A53 seamless steel pipe is a kind of American standard steel pipe. ASTM A53 gr. B seamless steel pipe is equivalent to domestic 20# steel.
1. Because the corrosion degree of ASTM A53 gr. B seamless steel pipe is not consistent, the pickling time is not strictly controlled, it is easy to cause excessive corrosion or pickling is not in place.
2. The residue of ASTM A53 gr. B seamless steel pipe after pickling is retained in the inner wall of the pipe cavity, which affects the cleanliness of the hydraulic system.
3. The passivation treatment of sodium nitrite and glycerin has poor antirust effect, and has an impact on the adhesion of the coating on the outer wall of the tube. Sodium nitrite does not meet the requirements of environmental protection.
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