Table of Contents
What is better ductile iron or cast iron?
Ductile iron has excellent corrosion resistance, tensile strength, and yield strength. Unlike cast iron, ductile iron does not break when it is bent, so it is more suited for high demand applications. Ductile iron is a strong and reliable material for pipes, fittings, and valves.
Is cast steel the same as ductile iron?
While there is no large difference when it comes to tensile strength, ductile iron has the greater yield strength (40 ksi). Cast steel, on the other hand, can only reach 36 ksi yield strength. As the strength of ductile iron increases ductility decreases. Ductile iron has superior shock absorption to steel.
Why is ductile cast iron stronger than cast iron?
The addition of magnesium in ductile iron means that the graphite has a nodular/spherical shape conferring higher strength and ductility as opposed to gray iron which is flake shaped. While gray iron does not have a measurable yield strength, the range for tensile strength is 20,000 psi – 60,000 psi.
Does ductile iron crack?
It has excellent damping qualities, meaning that when intense vibrations disturb the metal, it is unlikely to suffer any damage. However, this alloy has low ductility. Any bending of the material will cause it to crack. Ductile iron is a newer alloy than gray iron.
What is ductile iron used for?
Ductile Iron Applications Ductile iron has greater strength and ductility than gray iron. Those properties allow it to be used effectively in a wide variety of industrial applications, including pipe, automotive components, wheels, gear boxes, pump housings, machine frames for the wind-power industry, and many more.
Is ductile iron strong?
Ductile iron castings are very strong compared to regular cast iron (gray iron). The tensile strength of cast iron is 20,000 – 60,000 psi while ductile iron starts at 60,000 psi and can go to 120,000 psi.
Is ductile iron more corrosion resistant than cast iron?
Ductile Iron offers excellent corrosion resistance that is equivalent to cast iron . The strengths of Ductile Iron and cast steel are comparable . Ductile Iron has a higher minimum yield strength at 40k versus cast steel at 36k .
How do you identify ductile iron?
Ductile iron can be identified in a laboratory setting by using a spectrograph to examine its exact composition, or by using a tensile test.
- Examine the pipe.
- Look for markings on the face of the bell flange.
- Look for markings on the outside of the pipe.
Is ductile iron a type of cast iron?
Ductile iron, also known as ductile cast iron, is a durable, fatigue-resistant metal due to its spherical graphite structure. First patented in 1948, ductile iron is today’s version of cast iron. Like cast iron, modern ductile iron contains small pieces of graphite which slightly change the properties of the iron.
Why is ductile iron used?
What makes iron ductile?
During the smelting process, carbon is added to a molten cast iron bath. More carbon than the iron would normally be able to absorb into the structure is added. This is what makes ductile iron different than steel.
Is ductile iron more expensive than cast iron?
Ductile iron is slightly more expensive than gray iron but is cheaper and easier to cast than steel. It is usually chosen for its mechanical properties and value. As a less brittle alloy than cast iron, it is used in applications where ductility and impact resistance is useful.