Boiler Stainless Steel Tube

• ​Introduction

Boiler stainless steel tubes are essential components in boiler systems, specifically designed to handle the rigorous conditions of heat transfer, high pressure, and corrosive environments. Composed of stainless steel alloys, these tubes serve as critical pathways for the movement of water, steam, or other heat-transferring media, enabling efficient energy conversion in various industries such as power generation, chemical processing, and industrial heating.

• ​Main Functions

Heat Transfer Medium Conduction：Serve as channels for water, steam, or thermal oil to circulate, facilitating efficient heat exchange between the boiler’s combustion chamber and the working medium.

Pressure Resistance：Maintain structural integrity under high internal pressure to prevent leaks or explosions, ensuring safe operation of the boiler system.

Corrosion Resistance：Resist oxidation and chemical corrosion from impurities in water (e.g., chloride, sulfate) and flue gas, extending the boiler’s service life.

Thermal Stability：Withstand rapid temperature changes (thermal shock) during startup, shutdown, or load adjustments without cracking.

• ​Tubing Standards

ASTM A213 ; EN 10216-5； GB/T 13296.

• ​Material & Performance

304/304L/304H,316/316L,321,310S.

Key Performance Traits: Corrosion Resistance: Resistant to oxidation, pitting, and crevice corrosion, with different grades varying in corrosion resistance based on their composition.​ Mechanical Strength: Tensile strength and yield strength meet relevant standards, ensuring the tubes can withstand certain pressure and mechanical loads. For example, the tensile strength of 304 is ≥515 MPa, and the yield strength is ≥205 MPa.​ High-Temperature Performance: Different grades havex different high-temperature tolerance. 310S can withstand high temperatures up to 1200°C, while 321 is suitable for temperatures around 800°C.

• ​Manufacturing Process

Raw Material Selection: Choose high-quality stainless steel billets or ingots that meet the required grades and standards.​

Hot Working: Heat the billets to a certain temperature and perform processes such as piercing (for seamless tubes) or welding (for welded tubes) to form the initial tube shape.​

Cold Working: Conduct cold rolling or cold drawing to achieve precise dimensions, smooth surface finish, and improve mechanical properties.​

Heat Treatment: Carry out annealing, solution treatment, or other heat treatments to eliminate internal stress, optimize the microstructure, and enhance performance.​

Inspection and Testing: Perform non-destructive testing (such as ultrasonic testing, eddy current testing) and pressure testing to ensure the quality and performance of the tubes meet standards.​

Surface Treatment: Conduct pickling, passivation, or other surface treatments to remove oxides and impurities, forming a protective film to improve corrosion resistance.

• Specifications