304 stainless steel flange

304 stainless steel flange is a commonly used type of stainless steel flange, and each type of stainless steel has good performance in its specific application field. Firstly, it is necessary to clarify the purpose of the flange, and then determine the correct stainless steel grade. Commonly used stainless steels include 304, 304L, 316, 316L, etc. They all contain chemical components such as chromium and nickel. Adding molybdenum can further improve atmospheric corrosiveness, especially resistance to corrosion in chloride containing atmospheres. A flange, also known as a flange, is a component that connects pipes to each other. There are holes on the flange, and bolts tightly connect the two flanges. Flange connection refers to a detachable connection composed of flanges, gaskets, and bolts that are connected to each other as a combined sealing structure. Pipeline flange refers to the flange used for piping in pipeline devices, and used on equipment refers to the inlet and outlet flange of the equipment.

304 stainless steel flanges are made by forging SUS304 material. Other commonly used stainless steel materials at home and abroad include: (304, 304L, 316, 316L, S30408, S30403, S31608, S31603, SUS304, ASTM A403, TP321, TP317L, 347, 0Cr18Ni9, 00Cr19Ni10, 00Cr17Ni14Mo2, 1Cr18Ni9Ti, 06Cr17Ni12Mo2, 022Cr17Ni12Mo2, etc.);

Common types and codes of 304 stainless steel flanges: 1. PL plate flat welding flange, 2. SO with neck flat welding flange, 3. WN with neck flat welding flange, 4. SW socket welding flange, 5. Th threaded flange, 6. BL flange cover, 7. Eight shaped blind plate, 8. PJ/SE with neck flat welding ring loose flange, 9. PJ/PR flat welding ring loose flange, 10. reducing flange, 11. stainless steel flange, 12. pressure vessel flange, 13. American standard flat welding flange, 14. American standard SO with neck flat welding flange, 15. American standard WN with neck flat welding flange

Common sealing surface form codes for flanges: convex surface RF, concave surface FM, convex surface M, tenon surface T, groove surface G, full plane FF, ring connection surface RJ

Common execution standards for flanges: The current flange standards in China are divided into two systems, namely the PN series (European system) and the Class series (American system). The pressure markings specified in this standard are divided into PN markings and Class markings. The PN label has 12 pressure levels, namely: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400。 The Class label has 6 pressure levels, namely: Class 150; Class 300; Class 600; Class 900; Class1500; Class 2500。 The implementation standards include GB series (national standards), JB series (mechanical department), HG series (chemical department), ASME B16.5 (American standard), BS4504 (British standard), DIN (German standard), JIS (Japanese standard).

National standards: GB/T9112-2010, GB/T9119-2010, GB/T9116-2010, GB/T9115-2010

Standard of the Ministry of Chemical Industry: HG/T20592-2009、HG/T20615-2009、HG5010-52～HG5028-58、HGJ44-91～HGJ65-91、HG20592-97

American standard: ASME B16.5, ASME B16.47

Mechanical Department Standards: JB81-59~JB86-59, JB/T79-94~JB/T86-94, JB/T74-1994