Bending cast iron

When the part is straighten, let it cool, then reheat to a dull red and quinch in oil. This adds a small amount of temper to the steel. If you try and quinch without the cool down the part will become brittle and crack.

Take your time and let the metal tell you what it needs. Place the pipe edge at the spot that needs to bend and the part will bend in that spot. If it doesn't bend easy then you need more heat or a different leverage point.

Sometimes the part will tear because it fractured when it bent. In this case just continue to straighten the parts and weld back together, then temper.

T_Bone

David,
Since your steering part bent without breaking, It probably isn't cast iron at all. Malleable iron looks the same, but it can be forged, bent, slightly drawn, and welded. Your risk from heating red and bending isn't as bad as you might think...even if you break it, it can be welded.

You can do a simple test to see if it is malleable. File a spot to see what color the metal is. Malleable iron will look like steel. Cast iron will be grey.

The photo is of a Cub steering arm that was heated and bent a LOT. It was found to be too long for the new job, so it was shortened by removing a piece and welding.
George Willer