Can a stainless steel flange be used if it doesn’t have a stamp?
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Can a stainless steel flange be used if it doesn’t have a stamp marked on it? Does that mean its quality is substandard?
In terms of material alone, spectral analysis can be performed to determine the content of major alloying elements, in order to assess whether the material meets the required standards.
The lack of a stamp simply means it is not a product from an official manufacturer!
Is it necessary to specify stamping requirements in the technical specifications or supply contract, or is it something that is simply part of standard practice?
A material tester is used to determine the material, the thickness of the flange, the type and width of the sealing surface, as well as the diameter, quantity, and spacing of the bolt holes. .
It depends on where it will be used; it can be used for ordinary pipes (that are not subject to high temperatures, high pressures, or are flammable/explosive).
Unless flanges with very small diameters cannot be fully welded, all others need to be welded
In accordance with GB50235-2010 \"Code for Construction of Industrial Metal Piping Projects\", 4.1.2 states that before use, piping components and materials must have their material composition, specifications, models, quantities, and markings verified in line with **current relevant standards and design documents. Additionally, inspections must be carried out on their visual quality and geometric dimensions, and the results must meet the requirements specified in the design documents and corresponding product standards. The identification of pipeline components and materials shall be clear and complete, and shall be traceable to the product quality certification documents. 4.1.3 When there are objections to the performance data or test results of pipeline components or materials, such components or materials shall not be used until the objections are resolved. The identification of pipeline components and materials shall be clear and complete, and shall be traceable to the product quality certification documents. Even when there are markings, inspection is still required; without any markings, how can tracing be done? For flanges in metallurgy, I would advise caution when using them; perhaps they can be used temporarily in low-pressure water systems.
In my opinion, as long as a qualified written quality inspection report is provided, the flanges can be used whether or not they have steel stamps.
Stamping is required; this is well understood in large manufacturing plants. In the case of bulk purchases, it needs to be specified in the technical attachments
Relevant provisions are available in **all standards, whether they are GB, JB, HG standards, or others. If it doesn’t function, then it is an inferior product.