Due to its comprehensive performance of high temperature resistance, high pressure resistance, and corrosion resistance, alloy steel pipe plays a key role in the following industrial fields:
1. Power Station Boilers
Seamless steel tubes for high-pressure boilers (GB/T 5310) are the core material for power station boilers. Typical applications include: water wall tubes (commonly 20G), superheater and reheater tubes (commonly 15CrMoG, 12Cr1MoVG), and headers and main steam pipelines (commonly 12Cr1MoVG, P91/T91).
2. Petrochemical Industry
Seamless steel tubes for petroleum cracking (GB/T 9948) are used for furnace tubes, heat exchanger tubes, and fluid transport pipelines in oil refining. Grades such as Cr5Mo and 1Cr5Mo are commonly used in hydrogenation units due to their good resistance to hydrogen attack and sulfidation corrosion.
3. Fertilizer Equipment
Seamless steel tubes for high-pressure chemical fertilizer equipment (GB/T 6479) are used for high-pressure pipelines in urea, synthetic ammonia, and other plants. Representative grades include 10MoWVNb, 15CrMo, etc.
Material Selection Principles:
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Temperature conditions: The higher the operating temperature, the higher the required content of Cr, Mo, and V alloys.
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Pressure rating: Select the corresponding wall thickness grade (Sch) based on the design pressure.
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Medium characteristics: For corrosive media, grades with higher Cr content should be selected.
Applicable Scenarios: High-temperature and high-pressure piping systems in electric power, petrochemicals, chemicals, nuclear energy, aerospace, and other fields.
