ASME SA182 F321H , F316L , F11 Stainless Steel Forged Large
Diameter Blind Flat Face
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The alloy for ASTM A182 F321H stainless steel flanges is a titanium
stabilized austenitic stainless steel. An important feature of ASTM
A182 F321H flanges is the alloy's good resistance to general
corrosion. The A182 F321H material has excellent resistance to
intergranular corrosion, even after the material is exposed to high
temperature chromium carbide precipitation ranges (i.e., the range
between 800°F and 1500°F). The alloy used for A182 grade F321H BLRF
is known to resist oxidation in environments where temperatures can
be as high as about 1500°F. Additionally, A182 Gr F321H SORF has
higher creep and stress rupture strength properties compared to
stainless steel alloys 304 and 304L. SS 321H blind flanges also
have good toughness at lower temperatures. In fact, SS 321H Slip On
Flange maintains its excellent toughness properties even at low
temperatures. Therefore, it can be used not only in high
temperature applications, but also in low temperature settings.
SA182 F321H Specfication
| F321/F321H | 1.4541/1.4878 | UNS S32100/S32109 |
Chemical Composition of Grade F321 / 321H Stainless Steel Flanges
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| A182 F321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 5(C+N) – 0.70 max |
| A182 F321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 4(C+N) – 0.70 max |
Mechanical Properties of ASTM A182 F321 / F321H
| 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 %
|
ASME/ANSI B16.5 | 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 B16.47 | Blind Flange [Series A & B], Welding Neck Flange |
| PRESSURE CLASS | 75, 150, 300, 400, 600, 900 |
ASME/ANSI B16.36 | 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 |
| PRESSURE CLASS | PN 2.5 TO PN 40 |
BS 4504 [PART 1] | Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange, Welding Neck Flange, Hubbed Slip-On Hubbed Threaded |
| PRESSURE CLASS | PN 2.5 TO PN 400 |
| 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 |
| TABLE | D, E, F, H |
| DIN FLANGES | DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628,
2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673 |
| PRESSURE CLASS | PN 6 TO PN 100 |
The ASTM A182-F316l material is a standard molybdenum bearing grade
stainless steel. In austenitic stainless steel grades, this alloy
is second only to 304 in importance. Molybdenum gives SA182M grade
F316l better overall corrosion resistance compared to 304 grade.
Therefore, the F316L grade has a particularly high resistance to
pitting and crevice corrosion in chloride-containing media and
environments.
Grade 316L, a low carbon version of the F316L pipe flange, is
resistant to sensitization, also known as grain boundary carbide
precipitation. Therefore, the Grade F316L is widely used for
heavy-duty welded components with wall thicknesses in excess of 6
mm. The austenitic structure in ASTM A182 F316L also gives this
grade excellent toughness properties, which can be observed at low
temperatures.
Compared to other chromium-nickel austenitic stainless steels, A182
F316L stainless steel has higher creep strength, stress rupture
strength and tensile strength even at high temperatures. SS 316L
flanges have excellent performance in a wide range of atmospheric
environments and in many corrosive media.
In general, werkstoff SA182 F316L tends to be more resistant to
corrosive media than grade 304 stainless steel. Although these
stainless steel 316L flanges are prone to pitting and crevice
corrosion in warm chloride environments and stress-related
corrosion cracking at temperatures above 60 °C, the SA182 F316L
flanges are considered potable water resistant of. ASTM A182 Gr.
F316L has shown corrosion resistance in drinking water, holding up
to about 1000 mg/L of chloride at ambient temperature and further
reduced to about 500 mg/L at 60 °C.
Flange ASTM A182 F316L is generally considered a standard "marine
grade stainless steel". But ASTM A182 F316L is not resistant to
warm sea water. 316L stainless steel flange material does tend to
exhibit surface corrosion in many marine environments. This surface
corrosion usually manifests as brown staining, especially in
relation to cracks and rough surface finish.
The 316L stainless steel flange shows good oxidation resistance in
intermittent applications up to 870 °C and continuous duty up to
925 °C. Continuous use of flange ASTM A182 F316L in the temperature
range 425 °C - 860 °C is not recommended if subsequent water
corrosion resistance is important in any application. Many 316L
stainless steel flange manufacturers state that this alloy is more
resistant to carbide precipitation and can be used in the above
temperature range.
Corrosion resistance
Chromium, molybdenum, nickel and nitrogen all contribute to overall
resistance to corrosion by various media.
Chromium is the primary agent for imparting corrosion resistance in
neutral or oxidizing environments. Chromium,
molybdenum and nitrogen increase resistance to pitting corrosion.
Nickel imparts an austenitic structure. Both nickel
and molybdenum provide higher resistance to chloride stress
corrosion cracking in reducing environments.
