73044900 under HS Code TUBES, PIPES AND HOLLOW PROFILES, SEAMLESS, OF IRON (OTHER THAN CAST IRON) OR STEEL - OTHER, OF CIRCULAR CROSS-SECTION, OF STAILESS STEEL: -- OTHER and 73072100 under HS Code TUBE OR PIPE FITTINGS (FOR EXAMPLE, COUPLINGS, ELBOWS, SLEEVES), OF IRON OR STEEL - OTHER, OF STAINLESS STEEL : FLANGES were the top imported HS Codes by S M B INTERNATIONAL in 2021.