Profile: Nitram Vacuum Heat Treatments Co., Ltd. provides heat treatment service to industry. No salt baths or pollutants are used in vacuum heat treatment, and the process is also environment friendly. By using a vacuum, air and other residual gases are evacuated from the chamber before and during the heating and holding periods which reduces surface oxidization. Items are quenched in neutral gas or oil whilst still under vacuum. Treated items thus suffer less distortion and remain brighter than with traditional heat treatments. Vacuum heat treatment also results in better ductility of the materials at the same hardness level.