Seamless steel pipe is a kind of long steel with hollow section and no seams around it. It is a kind of economic section steel,seamless steel pipe according to the different cross sectional area shape can be divided into round pipe and special-shaped pipe. Using seamless steel pipe to manufacture ring parts can improve the material utilization rate, simplify the manufacturing process, and save the material and processing time. Widely used in manufacturing structural parts and mechanical parts etc.

Seamless steel pipe is a kind of long steel with hollow section and no seams around it. It is a kind of economic section steel,seamless steel pipe according to the different cross sectional area shape can be divided into round pipe and special-shaped pipe. Using seamless steel pipe to manufacture ring parts can improve the material utilization rate, simplify the manufacturing process, and save the material and processing time. Widely used in manufacturing structural parts and mechanical parts etc.

Galvanized square pipe is a hollow square section steel pipe with a square cross-section shape and size made of hot-rolled or cold-rolled galvanized strip or galvanized coil as a blank, cold-bending, and then high-frequency welding. , or a galvanized square and rectangular tube made by hot-dip galvanizing of the cold-formed hollow steel pipe made in advance.

Galvanized square pipe is a hollow square section steel pipe with a square cross-section shape and size made of hot-rolled or cold-rolled galvanized strip or galvanized coil as a blank, cold-bending, and then high-frequency welding. , or a galvanized square and rectangular tube made by hot-dip galvanizing of the cold-formed hollow steel pipe made in advance.

Galvanized square pipe is a hollow square section steel pipe with a square cross-section shape and size made of hot-rolled or cold-rolled galvanized strip or galvanized coil as a blank, cold-bending, and then high-frequency welding. , or a galvanized square and rectangular tube made by hot-dip galvanizing of the cold-formed hollow steel pipe made in advance.

Galvanized square pipe is a hollow square section steel pipe with a square cross-section shape and size made of hot-rolled or cold-rolled galvanized strip or galvanized coil as a blank, cold-bending, and then high-frequency welding. , or a galvanized square and rectangular tube made by hot-dip galvanizing of the cold-formed hollow steel pipe made in advance.

Galvanized square pipe is a hollow square section steel pipe with a square cross-section shape and size made of hot-rolled or cold-rolled galvanized strip or galvanized coil as a blank, cold-bending, and then high-frequency welding. , or a galvanized square and rectangular tube made by hot-dip galvanizing of the cold-formed hollow steel pipe made in advance.

Welded steel pipe, also known as welded pipe, is made of steel plate  or strip steel after crimping. The production process of welded steel pipe is simple, the production efficiency is higher, the cost is more lower, the product variety is getting richer, but the general strength is lower than seamless steel pipe.
Welded steel pipe according to the welding process is divided into furnace welded pipe, electric welding (resistance welding) pipe and automatic arc welding pipe, according to the welding form is divided into straight seam welded pipe and spiral welded pipe, according to the end shape is divided into round welded pipe and special-shaped (square, flat, etc.) welded pipe. According to usage, it is divided into general welded pipe, galvanized welded pipe, oxygen blown welded pipe, wire bushings, metric welded pipe, roller pipe, deep well pump pipe, automobile pipe, transformer pipe, thin-wall welded pipe, special-shaped welded pipe and spiral welded pipe. Because of the different welding methods, there are different methods of producing welded steel tubes. The application of welded pipe is mainly used in boilers, automobiles, ships, light construction structure of doors and Windows steel, furniture, various agricultural machinery, scaffolding, wire pipe, high-rise shelves, containers and so on.

Galvanized pipe is to make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot-dip galvanizing is to pickle the steel pipe first. In order to remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned in the tank of ammonium chloride or zinc chloride aqueous solution or mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to the in the hot dip bath. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.