tungsten steel and certain classes of manganese steel are malleable only when red-hot.
Magneto field magnets are always made of tungsten steel alloy, so treated that it will retain its magnetism for lengthy periods.
Where can tungsten, or tungsten steel, be procured, and at what price?
Valves are tungsten steel, 115⁄16′′ inlets and 2′′ exhausts, two of each to each cylinder.
The best practice is to machine the valves from tungsten steel forgings.
Like manganese steel, tungsten steel retains its temper even when heated to high temperatures.