Steel pipe seamless steel pipe

  Seamless steel pipe is a kind of round, square and rectangular steel with hollow section and no joints around
Seamless steel pipe is made of steel ingot or solid tube blank through perforation, and then made by hot rolling, cold rolling or cold drawing
Seamless steel pipe has a hollow section and is widely used as a pipeline for conveying fluid
Compared with solid steel such as round steel, the steel pipe has the same bending and torsional strength and is lighter
It is an economic section steel
It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffold used in construction

Purpose of seamless steel pipe 1 Buildings include: most underground pipelines are used for transportation, groundwater is extracted during building construction, boiler hot water transmission, etc

2
Machining, bearing sleeve, machining machinery accessories, etc

3
Electrical: gas transmission, water power generation fluid pipeline

4
Anti static tube of wind power plant, etc

There are two kinds of galvanizing methods for seamless steel pipes: hot dip galvanizing and electro galvanizing
Hot dip galvanizing includes wet method, dry method, lead-zinc method, oxidation-reduction method, etc

The main difference between different hot-dip galvanizing methods is what method is used to activate the pipe surface and improve the galvanizing quality after acid leaching cleaning of steel pipe
At present, dry process and redox process are mainly used in production

The surface of zinc layer of electro galvanizing is very smooth, dense and uniform; Good mechanical properties and corrosion resistance; The zinc consumption is 60% ~ 75% lower than that of hot dip galvanizing
Electro galvanizing has certain technical complexity, but this method must be used for single-sided coating, double-sided coating with different thickness of internal and external surface coating, and thin-walled pipe galvanizing