Corrosion-fatigue endurance of 09G2S steel with an allowance made for cathodic protection

1989 ◽  
Vol 25 (3) ◽  
pp. 329-331
Author(s):  
A. M. Krokhmal'nyi ◽  
A. G. Khanlarova ◽  
I. N. Zin' ◽  
Ya. M. Nagieva ◽  
A. G. Aliev
Keyword(s):  
Corrosion Fatigue ◽  
Cathodic Protection ◽  
09G2s Steel ◽  
Fatigue Endurance

Flexible Armor Wires: Fatigue Load Frequency Effects and an Accelerated Pitting Methodology

2014 ◽  
Author(s):  
Venkat R. Krishnan ◽  
Stefanie Asher ◽  
Krassimir Doynov ◽  
Yan-Hui Zhang
Keyword(s):  
Corrosion Fatigue ◽  
Fatigue Testing ◽  
Experimental Program ◽  
Work Effort ◽  
Flexible Pipe ◽  
Endurance Tests ◽  
Flexible Risers ◽  
Flexible Armor ◽  
Corrosive Environments ◽  
Fatigue Endurance

Corrosion fatigue in the tensile armor layer is a design consideration for both flexible risers and flowlines offshore. Recently, the industry has experienced a handful of in-service flexible pipe replacements due to corrosion fatigue of armor wires. That experience motivated the work effort summarized herein. This paper presents the preliminary results from an experimental program undertaken by ExxonMobil to evaluate and suggest improvements to the currently established fatigue testing methodology for armor wires in corrosive environments. In particular, the results from a frequency scanning test program for armor wires and a methodology for artificially generating pitted armor wire specimens for fatigue endurance tests are presented.

Evaluation of Corrosion Fatigue Crack Propagation Characteristics of TMCP Steel in Synthetic Seawater under Cathodic Protection

2007 ◽  
Vol 26-28 ◽  
pp. 1145-1148 ◽  
Author(s):  
Won Beom Kim ◽  
Jeom Kee Paik
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Corrosion Fatigue ◽  
Cathodic Protection ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Fatigue Crack Propagation Rate ◽  
Synthetic Seawater ◽  
Corrosion Fatigue Crack

In this research, corrosion fatigue tests using tensile strength of 490MPa TMCP steel were performed in synthetic seawater condition to investigate the corrosion fatigue crack propagation characteristics. The influence of cathodic protection at -800mV vs. SCE on the corrosion fatigue crack propagation behavior was investigated. Relationships between da/dN versus ΔK for the material were obtained by two types of test specimens. In the present study, F(α,β) versus α(= 2a/W) relationship for the CCT specimen was calculated by J integral approach, while that for the CT specimen was determined from ASTM E647. It is found that the fatigue crack propagation rate of TMCP steel in synthetic seawater condition is faster than that in air condition at least twice. Also, it is observed that the fatigue crack propagation rate of steel with cathodic protection is in between those of seawater condition without cathodic protection and air condition.

Corrosion-Fatigue Performance of High-Strength Riser Steels in Seawater and Sour Brine Environments

2011 ◽  
Author(s):  
Stephen J. Hudak ◽  
Guadalupe B. Robledo ◽  
Jeffrey Hawk
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Corrosion Fatigue ◽  
Cathodic Protection ◽  
High Strength Steels ◽  
High Strength ◽  
Fatigue Performance ◽  
Material Strength ◽  
Loading Frequency

Although new high-strength steels have recently been developed to meet the demands of increased reservoir pressures, and sour production fluids, the corrosion-fatigue performance of these new higher-strength materials is largely unknown. The goal of this study was to fill this knowledge gap by generating corrosion-fatigue data in two aggressive environments: 1) a sour production brine, and 2) seawater with cathodic protection. The focus of the current paper is on stress-life (S-N) corrosion-fatigue results in these environments, as well as a baseline air environment. Experiments were performed on five different steels with yield strengths ranging from 848 MPa to 1080 MPa. Prior frequency-scan results based on corrosion-fatigue crack growth rate data demonstrated that not all of these material-environment combinations exhibit a saturation frequency where the detrimental environmental effect approached a constant value as the cyclic loading frequency is decreased. Consequently, S-N tests were performed at different frequencies (0.01 Hz, 0.17 Hz, and 1 Hz), depending on the fatigue life regime, in attempting to match the loading frequencies experienced in service. Corrosion-fatigue occurred at stresses well below the fatigue endurance limit in laboratory air, and cyclic lives in the seawater with cathodic protection environment were found to be 2X to 10X less than those in the baseline air environment, while cyclic lives in the sour brine environment were found to be 30X to 100X less than those in the baseline air environment. In both environments, degradation was greatest at lower stresses in the high cycle fatigue regime. The effect of material strength level had little or no measurable effect on the S-N corrosion-fatigue performance, and the effect of cyclic frequency on the corrosion-fatigue performance was mixed. The S-N response to these two variables differed significantly from recently measured fatigue crack growth kinetics in these same materials that were performed in a companion study. Possible reasons for these differences are discussed.

Effect of polystyrol coatings on the corrosion fatigue resistance of 09G2S steel in sea water

1991 ◽  
Vol 26 (5) ◽  
pp. 595-596
Author(s):  
A. M. Krokhmal'nyi ◽  
I. N. Zin' ◽  
Ya. M. Nagieva ◽  
R. A. Kurbanova
Keyword(s):  
Fatigue Resistance ◽  
Corrosion Fatigue ◽  
Sea Water ◽  
09G2s Steel

scholarly journals Corrosion-fatigue failure of tractor trailers metal materials in aggressive environments

2020 ◽  
Vol 64 (2) ◽  
pp. 45-51
Author(s):  
P. Popovych ◽  
L. Poberezhny ◽  
O. Shevchuk ◽  
I. Murovanyi ◽  
L. Poberezhna ◽  
...  
Keyword(s):  
Ammonium Sulphate ◽  
Fatigue Failure ◽  
Corrosion Fatigue ◽  
Atmospheric Corrosion ◽  
Endurance Limit ◽  
Organic Fertilizer ◽  
Strength Loss ◽  
Mineral Fertilizers ◽  
Joint Influence ◽  
Fatigue Endurance

AbstractThe processes of corrosion-fatigue failure of materials in contact with mineral fertilizers are insufficiently studied. As a result of joint influence of atmospheric corrosion and mechanical loads, about 70 to 80 % of machine parts get out of order, 20 to 25 % of which are failures caused by operating overload due to the strength loss because of atmospheric corrosion. A large part of metal structures of agricultural vehicles used to transport mineral fertilizers is under the direct influence of aggressive environments and dynamic loads that occur during the motion by field roads. Saturated solutions of the most aggressive working environments used in agricultural production, in particular ammonium sulphate and nitrophosphate are investigated to reduce fatigue resistance of ordinary steels groups – St3 and St5 and quality steels – 10 Steel, 15 Steel, 20 Steel, 25 Steel when loaded at all levels. The fatigue endurance limit decreases in comparison with air up to 2.02 times in a solution of ammonium sulphate, and to 2.32 times in a solution of nitrophosphate. In organic fertilizer environments, compared to distilled water, the conditional fatigue endurance limit increased to 9 %. The properties of the given materials as an inhibitor of corrosion-fatigue failure were discovered and proved.

scholarly journals Corrosion Fatigue of Ship-Structural Steel with Cathodic Protection under Intermittent Immersion Condition in Seawater at 60°C

1997 ◽  
Vol 1997 (182) ◽  
pp. 763-774
Author(s):  
Yoichi Kayamori ◽  
Isao Soya ◽  
Jun'ichi Kobayashi ◽  
Hiroshi Ouchi ◽  
Atsushi Seto
Keyword(s):  
Structural Steel ◽  
Corrosion Fatigue ◽  
Cathodic Protection ◽  
Immersion Condition
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