Sulfur binding by manganese

Manganese binds sulfur in the melt and forms manganese sulfides, which prevent hot shortness. Too much manganese, however, can lead to increased hardness and lower toughness.

Physical-Chemical Mechanism of Action

Manganese reacts with sulfur in the molten pool to form stable manganese sulfides. This prevents the formation of sulfur-rich compounds that could cause hot shortness.

Metallurgical Relevance & Welding Risks

Too much manganese can cause increased hardness and lower toughness. This can lead to hot cracks and low impact strength in the weld. Plus, an improper manganese level can mess up the structure's deformation behavior.

Workshop Practice & Action Instructions

Use manganese in the desired amount as an alloy addition to improve sulfur binding. Keep the manganese content from exceeding 1.5 % to maintain toughness and flexibility of the structure.

MetallurgieSchweißtechnik