- Equipment code : CFIHOS-30000496
Description
Galvanized Seamless Pipe
Types of Galvanization:
Galvanized seamless pipes are categorized into two types: cold-plated steel seamless pipes and hot dip seamless pipes.
Hot Dip Seamless Pipe
Description:
Hot dip seamless pipes undergo a process where molten metal reacts with the iron substrate, forming an alloy layer that bonds with both the substrate and the coating. This method begins with steel pickling to remove surface iron oxide, followed by immersion in a tank containing a cleaning solution of ammonium chloride, zinc chloride, or a mixture of both, before being immersed in the hot dip tank. The resulting hot dip galvanized coating exhibits uniformity, strong adhesion, and exceptional durability.
Cold-Plated Seamless Pipe
Description:
Cold-plated seamless pipes, including electro-galvanized options, feature a smaller coating of only 10-50g/m2. Their corrosion resistance is lower compared to hot dip galvanized pipes. Major galvanized pipe manufacturers generally avoid electro-galvanizing due to quality concerns, opting instead for hot dip galvanization. The Ministry of Construction has mandated the phasing out of cold galvanized pipes due to outdated technology, restricting their use for water and gas pipes.
Mechanical Properties
Description:
The mechanical properties of galvanized seamless pipes are crucial indicators of their performance. These properties, including tensile strength, yield strength, elongation, hardness, and toughness, are determined by the steel's chemical composition and heat treatment. Compliance with specific steel standards ensures that these pipes meet the required performance criteria for various applications, including high and low-temperature environments.
Summary
Galvanized seamless pipes offer corrosion resistance through either hot dip or cold-plated methods. Hot dip galvanized pipes provide superior durability and are widely used across industries for their robust coating. In contrast, cold-plated options, though cheaper, are increasingly restricted due to their limited corrosion resistance. Understanding these distinctions helps in selecting the appropriate pipe for specific applications based on performance and longevity requirements.
Supporting Documents
General Terms
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