Creep Characteristics and Micro-Defects of Main Steam Pipe Steel at High Temperature

2006 ◽  
pp. 1129-1132
Author(s):  
C.S. Jeong ◽  
Bum Joon Kim ◽  
Byeong Soo Lim
Keyword(s):  
High Temperature ◽  
Pipe Steel ◽  
Creep Characteristics ◽  
Steam Pipe ◽  
Main Steam

Creep Characteristics and Micro-Defects of Main Steam Pipe Steel at High Temperature

2006 ◽  
Vol 326-328 ◽  
pp. 1129-1132
Author(s):  
C.S. Jeong ◽  
Bum Joon Kim ◽  
Byeong Soo Lim
Keyword(s):  
High Temperature ◽  
Void Nucleation ◽  
Early Stage ◽  
Pipe Material ◽  
P92 Steel ◽  
Micro Cracks ◽  
Creep Characteristics ◽  
Martensite Packet ◽  
Steam Pipe ◽  
Main Steam

The initiation and growth of micro-defects such as micro cracks and voids usually causes the failure of long term operated structural components at high temperature. In this study, the creep characteristics and void nucleation and growth characteristics of P92 steel which is used as main steam pipe material in power plant were investigated at several temperatures and loading conditions. The area fraction of void increased with increase of test temperature, stress, and load holding time. In case of internal defect presence, micro-voids initiated in the early stage of loading period and resulted in the increased load line displacement and crack growth rate. The microvoids were found to form along the prior austenite grain boundaries and at the martensite packet boundaries.

Design and Test of an Extensometer for Strain Monitoring of High Temperature Pipelines

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
X. Y. Hu ◽  
J. H. Jia ◽  
N. Wang ◽  
X. M. Xia ◽  
Z. D. Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Power Plant ◽  
Room Temperature ◽  
Design Procedure ◽  
High Accuracy ◽  
Deformation Monitoring ◽  
Strain Monitoring ◽  
Site Monitoring ◽  
Steam Pipe ◽  
Main Steam

In this paper, an extensometer was specifically designed for online deformation monitoring of high temperature pipes and its applicability was verified experimentally. The design procedure and the installation of the extensometer were described in detail. Experiments were carried out to prove the accuracy and the reliability of the extensometer. The laboratory test at room temperature was performed. The reliability of the extensometer at high temperature was validated by on-site monitoring of the deformation of a main steam pipe operating at 540 °C in a power plant. It was demonstrated that the designed extensometer has a high accuracy and an excellent reliability for measurement of the deformation of the high temperature pipes.

Flux creep characteristics in high‐temperature superconductors

1990 ◽  
Vol 56 (7) ◽  
pp. 680-682 ◽  
Author(s):  
E. Zeldov ◽  
N. M. Amer ◽  
G. Koren ◽  
A. Gupta ◽  
M. W. McElfresh ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Flux Creep ◽  
Creep Characteristics

Factors Affecting Choice of Working Stresses for High-Temperature Service

1933 ◽  
Vol 1 (3) ◽  
pp. 99-102
Author(s):  
P. G. McVetty
Keyword(s):  
High Temperature ◽  
Published Data ◽  
Creep Tests ◽  
Fundamental Study ◽  
Factors Affecting ◽  
Creep Characteristics ◽  
The Stability ◽  
Safe Working

Abstract This paper discusses the various methods which have been proposed to determine safe working stresses for high-temperature service. The question of the stability of alloys during the test and in subsequent service is considered, with particular emphasis upon probable changes in creep characteristics during long exposure to stress and temperature. It is shown that published data in general do not admit of extrapolation, and that attempts to estimate total creep in service from such data are not usually satisfactory. The author stresses the need for more fundamental study of the laws governing creep rather than creep tests of many different materials.

Development of New Alloys with Excellent High Temperature Creep Characteristics of 700°C or More

2007 ◽  
pp. 3076-3081
Author(s):  
Seiichi Muneki ◽  
Hiroshi Okubo ◽  
Hirokazu Okada ◽  
Masaaki Igarashi ◽  
Fujio Abe
Keyword(s):  
High Temperature ◽  
High Temperature Creep ◽  
Temperature Creep ◽  
Creep Characteristics

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.

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