lightweight high-manganese (8-28 wt% Mn) steel in which reduced density is mainly realized by adding aluminium (5-12 wt% Al) (see: transformation-induced plasticity, lightweight steel), suure mangaanisisaldusega (8-28 massi% kergteras, mille tiheduse vähenemine tagatakse peamiselt legeerides tavapärasest suuremate alumiiniumi kogustega (5-12 massi%) (vt faasimuutusplastsus, kergteras)