1/20/2024 0 Comments Heat treating railroad spike knifeI know and have proof that human beings can have an IQ above 180. However, we refer to them as high carbon, they are not within the range of steels known as high carbon or hypereutectoid according to the steel industry standards, and have not been since at least 1926, when most track spikes were previously manufactured from wrought iron." The consequences for the industry would be too great to consider. A bent spike still holds the rail while a fractured spike would not. After all, brittle spikes would not be desirable as a track spike. "Because of the bending tests required, the carbon content will not be greater than 0.30%. When copper is specified, the letters "CU" shall be added."Īdditionally included in a fax to Mike Blue by the gentleman at Wellington industries, a division of Sheffield Steel: Marking: A letter or brand indicating manufacturer and also the letters "HC" indicating high carbon, shall be pressed on the head of each spike while it is being formed. Bending properties: The body of a full size finished spike shall stand being bent cold through 120 degrees around a pin, the diameter of which is not greater than the thickness of the spike without cracking on the outside portion of the bent portion. Carbon not greater than 0.30%, nor greater than 0.20% copper. 2-3: Specifications for high carbon steel track spikes 1968. One thing we can indeed state empirically about diffusion rates: plenty of smiths throughout history have welded steel to iron to make serviceable tools. Complicated stuff! Not the kind of thing about which we should be tossing absolute statements. The diffusion coefficient of carbon in iron is dependent on concentration. Look up "Fick's Second Law of Diffusion" using your favorite search engine. Nobody has defined "medium" yet in this thread. Regarding diffusion rates, (whales migrate, carbon diffuses) "Fast" and "slow" don't have any numbers attached to them. Also, just because one can get 55Rc at 0.30% carbon (or 60Rc at 0.40%) does not mean one will get it. They do change the amount of time you have to get there. To me that seems a little hard to believe in the real world (outside of something like H13, with really high alloy content), which is why I hedged my bets a bit.Īlloying elements other than carbon and boron have no effect on how hard the steel can get. Grant, I've seen a couple charts in different engineering/metallurgy texts that say 0.3% C can reach 54-55 RC.
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