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That's not a test for any particular alloy at all, only a rough guide to two metals' relative hardnesses.
Mild-steel cannot be hardened through, only case-hardened to give a thin, wear-resistant surface layer. Heat-treatable steels can be hardened through but hardness alone merely tells you it has been hardened, and may simply be high-carbon steel (Iron plus a small amount of carbon).
If you know the metal in a particular machine can only be either untreated mild-steel or Chromoloy, then hardness will differentiate them; but if you don't know what alloys have been used, it tells you only which components have been hardened, and could be any of two or more such alloys in the machine.
As for using a file as a hardness-tester.... Not with any file belonging to me or anyone else who respects their tools, you don't!
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SteveYou can check if a material is chromoly by looking for markings or codes on the metal itself. Chromoly steel typically has markings such as "4130" or "25CrMo4" identifying it as chromoly. Additionally, chromoly is known for being strong and lightweight, so its properties can also help you determine if a material is chromoly.
When I raced Motocross we used to check with a file, Chromoly is a tempered steel and the file would rub over it with very little shavings as oppose to mild steel,it would be like sliding your foot on dirt, (mild steel) and sliding your foot on ice, (chromoly). Answer Not sure but the the link below may help.
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What is the chemical equation for chromoly steel?
Steel hasn't a chemical equation.
Is chromoly steel light?
Chromoly steel is relatively lighter compared to other types of steel. It is known for its high strength-to-weight ratio, making it a popular choice for applications where both strength and weight are important considerations, such as in bicycle frames or roll cages for race cars.
What is the fastest bmx?
The fastest BMX bike available typically has a high-tensile steel or chromoly frame, lightweight components, aerodynamic design, and thin, low-profile tires to reduce rolling resistance. However, speed can also be affected by the rider's skill and strength.
Is aluminium as strong as steel?
It depends on multiple factors, There are multiple grades/alloys of both that have different characteristics ( flexibility, temperature ranges, chemical resistance that affect it's strength). If you are going by volume, comparing pieces of the same width/length/thickness, than steel is always stronger. If your comparing by weight, comparing 2 pieces that weight the same, than aluminum is almost always stronger with the exception of chromoly steel. 41xx grade chromoly steel is the only steel that is stronger/weight than aluminum alloys(debatable), but most agree that the aluminum of similar weight will be stiffer. Aluminum alloys usually show a 1/3 weight saving with equal strength vs. non Chromoly steels, like that used in production cars. All commercial planes are made of aluminum alloy.
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