The steel sheet pile is a kind of steel structure with linkages on the edge, and the linkages can be freely combined to form a continuous and compact retaining wall or water retaining wall. Steel sheet piles can be divided into hot-rolled/tensile steel sheet piles and cold-formed steel sheet piles according to their different processing and manufacturing techniques.

Carbon steel pipes are made of steel ingots or solid round steel through perforation into capillary tubes, and then made by hot rolling, cold rolling or cold drawing. According to the production method, carbon steel pipes can be divided into two categories: seamless steel pipes and welded steel pipes. Non-metallic inclusions are non-metallic substances contained in carbon steel pipes that are different from those of the base metal. It destroys the continuity and isotropy properties of the metal matrix.

SSAW steel pipe is a welded steel pipe made of strip steel coil as raw material, extruded at regular temperature, and welded by automatic double-wire double-sided submerged arc welding process. Generally used in welding into pipelines for fluid transportation, metal structures, steel pipe pile, etc. Appearance inspection is a simple and widely used inspection method. It is an important part of the inspection of SSAW pipe products. It is mainly to find defects on the weld surface and dimensional deviations.

The results of the causal analysis of welded steel pipe waste show that the factors affecting the quality of raw materials are mainly three aspects: unstable mechanical properties of steel strips, surface defects of steel strips, and large deviations in geometric dimensions. Therefore, key control should be carried out from these three aspects.

High-pressure alloy seamless steel pipe is a seamless steel pipe mainly used to manufacture high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel for steam boiler pipes with high pressure and above. These boiler tubes work under high temperature and high pressure, and the tubes will be oxidized and corroded under the action of high temperature flue gas and water vapor. Therefore, steel pipes are required to have high durable strength, high oxidation resistance, and good structural stability.

Decarburization of seamless pipe refers to the phenomenon that the carbon content of steel pipe is reduced. Decarburization is easy to occur when the heating temperature of steel pipe is too high or the residence time at high temperature is too long. Sometimes accompanied by severe surface oxidation. Factors affecting steel decarburization include chemical composition of steel material, heating temperature, holding time and gas composition.