Jak je uvedena stupeň ocelové trubky zvětrávání?

The grade of weathering steel pipe is generally indicated by "Q+yield point value+NH", such as Q345NH, Q295NH. Among them, Q represents the yield point, the number represents the yield point value, and NH represents weathering. The grade of weathering steel pipe adopts the provisions of the national standard GB/T4171-2008, which consists of "Q+yield strength value+NH". For example, Q355NH represents weathering steel with a yield strength of 355MPa. This type of steel can form a dense oxide layer on the surface by adding alloy elements such as copper, phosphorus, chromium, and nickel, and its atmospheric corrosion resistance is 2-8 times that of Obyčejná uhlíková ocel .