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See Chinese contents: GB/T 24524-2021 GB/T 24524-2021: Metallic materials -- Sheet and strip -- Hole expanding test
This Document specifies the principles, test equipment, specimens, test procedures, calculation of test results and test reports of the test method for hole expanding of metal sheets and strips. This Document is applicable to the determination of the limiting hole expansion ratio of metal sheets and strips with a thickness of 1.2mm~7.0mm and a width of no less than 90mm.
