FABRICATED STRUCTURAL STEEL PRODUCTS-NAMELY, PLATFORMS AND LADDERS, STAIRS, WALKWAYS, PIPE BRIDGES, SUPPORT STRUCTURES, PLATE GIRDERS AND CONSTRUCTION MEMBERS, PROCESS HEATERS AND REACTOR INTERNALS, SUCH AS CENTER PIPES, DISTRIBUTOR BASKETS AND SCALLOPS USED IN THE CONSTRUCTION OF REFINERIES, CHEMICAL AND PETROCHEMICAL PLANTS, AND THE LIKE