The railway frog made of 1. 14C- 12.72Mn high manganese steel has excellent work- hardening behavior

but it often fails ahead of expected using life because of nose rail spalling during service. It showed by analysis on fracture of railway frog that corrosion- fatigue failure led to surface spalling of frog

and the corrosion- fatigue resistance decreased due to the inclusions of Al₂ O

and Calcium aluminate existed in surface structure and with work hardening the surface high hardness and formed thick and dense slip line band

and with the surface hardness of high manganese steel increased by big mar- gin

the toughness and plasticity of steel obviously decreased led to frog surface spalling. Increasing cleanliness of steel

adding anti- corrosion element Ni and Cu and microalloying of steel are main measures to prevent frog surface spalling.