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A320 L7 versus A320 LF7

A320 L7 versus A320 LF7

A320 L7 versus A320 LF7

(OP)
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.

RE: A320 L7 versus A320 LF7

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

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