Qingdao Mingzhu Steel Structure Co.,Ltd is one of the professional steel structure, telecom tower, wind turbine tower, overhead power line tower manufacturers and suppliers in China, welcome to wholesale steel structure made in China from our factory. The company has taken the lead in passing the three-system assessment in this industry. In June, 2003, the company passed the ISO 9001: 2008 Project Construction Organization (GB / T50430) quality management system certification , OHSAS18001: 2007 Occupational Health and Safety Management System Certification and ISO14001: 2004 Environmental Management System certification.