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15CrMoG seamless steel pipe is a chromium–molybdenum alloy steel used in high-temperature and high-pressure environments. Its strong thermal stability and oxidation resistance make it widely used in power generation, petrochemicals, and boiler manufacturing.
Chemical Composition of 15CrMoG Seamless Steel Pipe
The primary alloying elements of 15CrMoG alloy steel pipe include:
Chromium (1.00%–1.50%) for oxidation resistance
Molybdenum (0.45%–0.65%) for high-temperature and creep strength
Controlled C, Si, Mn, P, S to maintain overall stability
These alloy additions give the steel excellent long-term performance under heat and pressure.
Manufacturing Process of 15CrMoG Seamless Steel Pipe
15CrMoG seamless steel pipes are produced using:
Hot rolling: high efficiency, suitable for mass production
Cold drawing: higher precision and better surface quality
Both methods require strict control of temperature and deformation. Heat treatments such as normalizing and tempering ensure stable microstructure and mechanical properties.
Mechanical & High-Temperature Properties of 15CrMoG Alloy Steel Pipe
Key performance parameters include:
Tensile strength: 440–640 MPa
Yield strength:≥295 MPa
Elongation:≥21%
Stable strength below 500°C; short-term limit ~550°C
Thermal expansion: ~12.5×10⁻⁶/°C
Thermal conductivity: ~42.7 W/(m·K)**
These properties make 15CrMoG ideal for long-term high-temperature, high-pressure operation.
Applications of 15CrMoG Seamless Steel Pipe
Power Industry
Superheater tubes
Reheater tubes
Main steam pipelines (supercritical / ultra-supercritical boilers)
Petrochemical Industry
Hydrogenation reactors
Catalytic cracking equipment
High-temperature process piping
Boiler Manufacturing
High-pressure boiler heating surface tubes
It is also used in nuclear power, metallurgy, and mechanical equipment where heat resistance is essential.
Material Comparison: 15CrMoG Seamless Steel Pipe vs. Carbon Steel & Other Alloy Pipes
Compared to carbon steel:
2–3×higher high-temperature strength
Better oxidation resistance and microstructural stability
Compared to 12Cr1MoVG:
Lower alloy cost with sufficient performance for most medium–high temperature conditions
Compared to P91/P92:
Lower strength at extreme temperatures but
Superior weldability and machinability
Welding Guidelines for 15CrMoG Seamless Steel Pipe
To avoid cracking and property degradation:
Preheat: 150–200°C
Interpass temperature:≤300°C
Post-weld tempering: 680–720°C
Filler metals: E5515-B2 or equivalents
Control heat input to prevent overheating
Market Outlook for 15CrMoG Seamless Steel Pipe
With the growth of:
Supercritical & ultra-supercritical power plants
High-temperature petrochemical processing
Industrial equipment upgrades
Demand for 15CrMoG alloy steel pipes continues to rise. Major suppliers include Baosteel, Tianjin Pipe, and Valin Henggang.
Maintenance & Storage of 15CrMoG Seamless Steel Pipe
To ensure long service life:
Inspect for wall thinning, oxidation, creep deformation
Replace components showing structural degradation
Store in dry, non-corrosive conditions
Protect pipes from impact during transport
Conclusion:
15CrMoG seamless steel pipe provides:
Superior high-temperature strength
Long-term oxidation resistance
Excellent stability under extreme working conditions
It remains an essential and cost-effective material for modern high-temperature, high-pressure industrial systems. As technology advances, its performance and application range will continue to expand.
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