Whoever said that there is no such thing as cast steel is smoking crack. Cast steel is just a steel that has been cast....The difference between cast iron and cast steel is that they are both iron alloys but cast iron has a greater carbon content which gives it a lower melting temperature and easier to cast. The "cast" is just the process not the material though "cast iron" does refer to a specific group of alloys with high carbon content......More carbon= more brittle as a rule so cast steel is less brittle and generally stronger for the things we use it for. Cast steel is a iron alloy with a very low carbon content. In other words it's just steel that has been cast.....Forging or machining process has nothing to do with any of this............
The high steer arm issue on your Toy is nearly the same issue of other high steer setups..44..60...The difference is on the Toy the surface area of the arm to knuckle contact is very small on a Toy. By design these all rely on friction for strength. The studs aren't supposed to see any sheer stress but when the nuts come loose the friction is gone and sheer is all that's left. The sheer strength of the studs isn't enough and will soon fail. Add enough studs though and they have much better sheer strength.....On the small surface Toy there isn't enough friction even with the studs to proper torque so it's doomed form the start if you stress it much over stock application........