The national standard for galvanized steel pipes has very strict quality control requirements, which are mainly reflected in the following aspects:
1. Appearance quality: The surface of galvanized steel pipes should be flat and smooth, without defects such as cracks, pitting, oxide scale, oil stains, etc., and 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 comply with the requirements of national standards or industry standards, such as tensile strength, yield strength, elongation, and other indicators, to ensure that the steel pipes can withstand various external forces during use.
3. Coating quality: The thickness of the galvanized layer should meet the standard requirements. Usually, the average thickness of the galvanized layer should not be less than a certain value (the specific value varies according to different standards) and should have good adhesion and corrosion resistance. The coating should be uniform and continuous without peeling, missing plating, etc.
4. Dimensional deviation: The dimensional deviation of galvanized steel pipes should comply with the requirements of national standards or industry standards, including the deviation range of outer diameter, wall thickness, length, and other dimensions. This helps ensure that the steel pipe will match other components or equipment during installation and use.
5. Physical properties: The physical properties of galvanized steel pipes such as density, thermal expansion coefficient, etc. should also comply with relevant standards to ensure the stability and reliability of the steel pipes 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 by hot forging or oxidation printing, and the packaging should comply with relevant national technical standards and should include product identification, length, quantity, and other information. The manner and content of marking and packaging must be clear, accurate, easily identifiable, and traceable.
In short, the national standard requirements for quality control of galvanized steel pipes cover many aspects such as appearance quality, mechanical properties, coating quality, dimensional deviation, and physical properties to ensure that the quality and safety performance of steel pipes meet the standard requirements. When producing, purchasing, and using galvanized steel pipes, relevant standards must be followed to ensure that they meet national requirements and actual application needs.
Post time: Mar-19-2024