A320 L7 versus A320 LF7

[a7992]

What are the differences in the SAE 320 L7 and LF7? Also, I could not find any information on the net using the SAE designation so it might be A 320 grade L7 (versus LF7). If anyone has information on what the F designates that would be great! Our spec says to use the LF7 grade but we aren't sure why.

 

[metengr]

If you refer to the ASTM/ASME A/SA 320-99 material specification, there is no Grade LF7 listed.