ASTM A387 Grade 11 welded steel pipe: ideal for high temperature and high pressure environments
ASTM A387 Grade 11 welded steel pipe is a chromium-molybdenum alloy steel pipe designed for high temperature and high pressure environments. With its excellent high temperature resistance, corrosion resistance and high strength, it is widely used in key industrial fields such as energy, chemical industry, and oil refining.
1. Core advantages: the perfect combination of high temperature resistance and corrosion resistance
High temperature strength: Grade 11 steel contains 1.25% chromium (Cr) and 0.5% molybdenum (Mo), maintains stable mechanical properties below 550℃, has outstanding creep resistance, and is suitable for long-term high temperature environments.
Hydrogen corrosion resistance: Alloy elements form a dense oxide film, which effectively resists hydrogen embrittlement and sulfide corrosion, and prolongs the life of the pipeline.
Excellent welding performance: low carbon equivalent (CEV), no complex preheating or post-weld heat treatment is required during welding, reducing construction costs.
2. Application areas: the cornerstone of energy and industry
Petroleum refining: as a hydrogenation reactor and cracking furnace pipeline, it handles high-temperature hydrogen and oil and gas mixtures.
Power industry: The main steam pipeline of supercritical/ultra-supercritical generator sets withstands high temperatures above 600°C and pressures of 25MPa.
Chemical process: Reactor connecting pipelines that transport corrosive media (such as sulfur-containing gases and acidic solutions).
New energy field: The molten salt transportation system of solar thermal power stations requires the material to maintain stability for more than ten years at 500°C.
3. Usage scenario: Reliable choice in harsh environments
High-pressure steam system: The main steam pipeline of a thermal power plant must meet both high-temperature strength and fatigue resistance.
Hydrogenation unit: The hydrodesulfurization and hydrocracking units of a refinery, where the pipeline is exposed to high-temperature and high-pressure hydrogen for a long time.
Coal chemical industry: The outlet pipeline of a coal gasifier withstands erosion by coal ash particles and corrosion by CO/H₂ mixed gas.
Overseas projects: Industrial facilities in high-temperature and high-humidity areas such as the Middle East and Southeast Asia need to resist chloride ion corrosion in tropical climates.
4. Industry Standards and Certifications
The ASTM A387/A387M standard is implemented, and ASME BPVC Section IX welding certification can be provided.
Applicable to ASME B31.1 (power piping) and B31.3 (process piping) specifications, meeting the requirements of secondary piping in nuclear power plants.
Some products are certified by NACE MR0175 and can be used in sour environments containing H₂S.
ASTM A387 Grade 11 welded steel pipe has become an indispensable infrastructure material for modern industry due to its reliability under extreme conditions. From the core equipment of refineries to innovative applications in the field of new energy, this material continues to provide security for the safe and efficient operation of the global energy and chemical industry.
