However, as a material for a spear or sword that would excel in the bronze or early iron age, or as a tool for the forge the material is far better than mild steel or wrought iron when heat treated properly. ![]() I still do not recommend making knives from this material other than for personal use or novelty purposes. A spike heat treated in this way will still not quite pass the break test, meaning there is plenty of toughness at the full hardness. Additionally, many old koto and earlier swords have ~.4% carbon, which can be hardened to around 60HRC but does not meet the definition of “high carbon steel”…a further note, i did a quick hitatsura (no clay) differential quench on this piece and it gained a fair amount of sori (curvature), which I did not expect from this steel… Toughness?įor most applications it seems the best approach with a spike is to water quench and not temper at all, in order to stay at the maximum hardness for the carbon content. 3% carbon) Hardness?Ī railroad spike with ~.3% carbon can be hardened with a water quench to about a maximum of 55HRC, this is not as hard as most knives, however it is about an axe hardness, much harder than mild steel which maxes out around 40HRC. 6% carbon in high carbon steel (there are “higher carbon” versions of older spikes, but the official specs say they never pass. The goal of this project is to use a material you already have on hand.Ī railroad spike will never be “high carbon steel” as the accepted definition is that there is more than. However as research into the composition and characteristics of railroad spike steel it has raised some interesting points which may lead to further research into koto swords.ĭon’t mess with the railway…if you don’t already have a spike this is not the practice material for you. This project was intended as purely a forging exercise to inspire those wishing to learn hand forging of sunobe and tanto, using a readily available source of scrap steel in a conveniently sized and shaped billet (“forge 10 of these and call me in the morning”). ![]() ![]() Serious students of the forge can watch the full process version here: Hand forging a classical tanto style blade study from a reclaimed railroad spike and a tsuba from the spike head…a serious letter opener? The goal is to use all of the steel efficiently by moving it into place and end up with classical tanto proportions and form.
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