Manganese-to-sulfur ratio

Physical-chemical mechanism of action

Manganese reacts with sulfur and forms manganese sulfides, which stabilize the material and improve its mechanical properties. An uneven ratio can cause sulfur segregations or cracks.

Metallurgical relevance & risks when welding

Too low a manganese-to-sulfur ratio can lead to sulfur segregations and cracks during hot forming. Too high a ratio can contaminate the material and reduce its toughness.

Workshop practice & instructions

Make sure the manganese-to-sulfur ratio is in the optimal range (usually between 0.5% and 1%). Check the additions in a melt sample and, if needed, adjust the manganese or sulfur content.