Xiaobai is seeking help regarding pipe fitting standards; please experts provide an answer, thank you!
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Our factory purchased a batch of 90° long-radius elbows made of SUS304 with dimensions of Φ76*4. No specific standard requirements were specified at the time of ordering. Some of the items that arrived are shown in the pictures; the standard applied here is GB/T12459-90. The weight and wall thickness of these elbows are lower than those specified by the GB/T12459-05 standard. I have never seen this standard before, nor can I find any information regarding it. Could anyone who is aware of it please provide some guidance?
It has been checked; it’s the 1990 standard, old stock...