炼钢 (liàn gāng) literally means 'to refine steel' — 炼 (liàn) means 'to smelt, refine, or purify' through high-heat processing, and 钢 (gāng) means 'steel'. Together, the term refers to the industrial metallurgical process of converting raw iron (often pig iron) into steel by removing excess carbon and impurities, typically using blast furnaces, basic oxygen furnaces, or electric arc furnaces. This is a core step in modern steel production.

The word is used almost exclusively in technical, industrial, and economic contexts — for example, when discussing manufacturing capacity, factory operations, environmental regulations on heavy industry, or infrastructure development. It rarely appears in casual speech but is common in news reports, policy documents, and engineering texts. While 炼 can appear in other compound verbs like 炼铁 (liàn tiě, 'to smelt iron') or 炼油 (liàn yóu, 'to refine oil'), 炼钢 specifically denotes steelmaking and carries strong associations with industrialization and national productivity.