Microbial Corrosion Resistance of Stainless Steels for Marine Energy Installations

2011 ◽  
Vol 347-353 ◽  
pp. 3591-3596 ◽  
Author(s):  
Laura L. Machuca ◽  
Stuart I. Bailey ◽  
Rolf Gubner
Keyword(s):  
Stainless Steel ◽  
Stainless Steels ◽  
316L Stainless Steel ◽  
Microbiologically Influenced Corrosion ◽  
Localized Corrosion ◽  
Good Resistance ◽  
Microbial Corrosion ◽  
Naturally Occurring ◽  
Marine Energy ◽  
Cyclic Potentiodynamic Polarization

A range of stainless steels has been investigated for resistance to microbiologically influenced corrosion in seawater. The corrosion potential was monitored for stainless steel coupons exposed to sterilized seawater and to microbiologically active seawater, which showed the effect of the growth of microorganisms. Cyclic potentiodynamic polarization scans confirmed that 13%Cr stainless steel is very susceptible to localized corrosion under these conditions. 316L stainless steel was also quite susceptible to localized corrosion, whereas 2205 duplex stainless displayed good resistance to localized corrosion. Naturally occurring microorganisms in the seawater were shown to exacerbate the localized corrosion.

UNILOY 430

Alloy Digest ◽  
1982 ◽  
Vol 31 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Elevated Temperature ◽  
Stainless Steels ◽  
Heat Treating ◽  
Storage Tanks ◽  
Good Resistance ◽  
Temperature Performance ◽  
Temperature Scaling

Abstract UNILOY 430 is a medium-chromium (17%) non-hardening, ferritic stainless steel. Of the AISI 400 series stainless steels, Uniloy 430 most nearly resembles the 18% chromium-8% nickel stainless steels in fabrication and service. It has excellent resistance to corrosion and good resistance to elevated-temperature scaling. Its many uses include architectural trim, nitric acid storage tanks and kitchen appliances. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-408. Producer or source: Cyclops.

scholarly journals Effect of Microstructural Bands on the Localized Corrosion of Laser Surface-melted 316L Stainless Steel

CORROSION ◽  
10.5006/3779 ◽  
2021 ◽  
Author(s):  
Yoon Hwa ◽  
Christopher Kumai ◽  
Nancy Yang ◽  
Joshua Yee ◽  
Thomas Devine
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Microscopic Investigation ◽  
Outer Edge ◽  
Chromium Concentration ◽  
Laser Surface ◽  
Localized Corrosion ◽  
Pitting Potential ◽  
Primary Austenite ◽  
Potentiodynamic Anodic Polarization

The localized corrosion of laser surface melted (LSM) 316L stainless steel is investigated by a combination of potentiodynamic anodic polarization in 0.1M HCl and microscopic investigation of the initiation and propagation of localized corrosion. The pitting potential of LSM 316L is significantly lower than the pitting potential of wrought 316L. The LSM microstructure is highly banded as a consequence of the high laser power density and high linear energy density. The bands are composed of zones of changing modes of solidification, cycling between very narrow regions of primary austenite solidification and very wide regions of primary ferrite solidification. Pits initiate in the outer edge of each band where the mode of solidification is primary austenite plane front solidification and primary austenite cellular solidification. The primary austenite regions have low chromium concentration (and possibly low molybdenum concentration), which explains their susceptibility to pitting corrosion. The ferrite is enriched in chromium, which explains the absence of pitting in the primary ferrite regions. The presence of the low chromium regions of primary austenite solidification explains the lower pitting resistance of LSM 316L relative to wrought 316L. The influence of banding on localized corrosion is applicable to other rapidly solidified processes such as additive manufacturing.

Failure analysis of fillet welds with premature corrosion in 316L stainless steel slide gates using constitution diagrams

2020 ◽  
Vol 19 (2) ◽  
pp. 141-148
Author(s):  
Carlos Mauricio Franco-Rendón ◽  
Henry León-Henao ◽  
Álvaro Diego Bedoya-Zapata ◽  
Juan Felipe Santa ◽  
Jorge Enrique Giraldo B.
Keyword(s):  
Stainless Steel ◽  
Failure Analysis ◽  
316L Stainless Steel ◽  
Filler Metal ◽  
Optical Emission ◽  
Localized Corrosion ◽  
Fillet Welds ◽  
Emission Spectrometry ◽  
Metallographic Examination ◽  
Ferrite Number

The service environment of the slide gates may cause localized corrosion at welds. In this work, a failure analysis was conducted to determine the causes of the prematurecorrosion of the fillet welds before the commissioning. According to the contractor, the slide gates were manufactured in ASTM A240 Type 316L stainless steel and welded with GMAW using an ER316LSi filler metal. Test samples of the fillet weld metals were extracted from gates after a preliminary visual inspection. The samples were analyzed using ferrite number measurements, Optical Emission Spectrometry, chemical analysis, metallographic examination and Scanning Electron Microscopy with microanalysis. The analysis of results using the Schaeffler and WRC-92 constitution diagrams showed that the estimatedchemical composition of the filler metal differs with the filler metal specified in the WPS suggesting that an incorrect carbon steel filler metal was used during the construction of the gates

SANDVIK SAF 2304

Alloy Digest ◽  
1987 ◽  
Vol 36 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Heat Treating ◽  
Low Carbon ◽  
Good Resistance ◽  
Temperature Performance ◽  
Resistance To Stress

Abstract SANDVIK SAF 2304 is a duplex (ferritic-austenitic) stainless steel of extra-low carbon content. Its yield strength is about double that of austenitic stainless steels and it has very good resistance to stress-corrosion cracking. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-483. Producer or source: Sandvik.

scholarly journals Accelerated corrosion performance of AISI 316L stainless steel concrete reinforcement used in restoration works of ancient monuments

2018 ◽  
Vol 188 ◽  
pp. 03003 ◽  
Author(s):  
Sofia Tsouli ◽  
Angeliki G. Lekatou ◽  
Evangelos Siozos ◽  
Spyridon Kleftakis
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Salt Spray ◽  
Localized Corrosion ◽  
Corrosion Performance ◽  
Cyclic Polarization ◽  
Accelerated Corrosion ◽  
Before And After ◽  
Ancient Monuments ◽  
Steel Rebars

The accelerated corrosion performance of AISI type 316L stainless steel rebars in solutions simulating concrete exposed to various environments was studied by means of cyclic polarization, before and after a four month salt spray test. B500A structural steel rebars were also tested for comparison reasons. Although 316L showed some susceptibility to localized corrosion during polarization in saturated Ca(OH)2containing 3.5 wt.% NaCl, four months of salt spraying did not significantly affect its polarization behavior. Salt spraying for 4 m did not have any significant effect on the macrostructural state of 316L reinforced concrete.

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