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ASTM A182 321 SO flange

  • Material:ASTM A182 321 SO flange
  • Production:slip on/WN /SW/Threaded/Blind/Lapped joint/Long WN flange
  • Product standards:ASME B16.5
  • Min.Order Quantity:1 Piece/Pieces

ASTM/ASME A/SA182 F321 321H Stainless steel flange forged Disc Rings


1.ASTM A182 F321 Stainless Steel Flanges


The Alloy for ASTM A182 F321 Stainless Steel Flanges is a titanium stabilized austenitic stainless steel. One important feature of the ASTM A182 F321 Flanges is that the alloy has good resistance to general corrosion .


A182 F321 Material has excellent resistance to intergranular corrosion, even after the material has been exposed to elevated temperatures, in the chromium carbide precipitation range i.e. a range between 800 °F to 1500°F. The alloy for A182 Grade F321 BLRF is known to resist oxidation in environments, where the temperature can rise to as high as about 1500°F. Further, in comparison to stainless steel alloys 304 and 304L, A182 Gr F321 SORF has a higher creep and stress rupture strength properties.


SS 321 Blind Flange also possesses good toughness properties at lower temperatures. In fact, SS 321 Slip On Flange maintains its excellent toughness properties, even down to cryogenic temperatures. Hence, it can be used not only in applications where the temperatures are high, but also in cryogenic temperature settings.


Stainless Steel 321/321H Flanges Type Size
ASTM A182 F321 Slip-On Flanges ASTM A182 F321 Threaded Flanges Sizes 1/8″ – 36″
Raised Face or Flat Face
ASTM A182 F321H Weld Neck Flanges ASTM A182 F321H Socket Weld Flanges
ASTM A182 F321H Blind Flanges ASTM A182 F321H Reducing Flanges
ASTM A182 F321 Lap Joint Flanges ASTM A182 F321 Plate Flanges
ASTM A182 F321 Orifice Flanges ASTM A182 F321H Forged Flanges
ASTM A182 F321 Ring Type Joint Flanges ASTM A182 F321H Square Flanges
2.ASME SA182 F321/F321H Equivalent Grades
SS 321 1.4541 S32100 SUS 321 X6CrNiTi18-10
SS 321H 1.4878 S32109 SUS 321H X12CrNiTi18-9


3.ASME SA182 F321H Chemical Composition


Grade Mn Si Cr N P C S Ni Ti
SS 321 2.0 max 1.0 max 17.00 – 19.00 0.10 max 0.045 max 0.08 max 0.030 max 9.00 – 12.00 5(C+N) – 0.70 max
SS 321H 2.0 max 1.0 max 17.00 – 19.00 0.10 max 0.045 max 0.04 – 0.10 0.030 max 9.00 – 12.00 4(C+N) – 0.70 max
4.ASTM A182 SS 321 Flanges Mechanical Properties
Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.0 g/cm3 1457 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %


5.ASTM A182 F321/F321H Flange Standards / 321 Stainless Steel Flange Pressure Ratings :


ASME/ANSI B 16.5 Blind Flange, High Hub Blind Flange, Slip on Flange, Welding Neck Flange, Socket Weld Flange, Ring Type Joint Flange, Lap Joint Flange, Threaded Flange
PRESSURE CLASS 150, 300, 400, 600, 900, 1500, 2500
ASME/ANSI B 16.47 Blind Flange [Series A & B],Welding Neck Flange
PRESSURE CLASS 75, 150, 300, 400, 600, 900
ASME/ANSI B 16.36 Slip on Flange, Threaded Flange, Welding Neck Flange,
PRESSURE CLASS 300, 400, 600, 900, 1500, 2500
BS 4504 SEC 3.1 Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange, Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange,
BS 4504[PART 1] Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange, Welding Neck Flange, Hubbed Slip-On Hubbed Threaded,
BS 1560 BOSS Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange, Welding Neck Flange, Hubbed Slip-On Hubbed Threaded,
PRESSURE CLASS 150, 300, 400, 600, 900, 1500, 2500
BS10 Welding Neck Flange, Plate Slip-On Flange, Screwed Boss Flange, Slip-On Boss Flange, Blind Flange
DIN FLANGES DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673


 Besides having higher strength at temperatures above 1000°F, the ASTM A182 F321H Flanges was developed for enhanced creep resistance properties.

A182 F321H Flange cannot be hardened by heat treatment. The alloy for 321 Stainless Steel Flanges can be hardened only by cold working. Generally flanges made from ASTM A182 F321 Stainless Steel Flanges can be easily welded and processed by conventional shop fabrication techniques. Post-weld annealing is not required for Stainless Steel 321 Flanges.


Due to the carbon content in both the alloys, both 321 stainless steel as well as A182 F321H Material can have dual certification.
Check out the SS 321H Flanges Price List for the flanges in the following size range - ½ inch (15 NB) to 48 inches (1200NB) DN10~DN5000.
Typical applications of the SS 321H Blind Flange include Expansion joints, Furnace parts, Bellows, Heat Exchangers, Heating element tubing, Aircraft exhaust manifolds, Woven or welded screens for high temperature mineral processing as well as Spiral Welded tube for burner pipes and flues.


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