Should containers made of 15CrMoR be equipped with product test plates?

Depending on the contract requirements, if not specified in the contract, it is not necessary to bring it. The customer can use a spectrometer to determine the material of the equipment themselves.

The head shall be equipped with a base metal test plate, and the welded specimens must meet the requirements specified in the drawings, or in other words, they must comply with the requirements of 150.4-2011, 9.1.1.

It is determined based on thickness, medium toxicity, and heat treatment requirements.

If the customer has specific requests, we will follow those requests; if not, we will proceed according to the standards :)

Here, I would like to thank those who replied above. Among the 5 requirements specified in standard GB150.4-2011, items a), b), c), and e) do not meet the criteria. As for requirement d), which pertains to steel containers whose material properties are improved or restored through heat treatment during the manufacturing process, how should this be defined? What does it mean to improve or restore the properties of materials through heat treatment? For these containers, post-weld stress-relief heat treatment is required, not normalizing treatment; in my opinion this also does not meet the requirements of item d). It is not necessary to include product test plates – only end-cap test plates are needed for these containers. I am not sure if my understanding is correct; I would appreciate guidance from those with more experience

It is not understood in terms of whether it meets the requirements of GB150 9.1d). Refer to GB150.4, clause 8.1.1. This clause also contains five points; if any one of these points is met and the fiber elongation exceeds the requirements specified in Table 4, then heat treatment to restore the material’s properties is necessary. For 15CrMo, normalizing is usually used. Additionally, it’s worth explaining here why such an unclear concept is included in the standards – namely, heat treatment for restoring the mechanical properties of materials. In other words, when a design team selects a material, it also decides on the heat treatment condition under which that material will be used; this could be hot rolling, normalizing, quenching and tempering, normalizing followed by tempering, annealing, and so on. Therefore, the strength and other performance characteristics of the material are also determined based on this heat treatment state. During the manufacturing process, it is inevitable that the material will undergo shaping processes, and these processes more or less disrupt the heat treatment state chosen by the designers, thereby altering the material’s performance properties. The extent of this disruption determines when measures need to be taken, and this is controlled through calculations of the fiber elongation rate. Therefore, if the fiber elongation rate exceeds the standard requirements, it is necessary to restore the material’s properties. If normalized material is chosen for the design, normalization should be used for restoration; if quenched and tempered material is used, quenching and tempering should be employed instead. The type of heat treatment to be used for restoration depends on the original condition of the material upon delivery, and this is why standards cannot specify a definite heat treatment method for restoring material properties.

Thank you. Clause 8.1.1 is understandable; based on these requirements, this device does not fall within the scope. As for heat treatment aimed at improving material properties, the temperature used for stress-relief heat treatment is not high enough to alter the internal structure of the material. Overall, it is not necessary to include a sample piece of the product

Do you mean post-weld heat treatment by stress-relief heat treatment?

Yes. Conventional post-weld heat treatment. 670±20℃

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