鋼製

1. Origins, structure, and basic meaning

• Structure: 鋼製 is read こうせい and means made of steel. It commonly modifies a noun in the form 鋼製の.
• Basic usage: It can identify a steel door or contrast a steel replacement with an item made from another material.
  • 入口には重い鋼製の扉が取り付けられている。 says that a heavy steel door is installed at the entrance; 木製の棚を鋼製のものに交換した。 describes replacing a wooden shelf with a steel one.

2. Common pitfalls and similar expressions

• 鋼製の扉
  • の links the material description to the following door.
• 鋼製のものに
  • もの stands in for the previously mentioned kind of object and avoids repeating shelf.
• 鋼製 and 木製
  • These terms identify steel and wood as materials; they do not by themselves state an object's size or weight.