| Specification: | ASTM A312， ASME SA312 | Grade: | UNS S31254 |
|---|---|---|---|
| Type: | Seamless， Welded | Non Destructive Test: | Eddy Current Test ， Hydrostatic Test ， UT ， PT |
| High Light: | SMO 254， High Temperature Seawater， ASTM A312 SS Tube | ||
ASTM A312 S31254 SMO 254 High Temperature Seawater
What is S31254 material?
NAS 185N (SUS 312L， UNS S31254，SMO 254) is a high corrosion resistant austenitic stainless steel with a high nickel， high chromium， high molybdenum alloy design， and provides excellent corrosion resistance in severe corrosion environments such as high temperature seawater.
SMO 254(UNS S31254) is a high-alloy austenitic stainless steel developed for use in seawater and other aggressive chloride-bearing media. The steel is characterized by the following properties:
-Excellent resistance to pitting and crevice corrosion， PRE = ≥42.5*
-High resistance to general corrosion
-High resistance to stress corrosion cracking
-Higher strength than conventional austenitic stainless steels
-Good weldability
Chemical Composition of S31254 / SMO 254
| C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
| ≤0.020 | ≤0.80 | ≤1.00 | ≤0.030 | ≤0.010 | 20 | 18 | 6.1 | 0.20 | 0.7 |
Mechanical Properties of S31254 / SMO 254
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 680 MPa | 98600 psi |
| Yield strength | 300 MPa | 43500 psi |
| Modulus of elasticity | 195 GPa | 28300 ksi |
| Shear modulus | 75 GPa | 10900 ksi |
| Poisson’s ratio | 0.30 | 0.30 |
| Elongation at break | 50 % | 50 % |
| Hardness， Brinell | 210 | 210 |
UNS S31254 Physical Properties
| Density (Kg.m-1) | 8000 |
| Magnetic Permeability | <1.05 |
| Young’s Modulus (N/mm2) | 200 x 103 |
| Specific Heat， 20°C (J.Kg-1.°K-1) | 500 |
| Specific Electrical Resistance， 20°C (µO.m) | 0.85 |
| Thermal conductivity， 20°C | 13.5 |
Thermal Properties of S31254 / SMO 254
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@20-100°C/68-212°F) | 16.5 µm/m°C | 9.17 µin/in°F |
| Thermal conductivity | 14 W/mK | 97.2 BTU in/hr.ft².°F |
Equivalent Material of S31254 / SMO 254:
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | SIS |
| SMO 254 | S31254 | 1.4547 | Z1 CNDU 20.18.06Az | X1CrNiMoCuN20-18-7 | 2378 |
Applications:
-Saltwater handling
-Tall oil distillation columns
-Flue gas desulfurization scrubbers
-Components used in petroleum production
-Food processing equipment
-Process equipment in chemical industry
-Bleaching equipment in the pulp and paper industry
-Flue-gas cleaning
Size Range Of SMO 254 Pipe
1/8" IPS(.405"O. D.) | 3 1/2" IPS( 4.000"O. D.) |
|---|---|
SCH 40， 80 | SCH 10， 40， 80， 160， XXH |
1/4" IPS(.540"O. D.) | 4" IPS(4.500"O. D.) |
SCH 10， 40， 80 | SCH 10， 40， 80， 160， XXH |
3/8" IPS(.675"O. D.) | 5" IPS( 5.563"O. D.) |
SCH 10， 40， 80 | SCH 10， 40， 80， 160， XXH |
1/2" IPS(.840"O. D.) | 6" IPS(6.625"O. D.) |
SCH 5， 10， 40， 80， 160， XXH | SCH 5， 10， 40， 80， 120， 160， XXH |
3/4" IPS(1.050"O. D.) | 8 ” IPS(8.625"O. D.) |
SCH 10， 40， 80， 160， XXH | SCH 5， 10， 40， 80， 120， 160， XXH |
1" IPS:(1.315′O. D.) | 10" IPS(10.750"O. D.) |
SCH 5， 10， 40， 80， 160， XXH | SCH 10， 20， 40， 80 (.500)， TRUE 80(.500) |
1-1/4" IPS(1.660"O. D.) | 12" IPS(12.750"O. D.) |
SCH 10， 40， 80， 160， XXH | SCH 10， 20， 40(.375)， TRUE40(.406)， SCH80(.500) |
1-1/2" IPS(1.900"O. D.) | 14" IPS(14.000"O. D.) |
SCH 10， 40， 80， 160， XXH | SCH10 (.188)， SCH40 (.375) |
2" IPS(2.375"O. D.) | 16" IPS(16.000"O. D.) |
SCH 10， 40， 80， 160， XXH | SCH10(.188)， SCH40(.375) |
2 1/2" IPS(2.875"O. D.) | 18" IPS (18.000"O. D.) |
SCH 10， 40， 80， 160， XXH | SCH-40 (.375) |
