This part of JB/T 5110 specifies the structural type and size, materials, requirements and markings of the steel die base for forging dies of screw presses. This section applies to the cast steel die base of the forging dies of screw presses.
1991JB/T 5110.3-1991 Screw press die Technical conditions for die blocks
JB/T 5110.3-2015 Screw press forging dies.Components.Part 3: Die holders has been changed from JB/T 5110.4-1992 Screw press die Die base used for round die blocks.