Re: What's the difference between cast iron and steel ???

Posted by Farmer Tim on October 18, 2001 at 17:45:28 from (64.152.159.228):

In Reply to: What's the difference between cast iron and steel ??? posted by Just Wondering on October 18, 2001 at 06:00:18:

The difference between cast iron and and steel is simple: carbon content. Steel is iron with more than 0% carbon but less than 2% carbon. Most steel contains more than 90% iron and has between 0.15% and 1.0% carbon. Most types of cast iron contain 2% to 6% carbon and small amounts of silicon. Wrought iron contains essentially no carbon. At approximately 6% carbon, it is relatively useless because it is so brittle. In the AISI/SAE numbering system, the last two digits refer to the percentage of carbon in the steel. For instance, 4140, means that the carbon content is .40% . Steel is iron with the carbon in solution. Cast iron is iron in which some of the carbon has precipitated out and appears as flakes ( gray cast iron, the most common ) or little spheres ( nodular ). Gray cast iron is more brittle than steel, and has poor tension strength. However, it is a good material to withstand high compression loads, resist wear, and is easy to machine. Hope to have answered some questions and sorry to get so technical, but I'm a Mechanical Engineer and this is my job...

Follow Ups:

• Re: Re: What's the difference between cast iron and steel ??? How does Nickel play into this 20:35:07 10/19/01 (1)
  • Re: Re: Re: What's the difference between cast iron and steel ??? G Taylor 21:51:26 10/19/01 (0)

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