Trojan Heat Treating Inc.

Southwest Missouri’s heat treating specialist since 1981

Starting at our original facility in Oklahoma, growth and expansion brought us to Joplin, MO which is now our home. We have been serving our clients in the OEM, tool and die, metal fabrication, and gear manufacturing industries.

Material hardening of carbon steel, stainless steel, and tool steels including S7 and D2. Integral quench oven allows processing of parts in work zones up to 36″ x 48″ x 27″.

Our location allows us to offer quick turn-around service to the Four State area of Missouri, Arkansas, Oklahoma and Kansas. Our 30 years of experience in the metal processing industry have developed into repeatable standards in order to meet and maintain our customers high quality requirements. Look to Trojan Heat Treat, Inc for your next metal part hardening needs.

Heat Treating is a process used to alter the physical or chemical properties of a material. The most common application is metallurgical. Heat treatment involves the use of heating or chilling of metal parts to extreme temperatures to achieve a desired result such as hardening or softening of the material. Heat treatment techniques include annealing, case hardening, precipitation strengthening, tempering and quenching. Heating and cooling are done for the specific purpose of altering the physical properties intentionally, but heating and cooling often occur incidentally during other manufacturing processes such as hot forming or welding.

Carbonitriding forms a hard, wear-resistant case. Case depth is tailored to the application and a thicker case increases the wear life of the part. Carbonitriding alters only the top layers of the workpiece and does not significantly alter the dimensions of the part.

Normalizing is an annealing process applied to metals to give the material a uniform grain structure and make it less brittle. It is used on steels to transform austenite into ferrite, pearlite and sorbite. It involves heating the steel to above its upper critical point. It is soaked for a short period at that temperature and then allowed to cool in air. Smaller grains form that produce a tougher, more ductile material. Normalizing improves the capability to machine the component and makes it require less power to cut and easily obtain a good finish.

Case Hardening The process of hardening the surface of a metal object while allowing the metal deeper underneath the surface to remain soft, thus forming a thin layer of harder metal at the surface. Steel or iron with a low carbon content will have poor to no case hardening capability. The case hardening process involves infusing additional carbon into the outer shell. Case hardening is usually done after the part has been formed into its final shape. The term face hardening is also used to describe this technique.

Stress Relieving is done by subjecting metal parts to a temperature below their transformation temperature. This process removes internal stresses. Alloy steels are stress relieved at a high temperature, which after removing the parts from the furnace, the parts are cooled in atmospheric air.