The Development Of Galvanized Seamless Steel Pipe

By Author: zora li
Total Articles: 2
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Galvanized seamless steel pipe galvanized amount is very little, only 10-50g/m2, its own corrosion resistance is much different than hot-dip galvanized pipe. Regular galvanized pipe manufacturers, the use of cold galvanized pipe for water, gas pipe. The galvanized layer of cold galvanized steel pipe is an electric coating, and the zinc layer is independently layered with the steel pipe matrix. The zinc layer is thin, and the zinc layer is simply attached to the steel tube matrix and easy to fall off. Therefore, its corrosion resistance is poor. In new residential buildings, it is forbidden to use cold galvanized steel pipes as water supply pipes.

1, the development
API seamless steel pipe after pickling, through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank for cleaning, in order to ensure quality, most do not use galvanized (cold plating). Only those small enterprises with obsolete equipment use electrogalvanizing, of course, their price is relatively cheaper. At present, the Ministry of Construction has officially below, eliminate the cold ...
... galvanized pipe with backward technology, the future is not electric galvanized. The molten metal reacts with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot dip galvanized steel pipe is first pickling, in order to remove the iron oxide on the surface of the steel pipe, and then into the hot dip plating tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

2.Process classification

1.Medium and thick plate machine group: It mainly produces wide and thick plate, which is used for the production of straight seam submerged arc welded pipe. The quality of straight seam submerged arc welded pipe is reliable, and it is widely used in the main trunk line of oil and gas high-pressure transportation.

2.Furnace rolling mill: Furnace rolling mill includes a reciprocating roughing mill and a 4-high reciprocating finishing mill. Two hot coiling mills are installed on the transmission lines on both sides of the finishing mill. The output roller table usually includes a laminar cooling system and a coiling station. In the mill, stainless steel stamping elbow pipe fittings on the whole length of the thermal mechanical historical significant changes, especially in micro stamping stainless steel elbow pipe fittings production, will strongly affect the finishing mill on the degree of recrystallization and grain growth and precipitation, and causes the entire stainless steel stamping elbow pipe length on the final microstructure and properties of radical changes

3.Semi-continuous rolling mill: including 1 stand furnace rolling mill and 5 stand finishing mill. On a semi-continuous mill, the hot rolling experienced by a pipe fitting during the finishing run is essentially constant from one end of the pipe fitting to the other. The time between runs on the finishing mill is usually less than 3s.

4, CSP continuous casting and rolling: in CSP production line for containing niobium, vanadium, titanium composite microalloyed low carbon manganese steel, use appropriate controlled rolling and coiling of controlled cooling technology, can ensure that the mechanical properties and microstructure of pipe fittings accords with modern X60 stainless steel stamping elbow technical requirements, conform to the development trend of the modern stainless steel stamping elbow pipe fittings.