370l/420l/440l/510l/550l/610l/700l/750l/800l Steel of the Cold Bent Round Weld Steel Pipe
30 - 325mm
Wall thickness: 1.5-12
Q235B/C/D/E, Q345B/C/D/E, Q390C/D/E, Q420C/D/E, Q550C/D/E, Q690C/D/E, 370L/420L/440L/510L/550L/610L/700L/750L/800L
QSTE380700 series; S355-960MC series;
Weathering steel and other domestic and foreign types
GB/T6725, GB/T 6728, GB/T 26080, etc.
Cold bending, weld heat treatment, overall heat treatment (annealing, normalizing, tempering)
Cold drawing after weld removal is adopted to meet the requirment of use and reduce the cost.