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Phone: 86-18632726278

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The Difference Between Precision Steel Pipe And Seamless Steel Pipe

Precision pipe is a kind of high precision steel pipe material after cold drawing or hot rolling. Because the inner and outer wall of the precision steel tube are free of oxide layer, high pressure without leakage, high precision, high smoothness, cold bending is not deformed, flaring, flattening crack-free and so a little, so mainly used to produce pneumatic or hydraulic components of products such as cylinder or Cylinder, can be seamless, but also welded pipe. The chemical composition of precision steel carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, chromium Cr.

The difference between precision steel pipe and seamless steel pipe

1, the main feature of seamless steel pipe without welding seam, can withstand greater pressure. Products can be very rough cast or cold dial.

2, precision steel tube is the product of recent years, mainly in the hole, the outer wall size has strict tolerances and roughness.

Compared with the traditional pipe, seamless steel pipe lighter raw materials, high strength, good resistance, able to withstand higher internal pressure, the production of sensitive and can be used in messy or poor geological conditions. However, there are drawbacks in the use of the process, mainly internal and external anticorrosion treatment more troublesome. The first is the outer wall of the anti-corrosion, anti-corrosion quality of the outer wall directly affect the service life. At present, the corrosion resistance of the outer wall of the domestic steel pipe is mainly as follows: the concealment type practice, the steel pipes are all required to be reinforced or specially reinforced outer wall anti-corrosion, and the cathodic protection is promoted in some areas. The common method of outer wall anticorrosive coatings such as asphalt, epoxy coal tar pitch, which is not easy to cure at low temperatures, and weld site construction in the lot of problems, in the past is the use of chlorosulfonated polyethylene, because of the large amount of solvent , Prone to pinhole, anti-puncture failed, some areas are no longer used. Cathodic protection on the better corrosion, but the choice is the method of sacrificing the anode, the operation in the future must be regularly replaced anode, increased operating costs and operations.

Then talk about the seamless steel pipe wall treatment methods commonly used in three ways: anti-corrosion coatings, resin mortar, cement mortar. However, there are two problems with the three methods: one is the bond strength between the coating and the steel pipe. On the anti-corrosion coatings and resin mortar two methods require steel pipe inside and outside the wall completely rust to construction, but this is difficult to do. Thus the rust part of the formation of the future source of delamination delamination, corrosion and scaling. Second, most of the steel pipe welding are on-site construction, corrosion after welding. Can only be carried out manually, the quality is not easy to control, and for small diameter pipe, because personnel can not enter the construction, anti-corrosion treatment can not be carried out, which also formed a hidden danger of future weld damage.


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