CET Carbon Equivalent for Structural Steels
The CET carbon equivalent is a model for calculating the maximum hardness in structural steels. It considers carbon and fast-diffusing elements more accurately than CEV, leading to more precise predictions.
Physicochemical Mechanism of Action
The CET concept calculates hardness in structural steels by considering carbon content and fast-diffusing alloying elements. It uses a special formula to quantify the influence of these elements on hardness.
Metallurgical Relevance & Welding Risks
The CET concept enables a more precise prediction of maximum hardness in the heat-affected zone (HAZ). Too high hardness can lead to cracking and fracture, especially under stress. Therefore, it is crucial to determine the maximum allowable hardness using CET carbon equivalent and ensure it meets the specific requirements of the component.
Workshop Practice & Action Instructions
To apply the CET concept in practice:
1. Determine the carbon content and fast-diffusing elements in the steel.
2. Use the CET formula to calculate the maximum hardness.
3. Compare the result with the specific requirements of the component.
4. Adjust welding parameters (temperature, time) to keep maximum hardness under control.