範囲】[Claims] 端部に開口した中空部を有する部材の応力腐食割れを試
験する装置であって、一端が開口し上記部材を収納する
試験筒と、同試験簡の開口と上記部材の開口を密に接合
させる手段と、上記試験筒を収納し腐食流体を圧入され
る容器とからなることを特徴とする応力腐食割れ試験装
置。An apparatus for testing stress corrosion cracking of a member having a hollow portion opened at one end, the test tube having one end open and housing the member, and the opening of the test strip and the opening of the member being closely connected. 1. A stress corrosion cracking test apparatus comprising: a means for accommodating the test tube; and a container in which the test tube is housed and a corrosive fluid is pressurized.