| 摘要 |
Wire rod is subjected to a cooling operation while emerging from a hot rolling mill. The rod is first cooled to a temperature of 850≦̸ to 650≦̸C and is then kept at substantially this temperature for a time sufficient for austenite to be transformed into ferrite. The rod is then cooled to a temperature of 625≦̸ to 400≦̸C and is kept at substantially this temperature, or allowed to cool slowly, for a time not shorter than 15 seconds and sufficiently long to permit precipitation of carbon in the form of carbides.
|
