Steel sheet piles or sheet pilings are a common auxiliary construction material and are widely used in construction, water conservancy, shipbuilding and other fields.

Schedule 80 black steel pipe refers to a specific type of steel pipe with a high wall thickness and a black finish.

Black steel pipe refers to a type of steel pipe that has not been galvanized or coated with a protective layer.

L80 casing is a grade of steel casing commonly used in the oil and gas industry for constructing wellbore walls during drilling operations. The "L" in L80 stands for "line pipe," while the number designates the minimum yield strength in thousands of pounds per square inch (ksi).

API 5CT K55 steel casing pipe is an important material in the oil drilling and production process and plays an important role in the oil industry.

Sheet pile retaining walls are a common underground engineering structure used to support soil and prevent soil landslides or collapse.