As a chromium-molybdenum(Cr-Mo) alloy steel, the EN 10216-2 16Mo3 seamless pipe is mainly utilized at elevated temperatures in oil refinery piping, steam pipeline, and power plant projects, etc. The steel number of grade 16Mo3 is 1.5415 which is an European designation. The relative ASTM equivalent is ASTM A335 Grade P1(also known as ASME SA335 Grade P1). The A335 P1 pipe is also used in high-temperature services which contains a bit higher molybdenum by mass.
1. EN 10216-2 16Mo3 chemical composition
| Element | Content by Mass, % |
|---|---|
| Carbon (C) | 0.12~0.20 |
| Silicon (Si) | ≤0.35 |
| Manganese (Mn) | 0.40~0.90 |
| Phosphorus (P) | ≤0.025 |
| Sulfur (S) | ≤0.020 |
| Chromium (Cr) | ≤0.30 |
| Molybdenum (Mo) | 0.25~0.35 |
| Nickel (Ni) | ≤0.30 |
| Aluminium (Al) | ≤0.040 |
| Copper (Cu) | ≤0.30 |
2. Mechanical properties of EN 10216-2 16Mo3(1.5415) seamless pipes
Yield Strength & Tensile Strength
| Yield Strength for Wall Thickness T, Min. MPa | Tensile Strength MPa |
||
| T ≤ 16 | 16 < T ≤ 40 | 40 < T ≤ 60 | - |
| 280 | 270 | 260 | 450~600 |
Elongation and Impact Properties
| Elongation A min. % | Absorbed Energy KV Min. % | ||
|---|---|---|---|
| l | t | l at 20°C | t at 20°C |
| 22 | 20 | 40 | 27 |
Temperature - Proof Strength Ratings
| Minimum Proof Strength Rp0.2 at different temperatures, MPa | ||||||||
|---|---|---|---|---|---|---|---|---|
| 100 °C | 150 °C | 200 °C | 250 °C | 300 °C | 350 °C | 400 °C | 450 °C | 500 °C |
| 243 | 237 | 224 | 205 | 173 | 159 | 156 | 150 | 146 |
3. Heat treatment conditions
The 16Mo3 / 1.5415 alloy steel pipe shall be normalized at a temperature between 890 °C and 950 °C and then be cooled in ambient temperature.