National standard flange (English: National standard flange) refers to the flange plate produced in accordance with the national standard of the People's Republic of China "GB / T 9112 ~ 9124-2010 steel pipe flange".
The national standard flange standard was jointly issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the National Standardization Administration of China on 2011-01-10, and it is a recommended standard implemented from 2011-10-01.
GB / T 9112 ~ 9124-2010 includes a total of 13 standards:
Replaced the national standard GB / T9112-2000; GB / T10745-1989 standard
GB / T 9112-2010 steel pipe flange type and parameter
GB / T 9113-2010 integral steel pipe flange
GB / T 9114-2010 pipe flange with neck thread steel
GB / T 9115-2010 butt-welded steel pipe flange
GB / T 9116-2010 flat welded steel pipe flange with neck
GB / T 9117-2010 welded steel pipe flange with neck socket
GB / T 9118-2010 butt welding ring with neck loose sleeve steel pipe flange
GB / T 9119-2010 plate flat welded steel pipe flange
GB / T 9120-2010 butt welding ring plate loose tube steel flange
GB / T 9121-2010 flat welded ring plate loose sleeve steel pipe flange
GB / T 9122-2010 Flanged ring plate loose sleeve steel pipe flange
GB / T 9123-2010 steel pipe flange cover
GB / T 9124-2010 steel pipe flange