Chemical Composition *Carbon and silicon targets are specified for each bar size in order to maintain mechanical properties. Magnesium is added as an inoculant to produce nodular graphite.
| Carbon | 3.45 - 3.75% |
| Silicon | 3.25 - 4.00% |
| Manganese | 0.15 - 0.35% |
| Sulfur | 0.025% Max |
| Phosphorus | 0.05% Max |
Mechanical Properties Brinell hardness values for 4512 HRDS will typically be 167-229. Material hardness is subordinate to chemistry and the silicon level must be maintained in order to achieve elevated temperature properties.
| 01.000 - 20.000 | 25 – 508 | 167 | 229 |
Tensile strength is determined from a longitudinal test specimen taken from the mid-radius.
| Tensile strength psi (min) | 65,000 |
| Yield strength psi (min) | 45,000 |
| Elongation (min)* | 12% |
* In bars under 2.0" diameter, elongation will be 9% minimum.
