Iron too heavy for Ulysses but if there was any iron used id imagine it was steel. Can steel go deeper into sun than iron? Compare two bolts.. 1steel 1iron..is there a difference to what the steel can do?
Steel is usually stronger than iron. But steel is, by definition, an alloy of iron and one or more other materials. There are thousands of different steel alloys. Be more specific.
Dont understand are you going to put them in sun ? Sun made from gas wich is on fire. Its impossible to get to the sun and not to get burn. Steel is really more solid and strong than iron so its more hard to break it or to bend. But in camparing of fusion temperature - iron is a bit more better, though it would not make a big difference .From metals - tungsten has the highest fusion temperature - near to 3400 C . Iron is near to 1530 C, steel is near to 1300 -1500 C. So according to this tungsten can go most close to sun. Right near the sun temperature is millions of degrees so anything will fuse and burn there.
