1.What kind of steel is the main material for mainstream container boxes?
The most common standard dry cargo containers are typically constructed of Corten steel (atmospheric corrosion-resistant steel), commonly known as "weathering steel," for their main components (side panels, roof panels, front end, and doors).
Features: This steel contains alloying elements such as phosphorus, copper, chromium, and nickel. After exposure to the atmosphere, it forms a dense, strongly adherent protective rust layer on its surface, preventing rust from spreading further inwards.
Advantages: Low cost, high strength, and relatively low maintenance requirements (compared to ordinary carbon steel). For land transport and short-term ocean shipping that don't require extreme corrosion protection, weathering steel is a perfectly adequate and economical option.
Appearance: The distinctive, slightly rusty, mottled appearance you see on containers is a characteristic of weathering steel.
2.What are the application scenarios of galvanized coils in special container bodies?
Tank containers: Used to transport liquid cargo such as chemicals and food, they require extremely high internal corrosion protection. Stainless steel or galvanized steel is often used.
Refrigerated containers: Due to long-term exposure to harsh environments with high humidity and alternating hot and cold temperatures, their exterior and internal structures utilize extensive galvanized or galvanized steel sheets to prevent rust. Galvanized steel (55% aluminum, 43.4% zinc, 1.6% silicon) offers better corrosion resistance than pure galvanizing.
Special cargo containers: For example, those transporting moisture-sensitive or contamination-sensitive goods, galvanized steel sheets are also used to ensure a clean and rust-resistant interior.
3.What are the applications of galvanized coils as components of standard containers?
Top/Side Panels: Some manufacturers use galvanized steel for the top and some side panels to enhance corrosion resistance in these areas prone to water accumulation.
Bottom Structural Components: These components, such as the bottom crossbeam and fork channel bottom plate, are susceptible to impact and scratches during loading, unloading, and transportation, which can damage the oxide layer of weathering steel and cause rust. Using galvanized steel provides more reliable "sacrificial anode" protection.
Internal Components: These components include ventilators and some interior lining panels.
External Structural Components: Key load-bearing or moving components, such as the front frame, door frames, door hinges, and lock rods, are also often made of galvanized steel or high-strength steel for increased strength and improved rust resistance.
4.What is the difference between weathering steel and galvanized steel in container applications?
Weathering steel Main application: The main body of a standard dry cargo container
The main use of galvanized steel is special container boxes, as well as structural components and bottom structures of all types of containers.
5.What is the difference between the anti-corrosion principles of weathering steel and galvanized steel?
Weathering steel forms a stable, dense oxide rust layer on its surface to insulate against corrosion.
Galvanized steel's zinc layer acts as a "sacrificial anode" that corrodes preferentially, protecting the underlying steel substrate.