The brittleness of high-manganese steel under low temperature is discussed. A method of Iow-temperature cutting with liquid nitrogen freezing of the workpiece has been developed.
论述了高锰钢的低温脆性，建立了用液氮冷冻工件的低温切削方法。
2
The cooling medium, or coolant, in them is either water or some low-freezingliquid, called antifreeze.