If the spikes fail to meet the third test, they shall be rejected.Ģ.2.9 PERMISSIBLE VARIATIONS IN DIMENSIONS (1968) Spikes represented by bend tests failing to meet the requirements prescribed in Article 2.2.6a and Article 2.2.6b may be annealed and resubmitted.
#BEST RAILROAD SPIKE KNIFE TUTORIAL MANUAL#
One bend test of each kind specified in Article 2.2.6a and Article 2.2.6b shall be made from each lot of 5 tons or fraction thereof.ĥ-2-6 AREMA Manual for Railway Engineering
When the option in Article 2.2.5 is exercised, one tension test shall be made from each 10-ton lot or fraction thereof.ī. But no, it won't get as hard as another bit of steel with 30 points.Ī. Or look in chapter 6 of Principles of Heat Treatment of Steel by Krauss for a very good graph.Ī spike or other bit of steel with 20 points of carbon can indeed be hardened. Retained austenite can actually diminish maximum attainable hardness at carbon levels beyond this.) Run an internet image search with the terms "carbon" and "hardness" and a few renditions of this graph will show up. Maximum attainable hardness levels out around 60 or 65 points. The more carbon available, the more martensite which can be formed. The maximum attainable hardness of a given piece of steel versus the carbon content forms a curve on the graph. There is no magic number above which steel will harden or below which it will not. No disrespect meant to a fellow electrician, but I'm going to get nitpicky here.
No you cant HT a spike, sorry read about heat treating and you will understand that one needs at least 35 points of carbon to harden a steel
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