Steel pipes used in the hydraulic system is divided into cold drawn seamless pipe for hydraulic and stainless seamless pipe for hydraulic, stainless steel seamless pipe has superior mechanical properties, but due to their cost, low accuracy, has not been commonly used. Ordinary seamless steel tubes are commonly used, but its poor mechanical properties, low accuracy, usually before use to go through a series of welding, test equipment, pickling, alkaline cleaning, washing, long string of oil, leak testing, process complex, time consuming and expensive material is not reliable, and has not been able to completely remove the residue in the pipe, and become a serious hazard for the entire hydraulic system failure at any time. Noted in the statistics, 70% failure in the hydraulic system is causes.

The ordinary complex process virtually seamless steel pipe used in the hydraulic system to become a high-investment, high-consuming work, and so greatly increase the cost.