Heat treatment of seamless steel pipe refers to a seamless steel pipe thermal processing process that changes the chemical composition and organization of the surface or interior of the seamless steel pipe to obtain the required properties by means of heating, heat preservation and cooling.

The tensile test is to make a seamless steel pipe into a sample, pull the sample to fracture on a tensile testing machine, and then measure one or several mechanical properties.

The small and medium diameter ERW electric welded pipe mainly adopts the continuous roll forming method, and also adopts the row roll forming method

Steel sheet pile is a kind of section steel with lock. Its section has straight plate shape, groove shape and Z shape, etc., and there are various sizes and interlocking forms. The common ones are Larson type, Lackawanna type and so on. Its advantages are: high strength, easy to drive into hard soil; it can be constructed in deep water, and if necessary, it can be added with oblique supports to form a cage. Good waterproof performance; cofferdams of various shapes can be formed according to needs, and can be reused many times, so it has a wide range of uses.

Oil well pipe (OCTG pipe), also known as oil special pipe, is a kind of steel pipe specially used for oil and natural gas exploitation. Most of them are seamless pipes, but welded pipes also account for a considerable proportion.

Steel sheet piles can be divided into: hot-rolled (stretched) steel sheet piles and cold-formed steel sheet piles according to different processing and manufacturing processes.According to the shape, it can be divided into: U-shaped steel sheet pile, Z-shaped steel sheet pile, L/S-shaped steel sheet pile, and linear steel sheet pile.