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.

Stainless steel pipe is a hollow elongated round steel material, which is widely used in petroleum, chemical, medical, food, light industry, mechanical instrumentation and other industrial pipelines and mechanical structural components. In addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used as furniture and kitchen utensils.

The method of using acid solution to remove scale and rust on the surface of seamless steel pipes is called seamless pipe pickling, which is a method of cleaning the surface of steel pipes.

The welded pipe is a steel pipe made of steel plate or strip steel after being crimped and welded, generally with a length of 6 meters. The production process of welded steel pipe is simple, the production efficiency is high, there are many varieties and specifications, and the investment in equipment is small, but the general strength is lower than that of seamless steel pipe. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes (SSAW steel pipe) according to the form of welds. Classification by production method: process classification - arc welded pipe, electric resistance welded pipe (ERW pipe), (high frequency, low frequency) gas welded pipe, furnace welded pipe.

The hot-dip galvanizing of seamless steel pipes is to pickle the steel pipes first, in order to remove the iron oxide on the surface of the steel pipes. After pickling, it is cleaned in an ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to a hot-dip coating tank. Hot-dip galvanized seamless pipe has the advantages of uniform coating, strong adhesion and long service life.