12 responses

  1. Okafor Mercillenus
    July 1, 2013

    it concerning all the elements especially cast iron and steel


  2. Okafor Mercillenus
    July 1, 2013

    it concerning all the elements especially cast iron and steel . steel is fabricate by having different shape,it have 2percentage while cast iron have 4percentage


  3. Tom
    December 18, 2013

    The last statement in the third paragraph is wrong, “If compared with cast iron, steel is superior in tension, and does not rust.”
    Steel rusts, too, my 1974 Subaru or any Honda car from that time frame is testament, and in some conditions steel rusts more.
    “Cast iron and steel corrode; however, because of the free graphite content of cast iron (3% – 4% by weight or about 10% by volume), an insoluble graphitic layer of corrosion products is left behind in the process of corrosion. These corrosion products are very dense, adherent, have considerable strength, and form a barrier against further corrosion. Because of the absence of free graphite in steel, the corrosion products have little or no strength or adherence and flake off as they are formed, thus presenting fresh surfaces for further corrosion.” from CISPI – corrosion resistance.


  4. Kapil Martolia
    October 9, 2014

    Steel contains <2% carbon and cast iron contain 2 to 6.67% carbon


  5. Douglas Thomas
    October 10, 2015

    I hate to say it, but I stopped reading after the first sentence was factually wrong. Iron is not the heavest element found on earth, not by a long shot. Silver, Lead, Mercury, Uranium, Gold are all denser and heavier, and those are just the well know ones.


    • Peter Mirtitsch
      November 8, 2017

      Except you don’t find elemental Uranium on Earth, but you do find elemental Iron…


      • Hyram
        September 23, 2018

        Hi. I know this is an old post, but I felt the need to add a few things just to potentially help those that may come across this looking for answers. First of all, responding to your comment Peter, we absolutely do find Uranium on Earth. It’s literally the only place we’ve ever mined it (since humans have never mined anywhere else). More to the point, even the more common elements that Douglas listed are in fact all heavier than iron (gold being over twice as heavy as iron). To name a few more elements that are heavier and more dense than iron: platinum, palladium, plutonium, tungsten (all of which are found on earth, btw) even nickel and cobalt are more dense than iron. And there is a laundry list more. And all this is only in response to the first sentence of the article. Others here have commented on numerous other inaccuracies in this post. I’m not commenting to make anyone feel bad and i’m not trying to be a bully, but for those that may reach this looking for legitimate answers, they should know that this article is in no way accurate.


  6. Matthew Hogue
    November 22, 2016

    I admire your attempt but this article is so inaccurate.

    I’m a professional welder, certified machinist, and hobby foundry worker.

    Iron has a much higher melting point than steel! 2800f for iron, 2200 for steel.

    Some steel is mild, but there is also high carbon and corrosion resistant steel, as well as various super alloy.

    A lot of stainless steel has NO iron in it. Depending on the alloy, it may be replaced by nickel. (test it with a magnet)

    As has been stated, iron is far from the densest elemental metal.

    Engine heads are made from aluminum.

    Cast iron is actually rather soft(do the file test). If it was harder than steel, it would be used for blades. The structure is what makes it brittle, and a total nightmare to machine.

    Modern wrought iron, is mild steel.


    • Batite
      March 30, 2018

      Not all engine heads are made of aluminum. I have three from 1991 to 2004 and all three have cast iron heads.


    • Amal
      September 4, 2018

      Thanks for your comments


  7. anonymusly
    December 4, 2016

    what the hell guys are you saying like that…..actually i think you all are not related to science and doing all bullshit things like that.
    first of all i would like to say you all that steel is more tougher and stronger then cast iron and steel will not rust whenever cast iron makes corrosion reaction with time.


  8. Rosco4WD
    May 8, 2017

    Statement like ” Iron is a hard grey metal, and heavier than any of the other elements found on Earth.” is just plain wrong and makes the author a “NonExpert” ..not worth reading any further. I think he failed Chemistry 101

    Density of Fe is 7.876 g/ cubic cm. Lead Pb is 11.34, Gold Au is 19.32

    This makes the same size billot of Au over double the weight of Fe .


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