Post-treatment process for cold-rolled seamless steel pipe

Abstract

The present invention provides a post-treatment process for a cold-rolled seamless steel pipe, including the following treatment steps: S1, surface polishing: immersing a cold-rolled seamless steel pipe in an alkaline degreasing agent at a temperature of 60-80 degrees Celsius for 10-15 minutes; continuously grinding the cold-rolled seamless steel pipe with thousand-impellers; and polishing the cold-rolled seamless steel pipe with ultra-fiber belts to complete the polishing process; S2, pickling and passivation: placing the polished cold-rolled seamless steel pipe from S1 into a composite pickling solution; and heating and stirring the solution to complete the pickling and passivation process; S3, rinsing and drying: taking out the pickled and passivated cold-rolled seamless steel pipe from S2; cleaning the pipe; immersing the pipe in deionized water at 50-60 degrees Celsius for 15-20 minutes; and placing the pipe on a drying table for hot air drying for 5 minutes; S4, inner wall cleaning: introducing fluid abrasive particles into the dried cold-rolled seamless steel pipe from S3; and S5, flaw detection and inspection: adopting any one of ultrasonic flaw detection, eddy current flaw detection, or magnetic particle flaw detection to conduct the inspection. In the present invention, through the combined use of the compound pickling solution and the fluid abrasives, the corrosion resistance treatment of pipe fittings is realized while being green and environmentally friendly, and the damage to the environment and the human body is less.