鋼管

1. Origins, structure, and basic meaning

• Structure: Written 鋼管 and read こうかん, it is a hollow cylindrical pipe made of steel for structural or transport uses.
• Basic usage: It appears stacked along a warehouse wall and marked in gray where a model uses it.

2. Common pitfalls and similar expressions

• Pipe rather than solid rod
  • Its steel construction does not change the defining hollow tubular form.