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See Chinese contents: GB/T 1239.2-2009 GB/T 1239.2-2009: Cold coiled helical springs technical specifications -- Part 2: Compressions spring
This Document specifies the basic requirements and methods for the classification of forging functions, as well as the technical conditions, process requirements and acceptance basis for various forgings. This Document is applicable to metal free forgings, die forgings and special forgings.
