Cold-formed steel sheet piles have two types: non-biting cold-formed steel sheet piles (also known as channel plates) and biting cold-formed steel sheet piles (divided into L-shaped, S-shaped, U-shaped and Z-shaped). Production process: The thin sheet (commonly used thickness 8mm ~ 14mm) is continuously rolled and formed in the cold bending unit. Advantages: less investment in the production line, lower production costs, flexible product size control. Disadvantages: the thickness of each part of the pile is the same, the section size cannot be optimized, resulting in the increase of the amount of steel used, the shape of the lock part is difficult to control, the buckle at the connection is not strict, and the water cannot be stopped, and the pile is easy to tear during use