Nuclear Power Plant Alloy Steel Pipes

• ​Introduction

Nuclear power plant alloy steel pipes are critical components in nuclear power systems, primarily used in high-temperature, high-pressure, and corrosive environments such as reactor coolant systems, steam pipelines, and auxiliary systems. These pipes must withstand extreme conditions while ensuring the safe and stable operation of nuclear facilities. Their reliability directly impacts the safety and economic efficiency of nuclear power plants.

• ​Main Functions

Medium Transportation：Transport high-temperature and high-pressure fluids (e.g., reactor coolant, steam, and chemical reagents) to ensure the normal circulation of the nuclear power system.

Structural Support：Provide structural support for key equipment in nuclear islands, such as steam generators and pressure vessels, and maintain the integrity of the pipeline system.

Safety Barrier：As part of the containment system, they prevent radioactive material leakage and enhance the overall safety of the nuclear power plant.

• ​Tubing Standards

ASTM A213；ASTM A335； EN 10216-2； GB/T 24512.2；GB/T 5310.

• ​Material & Performance

T22/ P22，T36/ P36，T91/ P91，T92/ P92； 10CrMo9-10，15NiCuMoNb5-6-4，X10CrMoVNb9-1，X10CrWMoVNb9-2； 12Cr2MoG，15NilMnMoNbCu，10Cr9Mo1VNbN，10Cr9MoW2VNbBN；

High-Temperature Strength：Maintain mechanical properties (e.g., yield strength, tensile strength) at temperatures up to 600°C. Corrosion Resistance：Resist erosion from radioactive media, coolant chemicals, and high-pressure water. Radiation Resistance：Minimize radiation-induced degradation of mechanical properties over long service life. Tightness：Ensure leak-proof performance through strict non-destructive testing (NDT) such as ultrasonic and radiographic inspection.

• ​Manufacturing Process

Raw Material Preparation：High-purity alloy steel billets are selected and inspected for chemical composition and impurities.

Hot Rolling：The billet is heated and rolled into a hollow tube via a piercing mill, or extruded to form the initial pipe shape.

Heat Treatment： Normalizing：Improves microstructure and mechanical properties. Tempering：Reduces internal stress and enhances toughness.

Cold Drawing/Expanding (Optional)：Fine-tunes dimensions and surface finish for precise applications.

Non-Destructive Testing (NDT)：Ultrasonic testing (UT), eddy current testing (ET), and hydrostatic pressure testing are conducted to ensure freedom from defects.

Surface Treatment：Deburring, coating, and marking for identification and protection.

• Specifications