Atmosphere Heat Treating of Worm Gears & Rope Grips for Service Elevators

In 1995, Mid-South Metallurgical partnered with engineers from a major elevator manufacturer to develop an atmosphere heat treating carburize and hardening process. Still in use today, this process is essential in supporting the ASME A17.1 Safety Code for Elevators and Escalators guidelines. The carburize and hardening process provides the necessary engineering properties for this critical application. Careful fixturing and handling insure minimal distortion during the heat treating process.

The heating range is from 1,550 degrees Fahrenheit (F) to 1,725 degrees F, and the material used is 8620 to form these worm gears. The effective case depth ranged from .020 to .050 inches and we maintain a +/- .005" tolerance during straightening. The processes used meet ISO 9001:2008 standards.