Welded tight to the nation's expanding economy, Canada's steel mills are forging themselves a rapidly-hardening reputation in international heavy industry. Newly built, modern plants coming into production, other mills boosting capacity with capital equipment second to none, an industry wide expansion coupled with booming development of Canadian iron ore -- these factors have turned Canada from an importer of big steel to an exporter ($150,000,000 worth last year) and boosted total primary iron and steel value to annual billion dollars. Across the oceans of the world, Canadian made steel is carried by ponderous, deep-draught ships to Germany, New Zealand, Sweden, Peru and scores of other countries. In Canada, production of 7,500,000 tons of ingots and castings a year assures an industrial complex nurtured by deep roots of hardened steel.