Chemical Composition *Carbon and silicon targets are specified for each bar size in order to control the size and shape of the graphite flake. Titanium is added as an inoculant in order to produce the Type D graphite structure.
| Carbon | 2.60 - 3.75% |
| Silicon | 2.30 - 3.00% |
| Manganese | 0.10 - 0.35% |
| Sulfur | 0.025% Max |
| Phosphorus | 0.10% Max |
Mechanical Properties Brinell hardness values for nominal as-cast diameters are shown in the table. Hardness properties listed are minimum, maximum across the bar. Hardness values for rectangles and squares are a function of the height and width ratios and will be supplied on request.
| 01.000 - 01.500 | 25 – 38 | 159 | 229 |
| 01.501 - 03.000 | 38 – 76 | 156 | 201 |
| 03.001 – 07.000 | 76 – 178 | 143 | 201 |
The tensile strength will be approximately 25,000 psi, as determined from a longitudinal test specimen taken from mid-radius of the as-cast bar. The tensile data is not a minimum, but rather the typical expected tensile strength. Anticipated tensile data for shapes, including squares and rectangles, will be provided on request.
