快削性電磁けい素鉄

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Following a study of free-machining magnetic soft iron and magnetic stainless steel, a further study of machinability of practical magnetic silicon steel containing up to about 4% was made by adding Pb, and the underwritten results were confirmed.1. Extension of a tool life, without damaging its original magnetic properties, was possible and high machinability was provided by Pb addition.2. Both the extension result and cracking of chips get somewhat decreased if Si-contents increases.3. Regardless of Pb addition, it was confirmed that the more Si-contents the better magnetic properties, the higher electric resistance and mechanical properties. Soft iron and 1% silicon steel once reach the magnetical optimum value, under around 850°C annealing temperature, but in the high silicon steel with transformation, the higher annealing temperature the better magnetic properties.4. Some mechanical properties, such as wear resistance, was also improved by Pb addition.
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