Low-alloy high-strength steel is currently the most widely used material in petrochemical equipment.
- Key Reasons: Low-alloy high-strength steel perfectly meets the comprehensive material requirements of petrochemical equipment:
- Balanced Performance: With only a small amount of alloying elements (such as Mn, Si, Cr, etc.), it significantly improves strength and corrosion resistance while retaining the good machinability and weldability of carbon steel, meeting the needs of most conventional petrochemical equipment such as pressure vessels, storage tanks, pipelines, and towers;
- Controllable Cost: Compared with stainless steel and special alloys, it is lower in cost and more economical, making it suitable for large-scale applications.
Application limitations of other materials:
- Stainless steel: Excellent corrosion resistance but high cost; only used in special scenarios with highly corrosive media such as sulfur and chlorine, limiting its applicability.
- Heat-resistant steel: Only for special high-temperature conditions (such as pyrolysis furnace tubes); a scenario-specific material, not used in general equipment.
- High-quality carbon steel: Insufficient strength and corrosion resistance, making it difficult to adapt to the complex high-pressure and corrosive conditions of petrochemical equipment; its application range is gradually shrinking.