Teach you how to identify the quality of steel pipes

When using 20G high-pressure boiler tubes, they are often subjected to high temperature and pressure conditions, and the tubes will undergo oxidation and corrosion under the action of high-temperature flue gas and water vapor. Steel pipes are required to have high durability, high resistance to oxidation and corrosion, and good structural stability. High pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air ducts, main steam tubes, etc. for high-pressure and ultra high pressure boilers. The rapid development of the market has brought us convenience, but if you lack a pair of discerning eyes when purchasing steel pipes, it is very likely that you will buy inferior products. Today, I will introduce to you the method of identifying steel pipes.

1. Counterfeit and inferior steel pipes are prone to folding (meaning: folding a part of an object), which refers to various folds formed on the surface of the steel pipe. This defect often runs through the longitudinal direction of the entire product. The 20G high-pressure boiler tube has strict requirements for the steel grade used in the manufacture of steel pipes. When using 20G high-pressure boiler tubes, they are often subjected to high temperature and pressure conditions, and the tubes will undergo oxidation and corrosion under the action of high-temperature flue gas and water vapor. Steel pipes are required to have high durability, high resistance to oxidation and corrosion, and good structural stability. High pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air ducts, main steam tubes, etc. for high-pressure and ultra high pressure boilers. The reason for folding (meaning: folding a part of an object) is due to the pursuit of production by counterfeit manufacturers, resulting in the production of ears. The next rolling process produces folding (meaning: folding a part of an object), and the folded (meaning: folding a part of an object) product will crack after bending, reducing the strength of the steel.

2. The surface of fake and inferior steel pipes is prone to scarring, which is due to uneven material and high impurities; The equipment is simple and easy to stick to steel, and these impurities can easily cause scarring when they bite the rolling mill.

3. The surface of inferior materials is prone to cracking due to the fact that the raw material is adobe, which has many pores. During the cooling process, adobe is subjected to thermal stress, resulting in cracks that appear after rolling. The steel used for the pressure components of the 20G high-pressure boiler tubes is generally used in boilers weighing less than 39 kilograms. In order to be used at higher pressures, the heating surface tubes are often designed to be very thick. In order to reduce thermal resistance and save steel, ensure the safety of steel used in high or high-pressure boilers, and also to reduce steel consumption, 16MnG is commonly used. There are also special steels with added rare earth elements, magnesium and other metallic and non-metallic materials. This will improve the performance of boiler steel, reduce steel consumption, and also lower thermal resistance.

4. Fake and inferior steel pipes often have a rough surface on the outside. Matte surface is a defect caused by severe groove wear (a basic type of component failure), which results in irregular unevenness on the surface of steel and is also prone to scratching.