Welding Cast Steel
14% Manganese steel is often used for its work hardening properties. Dredgers seem to use a lot of it and so do Mixers.
It used to be called Hadfields Manganese Steel after the firm that invented it. Hadfield Steel was in Sheffield where Meadowhall Shopping Mall is now (no comment)
In the as cast state it will have a hardness of around 150Hv but by a little work (hammering or rubbing) that hardness will rapidly increase to 500Hv. So it can be machined to fine tolerances and will still withstand hammering and abrasion.
When welding onto it you must keep it cold. Use E307 weld metal and keep the runs short. You could stand the whole component in water to take the heat away or you can quench the weld in water. Heating this steel (by any means) makes the grains grow and the continue to grow until it loses strength and literally falls apart.