Modern companies choose seamless steel pipes
Modern companies choose seamless steel pipes because seamless steel tubes are lighter in raw material, stronger in strength, and more Cold Heading Part Manufacturers olerant than those in lsaw steel pipe. They can withstand higher internal pressures, produce sensitive applications, and can be used in clutter or harsh geological conditions. Use it. However, there are also some drawbacks in the use process, mainly due to the internal and external anti-corrosion work. The first is the problem of external wall anti-corrosion. The quality of the anti-corrosion of the external wall directly affects the service life of the seamless steel pipe.At present, the anticorrosion of the outer wall of China's domestic steel pipes is mainly concealed: the steel pipes are required to be reinforced or extra-reinforced, and some areas use cathodic protection. Common anti-corrosion methods for exterior walls include paints such as petroleum asphalt and epoxy coal tar pitch. The latter is not easily cured at low temperatures, and there are many problems in on-site weld construction. In the past, chlorosulfonated polyethylene was used because of the large amount of solvent., prone to pinholes, anti-breakdown failed, some areas are no longer used.
The anti-corrosion effect of the cathodic protection is better, but because of the method of sacrificial anode selection, the anode must be periodically replaced in the future operation, which increases the operating cost and operation. There are three methods commonly used for the preservation of the inner wall of a seamless steel pipe: anti-corrosion coating, resin mortar and cement mortar. However, there are two problems with the three methods: First, the bond strength between the coating and the steel pipe. Both methods of anti-corrosion coating and resin mortar require the complete derusting of the inner and outer walls of the steel pipe before construction, but this is difficult to achieve. As a result, rust forms part of the source of subsequent delamination and constitutes corrosion and scaling. The second is that most of the steel pipes are welded on-site and are preserved after welding. It can only be carried out manually, and the quality is not easy to control. Because the personnel cannot enter the construction for small-diameter pipes and cannot carry out anti-corrosion treatment work, this also creates the hidden danger of future weld damage.Modern companies choose seamless steel pipes because seamless steel tubes are lighter in raw material, stronger in strength, and more tolerant than those in lsaw steel pipe. They can withstand higher internal pressures, produce sensitive applications, and can be used in clutter or harsh geological conditions. Use it. However, there are also some drawbacks in the use process, mainly due to the internal and external anti-corrosion work. The first is the problem of external wall anti-corrosion. The quality of the anti-corrosion of the external wall directly affects the service life of the seamless steel pipe.At present, the anticorrosion of the outer wall of China's domestic steel pipes is mainly concealed: the steel pipes are required to be reinforced or extra-reinforced, and some areas use cathodic protection. Common anti-corrosion methods for exterior walls include paints such as petroleum asphalt and epoxy coal tar pitch. The latter is not easily cured at low temperatures, and there are many problems in on-site weld construction. In the past, chlorosulfonated polyethylene was used because of the large amount of solvent., prone to pinholes, anti-breakdown failed, some areas are no longer used. The anti-corrosion effect of the cathodic protection is better, but because of the method of sacrificial anode selection, the anode must be periodically replaced in the future operation, which increases the operating cost and operation.
There are three methods commonly used for the preservation of the inner wall of a seamless steel pipe: anti-corrosion coating, resin mortar and cement mortar. However, there are two problems with the three methods: First, the bond strength between the coating and the steel pipe. Both methods of anti-corrosion coating and resin mortar require the complete derusting of the inner and outer walls of the steel pipe before construction, but this is difficult to achieve. As a result, rust forms part of the source of subsequent delamination and constitutes corrosion and scaling. The second is that most of the steel pipes are welded on-site and are preserved after welding. It can only be carried out manually, and the quality is not easy to control. Because the personnel cannot enter the construction for small-diameter pipes and cannot carry out anti-corrosion treatment work, this also creates the hidden danger of future weld damage.
