A consortium consisting of Dow Chemical, Union Pacific and Union Tank Car is collaborating with the Department of Transportation Federal Railroad Administration to develop a more puncture resistant railroad tank car for use in the transportation of hazardous chemicals. New designs and new steels are under consideration for this puncture resistant tank car. Ways to improve the toughness of the currently used TC128 Grade B tank car steel are also being explored. It has been proposed to increase puncture resistance by increasing the Charpy V-notch upper shelf energy. One way to achieve this increased shelf energy is to decrease the sulfur content of the steel and employ sulfide shape control. Currently TC128 Grade B pressure tank car steel limits sulfur to 0.015% max. This work was conducted to look at the Charpy V-notch shelf energy achievable in TC128 Grade B steel with reduced sulfur content (0.006% max) and sulfide shape control. Transverse Charpy V-notch data have been collected from TC128 Grade B plates with sulfur levels ranging from 0.001% to 0.006% that have been calcium treated for shape control. The results are presented and discussed. Consistent with expectations, lowering the sulfur content to 0.006% maximum, and applying calcium treatment for inclusion shape control on the TC 128 Grade B steel, results in a significant increase in the transverse CVN properties. With sulfur levels below 0.003% the longitudinal and transverse CVN impact properties are virtually the same. The transverse upper shelf energy found for the 0.002 to 0.003% sulfur steels is essentially the same as the longitudinal CVN values reported by Kyed et al for a 0.009% S and Hicho and Harne for a 0.010% S TC128 Grade B steel, 620 deg C. The Plate Mill transverse CVN data obtained at -34 deg show a significant improvement in energy absorption values for the 0.002% S or lower TC128 Grade B steels compared to the 0.004% S TC128 Grade B Steel. The average transverse CVN upper shelf energy absorption value found for steels in the 0.002 to 0.003% S range was 209 J, twice that reported by Hicho and Harne for a 0.010% S TC128 Grade B steel.
The influence of sulfur concentration below 0.006% along with sulfide shape control on the charpy V-notch properties of normalized and stress relieved TC128 grade B steel plate
Einfluss von Schwefelgehalten unter 0,006% und einer Einformung der Sulfideinschlüsse auf die Zähigkeit im Spitzkerbschlagversuch von normalisierten und spannungsarmgeglühten Grobblechen der Güte TC128 Grade B
2007
9 Seiten, 5 Bilder, 4 Tabellen, 2 Quellen
Aufsatz (Konferenz)
Englisch
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