1 This treatment is particularly useful for hypereutectoid steels that must be machined.

2 In order to detect the carbide network in high carbon hypereutectoid steel wire rods accurately, two kinds of detection method of the carbide network are compared.

3 The globular structure obtained gives improved machinability to the steel. This treatment is particularly useful for hypereutectoid steels that must be machined.

4 The lower heat-treating temperature of the case results from the fact that hypereutectoid steels are normally austenitized for hardening just above the lower critical point.

5 Both steel iron and cast iron have the structures of eutectoid, hypoeutectoid and hypereutectoid.