Cov yeeb nkab steel yog raws nraim li cas nws suab zoo li - yeeb nkab tau ua los ntawm carbon hlau, hlau alloy muaj cov hlau thiab carbon. Cov khoom siv tsis txaus ntseeg, cov yeeb nkab roj carbon siv hauv cov khoom lag luam siv hauv dej zoo li cov khoom siv hluav taws xob zoo li cov txhab, kev xa khoom thiab tshuaj fertilizing. Cov ntsiab lus muaj roj carbon ntau dua muab cov hlau qis dua melting point, ua rau nws ntau malting thiab ruaj thiab zoo dua tuaj yeem faib cua sov.