Pittsburgh--MetalSite L.P., a transactional steel Web site whose equity owners include Bethlehem, Pa.-based Bethlehem Steel Corp., will launch banking services for its b-to-b customers. The services will link users of the site (www.metalsite.net) to outside financial institutions, which will pre-certify them to make steel purchases over MetalSite, said Patrick Stewart, MetalSite's CEO. MetalSite will also allow companies to market aluminum over the Web site. Currently, companies can only sell steel over the venue. MetalSite will market its new services at steel industry trade shows and through magazines.