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 | 3.00% Max |
| Silicon | 1.00 - 2.80% |
| Manganese | 0.50 - 1.50% |
| Nickel | 13.50 - 17.50% Max |
| Copper | 5.50 - 7.50% |
| Chromium | 1.50 - 2.50% |
| Sulfur | 0.12% 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. BHN in the center of bars 1.750" and smaller may be lower than the values shown because of thermal center microshrinkage.
| 01.000 - 06.000 | 25 – 152 | 131 | 183 |
The tensile strength will be approximately 25,000 psi for bars up to 3.00" diameter and 20,000 psi for bars larger than 3.00". Tensile strength tests in bars 1.750" and smaller may not be accurate because of thermal center microshrinkage.
