Tensile and Yield Strength — There are certainly differences when it comes to tensile and yield strength of gray and ductile iron. Ductile iron has a minimum tensile strength of 60, psi and a minimum yield strength of 40, psi. While gray iron does not have a measurable yield strength, the range for tensile strength is 20, psi — 60, psi. Impact — Ductile iron has a greater resistance to impacts, and is able to resist a minimum of 7 foot pounds of impact versus 2 pounds of impact for gray iron.
Thermal Conductivity — Ductile iron has a lower thermal conductivity than gray iron. Vibration Dampening — Gray iron dampens vibrations more effectively than ductile iron. It is typically used in the following non-critical applications where strength is not the main required property: Manhole covers Counter weights Machinery bases for vibration dampening Ductile Iron, because of the increased strength and ductility is used in more engineered applications: Cable drums Frames Gear boxes Pumps We have included a chart comparing the two irons across a variety of factors.
Social Media. Major differences between these two metals include their carbon content, formation, advantages, disadvantages and functions. Malleable iron contains 0.
Cast iron, in comparison contains much more carbon than malleable iron. Its percentage of carbon content ranges from 2 percent to 4. The process of making malleable iron begins with making white cast iron, which is made by cooling cast iron quickly, preventing the formation of graphite flakes.
The white cast iron is heated for several long periods with certain materials. During these periods the carbon content of the iron decomposes and starts to leave the metal, while some of it turns into particles of graphite. Due to it losing volume more liquid metal must be added to prevent breaks. The result of this process is malleable iron. Cast iron can be made in a bloomery furnace. Malleable iron considerably shrinks when solidifying, but ductile iron does not. This means that ductile does not require as many specialized workers or equipment to mold as its predecessor.
Unless your application is severe, you probably would not even notice the difference between these products. Ductile iron wins in this comparison, but malleable iron is still a great material used for fittings and other equipment to this day. We even carry a very popular line of black malleable iron fittings for gas lines. If you can't find what you need, visit our customer support section. All Rights Reserved. Terms of Use Privacy Policy. JavaScript seem to be disabled in your browser.
You must have JavaScript enabled in your browser to utilize the functionality of this website. You have no items in your shopping cart. PVC Fittings Online. Account Log In Sign Up. Water Wells. Mixing Valves Pressure Reducing Valves. Stop Valves. Supply Lines. Outlet Boxes. Therefore, it is used for various things like pipes, the automotive industry, i. Other machines are also made from Cast iron. Iron Casting has been a job for ages. Various types of iron are being produced through this process and are used to make several machines and products in return.
Ductile Iron and Cast Iron are the two most common iron types in the market today. Both these types of iron cater to different needs. Ductile iron can be bent way more easily than Cast iron. It is also less brittle and has better flexibility. However, Cast iron does a better job at machinability, capability and resisting capacity. Cast iron is resistant to Oxidation. Even Ductile iron is a type of Cast iron, which has some advantages over the previously discovered varieties of Cast iron.
It is very similar to Malleable Cast iron. The only difference is that Ductile iron provides the same features at a lower price.
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