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Boiler steel pipe 15Mo3 is a steel pipe in the DIN17175 standard. It is a small-diameter carbon molybdenum steel pipe for boilers and superheaters. It is a pearlite-type heat-strength steel. China transplanted it to GB5310 in 1995 and named it 15MoG. Its chemical composition is simple, but it contains molybdenum, so its thermal strength performance is better than that of carbon steel while maintaining the same process performance as carbon steel. Because of its good performance and low price, it has been widely used in countries around the world.
However, this steel has a tendency to graphitize after long-term operation at high temperatures, so its operating temperature should be controlled below 510°C. During smelting, the amount of Al added should be limited to control and delay its graphitization process. 15Mo3 alloy steel pipe is mainly used in low-temperature superheaters and low-temperature reheaters, and the wall temperature is below 510°C.
Heat treatment temperature of DIN 17175 15Mo3 Seamless Steel Tubes
| Steel Grade | Thermal processing ℃ | Normalizing℃ | Tempering | ||
| Grade | Material number | Quenching temperature ℃ | Tempering temperature ℃ | ||
| 15mo3 | 1.5415 | 1100 to 850°C | 910-940 | - | - |
Chemical composition of DIN 17175 15Mo3
| Standard:DIN 17175 | grade | Chemical composition | |||||
| C | Si | Mn | P,S | Cr | Mo | ||
| 15mo3 | 0.12-0.20 | 0.10-0.35 | 0.40-0.80 | ≤0.030 | / | 0.25-0.35 | |
Mechanical property of DIN 17175 15Mo3
| Standard | grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) |
| DIN 17175 | 15mo3 | 450-600 | ≥270 | ≥20 |
low alloy structural steel pipe
heat treatment
Quenching: First preheat to 550℃~650℃, then heat to 800~850℃ and quench in oil. Tempering: Heating to 150℃~200℃, staying at this temperature, and then quenching in still air. Hardness: HRC60℃ or above Annealing: Heat to 750~800℃, stay at this temperature for one to three hours, and let it gradually cool down in the furnace.
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