JIS B2220 Japanese standard steel flange guide: 5K, 10K, 16K, 20K, 30K, SOP, SOH, WN, BL types, dimensions, bolt patterns, ASME/PN conversion. Quote in 30 min.
JIS B2220 is the Japanese Industrial Standard for steel pipe flanges utilized throughout Asian shipbuilding, marine, and industrial plant engineering projects.
JIS B2220 specifies dimensions, tolerances, materials, and testing for Japanese industrial steel pipe flanges in pressure ratings 2K through 63K.
Under JIS B2220 Flange Standard, flange sealing face finishes are critical to leak-free joint integrity. Raised Face (RF) and Flat Face (FF) flanges are machined with a serrated concentric or serrated spiral finish having an average surface roughness between 125 µin and 250 µin (3.2 µm to 6.3 µm Ra), creating an ideal gripping surface for spiral wound or non-asbestos sheet gaskets.
For severe cyclic service or high-pressure hydrocarbons, Ring Type Joint (RTJ) grooves are precision CNC-machined to ASME B16.20 standards. Groove surfaces are finished to a mirror-smooth 63 µin (1.6 µm Ra) max roughness to ensure tight metallic sealing against octagonal or oval ring gaskets.
Compliance with JIS B2220 Flange Standard requires permanent identification legibly stamped on the outer rim of every flange: manufacturer trademark ("REMAX"), governing standard, nominal pipe size (NPS or DN), pressure rating class (e.g. 150#, 300#, 600#), ASTM/ASME material specification and grade (e.g. A105, F316L), schedule/wall thickness, and unique heat batch number.
All markings correlate 1:1 with the accompanying EN 10204 Type 3.1 Mill Test Certificate (MTC), providing verified traceability back to the initial steel melting ladle and forging ingot.
A: '10K' represents a nominal pressure rating of approximately 10 kgf/cm² (1.0 MPa or ~150 psi). However, bolt patterns differ from ASME Class 150.
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