Whether the standard number is applicable or not GB/T 15530.1-1995 copper alloy integral casting flange is currently GB/T 15530.2-1995 copper alloy butt welding flange is currently GB/T 15530.3-1995 copper alloy plate type flat welding flange is currently GB/T 15530.4-1995 copper alloy with neck flat welding flange is currently GB/T 15530.5-1995 copper alloy flat welding ring loose plate steel flange GB/T 15530.6-1995 copper alloy butt welding ring loose plate steel flange GB/T 15530.7-1995 copper alloy flange cover is currently GB/T 15530.8-1995 copper alloy and composite flange technical conditions are currently GB/T 17241.1-1998 cast iron pipe flange type is currently GB/T 17241.2-1998 cast iron pipe flange cover is currently GB/T 17241.3-1998 with neck thread cast iron pipe flange is currently GB/T 17241.4-1998 with neck flat welding and neck socket welding cast iron pipe flange GB/T 17241.5-1998 pipe end flanging with neck loose sets of cast iron pipe flanges GB/T 17241.6-1998 overall cast iron pipe flange is currently GB/T 17241.7-1998 cast iron pipe flange technical conditions are currently GB/T 9112-2000 steel pipe flange type and parameters are currently GB/T 9113.1-2000 flat, protruding integral steel pipe flange is currently GB/T 9113.2-2000 concave and convex overall steel pipe flange is currently GB/T 9113.3-2000 grooved surface integral steel pipe flange is currently GB/T 9113.4-2000 ring joint surface integral steel pipe flange is currently GB/T 9114-2000 protruding neck threaded steel pipe flange is currently GB/T 9115.1-2000 flat, protruding face welded steel pipe flange is currently GB/T 9115.2-2000 concave and convex welded steel pipe flange is currently GB/T 9115.3-2000 gutter facing welded steel pipe flange GB/T 9115.4-2000 ring connection facing welded steel pipe flange GB/T 9116.1-2000 flat, protruding surface with neck flat welded steel pipe flange GB/T 9116.2-2000 concave and convex surface with neck flat welded steel pipe flange GB/T 9116.3-2000 grooved surface with neck flat welded steel pipe flange GB/T 9116.4-2000 ring joint surface with neck flat welded steel pipe flange GB/T 9117.1-2000 protruding surface with neck socket welded steel pipe flange GB/T 9117.2-2000 concave and convex surface with neck socket welded steel pipe flange GB/T 9117.3-2000 grooved surface with neck socket welded steel pipe flange GB/T 9117.4-2000 ring joint surface with neck socket welded steel pipe flange GB/T 9118.1-2000 protruding facing welding ring with neck loose steel pipe flange GB/T 9118.2-2000 ring connection facing welding ring with neck loose steel pipe flange GB/T 9119-2000 flat and protruding panel type flat welded steel pipe flange GB/T 9120.1-2000 face welding ring plate loose steel pipe flange is currently GB/T 9120.2-2000 concave and convex facing welding ring plate loose steel pipe flange GB/T 9120.3-2000 gutter facing welding ring plate loose steel pipe flange GB/T 9121.1-2000 protruding flat welding ring plate loose steel pipe flange GB/T 9121.2-2000 concave and convex flat welding ring plate loose steel pipe flange GB/T 9121.3-2000 boring surface flat welding ring plate loose steel pipe flange GB/T 9122-2000 flanged ring plate loose steel pipe flange is currently GB/T 9123.1-2000 flat, protruding steel pipe flange cover is currently GB/T 9123.2-2000 concave and convex steel pipe flange cover is currently GB/T 9123.3-2000 gutter surface steel pipe flange cover is currently GB/T 9123.4-2000 ring connection surface steel pipe flange cover is currently GB/T 9124-2000 steel pipe flange technical conditions are currently Bamboo Charcoal Wood Veneer,Bamboo Wood Fiber Integrated Wall Panel,Bamboo Wood Fiber Wall Panel,Mirror Wood Bamboo Veneer Linyi Dongtai Decoration Materials Co., Ltd , https://www.dongtaiwood.com
National Flange Standard GB