Austenitic weldable steels are often materials that ensure a
formation of acertain amount of delta ferriteinthe weld seam –
usually 5–10% – which prevents cracks and improves the
mechanical properties of the material. On the other hand, the
presence of deltaferrite adversely affects creep strength. Delta
ferrite is formed as singleareason the grainboundaries,butwhen heating exceeds 1340 C,acertain amount of italso occurs inside