Solution Strengthened Ductile IronSSDI
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Solution Strengthened Ductile IronSSDI
Overview
Dura-Bar SSDI is a grade of ductile iron that combines the elevated mechanical strengths of a pearlitic ductile iron with the machinability advantages of a ferritic ductile iron. By combining the best of both desired properties, Dura-Bar SSDI is an attractive grade of ductile iron that provides several benefits towards designing and manufacturing of metal components. Download the SSDI Product Brief or the SSDI Sales Flyer to learn more.
Microstructure
The microstructure consists of Types I & II nodular graphite. Microstructure attributes can be summarized as 85% nodularity. Pearlite percentage for the center and edge of the bar is 5–30% and 0–15%, respectively.
Center Area
100x, etched in 5% Nital
Edge Area
100x, etched in 5% Nital
Heat Treat Response
Initial test results prove Dura-Bar SSDI can be oil quench hardened from 1650° F (898° C) to a hardness Rockwell C 35–40. From these tests, it can be concluded that there is an overall uniformity and consistency. When untreated, SSDI’s microstructure is primarily ferritic, however when heat treated, the microstructure changes and becomes martensitic.
Sizes
Dura-Bar Ductile Iron SSDI 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 | 3.20–3.75% |
| Silicon | 3.25–4.00% |
| Manganese | 0.15–0.35% |
| Sulfur | 0.025% Max |
| Phosphorus | 0.05% Max |
Mechanical Properties
Hardness properties for various diameters are shown in the table. 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 | 25–508 | 167 | 229 |
Tensile strength is determined from a longitudinal test specimen take from mid-radius of the as-cast bar.
| Mechanical Properties | |
|---|---|
| Tensile strength psi (min) | 75,000 |
| Yield strength psi (min) | 55,000 |
| Elongation (min) | 15% |