In solutions that contain halogens such as chloride and bromide, conventionally used austenitic stainless steels are readily attacked by local corrosion in the form of either pitting, crevice corrosion or stress related corrosion cracking. The presence of the aforementioned halogens in acidic environments also accelerates the rate of general corrosion in the more traditionally used grade 304 & alloy 316, thus making them susceptible to stress corrosion cracking in chloride ion containing solutions; especially when the alloy has been exposed to a temperature exceeding 60°C. In general, any increase noted in the contents of elements nickel and molybdenum in austenitic steel grades, improve the corresponding alloy’s resistance to SCC.
SMO 254 Forge Fittings
ASTM A182 UNS S31254 Socket weld Elbow
SMO 254 alloy Threaded Coupling
Since the SMO 254 Forged Fittings contains both nickel and molybdenum in their alloy, the resistance to corrosion is an important characteristic. Moreover, the addition of nitrogen in the alloy of SMO DIN 1.4547 Coupling also improves its resistance to pitting, while aiding in the substantial increase in its yield strength. Speaking of its resistance to pitting, the PREN value or Pitting Resistance Equivalent number of UNS S31254 Union can be as high as 44, thus proving to be of importance to the marine industry. Both the SMO 254 alloy Threaded Coupling as well as threaded fittings prove to be useful in applications where the diameter of the bore is about 2 NPS or smaller. In addition to the improved corrosion resistance property and the enhanced yield strength, the 254 SMO Threaded Elbow is much tougher, which is indicative of long service life.
Dimension Specification | ASME 16.11, MSS SP-79, 83, 95, 97, BS 3799 |
---|---|
Thread | NPT, BSPT, BSPP |
Type | DN15-DN1200 |
End | Threaded, Welding, JIC |
Pressure Rating | Threaded end-2000lb/ 3000lb/ 6000lbs Pipe Fittings Socket-weld end-3000/ 6000/ 9000lbs Pipe Fittings |
Connection | Welding |
Manufacturing process | Push, Press, Forge, Cast, etc. |
Test Certificates | EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc |
Specialized manufacturer of | 90º Elbows, 45º Elbows, Tees, Crosses, Couplings, Reducers, Inserts, Caps, Nipples, and Unions, Forged Pipe Fittings, Socket Weld & Threaded, Equal Tees & Reducing Tees, 90° & 45° Elbows – Female-Female, Male-Female, Male-Male, Union, Nipples, Couplings, Plugs Fittings |
Application |
|
Alloy 254 Threaded Fittings | SMO UNS S31254 90 Deg Screwed-Threaded Elbow |
254 SMO 45 Deg Screwed-Threaded Elbow | SMO DIN 1.4547 Equal Tee |
SMO 254 Unequal Tee | ASTM A182 SMO 254 Equal Cross |
UNS S31254 6mo Unequal Cross | Grade SMO 254 Full Coupling |
SMO 254 Half Coupling | Alloy 254 Reducing Coupling |
SMO DIN 1.4547 Cap | ASTM A182 SMO 254 Bushing |
254 SMO Plug | UNS S31254 6mo Hex Nipple |
Grade SMO 254 Elbow | SMO UNS S31254 Bull Plug |
SMO DIN 1.4547 Welding Boss | ASTM A182 SMO 254 Swage Nipple |
SMO 254 Pipe Nipple | Grade SMO 254 Adapter |
254 SMO Union Male Female | SMO UNS S31254 Union BS 3799 |
Alloy 254 Branch Outlet | UNS S31254 6mo Elbow Outlet |
Pipe Size | Schedule | Wall Thick. | SMO 254 Elbow 90 (Each) |
---|---|---|---|
1″ | 80 | 0.179″ | $158.36 |
1 1/2″ | 80 | 0.200″ | $258.36 |
2″ | 80 | 0.218″ | $348.34 |
3″ | 80 | 0.300″ | $398.48 |
Grade | % | Ni | Cr | Mo | Cu | N | C | Mn | Si | P | S |
SMO 254 | Min. | 17.5 | 19.5 | 6 | 0.5 | 0.18 | |||||
Max. | 18.5 | 20.5 | 6.5 | 1 | 0.22 | 0.02 | 1 | 0.8 | 0.03 | 0.01 |
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 | – |
NPS | Socket Bore |
Depth Socket |
Bore diameter |
Socket wall thickness |
Body wall thickness |
Center to bottom of socket A |
|
B | J | D | C | G | 45° | ||
1/2 | 21.95 21.70 |
10 | 16.6 15 |
4.65 4.10 |
3.75 | 11.5 | |
3/4 | 27.30 27.05 |
13 | 21.7 20.2 |
4.90 4.25 |
3.90 | 12.5 | |
1 | 34.05 33.80 |
13 | 27.4 25.9 |
5.70 5.00 |
4.55 | 14 | |
1¼ | 42.80 42.55 |
13 | 35.8 34.3 |
6.05 5.30 |
4.85 | 17 | |
1½ | 48.90 48.65 |
13 | 41.7 40.1 |
6.35 5.55 |
5.10 | 21 | |
2 | 61.35 61.10 |
16 | 53.5 51.7 |
6.95 6.05 |
5.55 | 25 | |
2½ | 74.20 73.80 |
16 | 64.2 61.2 |
8.75 7.65 |
7.00 | 29 | |
3 | 90.15 89.80 |
16 | 79.5 46.4 |
9.50 8.30 |
7.60 | 31.5 | |
4 | 115.80 115.45 |
19 | 103.8 100.7 |
10.70 9.35 |
8.55 | 41.5 |