SHS,CHS, S275, S355J2 Square Hollow Sections

SHS : Square Hollow Sections 사각관, 정사각, 직사각
CHS : Circular Hollow Sections 원형강관, Pipe로

Steel Grade로는 S235JRH, S275J0H, S275J2H,
S355J0H, S355J2H, S355K2H,