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A320 Grade L7 - это сталь марки L7 согласно ТУ А320
Цитата из ASTM А320
1.2 Several grades are covered, including both ferritic and
austenitic steels designated L7, B8, etc. Selection will depend
on design, service conditions, mechanical properties, and
low-temperature characteristics. The mechanical requirements
of Table 1 indicate the diameters for which the minimum
mechanical properties apply to the various grades and classes,
and Table 2 stipulates the requirements for Charpy impact
energy absorption. The manufacturer should determine that the
material can conform to these requirements before parts are
manufactured. For example, when Grade L43 is specified to
meet the Table 2 impact energy values at −150°F [−101°C],
additional restrictions (such as procuring a steel with lower P
and S contents than might normally be supplied) in the
chemical composition for AISI 4340 are likely to be required.