What markings should be on seamless steel pipes?
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What markings should be on seamless steel pipes?
The markings on seamless steel pipes usually include the following aspects: 1. **Manufacturer’s name or trademark**: indicates the producer. 2. **Product specifications**: such as outer diameter, wall thickness, etc. 3. **Material grade**: Indicates the steel grade of the pipe, such as API 5L X52, A106B, etc. 4. **Production Batch Number**: To facilitate tracking of the product’s production batch. 5. **Standard Number**: The standard to which it complies, such as API, ASTM, etc. 6. **Production Date**: Indicate the date of manufacture. 7. **Other certification marks**: such as the CE mark, ISO certification, etc. This information is usually displayed on the surface of the steel pipe by spraying paint, printing, or attaching labels. .
Refer to Section 6.2 on markings in GB/T 2102-2022.
I read an article online about a refining company in western China that purchased a batch of ordinary No. 20 steel pipes during construction, with handwritten markings on their surfaces. The supervision unit believes that, in accordance with domestic GB and SH standards, it should be considered a defective product. The three authors are members of the procurement departments of the construction units; they believe that just because the standards do not specify anything, it is acceptable to use handwritten labels instead. Several pages are devoted to explaining this issue, and I think this construction project is quite dangerous. What kind of quality can be expected from manufacturers that use handwritten labels? What’s your opinion?