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Frequently Asked Questions (1) At present, due to the chaotic state of the material market, profit motives, and a lack of awareness regarding the importance of material quality and safety, some distributors and manufacturers engage in fraud by altering the contents of material quality certificates before providing copies to customers. (2) Some material control personnel in pressure vessel manufacturing plants lack a sense of responsibility and are not principled enough; for economic gains, they engage in practices such as mixing material quality certificates across multiple products or even between different materials. (3) After the materials arrive at the factory, marking for inspection and labeling are not carried out in a timely manner. Materials are not stored properly; carbon steel is mixed with stainless steel, and structural steel is mixed with steel used for containers, which makes it very easy to make mistakes during material retrieval and distribution. Countermeasure 1: Suppliers – Large steel mills should be recognized by **safety supervision agencies**, and **mandatory quality certification** should be imposed on these mills, with strict supervision and inspection in place. However, since it does not accept orders from small users who place purchases in single batches or in small quantities, the manufacturer can identify and announce some reliable first-level agents, allowing the factory to place orders through these agents. 2. Intermediate distributors should pay attention to the quality of the products supplied by their suppliers, as well as the competence of the staff responsible for handling those products. It is necessary to understand the production situation across the country and select suppliers whose quality assurance capabilities, scale, and reputation have been verified. One should not seek cheap prices; instead, careful consideration should be given to the reliability of the supplier’s quality. This involves more than simply trusting the product samples or business license provided by the supplier – it is also important to conduct a more in-depth investigation into the supplier’s quality management system and past performance. In accordance with relevant requirements, it is necessary to conduct quality assessments of suppliers on an annual basis. 3. Material quality certificate: For those who can only provide a copy of the material quality certificate, in addition to requiring the inspection (red) stamp of the material supplier and the handler’s (red) stamp, it is also necessary for the legal representative to sign and affix their personal seal, along with indicating where the original document is kept ； When the quantity purchased is less than that specified in the quality certificate for the materials in question, or when there are multiple batches of materials listed on the certificate and the container manufacturer is unable to purchase all of them, resulting in the distributor being unable to deliver the original quality certificate to the customer, the distributor may be asked to provide both a copy and the original as required. Once the material inspectors from the manufacturing plant verify that there are no differences between the original and the copy, the original will be returned to the distributor, who shall then write on the copy the statement “Copy is identical to the original” and affix a (red) stamp to it. 4. Material traceability: Most manufacturing plants have their own fairly comprehensive systems for ensuring material traceability, including regulations regarding labeling and marking of materials, and these regulations are generally followed in actual production. However, the situation in some plants is not so favorable. Some manufacturers illegally replace the material quality certificates in order to use cheaper steel in place of more expensive steel. For materials for which the quality certificate has been confirmed previously, the inspector can identify them based on timing to determine their accuracy ； However, for materials whose quality certificates have not been verified, it is particularly important to inspect the actual steel plates; spectroscopy can be used to determine whether the actual samples match the information provided in the quality certificates. 5. Material inspectors: The personnel responsible for materials within the manufacturing plant, as well as the material inspectors, should be familiar with the relevant regulations and the standards applicable to steel and welding materials, and should be skilled in using the measuring instruments used for material inspection. The personnel responsible for materials and the material inspectors should not be changed frequently; they are required to have a strong sense of responsibility and integrity.