Loose flange (PJ)
Butt ring loose flange (PJ/SE)
Flat welding ring loose flange (PJ/RJ)
Loose flange butt weld ring (flange) / SE
Loose flange flat welding ring (flanging) / RJ
 
1. Sealing surface form: 
protruding surface (RF), ring connecting surface (RJ) 
2. Flange material:
Carbon Steel: ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70; 
Stainless Steel (Stainess Steel): ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8 ; 
alloy (alloy Steel): Fl to ASTM A182, F5a, the F9, the F11, F12, F 22, F91, A182F12, A182F11,16MnR, of Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, ST45.8 / ⅲ; 
. 3, flange Standard: ANSI B16.5, HG20619-1997, GB/T9118-2000, HG20599-1997
 
 
European system steel pipe flange application range
Sealing surface type Nominal pressure PN/MPa 
(bar)
0.6 
(6)		  1.0 
(10)		 1.6 
(16) 		 2.5 
(25)		  4.0 
(40)
Facet (RF)   DN10-600
American system steel pipe flange application range
Sealing surface type Nominal pressure PN (MPa) 
(Class)
2.0 
Class 150		 5.0 
Class 300		 11.0 
Class 600		 15.0 
Class 900		 26.0 
Class 1500		 42.0 
Class 2500
Facet (RF) DN15-600 
(1/2"-24")		 DN15-300 
(1/2"-12")
Ring connection surface (RJ)
 

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