This standard specifies the machining allowances and tolerances for ring free forgings. This standard is applicable to ring free forgings with part size 0.2(Dd)≤H≤D.
GB/T 15826.4-1995 history
2008GB/T 21470-2008 Machining allowances and tolerances for steel open die forgings on hammer.Disks,columns,rings and seamless cylindrical sleeves
1995GB/T 15826.4-1995 Machining allowances and tolerances for steel open die forgings on hammer--Rings
GB/T 15826.4-1995 Machining allowances and tolerances for steel open die forgings on hammer--Rings was changed to GB/T 21470-2008 Machining allowances and tolerances for steel open die forgings on hammer.Disks,columns,rings and seamless cylindrical sleeves.