60-40-18 Ductile Iron
Dura-Bar 60-40-18 is a nodular iron with a fully ferritic matrix. This iron grade’s microstructure is achieved through annealing and offers excellent ductility and impact strength. Dura-Bar 60-40-18 has the most ductility out of the ductile iron family of Dura-Bar. Annealed Dura-Bar is NACE compliant, ASTM A395, and ASTM A536. To learn more, download the 60-40-18 Ductile Iron Product Brief.
Microstructure
The microstructure consists of Types I & II nodular graphite as defined in ASTM A247. The matrix is 100% ferrite. The edge or rim will have a higher nodular count. Chill carbides will be less than 5% in any field at 100x and will be well dispersed.
Center Area
100x, etched in 5% Nital
Edge Area
100x, etched in 5% Nital
Sizes
Dura-Bar Ductile 60-40-18 is a non-stock grade, which can be ordered in volume quantities from our distributors.
Technical Specifications
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.
| Element | Percentage |
|---|---|
| Carbon | 3.50–3.90% |
| Silicon | 2.25–3.00% |
| Manganese | 0.15–0.35% |
| Sulfur | 0.025% Max |
| Phosphorus | 0.05% Max |
Mechanical Properties
Hardness properties are shown in the table below. Hardness properties listed are minimum and maximum across the bar. For rectangles, squares and shapes, the hardness properties will depend on minimum and maximum section thickness and will be supplied on request.
| Size Range | BHN | ||
|---|---|---|---|
| Inches | mm | Min | Max |
| 1.000–20.000 | 64–508 | 143 | 187 |
Tensile strength is determined from a longitudinal test specimen taken from the mid-radius of the as-cast bar.
| Mechanical Properties | |
|---|---|
| Tensile strength psi (min) | 60,000 |
| Yield strength psi (min) | 40,000 |
| Elongation (min) | 18% |