Why to Heat Treat Springs

Heat treatment of springs offers enormous advantages such as improved fatigue life, toughness, and ductility. When heat treating a spring it changes the special properties of the material such as hardness, strength, toughness and elasticity which are some of the key concerns for high-quality spring.

Heat Treatment Process:

All material is not heat treated in same way. Therefore, we first understand the purpose of your application and the environment in which the spring will operate. Then we choose the appropriate process that can be applied to your spring. To attain expected tensile strength, we follow different heat treatment processes.

Heat treatment for some material is given below:

  Inconel X750 Monel K-500

Annealed

   

Heat treatment

2000 -2200o F

1600oF (870o C)

Tensile Strength

130 ksi max

80 – 110 ksi

No.1 Tempered

   

Heat treatment

As supplied condition

 

Tensile Strength

130 – 165 ksi

 

No.1 Tempered + Aged

   

Heat treatment

After spring coiling. Age: 1350°F (732°C) for 16 hours.

 

Tensile Strength

165 – 220 ksi

 

Spring Temper

   

Heat treatment

As supplied condition

As supplied condition

Tensile Strength

160 – 220 ksi

145 – 190 ksi

Spring Temper + Aged

   

Heat treatment

After spring coiling. Age: 1200°F (649°C) for 4 hours.

After spring coiling. Age: 1000°F (540°C) for 10 hours.

Tensile Strength

180 – 250 ksi

160 – 200 ksi

Spring Tempered + Sol + Aged

   

Heat treatment

After spring coiling. Solution heat treat: 2100°F (1149°C) for 2 hours and air cool.

 

Tensile Strength

145 – 190 ksi