Dura-Bar G1A contains Type D graphite in a predominantly ferrite matrix. This specification was originally developed for the glass mold industry where a fine grain structure and superior machining finish are needed. Dimensional growth due to repeated heating and cooling cycles is minimal due to the smaller graphite flake and size and ferritic matrix structure.
The microstructure will contain Type VII, size 6-8 graphite as defined in ASTM A247. The matrix is predominantly ferrite. Chill carbides will be less than 5% in any field at 100x and will be well dispersed.
|2.60-3.75||2.30-3.00||0.10-.035||0.025 max||0.12 max|
- Glass Mold:
- Blank Molds, Plungers
Grade Properties Gray Cast Iron
|Tensile Strength (psi)||25,000|
|Yield Strength (psi)||N/A|
|Machinabilty Rating (1212=100%)||N/A|
|Hardness (BHN) (AVG)||186|
|Relative Wear Resistance||N/A|
|Heat-Treat Response (Rc)||N/A|
|Feed (ipr)||Depth of
|Rough Turn (OD & ID)||Contact Dura-Bar Metal Services|
|Finish Turn (OD & ID)|
|Grooving (OD & ID)|