The national standards for galvanized steel pipe have very strict quality control requirements, primarily reflected in the following aspects:
1. Appearance Quality: The surface of galvanized steel pipes should be flat and smooth, free of defects such as cracks, pitting, scale, and oil stains. The inner and outer surfaces should be consistent. The coating should be uniform and free of obvious defects and bubbles.
2. Mechanical Properties: The mechanical properties of galvanized steel pipes should meet the requirements of national or industry standards, such as tensile strength, yield strength, and elongation, to ensure that the steel pipes can withstand various external forces during use.
3. Coating Quality: The thickness of the galvanized layer should meet standard requirements. Generally, the average thickness of the galvanized layer should not be less than a certain value (the specific value varies depending on the standard) and should have good adhesion and corrosion resistance. The coating should be uniform and continuous, without flaking or missing plating.
4. Dimensional Deviation: The dimensional deviation of galvanized steel pipes should meet the requirements of national or industry standards, including the deviation range for dimensions such as outer diameter, wall thickness, and length. This helps ensure that the steel pipes are compatible with other components or equipment during installation and use.
5. Physical Properties: The physical properties of galvanized steel pipes, such as density and coefficient of thermal expansion, must also comply with relevant standards to ensure their stability and reliability under various environmental conditions.
In addition, the marking and packaging of galvanized steel pipes must also comply with relevant national standards. Steel pipes should be marked using hot forging or oxidation stamping, and packaging must comply with relevant national technical standards and include product information such as product logo, length, and weight. The marking and packaging must be clear, accurate, and easily identifiable and traceable.
In summary, the national standard for galvanized steel pipe quality control requirements covers multiple aspects, including appearance quality, mechanical properties, coating quality, dimensional deviation, and physical properties, to ensure that the quality and safety of galvanized steel pipes meet standard requirements. When producing, purchasing, and using galvanized steel pipes, adherence to relevant standards is essential to ensure that galvanized steel pipes meet national requirements and actual application needs.
Post time: Sep-08-2025