Smo 254 is a super austenitic stainless steel alloy, therefore it exhibits outstanding resistance to corrosion. The alloy contains about 6% molybdenum in its alloy. Molybdenum is an element that has been associated with a high pitting resistance. In an environment that is prone to corrosion by oxidation, the presence of molybdenum in the smo 254 flanges enhance the performance of the passivating oxide layer formed on its surface. With the oxide layer acting as a strong, adhering protective barrier, the surface of these components have a minimal risk of getting corroded by pitting.
Moreover, molybdenum increases the PREN value of alloys. In the case of 254 Smo Flanges, the PREN value stands at 43, which is much better than conventional stainless steel grades. However, this property comes at a high cost, because of the expensive elements used in its chemical composition. Despite its high cost, the SMO 254 Spectacle Blind Flange is suited to applications in aggressive applications, especially since both super duplex and duplex stainless steel alloys are prone to corrosion. One such instance is in maritime flue gas desulphurization units, where the environmental temperature is higher than a super duplex alloy, the 6mo Flat Flange is ideal. This is possible due to the high content of nickel in its alloy, without any changes in its mechanical properties. The chemical composition of this super austenitic stainless steel grade gives the Din 1.4547 Smo Socket Weld Flanges mechanical strength that is almost two times that of grades that belong to the 300 series. Resistance to Chlorine induced Stress related corrosion cracking as well as resistance to crevice corrosion is the other important properties of this alloy, apart from excellent resistance to pitting.
Specifications | SMO 254 Flanges |
---|---|
Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI, ASME, BS, DIN, EN, GOST |
size range | 1/2" (15 NB) to 48" (1200NB) DN10~DN5000 |
DIN Standard | 6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 |
ANSI Standard | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
UNI Standard | 6Bar 10Bar 16Bar 25Bar 40Bar |
Standard EN | 6Bar 10Bar 16Bar 25Bar 40Bar |
JIS Standard | 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K |
Main Types | Threaded / Forged / Screwed / Plate |
Flange supporting material | Gasket, Flange Bolts, Ring Joint |
Test | X-ray detector, Hydrostatic testing machine, UI trasonic flaw detector, Direct-reading Spectrograph, Magnetic particle detector |
Equipment | Pushing Machine, Bending machine, Press machine, electric bevelling machine, Sand-blasting machine etc |
Flange Face Type | Raised Face, Lap-Joint Face, Ring Type Joint, Flat Face, Small Tongue, Large Male-Female, Small Male-Female, Large Tongue & Groove Flanges manufacturer and Supplier |
Flanges Marking | All SMO 254 Flanges are marked as follows: Supplier or Manufacturer’s Name, Size, Class, Bore, Dimension, Material, Heat No. (Or according to the customer’s request. |
8 inch SMO 254 Slip on Flange
ANSI B16.5 SMO 254 Reducing Flange
Uns S31254 Super Duplex Stainless Steel Flanges
10 inch ASME SB403 Nickel Blind Flange
6mo Plate Flange
WELD FLANGE 254 SMO FLANGE ASTM A182 F44 UNS S31254
254 Smo Flanges
SMO 254 Weld Neck Raised Face Flanges
ASTM A182 F44 Uns S31254 Smo 254 Flanges
ASTM B403 SMO Spectacle Blind Flanges
SMO 254 Ring Type Joint Flange
UNS S31254 Pipe Flange
Standard | Class | Diameter | Bolt Circle Diameter | Number of Bolts | Bolt Size | Diameter of Bolt Hole |
---|---|---|---|---|---|---|
AS4087 | PN14 | 95 | 67 | 4 | M12 | 14 |
AS 2129 Flanges | Table C | 95 | 67 | 4 | 13 | 14 |
Table E | 95 | 67 | 4 | 13 | 14 | |
Table F | 95 | 67 | 4 | 13 | 14 | |
Table H | 114 | 83 | 4 | 16 | 17 | |
Table D | 95 | 67 | 4 | 13 | 14 | |
Table J | 114 | 83 | 4 | 16 | 17 | |
ANSI B16.5 | ANSI 150 | 89 | 60 | 4 | 13 | 16 |
ANSI 300 | 95 | 67 | 4 | 13 | 16 | |
ANSI 900 | 121 | 83 | 4 | 19 | 22 | |
ANSI 1500 | 121 | 83 | 4 | 19 | 22 | |
ANSI 600 | 95 | 67 | 4 | 13 | 16 | |
ISO 7005 (DIN) Flanges | PN6 | 80 | 55 | 4 | M10 | 11 |
PN16 | 95 | 65 | 4 | M12 | 14 | |
PN20 | 90 | 60.5 | 4 | M14 | 16 | |
PN25 | 95 | 65 | 4 | M12 | 14 | |
PN10 | 95 | 65 | 4 | M12 | 14 | |
PN40 | 95 | 65 | 4 | M12 | 14 |
SMO 254 | Nickel | Carbon | Molybdenum | Manganese | Silicon | Iron | Copper | Sulfur | Phosphorus | Chromium |
17.5 - 18.5 |
0.02 max | 6 - 6.5 |
1 max | 0.8 max | - | 0.5 - 1 | 0.01 max | 0.03 max | 19.5 - 20.5 |
Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
8.0 g/cm3 | 1320-1390 - | 300 | 650 | 35 % |
STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | SIS | GOST |
SMO 254 | S31254 | 1.4547 | Z1 CNDU 20.18.06Az | X1CrNiMoCuN20-18-7 | - | 2378 | - |
ASME/ANSI B 16.5 | Socket Weld Flange, Welding Neck Flange, Lap Joint Flange, Slip on Flange, Blind Flange, High Hub Blind Flange, Threaded Flange, Ring Type Joint Flange |
Pressure Class | Class 150, 300, 400, 600, 900, 1500, 2500 LBS |
ASME/ANSI B 16.47 | Blind Flange, Welding Neck Flange [Series A & B] |
Pressure Class | Class 75, 150, 300, 400, 600, 900 LBS |
ASME/ANSI B 16.36 | Slip on Flange, Welding Neck Flange, Threaded Flange |
Pressure Class | Class 300, 400, 600, 900, 1500, 2500 LBS |
BS 4504 SEC 3.1 | Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange, Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange |
Pressure Class | PN 2.5 TO PN6, PN10, PN16, PN25, PN40 |
BS 4504 [PART 1] | Welding Neck Flange, Hubbed Slip-On Hubbed Threaded, Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange |
Pressure Class | PN 2.5 PN6, PN10, PN16, PN25, PN40 TO PN 400 |
BS 1560 BOSS | Welding Neck Flange, Socket Welding Flange, Slip-On Flange, Blind Flange, Screwed Boss Flange, Lapped Flange |
Pressure Class | Class 150, 300, 400, 600, 900, 1500, 2500 LB |
BS10 | Screwed Boss Flange, Welding Neck Flange, Plate Slip-On Flange, Slip-On Boss Flange, Blind Flange |
TABLE | Table D, Table E, Table F, Table H |
DIN Flanges | DIN 2627, 2634, 2629, 2631, 2655, 2637,2638, 2576, 2633, 2573, 2527, 2566, 2636, 2632, 2656, 2673, 2628, 2635, 2641,2642, |
Pressure Class | PN6, PN10, PN16, PN25, PN40 TO PN 100 |