What are the steps for acceptance of hot-dip galvanized steel pipes:
1. Hot-dip galvanized steel pipes should be submitted for acceptance in batches, and the batching rules should meet the requirements of the corresponding product standards.
2. The inspection items, sampling quantity, sampling location and test methods of hot-dip galvanized steel pipes shall be in accordance with the provisions of the corresponding product standards. Subject to the consent of the purchaser, hot-rolled seamless hot-dip galvanized steel pipes can be sampled in batches according to the rolled root group.
3. Hot-dip galvanized steel pipe test results. When a certain item does not meet the requirements of the product standard, the unqualified ones shall be singled out, and double number of samples shall be taken from the same batch of hot-dip galvanized steel pipes for failure. Reinspection of the project. If the re-inspection result (including any index required by the project test) is unqualified, the batch of hot-dip galvanized steel pipes shall not be delivered. The following inspection items are not allowed to be re-inspected when the initial inspection is unqualified: a. There are white spots in the macrostructure; b. Microstructure.
4. For hot-dip galvanized steel pipes with unqualified re-inspection results (including the unqualified microstructure of the initial inspection results and items that are not allowed to be re-inspected), the supplier may submit for acceptance one by one; or re-heat treatment (the number of re-heat treatments shall not exceed two Times), submit a new batch for acceptance.
5. If there are no special regulations in the product standard, the chemical composition of the hot-dip galvanized steel pipe shall be checked and accepted according to the melting composition.
The iron pipes used for gas, greenhouses, and heating are also hot-dip galvanized steel pipes. Hot-dip galvanized steel pipes are used as water pipes. Large amounts of rust are generated in the pipes. The outflowing yellow water not only pollutes sanitary ware, but also contains bacteria and rust that breed on the uneven inner wall. The heavy metal content in the water is too high, which seriously endangers human health. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and gradually banned hot-dip galvanized steel pipes.
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