| Dura-Bar G2A has Type D graphite in a predominantly pearlitic matrix. The fine graphite structure allows excellent surface finish and is normally used in permanent mold applications requiring optimal strengths and wear resistance. The microstructure will contain Type VII, type D, size 6-8, graphite as defined in ASTM A247. The matrix is predominantly pearlite. The rim will be similar to the center. Chill carbides will be less than 5% in any field at 100x and will be well dispersed. G2A Dura-Bar can be oil quench hardened from 1600F (870C) to a minimum hardness of 50 Rc on the outside of the bar. The inside diameter hardness will be less than 50 Rc. Lower quench hardnesses on the inside diameters are a result of larger graphite flakes and not a loss of matrix hardness. Composition: Typical chemical composition and ranges, actual values depend on cross section size. Information provided by Dura-Bar. |
