What material is 16MO3 seamless boiler tube made of

16MO3 seamless boiler tube is a chromium-molybdenum alloy low alloy steel seamless tube. Its material characteristics and application core are as follows:

1. Core material composition

Carbon (C): content 0.12%~0.20% ("16" in the name represents carbon content of about 0.16%);
Molybdenum (Mo): content 0.25%~0.35% ("Mo3" means molybdenum content is about 0.3%);
Chromium (Cr): content 0.30%~0.50%, enhance high temperature oxidation resistance;
Manganese (Mn): content 0.40%~0.90%, improve strength and toughness;
Other elements: Silicon (Si), phosphorus (P), sulfur (S) content is strictly controlled to ensure welding and processing performance.

2. Core characteristics ‌
‌High temperature resistance‌:
Long-term service temperature ‌≤550℃‌, short-term tolerance ‌580℃‌, suitable for high-temperature components such as boiler superheaters and reheaters;
Chromium-molybdenum alloy synergistic effect, high-temperature corrosion rate ‌≤0.1 mm/year‌ (540℃ steam environment).
‌Mechanical properties‌:
Room temperature tensile strength ‌440~590 MPa‌, yield strength ‌≥260 MPa‌, excellent pressure bearing capacity;
Good high-temperature creep resistance (stable long-term strength at 550℃).
‌Process performance‌:
Requires ‌normalizing‌ (the structure is ferrite + pearlite) to ensure high-temperature structure stability;
Requires ‌150~200℃ preheating‌ and post-weld heat treatment during welding to avoid cold cracks.

3. Core application industries ‌
‌Boiler manufacturing‌: high-pressure boiler superheater tubes, economizer tubes and main steam pipelines (working temperature 450~550℃); ‌Pressure vessels‌: hydrogenation reactors in the petroleum and chemical industries, catalytic cracking unit shells (design pressure ≤15 MPa); ‌Energy equipment‌: power station high-temperature water supply pipelines, heat exchange system heat transfer tubes.

4. Material advantages ‌‌High cost performance‌: The cost is 30%~40% lower than that of high-end alloys such as P91/P92, suitable for medium temperature and high pressure conditions; ‌‌Safety and reliability‌: seamless structure has no weld defects, and the pressure safety is better than welded pipes; ‌‌Long life design‌: The design life is ≥150,000 hours (typical value for petrochemical units) under working conditions below 540℃; ‌‌Strong standard compatibility‌: It complies with the European standard EN 10216-2 and is compatible with the technical requirements of the national standard GB 5310 high-pressure boiler tubes.