Chemical Composition *Carbon and silicon targets are specified for each bar size in order to control the size and shape of the graphite flake.
| Carbon | 2.60 - 3.75% |
| Silicon | 1.80 - 3.00% |
| Manganese | 0.30 - 0.65% |
| Sulfur | 0.07% Max |
| Phosphorus | 0.12% Max |
Mechanical Properties Brinell hardness values for nominal as-cast diameters are shown in the table. Hardness properties listed are minimum and maximum across the bar. Hardness values for rectangles and shapes are a function of the height and width ratios and will be supplied on request.
| 00.625 - 01.500 | 16 – 38 | 179 | 235 |
| 01.501 - 03.000 | 38 – 76 | 163 | 229 |
| 03.001 - 06.000 | 76 – 152 | 151 | 229 |
| 06.001 - 20.000 | 152 – 508 | 143 | 201 |
The tensile strength of this material will be lower than the strengths in G2. Smaller bars will be approximately 30,000 psi; larger bars will be 20,000 psi. This grade is most commonly used in applications with applied loads less than 15,000 psi.
