also: せいこうしょ
noun
steelworks; steel mill; steelmaking plant
Refers to a facility where steel is produced from raw materials or recycled scrap.
この町には大きな製鋼所がある。
There is a large steelworks in this town.
製鋼所で働く労働者たちは、厳しい環境に耐えている。
The workers at the steel mill endure harsh conditions.
製鉄所 is an ironworks or iron mill, focusing on iron production, while 製鋼所 specifically produces steel.
Compound of 製鋼 (seikō, 'steelmaking') + 所 (sho/jo, 'place'). The reading せいこうじょ is a common rendaku variant.