ASTM A312 S31254 SMO 254 Seamless Pipe 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) |
