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stuartbrookes10 (Automotive) (OP)
1 Aug 06 9:41
In material specification SECC F20, what does the F20 mean?
NickE (Materials)
1 Aug 06 9:44
What standard is SECC from?

What type of material is this?

I love materials science!

stuartbrookes10 (Automotive) (OP)
1 Aug 06 9:51
Hello Nick

I have taken this from a Japanese drawing.

I am based in the UK & have converted SECC to CR4 zintec

Regards Stuart
SolarMechE (Mechanical)
1 Aug 06 13:08
SECC is electrolytic zinc-plated steel as specified in the JIS spec, JIS G 3313.  In a quick read through that spec, however, I did not find anything that would explain your "F20" callout.  If there were an "E" followed by a number, that would refer to the minimum coating mass.  Additionally, there are callouts for temper grade, chemical treatment, etc, but as near as I can tell, none of those use an "F."  You might want to get your own copy of JIS G 3313 to see for yourself.  

Is there any chance that the drawing you took this from is old and could have been writted per an outdated spec?  That would be my only guess since this callout does not make sense per the 2005 spec that I have.
stuartbrookes10 (Automotive) (OP)
2 Aug 06 2:18
My drawing was approved for manufacture February 2004
TVP (Materials)
2 Aug 06 10:15
F20 is meaningless according to JIS G 3313.  As SolarMechE mentioned, E20 would designate the zinc coating thickness requirement.

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