China Steel One And Half Door factory Our History Buyang group was build in1992,Passed iso9001:2000 international quality system certification in 2000; In 2001, we obtained the right of self-import. In 2002, Buyang fire door passed the national fire safety certification; In 2003, the Ministry of Construction designated Buyang Group as the "designated production enterprise of anti-theft and fire safety door"; In 2011, website:http://www.buyang-door.com/