Manufactured through hot rolling or cold drawing processes, the product undergoes over a dozen procedures, including skinning, piercing, acid washing, solution heat treatment, and non-destructive testing (such as ultrasonic and eddy current testing).

The cold drawing process achieves wall thickness accuracy of ±0.1mm and outer diameter tolerance of ≤±0.5%, meeting the stringent requirements for pipe sealing in high-pressure boilers.

Our company is now executing the GB/T 5310-2023 national standard for seamless steel tubes used in high-pressure boilers, which corresponds to international standards such as ASTM 1020 and JIS S20C.

The acceptance standards require a negative tolerance of no more than 5% to ensure the pipeline maintains a safe margin under high pressure.