鋼鉄|こうてつkoutetsu[0]heiban (flat)

1. nounsteel
   コンクリートは中なかに鋼鉄こうてつの棒ぼうを入いれる事ことで補強ほきょうされる。↗

   Concrete can be reinforced by putting steel bars inside it.

• SynonymスチールCasualColloquial loanword for steel, mostly in compounds like 「スチール缶」; in baseball it also means a stolen base.
• Synonym鋼はがねWrittenWritten/formal. Native word for steel, synonymous with 「鋼鉄」; can also mean a sword, and figuratively great strength, as in 「鋼の意志」.
• Synonym鉄鋼てっこうWrittenWritten/formal. Umbrella term for iron and steel as materials, as in 「鉄鋼業」; leans toward industry and statistics contexts.
• Related鋼材こうざいWrittenWritten/formal. Steel processed into plates, bars, pipes, etc. for construction and machinery; 「鋼鉄」 denotes the metal itself.

Use 「鋼鉄」 for steel as a metal, including the metaphor 「鋼鉄の意志」. For the industry-wide term say 「鉄鋼」, for processed steel products 「鋼材」, for the loanword 「スチール」, and for the native word 「鋼」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 鍛きたえて強つよくした鉄てつ。鋼はがね、はがねと同義どうぎ。
2. 極きわめて硬かたいものや強つよいものの比喩ひゆ