15crmo Seamless Steel Pipe

15CrMo seamless steel pipe belongs to the pearlitic low-alloy heat-resistant seamless steel pipe category, with a carbon content of approximately 0.15%. Chromium and molybdenum are the core alloying elements, making it an alloy pipe material specifically designed for medium-temperature and medium-pressure applications. It is graded into ordinary structural grade and boiler-specific grade (15CrMoG, suffix G indicating boiler steel). The mainstream standards are GB/T 5310 "Seamless Steel Tubes for High-Pressure Boilers," GB/T 6479 "Seamless Steel Tubes for High-Pressure Fertilizer Equipment," and GB/T 8162 "Seamless Steel Tubes for Structural Use," primarily targeting high-temperature and pressure-bearing applications in power, petrochemical, and thermal industries.

Key Performance Advantages

1. Stable Mechanical Properties at Medium and High Temperatures: Maintains excellent high-temperature creep strength and oxidation resistance even below 550℃. No significant aging or grain coarsening issues occur during long-term high-temperature service. Its load-bearing capacity is far higher than 20G carbon steel pipes, making it the standard material for medium-temperature boilers and thermal pipelines.

2. Outstanding Resistance to Hydrogen Corrosion: Chromium and molybdenum elements synergistically enhance resistance to hydrogen erosion. There is no risk of hydrogen embrittlement or hydrogen-induced cracking under medium-temperature, high-pressure hydrogen-containing environments, making it a core selection for oil refining hydrotreating units and hydrogen-containing medium transportation pipelines.

3. Good Welding and Construction Compatibility: The low carbon content combined with a mature alloy system allows for controllable hardening tendency. Reliable welding can be achieved through standardized preheating and post-weld heat treatment. The construction process is highly mature, with a significantly lower barrier to entry than high-chromium martensitic heat-resistant steel.

4. High Reliability During Long-Term Service: The pipe has a uniform internal structure and is seamlessly integrally formed without weld seams or weak points. It has long fatigue and creep resistance, with a continuous service life more than three times that of ordinary carbon steel pipes, significantly reducing maintenance and replacement costs. 5. Excellent Cost-Effectiveness

It can cover most medium-temperature and medium-pressure thermal and petrochemical conditions, with procurement costs only 80% of 12Cr1MoVG and about 30% of P91 heat-resistant steel, demonstrating significant economic advantages within its suitable temperature range.

What is the maximum temperature resistance of 15CrMo seamless pipe? What pressure can it withstand?

The long-term stable service temperature does not exceed 550℃, and the short-term peak temperature can withstand 580℃. Exceeding the temperature will accelerate oxidation and performance degradation. Pressure resistance is positively correlated with pipe diameter, wall thickness, and design temperature. Standard specifications can withstand pressures of 10~32MPa at room temperature. For medium-temperature conditions, pressure ratings can be accurately matched through wall thickness calculations.

Can 15CrMo transport hydrogen-containing and sulfur-containing media? How is its corrosion resistance?

The core advantage of 15CrMo is its resistance to hydrogen corrosion, making it the mainstream material for medium-temperature and high-pressure hydrogenation units and hydrogen-containing oil transportation, with no risk of hydrogen embrittlement cracking. It has a certain degree of resistance to low-concentration sulfides, but for high-sulfur and highly corrosive conditions, it is recommended to upgrade to stainless steel pipes or perform internal anti-corrosion treatment.