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Common standards for stainless steel flanges
1: National standard: GB9112-88 (GB9113·1-88～GB9123·36-88.
2: American Standard: ANSI B16.5, ANSI 16.47 Class150, 300, 600, 900, 1500 (TH, LJ, SW).
3: Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL).
4: German standard: DIN2527, 2543, 2545, 2566, 2572, 2573, 2576, 2631, 2632, 2633, 2634, 2638 (PL, SO, WN, BL, TH).
5: Italian standard: UNI2276, 2277, 2278, 6083, 6084, 6088, 6089, 2299, 2280, 2281, 2282, 2283 (PL, SO, WN, BL, TH).
6: British Standard: BS4504, 4506.
7: Standards of the Ministry of Chemical Industry: HG5010-52～HG5028-58, HGJ44-91～HGJ65-91 HG20592-97 (HG20593-97～HG20614-97) HG20615-97 (HG20616-97～HG20635-97).
8: Mechanical department standard: JB81-59～JB86-59, JB/T79-94～JB/T86-94.
9: Pressure vessel standard: JB1157-82～JB1160-82, JB4700-2000～JB4707-2000.
10: Marine flange standards: GB/T11694-94, GB/T3766-1996, GB/T11693-94, GB10746-89, GB/T4450-1995, GB/T11693-94, GB573-65, GB2506-89, CBM1012 -81, CBM1013, etc.
The use of stainless steel flanges also varies widely. This forces stainless steel flange enterprises to use different stainless steel flanges when producing valves. Different stainless steel flanges need to be produced according to different regions, which undoubtedly increases the burden on enterprises.
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