Why Don't Engines Use More Steel?

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SUMMARY

Engines predominantly utilize materials such as iron, aluminum, titanium, and magnesium due to their superior weight-to-strength ratios and ease of machining compared to steel. Steel's heavier weight and susceptibility to rust make it less favorable for engine components. Additionally, iron is preferred for casting and forging processes, providing better performance characteristics. The noise produced by steel blocks further detracts from their suitability for family vehicles.

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Are there any reasons why engines tend to use iron, aluminum, titanium (connecting rods), and even magnesium (engine blocks) components while steel is far less common?
 
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I think it has to do with weight.

Steel weighs a lot more and has more rust issues than than the other materials.

I found this discussion on it:

http://weldingweb.com/showthread.php?38358-Building-an-engine-block-from-plate-steel

It seems the bottom line is the difficulty of machining it to the tolerances you need so it may boil down to steel is harder to work with and maintain.
 
Because for a lot of reasons iron is a better metal to cast and forge if needed then steel. Also anyone that has heard an engine with a steel block knows the noise it makes doesn't suit the family car.
 

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