Discuss using steel over cast iron

[Jack3M]

Being a scratch builder, I like bare bones. My current forge, which is more convenient than any other I have made is propane fired, thus will not get hot enough, long enough, to melt cast iron or steel. No problem with bronze, brass, or aluminum. Many of the steam engines I mess with declare cast iron cylinders. I could use bronze, but that is spendy with the waste and all.

Is steel going to be too hard to work and for the design? One can get some pretty soft, unhardened steel, that can be heat treated and tempered. Cast iron stock is fairly expensive. Generally under 2" square or round bar would be adequate for my projects.
Thoughts?

 

[WOB]

12L14 leaded steel is soft, machines nicely and is relatively cheap and available. However, it cannot be hardened. It is preferred by many IC engine builders for cylinders when used with cast iron rings. I don't know if it is suitable for steam.
WOB

 

[Jack3M]

Thank you, for steam cylinders I would not want to harden anyhow....

 

[Cogsy]

12L14 rusts almost as you watch it so I'd be hesitant to use it with steam.

 

[Jack3M]

In my research 1215 looks promising. Cast iron rusts very easily too.