Material data sheet 1.4547
International Standards:
X1CrNiMoCuN20-18-7 | Alloy 254SMO | UNS S31254 | 6Mo / F44
Applications:
Due to its high molybdenum content and the addition of nitrogen, material 1.4547 exhibits good mechanical properties and excellent resistance to pitting, crevice, and surface corrosion. It is ideal for applications involving diluted sulfuric or phosphoric acid contaminated with chlorides. Material 1.4547 is seawater-resistant.
Area of application:
| - Offshore technology and shipbuilding |
| - Chemical industry plants |
| - Parts for flue gas desulfurization systems |
| - Parts for bleaching plants in the pulp and paper industry |
| - Seawater desalination plants |
| - Water treatment plants |
Characteristics:
| Polishability | good |
| Weldability | very good |
| Machinability | good |
| Forgeability | good |
| Corrosion resistance | very good, 1.4547 offers very high resistance to pitting and crevice corrosion |
| Corrosion class | Pren ≥ 42 |
Physical properties:
| Density | 8 g/cm³ |
| Electrical resistance at 20°C (Ω mm2 /m) | 0,85 |
| Thermal conductivity at 20°C (W/m K) | 13.0 W/m °C |
| Specific heat capacity at 20°C (J/kg K) | 500 |
| Magnetizability | no |
Mechanical properties:
| hardness | ≤ 215 |
| 0,2 % proof strength | ≥ 200 |
| Tensile strength | 500-700 |
| Elongation at break (transverse) | ≥ 40% |
Special features:
| - excellent corrosion resistance in seawater |
| - increased resistance in sulfuric and phosphoric acid contaminated with chlorides |
| - very good resistance to pitting, crevice and surface corrosion |
Processing:
| Open-die and drop forging | good |
| Machining | tends to work harden during machining |
Heat treatment:
| Forging | 1200 to 950 °C |
| Welding | weldable with all common welding processes |
| Annealing | Solution annealing at at least 1150 °C, followed by water quenching |
| Stress relieving annealing | at approx. 500°C |
| Hardening | no |
Chemical analysis:
| 1.4547 | C | Si | Mn | P | S | Cr | Mo | Ni | Cu | N |
|---|---|---|---|---|---|---|---|---|---|---|
| min. | 19,5 | 6,0 | 17,5 | 0,5 | 0,18 | |||||
| max. | 0,02 | 0,70 | 1,00 | 0,03 | 0,01 | 20,5 | 7,0 | 18,5 | 1,0 | 0,25 |
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