ASTM A105-A105M American Standard with SO Neck Flat Welded Flange, A105 is the American ASTM standard forged carbon steel grade, A means ordinary carbon structural steel, which is equivalent to domestic 20# steel. In general, domestic pipe fitting manufacturers are basically replaced by 20# steel, and the chemical composition and mechanical properties and ASTM A105 are basically in line. The executive standard is ASTM A105-A105M-2010 Carbon Steel Forgings for Pipe Components.
SO necked flat welded flange, the full name is necked flat welded steel pipe flange, which is a flange that extends steel pipes, pipe fittings, etc. into the flange and connects with equipment or pipelines through fillet welds. The function of the SO flat weld flange with neck is the same as that of the plate flat weld flange, which is also a flange that extends steel pipes, pipe fittings, etc. into the flange and connects with equipment or pipelines through fillet welds. SO flat welded flange sealing form: protruding surface (RF), concave surface (FM), convex surface (M), mortise surface (T), groove surface (G), full plane (FF). Diameter range with neck flat weld flange: DN10 ~ DN600. SO with neck flat weld flange scope PN2.5~PN40; Class Series Class150~Class1500
SO Flat Weld Flange with Neck Material: According to the manufacturing material, carbon steel, stainless steel, alloy steel, special alloy steel, duplex stainless steel, etc.; Carbon steel: (20#, A3, Q235A, Q235B, 20G, 16Mn, ASTM A234WPB, ASTM A105, etc.); Stainless steel: (304, 304L, 316, 316L, S30408, S30403, S31608, S31603, SUS304, ASTM A403, TP321, TP317L, 347, 0Cr18Ni9, 00Cr19Ni10, , 1Cr18Ni9Ti, 06Cr17Ni12Mo2 , 022Cr17Ni12Mo2, etc.)
Advantages of SO Flat Weld Flange with Neck: The flat weld flange with neck is also a flat weld flange, because there is a short neck, which improves the strength of the flange and improves the bearing resistance of the flange. Therefore, it can be used in higher pressure pipelines. Disadvantages of collared SO flat weld flange: It is more expensive than plate flat weld flange, and it is easier to hit during transportation due to its shape characteristics.
American Standard SO Neck Flat Bridge Manufacturing Standard: ANSI B16.5
Chinese National Standard: GB/T9116-2010 Welded Steel Pipe Flat Flange with Neck
China Chemical Industry Standard: G/T20592~20635-2009 PN Series (European System) HG/T20592~20635-2009 Class Series (US System)