Trooper...
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Didn't realize there was a such thing as soft steel.
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Steel comes in a plethora of formulas... also there are techniques to attain varying levels of "hardness" from the same formula...
Hardness and softness as well as malleability or brittleness are chosen for the widely varying application requirements.
railroad track is much harder than the wheels of the locomotive... the axles of the wheels are much harder than the bushings they ride against.
On a very elementary level... drill or hack saw "cold rolled" material than feel the ease of doing the same task on "hot rolled"
Look at some S.A.E. bolt heads... find one with 3 hash marks and one with 5 or more.... cut these both and you will see the difference in soft and hard steels...
Brent