Sigla che indica gli acciai impiegati per laminati a caldo in profilati, barre, larghi piatti, lamiere, tubi, ecc.
Nelle tabelle UNI sono indicati gli acciai: Fe 360 (Fe37), Fe 430 (Fe 44), Fe 510 (Fe 52) nella qualità A, B, C e D. il numero che segue la sigla indica il carico minimo di rottura in N/mmq (kgf/mmq).
Le lettere A, B, C e D indicano, in ordine crescente, l’idoneità alla saldatura. Anche sigla dell’elemento chimico ferro.
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