Offshore Engineering Pipe

• ​Introduction

Offshore engineering stainless – steel pipe is a key component in marine engineering. It is mainly used in offshore platforms, subsea oil and gas pipelines, seawater desalination systems and other facilities. The marine environment is complex and changeable, with characteristics of high salinity, high humidity and the presence of various corrosive substances, which puts forward extremely high requirements for pipeline materials. Stainless – steel pipes, with their excellent corrosion resistance and high – strength properties, have become an ideal choice for marine engineering.

• ​Main Functions

Ensure safe fluid transportation: It is responsible for transporting various fluids, such as oil, gas, seawater, and chemical liquids. Its high – pressure resistance and corrosion resistance can ensure the safety and stability of fluid transportation, and reduce the risk of leakage.

Support the operation of marine facilities: In offshore platform construction, stainless – steel pipes are used in support structures, which can withstand various complex stresses and loads in the marine environment, ensuring the long – term stable operation of offshore platforms.

Improve the efficiency of seawater desalination: In seawater desalination systems, stainless – steel pipes are used as heat – transfer pipe materials, which can efficiently transfer heat and improve desalination efficiency.

• ​Tubing Standards

ASTM A312，ASTM A790; EN 10216-5，EN 10217-7； GB/T 14976，GB/T 21832，GB/T 21833.

• ​Material & Performance

Materials: Common materials include austenitic stainless steels such as 316L, and duplex stainless steels such as 2205 and 2507；Or use 1.4404, 1.4462, 1.4410.

Performance: It has excellent corrosion resistance, especially resistance to seawater corrosion. The chromium in stainless steel forms a passive oxide film on the surface, which can resist the erosion of chloride, salt and other substances. It also has high strength and can withstand high – pressure environments in the ocean, and some materials can also maintain good performance in high – temperature environments. At the same time, it has good fatigue resistance and can resist the impact of waves and the wear of marine organisms.

• ​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