... Q195Dimension: from 10*20 to 300*500 Place of OriginTianjin, China (Mainland)StandardBS, JIS, GB, ASME, ANSI, DINGrade20G, A106B, A179B, A234B, A53B ... the same cross-sectional area of other non-round steel tube, it has light weight, high intensity, big anti-curved section ...