□150×150×6 □150×150×6 Square tube (GB/T 6728) RHS 150 150 6 15 3332 26.1567 11282184 150429 177528 58.1888 11282184 150429 177528 58.1888 18399598 0.5742 0.5365 Pending verification – nominal dimensions entered by the application developer GB/T 6728:2017 Cold formed steel hollow sections for general structure 2017 2017 2026-10-12 UNVERIFIED Outer corner radius assumed as 2.5t (GB/T 6728 permits a range) for property calculation; confirm against GB/T 6728:2017 Cold formed steel hollow sections for general structure and the manufacturer catalogue. Typical grade: Q355B. popular