Stress Relieving and Annealing
PGI can provide you with stress relieving and annealing for steel burnouts, castings and fabrications to remove the inherent stress properties. Stress relieving and annealing also improves the part’s machinability and promotes higher flatness standards.
Stress Relieving – Soak temperature 1100-1200˚
Stress Relieving is a heat treating process that consists of heating the steel to a temperature below the critical range to relieve the residual stresses resulting from hot rolling, welding, shearing, or gas cutting. Stress relieving does not change the material properties as does annealing and normalizing.
Sub-critical Annealing – Soak temperature 1350-1450˚
Sub-critical annealing is a relatively low temperature heat treating process used to reduce hardness and increase ductility. The sub-critical annealing process improves machinability and reduces stress, to decrease the likelihood of cracking during cold working operations.
Full Annealing – Soak temperature 1500-1650˚
Annealing is a heating process that alters the physical and sometimes chemical properties of a material to increase its ductility and to make it more workable. It involves heating a material to above its recrystallization temperature, maintaining a suitable temperature, and then cooling. Annealing can induce ductility, soften material, relieve internal stresses, refine the structure by making it homogeneous, and improve cold working properties.
We can also apply special heats per customer requirements.
In addition to in-house stress relieving and annealing, PGI also offers heat treating, flame hardening, and other types of services through our partners.
*Heat charts are available upon request.
Stress Relieving & Annealing Frequently Asked Questions