 
For a one-stop experience, we can arrange for machining, heat treating, and powder coating services for your casting. We have good relationships with our neighbors who provide machining and powder coating resources allowing us to save you the customer freight charges. For more information on machining, visit EDP Engineering Group Inc. and for more information on powder coating, visit Powder Tech Corporation. |
From ounces to 5,000 pounds
Gray iron is selected for ease of machining, high compressive strength, better thermal conductivity and excellent vibration absorption.
Carbon content is by far the most important element for gray iron (usually 2% to 4%) to create tensile strength and machinability. When molten cast iron solidifies some of the carbon precipitates as graphite, forming tiny, irregular flakes within the crystal structure of the metal which enhances the desirable properties of cast iron, the flakes disrupt the crystal structure leading to cast iron's characteristic brittleness.
| Mechanical Properties |
Class 30 |
Class 35 |
Class 40 |
Class 45 |
Class 50 |
| Tensile Strength (PSI) |
30,000 |
35,000 |
40,000 |
45,000 |
50,000 |
| BHN (Typical) |
170-241 |
187-241 |
187-255 |
196-255 |
196-269 |
Suggested Minimum
Wall Thickness |
3/16" |
3/8" |
1/2" |
5/8" |
3/4" |
From ounces to 3,000 pounds
In ductile iron the graphite forms into spherical nodules rather than flakes, thus inhibiting the creation of cracks and providing the enhanced ductility that gives the alloy its name.
Ductile iron has higher tensile strength and toughness similiar to steel.
| Mechanical Properties |
60-40-18 |
65-45-12 |
80-55-06 |
100-70-03 |
| Tensile Strength (Min PSI) |
60,000 |
65,000 |
80,000 |
100,000 |
| Yield Strength (Min PSI) |
40,000 |
45,000 |
55,000 |
70,000 |
| Minimum Elongation in 2” |
18% |
12% |
6% |
3% |
| BHN (Typical) |
143-187 |
156-217 |
187-255 |
240-302 |
At Dakota Foundry, we can produce both Gray Iron Castings and Ductile Iron Castings in low quantities at a very rapid turnaround.
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