"The plaintiff's expert witness, Dr. David Levinson, a professor of metallurgy at the University of Illinois, Chicago campus, believed that the Loitz gun barrel exploded because of a fatigue failure in response to a normal-pressure shell. In Dr. Levinson's opinion, AISI 1140 modified steel is not a suitable material for use in shotgun barrels. Dr. Levinson stated that the inclusions created by the relatively high sulfur content of that type of steel permit the formation of fatigue cracks, which may eventually cause the barrel to fail under normal pressure loads.
AISI 1140 is better steel than the steel used in most if not all of the older doubles, correct?
