10-Year Experience With T23(2.25Cr-1.6W) and T122(12Cr-0.4Mo-2W) in a Power Boiler

2004 ◽  
Vol 127 (2) ◽  
pp. 190-196 ◽  
Author(s):  
N. Komai ◽  
F. Masuyama ◽  
M. Igarashi
Keyword(s):  
Growth Rate ◽  
Pressure Vessels ◽  
Steam Oxidation ◽  
Steel Tubes ◽  
Remarkable Change ◽  
Field Exposure ◽  
Exposure Test ◽  
Power Boiler ◽  
Oxidation Behaviors ◽  
Oxidation Scale

Tungsten strengthened ferritic steels, 2.25Cr-1.6W-V-Nb and 12Cr-0.4Mo-2W-V-Nb-Cu have been developed and approved by the ASME Boiler and Pressure Vessels Code Committee for use in Section I construction, designated as T23 and T122, respectively. A field exposure test installing both steel tubes in service along with comparative materials in the tertiary superheater and secondary reheater of a 156MW utility power boiler has been conducted since April 1993. The tubes were removed to confirm their material properties and corrosion/steam oxidation behaviors after 1-year, 3-year, 6-year, and 10-year periods of service. The tensile and creep rupture strengths of both steels showed no remarkable change during service. Examination of steam oxidation scale on the inner surface of the tubes indicated that the scale growth rate of T122 was extremely small following 1-year service. The growth rate and morphology of steam oxidation scale is discussed, as compared with conventional materials.

10-Year Experience With T23(2.25Cr-1.6W) and T122(12Cr-0.4Mo-2W) in a Power Boiler

2004 ◽  
Author(s):  
N. Komai ◽  
F. Masuyama ◽  
S. Yamamoto ◽  
M. Igarashi
Keyword(s):  
Growth Rate ◽  
Pressure Vessels ◽  
Steam Oxidation ◽  
Remarkable Change ◽  
Field Exposure ◽  
Exposure Test ◽  
One Year ◽  
Power Boiler ◽  
Oxidation Behaviors ◽  
Oxidation Scale

Tungsten strengthened ferritic steels, 2.25Cr-1.6W-V-Nb and 12Cr-0.4Mo-2W-V-Nb-Cu have been developed and approved by the ASME Boiler and Pressure Vessels Code Committee for use in Section I construction, designated as T23 and T122 respectively. A field exposure test installing both steel tubes in service along with comparative materials in the tertiary superheater and secondary reheater of a 156MW utility power boiler has been conducted since April 1993. The tubes were removed to confirm their material properties and corrosion/steam oxidation behaviors after one-year, 3-year, 6-year and 10-year periods of service. The tensile and creep rupture strengths of both steels showed no remarkable change during service. Examination of steam oxidation scale on the inner surface of the tubes indicated that the scale growth rate of T122 was extremely small following one-year service. The growth rate and morphology of steam oxidation scale is discussed, as compared with conventional materials.

scholarly journals Thermal-Stress Ratchet Mechanism in Pressure Vessels

1959 ◽  
Vol 81 (2) ◽  
pp. 190-194 ◽  
Author(s):  
D. R. Miller
Keyword(s):  
Growth Rate ◽  
Thermal Stress ◽  
Internal Pressure ◽  
Strain Hardening ◽  
Thermal Stresses ◽  
Pressure Vessels ◽  
Progressive Reduction ◽  
Ratchet Mechanism

The combination of cyclic thermal stresses and sustained internal pressure in a vessel is shown to be a source of progressive expansion of the vessel if the stresses are sufficiently high. Criteria presented allow determination of limits to be imposed on stresses in order to prevent progressive expansion or to allow estimation of the expansion per cycle where stresses are sufficient to produce growth. The effect of strain-hardening of the metal on progressive reduction of the growth rate is discussed.

scholarly journals Nitric acid and particulate matter measurements at Athens, Greece, in connection with corrosion studies

2009 ◽  
Vol 9 (21) ◽  
pp. 8309-8316 ◽  
Author(s):  
C. Tzanis ◽  
C. Varotsos ◽  
M. Ferm ◽  
J. Christodoulakis ◽  
M. N. Assimakopoulos ◽  
...  
Keyword(s):  
Test Site ◽  
Water Soluble ◽  
Passive Samplers ◽  
Field Exposure ◽  
Exposure Test ◽  
Corrosion Studies ◽  
Long Time ◽  
The University ◽  
The Vertical Distribution ◽  
The Eu

Abstract. For a long time, scientists have been concerned about the effects of air pollution on materials and especially on the monuments of the cultural heritage. The EU funded a project, entitled MULTI-ASSESS, to determine these effects and to develop dose-response functions appropriate for the new multi-pollutant environment. The University of Athens participated in this effort as a targeted field exposure test site. In the present paper, the measurements of the passive samplers, which were exposed during the same period with the samples for corrosion studies, at the Athens station, are presented. The results have shown that only 16.5% of the deposited mass was water soluble. The vertical distribution of passive particle collectors has led to the conclusion that the height of maximum deposition of each ion is different. In addition, a variation of the water-soluble mass to total deposited mass between 8% and 31% was observed.

scholarly journals 3-Year Experience with 2.25 Cr-1.6 W (HCM2S) and 12Cr-0.4Mo-2W (HCM12A) Steel Tubes in a Power Boiler.

1998 ◽  
Vol 41 (4) ◽  
pp. 1098-1104 ◽  
Author(s):  
Fujimitsu MASUYAMA ◽  
Nobuyoshi KOMAI ◽  
Tomomitsu YOKOYAMA ◽  
Satomi YAMAMOTO ◽  
Kaori MIYATA ◽  
...  
Keyword(s):  
Steel Tubes ◽  
Power Boiler

scholarly journals DIFFERENT BEHAVIORS OF ZINC RICH PAINT AGAINST CORROSION IN ATMOSPHERIC ZONE AND TIDAL ZONE OF INDUSTRIAL PORT ENVIRONMENT

2018 ◽  
Vol 55 (5B) ◽  
pp. 194 ◽  
Author(s):  
Vinh Dat Vuong
Keyword(s):  
High Temperature ◽  
Steel Substrate ◽  
Constructional Steel ◽  
Tidal Zone ◽  
Field Exposure ◽  
Exposure Test ◽  
Environmental Conditioning ◽  
Time Of Wetness

A study on zinc rich paint (ZRP) and its behaviors of protecting JIS SS400 constructional steel against impacts of industrial port environment at Phu My port (Ba Ria - Vung Tau Province, Vietnam) was started in January 2014. After three years of investigation, thickness of ZRP decreased slowly and the reduction reached to 38 µm and 31 µm in atmospheric and tidal zone, respectively. Moreover, in accelerated environmental conditioning tests, separation and failures of ZRP from steel substrate were responsible for blistering. By comparison of field exposure test and accelerating test, growth of blistering on ZRP is caused by high temperature and time of wetness.

Exploring the high-temperature steam oxidation behaviors of the lean-Cr (7-10 wt.%) FeCrAl alloys

2021 ◽  
pp. 109927
Author(s):  
Guang Chen ◽  
Hongyan Yang ◽  
Hongying Sun ◽  
Fu Wang ◽  
Hui Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Steam Oxidation ◽  
Fecral Alloys ◽  
High Temperature Steam ◽  
Oxidation Behaviors

Simulation on the Thermal Stress of Super304H Oxidation Scale at 600°C

2014 ◽  
Vol 1065-1069 ◽  
pp. 1934-1938 ◽  
Author(s):  
Jun Wei Chen ◽  
Zhen Jiang ◽  
Hao Mu ◽  
Qiang Wan ◽  
Lei Hu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Stress ◽  
Tensile Stress ◽  
Oxide Layer ◽  
Cross Section ◽  
Geometric Model ◽  
Steam Oxidation ◽  
Element Analysis ◽  
Oxidation Scale

In this paper, based on the analysis of cross-section of steam oxidation of Super304H sample at 600°C, thermal stress contours were obtained by using finite element analysis through establishing geometric model and refine meshing. After extracting the stress in the interface of oxide layer and analyzing the thermal stress, it can be found that there exists compressive and tensile stress in the interface between substrate and scale, which is affected by the slope of the interface.

Sign in / Sign up

Export Citation Format

Share Document