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Liuyang High-Tech Industrial Area, Changsha China
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Ensure reliable, long-lasting performance in high-temperature and high-pressure service with our Premium CrMo Alloy Steel Pipes and Flanges. Manufactured from high-quality Chromium-Molybdenum (CrMo) alloy steels such as ASTM A335 P5, P9, P11, P22, P91, and similar grades, these components are engineered to withstand severe thermal and mechanical stresses. The addition of chromium enhances high-temperature strength, oxidation resistance, and corrosion resistance, while molybdenum improves creep strength and toughness at elevated temperatures. Available in seamless and welded forms, these pipes and flanges are the backbone of critical systems in demanding industries, offering superior performance and safety compared to carbon steel.
High-Temperature Strength: Maintains excellent tensile and yield strength at operating temperatures exceeding 1000°F (538°C), resisting deformation and creep.
Enhanced Oxidation Resistance: Chromium forms a stable, protective oxide layer (Cr2O3) that minimizes scaling and material loss in oxidizing atmospheres.
Improved Creep Resistance: Molybdenum addition significantly enhances resistance to time-dependent deformation under constant stress at high temperatures.
Good Sulfidation Resistance: Offers better resistance to sulfur-containing environments compared to plain carbon steels.
Weldability & Fabrication: Designed to be weldable using appropriate preheat, post-weld heat treatment (PWHT), and compatible filler metals, following strict procedures (ASME B31.3).
Comprehensive Standards Compliance: Manufactured to stringent specifications like ASTM A335 (seamless pipe), A234 (wrought fittings), A182 (forged flanges/fittings), ASME SA335, SA234, SA182, ensuring material integrity and traceability.
Power Generation: High-pressure steam lines (main steam, hot reheat), boiler tubes, superheater/reheater headers and piping, turbine bypass systems.
Petrochemical & Refining: Process piping in catalytic crackers, reformers, hydrotreaters, cokers, ethylene crackers (high-temperature transfer lines).
Chemical Processing: Reactor effluent lines, heat exchanger piping, high-temperature process streams involving corrosive media.
Oil & Gas: Production and transmission lines for high-temperature/high-pressure (HPHT) wells, geothermal energy systems.
Q: Why choose CrMo alloy over carbon steel for high-temp service?
A: Carbon steel rapidly loses strength and oxidizes (scales) above 800°F. CrMo alloys retain strength, resist oxidation, and withstand creep deformation far better, ensuring system integrity and safety at elevated temperatures.
Q: What is the difference between grades like P5, P9, P11, P22, P91?
A: Grades differ in their specific chromium and molybdenum content, and sometimes other alloying elements (e.g., vanadium, niobium in P91). This gives them varying high-temperature strength limits, oxidation resistance levels, and weldability characteristics. P91 offers the highest strength among common grades.
Q: Why is PWHT (Post Weld Heat Treatment) critical for CrMo welds?
A: Welding creates a brittle microstructure (martensite) in the heat-affected zone (HAZ). PWHT (tempering) relieves residual stresses and transforms this brittle structure into a tougher one, essential to prevent cracking during service, especially under thermal cycling.
