Steel 15X25T as equivalent of grade 1.4749
Steel 15X25T offers resistance to aggressive agents present at elevated industrial temperatures:
Steel 15X25T can be used in continuous service at temperatures up to 1150 °C (2102 °F). This is among the higher ranges for ferritic steels, making this grade attractive for furnace components, burners, desulfurization systems, and parts subject to prolonged exposure to hot gases.
H25T, like other ferritic chromium steels, has lower strength than austenitic stainless steels in the as-delivered condition. The ductile-to-brittle transition temperature is approximately 100–150 °C (210–300 °F), meaning that below this range the steel is more susceptible to brittle fracture.
Steel 15X25T is frequently used interchangeably with grade 1.4749. Both grades have a similar chromium content (~25%) and very comparable heat-resistant properties, but differ in the stabilizing element:
Values in wt.%. Empty fields indicate no requirement in the grade specification.
| Element | 15X25T | 1.4749 | ||
|---|---|---|---|---|
| Min. | Max. | Min. | Max. | |
| Carbon (C) | — | 0.15 | 0.15 | 0.20 |
| Silicon (Si) | — | 1.00 | — | 1.00 |
| Manganese (Mn) | — | 0.80 | — | 1.00 |
| Phosphorus (P) | — | 0.035 | — | 0.04 |
| Sulfur (S) | — | 0.025 | — | 0.015 |
| Chromium (Cr) | 24.00 | 27.00 | 26.00 | 29.00 |
| Nickel (Ni) | — | 0.60 | — | — |
| Titanium (Ti) | 5×C | 0.90 | — | — |
| Aluminum (Al) | — | — | 0.15 | 0.25 |
Grade 1.4749 (and equivalently 15X25T) is recommended for structural components resistant to scale build-up at temperatures up to approximately 1100 °C and heavily exposed to sulfurous gases. The propensity for carburization in reducing gases is very low, making these grades the appropriate choice for:
Technical information is provided for reference purposes. Prior to using this material in an actual installation, relevant industry standards (PN-EN 10095, ASTM A268) should be consulted.
