1. Certification
Classification Society Steel Pipes: Must be certified by specific classification societies, such as China Classification Society (CCS), Det Norske Veritas (DNV), Lloyd's Register (LR), etc. These certification requirements are strict and must comply with the specifications and standards of the corresponding classification societies. For example, the classification society-certified seamless steel pipes used for the manufacture of seamless steel pipes for marine boilers and superheaters and Class I and II pressure pipe systems must follow specific specifications such as China Classification Society CCS Specifications 360, 410, 440, 490, etc.
Ordinary steel pipes: Generally, they only need to comply with the general standards of the country or industry, and do not need to pass the certification process of a specific classification society. Certification and supervision are relatively loose.
2. Scope of application
Classification Society Steel Pipes: Mainly used in ship-related fields, such as marine boilers, superheaters, and key parts such as Class I and II pressure pipe systems, which play a vital role in the safety and performance of ships. Because ships operate in the marine environment and face complex working conditions and harsh use conditions, the quality and performance requirements of steel pipes are extremely high.
Ordinary steel pipes: have a wide range of applications, covering many fields such as construction, machinery manufacturing, agricultural irrigation, urban water supply, etc., but the requirements for the use environment and working conditions are relatively low.
3. Standard requirements
Classification society steel pipes: have strict standards in terms of materials, manufacturing processes, inspection and testing. In terms of materials, specific materials are often used, such as 410, 360, etc., and there are clear regulations on chemical composition, such as residual elements Cr≤0.25%, Mo≤0.10%, Ni≤0.30%, Cu≤0.30%, total amount≤0.70%, etc.; the relevant process specifications must be strictly followed during the manufacturing process to ensure the stable and reliable quality of the steel pipe; the inspection and testing links are more stringent and comprehensive, and multiple tests and inspections must be carried out.
Ordinary steel pipes: The standard requirements are relatively low. In terms of material selection, manufacturing process and inspection and testing, there is a certain degree of flexibility according to different use scenarios and requirements, but the overall quality and performance requirements are not as high as those of classification society steel pipes.
4. Supply and market
Classification society steel pipe: The supply period is usually longer because its production and certification process is more complicated. It needs to be shipped together with the certified seamless steel pipe to ensure product quality and traceability. Its market is mainly for shipbuilding, maintenance and other related industries, and the market demand is closely related to the development of the shipbuilding industry.
Ordinary steel pipe: The supply period is relatively short, and production and supply are more flexible. Its market is widely distributed, covering multiple industries and fields, and the market demand is affected by the macroeconomic environment and the development of various industries.
5. Corrosion resistance
Classification society steel pipe: Since ships are in the marine environment for a long time, steel pipes need to have excellent corrosion resistance, oxidation resistance and wear resistance to resist the erosion of seawater and the corrosion of the marine atmosphere.
Ordinary steel pipe: If the use environment does not have a strong corrosive medium, the corrosion resistance requirements are relatively low; if used in a certain corrosive environment, its corrosion resistance is not as good as the classification society steel pipe designed for the marine environment.
