Carbon Equivalent Formula
The carbon equivalent formula gives a value that estimates a steel's hardenability and weldability. It takes into account the carbon content and other alloying elements like silicon or chromium.
Physical-Chemical Mechanism of Action
The carbon equivalent formula calculates a value that estimates a steel's hardenability and weldability. It considers the carbon content and other alloying elements like silicon or chromium. This formula helps predict if a steel will get too hard and become tough to weld.
Metallurgical Relevance & Welding Risks
A carbon equivalent that's too high can cause strong hardening of the structure. This increases hardness but also the risk of cracking and hot cracking. If the welding process isn't right, the steel might be too hard to deform, leading to weld failures.
Shop Practice & Action Points
Before welding a steel, calculate the carbon equivalent. For low-alloy steels (e.g., 1020), the CE is usually under 0.75%, which is good for welding. For high-alloy steels (e.g., 4340), the CE can be over 1.0%, so you need a more careful welding procedure. With high carbon equivalent, it's key to cool the weld slowly and under control to avoid cracks.