321H Flanges
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We produce 321H flanges,321 H flanges,321H Blind Flanges,321H Welding Neck Flanges,321H Slip On Flanges,321H Socket Welding Flanges,321H Lap joint Flanges,321H Ring joint Flanges,321H Slip-on flanges,321H Weld Neck Flanges,321H WN flanges,321H LWN flanges, 321H Long weld neck flanges,Nimonic 90 orifice flanges,321H Spectacle blind Flanges,321 H Spectacle flanges, 321 H spacer ring flanges,321H Swivel Ring Flanges,321H WNRF Flanges,321H SORF Flanges,321H SWRF Flanges,321H Threaded Flanges,321H Ring Type Joint Flanges,321H BLRF Flanges,321H RTJ Flanges from china

The size of 321H flanges that we could do is from 1/2” – 96”, DN15-DN2000

We could produce 321H flanges with pressre from 150LB-2500LB or PN6-PN100

The face of 321H flanges that we could do is in Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Also we could produce 321H flanges as per the drawing of the clients

Following is the standard of 321H flanges that we could do:

American standard of 321H flanges in ANSI B16.5 ;ASME B16.47 Series A(MSS SP-44);ASME B16.47 Series B(API 605);ANSI B16.1,AWWA C207

Germany standard of 321H flanges in DIN 2630,2620,2632,2633,2634,2635,2636,2637,2638,2501(WN);


British standard of 321H flanges in BS3293,BS4504,BS10

The Italy standard of 321 H flanges in UNI27676-67,UNI27677-67,UNI27678-67,UNI6083-67,UNI6084-67,,UNI6088-67,,UNI6089-67,UNI27699-67,,UNI2300-67,UNI27680-67,,UNI27681-67,,UNI27682-67,,UNI27683-67

Janpanese standard of 321H flanges in JIS B27620,

Korean Standard of 321H flanges in KSB 1503,KSB 6216,KSB 2332,KSB 2333,KSD 3578,KSD 4308.

Australian standard of 321H flanges in AS 4087,AS 2129,AS/NZS 4320.1

ISO standsard of 321H flanges in ISO 7005-1,ISO 9624

Russian standard of 321H flanges in GOST 12820,GOST 12821,GOST 12836,GOST 12820-80,GOST 12821-80,GOST 12836-80.

European standard of 321 H flanges in EN1092-1

South african standard of 321H flanges in SABS-1123/SANS-1123

As per surface treatment of 321 H flange, we could do Anti-rust Oil;Black /Yellow Paint;Hot-dipped Galvanization as per the requirement of the clients

The material grade of 321 H flanges is by forging as per the standard of ASTM B462.

We could do solution treatment, ageing treatment for 321H flanges as per the requirement of the clients

321H is suitable for wet-corrosive service but also has good mechanical strength at high temperatures.

The chemical composition of 321H flanges is as follows


Content (%)



















The mechanical property of 321H flanges is as follows



Tensile  strength

480 MPa

Yield  strength

205 MPa

Elongation  at break


Hardness,  Brinell


In order to control the quanlity of 321H flanges, our workshop has followsing inspection equipment:Impact testing machine ,Magnetic particle flaw detector ,Metallographic Microscope ,Portable Spectrometer ,Ultrasonic Flaw Detector ,Universal testing machine ,Hardness testing machine

We could supply material certificate of 321H flanges  as per the standard of EN10204-3.1 or EN10204-3.2 of third party(like TUV,DNV,GL and so on)

Our 321H flanges will be 100% Ultrasonic Inspection as per the forging parts UT Test standard of ASTM A 388 or EN102768.

Our 321H flanges are widely used in many industries,such as Flue gas scrubbers,Chlorination systems,Acid production and pickling systems,Outlet ducting and stack liners for power plants,Sulfur dioxide scrubbers,Pulp and paper bleach plants,Weld overlay of less corrosion resistant metals,Pesticide and other agrichemical production,Tubular heat exchangers

Plate heat exchangers,Nuclear fuel reprocessing,incineration scrubber systems and so on

As per packing of 321H flanges, we will use  Veneer Case or Plywood Case

Please send us the drawing of 321H flanges, we are glad to quote the best price for your side.

Except 321H flanges,we also could produce 321H bars,321H plates,321H fasteners,321H bolts,321H pipe fittings,321H pipes,321H tubes,321H springs