pipe of steel sheet):
structure(column):use Q345 steel, and its quality fit for the standard of Low
Alloy High Strength Steel Structure(GB1594-94). The materials meet the 5 basic
use Q235 steel, and its quantity fit for the Common Carbon Steel Structure
Technology Standard (GBGB700-88).
the steel should fit for the extreme amount of sulfur and phosphorus, the
welding steel should fit for the extreme amount of carbon.
ratio of winding and stretching strength should be smaller than 0.85.
steel should have plenty room for winding, the stretching ratio should be
greater than 20%
welding and tensile performance.