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新日铁从经济角度考虑,新近开发了以18-8系为基本成分的发电锅炉用钢管XA704(火SUS347J1TB);尽管为了确保这
Nippon Steel from the economic point of view, the recent development of the 18-8-based power generation boiler tubes XA704 (fire SUS347J1TB); although in order to ensure that