peale süsiniku oluliselt omadusi mõjutavaid legeerelemente arvestatavates kogustes sisaldav teras; eristatakse madallegeer- ja kõrglegeerteraseid (vastavalt legeerelemente alla või üle 5 %) (vt madallegeerteras, kõrglegeerteras), a ferrous material which contains alloying elements in substantial amounts other than carbon to modify its properties substantially; classified into low-alloy and high-alloy steels, depending upon less than or more than 5% alloy content (see: low-alloy steel, high-alloy steel)