Abstract
Quenching curves of the test pieces of silver, carbon steel and stainless steel in the 150# spindle oil were investigated, and the effects of quenching were compared. The results are as follows.
The silver method is most accurate, and most suitable of all oils in the comparison of quenching properties. The carbon steel method is practical, but less accurate. By the above two methods the quenching properties only of the surface of the specimen can be measured. However, it is characteristic that by stainless steel method the quenching propeties of the whole body can be measured.
