Polymer Quenching - Hardening Heat Treatment

Polymer quenching provides a hardening heat treatment for steel forgings. A polymer quench can be utilized with excellent results on plain carbon & alloy steels that require superior depth of hardness and uniform repeatable mechanical properties. It is particularly useful in forgings that require high impact values in both longitudinal and transverse directions.


ThermTech has a long history of polymer quenching. As quenching is the most critical component of the heat treatment quench and temper process with respect to final mechanical properties ThermTech has made huge investments in our quench systems. All parameters of quenching are controlled, temperature, concentration and agitation. ThermTech has two different polymer concentrations to handle a wide range of alloys and section sizes. Our maximum quench foot print is 120” x 60” x 48” with weights to 10K lbs. 


Polymer quenching is the most critical step in the quench and temper process in regard to final mechanical properties. When properly applied, polymer quenching yields superior results as compared to oil quenching; however all quench variables must be controlled to achieve repeatable results. 

Polymer quenching is particularly useful for quenching high integrity alloy steel forgings that require impact testing. Heavy section AISI 4140 forgings that need good depth of hardness can be a challenge when oil quenched, our polymer quenching hardening heat treatment can be the solution for jobs that do not respond properly to oil quenching.

Atmosphere is an option for polymer quench and tempering if decarburization is of concern.


Polymer quenching is useful over a wide range of steels. From AISI 1045 to AISI 4340 the polymer quenching hardening heat treatment can be the solution for those problem jobs. If quench uniformity is required such as in complying with the CAT 1E106 specification polymer quenching is an excellent choice. Polymer quenching works very well in pre-treatment of components that will be induction hardened where a minimum hardness must be maintained in the transition zone.