Carbon Steel Pipe OD1210

Aiming at the problem of insufficient weld seam toughness of traditional ERW schedule pipe, Huayang Steel Pipe's R&D team has developed a "double-sided weld seam grinding + local annealing" process: after welding, the inner and outer weld seams are ground to remove the weld bead, reducing stress concentration; then, local annealing is performed on the weld seam area (heating to 700-750℃), which further eliminates residual stress and improves the toughness of the weld seam. The test results show that the impact energy of the weld seam of ERW SCH 40 pipe after optimization reaches >=35 J at -20℃, which is 20% higher than the national standard.

Huayang Steel Pipe has independently developed an intelligent control system for HFW schedule pipe production, which integrates parameters such as welding current, voltage, induction coil temperature, and sizing pressure into a unified platform for real-time monitoring and automatic adjustment. For example, when the system detects that the wall thickness of the pipe exceeds the allowable deviation, it will automatically adjust the pressure of the forming rolls to correct the wall thickness; when the welding current fluctuates, it will adjust the power output of the high-frequency generator in real time-ensuring the stability of the production process and reducing the rejection rate of schedule pipe to less than 0.5%.

Anti-Corrosion Coating Technology for Special Environment Schedule Pipe

For schedule pipe used in corrosive environments (such as chemical industry, marine engineering), Huayang Steel Pipe provides customized anti-corrosion coating solutions:

: For municipal water supply SCH 40 pipe, hot-dip galvanizing is used, with a coating thickness of >=85μm, which can resist soil corrosion and extend the service life to more than 30 years.

3PE Coating: For oil and gas transmission HFW SCH 80 pipe, 3PE (polyethylene) anti-corrosion coating is adopted, with a total thickness of >=3mm, which has excellent resistance to soil corrosion and chemical corrosion, and meets the requirements of long-distance pipeline projects.