cold formed channels Grade:s355JOH S355J2H ,Q235B,Q345B cold formed channelsGrade:s355JOH S355J2H , ... certificatestandard:EN10210, EN10219,JIS G3444,ASTM GB/T6723 Cold-formed channels [Specification] H×B×t=20×10×1.0~500×300 ... ×20×10×1.0~500×200×150×14.0Cold-formed channels [Specification] H×B×t=20×10×1.0~500×300 ... .3041.304245.87631.5475.2421.4524.5691.69 cold formed channels