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Dura Bar Metal Services
Dura-Bar G1A offered by Dura-Bar Metal Services #

Ferritic Gray Iron G1A

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.


Depiction of Dura-Bar microstructure

100x, etched in 5% Nitol Center view of Dura-Bar G1A microstructure

100x, etched in 5% Nitol Edge view of Dura-Bar G1A microstructure

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.

Chemical Composition of Gray Cast Iron
C% Si% Mn% S% P%
2.60-3.75 2.30-3.00 0.10-.035 0.025 max 0.12 max

Typical Uses

Glass Mold:
Blank Molds, Plungers

Grade Properties Gray Cast Iron

Mechanical: G1A
Tensile Strength (psi) 25,000
Yield Strength (psi) N/A
Elongation (%) N/A
Machinabilty Rating (1212=100%) N/A
Hardness (BHN) (AVG) 186
Relative Wear Resistance N/A
Heat-Treat Response (Rc) N/A
Machining Guidelines: G1A
Machining Operation Maching Speed (sfm) Feed (ipr) Depth of Cut (inches)
Rough Turn (OD & ID) Contact Dura-Bar Metal Services
Finish Turn (OD & ID)
Drilling/Milling (indexable)
(solid carbide)