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51318-11311-Effect of n-hexane chloride and acetic acid on the stress corrosion cracking of API 5L X70 steel in ethanol fuel

Picture for Effect of n-hexane chloride and acetic acid on the stress corrosion cracking of API 5L X70 steel in ethanol fuel
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Key agents that cause stress corrosion cracking on API 5L X70 steel in anhydrous fuel ethanol by statistical analysis of chemical analyses data of anhydrous-ethanol samples and data from previous stress corrosion cracking tests.

Product Number: 51318-11311-SG
Author: Celia Aparecida Lino dos Santos / Gutemberg de Souza Pimenta / Zehbour Panossian
Publication Date: 2018
Industry: Pipelines, Tanks, and Underground Systems
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$20.00
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Microalloyed steels are subject to stress corrosion cracking in fuel-grade ethanol according to studies carried out in this last decade. This work identifies the key agents that cause stress corrosion cracking on API 5L X70 steel in anhydrous fuel ethanol by statistical analysis of chemical analyses data of anhydrous-ethanol samples and data from stress corrosion cracking tests previously achieved. For validation of the statistical analysis, slow-strain rate tests were carried out with API 5L X70 steel in analytical-grade anhydrous ethanol contaminated with the compounds identified in the statistical analysis. Tests were also conducted in a simulated solution of anhydrous ethanol, prepared according to ASTM D 4806 standard by replacing the gasoline used as a denaturing agent for aliphatic n-hexane hydrocarbon. The tests were performed under super-dry synthetic air and ultrapure nitrogen atmosphere. The most aggressive medium was the simulated solution with gasoline followed by the simulated solution containing n-hexane, both under a nitrogen atmosphere. The solutions of analytical-grade ethanol contaminated with n-hexane and contaminated with chloride ions were equally aggressive and the solution of analytical-grade ethanol contaminated with acetic acid was the less aggressive one. The nitrogen atmosphere made the analytical-grade ethanol with n-hexane more aggressive when compared with the synthetic-air atmosphere. The presence of n-hexane was as aggressive as the presence of chloride ions.

Key words: ethanol, stress corrosion cracking, API 5L X70 steel, aliphatic hydrocarbons, n-hexane, chloride.

Microalloyed steels are subject to stress corrosion cracking in fuel-grade ethanol according to studies carried out in this last decade. This work identifies the key agents that cause stress corrosion cracking on API 5L X70 steel in anhydrous fuel ethanol by statistical analysis of chemical analyses data of anhydrous-ethanol samples and data from stress corrosion cracking tests previously achieved. For validation of the statistical analysis, slow-strain rate tests were carried out with API 5L X70 steel in analytical-grade anhydrous ethanol contaminated with the compounds identified in the statistical analysis. Tests were also conducted in a simulated solution of anhydrous ethanol, prepared according to ASTM D 4806 standard by replacing the gasoline used as a denaturing agent for aliphatic n-hexane hydrocarbon. The tests were performed under super-dry synthetic air and ultrapure nitrogen atmosphere. The most aggressive medium was the simulated solution with gasoline followed by the simulated solution containing n-hexane, both under a nitrogen atmosphere. The solutions of analytical-grade ethanol contaminated with n-hexane and contaminated with chloride ions were equally aggressive and the solution of analytical-grade ethanol contaminated with acetic acid was the less aggressive one. The nitrogen atmosphere made the analytical-grade ethanol with n-hexane more aggressive when compared with the synthetic-air atmosphere. The presence of n-hexane was as aggressive as the presence of chloride ions.

Key words: ethanol, stress corrosion cracking, API 5L X70 steel, aliphatic hydrocarbons, n-hexane, chloride.

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07574 SCC of Carbon Steel in Fuel Ethanol Service: Effect of Corrosion Potential and Ethanol Processing Source

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ISBN: 07574 2007 CP
Author: Julio G. Maldonado and Narasi Sridhar
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Stress corrosion cracking (SCC) of carbon steel in fuel ethanol service has been observed in an increasing number of failures in the last few years. In the presence of oxygen, all of the samples evaluated in this study produced varying degrees of SCC, except for one of the producer ethanol samples. The reason for the high corrosion potential in this sample is still unknown and more detailed analysis of the sample chemical make-up is needed.

 
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51316-7173-Development of Carbon Steel for Pipe Resistant to Stress Corrosion Cracking in Fuel Grade Ethanol

Product Number: 51316-7173-SG
ISBN: 7173 2016 CP
Author: Itaru Samusawa
Publication Date: 2016
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It is known that carbon steels in Fuel Grade Ethanol (FGE) has pitting corrosion and active path corrosion-type stress corrosion cracking (SCC) susceptibility.  In the current work, susceptibility of pitting and SCC of two types of X52 grade carbon steel were investigated by immersion testing and Slow Strain Rate Testing (SSRT).
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10073 Understanding the Stress Corrosion Cracking of X-65 Pipeline Steel in Fuel-Grade Ethanol

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ISBN: 10073 2010 CP
Author: Xiaoyuan Lou, Di Yang, Lindsey R. Goodman and Preet M. Singh
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