Creep Properties of Steels Utilized in High-Pressure and High-Temperature Superheater and Steam Pipe Practice. Part III: Revision of Long-Time Creep Data for a Carbon Steel Header and a Carbon—Molybdenum Steel Pipe

1953 ◽  
Vol 1 (1-12) ◽  
pp. 511-516 ◽  
Author(s):  
R. W. Ridley
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Carbon Steel ◽  
Steel Pipe ◽  
Creep Data ◽  
Creep Properties ◽  
Molybdenum Steel ◽  
Long Time ◽  
Steam Pipe

Creep Properties of Steels Utilized in High-Pressure and High-Temperature Superheater and Steam Pipe Practice. Part I: Carbon Steels

1944 ◽  
Vol 151 (1) ◽  
pp. 54-62 ◽  
Author(s):  
H. J. Tapsell
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Carbon Steels ◽  
Creep Properties ◽  
Molybdenum Steel ◽  
Steam Pipe ◽  
Steam Pipes ◽  
Sufficient Precision ◽  
Creep Strains

This report deals with the creep properties of carbon steels used in superheater headers, superheater tubes, and steam pipes for service at temperatures up to about 480 deg. C. The object of the investigation was to obtain data for the estimation of the stress-temperature relationships for specific creep strains of 0·1–0·5 per cent to occur in 100,000 hours, and these have been obtained with sufficient precision to warrant their acceptance for practical purposes. Similar components in molybdenum steel are under investigation.

Creep Properties of Steels Utilized in High-pressure and High-temperature Superheater and Steam Pipe Practice. Part II: 0·5 per cent Molybdenum Steels

1945 ◽  
Vol 153 (1) ◽  
pp. 181-192 ◽  
Author(s):  
H. J. Tapsell ◽  
R. W. Ridley
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Carbon Steels ◽  
Creep Properties ◽  
Superheater Tube ◽  
Steam Pipe

This report deals with the creep properties of carbon-molybdenum steels in the form of a superheater header, superheater tube, and steam pipe manufactured for service at temperatures above about 450 deg. C. (842 deg. F.). The investigation was carried out in a similar manner to that described in Part I (Proceedings, 1944, vol. 151, p. 54) which dealt with carbon steels and, as in the former case, the object was to obtain data for the estimation of the stress-temperature relationships for from 0·1 to 0·5 per cent creep in various periods up to 100,000 hours. It is considered that the data provide a satisfactory basis for design.

Carbon and Carbon-Moly Steam Pipe After Long-Time Service

1966 ◽  
Vol 88 (1) ◽  
pp. 14-20 ◽  
Author(s):  
J. J. Bodzin ◽  
J. W. Freeman ◽  
I. A. Rohrig
Keyword(s):  
Carbon Steel ◽  
Stress Rupture ◽  
Medium Carbon Steel ◽  
Time Service ◽  
Medium Carbon ◽  
Molybdenum Steel ◽  
Long Time ◽  
Steam Pipe ◽  
Main Steam ◽  
Steel Piping

Medium-carbon steel piping, after about 200,000 hr of service, and carbon–0.5 molybdenum steel piping, after about 150,000 hr of service, have been evaluated to determine the effect of prolonged service on the stress-rupture, creep, tensile, and impact properties of the materials. The carbon steel was in main steam service at 825 F, 600 psi, and the carbon–0.5 molybdenum steel at 900 F and 800 psi. All of the material tested would meet requirements for new piping; the original differences that probably were present in the piping as a result of fabrication or heat-treatment appeared modified as a result of service.

scholarly journals Corrosion of Carbon Steel in Flowing Pure Water under High Temperature and High Pressure Conditions

2000 ◽  
Vol 49 (7) ◽  
pp. 431-436
Author(s):  
Shinya Tachibana ◽  
Akihiro Yabuki ◽  
Masanobu Matsumura ◽  
Kazuo Marugame
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Carbon Steel ◽  
Pure Water

Crystal structures and high-temperature vibrational spectra for synthetic boron and aluminum doped hydrous coesite

2020 ◽  
Author(s):  
Yu Ye ◽  
Yunfan Miao ◽  
Joseph R. Smyth ◽  
Junfeng Zhang
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Single Crystals ◽  
Vibrational Spectra ◽  
Fourier Transformation ◽  
Ambient Pressure ◽  
Al Content ◽  
Al Substitution ◽  
Long Time

<p>Coesite, a high-pressure SiO2 polymorph, has drawn extensive interest from the mineralogical community for a long time. In this study, we synthesized hydrous coesite samples with different B and Al concentrations at 5 and 7.5 GPa (1273 K). The B concentration could be more than 400 B/10<sup>6</sup>Si with about 300 ppmw. H2O, while the Al content can be as much as 1200 ~ 1300 Al/10<sup>6</sup>Si with CH2O restrained to be less than 10 ppmw. Hence, B-substitution may prefer the mechanism of Si<sup>4+</sup> = B<sup>3+</sup> + H<sup>+</sup>, whereas Al-substitution could be dominated by 2Si<sup>4+</sup> = 2Al<sup>3+</sup> + O<sub>V</sub>. The doped B<sup>3+</sup> and Al<sup>3+</sup> cations may be concentrated in the Si1 and Si2 tetrahedra, respectively, and make noticeable changes in the Si-O4 and Si-O5 bond lengths. In-situ high-temperature Raman and Fourier Transformation Infrared (FTIR) spectra were collected at ambient pressure. The single crystals of coesite were observed to be stable up to 1500 K. The isobaric Grüneisen parameters (ϒ<sub>i<em>P</em></sub>) of the external modes (< 350 cm<sup>-1</sup>) are systematically smaller in the Al-doped samples, as compared with those for the Al-free ones, while most of the OH-stretching bands shift to higher frequencies in the high temperature range up to ~ 1100 K</p>

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