51314-3786-Comparison of the Corrosion Resistance to Dangerous Goods of Austenitic Crnimo and Duplex Steels

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Product Number: 51314-3786-SG

ISBN: 3786 2014 CP

Author: Margit Weltschev

Publication Date: 2014

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The “BAM-List – Requirements for Tanks for the Transport of Dangerous Goods” is the basis in Germany for substance-related prototype approvals for tank containers by the BAM - Federal Institute for Materials Research and Testing. Compatibility evaluations of selected metallic materials and polymeric gasket and lining materials under the influence of approximately 7200 dangerous goods have been published in the BAM-List since 1989. The austenitic CrNi- and CrNiMo-steels - 304L (S30403) 316 (S31600) 316L (S31603) and 316Ti (S31635) – are the materials mostly used steels worldwide for transport tanks. The duplex steel S31803 (X2CrNiMoN 22-5-3) was put into the BAM-List due to the great interest of tank producers and transport companies. The advantage of this steel lies in the combination of the properties: corrosion resistance strength and price. Using S31803 instead of 316L the weight of the tanks can be reduced by 20 % – 25 % and the list of transportable goods can be extended.The objective of these investigations was to compare the corrosion resistance of du-plex steel S31803 against various substances in the current BAM-List in comparison to that of austenitic steel 316L (X2CrNiMo17 12 2). Therefore test specimens of both steels were exposed to selected corrosive substances such as formic acid acetic acid phosphoric acid sulfuric acid nitrating acid monochloroacetic acid and trichloroacetone at 55°C (30°C 70°C).The test results have shown that the duplex steel S31803 is a good alternative to austenitic CrNiMo-steel S31603 for tanks carrying corrosive dangerous goods.They are already included in the current edition of the BAM-List.