Duplex steel is used increasingly in the chemical and petrochemical industries, e. g., for boilers and pipelines. A ferrite deficit in the weld seam area leads to strength reduction, an excess ferrite content to a reduction in toughness and ductility.
In particular when welding duplex steel, the ferrite content in the welding area can easily assume unfavor-able values either due to unsuitable welding filler materials or through poor heat input or heat removal. Only an onsite measurement can provide the assur-ance that the processing did not change the opti-mum ferrite content in an unfavorable manner at the expense of mechanical or corrosion-resistance properties.

Duplex steel is used increasingly in the chemical and petrochemical industries, e. g., for boilers and pipelines. A ferrite deficit in the weld seam area leads to strength reduction, an excess ferrite content to a reduction in toughness and ductility.
In particular when welding duplex steel, the ferrite content in the welding area can easily assume unfavor-able values either due to unsuitable welding filler materials or through poor heat input or heat removal. Only an onsite measurement can provide the assur-ance that the processing did not change the opti-mum ferrite content in an unfavorable manner at the expense of mechanical or corrosion-resistance properties.