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Ohios Steel Professional Members Working together to preserve industry growth ensure consistently high quality standards and to secure safety in all activities relating to steel structures. JOIN OSA Become an ACTIVE orASSOCIATE member of OSA MEETINGS EVENTS OSA Activities which include Business Meetings events and much more. About OSA Learn moreabout us. members work individually and as a group with engineering and architectural students and universities to support steel programs and to give students handson experiences working with steel.