鋼こう鉄てつ製せい

noun which may take the genitive case particle 'no'

made of steel; steel

Used as a no-adjective to describe objects constructed from steel. Common in product descriptions and technical contexts.

• この橋はしは鋼こう鉄てつ製せいです。

  This bridge is made of steel.

• 鋼こう鉄てつ製せいの扉とびらはとても重おもい。

  The steel door is very heavy.