Do ERW (Electrical Resistance Welded) pipes have a weld seam?
Yes, ERW pipes have a weld seam extending along the length of the pipe. This weld seam is formed by fusing the edges of the flat steel strips, which are formed into the pipe, using a high-frequency current.
What is the difference between A36 and Q235?
A36 is the American standard with a higher minimum yield strength (250 MPa), while Q235 is the Chinese standard with a lower minimum yield strength (235 MPa). Furthermore, because A36 contains copper, it has stronger resistance to atmospheric corrosion, while Q235 does not have this requirement.
What are the uses of Q235 steel?
Q235 steel is a low-carbon structural steel with good weldability, plasticity, and moderate strength. It is widely used in construction fields such as bridges, building frames and structures, as well as in the manufacture of machinery, automotive parts, and general-purpose components such as screws and nuts.
What is the corresponding grade of Q235 in the ASTM standard?
The closest ASTM grade to Chinese Q235 steel is ASTM A36. However, they differ slightly in chemical composition and mechanical properties.
What is the typical service life of ERW welded pipe?
The typical service life of ERW welded pipe is usually 10 to 20 years, but this can vary significantly depending on environmental conditions, operating conditions, and product quality. For example, due to the additional corrosion protection of the zinc coating, hot-dip galvanized ERW welded pipe can have a longer service life, reaching 30 to 100 years.
