Seamless steel pipes are widely used in petroleum, chemical, boiler and machinery manufacturing industries. In the process of production and use, impurities such as iron oxide, welding slag and grease often accumulate on the surface of the steel pipe. If these impurities are not removed in time, they will not only reduce the surface finish of the steel pipe, but also may affect its corrosion resistance and service life. In order to improve the surface quality and performance of the steel pipe, pickling, passivation and phosphating are often used.

In the process of engineering design and manufacturing, the reasonable selection of piping materials is often very important. The performance and application fields of different piping materials are not the same, stainless steel and carbon steel as two commonly used pipeline materials, each has unique performance and application advantages.

API 5L is an international standard for oil and gas transmission pipes, developed by the American Petroleum Institute (API) and widely used in the oil and gas industry. API 5L seamless steel tube as an important part of the standard, with high strength, good toughness and corrosion resistance, is the ideal choice for the transportation of oil, natural gas and other liquid media.

Cast iron is a traditional material widely used in pipeline engineering. They are favored for their excellent strength, corrosion resistance and cost effectiveness

Coating service is a key link in the production and application of seamless steel pipes. By coating different types of protective coatings, the corrosion resistance, wear resistance and service life of steel pipes can be significantly improved.

Epoxy coating is a common anticorrosive coating that is widely used in various industrial fields, especially in the internal protection of pipelines and storage tanks. Internal epoxy coating is to spray epoxy coating on the inside of the steel pipe, so that the inside of the steel pipe can effectively prevent corrosion.

With the increasing exploitation and utilization of oil and gas, the construction of oil and gas pipelines is becoming more and more important. Because of its high strength, corrosion resistance and good pressure resistance, seamless steel tube has become the main material choice for transmission pipelines in the oil and gas industry, and it is more and more widely used in oil and gas pipelines.

ASTM A36 is a widely used carbon structural steel that meets American Society for Materials and Experimentation (ASTM) standards. ASTM A36 steel plate is widely used in construction, machinery manufacturing and heavy industry because of its high strength, good mechanical properties and easy workability.

Stainless steel is a material widely used in piping systems because of its excellent corrosion resistance, strength and versatility, and is the second most widely used material in the process industry after carbon steel.

Alloy steel has become one of the key materials in modern pipe systems because of its excellent properties and diverse applications. By adding one or more alloying elements on the basis of carbon steel, such as chromium, nickel, molybdenum, vanadium, etc. Alloy steel has higher strength, durability and corrosion resistance, and is widely used in many industries.

Mild steel black pipes has an important position in the field of modern industry and construction, it not only has good weldability and processability, but also has good economic benefits, has a wide range of applications and important position in modern construction, industry, pipeline transportation and other fields, is an economic and practical basic engineering materials.

Carbon steel is a kind of metal material with iron and carbon as the main components, according to the different carbon content is divided into low carbon steel (below 0.25%), medium carbon steel (0.25%-0.60%) and high carbon steel (more than 0.60%). Carbon steel has high strength and durability, is easy to process and weld, and at the same time is low cost, so it has become one of the most commonly used materials in industrial and civil pipeline engineering.

Welded steel pipes can be divided into many types according to the welding process and use, including straight seam submerged arc welded pipe (LSAW) and spiral submerged arc welded pipe (SSAW).

ERW (resistance welded steel pipe) and SSAW (spiral welded steel pipe) are two common types of welded steel pipe.

Seamless steel tube is a kind of high performance industrial material, its quality is affected by many factors.