Grade: Q235,Q195,Q215,Q195-Q345 specification: 15*15~200*200 Section Shape: Square Application: Structure Pipe steel pipe , square steel 1,Stndard:GB/T 3094-2000 2,Material:Q195,Q215,Q235 3,Thickness:1.0-7.25mm Standard:BS 1387,GB/T 3094-2000,BS,GB Grade:Q235,Q195,Q215,Q195-Q345 square steel