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With regard to traction characteristics, the following categories will be considered:
ferritic or ferrite-perlite grades (predominantly ferrite) ;
perlitic or perlite ferrite grades (predominantly perlite) ;
interstitial-free steels ;
double-phase steels (ferrite-martensite) ;
ferrite-bainite shades.
3.1 Ferritic steels
Ferritic and ferrito-perlitic steels account for a very large proportion of general-purpose steels.
The well-accepted physical law for these steels is the Hall-Petch law ( and ) :
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