All issues
Volume 28 (1990)
- Issue 6 Pages 276-
- Issue 5 Pages 218-
- Issue 4 Pages 166-
- Issue 3 Pages 114-
- Issue 2 Pages 62-
- Issue 1 Pages 4-
Predecessor
Volume 28, Issue 3
Displaying 1-5 of 5 articles from this issue
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Kunio NARITA1990 Volume 28 Issue 3 Pages 114-123
Published: May 25, 1990
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSEEC aims the completion of European single market until the end of 1992. Necessary European Standards (ENs) have to be established before the date by European standardization bodies of CEN/CENELEC. The extraordinary pressure on rapid drafting ENs is affecting both national and international standardization bodies considerably.
Brief conclusions are as follws;
(1) CEN/CENELEC is working hard to draft necessary ENs with the support of member countries. The work within CEN/CENELEC is less transparent for non-European countries such as USA and Japan.
(2) Coordination between ISO and CEN does not seem satisfactory.
(3) The work of ISO/TC 44 “Welding and allied processes” becomes more and more relying upon the IIW
(4) New IEC/ISO directives are being established and JIS Z 8301 was revised correspondingly.View full abstractDownload PDF (1138K) -
Nobuo MORI, Hiroki TAKAHASHI1990 Volume 28 Issue 3 Pages 124-133
Published: May 25, 1990
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA new high pressure apparatus with cubic-anvil device has been made for researches in solid state physics under hydrostatic condition at low temperatures down to 4.2K. Main parts of it are composed of a cubic-anvil, a high pressure cryostat, and a 250 ton press. It is expected to work at pressures up to 10GPa which is more than 3 times as high as a typical piston-cylinder device. Electrical resistivity and dielectric susceptibility measurements using this apparatus are demonstrated.View full abstractDownload PDF (915K) -
Seinosuke YANO, Yoshihiro OKAMURA, Yoshiyuki WATANABE, Shigeru MIZOGUC ...1990 Volume 28 Issue 3 Pages 134-142
Published: May 25, 1990
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA new sulfide stress cracking (SSC) resistant HT60 steel which has also a high resistance to weld cracking has been developed. A newly developed steel is different from conventional HT6O steels as follows,
(1) lowering [C], removing [B] and adding no [Ni] and [Cu]
(2) strength and toughness are kept mainly by precipitation hardening and a fine ferrite-bainite structure in place of tempered martensite structure
(3) to realize this idea, TMCP technology was fully adopted and cotrolled rolling followed by direct quenching and tempering process was established.
As a result, a newly developed HT60 steel shows an extremely low maximum hardness at heat affected zone, Hvmax≤240, and no SSC while a high stress, 1.0σy, is applied and no weld cracking in the atmosphere 10°C, 90% relative humidity.
This new HT60 steel will be suitable for pressure vessels for LPG, pipelines for oil or natural gases, offshore structures where preheating before welding is difficult and others.View full abstractDownload PDF (4710K) -
Takayasu TAHARA, Tohru ISHIGURO1990 Volume 28 Issue 3 Pages 143-153
Published: May 25, 1990
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSRecently larger and thicker pressure vessels have been required in hydro-treating processes of oil upgrading and synthetic fuel production. In order to meet such tendency, conventional Cr-Mo pressure vessel steels have to be improved in hardenability, design stress intensity and resistance to severe internal environments.
Several enhanced Cr-Mo steels such as 3Cr-1Mo-1/4 V-Ti-B steel and21/4 Cr-1Mo-1/4 V steel have been developed and put into ASTM and ASME Code. The newly developed enhanced Cr-Mo steels have excellent high temperature creep rupture properties, low enough susceptibility to long term degradation at elevated temperature and also sufficient resistance to hydrogen attack and hydrogen embrittlement.
Construction of hydrotreating pressure vessels is properly selected considering vessel integrity, maintainability and manufacturing convenience of large size and heavy wall pressure vessels. The forged ring welded construction may be the most preferable design which meets above requirements. Manufacuring of heavy wall pressure vessels made from enhanced Cr-Mo steels requires stringent heat treatment control and suitable welding materials. Application of enhanced Cr-Mo steels also makes echonomical advantages due to reduction of wall wall thickness and total vessel weights.
Large size hydrotreating reactors made from 3Cr-1Mo-1/4 V-Ti-B steel are now manufacturing in shop under the requirement of ASME Code Section VIII Division 2.View full abstractDownload PDF (2751K) -
Bei-Nan Yang, Akiyoshi ISHIKAWA, Yasuhide ASADA1990 Volume 28 Issue 3 Pages 154-160
Published: May 25, 1990
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSCreep-fatigue tests were conducted with 2 1/4 Cr-1Mo steel at 550°C in air. The results were analyzed with a damage model developed by the authors for an evaluation of the pure creep-fatigue behavior of the steel. The model is composed of the overstress concept and consists of two kinds of damages, that is, the time-independent damage and the time-dependent damage. The environmental effect is included in both damages. The environmental effect increases the time-independent damage, however, it decreases the time-dependent damage.View full abstractDownload PDF (723K)
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